WO2020091493A1

WO2020091493A1 - Method and device for configuring resource pool for sidelink in nr system

Info

Publication number: WO2020091493A1
Application number: PCT/KR2019/014676
Authority: WO
Inventors: 윤성준
Original assignee: 주식회사 아이티엘
Priority date: 2018-11-02
Filing date: 2019-11-01
Publication date: 2020-05-07
Also published as: KR102704233B1; KR20200050821A

Abstract

The present invention may provide a method for configuring a resource pool by means of a base station in an NR system. The method for configuring a resource pool by means of a base station may comprise: a step of determining, on the basis of a slot configuration period of a TDD UL-DL setting, a first period corresponding to one bit in a first bitmap; a step of indicating resource pool candidates via the first bitmap on the basis of the first period; and a step of indicating resource pools in each of the resource pool candidates via a second bitmap.

Description

Method and apparatus for configuring resource pool for sidelink in NR system

The present invention relates to a method and apparatus for configuring a resource pool for a sidelink in a New Radio (NR) system. More specifically, the present invention relates to a method and apparatus for configuring a resource pool for a side link in consideration of Time Division Duplex (TDD) in an NR system.

The International Telecommunication Union (ITU) is developing the International Mobile Telecommunication (IMT) framework and standards, and is currently in the process of discussing 5G (5G) communication through a program called "IMT for 2020 and beyond." .

In order to meet the requirements presented by "IMT for 2020 and beyond", the 3rd Generation Partnership Project (3GPP) New Radio (NR) system takes into account various scenarios, service requirements, potential system compatibility, etc., and time-frequency It is being discussed in the direction of supporting various numerology of resource unit standards.

The present invention can provide a method and apparatus for configuring a resource pool for sidelink in an NR system.

The present invention can provide a method and apparatus for configuring a unit for indicating a resource pool based on a slot configuration cycle of TDD UL-DL configuration in an NR system.

The present invention can provide a method and apparatus for indicating a resource pool through a bitmap for a unit and a bitmap for a slot unit for indicating a resource pool in the NR system.

The present invention can provide a method for a base station to configure a resource pool in an NR system. At this time, the method of configuring the resource pool by the base station determines the first period corresponding to one bit in the first bitmap based on the slot configuration period of the TDD UL-DL setup, and resource pool candidates based on the first period Indicating through a first bitmap; And indicating resource pools in each of the resource pool candidates through a second bitmap.

The features briefly summarized above with respect to the present disclosure are merely illustrative aspects of the detailed description of the present disclosure described below, and do not limit the scope of the present disclosure.

According to the present disclosure, it is possible to provide a method and apparatus for configuring a resource pool for sidelink in an NR system.

According to the present disclosure, it is possible to provide a method and apparatus for configuring a unit for indicating a resource pool based on a slot configuration cycle of TDD UL-DL configuration in an NR system.

According to the present disclosure, a method and apparatus for indicating a resource pool through a bitmap for a unit and a bitmap for a slot unit for indicating a resource pool in the NR system can be provided.

The effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art from the following description. will be.

1 is a view for explaining a V2X scenario to which the present disclosure can be applied.

2 is a diagram for explaining a V2X scenario to which the present disclosure can be applied.

3 is a diagram for explaining a V2X scenario to which the present disclosure can be applied.

4 is a diagram illustrating a V2X-related service to which the present disclosure can be applied.

5 is a view showing a frame structure for downlink / uplink transmission to which the present disclosure can be applied.

6 is a diagram showing a resource grid and a resource block to which the present disclosure can be applied.

7 is a view showing a downlink synchronization signal to which the present disclosure can be applied.

8 is a view showing an SSB cycle to which the present disclosure can be applied.

9 is a diagram illustrating a method in which TDD UL-DL configuration is set in an NR sidelink system to which the present disclosure can be applied.

FIG. 10 is a diagram showing how a TDD UL-DL configuration is set in an NR sidelink system to which the present disclosure can be applied.

11 is a diagram showing a method of configuring a bitmap indicating a resource pool based on a fixed bitmap length to which the present disclosure can be applied.

12 is a diagram illustrating a method of configuring a bitmap indicating a resource pool in consideration of a set bitmap length based on an SSB period to which the present disclosure can be applied.

13 is a diagram showing an additional bitmap applied to each of the resource pool candidates to which the present disclosure can be applied.

14 is a flowchart illustrating a method of configuring a resource pool by a base station to which the present disclosure can be applied.

15 is a view showing the configuration of a base station apparatus and a terminal apparatus to which the present disclosure can be applied.

The present invention can provide a method for a base station to configure a resource pool in an NR system. At this time, the method of configuring the resource pool by the base station determines the first period corresponding to one bit in the first bitmap based on the slot configuration period of the TDD UL-DL setup, and resource pool candidates based on the first period It may include indicating through the first bitmap, and indicating resource pools from each of the resource pool candidates through the second bitmap.

Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present disclosure pertains can easily carry out the embodiments. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein.

In describing the embodiments of the present disclosure, when it is determined that a detailed description of a known configuration or function may obscure the subject matter of the present disclosure, detailed description thereof will be omitted. In the drawings, parts irrelevant to the description of the present disclosure are omitted, and similar reference numerals are used for similar parts.

In the present disclosure, when a component is said to be "connected", "coupled" or "connected" with another component, this is not only a direct connection relationship, but also an indirect connection relationship in which another component exists in the middle. It may also include. Also, when a component is said to "include" or "have" another component, this means that other components may be further included instead of excluding other components unless specifically stated to the contrary. .

In the present disclosure, terms such as first and second are used only for the purpose of distinguishing one component from other components, and do not limit the order or importance of components, etc., unless otherwise specified. Accordingly, within the scope of the present disclosure, the first component in one embodiment may be referred to as the second component in other embodiments, and likewise the second component in one embodiment may be the first component in another embodiment It can also be called.

In the present disclosure, the components that are distinguished from each other are for clarifying each feature, and the components are not necessarily separated. That is, a plurality of components may be integrated to be composed of one hardware or software unit, or one component may be distributed to be composed of a plurality of hardware or software units. Accordingly, such integrated or distributed embodiments are included within the scope of the present disclosure, unless otherwise stated.

In the present disclosure, components described in various embodiments are not necessarily essential components, and some may be optional components. Accordingly, an embodiment comprised of a subset of components described in one embodiment is also included in the scope of the present disclosure. Also, embodiments that include other elements in addition to the elements described in various embodiments are included in the scope of the present disclosure.

In addition, this specification is described for a wireless communication network, the work performed in the wireless communication network is performed in the process of controlling the network and transmitting data in a system (for example, a base station) that is in charge of the wireless communication network, or the wireless The operation can be performed at the terminal coupled to the network.

That is, it is apparent that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station can be performed by a base station or other network nodes other than the base station. The term 'base station (BS)' may be replaced by terms such as a fixed station, Node B, eNodeB (eNB), gNodeB (gNB), ng-eNB, and access point (AP). . In addition, 'terminal (terminal)' is to be replaced by terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), Subscriber Station (SS), non-AP STA, etc. Can be.

In the present disclosure, transmitting or receiving a channel includes transmitting or receiving information or a signal through the corresponding channel. For example, transmitting a control channel means transmitting control information or a signal through the control channel. Similarly, transmitting a data channel means transmitting data information or a signal through the data channel.

In the following description, the term NR system is used for the purpose of distinguishing a system to which various examples of the present disclosure are applied from an existing system, but the scope of the present disclosure is not limited by these terms.

For example, the NR system supports various subcarrier spacings (SCSs) in consideration of various scenarios, service requirements, and potential system compatibility. In addition, NR systems are designed to overcome poor channel environments such as high path-loss, phase-noise and frequency offset occurring on a high carrier frequency. It can support the transmission of the physical signal / channel through the beam.

Through this, the NR system can support applications such as enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTC) / ultra Machine Type Communications (uMTC), and Ultra Reliable and Low Latency Communications (URLLC). However, although the term NR system in this specification is used as an example of a wireless communication system, the term NR system itself is not limited to the above-described features.

In addition, as an example, 5G mobile communication technology may be defined. In this case, as an example, 5G mobile communication technology may be defined to include not only the above-described NR system, but also an existing Long Term Evolution-Advanced (LTE-A) system. That is, 5G mobile communication may be a technology that operates in consideration of backward compatibility with a previous system as well as a newly defined NR system.

