KR20220099502A - Method and apparatus for transmitting and receiving of integrated access and backhaul nodes - Google Patents

Abstract

The present invention discloses a method and an apparatus for transmitting and receiving integrated access and backhaul (IAB) nodes. An operation method of a first IAB node includes: a step of receiving information of power offset from a second IAB node; a step of deriving a first EPRE of a PDSCH transmitted by the second IAB node based on the power offset; a step of transmitting a first message requesting adjustment of transmission power of the PDSCH to the second IAB node; a step of receiving a second message containing information on the adjusted transmission power of the PDSCH from the second IAB node; and a step of deriving the adjusted EPRE of the PDSCH by applying the adjusted transmission power to the first EPRE. Therefore, the present invention can increase system capacity and minimize delay time.

Description

Method and apparatus for transmitting and receiving access backhaul integration node

The present invention relates to a transmission/reception technology of an access backhaul aggregation node, and more particularly, to a transmission/reception technology of an access backhaul aggregation node to support simultaneous transmission/reception operation of the access backhaul aggregation node.

4G (4th Generation) communication system (e.g., LTE (Long Term Evolution) communication system, LTE-A (Advanced) communication system) for the processing of rapidly increasing wireless data after the commercialization of the frequency band of the 4G communication system ( For example, a 5G (5th Generation) communication system (for example, NR (New Radio) communication system) 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).

Due to the need for higher data rates and capacity in such NR, the introduction of integrated access and backhaul (IAB) technology may be considered. In such an IAB environment, an IAB node may be composed of two elements: a distributed unit (IAB-DU) and a mobile terminal (IAB-MT).

The conventional IAB node may transmit/receive a signal using a half-duplex scheme in consideration of time division multiplexing (TDM) between the IAB-DU and the IAB-MT. Due to this, it may be necessary to allow simultaneous transmission and reception between IAB-DU and IAB-MT for the purpose of increasing the system capacity of the limited IAB node and minimizing the delay time. However, when simultaneous transmission and reception of IAB-DU and IAB-MT is allowed in this way, crosslink interference may be caused.

An object of the present invention to solve the above problems is to provide a method and apparatus for transmitting and receiving an access backhaul integrated node for efficiently supporting simultaneous transmission/reception operations of IAB-DU and IAB-MT.

The method of operating a first IAB node according to a first embodiment of the present invention for achieving the above object includes the steps of receiving information of a power offset from a second IAB node, and based on the power offset, the second IAB node Deriving a first EPRE of the transmitted PDSCH, transmitting a first message requesting adjustment of the transmit power of the PDSCH to the second IAB node, a second including information on the adjusted transmit power of the PDSCH receiving a message from the second IAB node, and deriving an adjusted EPRE of the PDSCH by applying the adjusted transmit power to the first EPRE.

The method of operating the first IAB node may further include performing communication with one or more other IAB nodes in consideration of the adjusted EPRE of the PDSCH transmitted by the second IAB node.

Communication with the one or more other IAB nodes may be a simultaneous transmit/receive operation.

The method of operating the first IAB node may further include receiving, from the second IAB node, information on one or more beams to which the adjusted transmission power is applied.

The information on the one or more beams may be TCI state information or RS resource index.

When information on a beam to which the adjusted transmit power is adjusted is not received, it may be estimated that the adjusted transmit power is applied to all beams of the first IAB node.

The first EPRE may be derived by applying the power offset to a second EPRE of a CSI-RS transmitted by the second IAB node, and information of the second EPRE may be received from the second IAB node.

Each of the first message and the second message may be a MAC CE.

The first message may include an adjustment value of the transmit power required by the first IAB node.

The second message may further include information on time resources to which the adjusted transmission power is applied, and the time resources may be configured in units of slots.

In a method of operating a second IAB node according to a second embodiment of the present invention for achieving the above object, information of a power offset used to derive a first EPRE of a PDSCH transmitted by the second IAB node is first Transmitting to an IAB node, receiving a first MAC CE requesting adjustment of the transmission power of the PDSCH from the first IAB node, and determining the adjusted transmission power of the PDSCH based on the first MAC CE and transmitting a second MAC CE including information on the adjusted transmit power of the PDSCH to the first IAB node, wherein the adjusted EPRE of the PDSCH transmits the adjusted transmit power to the first It can be derived by applying it to the EPRE.

The method of operating the second IAB node may further include transmitting information on one or more beams to which the adjusted transmission power is applied to the first IAB node.

The information on the one or more beams may be TCI state information or RS resource index.

The method of operating the second IAB node may further include transmitting information of a second EPRE of a CSI-RS transmitted by the second IAB node to the first IAB node, wherein the first EPRE is It can be derived by applying a power offset to the second EPRE.

The second MAC CE may further include information on a time resource to which the adjusted transmission power is applied, and the time resource may be configured in units of slots.

A first IAB node according to a third embodiment of the present invention for achieving the above object includes a processor, a memory in electronic communication with the processor, and instructions stored in the memory, the instructions being executed by the processor If , the commands cause the first IAB node to receive information of a power offset from a second IAB node, derive a first EPRE of a PDSCH transmitted by the second IAB node based on the power offset, and Transmitting a first MAC CE requesting adjustment of the transmit power of the PDSCH to the second IAB node, and receiving a second MAC CE including information on the adjusted transmit power of the PDSCH from the second IAB node, and and apply the adjusted transmit power to the first EPRE to cause deriving the adjusted EPRE of the PDSCH.

The instructions may be operable to further cause the first IAB node to perform communication with one or more other IAB nodes in view of the adjusted EPRE of the PDSCH transmitted by the second IAB node.

The instructions may be operable to further cause the first IAB node to receive, from the second IAB node, information of one or more beams to which the adjusted transmit power is applied.

The information on the one or more beams may be TCI state information or RS resource index.

When information on a beam to which the adjusted transmit power is adjusted is not received, it may be estimated that the adjusted transmit power is applied to all beams of the first IAB node.

According to the present invention, when the IAB node transmits a downlink signal to the terminal, power may be adjusted and transmitted in consideration of signal transmission/reception with a higher node. In this case, the IAB node may transmit a power-adjusted signal by applying the same power offset to all downlink signals transmitted to the UE. Alternatively, the IAB node may transmit the downlink signal to the terminal by adjusting the power for each beam. Alternatively, the IAB node may transmit the downlink signal to the terminal by adjusting the power for each channel or for each signal.

As described above, when the IAB node transmits the downlink signal to the terminal by controlling the power, cross interference can be alleviated when receiving the downlink signal from the upper node. In this way, cross interference can be mitigated when the IAB node receives a downlink signal from a higher node, and simultaneous transmission/reception between the IAB-DU and the IAB-MT may be possible. As a result, the IAB node can increase system capacity and minimize latency.

1 is a conceptual diagram illustrating a wireless interface protocol in a communication system.
2 is a conceptual diagram illustrating time resources in a communication system.
3 is a conceptual diagram illustrating a downlink frame reception timing and an uplink transmission timing.
4 is a conceptual diagram illustrating a resource grid in a communication system.
5 is a conceptual diagram illustrating an SS/PBCH block of a communication system.
6 is a flowchart illustrating a first embodiment of a random access procedure.
7 is a conceptual diagram illustrating a first embodiment of a mapping relationship between an SSB and an RO.
8 is a conceptual diagram illustrating a second embodiment of a mapping relationship between an SSB and an RO.
9 is a conceptual diagram illustrating a first embodiment of a QCL information transfer process through TCI state setting and indication.
10 is a conceptual diagram illustrating a TCI state activation/deactivation MAC CE structure for UE-specific PDSCH DMRS.
11 is a conceptual diagram illustrating a first embodiment of a TCI status indication MAC CE for a UE-specific PDCCH DMRS.
12 is a conceptual diagram illustrating a slot configuration according to a slot format in a communication system.
13 is a conceptual diagram illustrating a first embodiment of an IAB network.
14 is a block diagram illustrating a first embodiment of a separation structure of a central unit and a distributed unit in an IAB network.
15 is a flowchart illustrating a first embodiment of a procedure for determining whether an IAB-DU resource is used by an IAB node.
16 is a flowchart illustrating a first embodiment of a terminal capability reporting procedure.
17 is a conceptual diagram illustrating transmission power and signaling of an NR downlink channel/signal.
18A is a flowchart illustrating a first embodiment of a method for transmitting and receiving an access backhaul aggregation node in a communication system;
18B is a flowchart illustrating a second embodiment of a method for transmitting and receiving an access backhaul aggregation node in a communication system.
19 is a flowchart illustrating a first embodiment of a method for controlling power of an IAB node.
20 is a graph showing a first embodiment of power control information and power adjustment information.
21 is a graph showing a second embodiment of power control information and power adjustment information.
22 is a graph showing a third embodiment of power control information and power adjustment information.
23 is a graph showing a fourth embodiment of power control information and power adjustment information.
24 is a block diagram illustrating a first embodiment of an IAB-DU.
25 is a block diagram illustrating a first embodiment of IAB-MT.
26 is a block diagram illustrating a first embodiment of a communication node constituting a communication network.

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 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.

In embodiments of the present application, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B”. Also, in the embodiments of the present application, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B”.

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 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 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 is to be understood that this 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 or 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

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 wireless interface protocol in a communication system.

Referring to FIG. 1 , in a radio interface protocol of a communication system, a physical layer (PHY) 100 is a medium access control (MAC) layer 120 through transport channels 110 . ) can be associated with The physical layer 100 may transmit and receive control or measurement information to and from the radio resource control (RRC) layer 140 . The MAC layer 120 may be connected to a higher layer through logical channels 130 . In an embodiment, the physical layer 100 may be referred to as L1 (layer 1), and the MAC layer 120 and the RLC layer 140 may be referred to as higher layers. Alternatively, the MAC layer 120 may be referred to as layer 2 (L2) and the RLC layer 140 may be referred to as layer 3 (L3).

L1 signaling is "signaling of downlink control information (DCI) transmitted through a physical downlink control channel (PDCCH)", "signaling of uplink control information (UCI) transmitted through a physical uplink control channel (PUCCH)", and/or It may mean "signaling of sidelink control information (SCI) transmitted through a physical sidelink control channel (PSCCH)".

Higher layer signaling may mean "L2 signaling transmitted through MAC CE (control element)" and/or "L3 signaling transmitted through RRC signaling". Signaling between base stations, signaling for distributed unit (DU), signaling for central unit (CU), and/or signaling for elements constituting the base station (eg, F1, next generation (NG) interface) is higher It may be referred to as layer signaling. The air interface is an “interface between a user equipment (UE) and a base station (gNB)”, “an interface between an integrated access backhaul distributed unit (IAB-DU) and an integrated access backhaul mobile terminal (IAB-MT)”, “IAB -Interface between the DU and the terminal", "interface between terminals", etc. may be included.

) 및/또는 CP(cyclic prefix)에 기초하여 하향링크 BWP(downlink bandwidth part) 및 상향링크 BWP(uplink bandwidth part) 각각에 적용되는 뉴머롤러지(

)를 알 수 있다.On the other hand, the 5G communication system uses one or more of the numerologies of Table 1 for various purposes such as inter-carrier interference (ICI) according to frequency band characteristics and latency reduction according to service characteristics. it may be possible to According to the extension or change of the frequency band, a new neuron may be added to Table 1. The terminal is a parameter of the upper layer, subcarrier spacing (subcarrier spacing) (eg,

) and / or CP (cyclic prefix) based on the downlink BWP (downlink bandwidth part) and uplink BWP (uplink bandwidth part) Numerology applied to each (

) can be found.

CP 0 15 normal One 30 normal 2 60 normal, extended 3 120 normal 4 240 normal

2 is a conceptual diagram illustrating time resources in a communication system.

개의 서브프레임(subframe)(210)을 포함할 수 있다. 서브프레임(210)은

개의 슬롯(slot)(220)을 포함할 수 있다. 슬롯(220)은

(예를 들어, 14)개의 OFDM 심볼(symbol)들을 포함할 수 있다.

,

, 및

각각은 정규 CP가 사용되는 경우에 뉴머롤러지에 따라 표 2의 값으로 정의될 수 있다.

,

, 및

각각은 확장 CP가 사용되는 경우에 뉴머롤러지에 따라 표 3의 값으로 정의될 수 있다. 한 슬롯에 포함되는 심볼들 각각은 상위계층 시그널링에 의하여 DL(downlink) 심볼, FL(flexible) 심볼 또는 UL(uplink) 심볼로 설정될 수 있다. 또는, 슬롯에 포함되는 심볼들 각각은 상위계층 시그널링 및 L1 시그널링의 조합에 의하여 DL 심볼, FL 심볼 또는 UL 심볼로 설정될 수 있다.2, the frame 200 is

may include subframes 210 . The subframe 210 is

It may include a number of slots 220 . Slot 220 is

It may include (eg, 14) OFDM symbols.

,

, and

Each may be defined as a value in Table 2 according to the pneumologic in the case where a regular CP is used.

,

, and

Each may be defined as a value in Table 3 according to the pneumologic in the case in which the extended CP is used. Each of the symbols included in one slot may be configured as a downlink (DL) symbol, a flexible (FL) symbol, or an uplink (UL) symbol by higher layer signaling. Alternatively, each of the symbols included in the slot may be set as a DL symbol, FL symbol, or UL symbol by a combination of higher layer signaling and L1 signaling.

0 14 10 One One 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

2 12 40 4

In the 5G communication system, the frame 200 may have a length of 10 ms, and the subframe 210 may have a length of 1 ms. The frame 200 may be divided into two half-frames (eg, half frames #0 and #1) having the same length. Half frame #0 may include subframes #0 to #4, and half frame #1 may include subframes #5 to #9. In one carrier, a set of frames for uplink and a set of frames for downlink may exist.

3 is a conceptual diagram illustrating a downlink frame reception timing and an uplink transmission timing.

로 설정될 수 있다. 5G 통신 시스템에서, T_C는

로 정의될 수 있고,

는 480KHz일 수 있고, N_f는 4096일 수 있고, N_TA,offset은 L3 시그널링에 의해 설정되는 값일 수 있고, N_TA는 L2 시그널링에 의해 지시되는 T_A에 의하여 아래 수학식 1과 같이 결정될 수 있다. N_TA,offset 및 N_TA는 특정 상황에 대한 예시일 수 있고, 다른 값으로 설정될 수 있다.Referring to FIG. 3 , a time difference between the reception timing of the downlink frame #i 300 and the transmission timing of the uplink frame #i 310 may be T _TA . The terminal may start transmission of the uplink frame #i (310) at a time earlier by T _TA than the reception start time of the downlink frame #i (300). T _TA may be referred to as timing advance or timing adjustment (TA). The base station may instruct the terminal to change the T _TA through higher layer signaling or L1 signaling. For example, T _TA is

can be set to In 5G communication system, T _C is

can be defined as

may be 480KHz, N _f may be 4096, N _TA,offset may be a value set by L3 signaling, and N _TA may be determined as in Equation 1 below by T _A indicated by L2 signaling. have. N _TA,offset and N _TA may be examples for a specific situation, and may be set to different values.

