KR20180122239A - Power control method for dynamic tdd system - Google Patents

Abstract

This disclosure relates to a communication technique and system thereof that fuses a 5G communication system with IoT technology to support higher data rates than 4G systems. This disclosure is based on 5G communication technology and IoT related technology, and can be applied to intelligent services such as smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, ). ≪ / RTI > Disclosed is a power control method and apparatus capable of solving a DL-to-UL interference problem caused by applying a dynamic TDD (Time Division Duplex) in a wireless communication system.

Description

[0001] POWER CONTROL METHOD FOR DYNAMIC TDD SYSTEM [0002]

The present invention relates to a wireless communication system, and more particularly, to a power control method and apparatus capable of solving a DL-to-UL interference problem caused by applying a dynamic TDD (Time Division Duplex) in a wireless communication system .

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G network) communication system or after a LTE system (Post LTE). To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, in the 5G communication system, beamforming, massive MIMO, full-dimension MIMO (FD-MIMO ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed. In order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed. In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

On the other hand, the Internet is evolving into an Internet of Things (IoT) network in which information is exchanged between distributed components such as objects in a human-centered connection network where humans generate and consume information. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired / wireless communication, network infrastructure, service interface technology and security technology are required. In recent years, sensor network, machine to machine , M2M), and MTC (Machine Type Communication). In the IoT environment, an intelligent IT (Internet Technology) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, and advanced medical service through fusion of existing information technology . ≪ / RTI >

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, a machine to machine (M2M), and a machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas It is. The application of the cloud RAN as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

Recently, a dynamic TDD (Time Division Duplex) system which improves frequency efficiency and latency through different uplink and downlink configurations between base stations reflecting the traffic characteristics of each base station according to the development of LTE (Long Term Evolution) and LTE-Advanced Research is actively being carried out. In this dynamic TDD system, cross-link interference (TRP-to-TRP interference / UE-to-UE interference) occurs, and a transmission power control method and apparatus for controlling the same are needed.

The object of the present invention is to provide a TDD (Time Division Duplex) system that improves frequency efficiency and latency through different uplink and downlink configurations between base stations in consideration of traffic characteristics of each base station, TRP interference / UE-to-UE interference).

According to an aspect of the present invention, there is provided a method of processing a control signal in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; Processing the received first control signal; And transmitting the second control signal generated based on the process to the base station.

According to an embodiment of the present invention, it is possible to manage cross-link interference caused by dynamic TDD through UL / DL power control.

According to another embodiment of the present invention, it is possible to guarantee that the spectral efficiency due to the dynamic TDD is increased by solving the interference problem between the UE and the BS.

According to another embodiment of the present invention, it is possible to efficiently and effectively control cross-link interference, thereby extending a deployment scenario in which dynamic TDD can be applied.

1 is a diagram showing an embodiment of a power control operation scheme considering slot-based transmission direction change.
2 is a diagram showing another embodiment of a power control operation scheme considering slot-based transmission direction change.
3 is a diagram showing another embodiment of a power control operation scheme considering a slot-based transmission direction change.
4 is a diagram for explaining a power control scheme considering UE-to-UE interference.
4A is a diagram for explaining a parameter value determination reflecting a UE-to-UE interference effect.
5A and 5B are diagrams illustrating an operation procedure of a base station and a terminal for a power control scheme considering UE-to-UE interference.
6A and 6B are diagrams showing another embodiment of the operation procedure of a base station and a terminal for a power control scheme considering UE-to-UE interference.
7A and 7B are diagrams showing another embodiment of the operation procedure of the base station and the terminal for the power control scheme considering the UE-to-UE interference.
8 is a diagram illustrating an embodiment of a UE-to-UE interference measurement scheme.
9 shows a UE-to-UE interference measurement procedure for Alt.2 and Alt.3 in FIG.
10 is a diagram showing an example of an interference situation caused by dynamic TDD application.
11A and 11B are diagrams showing an embodiment of a method for controlling cross-link interference by applying power control and link adaptation together (Alt.1-1).
12A and 12B are diagrams showing an embodiment of a method for controlling cross-link interference by applying power control and link adaptation together (Alt.1-2).
13A and 13B are views showing an embodiment of a method for controlling cross-link interference by applying power control and link adaptation together (Alt.2-1).
14A and 14B are diagrams showing an embodiment of a method of controlling cross-link interference by applying power control and link adaptation together (Alt.2-2).
15 is a diagram illustrating an embodiment of a base station operation procedure for a power control scheme considering UE-to-UE interference and base station capability.
16 is a diagram illustrating an embodiment of a terminal operation procedure for a power control scheme considering UE-to-UE interference and a base station capability.
FIG. 17 is a diagram illustrating another embodiment of a UE operation procedure for a power control scheme considering UE-to-UE interference and a base station capability.
18 is a diagram illustrating a structure of a terminal according to an embodiment of the present invention.
19 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of well-known functions and constructions that may obscure the gist of the present invention will be omitted.

In the following description of the exemplary embodiments of the present invention, descriptions of known techniques that are well known in the art and are not directly related to the present invention will be omitted. This is for the sake of clarity of the present invention without omitting the unnecessary explanation.

For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In the drawings, the same or corresponding components are denoted by the same reference numerals.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

At this point, it will be appreciated that the combinations of blocks and flowchart illustrations in the process flow diagrams may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, so that those instructions, which are executed through a processor of a computer or other programmable data processing apparatus, Thereby creating means for performing functions. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory The instructions stored in the block diagram (s) are also capable of producing manufacturing items containing instruction means for performing the functions described in the flowchart block (s). Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in the flowchart block (s).

In addition, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative implementations, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may actually be executed substantially concurrently, or the blocks may sometimes be performed in reverse order according to the corresponding function.

Herein, the term " part " used in the present embodiment means a hardware component such as software or an FPGA or an ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

Efforts are underway to develop an improved 5G communication system after commercialization of the 4G communication system.

The main characteristic of the 5G communication system is to support various service scenarios with different requirements compared to the 4G communication system. Here, the requirements may mean latency, data rate, battery life, number of concurrent users, coverage, and the like.

For example, the enhanced Mobile Broadband (eMBB) service aims at a data transmission rate that is 100 times or more higher than that of a 4G communication system and can be regarded as a service for supporting a surge of user data traffic.

As another example, URLL (Ultra Reliable and Low Latency) service aims at very high data transmission / reception reliability and very low latency compared to 4G communication system. -health, drones, and so on.

As another example, the massive Machine-Type-Communication (mMTC) service aims to support a greater number of inter-device communications per single area compared to a 4G communication system, while the 4G MTC It is an evolved service.

The present invention relates to a DL-to-UL interference problem caused by a dynamic TDD (Time Division Duplex) applied to reduce frequency efficiency and latency in an environment where various services capable of supporting the 5G communication system coexist To a power control method and apparatus capable of solving the above problems.