As an example, the sidelink field of 5G may include both sidelink technology in an LTE system and sidelink technology in an NR system. At this time, the side link field may be an essential field for improving performance through ultra-high reliability and ultra-low delay and grafting new and diverse services.

For the convenience of description, the following describes the operation and related information for V2X based on the NR system. However, the following features may not be limited to a specific system, and may be applied to other systems similarly implemented, and are not limited to the above-described embodiments.

Meanwhile, V2X may be vehicle-based communication. At this time, the concept of a vehicle is changing from a simple vehicle to a new platform. For example, IT technologies are applied to a vehicle, and various V2X services are provided based on this. For example, services such as preventing traffic accidents, improving the traffic environment, autonomous driving, and remote driving are provided. To this end, in relation to V2X, there is an increasing need for development and application of sidelink-related technologies.

More specifically, with respect to the existing communication technology, communication from the base station to the terminal may be downlink, and communication from the terminal to the base station may be uplink. However, not only communication between the base station and the terminal, but also communication between the terminals may be necessary, and communication from the terminal to the terminal may be the aforementioned side link. For example, in relation to the above-described V2X, communication with each other or communication with a vehicle and other objects (objects other than a base station such as a pedestrian terminal (UE) or a terminal-type road peripheral unit (UE-type roadside unit)). This can be a side link. That is, in the case of performing vehicle-based communication, there is a limitation only by communication with a base station, and the above-described sidelink technology can be developed and applied.

1 to 3 are diagrams showing a V2X scenario.

In this case, FIG. 1 may be a scenario for performing communication based on the sidelink described above. In addition, FIG. 2 may be a V2X operation scenario using communication with a terminal (or vehicle) and a base station. In addition, FIG. 3 may be a scenario for performing a V2X operation using both the above-described sidelink and communication with the base station.

In this case, as an example, in relation to V2X, the terminal described below may be a vehicle. In the following, for convenience of description, it is referred to as a terminal uniformly, but the terminal may be a vehicle for V2X. Further, as an example, the terminal may refer to a device capable of performing communication with a sidelink and a base station, and is not limited to the above-described embodiment. However, hereinafter, it is referred to as a terminal for convenience of description.

In addition, as an example, terms necessary for V2X may be defined as in Table 1 below. In this case, as an example, D2D (Device to Device) may mean communication between terminals. Further, ProSe may mean a proximity service to a terminal performing D2D communication. In addition, the sidelink (SL) may be the sidelink described above, and the Sidelink Control Information (SCI) may refer to the control information related to the sidelink. Further, a PSSCH (Physical Sidelink Shared Channel) may be a channel through which data is transmitted through the sidelink, and a PSCCH (Physical Sidelink Control Channel) may be a channel through which control information is transmitted through the sidelink. In addition, PSBCH (Physical Sidelink Broadcast Channel) is a channel for transmitting a signal in a broadcast manner through a sidelink, and system information may be transmitted. In addition, the PSDCH (Physical Sidelink Discovery Channel) may be a channel used for signal discovery as a discovery channel. Also, a Sidelink Synchronization Signal (SLSS) may be a synchronization signal for a sidelink, and a PSSID (Physical-layer Sidelink Synchronization Identity) may be ID information for sidelink synchronization. In addition, Sidelink group destination identity (nSAID) is ID information for distinguishing sidelink groups, and NSLID may be ID information for sidelink synchronization described above. In addition, SA, TB, TTI and RB in Table 1 may be terms that are used in the same way as the existing LTE. In addition, V2V may mean communication between vehicles, V2P may be communication between vehicles and pedestrians, and V2I / N may mean communication between a vehicle and an infrastructure / network. This will be described later.

[Table 1]

Further, as an example, in V2X communication, control information transmitted from a terminal to another terminal may be SA. When the above-described control information is used in sidelink communication, the above-described control information may be SCI. In this case, the control information described above is a sidelink, and the control information may be transmitted through the PSCCH, a channel through which control information is transmitted in the sidelink.

In addition, as an example, data transmitted from a terminal to another terminal in V2X communication may be configured in TB units. At this time, when data is transmitted through the side link, transmission may be performed through the PSSCH, which is a channel through which the above-described data is transmitted.

In addition, in the present disclosure, an operation mode may be defined according to a resource allocation method for control information and data transmission for V2X communication or direct link (eg, D2D, ProSe or SL) communication.

For example, the base station resource scheduling mode may be a mode in which a base station or a relay node schedules resources used by a terminal to transmit V2X (or direct link) control information and / or data. Through this, the terminal may transmit V2X (or direct link) control information and / or data, and this mode may be the base station resource scheduling mode.

For example, the base station or the relay node performs sidelink (or direct link) control information and / or scheduling information for resources to be used for data transmission through downlink control information (DCI) sidelink (or direct link). It can be provided to the transmitting terminal. Accordingly, the sidelink (or direct link) transmitting terminal transmits sidelink (or direct link) control information and data to the sidelink (or direct link) receiving terminal, and the sidelink (or direct link) receiving terminal sidelinks (Or direct link) The side link (or direct link) data may be received based on the control information.

Meanwhile, in the terminal autonomous resource selection mode, the terminal itself selects resources used by the terminal to transmit control information and data, and the resource selection is sensed by the terminal in a resource pool (ie, a set of resource candidates). (sensing). Through this, the terminal can transmit control information and data, and this mode may be a terminal autonomous resource selection mode.

For example, a sidelink (or direct link) transmitting terminal transmits sidelink (or direct link) control information and data to a sidelink (or direct link) receiving terminal from a resource selected by the sidelink, or a sidelink (or direct link). The receiving terminal may receive sidelink (or direct link) data based on the sidelink (or direct link) control information.

In this case, as an example, the above-described base station resource scheduling mode may be referred to as mode 1 (mode 1) in side link (or direct link) communication for D2D or the like. In addition, the above-described base station resource scheduling mode may be referred to as mode 3 (Mode 3) in sidelink communication for V2X and the like. In addition, the terminal autonomous resource selection mode may be referred to as mode 2 in sidelink (or direct link) communication for D2D or the like. In addition, the terminal autonomous resource selection mode may be referred to as Mode 4 in sidelink communication for V2X or the like. However, this is only one embodiment, and is not limited to the above-described name. That is, the same object and the same operation can be viewed in the same mode.

In addition, hereinafter, for convenience of explanation, the description will be based on V2X communication, but is not limited thereto. For example, the present invention may be equally applied to communication based on a direct link such as D2D, ProSe, etc., and is not limited to the above-described embodiment.

Further, as an example, V2X may be a general term for V2V, V2P and V2I / N. At this time, each of V2V, V2P and V2I / N may be defined as shown in Table 2 below, but is not limited thereto. That is, Table 2 below is only one example and is not limited thereto.

[Table 2]

In addition, V2X communication may include PC5 based communication which is an interface for sidelink communication.

For example, Table 3 and FIG. 1 may be a scenario supporting V2X operation based only on the PC5 interface (or SL). In this case, FIG. 1 (a) may be a V2V operation, (b) a V2I operation, and (c) a V2P operation. That is, in FIG. 1, communication may be performed based on the sidelink described above, and communication may be performed without a base station.

[Table 3]

Meanwhile, Table 4 and FIG. 2 may be a scenario supporting V2X operation based only on a Uu interface (ie, an interface between a UE and a base station). For example, FIG. 2 (a) may indicate a V2V operation, (b) a V2I operation, and (c) a V2P operation. That is, V2X operation may be supported using communication between the terminal and the base station.

[Table 4]

Table 5 and FIG. 3 may be a scenario supporting V2X operation using both Uu interface and PC5 interface (or SL). At this time, FIG. 3 (a) may represent scenario 3A of Table 5, and FIG. 3 (b) may represent scenario 3B of Table 5.

More specifically, based on FIG. 3 (a), the terminal may transmit a V2X message to other terminals through a side link. Any one of the terminals receiving this may transmit a V2X message to the base station through an uplink. The base station receives the V2X message, and can transmit the message based on this to other neighboring terminals through the downlink. In this case, as an example, the downlink may be performed through a broadcast method.

As another example, FIG. 3 (b) shows that a terminal transmits a V2X message to a base station through an uplink, and the base station can transmit at least one terminal or RSU (Roadside Unit). Thereafter, the terminal or the RSU receiving the message may transmit a message to a plurality of nearby terminals through a side link.

That is, both of FIG. 3 (a) and FIG. 3 (b) can support V2X operation using both communication and a side link between a base station and a terminal, and are not limited to the above-described embodiment.

