KR20180136328A - Method and apparatus for hybrid cross-link interference mitigation - Google Patents

Abstract

The present invention relates to a communication technique fusing a fifth generation (5G) communication system with IoT technology to support higher data rates than a fourth generation (4G) system and a system thereof. The present invention may be applied to intelligent services (for example, a smart home, smart building, smart city, smart car of connected car, health care, digital education, retail, security and safety related services) based on 5G communication technology and IoT related technology. According to the present invention, disclosed is a method for effectively controlling interference in an environment where dynamic TDD is applied and an apparatus thereof. The method comprises the steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the process to the base station.

Description

[0001] METHOD AND APPARATUS FOR HYBRID CROSS-LINK INTERFERENCE MITIGATION FOR DYNAMIC TDD SYSTEM [0002]

The present invention relates to a wireless communication system, and more particularly, to a wireless communication system in which a hybrid (proactive and reactive) communication system for solving a DL-to-UL interference problem caused by applying a dynamic TDD (Time Division Duplex) Coupled) interference management method and apparatus.

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.

Meanwhile, research on applying a dynamic TDD (dynamic TDD) scheme according to the recent development of a communication system has been actively carried out. Accordingly, there is a demand for a solution to the interference problem between the base stations Is increasing day by day.

It is an object of the present invention to provide an interference management method for controlling cross-link interference that may occur when each base station in a clustering or communication network independently performs a dynamic TDD in which UL / .

Yet another object of the present invention is to propose an interference management method for more efficiently and effectively controlling an interference environment that changes much more dynamically due to UL / DL transmission direction change in slot unit, unlike the existing technique.

Yet another object of the present invention is to propose a method for enhancing resource efficiency by differently applying the interference management mode according to the interference environment. In addition, we propose a short-term and long-term UE-to-UE interference measurement method and procedure for obtaining short-term and long-term UE-to-UE interference information necessary for applying interference management techniques.

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, cross-link interference caused by Dynamic TDD can be efficiently managed.

According to another embodiment of the present invention, the increase in spectral efficiency due to the dynamic TDD can be ensured by solving the interference problem between the terminal and the base station.

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

According to another embodiment of the present invention, it is possible to effectively apply various interference management techniques by suggesting a short-term and long-term UE-to-UE interference measurement method.

1 is a diagram illustrating an embodiment of a hybrid cross-link interference management technique.
2 is a diagram illustrating a frame structure and a cross-link interference concept diagram for the sensing mode and the normal mode.
3 is a diagram illustrating an example of cell deployment for explaining the concept of mode selection based on cell deployment information.
4 is a diagram illustrating an embodiment of mode selection based on a support service and cell deployment type.
5 is a conceptual diagram of a cluster for explaining a transmission direction information-based mode selection method of an adjacent base station.
6 is a diagram illustrating an embodiment of a transmission direction information-based mode selection scheme of a supporting service and an adjacent base station.
7 is a diagram illustrating an embodiment of a support service, a cell deployment type, and a mode selection scheme based on a transmission direction information of an adjacent base station.
8 is a diagram illustrating an embodiment of a UE-to-UE interference measurement scheme.
9 is a diagram illustrating an embodiment of a UE-to-UE interference measurement procedure.
10 is a diagram showing a frame structure for SRS-based short-term UE-to-UE interference measurement.
11 is a diagram illustrating an embodiment of an SRS-based short-term UE-to-UE interference measurement scheme.
12 is a diagram illustrating an embodiment of a short-term UE-to-UE interference measurement procedure for distinguishing UEs using only a UE specific cyclic shift value.
FIG. 13 is a diagram illustrating an embodiment of a short-term UE-to-UE interference measurement scheme for distinguishing UEs using only IFDMA and UE specific cyclic shift values.
14 is a diagram showing a frame structure for long-term UE-to-UE interference measurement using SRS.
15 is a diagram illustrating an embodiment of a long-term UE-to-UE interference measurement scheme using SRS.
16 is a diagram illustrating an embodiment of a long-term UE-to-UE interference measurement scheme using SRS.
17 is a diagram showing an embodiment of a long-term UE-to-UE interference measurement scheme using SRS.
18 is a diagram illustrating an embodiment of a mode selection based cross-link interference management scheme.
19 is a diagram illustrating an embodiment of a mode selection based cross-link interference management scheme.
20 is a diagram illustrating a base station apparatus according to embodiments of the present invention.
21 is a diagram illustrating a terminal device according to embodiments 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 We propose a method to improve the resource efficiency by applying different interference management mode according to the interference environment. In addition, we propose a short-term and long-term UE-to-UE interference measurement method and procedure for obtaining short-term and long-term UE-to-UE interference information necessary for applying interference management techniques.