The transmission power control for a physical uplink shared channel (PUSCH) of an LTE cellular communication system is expressed by Equation (1) below.

는 경로손실 (path-loss)을 보상하기 위한 값으로,

와

의 경우, 기지국은 {0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1} 중의 하나의 값을 3-bit 정보를 통해 cell-specific하게 셀 내의 모든 단말에게 알려준다.

= 1 값을 사용한다.Equation (1) represents the transmission power P _PUSCH (i) of a Physical Uplink Shared Channel (PUSCH), which is a physical channel for uplink data transmission in the i th subframe of the UE. At this time, P _{0 _ PUSCH} is the value of the base station indicating to the mobile station through the _PUSCH + P ₀ P _{0 _NOMINAL_ UE _ _} is a parameter consisting of a _{PUSCH higher layer signaling (RRC signaling)} . In particular, P _{0 _NOMINAL_ PUSCH} are cells consisting of 8-bit information - has a [-126, 24] dB with the range of specific (cell-specific) value. In addition, P _{0 _NOMINAL_ PUSCH} is 4-bit information consisting of the terminal - has a specific (UE-specific) to the value [-8, 7] dB range. The cell-specific value is transmitted by the base station through the cell-specific RRC signaling (SIB: System Information Block), and the UE-specific value is transmitted to the mobile station by the dedicated RRC signaling. More specifically, j = 0 means a semi-persistent grant, j = 1 means a dynamic scheduled grant, and j = 2 means a PUSCH grant for a random access response. . Meanwhile,

Is a value for compensating a path loss,

Wow

, The base station informs all terminals in the cell in a cell-specific manner through the 3-bit information of one of {0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1}.

= 1 is used.

PL is a path loss value calculated by the UE, and is calculated based on the received power of a cell-specific reference signal (CRS) of the downlink channel transmitted by the base station. More specifically, the base station transmits reference signal power and filtering coefficient to the UE through UE-specific or cell-specific RRC signaling, and the UE calculates path loss as follows based on the reference signal power and filtering coefficient.

는 MCS에 관련된 값으로 다음과 같이 구성된다.

Is a value related to the MCS as follows.

은 상향링크 제어정보가 UL-SCH 데이터 없이 PUSCH로 전송되는 경우에 한해

값을 가지며, 나머지 경우에 대해

을 사용한다. Ks is a value given by a higher layer parameters, deltaMCS -Enabled, (Bits per Resource Element) BPRE can be calculated as follows.

Only when uplink control information is transmitted on the PUSCH without UL-SCH data

Value, and for the remaining cases

Lt; / RTI >

C is the number of code blocks, K _r is the size of the code block 'r', O _CQI is the number of CQI / PMI bits including CRC, and N _RE is the number of resource elements.

f (i) is a parameter for performing power control in a closed-loop, and may be different depending on whether accumulation-based power control or absolute value-based power control is performed. Whether accumulation-based power control or absolute value-based power control is performed is transmitted to the UE through higher layer signaling (dedicated RRC signaling). For example, when Accumulation-enabled = on, the terminal performs accumulation-based power control. When Accumulation-enabled = off, the terminal performs absolute value-based power control.

로 동작한다. 즉, i-번째 subframe에서 f(i)는 이전 subframe (즉, i - 1번째 subframe)에서 사용한 f(i-1) 값에

번째 subframe에서 하향링크 제어채널 (PDCCH: Physical Downlink Control Channel)을 통해 DCI로 단말에게 전송했던

값을 accumulation해서 사용하게 된다. FDD 시스템에서

이며, TDD 시스템에서 K _PUSCH 는 DL/UL Configuration에 따라 서로 다른 값을 가질 수 있다.Accumulation-based power control

. That is, in the i-th subframe, f (i) is the value of f (i-1) used in the previous subframe

Th subframe to the UE through the PDCCH (Physical Downlink Control Channel)

It is used by accumulation of the value. In the FDD system

And the K _PUSCH in the TDD system may have different values depending on the DL / UL configuration.

로 동작한다. 즉, i-번째 subframe에서

는

번째 subframe에서 하향링크 제어채널 (PDCCH: Physical Downlink Control Channel)을 통해 DCI로 단말에게 전송했던

값을 accumulation 없이 바로 사용하게 된다. FDD 시스템에서

이며, TDD 시스템에서

는 Table 1-a와 같이 DL/UL Configuration에 따라 서로 다른 값을 가질 수 있다.Absolute value based power control

. That is, in the i-th subframe

The

Th subframe to the UE through the PDCCH (Physical Downlink Control Channel)

The value is used immediately without accumulation. In the FDD system

, And in the TDD system

Can have different values depending on the DL / UL configuration as shown in Table 1-a.

값은 DCI format에 따라 달라질 수 있다. 예를 들어, DCI format 0, 3, 그리고 4의 경우 Table 1-b의 값을 사용하고, DCI format 3A의 경우 Table 1-c의 값을 사용한다.Used for Accumulation-based power control and Absolute value-based power control

The value may vary depending on the DCI format. For example, use the values in Table 1-b for DCI formats 0, 3, and 4, and the values in Table 1-c for DCI format 3A.

Meanwhile, the transmission power control for a physical uplink control channel (PUCCH) of the LTE cellular communication system is expressed by Equation (5) below.

를 나타낸 것이다. 이때,

는

로 구성된 파라미터 이며 higher layer signaling (RRC signaling)을 통해 기지국이 단말에게 알려주는 값이다. 특히, 는 8-bit 정보로 구성된 셀-특정 (cell-specific)한 값으로 [-126, 24]dB의 범위를 갖는다. 또한

는 4-bit 정보로 구성된 단말-특정 (UE-specific)한 값으로 [-8, 7]dB의 범위를 갖는다. Cell-specific한 값은 Cell-specific RRC signaling (SIB: System Information Block)을 통해 기지국이 전송하며, UE-specific한 값은 dedicated RRC signaling을 통해 기지국이 단말로 전송한다. 한편, PUSCH의 송신전력 제어와 달리, PUCCH 송신전력 제어에서는 경로 손실을 보상하는

가 사용되지 않는다. Equation (5) is a transmission power of a Physical Uplink Control Channel (PUCCH), which is a physical channel for transmitting uplink control information in an i < th > subframe of the UE,

. At this time,

The

And is a value that the BS informs the UE through higher layer signaling (RRC signaling). Especially, Is a cell-specific value composed of 8-bit information and has a range of [-126, 24] dB. Also

Is a UE-specific value composed of 4-bit information and has a range of [-8, 7] dB. The cell-specific value is transmitted by the base station through the cell-specific RRC signaling (SIB: System Information Block), and the UE-specific value is transmitted to the mobile station by the dedicated RRC signaling. On the other hand, unlike the transmission power control of the PUSCH, in the PUCCH transmission power control,

Is not used.