[Table 5]

As described above, V2X communication may be performed through a base station or may be achieved through direct communication between terminals. At this time, in the case of passing through the base station, in V2X communication, transmission / reception may be performed through a Uu link, which is a communication interface between the base station and the terminal. In addition, when a side link is used as direct communication between terminals, in V2X communication, transmission / reception may be performed through a PC5 link that is a communication interface between the terminal and the terminal.

In addition, as an example, V2X communication may be performed using a communication between a terminal and a base station and a side link between terminals in an NR system. At this time, as an example, the communication between the base station and the terminal (uplink / downlink) in the NR system and the communication between the base station and the terminal (uplink / downlink) in the existing system may be different. That is, some features may be similar, and there may be a part that is changed based on the new system NR system. In addition, as an example, the side link may also have a difference between a side link in an existing system and a side link in an NR system. That is, in consideration of the above-mentioned differences in communication between the base station and the terminal, a side link may also be changed in the new system NR system. The following describes a method of configuring a resource pool for V2X and transmitting related information in the NR system based on the above-described features.

4 is a diagram showing a service provided based on a side link.

Referring to FIG. 4, a V2X related service or an Internet of Things (IoT) service may be provided based on 5G sidelink. In this case, as an example, the 5G sidelink may be a concept including both a sidelink based on an existing LTE system and a sidelink considering an NR system. That is, it may be a service provided in consideration of a side link applied in each system, and is not limited to the above-described embodiment.

For example, referring to FIG. 4, in connection with the V2X service, clustering, autonomous driving, advanced sensors, and remote driving services may be provided. At this time, cluster driving may be a technique in which a plurality of vehicles dynamically form a group and operate similarly. In addition, autonomous driving may be a technique of driving a vehicle based on fully automated and semi-automated. Further, the evolved sensor may be a technique of collecting and exchanging data obtained from a sensor or video image. Further, the remote driving may be a technology for remote control of a vehicle and a technology for applications. That is, the above-described services may be provided as a service based on V2X. However, the above-described service is only one example, and is not limited to the above-described embodiment. At this time, in order to provide the above-described V2X service, requirements such as ultra-low delay, ultra-connection, low power and high reliability may be required. Therefore, in the 5G sidelink, an operation method for satisfying the above-described service and the corresponding requirements may be required, and a detailed method will be described below in consideration of these requirements.

The following describes the NR system. As an example, FIGS. 5 and 6 are diagrams illustrating a frame structure and resource blocks for an NR system.

5 is a diagram illustrating an NR frame structure and a numerology according to an embodiment of the present invention.

In NR, the basic unit of time domain is

Can be At this time,

ego,

Can be In addition,

May be a constant for a multiple relationship between an NR time unit and an LTE time unit. In reference time unit, in LTE

And

Can be defined.

프레임 구조Frame structure

Referring to FIG. 5, the time structure of a frame for downlink / uplink (DL / UL) transmission is

Can have At this time, one frame

It consists of 10 subframes corresponding to time. The number of consecutive OFDM symbols per subframe is

Can be Further, each frame is divided into two half frames, and the half frame may be composed of 0 to 4 subframes and 5 to 9 subframes. At this time, half frame 1 (half frame 1) may be composed of 0 to 4 subframes, and half frame 2 (half frame 2) may be composed of 5 to 9 subframes.

At this time, the transmission timing of the uplink transmission frame i is determined based on Equation 1 below based on the downlink reception timing at the terminal.

Equation 1 below

May be a TA offset value that occurs due to a duplex mode difference. Basically, in FDD (Frequency Division Duplex)

Has 0, but in TDD (Time Division Duplex), considering the margin for DL-UL switching time,

It can be defined as a fixed value.

[Equation 1]

6 is a view showing a resource grid (Resource Grid) and a resource block (Resource Block).

Referring to FIG. 6, resource elements in a resource grid may be indexed according to each subcarrier spacing. At this time, one resource grid may be generated for each antenna port and for each subcarrier spacing. Uplink and downlink transmission and reception may be performed based on a corresponding resource grid.

One resource block is composed of 12 resource elements on the frequency domain. As shown in Equation 2 below, an index for one resource block per 12 resource elements (

). The index for the resource block can be utilized within a specific frequency band or system bandwidth.

[Equation 2]

뉴머놀러지(Numerologies)Numerologies

Numerology can be variously configured to satisfy various services and requirements of the NR system. For example, unlike the existing LTE / LTE-A system supporting one subcarrier spacing (SCS), a plurality of SCSs may be supported.

New numerology for NR systems, including support for multiple SCSs, below 3 GHz to solve the problem of not being able to use a wide bandwidth in a frequency range or carrier such as the existing 700 MHz or 2 GHz , 3GHz ~ 6GHz or 6GHZ ~ 52.6GHz can operate in the frequency range or carrier. However, the scope of the present disclosure is not limited thereto.

As an example, referring to Table 6 below, numerology may be defined based on subcarrier spacing (SCS), CP length, and the number of OFDM symbols per slot, used in an orthogonal frequency division multiplexing (OFDM) system. have. The above-described values may be provided to the terminal through higher layer parameters DL-BWP-mu and DL-BWP-cp (DL) and UL-BWP-mu and UL-BWP-cp (UL).

In addition, as an example, in Table 6 below

When 2 is a subcarrier spacing of 60 kHz, a normal CP (Extended CP) and a normal CP (Extended CP) may be applied in a case where the subcarrier spacing is 60 kHz, and only the normal CP may be applied in other bands.

[Table 6]

At this time, the normal slot (Normal slot) may be defined as a basic time unit used to basically transmit one data and control information in the NR system. The length of the general slot may basically consist of the number of 14 OFDM symbols. Also, unlike the slot, the subframe has an absolute time length corresponding to 1 ms in the NR system and can be used as a reference time for the length of another time interval. At this time, for coexistence or backward compatibility (backward compatibility) of the LTE and NR system, a time period such as a subframe of LTE may be required in the NR standard.

For example, in LTE, data may be transmitted based on a transmission time interval (TTI) that is a unit time, and the TTI may be configured in one or more subframe units. At this time, even in LTE, one subframe may be set to 1 ms, and 14 OFDM symbols (or 12 OFDM symbols) may be included.

Also, a non-slot can be defined in the NR. The non-slot may mean a slot having a number as small as at least one symbol than a normal slot. For example, in the case of providing a low latency, such as an Ultra-Reliable and Low Latency Communications (URLLC) service, the latency may be reduced through a non-slot having a smaller number of symbols than a normal slot. In this case, the number of OFDM symbols included in the non-slot may be determined in consideration of the frequency range. For example, a non-slot of 1 OFDM symbol length may be considered in a frequency range of 6 GHz or more. As another example, the number of OFDM symbols defining a non-slot may include at least two OFDM symbols. At this time, the range of the number of OFDM symbols included in the non-slot may be configured as the length of the mini-slot up to (normal slot length) -1. However, as a non-slot standard, the number of OFDM symbols may be limited to 2, 4 or 7 symbols, but is not limited to the above-described embodiment.

Also, as an example, in the unlicensed band below 6 GHz

Subcarrier spacing corresponding to 1 and 2 is used, and in the unlicensed band above 6 GHz

In subcarrier spacing corresponding to 3 and 4 may be used.

In addition, Table 7 is for each subcarrier spacing setting in case of a normal CP.

Number of OFDM symbols per slot

Indicates. Table 7 shows the number of OFDM symbols per slot, the number of slots per frame, and the number of slots per subframe according to each subcarrier spacing value as provided in Table 6. At this time, Table 7 shows the above-mentioned values based on a general slot having 14 OFDM symbols.

[Table 7]

In addition, as described above,

When is 2, the extended CP may be applied when the subcarrier spacing is 60 kHz. Table 8 is a case of extended CP

Number of OFDM symbols per slot

Can represent each value based on 12 general slots. In this case, referring to Table 8, in the case of an extended CP conforming to 60 kHz subcarrier spacing, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe may be indicated.

[Table 8]

In addition, as described above, one subframe may correspond to 1 ms on the time axis. In this case, as an example, one slot may correspond to 14 symbols on the time axis. As another example, one slot may correspond to seven symbols on the time axis. Accordingly, the number of slots and symbols that can be considered in each radio frame (10 ms) may be set differently. In this case, Table 9 may be the number of slots and the number of symbols according to each SCS. For example, when the SCS is 15Khz, one slot is 1ms and 14 symbols may be included in one slot. In addition, as an example, when the SCS is 30KhZ, one slot is 0.5ms, and 14 symbols may be included in one slot. That is, 28 symbols may be included in a time corresponding to 1 ms.

