KR20220071917A - Method of transmitting traffic for ultra-reliable and low latency communication - Google Patents

Abstract

A method for transmitting traffic for ultra-reliable and low latency communication is disclosed. The method for transmitting traffic for ultra-reliable and low latency communication, in a traffic transmission method performed in a first base station, comprises the steps of: receiving interference beam information for a second base station from a first terminal; requesting an interference beam notification for one or more interference beams indicated by the interference beam information to the second base station; receiving the interference beam notification from the second base station; and allocating a scheduling margin of the first terminal based on the interference beam information and the interference beam notification.

Description

TRAFFIC TRANSMISSION METHOD FOR ULTRA-RELIABLE AND LOW LATENCY COMMUNICATION

The present application relates to a method of transmitting traffic in a communication system, and more particularly, a technology for efficiently transmitting traffic in a system supporting a high-reliability and low-latency communication service is about

With the development of mobile communication technology, 'high-speed, ultra-low latency, and hyper-connection' communication becomes possible, and services that utilize the advantages of 5G ( ^5th generation) mobile communication can be provided in places close to real life. In particular, Ultra-Reliable and Low Latency Communication (URLLC) is one of the main service scenarios of 5G mobile communication. Efficient communication with

On the other hand, it may be difficult to apply a Hybrid Automatic Repeat Request (HARQ) technique for highly reliable transmission in consideration of a delay time in a mobile communication system supporting the URLLC service. Therefore, there is a need for an efficient traffic transmission method that satisfies high reliability and low latency applicable to a mobile communication system supporting the URLLC service.

An object of the present application to solve the above problems is to provide a traffic transmission method for high reliability and low latency communication (Ultra-reliable and Low Latency Communication).

The traffic transmission method for high reliability and low delay communication according to the first embodiment of the present application for achieving the above object, the step of receiving the interference beam (beam) information for the second base station from the first terminal, the interference beam Requesting an interference beam notification for one or more interference beams indicated by information from the second base station, receiving the interference beam notification from the second base station, and based on the interference beam information and the interference beam notification and allocating a scheduling margin of the first terminal.

According to the present application, the serving base station (serving base station) can efficiently allocate the scheduling (scheduling) margin of the terminal for high-reliability and low-delay communication, and thus the transmission yield of the mobile communication system can be increased. have.

In addition, a signaling overhead for the serving base station to determine a scheduling margin may be reduced, and a delay time due to information exchange between the serving base station and an adjacent base station may be reduced.

1 is a conceptual diagram illustrating a first embodiment of a communication system.
2 is a conceptual diagram illustrating a first embodiment of components of a communication node included in a communication system;
3 is a first embodiment illustrating beams formed according to a beamforming technique using a large-scale antenna array.
4 is a flowchart illustrating a first embodiment of a procedure of a traffic transmission method for high reliability and low latency communication (Ultra-reliable and Low Latency).

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

Since the present application can make 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 application to a specific embodiment, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present application.

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 application, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term “and/or” includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When an element is referred to as being “connected” or “connected” to another element, it is understood that it may be directly connected or connected to the other element, but other elements 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 the other element does not exist 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 application. 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 this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Throughout the specification, a network is, for example, a wireless Internet such as WIFI, a wireless broadband internet (WiBro) or a portable Internet such as WiMax (world interoperability for microwave access), a global system for mobile communication (GSM), or a code (CDMA). 3G mobile communication network such as division multiple access) or CDMA2000, 3.5G (3.5th generation) mobile communication network such as high speed downlink packet access (HSDPA) or high speed uplink packet access (HSUPA), long term evolution (LTE) network or LTE - It may include a 4G (4th generation) mobile communication network, such as Advanced, 5G ( ^5th generation) mobile communication network and/or 6G (6th generation) mobile communication network.

Throughout the specification, a terminal refers to a mobile station, a mobile terminal, a subscriber station, a portable subscriber station, a user equipment, and an access terminal. and the like, and may include all or some functions of a terminal, a mobile station, a mobile terminal, a subscriber station, a portable subscriber station, a user device, an access terminal, and the like.

