KR20210098169A - Method and apparatus for scheduling in communication system - Google Patents

Abstract

Disclosed is a scheduling method in a communication system. In accordance with one embodiment of the present invention, a method for operating a terminal in a communication system may comprise the steps of: receiving a radio resource control (RRC) message for configuration information on a configured grant from a base station; receiving downlink control information (DCI) from the base station, receiving downlink data from the base station through a resource indicated by the DCI; and transmitting uplink data to the base station in the resource indicated by the configuration information on the configured grant when the downlink data includes information indicating that the configured grant is activated. Accordingly, the performance of the communication system can be improved.

Description

Scheduling method and apparatus in a communication system

The present invention relates to a scheduling method and apparatus in a deterministic communication system, and more particularly, to a method and apparatus for scheduling traffic in a deterministic communication system to which a time sensitive networking (TSN) technology is applied. .

With the development of information and communication technology, various wireless communication technologies are being developed. Representative wireless communication technologies include long term evolution (LTE) and new radio (NR) defined in 3rd generation partnership project (3GPP) standards. LTE may be one of 4G (4th Generation) wireless communication technologies, and NR may be one of 5G (5th Generation) wireless communication technologies.

4G communication system as well as a frequency band of a 4G communication system (eg, a frequency band of 6 GHz or less) for processing of wireless data that increases rapidly after commercialization of a 4G communication system (eg, a communication system supporting LTE) A 5G communication system (eg, a communication system supporting NR) using a frequency band higher than the frequency band of (eg, a frequency band of 6 GHz or more) is being considered. The 5G communication system may support enhanced Mobile BroadBand (eMBB), Ultra-Reliable and Low Latency Communication (URLLC), and Massive Machine Type Communication (mMTC).

In the NR group of 3GPP, standardization of time sensitive networking (TSN) technology is in progress. TSN technology is based on Ethernet to ensure low latency, low delay variation, and low packet loss to provide deterministic or deterministic network services. it's technology This TSN technology may be applied to an industrial internet of things (IIoT) system for factory automation or industrial automation.

The traffic of TSN applied to the IIoT system includes various types of communication such as periodic deterministic communication, aperiodic deterministic communication, non-deterministic communication, or mixed traffic. It can be applied to the type, and performance requirements and processing methods may vary depending on the communication type. In particular, in the case of periodic deterministic communication and aperiodic deterministic communication, since it can be widely applied to the industrial automation field, the development of TSN technology is required to improve the performance of the IIoT system by being applied to these types of communication.

SUMMARY OF THE INVENTION An object of the present invention to achieve the above needs relates to a method for scheduling traffic in a wireless communication system to which a time sensitive networking (TSN) technology is applied.

A method of operating a terminal in a communication system according to an embodiment of the present invention for achieving the above object, receiving a radio resource control (RRC) message for configuration information of a configured grant from a base station, a base station Receiving downlink control information (DCI) from In this case, the method may include transmitting uplink data to the base station in a resource indicated by the configuration information of the configuration grant.

As described above, according to the scheduling method according to an embodiment of the present invention, when the base station transmits downlink data to the terminal, the terminal transmits the uplink data to the base station after a _{preset response time (T d ) elapses.} A scheduling operation may be performed to do so. Accordingly, the requirements of the deterministic communication system to which the TSN technology is applied can be satisfied.

The setting grant set in an embodiment of the present invention may be a newly defined setting grant type 3 unlike the conventional setting grant type 1 or setting grant type 2 . The configuration information of the configuration grant according to the configuration grant type 3 may include a plurality of newly defined fields. Accordingly, it is possible to ensure that uplink data can be transmitted at a specified time with high reliability.