Meanwhile, as an example, SCS of 480 KHz in Table 9 below may not be considered, and is not limited to the above-described embodiment.

[Table 9]

7 is a view for explaining a downlink synchronization signal in a wireless communication system.

For example, in the NR system, two types of synchronization signals can be defined. At this time, the two types of synchronization signals may include NR-PSS (Primary Synchronization Signal) and NR-SSS (Secondary Synchronization Signal). The NR-PSS may be used for synchronization of an initial symbol boundary for an NR cell. In addition, NR-SSS can be used to detect an NR cell ID.

Meanwhile, a bandwidth for transmission of PSS / SSS and / or PBCH (Physical Broadcast CHannel) in a wireless communication system (eg, LTE / LTE-A system) prior to the NR system corresponds to 6 Physical Resource Blocks (PRBs) 1.08MHz could be used. At this time, the NR system may use a wider transmission bandwidth than the previous wireless communication system to transmit NR-PSS / SSS and / or NR-PBCH (Physical Broadcast Channel). To this end, subcarrier spacing (SCS) greater than 15 kHz may be used.

For example, when operating below 6 GHz, one of 15 KHz and 30 KHz may be considered as the default SCS. When operating at 6 GHz or higher (for example, when operating between 6 GHz and 52.5 GHz), one of 120 KHz and 240 KHz may be considered as the default SCS, but is not limited to the above-described embodiment.

More specifically, the default SCS set and minimum carrier bandwidth assumed by the terminal during initial access may be defined as follows. In the case of 6 GHz or less, the terminal can basically assume a bandwidth of 15 kHz SCS and 5 MHz. At this time, it is possible to assume a bandwidth of 30 kHz SCS and 10 MHz in a specific band, and is not limited to the above-described embodiment. On the other hand, in case of 6 GHz or more, the terminal may assume 120 kHz SCS and 10 MHz bandwidth.

In addition, SCSs supported for data and / or control information may vary according to a specific frequency band.

For example, when operating at 1 GHz or less, SCS of 15 kHz, 30 kHz, and 60 kHz may be supported. Further, for example, when operating between 1 GHz and 6 GHz, SCS of 15 kHz, 30 kHz, and 60 kHz may be supported. As another example, when operating between 24 GHz and 52.6 GHz, SCS of 60 kHz and 120 kHz may be supported. Meanwhile, for example, 240 kHz may not be supported for data, and the supported SCS may be determined according to a band.

The NR-PSS, NR-SSS and / or NR-PBCH may be transmitted in a Synchronization Signal (SS) block. Here, SSB may mean a time-frequency resource region including all of NR-PSS, NR-SSS and / or NR-PBCH.

At this time, one or more SSBs may constitute an SS burst. One SS burst may be defined to include a predetermined number of SSBs, which may be referred to as a duration of the SS burst, but is not limited to the above-described embodiment.

Also, one or more SSBs within one SS burst may be continuous or discontinuous. Also, one or more SSBs in one SS burst may be the same or different from each other.

Also, as an example, one or more SS bursts may constitute an SS burst set. One SS burst set may include a predetermined period and a predetermined number of SS bursts. At this time, the number of SS bursts in the SS burst set may be finite. In addition, the transmission time point of the SS burst set may be defined periodically or aperiodically.

Further, for example, for a specific frequency range or carrier, one or more subcarrier spacings (SCS) may be predefined for each synchronization signal (eg, NR-PSS, NR-SSS, NR-PBCH). In this case, the applicable SCS may be one or more of 15, 30, 120 or 240 kHz.

Here, SCSs for NR-PSS, NR-SSS, or NR-PBCH may be the same. Also, one or more frequency ranges may be given, or different frequency ranges may overlap each other. In addition, one neurology may be defined for a specific frequency range, or a plurality of neurology may be defined. Accordingly, one or a plurality of subcarrier spacings (SCS) may be defined for a specific frequency range. Also, from the perspective of the terminal, transmission of the SS burst set may be periodic.

At this time, one or a plurality of SSBs may be configured as one SS burst. SSBs constituting one SS burst may be allocated continuously or discontinuously in the time or frequency domain, and are not limited to the above-described embodiment. Also, one or a plurality of SS bursts may be configured as one SS burst set. From the UE perspective, the transmission of the SS burst set is periodic, and the UE may assume a default transmission period value during at least initial cell selection for each specific carrier frequency. The UE may be provided with updated information about the SS burst set transmission period from the base station. Also, as an example, transmission of SSBs within an SS burst set may be limited to a 5 ms window regardless of the SS burst set period. At this time, the number of possible candidates for the SSB location in the 5 ms window may be L.

As described above, the transmission of SSBs can be performed in a 5ms window within the SS burst set. At this time, referring to FIG. 8, the starting point of the SSB burst set for SSB transmission may be determined based on the SSB offset value. Also, as an example, the SSB periodicity (SSB periodicity) may be determined as 20 ms by default. That is, the default value for the SS burst set period may be set to 20 ms. At this time, the SSB period may be set differently by higher layer signaling. For example, the SSB period may be set to any one of 5 ms, 10 ms, 20 ms, 40 ms, 80 ms, or 160 ms by upper layer signaling. In this case, as an example, the upper layer signaling may be RRC signaling.

The following describes a method of configuring a resource pool in consideration of the NR sidelink. In this case, the resource pool may mean resource candidates that can be used for sidelink communication as time and frequency resources. For example, the following may be a method for configuring a resource pool for a case that operates based on TDD.

For example, in the V2X of the previous system (e.g. LTE system), the configuration for the resource pool may be indicated based on the TDD UL-DL setting. More specifically, in the previous system, 10-bit values (1024 kinds) in 10 ms units within 10 240 ms may be indicated based on the SFN (System Frame Number) index. However, when all 10240 ms are considered to indicate the resource pool, there may be too much information to be indicated, and the configured resource pool may be indicated based on a certain period (or a certain unit). For example, the resource pool may be indicated based on the bitmap. Here, the resource pool may be indicated at a certain period (or a certain unit) based on the length of the bitmap, and the configuration for this may be repeated. At this time, in order to efficiently indicate the resource pool, information on the resource pool may be indicated except for the subframe related to synchronization at 10240ms described above. Further, as an example, in a previous system, a downlink subframe, an uplink subframe, and a special subframe may be set based on the TDD UL-DL configuration. At this time, information on the resource pool may be indicated except for the downlink subframe and the special subframe, which are not required to indicate the resource pool.

In addition, as an example, as described above, the resource pool may be indicated based on a certain period (or a certain unit). As a result, the resource pool for the resource pool is excluded, except for the remaining subframes based on multiples of the period at 10240 ms. Information can be directed.

That is, synchronization related subframes, downlink subframes, special subframes, and remaining subframes are excluded, and information about the resource pool may be indicated. At this time, the bitmap is formed based on the remaining subframes except for the above-described subframe, and a resource pool used based on this may be indicated.

At this time, as an example, in the NR sidelink system, a resource pool may be configured and indicated in consideration of the above. However, in the NR sidelink system, the subframe may not be set to 1 ms based on the SCS. Therefore, the resource pool may be difficult to be indicated based on the subframe unit like the existing system, and the resource pool indicating method will be described below in consideration of this.

In this case, referring to FIGS. 9 and 10 as an example, a TDD UL-DL configuration may be set in an NR sidelink system.

In more detail, the base station may transmit “TDD-UL-DL-ConfigurationCommon” to terminals through high-level signaling such as RRC (Radio Resource Control). At this time, based on the "TDD-UL-DL-ConfigurationCommon", a TDD UL-DL configuration may be commonly applied to terminals. For example, the TDD UL-DL configuration may be configured as pattern 1 as shown in FIG. 9. In addition, as an example, the TDD UL-DL configuration may be composed of pattern 1 and pattern 2 as shown in FIG. 10. That is, the base station may instruct the UEs to configure the TDD UL-DL semi-statically through RRC signaling.