The above-mentioned terminal is a desktop computer capable of communication, a laptop computer, a tablet PC, a wireless phone, a mobile phone, a smart phone, a smart watch (smart watch), smart glass, VR glasses (virtual reality glass) e-book reader, PMP (portable multimedia player), portable game console, navigation device, digital camera, DMB (digital) multimedia broadcasting player, digital audio recorder, digital audio player, digital picture recorder, digital picture player, digital video player, etc. It may refer to various devices that can be used by a user of a mobile communication service.

Throughout the specification, a base station is an access point, a radio access station, a node B, an evolved node B, a base transceiver station, MMR - May refer to BS (Mobile Multi-hop Relay - Base Station), etc., and may include all or part of functions such as base station, access point, wireless access station, NodeB, eNodeB, transceiver base station, MMR-BS, etc. have.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application 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

Hereinafter, a 3GPP NR system as well as a 3GPP LTE/LTE-A system may be described as an example of a radio access system that can be used according to embodiments of the present application. Hereinafter, in order to clarify the description of the present application, the description is based on a 3GPP communication system (LTE, NR, etc.), but the technical spirit of the present application is not limited thereto.

The following techniques are code division multiple access (CDMA). It can be used in various access communication systems, such as frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA).

A communication system or a memory system to which embodiments according to the present invention are applied will be described. A communication system or a memory system to which embodiments according to the present invention are applied is not limited to the contents described below, and embodiments according to the present invention may 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 a first 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). A plurality of communication nodes 4G communication (eg, long term evolution (LTE), LTE-A (advanced)), 5G communication (eg, NR (new radio)) defined in the 3rd generation partnership project (3GPP) standard ) can be supported. 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. In addition, 6G communication may be performed at a frequency of a terahertz (THz) band.

For example, for 4G communication, 5G communication, and/or 6G communication, a plurality of communication nodes is a code division multiple access (CDMA) based communication protocol, a wideband CDMA (WCDMA) based communication protocol, time division multiple access (TDMA) 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.

On the other hand, 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) may each have the following structure.

2 is a block diagram illustrating a first embodiment of components of a communication node included in 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 of the components included in the communication node 200 may be connected by a bus 270 to communicate with each other.

However, each of the components included in the communication node 200 may not be connected to the common bus 270 but to the processor 210 through an individual interface or an individual bus. For example, the processor 210 may be connected to at least one of the memory 220 , the transceiver 230 , the input interface device 240 , the output interface device 250 , and the storage device 260 through a dedicated interface. .

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 application 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 stations 110-1, 110-2, 110-3, 120-1, 120-2 and terminals 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. have. 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, 120-2 is a NodeB (NodeB), an advanced NodeB (evolved NodeB), a 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 (transmission point), TRP ( transmission and reception point), eNB, gNB, small base station, small cell base station, femto cell base station, micro cell base station, picocell base station, etc. may be referred to as

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), IoT (Internet of Thing) It may be referred to as a device, a mounted device (such as a mounted module/device/terminal or on board device/terminal).

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 is via an ideal backhaul link or a non-ideal backhaul link. They may be connected to each other, and information may 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 a 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, the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) each of the multi-input multi-output (Multi Input Multio Output; MIMO) transmission (eg, a single user ( Single User; SU-MIMO, Multi-User; MU-MIMO, multi-cell MIMO, massive MIMO, etc.), Adaptive MIMO Switching (AMS), Coordinated Multi-Point transmission and reception (CoMP), carrier aggregation (CA) transmission, transmission in an unlicensed band, direct communication between terminals (Device-to-Device communication; D2D communication) (or, Proximity Services (ProSe)) and the like may be supported. 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. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 is a terminal 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, at least one of the base stations 110-1, 110-2, and 110-3 performs all functions of a communication protocol (eg, a remote radio transmission/reception function, a baseband processing function). can do. 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 method of the communication protocol is applied, the TRP may selectively perform some functions of the BBU or some functions of medium access control (MAC)/radio link control (RLC).