은 PUSCH의 송신전력 제어에서와 마찬가지로, 기지국이 전송하는 하향링크 채널의 CRS (Cell-specific Reference Signal)의 수신 전력을 통해 계산한다. 보다 구체적으로, 기지국은 UE-specific 또는 Cell-specific RRC signaling을 통해 referenceSignalPower 및 filtering coefficient를 단말로 전송하며, 이를 기반하여 단말은 경로 손실을 [수학식 2]와 같이 계산한다.The path loss value calculated by the UE

Is calculated based on the received power of the cell-specific reference signal (CRS) of the downlink channel transmitted by the base station, as in the transmission power control of the PUSCH. More specifically, the base station transmits a reference signal power and a filtering coefficient to the UE through UE-specific or cell-specific RRC signaling, and the UE calculates a path loss according to Equation (2).

는 higher layer signaling (Cell-specific or UE-specific RRC signaling)을 통해 단말로 전송되며, PUCCH의 format에 따라 가변하는 값으로 PUCCH format 1a (1-bit HARQ-ACK/NACK 전송)을 기준으로 상대적인 값을 진다.

값은 Table 1-d와 같이 구성된다.

Is transmitted to the UE through higher layer signaling (Cell-specific or UE-specific RRC signaling), and a relative value based on the PUCCH format 1a (1-bit HARQ-ACK / NACK transmission) .

The values are organized as shown in Table 1-d.

는 PUCCH가 2-antanna ports로 전송되는 경우 (즉, SFBC: Space Frequency Block Code) higher layer signaling (Cell-specific or UE-specific RRC signaling)을 통해 단말로 전송되며, PUCCH의 format에 따라 가변하는 값이다. SFBC가 사용되지 않는 경우,

이다.

Is transmitted to the UE through higher layer signaling (SFBC: Space-Frequency Block Code) or cell-specific (UE-specific RRC signaling) when the PUCCH is transmitted to the 2-antanna ports, to be. If SFBC is not used,

to be.

값은 Table 1-e와 같이 구성된다.

The values are as shown in Table 1-e.

는 PUCCH format에 따라 다른 값이 사용되며, 이때

는 channel quality information의 피드백에 사용되는 비트수를 의미하고,

는 HARQ-ACK/NACK 피드백에 사용되는 비트수, 그리고

는 Scheduling Request의 피드백에 사용되는 비트로서 0 또는 1이다. 보다 구체적으로, PUCCH format 1, 1a, 그리고 1b에서

이다. PUCCH format 2, 2a, 그리고 2b에서 Normal CP를 사용하는 경우,

는 다음과 같다.

A different value is used depending on the PUCCH format,

Denotes the number of bits used for feedback of channel quality information,

Is the number of bits used for HARQ-ACK / NACK feedback, and

Is the bit used for the feedback of the Scheduling Request and is 0 or 1. More specifically, in PUCCH formats 1, 1a, and 1b

to be. When using Normal CP in PUCCH formats 2, 2a, and 2b,

Is as follows.

는 다음과 같다.If you use Extended CP in PUCCH format 2,

Is as follows.

는 다음과 같다.In PUCCH format 3

Is as follows.

는 Closed-loop으로 전력제어를 수행하기 위한 파라미터이며, 기지국은 UE-specific하게 PUCCH 전송전력을 Correction할 수 있다. PUCCH 전송전력 제어에서는 PUSCH의 전송전력 제어와 달리, accumulation 기반의 송신전력 제어만이 이루이지며,

는 [수학식 9]와 같이 주어진다.

Is a parameter for performing power control in a closed-loop, and the base station can perform UE-specific PUCCH transmission power correction. In PUCCH transmission power control, unlike PUSCH transmission power control, only accumulation-based transmission power control is performed,

Is given by Equation (9).

는 이전 subframe (즉, i - 1번째 subframe)에서 사용한

값에

번째 subframe에서 하향링크 제어채널 (PDCCH: Physical Downlink Control Channel)을 통해 DCI로 단말에게 전송했던

값을 accumulation해서 사용하게 된다. FDD 시스템에서

이며, TDD 시스템에서

는 [Table 1-f]와 같이 DL/UL Configuration에 따라 서로 다른 값을 가질 수 있다.That is, in the i-th subframe

Is used in the previous subframe (i. E., The first subframe)

To the value

Th subframe to the UE through the PDCCH (Physical Downlink Control Channel)

It is used by accumulation of the value. In the FDD system

, And in the TDD system

Can have different values depending on the DL / UL configuration as in [Table 1-f].

값은 DCI format에 따라 달라질 수 있으며, DCI format 1A/1B/1D/1/2A/2B/2C/2/3에 대해서는 Table 1-b의 accumulated

와 동일한 값을 사용하며, DCI format 3A의 경우,

값은 Table 1-c에서 사용한

값과 동일한 값을 사용한다.

The values may vary depending on the DCI format, and for the DCI format 1A / 1B / 1D / 1 / 2A / 2B / 2C / 2/3,

And in case of DCI format 3A,

The values used in Table 1-c

Use the same value as the value.

The main purpose of the uplink transmission power control of the UE is to minimize the amount of interference caused by the adjacent cells and to minimize power consumption of the UE. Also, the strength of the received signal received by the base station is maintained constant regardless of the position of the terminal in the cell, so that the transmission signal of the terminal enters the dynamic range of the AGC (Automatic Gain Control) of the base station. This transmission power control can be used for overcoming interference between base stations in a flexible / dynamic TDD system. That is, the SINR of the uplink signal is lowered due to inter-base station interference, and transmission power control can be used to improve the SINR value. When the transmission power control is performed to solve the inter-base station interference problem, the interference to the DL UE of the neighbor base station should also be considered. This patent proposes an effective transmit power control scheme considering both inter-base station interference problem and inter-terminal interference problem simultaneously. The following points are considered when designing such a transmission power control scheme.

· 1. Slot-based transmission direction change

- Increased interference management difficulty due to rapid change of interference environment

- Faster power control required

· 2. Requires power control considering UE-to-UE interference

· 3. Applying advanced interference management scheme (e.g. LBT-like, Interference cancellation / suppression (IC / IS)

- Sensing information can be reflected in power control

- Use the IC / IS, which is a receiving function that can be performed by the base station

Three transmission power control schemes are proposed according to the consideration of the above considerations. First, we describe the transmission power control scheme considering slot-based transmission direction change.