4 is a conceptual diagram illustrating a resource grid in a communication system.

개의 서브캐리어들과

개의 OFDM 심볼들로 구성될 수 있다. 자원 그리드는 뉴머롤러지 및/또는 캐리어 별로 정의할 수 있다. Referring to FIG. 4 , a resource grid of a communication system is

with subcarriers

It may be composed of OFDM symbols. The resource grid may be defined for each neurology and/or carrier.

는 상위계층 시그널링으로 지시되는 공통 자원 블록(common resource block, CRB) 위치일 수 있다.

는 CRB로부터 시작되는 자원 블록(resource block, RB)(400)의 개수(예를 들어, 캐리어 대역폭)을 의미할 수 있다.

may be a common resource block (CRB) location indicated by higher layer signaling.

may mean the number (eg, carrier bandwidth) of resource blocks (RBs) 400 starting from the CRB.

)의 설정을 위한 자원 그리드 내의 각 요소(element)는 자원 요소(resource element, RE)(410)로 지칭될 수 있다. 자원 요소(410)는

위치마다 고유하게 정의될 수 있다. 이때, k는 주파수 도메인에서 서브캐리어 인덱스일 수 있고, l은 시간 도메인에서 심볼 인덱스일 수 있다.

는 물리 채널 혹은 시그널 복소수 값

를 전송하는데 사용하는 물리 자원에 대응될 수 있다. 하나의 자원 블록(400)은 주파수 도메인에서 연속된

개의 서브캐리어들을 포함할 수 있다.The above-described parameters may be set differently for each link direction (eg, uplink, downlink, sidelink) and/or for each neurology. Numerology may mean a subcarrier spacing. Antenna port (p) and subcarrier spacing (

), each element in the resource grid for setting may be referred to as a resource element (RE) 410 . The resource element 410 is

Each location can be uniquely defined. In this case, k may be a subcarrier index in the frequency domain, and l may be a symbol index in the time domain.

is a physical channel or signal complex value

may correspond to a physical resource used to transmit One resource block 400 is continuous in the frequency domain.

may include subcarriers.

)와 해당 대역폭 부분을 구성하는 자원 블록의 수(

)는 수학식 2와 수학식3을 만족할 수 있다.In the 5G communication system, the concept of a bandwidth portion may be introduced in order to reduce high terminal implementation complexity and/or power consumption due to the widened carrier bandwidth. One bandwidth portion may include contiguous common resource blocks, and the starting resource block position (

) and the number of resource blocks that make up the corresponding bandwidth portion (

) may satisfy Equations 2 and 3.

Up to four downlink bandwidth portions in one component carrier (CC) may be configured in the UE, and only one downlink bandwidth portion may be activated at a time. The UE does not receive channels and/or signals (eg, physical downlink shared channel (PDSCH), physical downlink control channel (PDCCH), channel state information reference signal (CSI-RS), etc.) other than the active downlink bandwidth portion. it may not be Up to four uplink bandwidth portions in one component carrier may be configured in the terminal, and only one uplink bandwidth portion may be activated at a time. The UE may not transmit a channel and/or a signal (eg, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), a sounding reference signal (SRS), etc.) other than the active uplink bandwidth portion.

5 is a conceptual diagram illustrating a synchronization signal/physical broadcast channel block (SS/PBCH) block of a communication system.

Referring to FIG. 5 , the SS/PBCH block may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH. The PSS may be transmitted on 12 RBs in the first symbol of the SS/PBCH block. The SSS may be transmitted on 12 RBs in the third symbol of the SS/PBCH block. The PBCH may be transmitted in the second symbol, the third symbol, and the fourth symbol of the SS/PBCH block. In the second and fourth symbols, the PBCH may be transmitted through 20 RBs. If 15 kHz SCS is used, the size of 20 RBs may be 3.6 MHz. The base station may transmit one SSB using the same beam.

When a plurality of beams are used (eg, when the number of antennas of the base station increases, when one or more analog beams are used to support a high frequency), the base station may transmit a plurality of SSBs using multiple beams. The beam may be represented by transmission precoding, a spatial transmission filter, a transmission configuration indication (TCI), and the like. For example, the base station may transmit a plurality of SSBs 530 , 540 , 550 , and 560 using a plurality of beams (eg, beam #1, beam #2, beam #3, beam #4). In this case, it may be possible for one or more SSBs to be transmitted in one slot according to a predetermined pattern for each neurology. SSBs 530 , 540 , 550 , and 560 to which different beams are applied may be included in the SS burst 520 . The UE may assume a half-frame window having a length of 5 ms at the time of monitoring the SSB. The SS burst set 510 configured by higher layer signaling in the half frame may include one or more SS bursts 520 . In the initial access procedure, the UE may assume that the period of the SS burst set 500 is 20 ms when the RRC setting values are unknown or unavailable, and the SSB may be measured based on the above-mentioned assumption. have. For example, the UE may receive the SSB based on the SSB configuration information defined in Tables 4 and 5 below.

6 is a flowchart illustrating a first embodiment of a random access procedure.

Referring to FIG. 6 , in the random access procedure, the terminal may transmit a physical random access channel (PRACH) preamble (eg, Msg1) to the base station (S600). A random access-radio network temporary identifier (RA-RNTI) may be determined based on a transmission resource of the PRACH preamble. For example, RA-RNTI may be calculated by Equation (4).

In Equation 4, s_id may be an index of the first orthogonal frequency-division multiplexing (OFDM) symbol of a PRACH occasion (RO), and may be defined as 0≤s_id<14. t_id may be the first slot index of the PRACH operation in the system frame, and may be defined as 0≤t_id<80.

f_id may be an index of a PRACH operation in the frequency domain, and may be defined as 0≤f_id<8. ul_carrier_id may be a value according to an uplink carrier type used for PRACH preamble transmission. In the case of a regular uplink carrier, ul_carrier_id may be 0. In the case of a supplementary uplink carrier, ul_carrier_id may be 1. Before performing the random access procedure, the UE may receive system information from the SS/PBCH block received from the base station, and may check the following information element(s) included in the system information. Alternatively, before performing the random access procedure, the terminal may receive an RRC message from the base station, and may check the following information element(s) included in the RRC message.

- PRACH preamble format (preamble format)

- Time and frequency resource information for RACH (random access channel) transmission

- index to logical root sequence table

- cyclic shift (N _CS )

- set type (unrestricted, restricted set A, restricted set B)

Referring back to FIG. 6 , the base station may transmit a random access response (RAR) (eg, Msg2) to the terminal (S610). The base station may calculate the RA-RNTI based on Equation (4). DCI including scheduling information of Msg2 may be scrambled using RA-RNTI. DCI including scheduling information of Msg2 may be transmitted before step S610. The UE may perform a monitoring operation for the PDCCH (eg, DCI) using the RA-RNTI in the RACH response window set by the higher layer in the type 1 PDCCH common search space (CSS). If the PDCCH is successfully decoded, the UE may receive the RAR in the PDSCH indicated by the PDCCH. The UE that has successfully decoded the RAR may check whether an RA preamble identifier (RAPID) included in the RAR matches the RAPID of Msg1 transmitted by the UE to the base station.

When the RAPID included in the RAR matches the RAPID of Msg1, the UE may transmit Msg3 through the PUSCH (S620). The UE may determine a transmission scheme (eg, discrete Fourier transform (DFT)-s-OFDM or OFDM) of Msg3 based on a higher layer parameter (eg, msg3-transformPrecoding). Also, the UE may determine the SCS to be used in Msg3 transmission according to a higher layer parameter (eg, msg3-scs).

The base station may receive Msg3 from the terminal and may transmit a contention resolution message (eg, Msg4) to the terminal (S630). DCI scrambled by TC (temporary cell)-RNTI before step S630 may be transmitted, and the DCI may include scheduling information of Msg4. The UE may start a timer for receiving the contention resolution message, and may perform a monitoring operation for the PDCCH (eg, DCI) using the TC-RNTI in the Type 1 PDCCH CSS until the timer expires. When the DCI is successfully decoded, the UE may receive Msg4 in the PDSCH indicated by the DCI and may check the MAC CE included in the Msg4. The UE may set the TC-RNTI to C(cell)-RNTI. When Msg4 is successfully decoded, the UE may report a hybrid automatic repeat request (HARQ) acknowledgment (ACK) for Msg4 to the base station (S640).

On the other hand, the RACH error (RO) may mean time and frequency resources for transmission and reception of the PRACH preamble. The UE may transmit the PRACH preamble in the RACH operation. For multi-beam operation in the 5G communication system, each of the plurality of SSBs may be associated with a different beam.

The UE may measure multiple SSBs, and for the SSB, reference signal received power (RSRP), reference signal received quality (RSRQ), signal-to-noise ratio (SNR), and/or signal-to-noise (SINR). /interference ratio) may select an optimal SSB (eg, an optimal beam).

The UE determines the beam (eg, (TX) spatial filter) to be used for PRACH transmission based on the beam (eg, (RX) spatial filter) used when receiving the optimal SSB. can

A mapping relationship between the SSB and the RO may be established for the purpose of allowing the base station or the network to know which SSB (beam) the terminal has selected. The base station may check the SSB (eg, the beam selected by the terminal) mapped to the RO to which the PRACH of the terminal is transmitted based on the mapping relationship. The mapping relationship between the SSB and the RO may be determined based on higher layer parameter(s) defined in Tables 6 and 7 below.

7 is a conceptual diagram illustrating a first embodiment of a mapping relationship between an SSB and an RO.

Referring to FIG. 7 , when “msg1-FDM is 1 and ssb-perRACH-OccasionAndCB-PreamblesPerSSB is one”, one SSB may be mapped to one RO.

8 is a conceptual diagram illustrating a second embodiment of a mapping relationship between an SSB and an RO.

Referring to FIG. 8 , when “msg1-FDM is 2 and ssb-perRACH-OccasionAndCB-PreamblesPerSSB is two”, one SSB may be mapped to one RO. Meanwhile, the 5G communication system may support DCI formats as shown in Table 8.

DCI may contain downlink control information for one or more cells and may be connected to one RNTI. DCI may be encoded through the order of 1) information element multiplexing, 2) cyclic redundancy check (CRC) addition, 3) channel coding, and 4) rate matching.

The decoding operation for DCI may be performed in consideration of the above-described encoding operation. "It is said that DCI is associated with one RNTI" may mean "that CRC parity bits of DCI are scrambled by the RNTI".

DCI may include scheduling information for one or more PUSCHs in a specific cell. CRC of DCI format 0_1 may be scrambled with C-RNTI, configured scheduling-RNTI (CS-RNTI), semi-persistent CSI RNTI (SP-CSI-RNTI), or modulation coding scheme cell RNTI (MCS-C-RNTI). have.

DCI format 0_1 may include one or more of the following information elements.

□ DCI format identifier (Identifier for DCI formats) (1 bit): As an indicator indicating that it is a UL DCI format, it is always set to 0 in case of DCI format 0_1

□ Carrier indicator (Carrier indicator) (0 or 3 bits): An indicator indicating the CC scheduled by the corresponding DCI

□ DFI flag (0 or 1 bit): configuration grant downlink feedback information (CG-DFI) indicator

- If DCI format 0_1 is used for CG-DFI indication (when the DFI flag is 1), at least one of the following fields can be used:

□ HARQ-ACK bitmap (16 bits), the order of the bitmap for the mapping of the HARQ process index is the same as the HARQ process index is mapped from the MSB to the LSB of the bitmap in ascending order. In the bitmap, a bit set to 1 may indicate ACK, and a bit set to 0 may indicate NACK.

□ TPC command for scheduled PUSCH (2 bits)

□ All the remaining bits in format 0_1 are set to zero

- If DCI format 0_1 is not used for CG-DFI indication (when there is no DFI flag field or DFI flag field is 0), at least one of the following fields is used:

□ UL/SUL indicator (0 or 1 bit): supplementary UL indicator

□ Bandwidth part indicator (0, 1, or 2 bits): an indicator indicating a bandwidth part to be activated among uplink bandwidth parts configured for the terminal

□ Frequency domain resource assignment: an indicator for allocating frequency domain resources

□ time domain resource assignment: an indicator for allocating time domain resources

□ frequency hopping flag (0 or 1 bit): frequency domain hopping indicator

□ MCS (Modulation and coding scheme) (5 bits)

□ NDI (new data indicator): an indicator indicating whether data is new data or retransmission data

□ RV (redundancy version): an indicator indicating the RV value when channel coding is applied to data

□ HARQ process number (4 bits): HARQ process indicator assigned to scheduled data

□ TPC command for scheduled PUSCH (2 bits): TPC indicator

□ SRS resource indicator (resource indicator): aperiodic (aperiodic) SRS resource selection indicator

□ Precoding information and number of layers: An indicator for the number of precoding and transport layers to be used in PUSCH transmission

□ Antenna ports: an indicator for an uplink antenna port to be used for PUSCH transmission

□ SRS request: an indicator of whether to transmit aperiodic SRS

□ CSI request: indicator for whether to report channel state information and how to report it

□ PTRS-DMRS association: an indicator indicating the relationship between an uplink phase-noise tracking reference signal (PTRS) antenna port and a demodulation reference signal (DMRS) antenna port

□ DMRS sequence initialization value: an indicator for the DMRS sequence initialization value during OFDM-based uplink transmission

□ UL-SCH indicator (indicator): an indicator indicating whether the PUSCH includes an uplink shared channel (UL-SCH) (PUSCH not including UL-SCH must include CSI)

□ open-loop power control parameter set indication: an indicator indicating an open-loop power control parameter set (OPLC)

□ Priority indicator: uplink transmission priority indicator

□ Invalid symbol pattern indicator: An indicator indicating whether or not the invalid symbol pattern set to the upper layer is applied.

Meanwhile, the CRC of DCI format 1_1 may be scrambled with C-RNTI, CS-RNTI, or MCS-C-RNTI. DCI format 1_1 may include one or more information elements below.

□ DCI format identifier (identifier for DCI formats) (1 bit): As an indicator indicating that it is a DL DCI format, it is always set to 1 in the case of DCI format 1_1

□ Carrier indicator (0 or 3 bits): This is an indicator indicating the CC scheduled by the DCI.