Hereinafter, methods for setting and managing a wireless interface in a communication system will be described. Even when a method (eg, transmission or reception of a signal) performed in a first communication node among communication nodes is described, a corresponding second communication node is a method (eg, a method corresponding to the method performed in the first communication node) For example, reception or transmission of a signal) may be performed. That is, when the operation of the terminal is described, the corresponding base station may perform the operation corresponding to the operation of the terminal. Conversely, when the operation of the base station is described, the corresponding terminal may perform the operation corresponding to the operation of the base station.

With the development of mobile communication technology, 'high-speed, ultra-low latency, and hyper-connection' communication becomes possible, and services that utilize the advantages of 5G ( ^5th generation) mobile communication can be provided in places close to real life. In particular, high-reliability and low-latency communication (URLLC), one of the main service scenarios of 5G mobile communication system, is 99.999% (five-nines) within a transmission delay of several ms (millisecond) or less depending on the application field. ) to 99.9999999% (nine-nines) may require transmission reliability.

In order to efficiently transmit traffic while ensuring high reliability, accurate measurement and/or reporting of an interference signal generated from an adjacent base station as well as measurement and/or reporting of a received signal from a serving base station may be required. However, whether or not the interference signal is generated may be determined according to scheduling of a neighboring base station, and it may be difficult to accurately predict the magnitude of the instantaneous interference signal. In addition, when a beamforming technique using a large-scale antenna array is applied to a mobile communication system, the variability of the interference signal may further increase.

On the other hand, a mobile communication system that provides a service that is not sensitive to delay applies the HARQ (Hybrid Automatic Repeat Request) technique to perform retransmission opportunistically depending on the success or failure of traffic transmission, thereby ensuring high reliability and efficient traffic transmission. can However, in the case of a mobile communication system that provides a URLLC service, it may be difficult to apply the HARQ technique because it must simultaneously satisfy the requirements for high-reliability and low-delay transmission.

Accordingly, the URLLC service can satisfy the requirements of the URLLC service by allocating a scheduling margin in consideration of the size of an interference signal that may be generated by an adjacent base station. The scheduling margin may mean a margin of transmission power. However, the transmission yield of the mobile communication system may decrease in proportion to the scheduling margin. Accordingly, there is a need for an efficient URLLC traffic transmission method in order to reduce the reduction in the transmission yield of the mobile communication system while satisfying the requirements of the URLLC service.

3 is a first embodiment illustrating beams formed according to a beamforming technique using a large-scale antenna array.

Referring to FIG. 3 , according to a beamforming technique using a large-scale antenna array, the serving base station 310 may use a plurality of beams 311 , 312 , 313 , and 314 , and the adjacent base station 320 may also use a plurality of beams 321 . , 322, 323, 324) can be used. The beamforming technique using a large-scale antenna array can improve the signal quality of the serving base station 310 and reduce the influence of an interference signal from an adjacent base station. However, since the directional beams 311 , 312 , 313 , 314 of the serving base station formed using the antenna array increase the received signal size of the terminal located in the directing direction, the location of the terminal 330 and the adjacent base station 320 are used Depending on the directing direction of the beams 321 , 322 , 323 , and 324 , larger interference may be generated.

In this case, if the scheduling margin is allocated based on the largest interference signal that may be generated from the adjacent base station 320 for the high reliability requirement of URLLC traffic, the transmission yield of the mobile communication system may be greatly reduced. Accordingly, the serving base station 310 determines the size of the beams 321 , 322 , 323 , 324 used by the adjacent base station 320 and/or the interference caused by the aforementioned beams and allocates a scheduling margin for transmission of the mobile communication system. A decrease in yield can be prevented.

The serving base station 310 may receive information on the beams 321 , 322 , 323 , and 324 used by the adjacent base station 320 and/or interference measurement for the aforementioned beams. The serving base station 310 increases a scheduling margin when a beam generating interference of a predetermined size or more is used in the neighboring base station 320 based on the information on the above-described beams and/or the interference measurement information on the above-mentioned beams. can Accordingly, the serving base station 310 may not significantly decrease the transmission yield according to the scheduling margin while satisfying the requirements of the URLLC service.