또는/와

값을 사용하여 power control 을 수행한다. power control parameter set1과 set2는 아래와 같이 표현될 수 있다. 1 is a diagram showing an embodiment of a power control operation scheme considering slot-based transmission direction change. If the UE is configured with a higher layer parameter UplinkPowerControlDedicated2 (power control parameter set2) for the serving cell and the slot / subframe i is uplink power control slot / subframe set 2 (indication by DCI, slot requiring UL power control considering cross- / subframe), it belongs to set2

Or / and

Use the value to perform power control. The power control parameters set1 and set2 can be expressed as:

값만 달라 질 수도 있고,

값만 달라 질 수도 있고,

값과

값 모두 달라 질 수 있다. 적용할 power control parameter set은 도 1과 같은 절차에 의해 결정된다. 먼저, RRC signaling을 통해 power control parameter sets 정보를 단말로 전송하고, backhaul/OTA를 통해 기지국 間 transmission direction 정보 교환하고, 인접 기지국과 해당 기지국의 transmission direction 정보를 기반으로 적용할 power control parameter set 결정한다. 그리고 나서 기지국은 단말로 1-bit DCI 정보를 통해 적용 power control parameter set indication을 전송한다. 단말은 0을 수신하면 power control parameter set1을 적용하고, 1을 수신하면 power control parameter set2를 적용한다. Power control parameter set2 is compared to set1

The value may vary,

The value may vary,

Value and

All values can be different. The power control parameter set to be applied is determined by the procedure shown in Fig. First, power control parameter sets are transmitted to the mobile station through RRC signaling, and transmission direction information is exchanged between base stations through backhaul / OTA, and a power control parameter set to be applied based on the transmission direction information of the neighbor base station and the base station is determined . The base station then transmits the applied power control parameter set indication to the terminal through the 1-bit DCI information. When the terminal receives 0, it applies the power control parameter set1. When the terminal receives 1, it applies the power control parameter set2.

또는/와

값을 사용하여 power control를 수행한다. 예를 들면 reference transmission direction이 DL이고 할당된 transmission direction이 UL인 경우에 UL power control parameter set 2 적용이 가능하다. 적용 할 power control parameter set은 도 2와 같은 절차에 의해 결정된다. 먼저, RRC signaling을 통해 power control parameter sets 정보를 단말로 전송하고, backhaul를 통해 기지국 間 semi-static/reference transmission direction 정보 공유 및 RRC signaling을 통해 frame(subframe group) 단위의 reference transmission direction 정보를 단말로 전달한다. 그리고 나서 UL/DL traffic이나 서비스를 고려하여 적용 transmission direction 결정하고 DCI 정보를 통해 적용 transmission direction 정보를 단말로 전달한다. 단말은 해당 slot의 전송 방향 (transmission direction)과 reference 전송 방향 정보를 이용하여 UL power control parameter set을 결정한다. 즉, 해당 slot의 전송 방향 (transmission direction)과 reference 전송 방향이 서로 같으면 power control parameter set1을 적용하고, 해당 slot의 전송 방향 (transmission direction)과 reference 전송 방향이 다르면 power control parameter set2를 사용한다. 도 3은 slot-based transmission direction 변경을 고려한 power control 운용 방안에 대한 한 실시 예로 각 기지국이 독립적으로 UL/DL direction을 변경할 때 발생할 수 있는 UL/DL 조합의 예를 보여주고 있다. BS2는 UL이면서 reference와 동일한 transmission direction을 갖는 경우엔 power control parameter set1을 사용하고, UL이면서 reference와 다른 transmission direction을 갖는 경우엔 power control parameter set2는 사용한다. 도2와 도3에서 보여준 실시 예는 기지국 間 변경된 transmission direction정보 교환 없이 power control이 이루어진다. 도 3에서 reference가 UL이고 BS1이 DL 변경하고 BS2가 UL로 변경하는 경우는 제외하고는 TRP-to-TRP 간섭 문제를 해결 할 수 있다. Reference가 UL이고 BS1이 DL 변경하고 BS2가 UL로 변경하는 경우에는 direction을 바꾸는 기지국에서 DL power control 수행하게 함으로써 인접 UE로의 DL-to-UL 간섭을 회피 할 수 있다. 다시 말해 cross-link 간섭 문제가 해결하기 위해 power control을 적용하는 경우, reference transmission direction을 기준으로 transmission direction을 변경하는 cell에 속한 단말/기지국이 인접 cell의 단말/기지국의 간섭 영향을 고려하여 UL/DL power control을 수행하게 함으로써, 인접 기지국 間 실시간으로 변경된 slot의 transmission direction 정보를 교환 없이도 power control을 통해 slot 단위로 dynamic 하게 transmission direction 변경으로 발생하는 cross-link interference를 효과적으로 제어 할 수 있다. 2 is a diagram showing another embodiment of a power control operation scheme considering slot-based transmission direction change. If the UE is configured with a higher layer parameter UplinkPowerControlDedicated2 (power control parameter set2) for the serving cell and the slot / subframe i is indirectly controlled by the UL power control slot / subframe set 2 (UL Power control considering cross- Subframe), it belongs to set2

Or / and

Use the value to perform power control. For example, if the reference transmission direction is DL and the assigned transmission direction is UL, UL power control parameter set 2 is applicable. The power control parameter set to be applied is determined by the procedure shown in FIG. First, power control parameter sets are transmitted to the mobile station through RRC signaling, and reference transmission direction information in a frame (subframe group) unit is transmitted to the mobile station through semi-static / reference transmission direction information sharing and RRC signaling between the base stations through the backhaul . Then, it determines the applied transmission direction considering UL / DL traffic or service and transmits applied transmission direction information to the terminal through DCI information. The UE determines the UL power control parameter set using the transmission direction of the slot and the reference transmission direction information. That is, if the transmission direction of the corresponding slot is the same as the reference transmission direction, the power control parameter set 1 is applied. If the transmission direction of the corresponding slot is different from the reference transmission direction, the power control parameter set 2 is used. FIG. 3 shows an example of a UL / DL combination that can be generated when each base station changes its UL / DL direction independently in an embodiment of a power control operation scheme considering slot-based transmission direction change. BS2 uses power control parameter set1 when it is UL and has the same transmission direction as the reference, and power control parameter set2 is used when UL has a transmission direction different from the reference. In the embodiment shown in FIG. 2 and FIG. 3, power control is performed without exchanging transmission direction information changed between base stations. In FIG. 3, the TRP-to-TRP interference problem can be solved except when the reference is UL, BS1 is changed to DL, and BS2 is changed to UL. If the reference is UL and BS1 is changed to DL and BS2 is changed to UL, DL power control is performed by the base station changing direction so that DL-to-UL interference to neighboring UEs can be avoided. In other words, when the power control is applied to solve the cross-link interference problem, the terminal / base station belonging to the cell which changes the transmission direction based on the reference transmission direction considers the interference of the terminal / By performing DL power control, it is possible to effectively control the cross-link interference caused by changing the transmission direction dynamically in slots by power control without exchanging the transmission direction information of slots changed in real time between adjacent base stations.

4 is a diagram for explaining a power control scheme considering UE-to-UE interference. When using the power control parameter set 2 as the second power control method, a method of determining the transmission power considering UE-to-UE interference can be considered. As shown in FIG. 4, there are two cases according to UE-to-UE interference in case of TRP-to-TRP interference. First, if neighbor base stations have different transmission directions and it is determined that there is no UE-to-UE interference as in case 1, UL power control is performed using the power control parameter set 2 according to the following equation.