□ bandwidth part indicator (bandwidth part indicator) (0, 1 or 2 bits): an indicator indicating a bandwidth part to be activated among downlink bandwidth parts configured for the terminal

□ Frequency domain resource assignment: an indicator for allocating frequency domain resources

□ time domain resource assignment: an indicator for allocating time domain resources

□ PRB bundling size indicator (bundling size indicator): an indicator indicating the PRB bundling type (static or dynamic) and size

□ Rate matching indicator: an indicator indicating a rate matching pattern set to an upper layer

□ ZP CSI-RS trigger: aperiodic zero-power CSI-RS application indicator

□ MCS, NDI, and RV fields for transport block 1

□ MCS, NDI, and RV fields for transport block 2

□ HARQ process number: HARQ process indicator to be allocated to scheduled data

□ Downlink assignment index: DAI indicator for HARQ-ACK codebook generation in TDD operation

□ TPC command for scheduled PUCCH (TPC command for scheduled PUCCH): Power control indicator for PUCCH transmission

□ PUCCH resource indicator (resource indicator): PUCCH resource indicator to transmit HARQ-ACK information for the allocated PDSCH or the determined PDSCH set

□ HARQ feedback timing indicator in PDSCH (PDSCH-to-HARQ_feedback timing indicator): Indicator for time domain offset between the allocated PDSCH and PUCCH transmission

□ Antenna port(s) (antenna port(s)): Antenna port indicator to be used for PDSCH transmission and reception

□ Transmission configuration indication: TCI information indicator to be used for PDSCH transmission and reception

□ SRS request: aperiodic SRS transmission indicator

□ DMRS sequence initial value (sequence initialization): an indicator of the DMRS sequence initialization value to be used for PDSCH transmission and reception

□ Priority indicator (priority indicator): PDSCH reception priority indicator.

A specific DCI format may be used to deliver the same control information to one or more terminals. For example, the CRC of DCI format 2_3 may be scrambled by TPC-SRS-RNTI. DCI format 2_3 may include one or more information elements below.

□ Block number 1, block number 2, to, block number B: This is an indicator indicating a resource region to which DCI format 2_3 is applied. The beginning of the block is set by the upper layer parameter startingBitOfFormat2-3 or startingBitOfFormat2-3SUL-v1530

- When the terminal in which the srs-TPC-PDCCH-Group is configured with type A does not have PUCCH and PUSCH or performs uplink transmission in which SRS power control is not tied to power control of PUSCH, one block is a higher layer can be set, and the fields below can be defined for the block

□ SRS request (0 or 2 bits): Aperiodic SRS transmission indicator

□ TPC command number 1, TCP command number 2, to, TPC command number N: Uplink power control indicator to be applied to the UL carrier indicated by cc-IndexInOneCC-Set

- When the terminal in which the srs-TPC-PDCCH-Group is configured with type B does not have PUCCH and PUSCH or performs uplink transmission in which SRS power control is not tied to the power control of PUSCH, one or more blocks are upper layer can be set, and the fields below can be defined for each of one or more blocks

□ SRS request (0 or 2 bits): Aperiodic SRS transmission indicator

□ TPC instruction (2 bits)

Meanwhile, a specific DCI format may be used to deliver the same control information to one or more terminals. For example, DCI format 2_0 having a CRC scrambled to SFI-RNTI is a slot format, a channel occupancy time (COT) duration, an available RB set, and/or a search space. It can be used to notify (notifying) set group switching (search space set group switching). DCI format 2_0 may include one or more information elements below.

- If slotFormatCombToAddModList is set,

□ Slot format indicator 1, slot format indicator 2, to slot format indicator N

- If availableRB-SetsToAddModList-r16 is set,

□ Available RB set indicator 1, available RB set indicator 2, to available RB set indicator N1

- If co-DurationsPerCellToAddModList-r16 is set,

□ COT duration indicator 2 to COT duration indicator N2

- If searchSpaceSwitchTriggerToAddModList-r16 is set,

□ Search space set group switching flag 1, search space set group switching flag 2, to, search space set group switching flag M

The size of DCI format 2_0 may be set within 128 bits. The size of DCI format 2_0 may be set by higher layer signaling.

DCI format 2_5 may be used to notify the availability of soft (soft) type resources of the IAB node. DCI format 2_5 having CRC scrambled by availability indicator-RNTI (AI-RNTI) may include the following information element(s).

□ Availability indicator 1, availability indicator 2, to availability indicator N

The size of DCI format 2_5 may be set within 128 bits. The size of DCI format 2_5 may be set by higher layer signaling. The UE may receive CORESET #0 and configuration information of a search space #0 defined in Table 9 below from the base station.

The UE may refer to the configuration information defined in Tables 10 to 12 below for cell-specific PDCCH monitoring.

The UE may refer to the configuration information defined in Table 13 below for UE-specific PDCCH monitoring.

The existence of one antenna port means a case in which a channel experienced by a symbol transmitted by the corresponding antenna port can be estimated or inferred from a channel experienced by another symbol through which the same antenna port is transmitted. can do.

When two different antenna ports are quasi co-located (QCL), the large-scale characteristic of a channel experienced by a symbol transmitted by one antenna port is estimated from a channel experienced by a symbol transmitted by another antenna port. Or it may mean a case that can be inferred. The large-scale characteristics of the channel include 'delay spread', 'Doppler spread', 'Doppler shift', 'average gain', 'average delay', It may mean at least one of 'spatial Rx parameters'.

QCL information has a large-scale characteristic that can be reused for reception of a corresponding signal when the large-scale characteristic of a channel cannot be accurately measured using only the corresponding signal because the time/frequency resource of a certain signal (QCL target RS) is not sufficient (that is, sufficient time It may be used to improve the channel measurement performance of the terminal by providing the terminal with information about another signal (QCL reference RS) (having a frequency resource). The NR communication system may support various types of QCL types as follows.

- QCL-Type (Type) A: {Doppler shift (Doppler shift), Doppler spread (Doppler spread), average delay (average delay), including delay spread (delay spread)}

- QCL-Type B: including {Doppler shift, Doppler spread}

- QCL-Type C: including {Doppler shift, average delay}

- QCL-Type D: including {Spatial Rx parameter}

9 is a conceptual diagram illustrating a first embodiment of a process of transmitting quasi co-located (QCL) information through transmission configuration information (TCI) state setting and indication.

{QCL-유형 A, QCL-유형 B, QCL-유형 C}). 두 번째 참조는 만약 존재하는 경우 QCL-유형 D일 수 있다(즉, qcl-유형 2 = QCL-유형 D).Referring to FIG. 9, in the process of transmitting QCL information through TCI state setting and indication, the base station reports a UE capability report and the maximum value defined in the standard (eg, 4, 8, 64, 128 depending on the frequency band). up to M TCI states may be set in the upper layer (RRC) of the terminal according to the number of dogs, etc. (S930). At this time, each TCI state setting (S900) is information about a signal or channel (QCL reference (S910)) that provides large-scale channel characteristics to a signal or channel (QCL target (S920)) referring to the corresponding TCI. may include. One TCI state setting (S900) may include up to two references (qcl-Type 1 and qcl-Type 2). In this case, the first reference may be one of QCL-type A, QCL-type B, and QCL-type C (ie, qcl-type 1

{QCL-Type A, QCL-Type B, QCL-Type C}). The second reference, if present, may be QCL-type D (ie qcl-type 2 = QCL-type D).

When the base station applies all the TCIs configured in RRC to the terminal in real time, the implementation complexity of the terminal may be greatly increased. Accordingly, the base station may transmit an activation message for some of the TCIs configured in RRC to the terminal through L2 signaling such as MAC CE (S940). In this case, the base station may activate TCI for a maximum of N (<M). The UE may receive a dynamic indication only for the activated TCI.

Thereafter, the base station may dynamically indicate to the terminal some of the activated N TCIs through L1 signaling such as the DCI 950 ( S950 ). The UE may apply the QCL information(s) indicated by the corresponding TCI at a predetermined timing after receiving the L1 signaling. And, the terminal may perform a reception operation for the corresponding signal or channel.

The TCI status indication step may include an RRC signaling step (S930), a MAC CE signaling step (S940), and a DCI signaling step (S950). Some of these steps may be omitted depending on the type of the QCL target RS. For example, the QCL target may be a PDSCH DMRS. And, one or more TCI states may be configured in RRC. In this case, the base station may indicate the TCI state using all the steps of FIG. 9 . Alternatively, the QCL target may be a PDSCH DMRS. And, a single TCI state may be set in the RRC. In this case, the base station may omit the MAC CE signaling step (S940) and the DCI signaling step (S950). Similarly, if the QCL target is the PDCCH DMRS, the base station may omit the DCI signaling step S940. Specifically, the UE may obtain configuration information for the TCI state and QCL information with reference to the RRC signaling of Table 14 below.

The base station may instruct the terminal to activate or deactivate some of the TCI states set in the RRC through MAC CE signaling. Alternatively, the base station may apply the TCI state indicated by the MAC CE to the QCL target RS. For example, the base station may use the following MAC CE signaling according to the type of the QCL target RS.

- TCI state activation/deactivation MAC CE for UE-specific PDSCH DMRS

- TCI status indication MAC CE for terminal specific PDCCH DMRS

- TCI state activation / deactivation MAC CE for enhanced (enhanced) UE-specific PDSCH DMRS

10 is a conceptual diagram illustrating a TCI state activation/deactivation media access control (MAC) control element (CE) structure for a UE-specific physical downlink shared channel (PDSCH) demodulation reference signal (DMRS).

Referring to FIG. 10 , the MAC CE may indicate activation or deactivation of a TCI state for UE-specific PDSCH DMRS. The first octet (Oct 1) of the MAC CE may include a COREST pool ID field 1010 , a serving cell ID field 1020 , and a BWP ID field 1030 . The second octet (Oct 2) to the N-th octet (Oct N) may include fields 1040 for Ti, which is a TCI state ID. The detailed meaning of each field may be as follows. Its size may vary.

- Serving cell (Serving cell) ID: a serving cell ID to which the corresponding MAC CE is applied.

- BWP ID: Bandwidth part ID to which the MAC CE is applied. It is possible to specify the bandwidth part in association with the BWP indication field (indication field) in the DCI.

- T _i : Can refer to TCI state ID i. If it is set to 0, it may mean that the TCI state of which the TCI state ID is i is deactivated. If it is set to 1, it may mean that the TCI state of which the TCI state ID is i is activated. TCI states activated by 1 may be sequentially mapped to TCI indication field code points in DCI.

- CORESET pool (pool) ID: If DCI scheduling the PDSCH can be monitored in CORESET that does not include the upper layer parameter coresetPoolIndex. In this case, the field can be ignored. Alternatively, DCI scheduling the PDSCH may be monitored in CORESET including the higher layer parameter coresetPoolIndex. In this case, the T _i instruction can be applied only when 'value of CORESET pool ID' and 'value of coresetPoolIndex of CORESET' match.

11 is a conceptual diagram illustrating a first embodiment of a TCI status indication MAC CE for a UE-specific physical downlink control channel (PDCCH) DMRS.

Referring to FIG. 11 , the TCI status indication MAC CE for the UE-specific PDCCH DMRS may include a serving cell ID field 1110 and a CORESET ID field 1120 in the first octet (Oct 1). The MAC CE may include a CORESET ID field 1130 and a TCI status ID field 1140 in the second octet (Oct 2). Its size may vary.

- Serving cell (serving cell) ID: a serving cell ID to which the corresponding MAC CE is applied.

- CORESET ID: may point to a control resource set to which the MAC CE is applied. When set to 0, CORESET set through controlResourceSetZero can point to CORESET #0.

- TCI status ID: may mean a TCI status ID indicated by the corresponding MAC CE.

The base station may set spatial relation information in an upper layer of the terminal to indicate uplink beam information. Here, the spatial relation information uses a spatial domain filter value used for transmission and reception of a reference signal (reference RS) for a spatial TX filter of uplink transmission of a target signal (target RS) of the spatial relation. It may mean a signaling structure promised to do so. The spatial reference RS may be a downlink signal such as SSB or CSI-RS. The spatial reference RS may be set to an uplink signal such as an SRS. In this case, the reference RS may be a downlink signal. In this case, the UE may use the spatial RX filter value used to receive the corresponding reference RS as a spatial TX filter for transmitting the corresponding spatial relation target RS. Alternatively, the reference RS may be an uplink signal. In this case, the UE may use the spatial TX filter value used to transmit the reference RS as the spatial TX filter for the spatial relation target RS transmission.

A signaling structure for spatial relationship information may vary depending on the type of target RS. For example, the target RS may be an SRS. In this case, the base station may perform RRC configuration for each SRS resource as shown in Table 15 below.

For example, the target RS may be an SRS. In this case, the base station may perform RRC configuration for each SRS resource as shown in Tables 16 and 17 below.

In a 5G communication system, one slot format may include a downlink symbol, an uplink symbol, and flexible symbols.

12 is a conceptual diagram illustrating a slot configuration according to a slot format in a communication system.

Referring to FIG. 12 , in the downlink dedicated slot 1200 , all symbols in the corresponding slot may be configured as downlink symbols 1215 according to the slot format. As another example, in the uplink dedicated slot 1205 , all symbols in the corresponding slot may be configured as uplink symbols 1220 according to the slot format. As another example, the downlink/uplink mixed slot 1210 may consist of some symbols in the corresponding slot as downlink symbols 1225 according to the slot format, and some other symbols as uplink symbols 1235 . can be configured. In this case, specific symbols of the mixed slot 1210 including all uplink symbols may be set or indicated as a guard period 1230 for helping downlink-uplink switching. The UE may not perform transmission/reception during the corresponding guard period 1230 .

In the 5G communication system, the base station can set the "slot format per slot" over one or more slots for each serving cell to the terminal through a higher layer parameter for common slot format setting (eg, tdd-UL-DL-ConfigurationCommon). . In this case, the higher layer parameter for common slot format configuration (eg, tdd-UL-DL-ConfigurationCommon) may include or refer to at least one of the following information.

임.□ reference subcarrier spacing: reference numerology

lim.

□ Pattern 1: This is the first pattern.

□ Pattern 2: This is the second pattern.

Here, pattern 1 or pattern 2 may include at least one of the following settings.

□ Slot setting period (dl-UL-TransmissionPeriodicity): It is the period P of slot setting expressed in msec unit.

임.□ Number of downlink dedicated slots (nrofDownlinkSlots): The number of slots composed only of downlink symbols.

lim.

임.□ Number of downlink symbols (nrofDownlinkSymbols): the number of downlink symbols

lim.

임.□ Number of uplink dedicated slots (nrofUplinkSlots): The number of slots composed only of uplink symbols

lim.