There are limitations on interference control in real time by proactive methods such as sensing / power control / coordination based interference management, and reactive measures such as interference suppression / cancellation have limitations in the number of suppression / cancellation interference. Considering these points, proactive interference management scheme and reactive interference management scheme should be used together to manage cross-link interference in dynamic TDD. For example, consider a proactive approach such as sensing / power control / coordination based interference management to limit the number of cross-link interference and remove the remaining cross-link interference with a reactive approach such as interference suppression / cancellation. In a deployment environment with low intercell interference such that interference can be managed only by interference suppression / cancellation, inter-cell interference (interference cancellation) is more likely than interference cancellation without applying proactive measures such as sensing / power control / (TRP-to-TRP / UE-to-UE) deployments can be used to limit the number of interferences by applying proactive measures such as sensing / power control / coordination based interference management.

1 is a diagram illustrating an embodiment of a hybrid cross-link interference management technique. First, the state of cell deployment is grasped through coordination between gNBs and shared state. If information about allocated resources or interference resources is shared through gNB coordination, interference can be avoided through UL UE scheduling. Also exchange information about UL / DL transmission direction between gNBs. The UL UE can directly or indirectly measure the UE-to-UE interference to determine whether to transmit and adjust the transmission power according to the measured interference level, thereby reducing the number of interference to be suppressed / removed in the adjacent DL UE. In addition, the DL base station avoids interference through DL UE scheduling, thereby reducing the number of interference that should be suppressed / removed at the neighboring base station.

The LBT must be performed in the unlicensed band, but in the license band it can be determined whether to perform it if necessary. Performing LBT (listen before talk) every time, whether it is needed or not, wastes resources. Therefore, instead of performing the LBT every time, it is possible to determine whether to perform the LBT based on the support service (eMBB vs. URLLC service) information, the cell-deployment information, and the transmission direction of the neighbor base station. This process is called mode selection. For example, if the base station determines that a proactive scheme (sensing based scheme) is not needed, set it to no sensing mode (normal mode), and if the base station determines that a proactive scheme (sensing based scheme) is needed, set it to sensing mode. Mode information is transmitted to the UE using a mode indicator when transmitting an UL grant. That is, the 1-bit indicator is used to indicate the no sensing mode (0) or the sensing mode (1) as the DCI information.

2 is a diagram illustrating a frame structure and a cross-link interference concept diagram for the sensing mode and the normal mode. In the sensing mode, some of the UL / DL resources must be allocated as the sensing period, which may lead to waste of resources.

2, when the UL transmission data of the UE 1 corresponds to the URLLC service (low latency service), it is determined that normal mode transmission is necessary, and an indication is transmitted from the BS to the UE to transmit in the normal mode do. That is, the UL terminal transmits UL data through the UL grant resource without sensing. If the UL transmission data of the UE 1 corresponds to the eMBB service (a service whose latency is relatively insignificant), the BS determines that sensing mode transmission is necessary and performs an indication to the UE to transmit the sensing mode. After sensing the data / RS transmitted by the potential victim terminal of the neighboring base station, the UL terminal transmits UL data through the remaining UL grant resource if interference lower than a certain threshold is expected. If interference higher than a certain threshold is expected, The UE transmits the UL data through the remaining UL grant resource or delays the transmission.

3 is a view showing an embodiment of cell deployment for explaining concept of cell selection based on cell deployment information. When the mode is selected as the cell deployment information base (isolated cell / isolated cell group vs. connected cell), when the UE accesses the isolated cell or the isolated cell group, the base station grasps the cell deployment status to transmit in the normal mode, indication. That is, the base station belonging to the isolated cell / isolated cell group transmits an indication corresponding to the normal mode to the mobile station, and the base station belonging to the connected cell transmits an indication corresponding to the sensing mode to the mobile station. The UE detects the UL transmission mode indicator, and if the normal mode is received, the UE transmits UL data through the UL grant resource immediately without sensing. If the sensing mode is received, the potential victim UE transmits data / RS If the interference is expected to be lower than a certain threshold, UL data is transmitted through the remaining UL grant resources. If interference higher than a certain threshold is expected, UL data is transmitted or transmitted through the remaining UL grant resources with low transmission power. To the next.