At this time, the information on pattern 1 in relation to “TDD-UL-DL-ConfigurationCommon” may be as shown in Table 10 below. More specifically, Pmsec as one slot configuration period in TDD-UL-DL configuration is subcarrier spacing.

about

Slots. At this time, referring to Figure 9, the first of the S slot

The slots can only include downlink symbols. Also, the last of the S slots

The slots can only contain uplink symbols. Also, the first

After the slots, some symbols may be downlink symbols. At this time, the first

After symbols

The number of symbols may be a downlink symbol. Also, the last of the S slots

Some symbols before the slots may be an uplink symbol. At this time, last

Previous symbols

The number of symbols may be a downlink symbol. Also, the rest

The number of symbols may be a flexible symbol, and the flexible symbol may be set as a downlink symbol or an uplink symbol. Also, as an example, for every 20 / P periods, the first symbol may be the first symbol in the even-numbered frame. That is, as shown in FIG. 9, the TDD UL-DL configuration may be set as pattern 1 based on the P period.

Table 10

In addition, as an example, information regarding pattern 1 and pattern 2 in relation to “TDD-UL-DL-ConfigurationCommon” may be as shown in Table 11 below. More specifically, compared to pattern 1

The value may be the same as the value applicable to P. In this case, as one slot configuration period in the TDD-UL-DL configuration (configuration)

Subcarrier spacing

About the first

Slots and then

Slots. At this time,

First of all slots

The slots can only include downlink symbols. In addition,

Last of the three slots

The slots can only contain uplink symbols. first

After the slots, some symbols may be used for downlink. At this time,

After symbols

The symbols of may be a downlink symbol. Also, last

Some symbols before the slots can be used for uplink. At this time, last

Previous symbols

The number of symbols may be an uplink symbol. Remainder

The symbols may be flexible symbols.

Also, as an example,

Can be divided by 20msec, so every 20 /

For one period, the first symbol may be the first symbol in the even-numbered frame. In other words, considering the above, the actual applicable value is

It may be. However, it may not be limited thereto.

[Table 11]

In addition, as an example, in addition to “TDD-UL-DL-ConfigurationCommon”, which is instructed to be semi-static in common to the terminal, TDD-UL-DL configuration may be indicated to the terminal. For example, the base station may semi-statically indicate “TDD-UL-DL-ConfigDedicated” to each terminal through TDD UL-DL configuration dedicated to the terminal through signaling at a higher end such as RRC. At this time, as an example, in a TDD-UL-DL configuration indicated by “TDD-UL-DL-ConfigurationCommon”, information indicated as “TDD-UL-DL-ConfigDedicated” for a flexible symbol may be overridden. . That is, the configuration information for TDD UL-DL indicated as “TDD-UL-DL-ConfigDedicated” is overwritten on a flexible symbol per slot on a plurality of slots provided by “TDD-UL-DL-ConfigurationCommon”. It can be used, and is not limited to the above-described embodiment.

As another example, the base station TDD UL- through the SFI index (SFI-index) field value provided by the DCI format 2_0 (DCI format 2_0) parameters and parameters belonging to the "slotFormatCombToAddModList" transmitted by higher-level signaling such as RRC Configuration information for DL may be indicated. That is, the base station can dynamically indicate TDD UL-DL configuration information through DCI.

In this case, as an example, in the following, a TDD UL that is quasi-statically indicated based on at least one of “TDD-UL-DL-ConfigurationCommon” and “TDD-UL-DL-ConfigDedicated” as a resource pool configured semi-statically It may be a method of configuring a resource pool based on the configuration information for -DL, and this will be described.

실시예 (두 단계 비트맵을 통해 자원 풀 지시)Embodiment (resource resource instruction through two-step bitmap)

As described above, in the previous system, since the subframe is fixed at 1 ms, based on this, the subframe can be used as a unit of a bitmap indicating a resource pool. However, in the NR V2X sidelink system, the SCS may be set differently, and the number of slots within 10 ms may be different depending on the SCS. Therefore, in the NR V2X sidelink system, there is a limit to indicate in units of subframes. In this case, as an example, a unit corresponding to one bit in a bitmap for indicating a resource pool in the NR V2X sidelink system may be “Tms” as an NR resource pool indication unit. Further, as an example, Tms may be a unit (or period) in which one bit corresponds to a first bitmap for indicating resource pool candidates, and the resource pool candidate and the first bitmap will be described later. In addition, the naming for the above-described unit is only one example, and is not limited to the above-described embodiment. That is, a time interval corresponding to one bit in a bitmap indicating a resource pool in the NR system may be a specific unit (or period). Hereinafter, for convenience of description, it will be referred to as “Tms”, but is not limited thereto.

At this time, as an example, the bitmap for indicating the resource pool in the NR V2X sidelink system may be determined based on the above-described T value, and more details will be described in the following embodiment. The unit T corresponding to one bit in the bitmap for indicating the resource pool may be determined based on P values in Table 10 and Table 11.

More specifically, P may be determined as a slot configuration period for UL-DL transmission at the upper end according to the SCS, as described above. In this case, as an example, the TDD UL-DL setting may be set based on pattern 1 or pattern 1 / pattern 2. At this time, the period may be determined by P in pattern 1, and the period may be determined by P2 in pattern 2. However, as described above, when applicable to P2, P = P2. That is, the period can be considered to be determined based on the P value, and considering this point, the above-described T value can be determined to follow the period P. In this case, as an example, based on the above-described P value, the P and T values may be as shown in Table 12 below. That is, when the P value is determined, the unit T corresponding to one bit in the bitmap for indicating the resource pool may be set equal to P.

Table 12

As another example, P and a slot configuration period for UL-DL transmission at an upper end according to SCS

Can be determined. At this time, not only P but also cycle

Considering, the possible cycle may be as shown in Table 13 below. For example,

May have the same value as P, and there may be six possible values. At this time, the cycle P and

In consideration of the value, the T value described above may be determined to follow a period. For example, when the configuration for UL-DL transmission is only the period P as the above-described pattern 1, the T value may be set to be the same as the P value, and may be the same as cases 1 to 3 in Table 13 below. On the other hand, when the configuration for UL-DL transmission is set based on the periods P and P2 as the above-described pattern 1 and pattern 2, the T value is P and

As a value added, it may be the same as cases 4 to 6 in Table 13 below.

[Table 13]

As another example, the above-described T value may be used as a fixed value. At this time, as an example, in consideration of only the P value, which is the aforementioned period value, the T value may be fixed and used as one of three values in Table 14 below. When the T value is fixed to one of the values in Table 14, even if the terminal receives an indication for another P value, the T value may use a fixed value as a preset value. That is, the T value may be set and used as a fixed value by a candidate value for P.

Table 14

As another example, the above-described T value is used as a fixed value, but the period P and

It can be set to a value considering the value. That is, as shown in Table 15 below, any one of four values may be fixed and used. When the T value is fixed to any one of the values in Table 15 below, the terminal may use different P and / or

Even if an instruction for a value is received, a fixed value may be used as the T value. That is, the T value is P and / or

It can be set and used as a fixed value by a candidate value for.

Table 15

As another example, the above-described T value may be set as a multiple of the period P values. In this case, as an example, the T value may be set to a value in which SSB duration (or SSB window) is further considered. For example, since the SSB duration (SSB window) is 5 ms, the T value may be fixed to 5 ms as a multiple of the period P values and used.

As another example, the T value may be fixedly using 1 ms equal to the length of the LTE subframe in consideration of backward compatibility and coexistence with the previous system.

As another example, the T value is composed of at least two or more of the above-described methods, and one of them may be selectively used. For example, one of the case where the T value follows the period P and the case where the T value does not follow may be determined first through higher layer signaling. At this time, when the T value follows the period P, as described above, it is possible to follow the period P (for example, 0.625, 1.25 or 2.5) determined in the upper stage according to the SCS. In addition, as an example, if the T value does not follow the period P, it may be used in 1ms and / or 5ms in consideration of compatibility with the previous system or SSB duration, and is not limited to the above-described embodiment.

In addition, as an example, the T value may be determined and used by higher layer signaling as one of 0.625, 1.25, 2.5, 5, and 1. As another example, the T value may be determined and used by higher layer signaling as one of 0.625, 1.25, 2.5, and 5. As another example, the T value may be determined and used by higher layer signaling as one of 0.625, 1.25, 2.5, and 1.

That is, the T value may be determined based on at least one of a case in which it is set to follow a P value, a case in which a fixed value is set, and a case in which a plurality of values are set by signaling, and is not limited to the above-described embodiment Does not.

11 is a diagram illustrating a method of constructing a bitmap indicating a resource pool based on a fixed bitmap length.