임.□ Number of uplink symbols (nrofUplinkSymbols): the number of uplink symbols

lim.

개의 슬롯을 포함할 수 있다. 이때 뉴머롤러지는

를 따를 수 있다. 또한 S개의 슬롯들 중 처음

개의 슬롯들은 하향링크 심볼만을 포함할 수 있고, 마지막

개의 슬롯들은 상향링크 심볼만을 포함할 수 있다. 이때 처음

개의 슬롯들 뒤의

개의 심볼들은 하향링크 심볼일 수 있다. 또한 마지막

개의 슬롯들 이전의

개의 심볼들은 상향링크 심볼일 수 있다. 해당 패턴에서 하향링크 심볼 또는 상향링크 심볼로 지정되지 않은 나머지 심볼들(즉,

개의 심볼들)은 플렉서블 심볼일 수 있다.The slot setting period P _msec of the first pattern is

It may include a number of slots. At this time, the neurology

can follow Also, the first of the S slots

Slots may include only downlink symbols, and the last

Slots may include only uplink symbols. At this time the first

behind the slots

The symbols may be downlink symbols. also last

before slots

The symbols may be uplink symbols. The remaining symbols that are not designated as downlink symbols or uplink symbols in the pattern (that is,

symbols) may be flexible symbols.

개의 슬롯들과 두 번째

개의 슬롯들을 포함할 수 있다. 이때 두 번째 패턴에서의 하향링크 심볼, 상향링크 심볼, 플렉서블 심볼의 위치 및 개수는 두 번째 패턴의 설정 정보들을 바탕으로 첫 번째 패턴의 설명을 참조하며 구성될 수 있다. 또한 두 번째 패턴이 설정되는 경우 단말은 P+P₂가 20msec의 약수일 것을 가정할 수 있다. 기지국은 전용 슬롯 포맷 설정용 파라미터(일 예로 tdd-UL-DL-ConfigurationDedicated)를 사용하여 공통 슬롯 포맷 설정용 파라미터(일 예로 tdd-UL-DL-ConfigurationCommon)에 의하여 단말에 설정된 심볼들 중 "플렉서블 심볼"에 해당하는 심볼들의 방향을 다음 정보들을 기반으로 재설정(override)할 수 있다.If the second pattern is set and the slot setting period of the second pattern is P ₂ , one slot setting period P+P ₂ msec composed of the synthesis of the first pattern and the second pattern is the first

Slots and the second

It may include slots. In this case, the positions and number of downlink symbols, uplink symbols, and flexible symbols in the second pattern may be configured with reference to the description of the first pattern based on the setting information of the second pattern. In addition, when the second pattern is configured, the UE may assume that P+P ₂ is a divisor of 20 msec. The base station uses a dedicated slot format configuration parameter (for example, tdd-UL-DL-ConfigurationDedicated) and a "flexible symbol The direction of symbols corresponding to " can be overridden based on the following information.

□ Slot Configuration Set (slotSpecificConfigurationsToAddModList): A set of slot configurations.

□ Slot index (slotIndex): an index of a slot included in the set of slot settings.

□ Symbol directions (symbols): The directions of the slot indicated by the slot index (slotIndex). If all symbol directions are downlink (symbols = allDownlink), all symbols in the corresponding slot are downlink symbols. If all symbol directions are uplink (symbols = allUplink), all symbols in the corresponding slot are uplink symbols. If the symbol directions are explicit (symbols = explicit), the number of downlink symbols (nrofDownlinkSymbols) provides the number of downlink symbols located in the first part of the corresponding slot. And, if the symbol directions are explicit (symbols = explicit), the number of uplink symbols (nrofUplinkSymbols) provides the number of downlink symbols located in the last part of the corresponding slot. If the number of downlink symbols (nrofDownlinkSymbols) or the number of uplink symbols (nrofUplinkSymbols) is omitted, the corresponding parameter may be regarded as indicating a value of 0. The remaining symbols in the slot become flexible symbols.

In the 5G communication system, the base station may indicate the slot format to the terminal based on L1 signaling. If the terminal may receive a higher layer parameter (eg, SlotFormatIndicator) for the slot format indication. In this case, the terminal may set a slot format indication-RNTI (SFI-RNTI). In addition, the terminal may receive a higher layer parameter (eg, dci-PayloadSize) for setting the payload size to set the payload size of DCI format 2_0. In addition, the UE may additionally receive PDCCH candidate, CCE aggregation level, and search space set information of CORESET for monitoring DCI format 2_0 from the base station.

Each slot format indication (SFI) index field in DCI format 2_0 may indicate to the UE the slot format to be applied to each slot in the slot set of DL BWP and UL BWP from the slot in which the corresponding DCI format 2_0 is detected. In this case, the size of the slot set may be equal to or greater than the PDCCH monitoring period of DCI format 2_0. As an example, the slot set may consist of N slots. In this case, DCI format 2_0 may include N SFI index fields. Each SFI index field may indicate the format values of Tables 18 and 19 below. In Tables 18 and 19, 'D' may indicate a downlink symbol, 'U' may indicate an uplink symbol, and 'F' may indicate a flexible symbol.

The 5G communication system can be flexible and support dense wireless backhaul links for each cell without wire network support through access backhaul aggregation (IAB).

13 is a conceptual diagram illustrating a first embodiment of an IAB network.

13, the IAB network is an IAB node 1300, upper nodes of the IAB node 1300 (parent / donor node) 1310, the child that is a lower node of the IAB node 1300 Nodes (child node) 1320 and terminal (user equipment, UE) 1330, NR Uu interface 1340 connecting IAB node 1300 and upper nodes 1310, IAB node 1300 and child It may include an NR Uu interface 1350 connecting the nodes 1320 and an NR Uu interface 1360 connecting the IAB node 1300 and the terminal 1330 . Here, the IAB node 1300 may be considered as a kind of relay/repeater configured based on a front-haul structure. The IAB node 1300 may be composed of two elements: IAB-DU and IAB-MT. In this case, the IAB node 1300 may communicate with the child node 1320 or the terminal 1330 using the IAB-DU. In this case, the child node 1320 or the terminal 1330 may recognize the corresponding IAB node 1300 as one cell (serving cell).

This is because the IAB-DU of the IAB node 1300 and the IAB-MT or the terminal 1330 of the child node 1320 are connected through the NR Uu interfaces 1350 and 1360, which is an air interface between the base station and the terminal. It could be because Similarly, the IAB node 1300 may perform communication with the upper node 1310 through the IAB-MT. The upper node 1310 may recognize the corresponding IAB node 1300 as one terminal. This may be because the IAB-MT of the IAB node 1300 and the IAB-DU of the upper node 1310 are connected through the NR Uu interface 1340 which is an air interface between the base station and the terminal.

The IAB node 1300 may have a structure in which the received signal is completely decoded and then re-encoded and amplified/transmitted. The IAB node 1300 may be classified as a type of regenerative relay. To this end, the IAB node 1300 has a structure including L1 and L2 layers on the protocol stack (it may include L3 or more in some cases), and from the upper node 1310 to the terminal 1330, a control plane (control plane, CP) and user plane (UP) may be supported.

14 is a block diagram illustrating a first embodiment of a separation structure of a central unit (CU) and a distributed unit (DU) in an IAB network.

Referring to FIG. 14 , a central unit (CU) and a distributed unit (DU) may be separated in an IAB network. In this separation structure, IAB nodes 1410 and 1415 of two-hop chain are connected to the IAB donor 1405 . Each of the IAB nodes 1410 and 1415 and the terminals 1420 , 1422 , and 1424 may be connected to the next generation core (NGC) 1400 in a stand-alone (SA) mode. The IAB nodes 1410 and 1415 may include one DU and one MT, respectively. Any IAB node (eg 1415 ) may be connected to a parent IAB node 1410 or an IAB donor 1405 via an MT 1417 . As another example, an IAB node (eg, 1410 ) may establish an RLC channel in the MT 1417 of the child IAB node 1415 through the DU 1414 . In this case, the RLC channels 1450 and 1452 generated for the MTs 1412 and 1417 may additionally include some information for IAB operation in addition to the components of the RLC channel for the UE. As such, the RLC channels 1450 and 1452 may be collectively referred to as modified RCL* (RCL*) because the contents thereof may be changed.

One IAB node may be connected to one or more parent IAB nodes or DUs of IAB donors. In this case, the IAB node may include a plurality of DUs. Each DU of the corresponding IAB node may have an F1-C (1440, 1442) connection with a single IAB donor CU-CP (control plane). This may mean that even if the IAB node has a plurality of user plane (UP) connections, there should be no confusion in the operation of the IAB node based on a single CP connection, that is, connected to a single IAB donor.

The IAB donor 1405 may include DUs to support the MT of the UE and child IAB nodes. The IAB donor 1405 may include a CU 1407 for itself and for the DUs 1409 , 1414 , 1419 of all child IAB nodes. It can be assumed that any IAB donor will have a single IAB donor. The IAB donor that manages the corresponding IAB donor may be changed by a topology adaptation function. A DU of an IAB node may be connected to a CU of an IAB donor through an F1 interface or a modified F1 interface (modified F1, F1*) 1440 and 1442 . F1*-U (user plane) may be operated on RLC channels 1450 and 1452 between the corresponding IAB-MTs 1417 and 1412 and the DUs 1414 and 1409 of the parent IAB node or donor.

Hereinafter, in the present disclosure, for convenience of description, upper layer parameters or higher layer settings may not be limited to the aforementioned L2 and L3 signaling. The upper layer parameter or upper layer setting may include all information transmitted or set through various interfaces such as the F1 interface 1440 and 1442, the NG interface 1430 (connecting the CU and NGC), and the X2 interface.

The above-described method of setting and indicating the slot format may be seen as limited to the case of the terminal. However, the above-described method for setting and indicating the slot format may not be limited thereto, and may be applied to the case of the IAB distribution unit (DU) and the mobile terminal (MT). For example, for each serving cell of the IAB-DU, the corresponding IAB-DU provides slot format information for each slot in a certain slot set and a higher layer parameter for IAB-DU resource configuration (eg, IAB-DU-Resource-Configuration). can be received and set. As another example, IAB-MT sets "slot format per slot" over one or more slots for each serving cell as a higher layer parameter for IAB-MT dedicated slot format configuration (eg tdd-UL-DL-ConfigurationDedicated-IAB- MT) can be received.

If the IAB-MT may receive a higher layer parameter (eg, tdd-UL-DL-ConfigurationDedicated-IAB-M) for configuring the IAB-MT dedicated slot format. In this case, the IAB-MT may replace the upper layer parameter (eg, tdd-UL-DL-ConfigurationDedicated) for configuring the dedicated slot format in the above-described method for configuring and indicating the slot format. Specifically, the upper layer parameter (eg, tdd-UL-DL-ConfigurationDedicated-IAB-MT) for configuring the IAB-MT dedicated slot format may include the following information.

□ IAB-MT Slot Configuration Set (slotSpecificConfigurationsToAddModList-IAB-MT): A set of slot configurations.

□ Slot index (slotIndex): an index of a slot included in the set of slot settings.

□ IAB-MT symbol directions (symbols-IAB-MT): The directions of the slot indicated by the slot index.

□ If the IAB-MT symbol directions are all downlinks (symbols-IAB-MT=allDownlink), all symbols in the corresponding slot are downlink symbols.

□ If all IAB-MT symbol directions are uplink (symbols-IAB-MT=allUplink), all symbols in the corresponding slot are uplink symbols.

□ If the IAB-MT symbol directions are explicit (symbols-IAB-MT = explicit), the number of downlink symbols (nrofDownlinkSymbols) can provide the number of downlink symbols located in the first part of the slot. . The number of uplink symbols (nrofUplinkSymbols) provides the number of downlink symbols located in the last part of the corresponding slot. The number of downlink symbols (nrofDownlinkSymbols) or the number of uplink symbols (nrofUplinkSymbols) may be omitted. In this case, the parameter can be regarded as indicating a value of 0. The remaining symbols in the slot become flexible symbols.

Like the general UE described above, the IAB-MT may also receive DCI format 2_0. Based on this, the IAB-MT may receive an indication of the slot format from the IAB-DU of the base station or the parent node. The IAB-MT may receive DCI format 2_0. In this case, the candidate values of each SFI field may not be limited to Tables 18 and 19. Candidate values of each SFI field may additionally include values of Tables 20 and 21.

The IAB-MT may receive information on symbols not to be used for a certain serving cell from an upper node through a higher layer parameter (eg, Provided Guard Symbols MAC CE). The IAB-MT may perform a transition (operation change, transition) between the IAB-MT and the IAB-DU of the corresponding IAB node during the time period of unused symbols. On the other hand, the base station may signal the numerology of the symbol to the terminal through a higher layer parameter (eg, Provided Guard Symbols MAC CE). In a cell of an IAB-DU, a symbol in a slot may be set to one of three types: “hard”, “soft”, and “unavailable (or not available)”. If a certain downlink, uplink, or flexible symbol is set to a hard type, the corresponding IAB-DU cell performs the operation of 'transmit', 'receive', or 'either transmission or reception' of a signal in the symbol, respectively. It may be possible. This may mean that the fact that a certain symbol is configured as a hard type guarantees that the downlink, uplink, or flexible symbol configuration of the IAB-DU for the corresponding symbol is reflected.

Specifically, 3GPP may provide F1 application protocol (F1AP) signaling as shown in Table 22. The upper IAB node (eg, IAB donor, parent node, core network, etc.) may set the DU resource type of the lower IAB node (eg, IAB node, child node) through this. Referring to Table 22, DU resource type information may include one HSNA slot configuration list. One HSNA slot configuration list may consist of one or more HSNA slot configurations. In this case, one HSNA slot configuration list may include HSNA slot configurations of the maximum number of HSNAs (eg maxnoofHSNA). The n-th HSNA slot configuration included in the HSNA slot configuration list is hard and soft for each of a downlink symbol, an uplink symbol, and a flexible symbol of the n-th slot according to the application period and start time of the HSNA slot configuration list. ), and information on whether the not-available type is applied.

If any downlink, uplink, or flexible symbol is set to a soft type, the corresponding IAB-DU cell 'transmit', 'receive', Alternatively, an operation of 'either transmission or reception' may be performed.

- Condition 1: When the IAB-MT (co-located/associated with the corresponding IAB-DU) does not perform transmission or reception in the corresponding symbol.

- Condition 2: IAB-MT (co-located/associated with the corresponding IAB-DU) can perform transmission or reception in the corresponding symbol, but the transmission/reception operation of the IAB-MT is IAB-DU It is a case that does not change due to the use of the corresponding symbol of

- Condition 3: When the IAB-MT (co-located/associated with the corresponding IAB-DU) receives DCI format 2_5 indicating the corresponding soft symbol as "available".