4 is a diagram illustrating an embodiment of mode selection based on a support service and cell deployment type. First, the cell deployment status is determined by long-term TRP-to-TRP interference / UE-to-UE interference measurement of the base station, and then it is determined whether the cell is an isolated cell / isolated group cell. And if it is not an isolated cell / isolated group cell, the UL UE determines whether the desired service is a service requiring low latency such as URLLC. When the UL UE requests low latency, the BS transmits a sensing mode indicator to the UE, and if the UL UE does not request low latency, the BS transmits a normal mode indicator to the UE.

5 is a conceptual diagram of a cluster for explaining a transmission direction information-based mode selection method of an adjacent base station. The procedure for performing mode selection based on the transmission direction information of the neighbor base station is as follows. First, clustering is performed based on long-term cross-link interference information between cells, and then UL / DL information is collected for the cells in the cluster. If the transmission direction of the corresponding cell is the majority, it performs normal transmission. If it is minority, it decreases the transmission power, decreases the cell radius, or decreases the cell radius. And then transmits it. The UE, which is difficult to transmit due to the reduction of the cell radius, performs transmission in the slot / TTI / subframe in which the corresponding cell is a majority cell.

6 is a diagram illustrating an embodiment of a transmission direction information-based mode selection scheme of a supporting service and an adjacent base station. First, each base station collects the transmission direction information of the neighboring cell and determines whether the transmission direction of the corresponding cell is majority (multiple cells) or minority (small number of cells). If the transmission direction of the corresponding cell is majority, cell, the UL UE determines whether the desired service is a service requiring low latency such as URLLC. When the UL UE requests low latency, the BS transmits a sensing mode indicator to the UE, and if the UL UE does not request low latency, the BS transmits a normal mode indicator to the UE.

7 is a diagram illustrating an embodiment of a support service, a cell deployment type, and a mode selection scheme based on a transmission direction information of an adjacent base station. First, the transmission direction information of neighboring cells is collected and the cell deployment status is determined. It is determined whether the corresponding cell is an isolated cell / isolated group cell based on the cell deployment status obtained through long-term TRP-to-TRP interference / UE-to-UE interference measurement of each base station. mode indicator to the UE and if it is not an isolated cell / isolated group cell, each base station determines whether the transmission direction of the corresponding cell is a majority (multiple cells) or minority (a small number of cells) based on the collected transmission direction information of the adjacent cells, If the transmission direction of the corresponding cell is majority, normal transmission is performed. If the cell is a minority cell, the UL UE determines whether the desired service is a service requiring low latency such as URLLC. When the UL UE requests low latency, the BS transmits a sensing mode indicator to the UE, and if the UL UE does not request low latency, the BS transmits a normal mode indicator to the UE.

Figure 8 shows an embodiment of a UE-to-UE interference measurement scheme. FIG. 8A shows a first alternative in which a UL terminal performs a potential power level detection for a DL of a neighboring base station through sensing before performing UL, and indirectly estimates interference between neighboring terminals using the power detection value do. In this case, it is difficult to distinguish between DL / UL signals, which may cause transmission power to be lowered or delayed more than necessary. FIG. 8B shows a slot (frame) structure for performing a UE-to-UE interference measurement using a sensing RS, while a potential interfering UE transmits a sensing RS to a potential interfered UE as a second alternative. In this case, it is possible to distinguish the DL / UL signal by giving identification information to the sensing RS, which enables more accurate UE-to-UE interference measurement. FIG. 8 (c) is a third alternative for UE-to-UE interference measurement, in which there is no change in the operation of the potential interfered UE. 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. In order to estimate the CLI interference based on the reference signal as in the second and third alternative, the configuration information of the reference signal should be exchanged between the gNBs through backhaul signaling. The configuration information of the reference signal exchanged between the gNBs may include all or some of the allocated resource information, sequence related information, port number related information, and precoding related information of the DMRS when using the DMRS / CSI. The configuration information of the reference signal exchanged between the gNBs is SRS configuration parameter, SRS configuration parameter, cell-specific information, maximum SRS bandwidth and subframe sets, UE-specific information such as frequency-domain position, frequency hop size, / Periodic, periodicity and subframe offset, transmission comb offset, cyclic shift value, and the like.