For example, the bitmap length L may be fixed in a bitmap for indicating a resource pool used for NR V2X sidelink. At this time, a unit corresponding to one bit of the bitmap for indicating the resource pool may be the above-described T value. More specifically, in FIG. 11, it may be indicated as a bitmap whether it can be a resource pool candidate for each Tms. In this case, as an example, there is no need to indicate the section that cannot be a resource pool candidate, and a bitmap may be configured except for the section, and the specific method may be as shown in Equation 3 below.

[Equation 3]

Resource Pool Candidate Available Time Interval = (10240 / T) -B-C

At this time, T may be the above-described Tms. Also, B may be a value determined based on SSB. For example, the resource to which the SSB, which is a signal related to synchronization, is allocated cannot be used as a resource pool, and thus it is necessary to exclude this section. At this time, the B value may be determined based on the T value described above. For example, in the case of determining the B value, considering the entire 5 ms SSB duration, the B value may be as shown in Equation 4 below. More specifically, since the unit (or time interval) corresponding to one bit of the bitmap in Equation 3 is Tms, the T value may be considered at 5ms where SSB is present in Equation 4 below.

As a more specific example, if the SSB duration is 20ms, the SSB exists at 5ms, and the T value is 1.25, the B value is 2048 days as “(5 / 1.25) * (10240/20) = 4 * 512 = 2048” Can be. As another example, if the SSB duration is 80 ms, the SSB exists at 5 ms, and the T value is 0.625, the B value is 1024 days as “(5 / 0.625) * (10240/80) = 8 * 128 = 1024” Can be.

[Equation 4]

B = (5 / T) * (Number of 5ms SSB duration within 10240ms)

In addition, as an example, if Equation 4 is applied to “(10240 / T) -B” as a variable included in Equation 3, “(10240-5 * (number of 5ms SSB duration within 10240ms)) / T” It can be described as, Equation 3 above can be described as Equation 5 below.

[Equation 5]

Resource pool formation time interval = (10240-5 * (number of 5ms SSB duration within 10240ms)) / T-C

As another example, a value of B may be determined by considering only a resource section in which SSBs may actually exist during a 5 ms SSB duration. In this case, the B value may be determined as the number of resource periods in which SSBs may exist among (10240 / T) T-unit resource periods. That is, only the section in which the actual SSB may exist may be considered as the B value, and is not limited to the above-described embodiment.

In addition, as an example, in Equation 3, C may correspond to the remaining value when (10240 / A) -B is divided by L, and may be equal to Equation 6 below. That is, it may be a value in consideration of the remaining bits. In this case, the C value may be a value that divides the bitmap of length L when it is repeatedly applied within 10240 ms to periodically indicate resource pool information. Through this, information on the resource pool can be indicated based on the period, and is not limited to the above-described embodiment.

[Equation 6]

C = ((10240 / A) -B) mod L

In this case, as an example, the L value may be set to a value of 20 / T or 100 / T in consideration of the relationship with the previous system. In addition, as an example, the L value may be set to other values, and is not limited to the above-described embodiment.

Through the above, a bitmap of length L within 10240 ms can be repeatedly applied by ((10240 / A) -B-C) / L. In this case, resource units in T units corresponding to the “1” value among the bits for the bitmap described above may be candidates for the resource pool. At this time, as for the Tms, as illustrated in FIGS. 9 and 10, there are downlink, uplink, and flexible slots, and thus an additional bitmap may be required, which will be described later.

Referring to FIG. 11 with respect to the above-described resource pool candidates, each time period may be distinguished from 10240 ms to Tms units. At this time, except for the portions corresponding to the above-described B value and C value, the bitmap may be configured in the Tms unit for the remaining section. At this time, the bitmap may be mapped in multiples of the length L of the bitmap based on the C value, and each bit may indicate each time interval in units of Tms. Through this, resource units in T units may be configured as resource pool candidates.

12 is a view showing a method of configuring a bitmap indicating a resource pool in consideration of a set bitmap length based on the SSB period.

Referring to FIG. 12, the length L of the bitmap may be determined based on a fixed time period associated with the SSB period. At this time, the length L may be determined to correspond to an interval excluding the 5 ms SSB duration in the SSB period. For example, a fixed time period (hereinafter referred to as D value) as an interval excluding the 5 ms SSB duration may have an association with the SSB period. In this case, as an example, the SSB period may be any one of 20ms, 40ms, 80ms, or 160ms. Accordingly, the L value based on the D value as a fixed time interval excluding the 5 ms SSB duration may be as shown in Equation 7 below based on the Tms unit.

[Equation 7]

L = (D-5) / A

For example, when the SSB period is 20ms, the remaining 15ms period excluding 5ms within 20ms may be a fixed time period and L = 15 / T. In addition, as an example, when the SSB period is 40ms, the remaining 35ms interval excluding 5ms within 40ms may be a fixed time interval and L = 35 / T. In addition, as an example, when the SSB period is 80ms, the remaining 75ms period excluding 5ms within 80ms may be a fixed time period and L = 75 / T. In addition, as an example, when the SSB period is 160 ms, the remaining 155 ms interval excluding 5 ms within 160 ms may be a fixed time interval and L = 155 / T.

At this time, for example, 10240ms may be a multiple of the SSB period, and within 10240ms, a bitmap of length L may be repeated by 10240 / D, and the above-described C value may not be required. Also, resource sections in T units corresponding to the “1” value among the above-described bit values may be candidates for resource pools. At this time, as for the Tms, as illustrated in FIGS. 9 and 10, there are downlink, uplink, and flexible slots, and thus an additional bitmap may be required, which will be described later.

Referring to FIG. 12 with respect to the above-described resource pool candidates, each time period can be distinguished from 10240 ms to Tms units. At this time, since 10240ms is a multiple of the SSB period, when setting the bitmap length based on the SSB period, information on the resource pool can be repeatedly indicated without a remaining section. Accordingly, the length L value of the bitmap may be determined through a fixed time interval D value excluding the 5 ms SSB duration in the SSB period, and it may be possible to repeat the resource pool. That is, resource units in T units may be configured as resource pool candidates.

13 is a view showing an additional bitmap applied to each of the resource pool candidates.

Based on FIGS. 11 and 12, the bitmap may indicate resource pool candidates in units of Tms. At this time, as an example, as illustrated in FIGS. 9 and 10, the time period corresponding to the Tms unit includes downlink slots, uplink slots, and flexible slots. At this time, an additional bitmap for indicating a slot used as a resource pool in a time period corresponding to the Tms unit may be required. In this case, as an example, a bitmap for indicating resource pool candidates in Tms units based on FIGS. 11 and 12 is referred to as a first bitmap. In addition, an additional bitmap for indicating a slot used as a resource pool in a time period corresponding to a Tms unit is referred to as a second bitmap. However, the first bitmap and the second bitmap are referred to for convenience of description, and may be defined as other bitmaps, and are not limited to the above-described embodiments.

In this case, as an example, the Tms unit may correspond to P (0.625 ms, 1.25 ms, or 2.5 ms) as described above. In another example, the Tms unit is

(1.25ms, 2.5ms or 5ms). As another example, the Tms unit may be set to 1 ms in consideration of coexistence and backward compatibility with the previous system. As another example, in consideration of SSB duration, the Tms unit may be 5 ms, as described above. At this time, when configuring a resource pool in a time period corresponding to the Tms unit, the resource pool may be set based on an uplink slot (or symbol) in consideration of NR V2X sidelink communication. Accordingly, the second bitmap indicating the resource pool may be set in consideration of an uplink slot (or symbol) in a time period corresponding to the Tms unit.

For example, the second bitmap may be configured in consideration of a slot composed of only uplink symbols. In this case, referring to FIG. 13, the Tms unit may be determined to follow Pms in consideration of pattern 1 for TDD UL-DL configuration. That is, Tms and Pms may be the same. At this time, if Tms and Pms are the same, the length of the second bitmap is

It can be determined based on. That is, the length of the second bitmap may be set based on a slot including only uplink symbols. At this time, one bit of the second bitmap may correspond to one slot, and based on this, it may indicate whether each slot is configured as a resource pool.

As another example, the Tms unit may be set in consideration of P and P2 based on pattern 2 for TDD UL-DL configuration. “T = P =

ms ”,

And

The length of the second bitmap may be determined based on any one of the values. At this time, as an example, uslots and uslots, 2 may have the same value, and based on this, the length of the second bitmap may be determined. Also, as an example,

And

If is a different value, the length of the second bitmap is

And

It can be determined based on the larger value. Through this, the second bitmap is P and

A resource pool may be indicated in a time period corresponding to.