If a certain downlink, uplink, or flexible symbol is set to an unavailable (notavailable) type, the corresponding IAB-DU (cell) may not perform transmission or reception in the symbol. If the IAB-DU is included in the following list cell-specific (cell-specific), periodic (periodic) signal, semi-static (semi-static) signal or one of the channel can be transmitted in the symbol(s) of a certain slot . In this case, the IAB-DU may perform transmission/reception operation by assuming that the corresponding symbol(s) in the corresponding slot is a hard type regardless of the configured resource type:

- SS/PBCH block, type 0-PDCCH CSS sets configured by SIB1 (System Information Block 1) for PDCCH setting (PDCCH for Type0-PDCCH CSS sets configured by pdcchConfigSIB1), periodic CSI-RS, etc.

If the IAB-DU receives one of the cell-specific, periodic, semi-static, or channel included in the following list, the reception operation is performed on the symbol(s) of a certain slot. can be done In this case, the IAB-DU may perform transmission/reception operation by assuming that the corresponding symbol(s) in the corresponding slot is a hard type regardless of the configured resource type.

□ PRACH, SR (scheduling request)

□ The IAB-DU can receive the following information for each cell in the cell set of the IAB-DU

□ IAB-DU cell identifier (iabDuCellId-AI): means the identifier of the IAB-DU cell.

□ AI position in DCI format (positionInDCI-AI): The location of the availability identifier (AI) index field in DCI format 2_5.

□ Availability Combinations: Contains a list of the following two pieces of information for availability Combinations.

- Resource Availability (resourceAvailability): indicates resource availability for soft symbols included in one or more slots of the IAB-DU cell. The availability of soft symbols in one slot can be determined by referring to the values in Table 23.

- Availability combination identifier (availabilityCombinationId): Represents a mapping between resource availability (resourceAvailability) and the availability indicator (AI) index field in DCI format 2_5.

개의 비트들을 포함할 수 있다. DCI 포맷 2_5의 가용성 지시자 인덱스 필드는 표 23의 값들 중 하나와 매핑될 수 있다. 이때 AI 인덱스 최대값(maxAIindex)은 제공된 가용성 결합 식별자(availabilityCombinationId)값들 중 최대값을 의미할 수 있다. 표 23은 한 슬롯 내에서 자원 가용성(resourceAvailability)값과 소프트 심볼의 유형간 매핑 관계를 나타낼 수 있다.As described above, in DCI format 2_5, one availability indicator index field may indicate to the IAB-DU the availability of soft symbols included in each slot in a certain slot set. The IAB-MT may start from the earliest slot among the slots of the IAB-DU overlapping the slot in which the corresponding DCI format 2_5 is detected in the time domain. In addition, the size of the slot set may be greater than or equal to the PDCCH monitoring period of DCI format 2_5 given from an upper layer parameter for the search space (eg, SearchSpace). The availability indicator index field of DCI format 2_5 is

may include bits. The availability indicator index field of DCI format 2_5 may be mapped to one of the values of Table 23. In this case, the maximum AI index value (maxAIindex) may mean the maximum value among the provided availability combination identifier (availabilityCombinationId) values. Table 23 may indicate a mapping relationship between a resource availability value and a soft symbol type within one slot.

As described above, the upper IAB node including the IAB donor may indicate whether to use the soft symbol of the lower IAB node based on DCI format 2_5 and the contents of Table 23. On the other hand, the IAB node may be designed to operate in half duplex, that is, the MT and DU of an IAB node are time division duplexed (TDM). The 3GPP TS38.473 standard may provide F1 application protocol (F1AP) signaling as shown in Table 24. Through this, the IAB node provides the upper IAB node (eg, IAB donor, parent node) with the IAB-DU of the IAB node (or the cell of the gNB-DU) and the IAB-MT (or collocated) IAB of the IAB node. It is possible to report or deliver inter-cell multiplexing capability (cell configured to -MT). Referring to Table 24, the multiplexing information may include one IAB-MT cell list composed of one or more IAB-MT cell information. In this case, one IAB-MT cell list may include IAB-MT cell information of the maximum number of serving cells (maxnoofServingCells). The n-th IAB-MT cell information included in the IAB-MT cell list may include ID (NR Cell Identity) information of the corresponding cell and information on whether the following four types of multiplexing are supported.

- DU_RX/MT_RX multiplexing: informs whether the corresponding IAB node supports simultaneous reception in DU and MT

- DU_TX/MT_TX multiplexing: informs whether the corresponding IAB node supports simultaneous transmission in DU and MT

- DU_TX/MT_RX multiplexing: informs whether the corresponding IAB node can simultaneously perform transmission in DU and reception in MT

- DU_RX/MT_TX multiplexing: informs whether the corresponding IAB node can simultaneously perform reception in DU and transmission in MT

According to Table 24, the IAB node may semi-statically report whether DU/MT multiplexing capability or DU/MT simultaneous operation is applicable for each cell. Whether to apply DU/MT simultaneous operation to the corresponding IAB node may depend entirely on the corresponding IAB node. The upper IAB node may not support controlling the DU/MT simultaneous operation of the lower IAB node dynamically or semi-statically according to circumstances.

15 is a flowchart illustrating a first embodiment of a procedure for determining whether an IAB-DU resource is used by an IAB node.

Referring to FIG. 15 , in the order of determining whether to use the IAB-DU resource of the IAB node, the IAB node may check whether the corresponding IAB-DU resource is available. The IAB node may receive at least one of upper layer IAB-MT resource configuration information and IAB-DU resource configuration information from the upper IAB node in order to determine whether to use it (S1500). As an example, the higher layer IAB-MT resource configuration information may include a D/U/F (downlink/uplink/flexible) slot and symbol configuration information for a cell (or a set of cells) of the IAB-MT. As another example, the higher layer IAB-DU resource configuration information may include a D/U/F (downlink/uplink/flexible) slot and symbol configuration for a cell (or a set of cells) of the IAB-DU. .

The higher layer IAB-DU resource configuration information may include type (hard, soft, not-available) information of the IAB-DU resource configured by the upper IAB node. The upper layer IAB-DU resource configuration information includes the SSB configured in the cell (or set of cells) in which the IAB-DU is configured, the type 0-PDCCH CSS set configured by SIB1 for PDCCH configuration, CSI-RS, etc. It may include some or all of a specific)/semi-static downlink signal and channel. The upper layer IAB-DU resource configuration information includes cell-specific/semi-static uplink signals and channels such as PRACH and SR configured in the cell (or set of cells) to which the IAB-DU is configured. It may include some or all.

In addition to the above-described upper layer configuration, the IAB node may receive at least one of a physical layer (L1 signaling) IAB-MT resource indicator and an IAB-DU resource indicator from the upper IAB node (S1510). As an example, the physical layer IAB-MT resource indicator may be DCI format 2_0 including a slot format indicator for a cell (or a set of cells) configured by IAB-MT. As another example, the physical layer IAB-DU resource indicator may be a DCI format 2_5 including an IAB-DU soft resource availability indicator (availability identifier, AI).

Finally, the IAB node may finally determine whether to use the IAB-DU resource based on the higher layer signal (S1500) and the L1 signaling (S1510) information (S1520).

In general, it is not possible to force all terminals to implement the same feature. Through a UE capability report, an expensive terminal can implement a large amount of functions with high performance. And, through the terminal capability report, a low-cost terminal can implement a small amount of functions with low performance. The terminal capability report may make it possible to secure the degree of freedom in terminal implementation for various situations as described above. In addition, by reporting the corresponding information to the network, the base station can set each function within the limit supported by each terminal. All terminals may promise to implement certain functions compulsorily. In this case, the terminal capability report for the corresponding function may be omitted.

The UE may perform UE capability reporting of different values for one function for each frequency band or for each duplex scheme. For example, the terminal may support a specific function for frequency range 1 (FR1), which means a band below 6 GHz, but the corresponding function for frequency range 2 (FR2), which means a band above 6 GHz. It can report to the base station that does not support . As another example, the UE may support a specific function in TDD, but may report that the UE does not support the corresponding function in FDD to the base station.

When the terminal performs the terminal capability report, the base station may proceed with respect to the content of the terminal capability report when configuring, instructing, or scheduling the terminal. The base station may instruct the terminal to configure, instruct, or schedule contrary to the terminal capability report. In this case, the UE may ignore it.

16 is a flowchart illustrating a first embodiment of a terminal capability reporting procedure.

Referring to FIG. 16 , in the terminal capability reporting procedure, the base station may transmit a terminal capability report request signal to the terminal when the terminal is in RRC connected mode (UE in RRC_CONNECTED) (S1600). In this case, the base station may transmit the terminal capability report request signal to the terminal through a higher layer parameter (eg, UECapabilityEnquiry) for the terminal capability report request. In addition, the network may refer to only the terminal capability report after AS (access stratum) security activation. The network may not retransmit or report the terminal capability report before the AS security activation to the CN (core network). The terminal may receive the terminal capability report request signaling. The terminal may compile the terminal capability information according to a specific procedure. The terminal may transmit the terminal capability information to the base station through the terminal capability information (eg, UECapabilityInformmation) signal (S1610).

A specific procedure for generating the terminal capability information signal includes a band supported by the terminal, a band combination (BC) list (supportedBandCombinationList), and feature set information related to feature sets supported by the terminal (feature set). sets, FS) or a generation procedure for feature sets combinations (FSC) related to combinations of feature sets supported by the terminal. For example, when the base station requests a terminal capability report from the terminal to obtain information on a band or band combination supported by the terminal, it may request to report to the terminal which bands are supported for each radio access technology (RAT). To this end, the base station receives the RAT-Type of the terminal RAT capability report request signal (eg UE-CapabilityRAT-Request) included in the UE RAT capability report request list signal (eg ue-CapabilityRAT-RequestList) which is a higher layer message. Can be set to 'nr', 'eutra-nr', 'eutra' or 'eutra-fdd'. This may mean that the base station may request a terminal capability report for one or more RAT or RAT combinations from the terminal. In this case, the UE may perform a response for each request to the list of support bands for a plurality of RATs or RAT combinations. As an example, the RAT-type may be set to 'nr'. In this case, the UE may include a list of bands or band combinations to which NR-DC can be applied in the UE capability report. As another example, the RAT-type may be set to 'eutra-nr'. In this case, the UE may include a list of bands or band combinations applicable to multi-RAT DC (MR-DC) such as EN-DC, NGEN-DC, NE-DC, etc. in the UE capability report. In addition, when the base station requests a terminal capability report from the terminal, a list of bands for determining whether support is provided may be provided to the terminal through a higher layer parameter for a band list filter (eg, frequencyBandListFilter). For the bands included in the upper layer parameter for the band list filter (eg, frequencyBandListFilter), the UE considers 'RAT types supported by each predefined band', 'RAT-type information requested by the base station', etc. (candidate band combination) can be determined. And, the terminal may include it in the terminal capability report.

In the 5G communication system, the base station may provide information related to transmission power between each downlink channel and signal for the purpose of improving channel or signal reception and quality measurement accuracy of the terminal and reducing implementation complexity. The information about the transmit power may explicitly inform the transmit power value of a certain signal or channel. Alternatively, the information on the transmit power may include implicit signaling methods for informing a ratio between the transmit powers of two different channels and signals.

17 is a graph illustrating transmission power of an NR downlink channel/signal.

Referring to FIG. 17 , a graph showing the transmission power of the NR downlink channel/signal shows the transmission power 1700 of the SSB, the transmission power 1705 of the PDCCH, the transmission power 1710 of the CSI-RS, and the transmission power of the PDSCH ( 1715) can be shown. In addition, the graph showing the transmission power of the NR downlink channel / signal is the PDSCH relative transmission power (P _c ) 1720, which is the difference between the PDSCH EPRE for the CSI-RS energy per resource element (EPRE), and the CSI-RS EPRE. SSB relative transmit power (P _c,SS ) 1725 , which is the difference between SSB EPRE, and PDCCH relative transmit power (P _c,PDCCH ) 1730 , which is the difference between PDCCH EPRE with respect to CSI-RS EPRE, may be shown. Although the graph showing the transmission power of the NR downlink channel/signal shows only one of each downlink channel/signal for each type, this is for convenience of explanation, and in actual application, a plurality of channels/signals having different powers may exist. have.

The base station may set the transmission power 1700 of the SSB to the terminal through a higher layer parameter (eg, ss-PBCH-BlockPower) for SSB block transmission included in the serving cell common configuration signal (eg, ServingCellConfigCommon). As another method, the base station may inversely calculate the SSB transmit power 1700 based on the received power of the SSB obtained through RSRP measurement and a pre-measured pathloss value. In 5G, the base station can set the difference in transmission power between downlink channels/signals to the terminal through the following three parameters.

- PDSCH relative transmit power parameter P _c (1720): PDSCH relative transmit power parameter P _c means the difference of PDSCH EPRE to CSI-RS EPRE (PDSCH EPRE versus NZP CSI-RS EPRE when the UE induces CSI feedback) is the assumed difference of ). The PDSCH relative transmit power parameter P _c may be set for each CSI-RS resource configuration through an upper layer parameter for power control offset (eg, powerControlOffset), and values between -8 and 15 dB are indicated at 1 dB intervals. can. For example, the P _c value set for a certain CSI-RS resource may be 0 dB. In this case, the EPRE of the RE in which the corresponding CSI-RS is transmitted and the EPRE of the RE in which the PDSCH is transmitted are the same. As another example, the P _c value set for a certain CSI-RS resource may be -3 dB. In this case, the EPRE of the RE in which the CSI-RS is transmitted is twice (3 dB) larger than the EPRE of the RE in which the PDSCH is transmitted.

- SSB relative transmit power parameter P _c,SS (1725): SSB relative transmit power parameter P _c,SS means the difference of CSI-RS EPRE to SS/PBCH block (SSB) EPRE (SS/PBCH block EPRE vs. is the assumed difference of the NZP CSI-RS EPRE). The SSB relative transmit power parameters P _c,SS may be set for each CSI-RS resource configuration through a higher layer parameter for SSB power control offset (eg, powerControlOffsetSS). For example, the P _c value set for a certain CSI-RS resource may be 0 dB. In this case, the EPRE of the RE through which the CSI-RS is transmitted and the EPRE of the RE through which the SSB is transmitted are the same. As another example, the P _c value set for a certain CSI-RS resource may be -3 dB. In this case, the EPRE of the RE in which the CSI-RS is transmitted is twice (3 dB) smaller than the EPRE of the RE in which the SSB is transmitted.