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

10 is a diagram showing a frame structure for SRS-based short-term UE-to-UE interference measurement. When UL SRS is used as Sensing RS, a cell specific ZC sequence is allocated and each DL UE transmits through resources allocated to the sensing RS using different cyclic shifts, thereby making it possible to more accurately grasp the interference influence of each link . The DL gNB configures cell specific ZC sequences and UE specific cyclic shift values for each UE. UEs may be distinguished using interleaved FDMA (IFDMA) in addition to UE specific cyclic shift values. The cell specific ZC sequence can use the sequence-group number and the base sequence number used in generating the SRS ZC sequence allocated for the CQI. The UE specific cyclic shift value can be transmitted to the UE in the following manner. The first scheme is to transmit the UE specific cyclic shift value to the UE through the DCI. The second option is to transmit via RRC signaling. In this case, the cyclic shift value for the periodic SRS or the cyclic shift value for the aperiodic SRS used for the CQI can be reused, but a new value can be allocated to avoid the same cyclic shift value between the UEs. In the latter case, the cyclic shift value for the UE-to-UE interference measurement is given as RRC, and it can be informed through DCI whether this value is used or not. In this case, a UE that does not receive a cyclic shift value for UE-to-UE interference measurement through DCI transmits SRS for UE-to-UE interference measurement using a cyclic shift value for SRS used for CQI. The third scheme implicitly assigns UE specific cyclic shift values using allocated DL resources and mapping relationships. For example, the total resources are divided into 8 sub-bands and the SRS is transmitted using a cyclic shift value corresponding to each sub-band resource. Unlike existing SRS, SRS for UE-to-UE interference measurement only needs to transmit DL scheduled UE. Since the SRS that can multiplex on a specific resource is limited, different frequency resources can be allocated to each cell to increase the number of UEs that can be distinguished.

11 is a diagram illustrating an embodiment of an SRS-based short-term UE-to-UE interference measurement scheme. The UE allocates orthogonal frequency resources for transmitting SRS for short-term UE-to-UE interference measurement for each cell, and the UE of each cell allocates a UE-specific cyclic shift version of the cell-specific ZC sequence Lt; / RTI > UL UE measuring UE-to-UE interference is capable of identification of a cell to be interfered with according to a frequency resource. By using the UE-specific cyclic shift, it is possible to prevent excessive detection of interference intensity by preventing detection by combining user power.

FIG. 12 is a diagram illustrating an embodiment of a short-term UE-to-UE interference measurement procedure for distinguishing UEs using only a UE-specific cyclic shift value. First, coordination is performed with respect to frequency resources for transmitting SRSs between the base stations. The base station supporting the UL UE transmits a sub-band-specific cell-specific RS sequence generation parameter to the UL UE. The base station supporting the DL UE transmits a cell-specific RS sequence generation parameter to the DL UE, Assign a value. Then, the DL UE generates a cell-specific RS sequence using the SRS resource indicated by the base station, performs UE-specific cyclic shift, and transmits SRS for UE-to-UE interference measurement. The UL UE generates a cell-specific RS sequence for each subband and detects the SRS transmitted from the neighboring cell UE to measure potential UE-to-UE interference.

FIG. 13 is a diagram illustrating an embodiment of a short-term UE-to-UE interference measurement scheme for distinguishing UEs using IFDMA and UE-specific cyclic shift values. First, coordination is performed with respect to frequency resources for transmitting SRSs between the base stations. The base station supporting the UL UE transmits the cell-specific RS sequence generation parameter to the UL UE, whether it is IFDMA or sub-band. The base station supporting the DL UE transmits a cell specific RS sequence generation parameter to the DL UE, Assign a shift value. Then, the DL UE generates a cell-specific RS sequence using the SRS resource indicated by the base station, performs UE-specific cyclic shift, and transmits SRS for UE-to-UE interference measurement. The UL UE generates a cell-specific RS sequence for each subband and detects the SRS transmitted from the neighboring cell UE to measure potential UE-to-UE interference.

FIG. 14 is a diagram illustrating a frame structure for long-term UE-to-UE interference measurement using SRS. In order to measure long-term UE-to-UE interference, SRS for existing CQI can be used because SRS does not need to come before slot / subframe / TTI. UE-to-UE interference can be measured using a mini-slot.

15 is a diagram showing an embodiment of a long-term UE-to-UE interference measurement scheme using SRS. First, uplink SRS configuration parameter information between base stations is shared. The SRS configuration parameters include cell-specific information, maximum SRS bandwidth and subframe sets, UE-specific information such as frequency-domain position, frequency hop size, single SRS / Periodic, periodicity and subframe offset, transmission comb offset, Or all of them. The base station supporting the UL UE calculates the SRS transmission resources (time / frequency) of neighboring cell UEs, and transmits to the UL UE an indicator for triggering UE-to-UE interference measurement through the DCI and SRS sequence generation parameter and measurement resource information . The base station supporting the DL UE transmits the SRS configuration parameter information to the DL UE. The DL UE generates the SRS using this information and transmits the SRS through the allocated resources. At this time, the UL UE measures the potential UE-to-UE interference using the SRS transmitted from the neighboring cell UE and feeds the measured interference information to the serving base station.