와

는 DL-to-UL 간섭 (즉, TRP-to-TRP 간섭)을 고려하여 결정되는 power control parameter set2에 해당한다. 그리고 case2와 인접 기지국이 서로 다른 transmission direction을 갖고 UE-to-UE 간섭을 무시할 수 없을 정도로 상당히 큰 경우 power control parameter set1과 set2를 이용하여 아래와 같은 수식을 따라 UL power control을 수행한다. In Equation (10)

Wow

Corresponds to a power control parameter set 2 determined in consideration of DL-to-UL interference (i.e., TRP-to-TRP interference). If case 2 and neighbor base stations have different transmission directions and the UE-to-UE interference is so large that it can not be ignored, perform UL power control according to the following equation using power control parameter set 1 and set 2.

와

는 DL-to-UL 간섭 (즉, TRP-to-TRP 간섭)을 고려하여 결정되는 power control parameter set2에 해당하는 값들이고,

와

는 인접한 셀의 UL 신호에 의한 serving cell의 UL 신호에 대한 간섭을 고려하여 결정되는 power control parameter set1에 해당하는 값들이다. [수학식 11] 에서

는 0보다 작은 값으로, UE-to-UE 간섭 영향을 반영하기 위한 parameter로 아래와 같은 방안들로 결정될 수 있다 (

인 경우).

인 경우에 대해서는 이후에 기술한다. In Equation (11)

Wow

Is a value corresponding to a power control parameter set 2 determined in consideration of DL-to-UL interference (i.e., TRP-to-TRP interference)

Wow

Are values corresponding to a power control parameter set 1 determined in consideration of interference with a UL signal of a serving cell by a UL signal of an adjacent cell. In Equation (11)

Is a value less than 0 and is a parameter for reflecting the influence of UE-to-UE interference and can be determined as follows (

.

Will be described later.

· Method 1: Determine Parameter Value to Reflect UE-to-UE Interference

는 UE-to-UE 간섭을 의미하고 (채널의 reciprocity 가정)

는 인접 기지국에 의한 DL-to-DL 간섭을 의미한다. UE-to-UE (UL-to-DL)간섭은 간섭 UE가 sensing 을 통해 알 수 있으나, DL-to-DL 간섭 값은 간섭 받는 UE가 알 수 있으므로 이 정보를 간섭 UE에게 전달해야 한다. 이러한 방법을 이용하는 경우 정보 공유로 발생하는 시간 지연으로 실시간 반영에 어려움이 있을 수 있다.here

Means UE-to-UE interference (channel reciprocity assumption)

Means DL-to-DL interference by an adjacent base station. The UE-to-UE (UL-to-DL) interference can be detected by the interfering UE, but the DL-to-DL interference value must be transmitted to the interfering UE because the interfering UE knows. In case of using this method, it may be difficult to reflect in real time due to time delay caused by information sharing.

· Method 2: Determine Parameter Value to Reflect UE-to-UE Interference

는 아래의 그림과 같이 UE-to-UE 간섭을 의미하고

는 도 4a와 같이 serving 기지국의 신호 세기 즉, RSRP (reference signal received power)를 의미한다. here

Means UE-to-UE interference as shown in the figure below.

As shown in FIG. 4A, a signal strength of a serving base station, that is, a reference signal received power (RSRP).

와

사이의 오차만큼 부정확한 power control을 수행하게 된다. 즉, 일반적으로

가

보다 큰 값을 가짐으로 [수학식 11] 에서

값에 더 작은 값이 반영될 수 있다. 이러한 점을 고려한 방법이 방법 3이다. in this case

Wow

The power control is performed inaccurately. That is,

end

(11) < RTI ID = 0.0 >

The value may reflect a smaller value. This is the method 3 that takes account of this point.

· Method 3: Determine Parameter Value to Reflect UE-to-UE Interference

와

사이의 차를 고려하여 추가적인 Margin을 추가하는 방법으로

를

로 대체할 수 있으며 아래의 수학식과 같이 표현된다. Considering the errors of Method 1 and Method 2,

Wow

By adding additional margins considering the difference between

To

And can be expressed by the following equation.

는 potential UE-to-UE 간섭 정보에 기반하여 선택 가능하다. 예를 들면 {0,-1, -2,-3} (dB) 값들 중 하나를 선택하여 사용 가능하다.

이면 UL power control parameter set1를 적용하여 UL 전송하고,

이면 UL 전송 포기 하는 opportunistic transmission 수행할 수 있다.

인 경우라도 그 크기가 크지 않으면 set1을 적용해서 UL 전송을 수행하고 UE-to-UE 간섭이 상당히 큰 것으로 판단이 되면 (예를 들면 potential UE-to-UE 간섭이 RSRP 와 유사하면) UL 전송을 포기한다. UL 전송을 포기하는 경우에는 단말은 PDCCH 또는 PDSCH를 통해 기지국으로 이전 할당 받은 UL 자원을 통한 전송을 수행하지 못했다는 사실을 알리는 1-bit indication과 함께 SR (scheduling request)을 다시 전송한다. 또는 1-bit indication으로 SR을 함께 함축적으로 요청할 수 있다. In the above formula

Is selectable based on potential UE-to-UE interference information. For example, one of the values {0, -1, -2, -3} (dB) can be selected and used.

UL transmission is performed by applying UL power control parameter set 1,

It is possible to perform an opportunistic transmission in which the UL transmission is abandoned.

If the UE-to-UE interference is considerably large (for example, potential UE-to-UE interference is similar to RSRP), UL transmission is performed by applying set 1 if the size is not large I give up. In the case of discarding the UL transmission, the UE transmits a scheduling request (SR) again with a 1-bit indication indicating that it has failed to transmit through the UL resource previously allocated to the base station through the PDCCH or the PDSCH. Alternatively, the SR can be implicitly requested with a 1-bit indication.

5A and 5B are diagrams illustrating an operation procedure of a base station and a terminal for a power control scheme considering UE-to-UE interference. First, power control parameter sets are transmitted to the mobile station through RRC signaling, and transmission direction information is exchanged between base stations through backhaul / OTA, and a power control parameter set to be applied based on the transmission direction information of the neighbor base station and the base station is determined . The base station then transmits the applied power control parameter set indication to the terminal through the 1-bit DCI information. The UE first receives power control parameter sets information and applied power control parameter indication information and determines whether the applied power control parameter indicator is 1 or 0. If the power control parameter indicator is 0, the power control parameter set 1 is applied. If 1, the potential UE-to-UE interference is measured. If the power control parameter is less than a specific threshold, The power control parameters set 2 and set 1 are used together to determine the transmission power.