In another example, the Tms unit is “

It can be determined based on the value. In this case, as an example, “T =

In the case of ”, the length of the second bitmap may be determined based on uslots + uslots, 2.

As another example, when Tms is 1 ms, the length of the second bitmap may be determined based on the number of slots composed only of uplink symbols within 1 ms.

As another example, when Tms is 5ms, the length of the second bitmap may be determined based on the number of slots composed only of uplink symbols within 5ms.

As another example, the length of the second bitmap may be determined based on the number of slots including only uplink symbols within Tms in common. That is, the length of the second bitmap may be determined based on the number of slots including only uplink symbols within Tms regardless of the Tms value.

In addition, as an example, the second bitmap may be configured in consideration of a slot consisting only of uplink symbols and a slot including a part of the uplink symbols. In this case, referring to FIGS. 9 and 10, in some slots, uplink symbols are fixedly included, and the remaining symbols may be configured as flexible symbols. In this case, as an example, since the above-described slot also includes an uplink symbol, the second bitmap may be configured in consideration of the above-described slot. At this time, as an example, the Tms unit may be determined to follow Pms in consideration of pattern 1 for TDD UL-DL configuration. That is, Tms and Pms may be the same. At this time, if Tms and Pms are the same, the length of the second bitmap is

It can be determined based on. At this time, since there may be only one slot that partially includes uplink symbols, the length of the second bitmap is

Can be That is, the length of the second bitmap may be set based on a slot including only the uplink symbol and a slot fixedly including the uplink symbols. At this time, one bit of the second bitmap may correspond to one slot, and based on this, it may indicate whether each slot is configured as a resource pool.

ms ”,

And

The length of the second bitmap may be determined based on any one of the values. In this case, as an example,

Wow

May be the same value, and based on this, the length of the second bitmap may be determined. Also, as an example,

Wow

If is a different value, the length of the second bitmap is

And

A resource pool may be indicated in a time period corresponding to.

In another example, the Tms unit is “

It can be determined based on the value. In this case, as an example, “T =

”, The length of the second bitmap is

It can be determined based on. At this time, one slot can be set to include a part of the uplink symbols in each of P and P2 can be set, the length of the second bitmap is

It can be determined based on.

As another example, when the Tms is 1 ms, the length of the second bitmap includes a slot composed only of uplink symbols within 1 ms and some uplink symbols of a certain reference value (eg, the reference value is an integer of 1 or more). It can be determined based on the sum of the number of slots.

As another example, when the Tms is 5ms, the length of the second bitmap includes a slot composed only of uplink symbols within 5ms and some uplink symbols of a certain reference value (for example, the reference value is an integer of 1 or more). It can be determined based on the sum of the number of slots.

As another example, the length of the second bitmap commonly includes a number of slots consisting of only uplink symbols within Tms and slots partially including uplink symbols having a certain reference value (eg, the reference value is an integer of 1 or more). It can be determined based on the sum. That is, the length of the second bitmap is the number of slots consisting of only uplink symbols within the Tms regardless of the Tms value and slots partially including uplink symbols greater than or equal to a certain reference value (eg, the reference value is an integer of 1 or more). It can be determined based on the sum.

In addition, as an example, the second bitmap may be configured in consideration of a slot composed of only uplink symbols and a slot including flexible symbols. In this case, as an example, among slots including flexible symbols, a slot including a portion of downlink symbols may be excluded. In this case, referring to FIGS. 9 and 10, slots and flexible symbols including only uplink symbols may be configured. That is, the second bitmap may be configured based on a slot consisting only of uplink symbols and a slot not including a downlink symbol. At this time, as an example, the Tms unit may be determined to follow Pms in consideration of pattern 1 for TDD UL-DL configuration. That is, Tms and Pms may be the same. At this time, if Tms and Pms are the same, the length of the second bitmap is

It can be determined based on. At this time, S may be the total number of slots in Pms. That is, the length of the second bitmap may be determined based on a value obtained by subtracting one slot and one slot including only downlink symbols from all slots. At this time, one slot may be a slot fixedly including a downlink symbol as described above. At this time, one bit of the second bitmap may correspond to one slot, and based on this, it may indicate whether each slot is configured as a resource pool.

ms ”,

And

Wow

If is a different value, the length of the second bitmap is

And

A resource pool may be indicated in a time period corresponding to.

In another example, the Tms unit is “

It can be determined based on the value. In this case, as an example, “T =

”, The length of the second bitmap is

It can be determined based on.

As another example, when Tms is 1 ms, the length of the second bitmap is a slot composed of only uplink symbols within 1 ms and uplink symbols or constants having a certain reference value (eg, the reference value is an integer of 1 or more). The reference value (eg, the reference value may be determined based on the sum of slots including flexible symbols greater than or equal to 1). In this case, as an example, the length of the second bitmap may be determined except for slots that include a part of the downlink symbol among the slots including the flexible symbols.

As another example, when the Tms is 5ms, the length of the second bitmap is a slot composed of only uplink symbols within 5ms and uplink symbols or constants having a certain reference value (eg, the reference value is an integer of 1 or more). The reference value (eg, the reference value may be determined based on the sum of slots including flexible symbols greater than or equal to 1). In this case, as an example, the length of the second bitmap may be determined except for slots that include a part of the downlink symbol among the slots including the flexible symbols.

As another example, the length of the second bitmap is a slot consisting of only uplink symbols in Tms in common, and uplink symbols or a predetermined reference value (eg, a reference value is an integer of 1 or more) or more. For example, the reference value may be determined based on the sum of slots including flexible symbols of 1 or more). In this case, as an example, the length of the second bitmap may be determined except for slots that include a part of the downlink symbol among the slots including the flexible symbols. That is, the length of the second bitmap is a slot consisting only of uplink symbols within the Tms regardless of the Tms value and a predetermined reference value (eg, a reference value is an integer greater than or equal to 1) or a predetermined reference value (eg For example, the reference value may be determined based on the sum of slots including flexible symbols of 1 or more).

In addition, as an example, the second bitmap may be configured in consideration of a slot composed of only uplink symbols and a slot including flexible symbols. In this case, as an example, a slot including flexible symbols may include a slot including a part of downlink symbols. In this case, referring to FIGS. 9 and 10, slots and flexible symbols including only uplink symbols may be configured. That is, the second bitmap may be configured based on a slot composed of only uplink symbols and a slot including flexible symbols. At this time, as an example, the Tms unit may be determined to follow Pms in consideration of pattern 1 for TDD UL-DL configuration. That is, Tms and Pms may be the same. At this time, if Tms and Pms are the same, the length of the second bitmap is'

It can be determined based on. At this time, S may be the total number of slots in Pms. That is, the length of the second bitmap may be determined based on a value obtained by subtracting slots including only downlink symbols from all slots. At this time, one bit of the second bitmap may correspond to one slot, and based on this, it may indicate whether each slot is configured as a resource pool.

ms ”,

And

Wow

If is a different value, the length of the second bitmap is

And

A resource pool may be indicated in a time period corresponding to.

In another example, the Tms unit is “

It can be determined based on the value. In this case, as an example, “T =

”, The length of the second bitmap is

It can be determined based on.

As another example, when the Tms is 1 ms, the length of the second bitmap is a slot consisting only of uplink symbols within 1 ms and uplink symbols or constants having a certain reference value (eg, the reference value is an integer of 1 or more). The reference value (eg, the reference value may be determined based on the sum of slots including flexible symbols greater than or equal to 1).

As another example, when the Tms is 5ms, the length of the second bitmap is a slot composed of only uplink symbols within 5ms and uplink symbols or constants having a certain reference value (eg, the reference value is an integer of 1 or more). The reference value (eg, the reference value may be determined based on the sum of slots including flexible symbols greater than or equal to 1).

As another example, the length of the second bitmap is a slot consisting of only uplink symbols in Tms in common, and an uplink symbol or a predetermined reference value (eg, a reference value is an integer of 1 or more) or more. For example, the reference value may be determined based on the sum of slots including flexible symbols of 1 or more). That is, the length of the second bitmap is a slot consisting only of uplink symbols within the Tms regardless of the Tms value, and uplink symbols or constant reference values (eg, the reference value is an integer of 1 or more) or more. For example, the reference value may be determined based on the sum of slots including flexible symbols of 1 or more).