1 is a conceptual diagram illustrating an embodiment of a communication system.
2 is a block diagram illustrating an embodiment of a communication node constituting a communication system.
3 is a conceptual diagram for explaining an embodiment of a motion control system to which a deterministic communication system is applied.
4 is a flowchart illustrating an embodiment of a deterministic communication system.
5 is a flowchart for explaining an embodiment of a communication system according to the present invention.
6 is a conceptual diagram for explaining an embodiment of an uplink scheduling operation according to the present invention.
7 is a conceptual diagram for explaining an embodiment of a scheduling operation for a plurality of uplink data according to the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

A communication system to which embodiments according to the present invention are applied will be described. The communication system to which the embodiments according to the present invention are applied is not limited to the contents described below, and the embodiments according to the present invention can be applied to various communication systems. Here, a communication system may be used in the same sense as a communication network (network).

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In describing the present invention, in order to facilitate the overall understanding, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

1 is a conceptual diagram illustrating an embodiment of a communication system.

1, the communication system 100 is a plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). In addition, the communication system 100 is a core network (core network) (eg, S-GW (serving-gateway), P-GW (packet data network (PDN)-gateway), MME (mobility management entity)) may include more.

The plurality of communication nodes may support 4G communication (eg, long term evolution (LTE), advanced (LTE-A)), 5G communication, etc. defined in a 3rd generation partnership project (3GPP) standard. 4G communication may be performed in a frequency band of 6 GHz or less, and 5G communication may be performed in a frequency band of 6 GHz or more as well as a frequency band of 6 GHz or less. For example, a plurality of communication nodes for 4G communication and 5G communication is a CDMA (code division multiple access) based communication protocol, WCDMA (wideband CDMA) based communication protocol, TDMA (time division multiple access) based communication protocol, FDMA (frequency division multiple access) based communication protocol, OFDM (orthogonal frequency division multiplexing) based communication protocol, Filtered OFDM based communication protocol, CP (cyclic prefix)-OFDM based communication protocol, DFT-s-OFDM (discrete) Fourier transform-spread-OFDM) based communication protocol, OFDMA (orthogonal frequency division multiple access) based communication protocol, SC (single carrier)-FDMA based communication protocol, NOMA (Non-orthogonal multiple access), GFDM (generalized frequency) Division multiplexing)-based communication protocol, FBMC (filter bank multi-carrier)-based communication protocol, UFMC (universal filtered multi-carrier)-based communication protocol, SDMA (Space Division Multiple Access)-based communication protocol, etc. can be supported. . Each of the plurality of communication nodes may have the following structure.

2 is a block diagram illustrating an embodiment of a communication node constituting a communication system.

Referring to FIG. 2 , the communication node 200 may include at least one processor 210 , a memory 220 , and a transceiver 230 connected to a network to perform communication. In addition, the communication node 200 may further include an input interface device 240 , an output interface device 250 , a storage device 260 , and the like. Each component included in the communication node 200 may be connected by a bus 270 to communicate with each other.

The processor 210 may execute a program command stored in at least one of the memory 220 and the storage device 260 . The processor 210 may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. Each of the memory 220 and the storage device 260 may be configured as at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 220 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).

Referring back to FIG. 1 , the communication system 100 includes a plurality of base stations 110 - 1 , 110 - 2 , 110 - 3 , 120 - 1 and 120 - 2 , and a plurality of terminals 130 - 1, 130-2, 130-3, 130-4, 130-5, 130-6). base station (110-1, 110-2, 110-3, 120-1, 120-2) and terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) The comprising communication system 100 may be referred to as an “access network”. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may form a macro cell. Each of the fourth base station 120-1 and the fifth base station 120-2 may form a small cell. The fourth base station 120-1, the third terminal 130-3, and the fourth terminal 130-4 may belong to the cell coverage of the first base station 110-1. The second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 may belong to the cell coverage of the second base station 110-2. The fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 may belong to the cell coverage of the third base station 110-3. there is. The first terminal 130-1 may belong to the cell coverage of the fourth base station 120-1. The sixth terminal 130-6 may belong to the cell coverage of the fifth base station 120-2.