- PDCCH relative transmit power parameter P _c,PDCCH (1730): PDCCH relative transmit power parameter P _c,PDCCH means the difference between CSI-RS EPRE and PDCCH EPRE (the hypothesized difference between NZP CSI-RS EPRE and PDCCH EPRE or is the assumed difference of PDCCH EPRE vs. NZP CSI-RS EPRE). The UE may be promised to assume that the value of P _{c and PDCCH} is 0 dB without special signaling. That is, the UE may assume that the PDCCH EPRE and the CSI-RS EPRE are the same value.

Through the method in Table 24, the IAB node may report information on the simultaneous transmission/reception capability of IAB-DU and IAB-MT to upper nodes (parent node, IAB-CU, IAB donor, etc.). However, it can be seen that the IAB node is targeting a DU/MT half-duplex IAB node that does not have simultaneous transmission/reception capability for all standard support other than D/U/F resource configuration. This may cause the following problems when the IAB node performs simultaneous DU/MT transmission/reception.

The first problem is that a specific DU/MT simultaneous transmission/reception pattern may be determined as an error in the conventional standard. For example, for data transmission/reception between the IAB-DU and the UE, the link direction between the IAB-DU of the IAB node and the slot configured in the UE may be downlink (hereinafter may be referred to as a DL access slot). ). In this case, it may be natural for the IAB-DU to transmit data to the UE. However, when the IAB-MT performs transmission, it may be determined as an error according to the standard.

As another example, for data transmission/reception between the IAB-DU and the terminal, the IAB-DU of the IAB node and the slot configured in the terminal may be uplink (hereinafter may be referred to as an uplink access slot). ). In this case, it may be natural for the UE to transmit the IAB-DU. And, since the IAB-MT may be affected by such a transmission direction, it may be natural to perform transmission to a higher node. However, when an uplink access slot is configured in the IAB node, it may be determined as an error in the standard that the IAB-DU, which is treated as a base station, transmits data to the terminal in the corresponding slot. The second problem is that when the IAB node performs a simultaneous transmit-receive operation, self-interference that suffers a path loss of a small magnitude compared to the access link may degrade the communication capacity of the IAB backhaul link. For example, when the IAB-DU uses a transmit power of about 43 dBm, assuming a shielding between the DUs/MTs of about 7 to 80 dB, interference of about -40 dBm or more may remain. Such interference may have a non-negligible effect on the reception performance of the IAB-MT.

Meanwhile, in the IAB node, at least one of DU/MT performs transmission in DU/MT multiplexing modes (ie, DU_RX/MT_RX, DU_TX/MT_TX, DU_TX/MT_RX, DU_RX/MT_TX) for four DU/MT simultaneous operations. can do. In this case, the IAB node may be associated with the downlink access slot or the uplink access slot according to at least one of the following four cases.

- Case #1: It may be a case in which the IAB-MT transmits an uplink signal or channel in one or more uplink access slots. Such a case may coincide with the base station/terminal operation defined by the standard.

- Case #2: It may be a case in which the IAB-MT transmits an uplink signal or channel in one or more downlink access slots. Such a case can be divided into the following two sub-cases according to a method in which the upper node of the IAB node sets the slot transmission direction to the UE and the IAB-MT.

Subcase #2-1: The upper node of the IAB node may set or indicate the slot transmission direction to U (uplink) for IAB-MT for a given time interval, that is, one or more OFDM symbols or slots . And, it may be a case in which the upper node of the IAB node sets or instructs the terminal to be D (downlink). As an example, the upper node of the IAB node has a dedicated slot format setting parameter or IAB-MT dedicated for IAB-MT when the slot transmission direction set by the higher layer parameter for common slot format setting for a given time interval is flexible. The slot transmission direction may be reset to uplink by using one of the parameters for setting the slot format. In addition, the upper node of the IAB node transmits the time period in which the slot transmission direction set by the upper layer parameter for common slot format setting is flexible for a given time period to the downlink using the dedicated slot format setting parameter for the terminal. can be reset. On the other hand, such a setting or instruction may have a disadvantage in violating the group special mobile association (GSMA) recommendation, which recommends matching the TDD D/U directions between the same network or different networks within one time point. This may cause problems for geographically adjacent networks in the same frequency band that follow GSMA recommendations or other networks in the same geographic area using adjacent frequencies.

Subcase #2-2: It may be a case in which the upper node resets the slot transmission direction to downlink for the UE and the IAB-MT when the slot transmission direction set in the IAB node for a given time interval is flexible. In this sub-case, since the IAB-MT does not determine the corresponding slot as a valid uplink slot or a valid UL slot/symbol, the uplink transmission operation may not be performed.

- Case #3: It may be a case in which the IAB-DU transmits a downlink signal or channel in one or more uplink access slots. In this case, the slot transmission direction for IAB-MT in a given time interval, that is, one or more OFDM symbols or slots, may be configured or indicated as uplink. On the other hand, the IAB-DU may be a case in which the slot transmission direction of the serving cell supported by the DU is configured or indicated as downlink. In this way, the IAB-DU may set or indicate the transmission direction of the serving cell to the downlink. In this case, the IAB-DU may perform an operation permitted by the standard only if it does not affect the operation of the IAB-MT. However, the serving cell supported by the IAB-DU may be configured or indicated as downlink. In this case, the operation may not conform to the above-mentioned GSMA recommendation. In addition, when a serving cell supported by the IAB-DU is configured or indicated as a downlink, it may interfere with a geographically adjacent network of the same frequency band or other networks in the same geographic area using an adjacent frequency. Accordingly, when the IAB-DU configures or instructs the serving cell to be supported by the downlink, a method for reducing interference to a geographically adjacent network of the same frequency band or other networks in the same geographic area using an adjacent frequency may be required.

- Case #4: It may be a case in which the IAB node DU transmits a downlink signal or channel in the downlink access slot of the IAB node MT. Such a case may coincide with the base station/terminal operation defined by the standard.

Cases #1 to #4 described above may not be mutually exclusive, and may be appropriately combined as needed. As an example, when the IAB node wants to minimize the specification/implementation change for DU transmission in the DU_TX/MT_TX multiplex environment, it may be possible to simultaneously apply Case #2 and Case #4 based on the downlink access slot. As another example, when the IAB node wants to minimize the specification/implementation change for MT transmission in the DU_TX/MT_TX multiplex environment, it may be possible to simultaneously apply Case #1 and Case #3 based on the uplink access slot.

On the other hand, case #2 (including subcase #2-1 and subcase #2-2) and case #3 may cause magnetic interference. In order to solve this, at least one of the following solutions may be applied. .

Method 1-1: Considering the case where the symbol or slot of the IAB-MT is set/indicated as U as in sub-case #2-1 or case #3, the IAB parent node is the IAB-MT of the IAB node, the IAB node's A guard interval applicable to an uplink slot of a child node or a terminal may be set. Such a guard period may be defined in a form in which transmission of an uplink channel or signal is restricted in units of symbols or slots, such as a guard symbol. Alternatively, the guard interval may be defined depending on at least one of a CSI-RS, a control resource set (CORESET), a search space (SS), and a combination of CORESET and SS. Alternatively, the guard period may be achieved by limiting to a combination of one or more of an uplink signal such as SRS, PUCCH, PRACH, or an RE pattern of a channel.

In addition, the guard interval can be achieved by allowing it to be recognized as a RE-level rate matching resource for PUSCH transmission. That is, the IAB-MT may perform RE mapping and transmission by excluding a corresponding resource during PUSCH transmission. Specifically, in subcase #2-1, when the IAB-MT transmits the uplink signal, it protects the downlink signal of the terminal to ensure the reception performance of the terminal. Similarly, in case #3, the guard interval allows the IAB-DU to adjust the uplink resource mapping of the IAB-MT in consideration of downlink signal transmission, thereby improving the IAB-DU signal reception performance of the UE and the IAB-MT signal of the upper node. The reception performance can be improved at the same time. As such, the guard period may be applied to the uplink in a manner similar to the method of rate matching the CSI-RS RE pattern during PDSCH RE mapping.

Method 1-2: The upper node may set/indicate a symbol or slot of IAB-MT to D as in subcase #2-2. In this case, signaling allowing the IAB-MT to perform uplink transmission may be performed. The upper node may perform signaling that allows the IAB-MT to perform uplink transmission in a downlink symbol or slot based on at least one layer of L1, L2, and L3. Method 1-2 may be understood as notifying the corresponding IAB node that the upper node of the IAB node that has received the transmission request from the IAB node has the ability to perform simultaneous transmission and reception.

As an example, one of the rows of Table 24 may be delivered to a lower node through independent signaling. In this case, simultaneous DU/MT transmission/reception due to the corresponding signaling may be limited to be performed only within a specific time/frequency resource including the corresponding signaling or limited through another independent signaling. This may be so that the upper node can adjust implementation complexity and power/computational resource consumption according to the situation.

Method 1-3: Considering simultaneous transmission and reception including transmission of IAB-DU as in Case #3, it may be a method in which the upper node restricts simultaneous transmission and reception only in the case where the IAB-DU applies downlink power control. have. Such limited permission is implicitly determined depending on whether downlink power control is applied (that is, simultaneous transmission and reception can be allowed in a case to which downlink power control is applied, and simultaneous transmission and reception in a case to which downlink power control is not applied) not allowed) can be promised. Alternatively, limited permission may be explicitly indicated to the IAB node by the upper node through an independent higher layer parameter or L1 signaling.

18A is a flowchart illustrating a first embodiment of a method for transmitting and receiving an access backhaul aggregation node in a communication system.

Referring to FIG. 18A , in the method of transmitting and receiving an access backhaul integrated node, the IAB node may receive power control information on the transmission power of a downlink channel or signal from an upper node through L1 signaling or through an upper layer parameter ( S1801a). Accordingly, the IAB node may assume or derive the transmission power of the downlink signal transmitted from the upper node according to the received power control information. Then, the IAB node may receive downlink configuration information for a specific time interval from the upper node (S1802a). Accordingly, the IAB node may set the transmission direction to the downlink for a specific time interval (S1803a). Here, the IAB node separately receives the power control information and the downlink configuration information from the upper node, but may receive the power control information by including the power control information in the downlink configuration information. Thereafter, the IAB node may receive power adjustment information on the transmission power of the downlink channel or signal from the upper node through L1 signaling or through higher layer parameters (S1804a).

Here, the power adjustment information may include at least one of SSB beam information, CSI-RS beam information, PDCCH beam information, and PDSCH beam information. Such beam information may be represented by at least one of one or more transmission configuration indicator (TCI) states, an SSB resource index, and a CSI-RS resource index. In addition, the information on a specific time interval may be information on a time resource represented by one of symbol index sets, slot index sets, subframe index sets, and frame index sets. In addition, information on a specific time period is information on time resources that are set or determined so that the IAB-MT and IAB-DU constituting the IAB node are multiplexed in either method of frequency division or space division to perform communication at the same time can be

Then, the IAB node may assume or derive the adjusted transmission power of the downlink signal transmitted from the upper node based on the power adjustment information received from the upper node (S1805a). Thereafter, a downlink signal transmitted from the upper node of the IAB node may be received using the adjusted transmission power (S1806a).

18B is a flowchart illustrating a second embodiment of a method for transmitting and receiving an access backhaul aggregation node in a communication system.

Referring to FIG. 18B , in the transmission/reception method of the access backhaul integrated node, the IAB node may receive power control information on the transmission power of a downlink channel or signal from an upper node through L1 signaling or through an upper layer parameter ( S1801b). Accordingly, the IAB node may set the transmission power of the downlink signal according to the received power control information. Then, the IAB node may receive downlink configuration information for a specific time interval from the upper node (S1802b). Then, the IAB node may instruct the terminal to set the transmission direction to the downlink for a specific time interval (S1803b). Thereafter, the IAB node may receive power adjustment information on the transmission power of the downlink channel or signal from the upper node through L1 signaling or through higher layer parameters (S1804b).

Then, the IAB node may adjust the transmission power of the downlink signal based on the power adjustment information received from the upper node (S1805b). Thereafter, the IAB-DU of the IAB node may transmit a downlink signal to the terminal using the adjusted transmission power (S1806b). Of course, the IAB node may receive the downlink configuration information of the IAB-MT for a specific time interval from the upper node. Accordingly, the IAB-MT of the IAB node may receive a downlink signal from the upper node in a specific time interval. Alternatively, the IAB node may receive the uplink configuration information of the IAB-MT for a specific time interval from the upper node. Accordingly, the IAB-MT of the IAB node may transmit an uplink signal from the upper node to the upper node in a specific time interval.

19 is a flowchart illustrating a first embodiment of a method for controlling power of an IAB node.

Referring to FIG. 19 , the communication system may include a first IAB node and a second IAB node. The second IAB node may be an upper node (eg, a parent node) of the first IAB node. The first IAB node may communicate with other communication nodes. For example, the first IAB node may perform a communication transmission/reception operation with other communication nodes. Other communication nodes may include “second IAB node and third IAB node” or “second IAB node and terminal”. The third IAB node may be a lower node (eg, a child node) of the first IAB node. In another example, the third IAB node may be another upper node (eg, a second parent node) of the first IAB node.

Downlink communication power information of the second IAB node may be transmitted to the first IAB node (S1901). The power information of the downlink communication may include energy per resource element (EPRE) information and/or a power control offset (powerControlOffsetIAB) of a CSI-RS transmitted by the second IAB. Downlink communication power information may be transmitted through an upper layer message of the second IAB node. The EPRE information and the power control offset of the CSI-RS may be included in the same higher layer message or different higher layer messages.