6A and 6B are diagrams illustrating an operation procedure of a base station and a terminal for a power control scheme considering UE-to-UE interference. First, power control parameter sets are transmitted to the mobile station through RRC signaling, and reference transmission direction information in a frame (subframe group) unit is transmitted to the mobile station through semi-static / reference transmission direction information sharing and RRC signaling between the base stations through the backhaul Transfer. Then, it determines the applied transmission direction considering UL / DL traffic or service and transmits applied transmission direction information to the terminal through DCI information. The terminal receives the power control parameter sets information, the reference transmission direction and the applied transmission direction information, and determines whether the transmission direction of the corresponding slot is the same as the reference transmission direction. If it is determined that the transmission direction of the corresponding slot is the same as the reference transmission direction, the transmission power is determined using the power control parameter set 1. If it is determined that the transmission direction of the corresponding slot is different from the reference transmission direction, it is determined whether the measured UE-to-UE interference is greater or less than a specific threshold. If the measured UE-to-UE interference is less than a certain threshold, the transmission power is determined using the power control parameter set 2. If the measured UE-to-UE interference is greater than a specific threshold, the power control parameter set 2 and set 1 are used together as shown in Equation (11) .

7A and 7B are diagrams illustrating another embodiment of the operation procedure of the base station and the terminal for the power control scheme considering the UE-to-UE interference. First, power control parameter sets are transmitted to the UE through RRC signaling, and information is exchanged between base stations through backhaul / OTA. UE-to-UE interference, TRP-to-TRP interference, Determine the power control parameter set to be applied based on the transmission direction information. The base station then transmits the applied power control parameter set indication to the terminal through the 1-bit DCI information. The UE first receives power control parameter sets information and applied power control parameter indication information and determines whether the applied power control parameter indicator is 1 or 0. If the applied power control parameter indicator is 0, apply power control parameter set 1. If it is 1, perform UL transmission using power control parameter set2. It is possible to define a new TPC component to be transmitted to the UE through a MAC CE or a DCI considering a UE-to-UE and a TRP-to-TRP interference component. In this case, the UL power control equation can be expressed as:

는 RRC를 통해 전송되는 power control parameter set 1 또는 set2에 반영하기 어려운 short-term UE-to-UE 및 TRP-to-TRP 간섭 성분을 반영한다. UE-to-UE 간섭이 존재하지 않는 경우,

는 short-term TRP-to-TRP 간섭 성분을 반영한다. 또한 TRP-to-TRP 간섭이 없는 경우

는 short-term UE-to-UE 간섭 성분을 반영한다. 만일 RRC를 통해 하나의 power control parameter set만 전송되는 경우,

는 TRP-to-TRP 간섭 또는/과 UE-to-UE 간섭을 반영하는 단일 factor로도 사용될 수 있다. 이러한 경우

는 RRC 또는/와 MAC CE 또는/와 DCI (L1 signaling)을 통해 단말에게 configuration 될 수 있다. here

Reflects the short-term UE-to-UE and TRP-to-TRP interference components that are difficult to reflect in the power control parameter set 1 or set 2 transmitted via the RRC. If there is no UE-to-UE interference,

Reflects the short-term TRP-to-TRP interference component. If there is no TRP-to-TRP interference

Reflects the short-term UE-to-UE interference component. If only one power control parameter set is transmitted through RRC,

May also be used as a single factor reflecting TRP-to-TRP interference and / or UE-to-UE interference. In this case

May be configured to the UE via RRC or / and MAC CE or / and DCI (L1 signaling).

값을 결정하여 단말에게 전달할 수 있다. For example, if both TRP-to-TRP interference and UE-to-UE interference are present, apply the power control parameter set

And transmit it to the terminal.

는 here

The

와 같이 표현될 수 있다.

Can be expressed as

는 UE-to-UE 간섭의 power를 나타내고,

는 인접 DL 에 의한 DL 신호에 대한 간섭의 power를 나타낸다. In the above equation

Represents the power of UE-to-UE interference,

Represents the power of the interference to the DL signal due to the adjacent DL.

는 TRP-to-TRP 간섭 성분을 반영한다. 이 경우 다음과 같이 표현될 수 있다. If there is no UE-to-UE interference in Equation 13,

Reflects the TRP-to-TRP interference component. In this case, it can be expressed as follows.

는 TRP-to-TRP 간섭의 power를 나타내고,

는 인접 UL UE에 의한 UL 신호에 대한 간섭의 power를 나타낸다. In the above equation

Represents the power of the TRP-to-TRP interference,

Represents the power of the interference on the UL signal by the adjacent UL UE.

는 UE-to-UE 간섭 성분을 반영한다.If there is no TRP-to-TRP interference in Equation (13)

Reflects the UE-to-UE interference component.

는 UE-to-UE 간섭의 power를 나타내고,

는 인접 DL 에 의한 DL 신호에 대한 간섭의 power를 나타낸다. In the above equation

Represents the power of UE-to-UE interference,

Represents the power of the interference to the DL signal due to the adjacent DL.

FIG. 8 shows an embodiment of a UE-to-UE interference measurement scheme. FIG. 8 (a) is a first alternative (Alt. 1) in which a UL terminal detects a potential power level of a DL of a neighboring base station through sensing before performing UL, Indirectly estimate interference. In this case, it is difficult to distinguish the DL / UL signal, which may cause the transmission power to be increased or decreased more than necessary. FIG. 8B shows a slot (frame) structure for performing a UE-to-UE interference measurement using a sensing RS, and a potential interfering UE transmits a sensing RS to a potential interfered UE in a second alternative (Alt.2) have. In this case, identification information can be assigned to the sensing RS to distinguish the DL / UL signal, thereby enabling more accurate power control. FIG. 8 (c) is a third alternative for UE-to-UE interference measurement (Alt. 3). In this case, the potential interfering UE performs UE-to-UE interference measurement using the DL RS (DMRS / CSI-RS) of the neighbor base station. In order to perform this, RNTI information and precoding information for an adjacent DL UE may be required.

FIG. 9 shows a UE-to-UE interference measurement procedure for Alt.2 and Alt.3 in FIG. First, the resources for the clear channel assessment (CCA) / listen to talk (LBT) are coordinated between the base stations and the RS information is shared, and the potential interfered UEs are sensing RS through the promised resources and the potential interfering UE transmits the resources through promised resources And performs sensing on the transmitted RS.