Here, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 is a NodeB, an evolved NodeB, gNB, ng-eNB, and BTS. (base transceiver station), radio base station (radio base station), radio transceiver (radio transceiver), access point (access point), access node (node), RSU (road side unit), RRH (radio remote head), TP ( It may be referred to as a transmission point), a transmission and reception point (TRP), a flexible (f)-TRP, and the like. Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, 130-6 is a user equipment (UE), a terminal, an access terminal, and a mobile Terminal (mobile terminal), station (station), subscriber station (subscriber station), mobile station (mobile station), portable subscriber station (portable subscriber station), node (node), device (device), Internet of things (IoT) It may be referred to as a device supporting a function, a mounted module/device/terminal, an on board unit (OBU), or the like.

Meanwhile, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in different frequency bands or may operate in the same frequency band. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to each other through an ideal backhaul link or a non-ideal backhaul link. , information can be exchanged with each other through an ideal backhaul link or a non-ideal backhaul link. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to the core network through an ideal backhaul link or a non-ideal backhaul link. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits a signal received from the core network to the corresponding terminals 130-1, 130-2, 130-3, 130 -4, 130-5, 130-6), and the signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) is transmitted to the core network can be sent to

In addition, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits MIMO (eg, single user (SU)-MIMO, multi user (MU)- MIMO, massive MIMO, etc.), CoMP (coordinated multipoint) transmission, CA (carrier aggregation) transmission, transmission in an unlicensed band, direct communication between terminals (device to device communication, D2D) (or ProSe ( proximity services)), and the like. Here, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, 130-6 is the base station 110-1, 110-2, 110-3, and 120-1. , 120-2) and corresponding operations, and operations supported by the base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be performed. For example, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 based on the SU-MIMO method, and the fourth terminal 130-4 may transmit a signal based on the SU-MIMO method. A signal may be received from the second base station 110 - 2 . Alternatively, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 based on the MU-MIMO scheme, and the fourth terminal 130-4. and each of the fifth terminals 130 - 5 may receive a signal from the second base station 110 - 2 by the MU-MIMO method.

Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may transmit a signal to the fourth terminal 130-4 based on the CoMP scheme, and the fourth The terminal 130-4 may receive signals from the first base station 110-1, the second base station 110-2, and the third base station 110-3 by the CoMP method. A plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) each of the terminals (130-1, 130-2, 130-3, 130-4) belonging to its own cell coverage , 130-5, 130-6) and the CA method can transmit and receive signals. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 controls D2D between the fourth terminal 130-4 and the fifth terminal 130-5. and each of the fourth terminal 130-4 and the fifth terminal 130-5 may perform D2D under the control of the second base station 110-2 and the third base station 110-3, respectively. .

Meanwhile, in a communication system, a base station may perform all functions of a communication protocol (eg, a remote radio transmission/reception function, a baseband processing function). Alternatively, a remote radio transmission/reception function among all functions of a communication protocol may be performed by a transmission reception point (TRP) (eg, f(flexible)-TRP), and a baseband processing function among all functions of a communication protocol may be performed by a baseband unit (BBU) block. The TRP may be a remote radio head (RRH), a radio unit (RU), or a transmission point (TP). The BBU block may include at least one BBU or at least one digital unit (DU). A BBU block may be referred to as a “BBU pool”, a “centralized BBU”, or the like. The TRP may be connected to the BBU block through a wired fronthaul link or a wireless fronthaul link. A communication system composed of a backhaul link and a fronthaul link may be as follows. When the function split technique of the communication protocol is applied, the TRP may selectively perform some functions of the BBU or some functions of the MAC/RLC.

3 is a conceptual diagram for explaining an embodiment of a motion control system to which a deterministic communication system is applied.

Referring to FIG. 3 , time sensitive networking (TSN) technology guarantees low latency, low delay variation, and low packet loss based on Ethernet. It is a technology for providing a deterministic or deterministic network service. This TSN technology may be applied to an industrial internet of things (IIoT) system for factory automation or industrial automation.