The first IAB node may receive downlink communication power information of the second IAB node (eg, EPRE and power control offset of CSI-RS) from the second IAB node. The first IAB node may derive the EPRE of the PDSCH transmitted by the second IAB node in consideration of the EPRE of the CSI-RS and the power control offset (S1902). For example, the first IAB node may derive the EPRE of the PDSCH transmitted by the second IAB node by applying the power control offset to the EPRE of the CSI-RS. The first IAB node may transmit a first message requesting adjustment of the transmission power of the PDSCH transmitted by the second IAB node to the second IAB node (S1903). Step S1903 may be performed when it is necessary to adjust the transmission power of the PDSCH transmitted by the second IAB node for the purpose of performing the DU/MT simultaneous operation of the first IAB node. The first message transmitted in step S1903 may be MAC CE. MAC CE is an "indicator requesting adjustment of transmit power" and/or "conventional transmission of a transmit power adjustment value (eg, 3dB, 1dB, -1dB, -3dB, etc.) requested by the first IAB node. relative change in power)”. In addition, the MAC CE may further include a type indicator indicating that the corresponding MAC CE is a MAC CE requesting adjustment of the transmit power of the second IAB node. The first message may be transmitted via PUSCH (eg, payload of MsgA) and/or PUCCH. For example, when the first message is transmitted through the payload of MsgA, the procedure for adjusting the transmit power (eg, EPRE) of the PDSCH of the second IAB node is to be performed through a two-step random access (RA) procedure. can

The second IAB node may receive a first message requesting adjustment of transmit power from the first IAB node. The second IAB node may confirm that adjustment of the transmission power of the PDSCH transmitted by the second IAB node is requested based on the information element(s) included in the first message. The second IAB node may transmit a second message including information on the adjusted transmit power to the first IAB node (S1904). The second message may be transmitted through the PDSCH. The second message may be a MAC CE and may be transmitted in response to the first message. In addition, the second message may further include information indicating that the request of the transmission control requested by the first IAB node is accepted (accepted). In addition, the MAC CE may further include a type indicator indicating that the corresponding MAC CE is a MAC CE including information on the adjusted transmission power of the second IAB node. The information on the adjusted transmit power included in the second message may be an adjustment value of the transmit power included in the first message. Alternatively, the second IAB node may adjust the transmit power of the PDSCH in consideration of the adjustment value of the transmit power included in the first message, and transmit a second message including information on the adjusted transmit power to the first IAB node. can be transmitted In this case, the second IAB node may transmit the PDSCH based on the information on the adjusted transmit power included in the second message.

In addition, the second message may include time resource information and/or frequency resource information to which the information of the adjusted transmission power is applied. The time resource information may be configured in units of symbols, mini-slots, or slots. The frequency resource information may indicate a frequency band in which the first IAB node operates. Alternatively, time resource information and/or frequency resource information to which the adjusted transmission power information is applied may be preset by higher layer signaling of the second IAB node instead of the second message.

On the other hand, before step S1904, the second IAB node may transmit control information (eg, DCI) including the transmission resource information of the second message to the first IAB node. Control information may be scrambled by a specific RNTI (eg, power adjustment (PA)-RNTI, MsgB-RNTI). In this case, the first IAB node may perform a monitoring operation for reception of control information using a specific RNTI before reception of the second message. When the control information is received, the first IAB node may receive the second message from the resource indicated by the control information.

The first IAB node may receive the second message from the second IAB node, and may check information on the adjusted transmit power of the PDSCH included in the second message. The first IAB node may derive the adjusted EPRE of the PDSCH by applying the adjusted transmit power information to the EPRE of the PDSCH derived in step S1902 (S1905). In this case, the first IAB node may determine that the PDSCH transmitted by the second IAB node has the adjusted EPRE.

The second IAB node may inform the first IAB node of information on the beam(s) to which the second message (eg, information of the adjusted transmission power) is applied. The information of the beam(s) may be indicated by the second message, control information for scheduling the second message, and/or higher layer signaling. The information of the beam(s) may be a TCI state and/or an RS resource index. When the information of the beam(s) is indicated to the first IAB node, the first IAB node may apply the adjusted transmit power information to the beam(s) indicated by the second IAB node. When information on the beam(s) to which the second message (eg, information of the adjusted transmit power) is applied is not received from the second IAB node, the first IAB node transmits the information of the adjusted transmit power to all beams. can be considered applicable. Alternatively, when information on the beam(s) to which the second message (eg, information of adjusted transmit power) is applied is not received from the second IAB node, the information of the adjusted transmit power is applied to the first IAB node. can be judged not to be.

The first IAB node may perform communication in consideration of the adjusted EPRE of the PDSCH derived in step S1905 (S1906). In step S1906, the first IAB node may perform simultaneous transmission/reception operation with other communication nodes (eg, the second IAB node and the third IAB node). In this case, the first IAB node considers the adjusted EPRE of the PDSCH transmitted from the second IAB node "transmission power determination operation of the channel and/or signal transmitted to the third IAB node or terminal" and/or "simultaneous transmission and reception" operation of controlling or removing interference caused by the operation".

20 is a graph showing a first embodiment of power control information and power adjustment information.

Referring to FIG. 20, the power control information received by the IAB node from the upper node is the transmission power of the SSB (2000), the PDSCH relative transmission power (P _c ) (2020), which is the difference between the PDSCH EPRE with respect to the CSI-RS EPRE, CSI -SSB relative transmit power (P _c,SS ) ( 2025 ), which is the difference of SSB EPRE for RS EPRE, and PDCCH relative transmit power (P _c,PDCCH ) ( 2030 ), which is the difference between PDCCH EPRE for CSI-RS EPRE have. In this case, the IAB node may receive the SSB transmission power 2000 information from the upper node through the upper layer parameter for SSB block transmission included in the serving cell common configuration signal. And, the IAB node through the upper layer parameter for the power control offset, the PDSCH relative transmit power (P _c ) (2020) information, which is the difference between the PDSCH EPRE for the CSI-RS EPRE, and the SSB that is the difference between the SSB EPRE for the CSI-RS EPRE. The relative transmit power (P _c,SS ) 2025 information and PDCCH relative transmit power (P _c,PDCCH ) 2030 information that is the difference between the PDCCH EPRE with respect to the CSI-RS EPRE may be received. In this case, the IAB node transmits the SSB transmit power (2000) information, the PDSCH relative transmit power (P _c ) (2020) information that is the difference between the PDSCH EPRE for the CSI-RS EPRE, and the SSB that is the difference between the SSB EPRE for the CSI-RS EPRE. Relative transmit power (P _c,SS ) (2025) information and the PDCCH relative transmit power (P c,PDCCH ), which is the difference between the PDCCH EPRE for the CSI-RS EPRE, using the PDCCH relative transmit power (P _c,PDCCH ) 2030 information to transmit power of the PDCCH (2005), Transmission power 2010 of CSI-RS and transmission power 2015 of PDSCH may be calculated. Of course, the PDCCH relative transmit power (P _c,PDCCH ), which is the difference between the PDCCH EPRE and the CSI-RS EPRE, may follow a predetermined value (eg, 0 dB).

Meanwhile, referring to FIG. 20 , the power adjustment information may include power offset (P _c,offset ) 2035 information. Here, the power offset 2035 information may be common to the transmission power 2000 of the SSB, the transmission power 2005 of the PDCCH, and the transmission power 2010 of the PDSCH.

In this way, the IAB node may receive power adjustment information to be used for transmitting the downlink signal from the upper node. In addition, the IAB node may adjust the transmission power of the downlink signal according to the received power adjustment information. In this case, the IAB node may adjust the transmit power to reduce the transmit power of each downlink channel/signal according to the power offset 2035 information during simultaneous DU/MT transmission/reception. Alternatively, the IAB node may adjust the transmit power to increase the transmit power of each downlink channel/signal according to the power offset 2035 information during simultaneous DU/MT transmission/reception. In this case, the IAB node may receive the power offset 2035 information by L1 signaling. Alternatively, the IAB node may receive the power offset 2035 information through a higher layer parameter. Alternatively, the IAB node may receive the power offset 2035 information through a combination of L1 signaling and higher layer parameters.

As such, the IAB node receives the power offset 2035 information common to the transmission power 2000 of the SSB, the transmission power 2005 of the PDCCH, and the transmission power 2005 of the PDSCH from the upper node to adjust the transmission power. The signaling structure may be simple. In addition, the signaling burden may be small, and there may be an advantage that the ratio of transmission power between each channel/signal does not change with time. In this case, when the power offset is actually applied to the transmission power of the SSB (2000), the transmission power of the PDCCH (2005), and the transmission power of the PDSCH (2010), the P _{c and PDCCH} values may be maintained at 0 dB. As a result, the IAB node and the upper node can minimize the influence on methods of operation based on the power ratio between the CSI-RS and the PDCCH, such as beam failure detection (BFD).

21 is a graph showing a second embodiment of power control information and power adjustment information.

Referring to FIG. 21 , the power control configuration information received by the IAB node from the upper node is the transmit power (2100-1 to 2100) of the SSB for each beam in a case where the IAB node uses N beams (beam 1 to beam N). -N) information, PDSCH relative transmit power (P _c ) (2120-1 to 2120-N) information, which is the difference between PDSCH EPRE for CSI-RS EPRE, SSB relative transmit power that is the difference between SSB EPRE for CSI-RS EPRE (P _c,SS ) (2125-1 to 2125-N) information and PDCCH relative transmit power (P _c,PDCCH ) (2130-1 to 2130-N) information, which is the difference between PDCCH EPRE for CSI-RS EPRE have.

In this case, the IAB node may receive the SSB transmission power (2100-1 to 2100-N) information for each beam from the upper node through the upper layer parameter for SSB block transmission included in the serving cell common configuration signal. In addition, the IAB node transmits the PDSCH relative transmit power (P _c ) (2120-1 to 2120-N) information, which is the difference between the PDSCH EPRE for the CSI-RS EPRE for each beam, through the upper layer parameter for the power control offset, CSI-RS SSB relative transmit power (P _c,SS ) (2125-1 to 2125-N) information that is the difference between SSB EPRE for EPRE and PDCCH relative transmit power (P _c,PDCCH ) that is the difference between PDCCH EPRE for CSI-RS EPRE (2130-1 to 2130-N) information may be received. In this case, the IAB node transmit power (2100-1 to 2100-N) information of the SSB for each beam, the PDSCH relative transmit power (P _c ) (2120-1 to 2120-N), which is the difference between the PDSCH EPRE and the CSI-RS EPRE. ) information, SSB relative transmit power (P _c,SS ) (2125-1 to 2125-N) information, which is the difference of SSB EPRE for CSI-RS EPRE, and PDCCH relative transmit power, which is the difference between PDCCH EPRE for CSI-RS EPRE (P _c,PDCCH ) Using (2130-1 to 2130-N) information, PDCCH transmit power (2100-1 to 2100-N) and CSI-RS transmit power (2110-1 to 2110-N) for each beam ) and the transmission power of the PDSCH (2115-1 to 2115-N) can be calculated. Of course, the PDCCH relative transmit power (P _c,PDCCH ), which is the difference between the PDCCH EPRE and the CSI-RS EPRE, may follow a predetermined value (eg, 0 dB). If a communication system using multiple beams in a high frequency band of FR (frequency range) 2 may independently apply downlink transmission power to each beam.

Here, the power offset (2135-1 to 2135-N) information for each beam is the transmission power of the SSB (2100-1 to 2100-N), the transmission power of the PDCCH (2105-1 to 2105-N), and the transmission power of the PDSCH. (2115-1 to 2115-N) may be common.

As such, the IAB node may receive power control configuration information to be used for transmitting the downlink signal from the upper node, and may set the transmission power of the downlink signal for each beam according to the received power control configuration information. At this time, the IAB node may receive from the upper node power offset (2135-1 to 2135-N) information for each beam to be applied during simultaneous DU/MT transmission/reception, and the received power offset (2135-1 to 2135-N) for each beam. N) According to the information, the transmission power to be used for transmitting the downlink signal may be adjusted for each beam. In this case, the IAB-DU may adjust the transmit power to reduce the transmit power of each downlink channel/signal for each beam according to the power offset (2135-1 to 2135-N) information during simultaneous DU/MT transmission/reception. Alternatively, the IAB node may adjust the transmit power to increase the transmit power of each downlink channel/signal for each beam according to the power offset (2135-1 to 2135-N) information for each beam during simultaneous DU/MT transmission/reception. In this case, the IAB node may receive power offset (2135-1 to 2135-N) information for each beam by L1 signaling. Alternatively, the IAB node may receive power offset (2135-1 to 2135-N) information for each beam through a higher layer parameter. Alternatively, the IAB node may receive power offset (2135-1 to 2135-N) information for each beam through a combination of L1 signaling and higher layer parameters.

As such, a signaling structure may be simple for the IAB node to receive power offset information common to the transmission power of the SSB, the transmission power of the PDCCH, and the transmission power of the PDSCH from the upper node to adjust the transmission power. In addition, the signaling burden may be small, and there may be an advantage that the ratio of transmission power between each channel/signal does not change with time. In this case, when the power offset is actually applied to the transmission power of the SSB, the transmission power of the PDCCH, and the transmission power of the PDSCH, the IAB-DU may maintain the P _{c and PDCCH} values by 0 dB. As a result, the IAB node and the upper node can minimize the influence on methods of operation based on the power ratio between the CSI-RS and the PDCCH, such as beam failure detection (BFD). On the other hand, such a method may have an advantage in that the transmission power ratio between each channel/signal can be differently operated in consideration of the characteristics of each beam.

22 is a graph showing a third embodiment of power control information and power adjustment information.

Referring to FIG. 22, the power control information received by the IAB node from the upper node is the transmission power 2200 of the SSB and the PDSCH relative transmission power (P _c ) (2220) information that is the difference between the PDSCH EPRE and the CSI-RS EPRE. , SSB relative transmit power (P _c,SS ) (2225) information, which is the difference of SSB EPRE for CSI-RS EPRE, and PDCCH relative transmit power (P _c,PDCCH ) (2230), which is the difference between PDCCH EPRE for CSI-RS EPRE ) may be information. In this case, the IAB node may receive the SSB transmission power 2200 information from the upper node through the upper layer parameter for SSB block transmission included in the serving cell common configuration signal. And, the IAB node through the upper layer parameter for the power control offset, the PDSCH relative transmit power (P _c ) (2220) information that is the difference between the PDSCH EPRE for the CSI-RS EPRE, and the SSB that is the difference between the SSB EPRE for the CSI-RS EPRE. The relative transmit power (P _c,SS ) 2225 information and PDCCH relative transmit power (P _c,PDCCH ) 2230 information that is the difference between the PDCCH EPRE with respect to the CSI-RS EPRE may be received. In this case, the IAB node transmits the SSB transmit power (2200) information, the PDSCH relative transmit power (P _c ) (2220) information that is the difference between the PDSCH EPRE for the CSI-RS EPRE, and the SSB that is the difference in the SSB EPRE for the CSI-RS EPRE. Relative transmit power (P _c,SS ) (2225) information and the PDCCH relative transmit power (P _c,PDCCH ) (2230) information, which is the difference between the PDCCH EPRE for the CSI-RS EPRE, the transmit power of the PDCCH (2205), The transmission power 2010 of the CSI-RS and the transmission power 2215 of the PDSCH may be calculated. Of course, the PDCCH relative transmit power (P _c,PDCCH ), which is the difference between the PDCCH EPRE and the CSI-RS EPRE, may follow a predetermined value (eg, 0 dB).