On the other hand, the serving base station 310 may receive information on the beams 321 , 322 , 323 , 324 used by the adjacent base station 320 after the scheduling of the adjacent base station 320 is completed, and accordingly, traffic transmission is delayed. In this case, it may not be able to meet the low latency requirement of URLLC service. In addition, when the serving base station 310 periodically reports the magnitude of interference by all beams 321 , 322 , 323 , 324 used in the adjacent base station 320 from the terminal 330, signaling overhead ( signaling overhead) may increase significantly. Accordingly, a method of setting an efficient scheduling margin for URLLC traffic transmission may be considered.

(예를 들어,

)를 측정할 수 있다. 또한, 상술한 빔들 각각에 대한 간섭의 크기

를 원소로 하는 간섭 크기 집합이 구성될 수 있다. 상술한 간섭의 크기

는 인접 기지국(320)이 사용하는 빔들의 지향 방향에 따라 아래의 간섭 크기 집합의 원소 중 하나의 값을 가질 수 있다.The terminal 330 determines the amount of interference caused by each of at least one beam (eg, 321 , 322 , 323 , 324 ) used by the adjacent base station 320 .

(for example,

) can be measured. In addition, the magnitude of interference for each of the above-described beams

A set of interference magnitudes may be constructed with . the magnitude of the aforementioned interference

may have one of the elements of the following interference magnitude set according to the directing direction of beams used by the neighboring base station 320 .

는 인접 기지국(320)이 사용하는 k 번째 빔에 의한 간섭의 크기를 의미할 수 있으며, N은 인접 기지국(320)이 사용하는 빔들의 전체 개수를 의미할 수 있다. 상술한 수학식 1의 간섭 크기 집합

이 내림차순으로 정렬된 경우, 인접 기지국(420)이 사용하는 k번째 빔에 의한 간섭의 크기

는 아래의 수학식 2를 만족할 수 있다.Here, k may refer to the k-th beam used by the neighboring base station 320,

may mean the amount of interference caused by the k-th beam used by the adjacent base station 320 , and N may mean the total number of beams used by the adjacent base station 320 . The interference magnitude set of Equation 1 above

In the case of sorting in descending order, the magnitude of interference by the k-th beam used by the neighboring base station 420

may satisfy Equation 2 below.

는

을 만족할 수 있으며,

는

을 만족할 수 있다. 또한, 여기서

은 단말(330)이 서빙 기지국(310)으로 보고할 인접 기지국(320)의 빔을 판단하기 위하여 미리 결정된 간섭의 크기의 상대적인 기준값을 의미할 수 있다. 서빙 기지국(310)은 상위계층 제어정보(예를 들어, 시스템 정보 및/또는 RRC 메시지)를 통해 단말(330)에

을 설정할 수 있으며, 단말(330)은 자체적으로

을 결정할 수도 있다.here,

Is

can be satisfied,

Is

can be satisfied Also, here

may mean a relative reference value of the predetermined interference magnitude in order for the terminal 330 to determine the beam of the neighboring base station 320 to be reported to the serving base station 310 . Serving base station 310 through higher layer control information (eg, system information and / or RRC message) to the terminal 330

can be set, and the terminal 330

may decide

As an embodiment, the magnitude of interference caused by beams used by the adjacent base station 320 is determined by a synchronization signal and/or a reference signal received by the terminal 330 from the serving base station 310 . can be measured.

및/또는 상술한 빔들의 인덱스(index)를 서빙 기지국(310)에 보고할 수 있다. 이하에서는, 인접 기지국(320)이 사용하는 빔들에 의한 간섭 크기 측정 결과에 따른 간섭 크기 집합

및/또는 상술한 빔들의 인덱스(index)를 간섭 빔 정보라 지칭할 수 있다.The terminal 330 may measure the magnitude of interference by beams used by the neighboring base station 320 , and the terminal 330 sets the interference magnitude according to the result of measuring the magnitude of interference by the above-described beams.

and/or an index of the above-described beams may be reported to the serving base station 310 . Hereinafter, an interference magnitude set according to a measurement result of interference magnitude by beams used by the adjacent base station 320

and/or an index of the aforementioned beams may be referred to as interference beam information.