The traffic of TSN applied to the IIoT system includes various types of communication such as periodic deterministic communication, aperiodic deterministic communication, non-deterministic communication, or mixed traffic. It can be applied to the type, and performance requirements and processing methods may vary depending on the communication type. In particular, in the case of periodic and aperiodic deterministic communication, since it can be widely applied to the industrial automation field, the development of TSN technology is required to improve the performance of the IIoT system by being applied to this type of communication.

The deterministic communication system may be applied to a motion control system. The motion control system is an embodiment of a factory automation (FA) system, and may refer to a system for controlling the position or movement of an apparatus using a specific actuator. Referring to FIG. 3 , the motion control system 300 may include a motion controller 310 , an actuator 320 , and a feedback sensor 330 .

The motion controller 310 may generate set points including items related to the position or movement of the device. The motion controller 310 may additionally set a feedback loop for precise control of the device. The motion controller 310 may send a command including the set point to the actuator 320 .

The actuator 320 is a device for output motion, and may operate according to a set point included in a command transmitted from the motion controller 310 . As actuator 320 is actuated, the motion control system or device may perform established processes. An actuator used in a motion control system may correspond to a hydraulic pump, a hydraulic pump, an air cylinder, an electric motor, a servomotor, or a linear actuator.

The feedback sensor 330 may measure a state of performing a process according to the operation of the actuator 320 , or a position or movement of a device. The feedback sensor 330 may transmit the measured values to the motion controller 310 . The measured values transmitted to the motion controller 310 may be used to set the feedback circuit. The feedback sensor 330 used in the motion control system may correspond to an optical encoder, a resolver, or Hall effect equipment.

In the case of the motion control system 300 to which the deterministic communication system is applied, from the point in time when the motion controller 310 transmits a command to the actuator 320 to the point in time when the motion controller 310 receives the measured values from the feedback sensor 330 . It is characterized in that the time interval is determined.

4 is a flowchart illustrating an embodiment of a deterministic communication system.

Referring to FIG. 4 , the deterministic communication system 400 may include a terminal 410 and a base station 420 . The terminal 410 may include the actuator 320 and the feedback sensor 330 described with reference to FIG. 3 . The base station 420 may include the motion controller 310 described with reference to FIG. 3 .

The base station 420 may transmit downlink (DL) data to the terminal 410 (S430). Downlink data transmitted from the base station 420 to the terminal 410 may include a command to be performed by the terminal 410 or a device included in the terminal 410 . For example, the downlink data transmitted in step S430 may include a command transmitted from the motion controller 310 to the actuator 320 described with reference to FIG. 3 . The terminal 410 may receive the transmitted downlink data.

The terminal 410 may transmit uplink (UL) data to the base station 420 (S440). The uplink data transmitted from the terminal 410 to the base station 420 may include a feedback response to the downlink data. For example, the uplink data transmitted in step S440 may include measurement values transmitted from the feedback sensor 330 described with reference to FIG. 3 to the motion controller 310 . The base station 420 may receive the transmitted uplink data.

In the case of the deterministic communication system 400 , from the time when the base station 420 transmits downlink data to the terminal 410 ( S430 ) to the time when the base station 420 receives the uplink data from the terminal 410 . It is characterized in that the time interval is fixed. That is, the base station 420 of the deterministic communication system 400 transmits the downlink data to the terminal 410 and then when a preset response time T _d elapses, the base station 420 will receive the uplink data from the terminal 410 . can

5 is a flowchart for explaining an embodiment of a communication system according to the present invention.

Referring to FIG. 5 , the communication system 500 according to the present invention may include a terminal 510 and a base station 520 . The base station 520 may be a gNB (gNodeB) base station used for NR communication. The configuration and features of the communication system 500 according to the present invention may be the same as or similar to those of the deterministic communication system 400 described with reference to FIG. 4 .

The base station 520 may transmit a radio resource control (RRC) message including configuration information of a configured grant (CG) to the terminal 510 ( S530 ). The terminal 510 may receive the RRC message transmitted from the base station 520 . The configuration grant according to the present invention may be defined as a configuration grant type 3 newly configured differently from the configuration grant type 1 or the configuration grant type 2 configured in the conventional NR communication system. The RRC message transmitted by the base station 520 may include configuration grant configuration information and logical channel ID (LCID) configuration information. The configuration grant configuration information and the LCID configuration information may be included in one RRC message, or may be included in a separate RRC message, respectively.