Meanwhile, referring to FIG. 22 , the power adjustment information includes power offset (2235-1) information of transmit power of SSB, power offset (2235-2) of transmit power of PDCCH, and power offset (2235–2) of transmit power of PDSCH. 3) may include at least one of information. As such, the power offsets (2235-1, 2235-2, 2235-3) information is applied differently to each of the transmit power 2200 of the SSB, the transmit power 2205 of the PDCCH, and the transmit power 2215 of the PDSCH. can

As such, the IAB node may receive power adjustment information to be used for transmitting the downlink signal from the upper node, and may adjust the transmission power of the downlink signal according to the received power adjustment information. In this case, the IAB node may receive information from the upper node on the power offsets 2235-1, 2235-2, and 2235-3 to be applied during simultaneous DU/MT transmission/reception, and the received power offsets 2235-1, 2235-2, 2235-3) information, it is possible to adjust the transmission powers to be used for transmitting the downlink signal.

In this case, the IAB-DU may adjust the transmit power to reduce the transmit power of each downlink channel/signal according to the power offset (2235-1, 2235-2, 2235-3) information during simultaneous DU/MT transmission/reception. . Alternatively, the IAB-DU may adjust the transmit power to increase the transmit power of each downlink channel/signal according to the power offset (2235-1, 2235-2, 2235-3) information during DU/MT simultaneous transmission and reception. have. In this case, the IAB-DU may receive power offset (2235-1, 2235-2, 2235-3) information by L1 signaling. Alternatively, the IAB-DU may receive power offset (2235-1, 2235-2, 2235-3) information through a higher layer parameter. Alternatively, the IAB-DU may receive power offset (2235-1, 2235-2, 2235-3) information through a combination of L1 signaling and higher layer parameters.

In this way, the IAB-DU is an individual power offset (2235-1, 2235-2, 2235-3) to each of the transmit power 2200 of the SSB, the transmit power 2205 of the PDCCH, and the transmit power 2205 of the PDSCH from the upper node. ), the method of adjusting the transmit power by receiving the information may have an advantage of maximizing the degree of freedom in adjusting the ratio of transmit power between each channel/signal.

23 is a graph showing a fourth embodiment of power control information and power adjustment information.

Referring to FIG. 23 , the power control information received by the IAB node from the upper node is the first PDSCH relative transmit power (P _c ) 2320, which is the difference between the SSB transmit power 2300 information and the PDSCH EPRE with respect to the CSI-RS EPRE. ) information, the first SSB relative transmit power (P _c,SS ) 2325 that is the difference of the SSB EPRE for the CSI-RS EPRE information, and the first PDCCH relative transmit power (P) that is the difference between the PDCCH EPRE for the CSI-RS EPRE _{c, PDCCH} ) 2330 may be information. In this case, the IAB node may receive the SSB transmission power 2300 information from the upper node through the upper layer parameter for SSB block transmission included in the serving cell common configuration signal. And, the IAB node through the upper layer parameter for the power control offset, the first PDSCH relative transmit power (P _c ) (2320) information that is the difference of the PDSCH EPRE for the CSI-RS EPRE, the difference in the SSB EPRE for the CSI-RS EPRE The first SSB relative transmit power (Pc _,SS ) 2325 information and the first PDCCH relative transmit power (Pc, _PDCCH ) 2330 information that is the difference between the PDCCH EPRE for the CSI-RS EPRE may be received. In this case, the IAB node transmits the SSB transmit power (2300) information, the first PDSCH relative transmit power (P _c ) (2320) information that is the difference between the PDSCH EPRE for the CSI-RS EPRE, and the difference in the SSB EPRE for the CSI-RS EPRE. of the PDCCH using the first PDCCH relative transmit power (P _c,PDCCH ) 2330, which is the difference between the first SSB relative transmit power (P _c,SS ) 2325 information and the PDCCH EPRE for the CSI-RS EPRE. The transmit power 2305, the CSI-RS transmit power 2310, and the PDSCH transmit power 2315 may be calculated. Of course, the first PDCCH relative transmit power (P _c,PDCCH ), which is the difference between the PDCCH EPRE and the CSI-RS EPRE, may follow a predetermined value (eg, 0 dB).

Meanwhile, referring to FIG. 23 , the power adjustment information includes the second SSB relative transmit power (P _c,SS2 ) (2335-1) information, which is the ratio of the SSB EPRE to the CSI-RS EPRE, and the PDCCH EPRE for the CSI-RS EPRE. At least one of the second PDCCH relative transmit power (P _c,PDCCH2 ) (2335-2) information that is the difference and the second PDSCH relative transmit power (P _c2 ) (2335-3) information that is the difference between the EPRE for the CSI-RS EPRE may include. As such, the relative transmit powers 2335-1, 2335-2, 2335-3 information is applied differently to each of the transmit power 2300 of the SSB, the transmit power 2305 of the PDCCH, and the transmit power 2315 of the PDSCH, respectively. can do.

As such, the IAB node may receive power adjustment information to be used for transmitting the downlink signal from the upper node, and may adjust the transmission power of the downlink signal according to the received power adjustment information. At this time, the IAB node may receive the relative transmit powers (2335-1, 2335-2, 2335-3) information to be applied during simultaneous DU/MT transmission/reception from the upper node, and the received relative transmit powers (2335-) 1, 2335-2, 2335-3), it is possible to adjust the transmission powers to be used for transmitting the downlink signal according to the information.

In this case, the IAB-DU adjusts the transmit power to reduce the transmit power of each downlink channel/signal according to the relative transmit powers (2335-1, 2335-2, 2335-3) information during simultaneous DU/MT transmission/reception. can Alternatively, the IAB-DU adjusts the transmit power to increase the transmit power of each downlink channel/signal according to the relative transmit powers 2335-1, 2335-2, 2335-3 information during simultaneous DU/MT transmission/reception. can In this case, the IAB-DU may receive the relative transmit powers 2335-1, 2335-2, 2335-3 information by L1 signaling. Alternatively, the IAB-DU may receive the relative transmit powers 2335-1, 2335-2, 2335-3 information through a higher layer parameter. Alternatively, the IAB-DU may receive the relative transmit powers 2335-1, 2335-2, 2335-3 information through a combination of L1 signaling and a higher layer parameter.

In this way, the IAB-DU is the respective relative transmit power 2335-1, 2335-2, 2335- to each of the transmit power 2300 of the SSB, the transmit power 2305 of the PDCCH, and the transmit power 2305 of the PDSCH from the upper node. 3) The method of receiving information and adjusting the transmit power may have an advantage of maximizing the degree of freedom in adjusting the ratio of transmit power between each channel/signal. In this case, the IAB-DU may maintain the P _{c and PDCCH} values at 0 dB. As a result, the IAB node and the upper node can minimize the influence on methods of operation based on the power ratio between the CSI-RS and the PDCCH, such as beam failure detection (BFD).

In actual implementation of the IAB node, the above-described embodiments may not be mutually exclusive, and combinations of various embodiments may be considered. As an example, the IAB node may be implemented by using the DU/MT transmission method and the downlink transmission power adjustment method at the same time. In addition, the IAB node may report to the base station information on which functions are implemented or not implemented among the functions of the embodiment. Based on this, the base station may indicate what operation the IAB node will perform through L1 signaling or a higher layer.

24 is a block diagram illustrating a first embodiment of an IAB-DU.

Referring to FIG. 24 , the IAB-DU may include an IAB-DU processing unit 2400 , an IAB-DU receiving unit 2405 , and an IAB-DU transmitting unit 2410 . The IAB-DU configuration of Figure 24 is an example, and each configuration of the actual IAB-DU may be divided in more detail according to an embodiment of the present disclosure or the intention of the operator, or it may be possible to be configured in an integrated form. The IAB-DU processing unit 2400 may determine and process the overall operation of the IAB-DU, and may store various information and procedures for this, or the IAB-DU receiving unit 2405 to the IAB-DU transmitting unit 2410 transmits a radio signal. It can be controlled to transmit and receive appropriately. In particular, the IAB-DU processing unit 2400 may perform downlink power control of the IAB-DU according to one of the methods of FIGS. 20 to 23 .

25 is a block diagram illustrating a first embodiment of IAB-MT.

Referring to FIG. 25 , the IAB-MT may include an IAB-MT processing unit 2500 , an IAB-MT receiving unit 2505 , and an IAB-MT transmitting unit 2510 . The configuration of FIG. 25 is an example, and each configuration of the actual IAB-MT may be divided in more detail according to an embodiment of the present disclosure or the intention of the operator, or it may be possible to be configured in an integrated form. The IAB-MT processing unit 2500 determines and processes the overall operation of the IAB-MT according to an embodiment of the present disclosure, and may store various information and procedures for this purpose, or the IAB-MT receiving unit 2505 or the IAB-MT transmitting unit 2510 ) can be controlled to properly transmit and receive radio signals. In particular, the IAB-MT processing unit 2500 may receive, from a higher node, signaling on whether to apply downlink power control of the IAB-DU according to one of the methods of FIGS. 20 to 23 , and deliver it to the IAB-DU. .

26 is a block diagram showing a first embodiment of a communication node constituting a communication system.

Referring to FIG. 26 , the communication node 2600 is an IAB node and may include at least one processor 2610 , a memory 2620 , and a transceiver 2630 connected to a network to perform communication. Also, the communication node 2600 may further include an input interface device 2640 , an output interface device 2650 , a storage device 2660 , and the like. Each of the components included in the communication node 2600 may be connected by a bus 2670 to communicate with each other. However, each of the components included in the communication node 2600 may not be connected to the common bus 2670 but to the processor 2610 through an individual interface or an individual bus. For example, the processor 2610 may be connected to at least one of the memory 2620 , the transceiver 2630 , the input interface device 2640 , the output interface device 2650 , and the storage device 2660 through a dedicated interface. .

The processor 2610 may execute a program command stored in at least one of the memory 2620 and the storage device 2660 . The processor 2610 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 2620 and the storage device 2660 may be configured as at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 2620 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).

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 may include hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of 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. 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. In addition, the above-described method or apparatus may be implemented by combining all or part of its configuration or function, or may be implemented separately.

Although the above has been described 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 as set forth in the claims below. You will understand that it can be done.

Claims (20)

A method of operating a first integrated access and backhaul (IAB) node in a communication system, comprising:
receiving information of a power offset from a second IAB node;
deriving a first energy per resource element (EPRE) of a physical downlink shared channel (PDSCH) transmitted by the second IAB node based on the power offset;
transmitting a first message requesting adjustment of the transmission power of the PDSCH to the second IAB node;
Receiving a second message including information on the adjusted transmission power of the PDSCH from the second IAB node; and
and deriving the adjusted EPRE of the PDSCH by applying the adjusted transmit power to the first EPRE. The method according to claim 1,
The method of operation of the first IAB node,
The method of operating a first IAB node, further comprising the step of performing communication with one or more other IAB nodes in consideration of the adjusted EPRE of the PDSCH transmitted by the second IAB node. 3. The method according to claim 2,
The method of operation of the first IAB node, wherein the communication with the one or more other IAB nodes is a simultaneous transmit/receive operation. The method according to claim 1,
The method of operation of the first IAB node,
The method of operating a first IAB node, further comprising: receiving, from the second IAB node, information on one or more beams to which the adjusted transmit power is applied. 5. The method according to claim 4,
The information of the one or more beams is TCI state information or RS (reference signal) resource index, the operating method of the first IAB node. The method according to claim 1,
When information on a beam to which the adjusted transmit power is adjusted is not received, it is assumed that the adjusted transmit power is applied to all beams of the first IAB node. The method according to claim 1,
The first EPRE is derived by applying the power offset to a second EPRE of a CSI-RS (channel state information-reference signal) transmitted by the second IAB node, and the information of the second EPRE is the second IAB node Received from, the method of operation of the first IAB node. The method according to claim 1,
Each of the first message and the second message is a medium access control (MAC) control element (CE), the method of operating a first IAB node. The method according to claim 1,
The first message includes an adjustment value of the transmit power required in the first IAB node, the operating method of the first IAB node. The method according to claim 1,
The second message further includes information on time resources to which the adjusted transmission power is applied, and the time resources are configured in units of slots. A method of operating a second integrated access and backhaul (IAB) node in a communication system, comprising:
transmitting information of a power offset used to derive a first energy per resource element (EPRE) of a physical downlink shared channel (PDSCH) transmitted by the second IAB node to a first IAB node;
receiving a first medium access control (MAC) control element (CE) requesting adjustment of the transmission power of the PDSCH from the first IAB node;
determining the adjusted transmit power of the PDSCH based on the first MAC CE; and
Transmitting a second MAC CE including information on the adjusted transmission power of the PDSCH to the first IAB node,
The adjusted EPRE of the PDSCH is derived by applying the adjusted transmit power to the first EPRE. 12. The method of claim 11,
The method of operation of the second IAB node,
The method of operating a second IAB node, further comprising transmitting information on one or more beams to which the adjusted transmission power is applied to the first IAB node. 13. The method of claim 12,
The information of the one or more beams is TCI state information or RS (reference signal) resource index, the operating method of the second IAB node. 12. The method of claim 11,
The method of operation of the second IAB node,
Further comprising the step of transmitting information of a second EPRE of a CSI-RS (channel state information-reference signal) transmitted by the second IAB node to the first IAB node,
wherein the first EPRE is derived by applying the power offset to the second EPRE. 12. The method of claim 11,
The second MAC CE further includes information on time resources to which the adjusted transmission power is applied, and the time resources are configured in units of slots. As a first integrated access and backhaul (IAB) node in a communication system,
processor;
a memory in electronic communication with the processor; and
Including instructions stored in the memory,
When the instructions are executed by the processor, the instructions are executed by the first IAB node,
receive information of the power offset from the second IAB node;
deriving a first energy per resource element (EPRE) of a physical downlink shared channel (PDSCH) transmitted by the second IAB node based on the power offset;
transmitting a first medium access control (MAC) control element (CE) requesting adjustment of the transmission power of the PDSCH to the second IAB node;
receiving a second MAC CE including information on the adjusted transmission power of the PDSCH from the second IAB node; and
and cause deriving the adjusted EPRE of the PDSCH by applying the adjusted transmit power to the first EPRE. 17. The method of claim 16,
The instructions are that the first IAB node,
operative to further cause the second IAB node to perform communication with one or more other IAB nodes in consideration of the adjusted EPRE of the PDSCH transmitted by the second IAB node. 17. The method of claim 16,
The instructions are that the first IAB node,
and cause receiving from the second IAB node information of one or more beams to which the adjusted transmit power is applied. 19. The method of claim 18,
The information of the one or more beams is TCI state information or RS (reference signal) resource index, the first IAB node. 17. The method of claim 16,
When information on a beam to which the adjusted transmit power is adjusted is not received, it is estimated that the adjusted transmit power is applied to all beams of the first IAB node.

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