Also, as an example, the second bitmap may be determined based on all slots in the resource pool candidate. At this time, in common with T, the length of the secondary bitmap may be determined by the number of slots in the T section. That is, the number of slots in the T section may be determined as T? 2u in consideration of the SCS. At this time, one bit of the 2 bitmap may correspond to one slot, and through this, a resource pool may be indicated.

Resource pool candidates may be indicated as described above based on the first bitmap. In addition, each of the resource pool candidates may indicate each resource pool based on the second bitmap. That is, the resource pool may be determined based on the first bitmap and the second bitmap described above. In this case, as an example, slots corresponding to a value of “1” in the first bitmap may be configured as a final resource pool. In addition, uplink symbols in respective slots corresponding to a value of “1” in the second bitmap may be a final resource pool, as described above.

Further, as an example, each of the method of configuring the first bitmap and the method of configuring the second bitmap may be used in combination with each other, and is not limited to the above-described embodiment.

14 is a flowchart illustrating a method of configuring a resource pool by a base station to which the present invention can be applied.

Referring to FIG. 14, the first period corresponding to one bit in the first bitmap may be determined based on the slot construction period of the TDD-UL-DL configuration (S1410). At this time, as described above with reference to FIGS. 1 to 13, a first bitmap and a second bitmap for indicating a resource pool may be determined. In this case, as an example, the first period may be the above-described Tms, and the slot configuration period of the TDD-UL-DL configuration may be the above-described Pms and / or

It can be ms. That is, the first bitmap indicating resource pool candidates is Pms and / or

It can be determined based on Tms unit (or period) based on ms, as described above.

The base station may indicate the resource pool candidates to the terminal through the first bitmap based on the first period (S1420). In this case, as described above with reference to FIGS. 1 to 13, at this time, the first bitmap may be determined based on Tms units (or periods) as described above. At this time, the base station may indicate to the resource pool through each bit included in the first bitmap, and may transmit information about this to the terminal. At this time, the terminal may recognize a time interval corresponding to the bit indicated as “1” in the first bitmap as a resource pool candidate and determine a resource pool candidate based on the time period.

In addition, the base station may instruct each of the resource pool candidates to the UE through the second bitmap (S1430). At this time, as described above with reference to FIGS. 1 to 13, the second bitmap may indicate a resource pool in slots within Tms as each resource pool candidate. At this time, as an example, as described above, there may be slots including only downlink symbols, slots including only uplink symbols, and flexible slots within Tms. At this time, the second bitmap may indicate the final resource pool within Tms. Also, as an example, one bit in the second bitmap may correspond to a slot. However, the target slot indicated by the bits of the second bitmap may be set based on various methods, as described above. At this time, the base station may indicate to the final resource pool through each bit included in the second bitmap, and may transmit information about this to the terminal. At this time, the terminal may recognize the uplink symbols in the time interval corresponding to the bit indicated by “1” in the second bitmap as the final resource pool and determine the resource pool based on this, as described above.

15 is a view showing the configuration of a base station apparatus and a terminal apparatus according to the present disclosure.

The base station apparatus 1500 may include a processor 1520, an antenna unit 1512, a transceiver 1514, and a memory 1516.

The processor 1520 performs baseband-related signal processing, and may include an upper layer processing unit 1530 and a physical layer processing unit 1540. The upper layer processing unit 1540 may process operations of a medium access control (MAC) layer, a radio resource control (RRC) layer, or more. The physical layer processor 1540 may process operations of a physical (PHY) layer (eg, uplink reception signal processing and downlink transmission signal processing). In addition to performing baseband-related signal processing, the processor 1520 may control overall operation of the base station apparatus 1500.

The antenna unit 1512 may include one or more physical antennas, and when a plurality of antennas are included, may support MIMO (Multiple Input Multiple Output) transmission and reception. The transceiver 1514 may include a radio frequency (RF) transmitter and an RF receiver. The memory 1516 may store information processed by the processor 1520, software related to the operation of the base station apparatus 1500, an operating system, an application, and may include components such as a buffer.

The processor 1512 of the base station 1500 may be set to implement the operation of the base station in the embodiments described in the present invention.

The terminal device 1550 may include a processor 1570, an antenna unit 1562, a transceiver 1564, and a memory 1566.

The processor 1570 performs baseband-related signal processing, and may include an upper layer processor 1580 and a physical layer processor 1590. The upper layer processor 1580 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processor 1590 may process operations of the PHY layer (eg, downlink reception signal processing and uplink transmission signal processing). In addition to performing baseband-related signal processing, the processor 1570 may control overall operation of the terminal device 1550.

The antenna unit 1562 may include one or more physical antennas, and if a plurality of antennas are included, MIMO transmission and reception may be supported. The transceiver 1564 may include an RF transmitter and an RF receiver. The memory 1566 may store information processed by the processor 1570 and software, an operating system, and applications related to the operation of the terminal device 1550, and may include components such as a buffer.

The processor 1570 of the terminal device 1550 may be set to implement the operation of the terminal in the embodiments described in the present invention.

In this case, as an example, the processor 1520 of the base station apparatus 1500 may transmit “TDD-UL-DL-ConfigurationCommon” commonly applied to the terminal apparatus 1550 through TDD through high-level signaling such as radio resource control (RRC). -UL-DL configuration information can be provided. In addition, as an example, the processor 1520 of the base station apparatus 1500 may provide “TDD-UL-DL-ConfigDedicated” applied only to a specific terminal apparatus 1550 through high-level signaling such as RRC. In addition, as an example, the processor 1520 of the base station apparatus 1500 may dynamically provide TDD-UL-DL configuration information to the terminal apparatus 1550 through DCI.

In addition, the processor 1570 of the terminal device 1550 may receive the first bitmap described above from the base station device 1500. The processor 1570 of the terminal device 1550 may obtain information on resource pool candidates based on Tms units through the first bitmap, and thereby determine resource pool candidates. Further, the processor 1570 of the terminal device 1550 may receive the second bitmap described above from the base station device 1500. The processor 1570 of the terminal device 1550 may acquire information on the final resource pool in Tms slots within the Tms through the second bitmap, thereby determining the resource pool.

Further, as an example, the processor 1520 of the base station apparatus 1500 may determine Tms, which is a unit for indicating a resource pool, based on a slot configuration cycle of the TDD-UL-DL configuration. Further, as an example, the processor 1520 of the base station apparatus 1500 may transmit the information on the first bitmap described above to the terminal apparatus 1550. The processor 1520 of the base station apparatus 1500 may instruct the terminal apparatus 1550 of information on resource pool candidates based on Tms units through the first bitmap described above. Further, as an example, the processor 1520 of the base station apparatus 1500 may transmit information about the second bitmap described above to the terminal apparatus 1550. The processor 1520 of the base station apparatus 1500 may instruct the terminal apparatus 1500 of information on the final resource pool in units of slots within Tms through the second bitmap.

In the operation of the base station apparatus 1500 and the terminal apparatus 1550, the matters described in the examples of the present invention may be equally applied, and overlapping descriptions are omitted.

Exemplary methods of the present disclosure are expressed as a series of operations for clarity of description, but are not intended to limit the order in which the steps are performed, and if necessary, each step may be performed simultaneously or in a different order. To implement the method according to the present disclosure, the steps illustrated may include other steps in addition, other steps may be included in addition to the other steps, or additional other steps may be included in addition to some of the steps.

The various embodiments of the present disclosure are not intended to list all possible combinations, but are intended to describe representative aspects of the present disclosure, and the details described in the various embodiments may be applied independently or in combination of two or more.

Further, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. For implementation by hardware, one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), Universal It can be implemented by a processor (general processor), a controller, a microcontroller, a microprocessor.

The scope of the present disclosure includes software or machine-executable instructions (eg, operating systems, applications, firmware, programs, etc.) that cause actions according to the methods of various embodiments to be executed on a device or computer, and such software or Instructions include a non-transitory computer-readable medium that is stored and executable on a device or computer.

The present invention can be applied when configuring a resource pool for a sidelink in a new radio (NR) system.

Claims

In the method of configuring a resource pool (Resource Pool) in the base station in the NR (New Radio) system,

Determining a first period corresponding to one bit in the first bitmap based on a slot configuration period of a time division duplex (TDD) uplink (UL) -downlink (DL) configuration;

Instructing resource pool candidates through the first bitmap based on the first period;

And indicating resource pools in each of the resource pool candidates through a second bitmap.