Hereinafter, an embodiment of a setting grant configuration information element according to the present invention will be described with reference to Table 1.

Referring to Table 1, the RRC message according to the present invention may include configuration information of a configuration grant. Specifically, the RRC information element included in the RRC message may include a ConfiguredGrantConfig information element. The ConfiguredGrantConfig information element may include a plurality of fields for configuring uplink transmission.

The ConfiguredGrantConfig information element may include a periodicity field, an rrc-ConfiguredUplinkGrant field, and the like. Here, the periodicity field may indicate periodicity in the configuration grant type 1 or the configuration grant type 2. Specifically, when uplink transmission is configured through configuration grant type 1 or configuration grant type 2, the UE may periodically transmit uplink data according to the value of the periodicity field after receiving downlink data. Meanwhile, the rrc-ConfiguredUplinkGrant field may include a plurality of detailed fields for configuring uplink transmission. Specifically, the rrc-ConfiguredUplinkGrant field may include a timeDomainOffset field. The timeDomainOffset field may indicate information on a point at which an uplink grant starts in the time domain. In addition, the ConfiguredGrantConfig information element may include a plurality of fields for configuring uplink transmission.

The configuration grant according to an embodiment of the present invention may be a newly defined configuration grant type 3 unlike configuration grant types 1 and 2 . The ConfigredGrantConfig information element according to the embodiment of the present invention may not use the periodicity field and the timeDomainOffset field. In addition, the ConfigredGrantConfig information element according to the embodiment of the present invention may include a newly defined set time offset (determinedTimeOffset) field. The set time offset field is a field defined for set grant type 3 and may indicate the number of a plurality of slots corresponding to the first set time. The first set time may be the same _{as a preset response time (T d} ) as a time required for uplink data to be transmitted after downlink data is transmitted in the deterministic communication system as described with reference to FIG. 4 . .

The communication system 500 according to the embodiment of the present invention may be a deterministic communication system, and thus, as described with reference to FIG. 4 , a preset response time (T _d ) after transmission of downlink data has elapsed. In this case, uplink transmission may be performed. The terminal 510 may transmit uplink data one-time whenever it receives downlink data. Here, unlike the prior art in which a plurality of uplink data transmissions occur periodically for one downlink data transmission according to the value of the periodicity field, in the embodiment of the present invention, one time for one downlink data transmission Only uplink data transmission can occur. Therefore, in the embodiment of the present invention, the value of the periodicity field as described above may not be used. In addition, in the embodiment of the present invention, the uplink data transmission time according to the downlink data reception may be determined according to the number of slots indicated by the set time offset field. That is, in the embodiment of the present invention, an uplink grant start point indication by timeDomainOffset as in the prior art may not be required. Accordingly, in the embodiment of the present invention, the value of the timeDomainOffset field as described above may not be used.

Hereinafter, an embodiment of the logical channel configuration information element according to the present invention will be described with reference to Table 2.

Referring to Table 2, the RRC message according to the present invention may include configuration information of a configuration grant. Specifically, the RRC information element included in the RRC message may include a LogicalChannelConfig information element. The LogicalChannelConfig information element may include a plurality of fields for logical channel configuration.

The LogicalChannelConfig information element may include a configuredGrantType1Allowed field. The configuredGrantType1Allowed field may indicate whether uplink data transmission according to the configured grant type 1 is possible. For example, if the value of the configuredGrantType1Allowed field is true, data transmission according to the configured grant type 1 may be performed.