의 원소 중 가장 작은 값을 가지는

및/또는

에 대응하는 빔 인덱스를 서빙 기지국(320)에 보고할 수 있다. 상술한 수학식 2에서

은

을 의미할 수 있다.In addition, the terminal 330 sets the size of the interference

has the smallest value among the elements of

and/or

A beam index corresponding to may be reported to the serving base station 320 . In Equation 2 above,

silver

can mean

의 원소 중

보다 작은 간섭의 크기 및/또는

보다 작은 간섭의 크기에 대응하는 빔 인덱스를 서빙 기지국(310)에 보고하지 않을 수 있다. 이 경우에,

은

과 같을 수 있다. 여기서,

은 단말(330)이 서빙 기지국(310)으로 보고할 인접 기지국(320)의 빔을 판단하기 위하여 미리 결정된 간섭의 크기의 절대적인 기준값을 의미할 수 있다. 서빙 기지국(310)은 상위계층 제어정보를 통해 단말(330)에

을 설정할 수 있으며, 단말(330)은 자체적으로

을 결정할 수도 있다.The terminal 330 sets the interference size

of the elements

a smaller magnitude of interference and/or

A beam index corresponding to a smaller interference magnitude may not be reported to the serving base station 310 . In this case,

silver

can be the same as here,

may mean an absolute reference value of a predetermined interference magnitude in order for the terminal 330 to determine the beam of the adjacent base station 320 to be reported to the serving base station 310 . The serving base station 310 to the terminal 330 through higher layer control information

can be set, and the terminal 330

may decide

When the serving base station 310 generates URLLC traffic to be transmitted to the terminal 330 , the serving base station 310 details the adjacent base station 320 based on the interference information of the adjacent base station 320 reported from the terminal 330 . An interference beam notification (or notification of an interference beam) for one or more interference beams indicated by one interference beam information may be requested. The above-mentioned interference beam notification determines whether there is a possibility of using a beam that causes large interference to the serving base station 310 within the transmission delay time allowed by the URLLC service requirements for one or more interfering beams indicated by the above-mentioned interference beam information. may mean a notification for

Even before the neighboring base station 320 itself completes scheduling for a terminal serviced by the adjacent base station 320, the adjacent base station 320 itself provides a serving base station ( 310), it is possible to determine the availability (or whether to use) of at least one beam generating large interference. The neighbor base station 320 may transmit an interference beam notification to the serving base station 310 based on the above-described availability determination result. The serving base station 310 may allocate a scheduling margin (eg, transmit power margin) of the terminal 330 based on the interference beam notification received from the adjacent base station 320 .

으로 할당할 수 있다. As an embodiment, when the serving base station 310 receives an interference beam notification indicating that there is a possibility of using at least one beam that can cause large interference from the neighboring base station 320, the serving base station 310 is A scheduling margin of the UE may be allocated based on the received interference beam notification and/or interference beam information. For example, the serving base station 310 may allocate the scheduling margin of the terminal 330 in consideration of a beam having the largest interference magnitude among beams used by the adjacent base station 320 . On the other hand, when the serving base station 310 receives an interference beam notification indicating that there is no possibility of using at least one beam that may cause large interference from the neighboring base station 320, the serving base station 310 receives the terminal ( 330) scheduling margin

can be assigned as

Figure 4 is a flow chart showing a first embodiment of the procedure of the traffic transmission method for high reliability and low latency service. The terminal, the serving base station, and the adjacent base station of FIG. 4 may refer to the terminal 330 , the serving base station 310 and the adjacent base station 320 of FIG. 3 , respectively.

를 측정할 수 있다(S402). Referring to FIG. 4 , the adjacent base station may form a plurality of beams to transmit a synchronization signal and/or a reference signal to the terminal ( S401 ). The terminal is the level of interference with at least one signal received from a neighboring base station

can be measured (S402).