가 사용되지 않을 수 있다. PUSCH를 통해 data와 UCI(Uplink control information)을 함께 전송하는 경우나 한 UE가 PUSCH와 PUCCH를 동시에 전송되는 경우도 앞서 설명한 바와 같이 UE-to-UE 간섭 정도에 따라 도 5b와 도 6b에서 기술된 단말 동작을 수행할 수 있다. 또 다른 방안을 UCI에 priority를 부여하는 방안이다. 먼저 만일 UE가 UCI를 포함하는 PUSCH를 전송하는 경우엔 potential TRP-to-TRP 간섭이 존재하는 경우 UE-to-UE 간섭에 관계없이 아래와 같이 set 2를 적용한다. What has been described so far is mainly the PUSCH to which data is transmitted. Similarly, the power control parameters of set1 or / and set2 can be applied to the PUCCH. Unlike PUSCH transmission power control, PUCCH transmission power control compensates for path loss

May not be used. In the case of transmitting data and UCI (Uplink control information) together through the PUSCH or when a UE is simultaneously transmitting the PUSCH and the PUCCH, as described above, according to the degree of UE-to-UE interference, Terminal operation can be performed. Another option is to assign priority to UCI. First, if a UE transmits a PUSCH including a UCI, if there is a potential TRP-to-TRP interference, set 2 is applied regardless of UE-to-UE interference as follows.

If the UE performs the transmission through the PUCCH with the UCI, if there is a potential TRP-to-TRP interference, the set 2 is applied regardless of the UE-to-UE interference as follows.

는 channel quality information을 위한 정보 bit 수를 나타내고,

는 HARQ-ACK 비트 수를 나타내고

는 scheduling request 여부 (0/1)를 나타낸다. here

Represents the number of information bits for channel quality information,

Indicates the number of HARQ-ACK bits

(0/1) indicating the scheduling request.

In this case, PDSCH applies the following power control. When it is determined that there is no UE-to-UE interference, the following equation is applied

If there is UE-to-UE interference, the following formula applies.

10 is a diagram showing an example of an interference situation caused by dynamic TDD application. Cross-link interference (inter-base station interference or inter-terminal interference) does not occur when the transmission direction is the same as in Fig. 10 (a). However, cross-link interference may occur when two base stations have different transmission directions as shown in FIGS. 10 (b) and 10 (c). Such cross-link interference varies in severity depending on the deployment of the base station and the location of the terminal. Therefore, different transmission power control strategies are needed depending on each situation. That is, as shown in FIG. 10 (a), when a transmission power control parameter set used in a situation where there is no cross-link interference and a situation in which inter-base station interference dominates or inter- As shown in FIG. 10 (c), the transmission power control parameter set used when the inter-base-station interference and the inter-terminal interference are both severe is different. In the TDD described above, the transmission power control scheme defines three transmission power control parameter sets as shown below, and different transmission power control parameter sets are applied considering interference conditions.

- Case 1: Fixed slot / subframe (or same transmission direction)

. Using transmit power control parameter set similar to LTE power control (rel.

. Transmission power control parameter set1

- Case 2: Flexible slot / subframe (or different transmission direction) without UE-to-UE interference

. Using transmit power control parameter set higher than Set 1

. Transmission power control parameter set2

- Case 3: Flexible slot / subframe (or different transmission direction) with UE-to-UE interference

. Using transmit power control parameter set lower than Set 1

. Transmission power control parameter set3

Case 2 and 3 can be combined with the sensing-based interference management technique, which is one of the cross-link interference control techniques. For example, after sensing the reference signal (RS) of a potential victim UE (interfering UE), if the strength of the sensing RS signal is greater than a certain threshold, the transmission power control parameter set 3 is applied, Otherwise (if less than a certain threshold) the transmit power control parameter set2 is applied. In case 3 using the transmission power control parameter set 3, the UE can operate in two major directions. The first is to perform UL transmission using the MCS level allocated from the base station. In this case, when the base station determines the MCS level, if the interference of the UL user of the neighbor base station is considered, if the neighbor base station is actually changed to the DL, the interference of the UL user of the adjacent cell may be reduced and relatively large inter- base station interference may occur. The interference cancellation / suppression technique is applied to inter-base-station interference with a relatively large signal intensity difference, so that the UL terminal signal transmitted at low transmission power can be detected at the base station. Second, link adaptation is performed so that the transmission power is lowered considering the inter-terminal interference first and detection is possible in the base station. When there is no inter-base station interference, a signal transmitted at a low MCS level with low transmission power can be detected using the changed MCS level information or blindly estimated information about the MCS level. In the presence of inter-base station interference, although the SINR is lower because the transmission power of the UL is lowered, interference cancellation / suppression technique is used when the interference between the desired signal and the base station is large, the desired signal can be detected.

There are three main ways to operate UL link adaptation. The first alternative is to notify multiple MCS candidates when the BS grants to the UL UE, and the UE selects one of the candidate MCSs and transmits the selected MCS candidate. The first option may have two options again. The first option is to perform blind detection based on the candidate information informed to the terminal to detect the signal transmitted by the terminal. The second option is to send the applied MCS information among the candidates received from the base station to the PUCCH or PUSCH / specific promised area, and the base station firstly detects this information and performs UL data detection based on this information.

FIGS. 11A, 11B, 12A and 12B show operation procedures of the terminal and the base station for the first option (Alt.1-1) and the second option (Alt.1-2) of the first alternative. In step 1 - 1, the UE first receives multiple MCS information from the BS, and the UE performs encoding on multiple MCS levels. Sensing determines the potential interference to neighboring terminals and determines the transmission MCS level based on the estimated interference. Then, UL data is transmitted using the determined MCS level. The base station first transmits multiple MCS level information to the mobile station, receives the transmitted data using the determined MCS, and performs blind detection using the candidate MCS level. In step 1, the UE first receives multiple MCS information from the base station, and the terminal performs encoding on multiple MCS levels. Sensing determines the potential interference to neighboring terminals and determines the transmission MCS level based on the estimated interference. Then, the application MCS information is transmitted together with the UL data by using the determined MCS level. The base station first transmits multiple MCS level information to the UE, decodes the MCS information applied by the UE, and decodes the UL data transmitted by the UE using the decoded MCS level.

And the second is a method in which the UE selects an MCS level lower than the MCS level allocated from the base station and transmits the selected MCS level. In this case, the base station performs blind detection to find the MCS level transmitted by the UE and performs detection on the UL data transmitted by the UE. Compared to the previous method, blind detection process can be complicated. The second option may have two options again. The first option is to perform blind detection based on the candidate information informed to the terminal to detect the signal transmitted by the terminal. The second option is to send the applied MCS information among the candidates received from the base station to the PUCCH or PUSCH / specific promised area, and the base station firstly detects this information and performs UL data detection based on this information.

13A, 13B, 14A, and 14B show operation procedures of the UE and the BS for the first option (Alt.2-1) and the second option (Alt.2-2) of the second alternative. In step 2-1, the UE first receives the single MCS information from the base station and performs encoding with the MCS level received from the base station and the MCS level lower than the received MCS level. Where x is an integer greater than or equal to zero. Sensing determines the potential interference to neighboring terminals and determines the transmission MCS level based on the estimated interference. Then, UL data is transmitted using the determined MCS level. The base station first transmits multiple MCS level information to the mobile station, receives data transmitted using the determined MCS, and performs blind detection using a single MCS transmitted to the mobile station and an MCS level having a code rate lower than that of the corresponding MCS. In step 2-2, the terminal first receives multiple MCS information from the base station, and encodes the MCS level received from the base station and x MCS levels lower than the received MCS level. Sensing determines the potential interference to neighboring terminals and determines the transmission MCS level based on the estimated interference. Then, the application MCS information is transmitted together with the UL data by using the determined MCS level. The base station first transmits multiple MCS level information to the UE and receives data transmitted using the MCS determined by the UE. At this time, the BS decodes the MCS information applied by the UE and performs UL data decoding using the decoded MCS information. If the BS has allocated the MCS level with the lowest code rate that can be supported by the standard, UL data will not be transmitted if the power of the neighboring UE should be further reduced due to the interference problem of the adjacent UE.