The setting grant according to an embodiment of the present invention may be a newly set setting grant type 3 unlike the setting grant types 1 and 2 . The LogicalChannelConfig information element according to an embodiment of the present invention may include a newly defined configuredGrantType3Required field. The communication system according to the embodiment of the present invention may be a deterministic communication system, and therefore, the uplink data response according to the downlink data transmission should be guaranteed with high reliability. The configuredGrantType3Required field is a field defined for this purpose, and may indicate whether uplink data transmission according to the configured grant type 3 is essential. For example, if the value of the configuredGrantType3Required field is true, data transmission according to the configured grant type 3 may be essentially performed.

Referring back to FIG. 5 , the base station 520 may transmit a radio resource control (RRC) message including configuration information of a configured grant (CG) to the terminal 510 ( S530 ). The terminal 510 may receive the RRC message transmitted from the base station 520 . The setting information of the setting grant may include the setting grant configuration information element and the logical channel configuration information element described with reference to Tables 1 and 2. The configuration grant configuration information element and the logical channel configuration information element may be included together in a single RRC message, or may be included in separate RRC messages, respectively.

The configuration grant configuration information element included in the RRC message transmitted in step S530 is according to the configuration grant type 3 and may include a newly defined configuration time offset field. The terminal 510 may check the number of slots indicated by the configuration time offset field included in the received configuration grant.

The base station 520 may transmit downlink control information (DCI) to the terminal 510 (S540). The terminal 510 may receive the DCI transmitted from the base station 520 and may check scheduling information included in the DCI.

The base station 520 may transmit downlink (DL) data to the terminal 510 (S550). The terminal 510 may receive downlink data transmitted from the base station 520 . Here, when the LCID included in the received medium access control (MAC) service data unit (SDU) corresponds to the LCID in which the value of the configuredGrantType3Required field is true among the LCIDs set as RRC, downlink data is for deterministic communication. It may be confirmed that it is downlink data corresponding to the preset configuration grant type 3 . In this case, configuredGrantType3Required information may be stored in the HARQ entity. Accordingly, the setting grant according to the setting grant type 3 may be activated.

The terminal 510 may transmit uplink (UL) data as a response to the downlink data (S560). When the configuration grant for configuration grant type 3 is activated, the terminal 510 uplinks to the base station 520 when the number of slots indicated by the configuration time offset field elapses since the time when downlink data is received. data can be transmitted. Accordingly, the uplink data _{can be transmitted at a time point when a preset response time (T d} ) has elapsed after the downlink data is transmitted. When transmitting uplink data to the base station in step S560, the terminal 510 may transmit a hybrid automatic repeat request (HARQ) response to the downlink data received in step S550. Specifically, the terminal 510 may transmit a HARQ ACK if no error is detected in the received downlink data, and may transmit a HARQ NACK if an error is detected in the received downlink data.

As described in step S550, when the terminal 510 receives downlink data and a configuration grant according to configuration grant type 3 is activated, the base station 520 uses the resources set by the RRC message transmitted in step S530, It can be expected that the uplink data will be received when the response time (T _{d ) has elapsed.} Therefore, the base station 520 performs monitoring on the resource set by the RRC message transmitted in step S530 before and after the time when the _{preset response time (T d} ) elapses after transmitting downlink data in step S550, Uplink data transmitted from the terminal 510 may be received.

Thereafter, the base station 520 may transmit downlink data to the terminal 510 again (S570). The downlink data transmission operation in step S570 may be the same as or similar to the downlink data transmission operation in step S550 described above. Here, the communication system 500 may be periodic deterministic communication or aperiodic deterministic communication. When the communication system 500 is periodic deterministic communication, the base station 520 may transmit downlink data to the terminal 510 according to a predetermined period (S570). That is, the base station 520 may transmit downlink data to the terminal 510 every time a predetermined period elapses after transmitting the downlink data to the terminal 510 for the first time. In this case, the transmission of downlink data may be performed according to dynamic scheduling or semi-persistent scheduling (SPS). Meanwhile, when the communication system 500 is aperiodic deterministic communication, downlink data transmission may be performed according to dynamic scheduling. After receiving the transmitted downlink data, the terminal 510 may transmit the uplink data to the base station 520 when a _{preset response time T d elapses ( S580 ).} The uplink data transmission operation in step S580 may be the same as or similar to the uplink data transmission operation in step S560 described above.