및/또는 간섭의 크기의 절대적인 기준값인

을 설정할 수도 있다(S403). 단말은 수신한 신호들에 대한 간접 측정을 기반으로 서빙 기지국에 간섭 빔 정보를 보고할 수 있다(S404). 서빙 기지국이 단말에 전송할 트래픽이 발생한 경우에(S405), 서빙 기지국은 간섭 빔 정보에 의해 지시되는 하나 이상의 간섭 빔들에 대한 간섭 빔 알림을 인접 기지국에 요청할 수 있다(S406). 서빙 기지국으로부터 간섭 빔 알림을 요청받은 인접 기지국은 자신이 서비스하는 단말의 트래픽 버퍼 상태를 참조하여 간섭 빔 정보에 의해 지시되는 하나 이상의 간섭 빔들에 대한 사용 여부를 판단할 수 있다(S407). 인접 기지국은 상술한 사용 여부 판단에 기반하여 서빙 기지국에 간섭 빔 알림을 전송할 수 있다(S408). 인접 기지국으로부터 간섭 빔 알림을 수신한 서빙 기지국은 상술한 간섭 빔 알림 및/또는 상술한 간섭 빔 정보를 참조하여 단말의 스케줄링 마진을 할당할 수 있다(S409). 스케줄링 마진을 할당한 서빙 기지국은 단말에 트래픽을 전송하기 위하여 스케줄링을 할 수 있다(S410). 이에 따라, 서빙 기지국은 간섭 빔 알림 및/또는 간섭 빔 알림에 기반하여 효율적으로 단말의 스케줄링 마진을 할당하여 고신뢰 및 저지연 통신을 위한 스케줄링을 할 수 있다.At this time, the serving base station is a relative reference value of the amount of interference to the terminal through higher layer control information (eg, system information and/or RRC message).

and/or an absolute reference value of the magnitude of the interference.

may be set (S403). The terminal may report interference beam information to the serving base station based on indirect measurement of the received signals (S404). When the serving base station generates traffic to transmit to the terminal (S405), the serving base station may request an interference beam notification for one or more interference beams indicated by the interference beam information from the adjacent base station (S406). A neighboring base station receiving a request for an interference beam notification from the serving base station may determine whether to use one or more interference beams indicated by the interference beam information with reference to the traffic buffer status of the terminal it serves (S407). The neighboring base station may transmit an interference beam notification to the serving base station based on the above-described use determination (S408). The serving base station that has received the interference beam notification from the neighboring base station may allocate the scheduling margin of the terminal with reference to the above-described interference beam notification and/or the above-mentioned interference beam information (S409). The serving base station to which the scheduling margin is allocated may perform scheduling to transmit traffic to the terminal (S410). Accordingly, the serving base station can perform scheduling for high-reliability and low-delay communication by efficiently allocating the scheduling margin of the terminal based on the interference beam notification and/or the interference beam notification.

The operation of the method according to an embodiment of the present invention can be implemented as a computer-readable program or code on a computer-readable recording medium. The computer-readable recording medium includes all types of recording devices in which information readable by a computer system is stored. In addition, the computer-readable recording medium may be distributed in a network-connected computer system to store and execute computer-readable programs or codes in a distributed manner.

In addition, the computer-readable recording medium may include a hardware device specially configured to store and execute program instructions, such as ROM, RAM, and flash memory. The program instructions may 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.

Although some aspects of the invention have been described in the context of an apparatus, it may also represent a description according to a corresponding method, wherein a block or apparatus corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may also represent a corresponding block or item or a corresponding device feature. Some or all of the method steps may be performed by (or using) a hardware device such as, for example, a microprocessor, programmable computer or electronic circuit. In some embodiments, at least one or more of the most important method steps may be performed by such an apparatus.

In embodiments, a programmable logic device (eg, a field programmable gate array) may be used to perform some or all of the functions of the methods described herein. In embodiments, a field-programmable gate array may work with a microprocessor to perform one of the methods described herein. In general, the methods are preferably performed by some hardware device.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. You will understand that you can.

Claims (1)

In a traffic transmission method performed in a first base station,
Receiving interference beam (beam) information for a second base station from the first terminal;
requesting an interference beam notification for one or more interference beams indicated by the interference beam information from the second base station;
receiving the interference beam notification from the second base station; and
and allocating a scheduling margin of the first terminal based on the interference beam information and the interference beam notification.

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