16 is a diagram illustrating an embodiment of a long-term UE-to-UE interference measurement scheme using SRS. First, the base station exchanges uplink SRS configuration parameter information. The base station supporting the UL UE calculates an SRS transmission resource (time / frequency) of neighbor cell UEs, and provides an indicator to the UL UE for UE-to-UE interference measurement triggering through DCI, neighbor cell ID, . UE-to-UE interference can be measured by generating an RS sequence using neighbor cell ID, group hopping, and measurement resource information, and detecting a plurality of cyclic shift values or IFDMA blind by using the RS sequence. The base station supporting the DL UE transmits the SRS configuration parameter information to the DL UE. The DL UE generates the SRS using this information and transmits the SRS through the allocated resources. At this time, the UL UE measures the potential UE-to-UE interference using the SRS transmitted from the neighboring cell UE and feedbacks the measured interference information to the serving base station.

17 is a diagram illustrating an embodiment of a long-term UE-to-UE interference measurement scheme using SRS. First, the base station exchanges uplink SRS configuration parameter information. The base station supporting the UL UE calculates the SRS transmission resources (time / frequency) of the neighboring cell UEs, and transmits an indicator and measurement resource information to the UL UE for triggering UE-to-UE interference measurement through the DCI. The base station supporting the DL UE transmits the SRS configuration parameter information to the DL UE. The DL UE generates the SRS using this information and transmits the SRS through the allocated resources. At this time, the UL UE measures the potential UE-to-UE interference using the SRS transmitted from the neighboring cell UE and feedbacks the measured interference information to the serving base station. When the UE-to-UE interference measurement is triggered through the DCI, the UE-to-UE interference measurement is performed through signal power detection of the allocated measurement resources. This scheme can minimize the amount of signaling, but can result in a false alarm (determined by the signal of the adjacent UL UE in the DL signal of another neighboring cell).

18 is a diagram illustrating an embodiment of a mode selection based cross-link interference management scheme. First, it is determined whether UE-to-UE interference is managed based on long-term UE-to-UE measurement. If it is determined that interference management is required through the LBT scheme, the base station transmits "Sensing mode = 1" And determines whether the UL terminal should transmit after sensing short-term UE-to-UE interference. If it is determined that interference management is not required through the LBT scheme, the base station transmits "Sensing mode = 0" The UL terminal performs UL transmission without short-term UE-to-UE interference sensing.

19 is a diagram illustrating an embodiment of a mode selection based cross-link interference management scheme. First, it is determined whether UE-to-UE interference is managed based on long-term UE-to-UE measurement. If it is determined that interference management is required through the LBT scheme, the base station transmits "Sensing mode = 1" And the UL terminal determines transmission power control parameters based on information obtained through short-term UE-to-UE interference sensing and performs UL transmission using the determined transmission power control parameters. If it is not necessary, the base station transmits "Sensing mode = 0" to the UL terminal and the UL terminal performs UL transmission without short-term UE-to-UE interference sensing.

20 is a diagram illustrating a structure of a UE according to an embodiment of the present invention.

Referring to FIG. 20, the terminal may include a transmission / reception unit, a control unit, and a storage unit. 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 can send and receive signals with other network entities. The transceiver may receive system information from, for example, a base station and may receive a synchronization signal or a reference signal.

The controller may control the overall operation of the terminal according to the embodiment of the present invention. For example, the control unit may control the signal flow between each block to perform the operations according to the above-described drawings and flowcharts. Specifically, the control unit operates according to a control signal from the base station and can exchange messages or signals with the base station and / or the base station.

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

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

Referring to FIG. 21, the base station may include a transmission / reception unit, a control unit, and a storage unit. 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 can send and receive signals with other network entities. The transmitting and receiving unit can transmit system information to the terminal, for example, and can transmit a synchronous signal or a reference signal.

The controller can control the overall operation of the base station according to the embodiment of the present invention. For example, the controller may control operations proposed in the present invention to manage and reduce interference with neighboring base stations.

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

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Accordingly, the scope of the present invention should be construed as being included in the scope of the present invention, all changes or modifications derived from the technical idea of the present invention.

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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