6 is a conceptual diagram for explaining an embodiment of an uplink scheduling operation according to the present invention. Hereinafter, an embodiment of an uplink scheduling operation according to the present invention will be described with reference to FIGS. 5 and 6 .

According to the present invention, the terminal 510 may receive configuration information of the configuration grant, the configuration grant, and downlink (DL) data from the base station 520 . The UE may check a physical uplink shared channel (PUSCH) or resource allocated for transmission of uplink (UL) data based on the received configuration grant and values included in the configuration information.

The transmitted uplink data may be transmitted only once as a response to the received downlink data. In other words, the configuration grant for uplink data may be activated once. A determinedTimeOffset field included in the configuration information of the configuration grant may indicate the number of slots for determining the uplink data transmission time according to the downlink data transmission. The slot duration according to the number of slots indicated by the set time offset field may be the same _{as the preset response time T d described with reference to FIG. 5 .}

7 is a conceptual diagram for explaining an embodiment of a scheduling operation for a plurality of uplink data according to the present invention.

When a plurality of uplink data is generated from one terminal 510, some of the plurality of uplink data may be transmitted with priority. Determination of such priority may be performed according to a logical channel prioritization (LCP) procedure. For example, when normal uplink data (a) and uplink data (b) according to TSN traffic are generated together in the terminal 510, which uplink data is to be transmitted with priority may be determined according to the LCP. As described above, uplink data according to TSN traffic has a characteristic that it must be accurately transmitted at a specified time. Accordingly, the following logical channel selection procedure may be required in order for the uplink data (b) according to the TSN traffic to be transmitted at a designated time point (t(x)) without being pushed by the priority of the general uplink data (a).

In the logical channel selection procedure according to the present invention, it can be checked whether the configuredGrantType3Required information is included in the HARQ entity. As described with reference to FIG. 5 , when configuredGrantType3Required information is included in the HARQ entity, the configuration grant according to the configuration grant type 3 may be in an activated state. In this case, the logical channel according to the configuration grant type 3 may be selected first. In other words, when it is confirmed that the configuredGrantType3Required information is included in the HARQ entity, high priority may be given to uplink data (b) according to TSN traffic. Accordingly, uplink data (b) according to TSN traffic may be normally transmitted at a designated time point t(x). Meanwhile, when configuredGrantType3Required according to the present invention is not included in the HARQ entity, scheduling according to the conventional logical channel selection procedure may be performed.

As described above, according to the scheduling method according to an embodiment of the present invention, when the base station transmits downlink data to the terminal, the terminal transmits the uplink data to the base station after a _{preset response time (T d ) elapses.} A scheduling operation may be performed to do so. Accordingly, the requirements of the deterministic communication system to which the TSN technology is applied can be satisfied.

The setting grant set in an embodiment of the present invention may be a newly defined setting grant type 3 unlike the conventional setting grant type 1 or setting grant type 2 . The configuration information of the configuration grant according to the configuration grant type 3 may include a plurality of newly defined fields. Accordingly, it is possible to ensure that uplink data can be transmitted at a specified time with high reliability.

The methods according to the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the computer-readable medium may be specially designed and configured for the present invention, or may be known and available to those skilled in the art of computer software.

Examples of computer-readable media include hardware devices specially configured to store and carry out program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as at least one software module to perform the operations of the present invention, and vice versa.

Although it has been described with reference to the above embodiments, it will be understood by those skilled in the art that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. will be able

Claims (1)

In a method of operating a terminal in a communication system,
Receiving a radio resource control (RRC) message with configuration information of a configured grant from the base station;
Receiving downlink control information (DCI) from the base station;
receiving downlink data from the base station through the resource indicated by the DCI; and
When the downlink data includes information indicating that the configuration grant is activated, transmitting uplink data to the base station in a resource indicated by the configuration information of the configuration grant.

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