 The third assigns multiple TBs (or multiple CB-groups) to the UL UE and lowers the transmission power according to the UE-to-UE interference and sends it to some RBs that have allocated some TBs or CB-groups. The UE lowers the total UL power and transmits only some TBs (or some CB-groups) to the base station through some resources (RB), and the base station uses TRP-to-TRP interference cancellation when there is TRP-to- (TRP-to-TRP) interference cancellation if no TRP-to-TRP interference is present. Alternatively, the UE lowers the total UL power and increases the UL power per tone, so that only some TBs (or some CB-groups) are transmitted to the base station through some resource (RB), and the base station transmits the base station (using TRP-to-TRP interference cancellation) (Or CB-group) transmitted by the base station. In this case, power per tone can be set 1 or set 2.

 In addition, different transmission power control strategies can be applied depending on interference between base stations. That is, the UE can more efficiently control the transmission power by informing the UE whether the interference between the BSs is possible. To do this, we introduce a 'Potential TRP-to-TRP interference indication'. The 'Potential TRP-to-TRP interference indication' can be transmitted to the terminal using the RRC message and the 'Potential TRP-to-TRP interference indication' Together they can be passed to the DCI. The terminal determines and applies the transmit power parameter set according to whether the 'Potential TRP-to-TRP interference indication' is 0 or 1.

The open loop transmission power parameter set used when operating the transmission power control using different transmission power parameter sets according to the interference environment can be configured in various ways.

만 서로 다르게 구성하는 것이다. As a first example, the UE-specific value

Are different from each other.

Here, UL-UL means interference by UL UEs of a neighbor base station, DL-UL means interference between base stations, and UL-DL means inter-terminal interference.

만 서로 다르게 구성하는 것이다. The second example is a value to compensate for path-loss as the following equation

Are different from each other.

와 경로손실 (path-loss)을 보상하기 위한 값인

를 모두 서로 다르게 구성하는 것이다. The third example is the UE-specific value

And a path loss (path loss)

Are different from each other.

에 관한 3개의 power control parameter sets을 cell-specific RRC signaling (SIB)를 이용해 단말로 전송하고 UE specific parameter인 P_{O_ UE _ PUSCH} 와 P_{O_ UE _ PUCCH} 에 관한 3개의 power control parameter sets을 UE-specific RRC signaling을 통해 단말로 전송한다. 그리고 나서 TPC Command (MAC CE 또는 DCI TPC field) 및 DCI에 (Potential) TRP-to-TRP interference indication를 단말로 전송한다. 15 is a diagram illustrating an operation procedure of a base station for a power control scheme considering UE-to-UE interference and a base station capability. First, the base station is P _{O_NORMAL_} P _PUSCH and _{PUCCH O_NORMAL_} cell specific parameter, and

(RRC) signaling (SIB) to the UE, and three power control parameter sets for the UE specific parameters P _{O_ UE _ PUSCH} and P _{O_ UE _ PUCCH} are UE-specific RRC signaling. And then transmits a (Potential) TRP-to-TRP interference indication to the TPC Command (MAC CE or DCI TPC field) and DCI.

16 is a diagram illustrating an operation procedure of a UE for a power control scheme considering UE-to-UE interference and a base station capability. First, the MS receives power control parameter sets and TRP-to-TRP indicator information. It then determines if the TRP-to-TRP indicator is 1. If the TRP-to-TRP indicator is not 1, the estimated potential UE-to-UE Interference is compared with a specific threshold. If the TRP-to-TRP indicator is greater than a threshold, the power control parameter set 3 is used. data is transmitted. If the TRP-to-TRP indicator is 1, the estimated potential UE-to-UE interference is compared with a specific threshold. If the threshold is greater than a threshold, power control parameter set 3 is used. If the TRP- data is transmitted.

FIG. 17 is a diagram illustrating another embodiment of an operation procedure of a UE for a power control scheme considering UE-to-UE interference and a base station capability. First, the UE receives power control parameter set information and determines whether UE-to-UE Interference is> threshold A or not. If the UE-to-UE Interference threshold is satisfied, UL transmission is performed using the power control parameter set 3. If UE-to-UE Interference> threshold A is not satisfied, UE-to-UE Interference <threshold B is determined. If the UE-to-UE Interference <threshold B is satisfied, the power control parameter set 2 is used. Otherwise, the UL is performed using the power control parameter set 1. In this case, the UL transmission power may be determined using Equation (11) using set2 and set1 instead of the power control parameter set1.

18 is a diagram illustrating a structure of a terminal according to an embodiment of the present invention.

18, the terminal may include a transmission / reception unit 1810, a control unit 1820, and a storage unit 1830. In the present invention, the control unit may be defined as a circuit or an application specific integrated circuit or at least one processor.

The transceiver 1810 can transmit and receive signals with other network entities. The transceiver 1810 can receive system information from, for example, a base station and can receive a synchronization signal or a reference signal.

The controller 1820 can control the overall operation of the terminal according to the embodiment of the present invention. For example, the controller 1820 may control the signal flow between each block to perform the operation according to the flowcharts described above. In detail, the controller 1820 can control the operation proposed by the present invention for transmission power control in the dynamic TDD system according to the embodiment of the present invention.

The storage unit 1830 may store at least one of information transmitted and received through the transceiver 1810 and information generated through the controller 1820.

19 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.

19, the base station may include a transmission / reception unit 1910, a control unit 1920, and a storage unit 1930. In the present invention, the control unit may be defined as a circuit or an application specific integrated circuit or at least one processor.

The transceiver 1910 can transmit and receive signals with other network entities. The transmission / reception unit 1910 can transmit system information to the terminal, for example, and can transmit a synchronization signal or a reference signal.

The controller 1920 can control the overall operation of the base station according to the embodiment of the present invention. For example, the controller 1920 may control the signal flow between each block to perform an operation according to the flowcharts described above. In detail, the controller 1920 can control the operation proposed in the present invention for transmission power control in the dynamic TDD system according to the embodiment of the present invention.

The storage unit 1930 may store at least one of information transmitted / received through the transmission / reception unit 1910 and information generated through the control unit 1920.

Claims (1)

A method for processing a control signal in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting the second control signal generated based on the process to the base station.

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