WO2013025051A2 - 전송 포인트 그룹에 대한 셀간 간섭 조정 방법 및 장치 - Google Patents
전송 포인트 그룹에 대한 셀간 간섭 조정 방법 및 장치 Download PDFInfo
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- WO2013025051A2 WO2013025051A2 PCT/KR2012/006499 KR2012006499W WO2013025051A2 WO 2013025051 A2 WO2013025051 A2 WO 2013025051A2 KR 2012006499 W KR2012006499 W KR 2012006499W WO 2013025051 A2 WO2013025051 A2 WO 2013025051A2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0073—Allocation arrangements that take into account other cell interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0056—Inter-base station aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2211/00—Orthogonal indexing scheme relating to orthogonal multiplex systems
- H04J2211/001—Orthogonal indexing scheme relating to orthogonal multiplex systems using small cells within macro cells, e.g. femto, pico or microcells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
- H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
Definitions
- the following description relates to a wireless communication system, and more particularly, to an inter-cell interference coordination method and apparatus for a transmission point group.
- heterogeneous network refers to a network in which the macro base station 110 and the micro base stations 121 and 122 coexist even though the same Radio Access Technology (RAT) is used.
- RAT Radio Access Technology
- the macro base station 110 has a wide coverage and high transmit power, and means a general base station of a wireless communication system.
- the macro base station 110 may be referred to as a macro cell.
- the micro base stations 121 and 122 may be referred to, for example, as micro cells, pico cells, femto cells, home eNBs (HeNBs), relays, and the like. It may be.
- the micro base stations 121 and 122 are small versions of the macro base station 110 and may operate independently while performing most of the functions of the macro base station, and may be installed in an area covered by the macro base station or not covered by the macro base station. A base station of the non-overlay type.
- the micro base stations 121 and 122 may accommodate fewer terminals with narrower coverage and lower transmission power than the macro base station 110.
- the terminal 131 may be directly served by the macro base station 110 (hereinafter referred to as a macro-terminal), and the terminal 132 may be served by the micro base station 122 (hereinafter referred to as a micro-terminal). In some cases, the terminal 132 existing within the coverage of the micro base station 122 may be served from the macro base station 110.
- interference may occur in the downlink signal from the macro base station received by the macro terminal due to the strong downlink signal from the micro base station.
- the terminal served by the micro base station may receive strong interference due to the downlink signal of the macro base station.
- the neighboring cell mitigates / removes interference by limiting its transmission in some resource regions (eg, some subframes and / or some frequency bands).
- Inter-Cell Interference Coordination may be performed.
- TPs transmission points
- CoMP Coordinated Multi-Point
- the set of transmission points performing the CoMP operation may be expressed as a CoMP cluster (or a cooperative communication cluster).
- ICIC in a wireless communication system in which a CoMP cluster is configured needs to consider both interference coordination between CoMP clusters and interference coordination in terms of transmission points within the cluster. Since the existing ICIC scheme is defined in terms of one transmission point, CoMP clusters are not suitable as an interference coordination scheme.
- a transmission point group for example, a CoMP cluster
- a method for performing interference coordination in a wireless communication system includes exchanging an interference coordination message between transmission point groups, and one transmission point group includes a plurality of transmission point groups.
- the interference coordination message may include interference coordination information for individual transmission point units in the one transmission point group, and interference coordination information for all transmission point units in the one transmission point group. Can be.
- an apparatus for performing interference coordination in a wireless communication system includes a transmission module for transmitting an interference coordination message to another transmission point group; A receiving module for receiving an interference coordination message from the other transmission point group; And a processor configured to control the exchange of interference coordination messages between the transmitting module and the transmitting point group via the receiving module;
- One transmission point group includes a plurality of transmission points, and the interference coordination message includes interference coordination information for individual transmission point units in the one transmission point group and all transmission point units in the one transmission point group. It may include interference coordination information for.
- the interference coordination message may further include identification information for the individual transmission point.
- the identification information may include one of an identifier of the transmission point, an antenna port index of a reference signal, or a configuration index of channel state information-reference signal.
- the transmission points in the one transmission point group may have the same cell identifier.
- the interference coordination message may include information on a total of transmission powers of a plurality of transmission points in the one transmission point group.
- the total transmission power may be determined based on weights for the plurality of transmission points.
- the weight may be determined based on a distance between each of the plurality of transmission points in the one transmission point group and another transmission point group.
- allocation of transmission powers for the plurality of transmission points may be adjusted while maintaining the total transmission power.
- Cooperative communication of a plurality of transmission points in the one transmission point group may be performed when the transmission rate achieved by the cooperative communication is large compared to the amount of interference caused by the cooperative communication.
- the interference adjustment message may include at least one of Almost Blank Subframe (ABS) configuration information, ABS status information, relative narrowband transmission power (RNTP) information, interference overhead indication (IOI) information, or high interference indication (HII) information. It may include.
- ABS Almost Blank Subframe
- RTP relative narrowband transmission power
- IOI interference overhead indication
- HAI high interference indication
- an interference coordination method and apparatus in a wireless communication system in which a transmission point group (for example, a CoMP cluster) is configured may be provided.
- FIG. 1 is a diagram illustrating a heterogeneous network wireless communication system 100 including a macro base station and a micro base station.
- FIG. 2 is a diagram illustrating a structure of a downlink radio frame.
- 3 is a diagram illustrating a resource grid in a downlink slot.
- FIG. 4 is a diagram illustrating a structure of a downlink subframe.
- 5 is a diagram illustrating a structure of an uplink subframe.
- FIG. 6 is a configuration diagram of a wireless communication system having multiple antennas.
- FIG. 7 is a diagram illustrating examples of a configuration of a CoMP cluster.
- FIG. 8 is a diagram illustrating an example of coordination between CoMP clusters.
- FIG. 9 is a diagram illustrating another example of coordination between CoMP clusters.
- FIG. 10 is a diagram illustrating a configuration of an apparatus for performing interference coordination according to the present invention.
- each component or feature may be considered to be optional unless otherwise stated.
- Each component or feature may be embodied in a form that is not combined with other components or features.
- some components and / or features may be combined to form an embodiment of the present invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.
- the base station has a meaning as a terminal node of the network that directly communicates with the terminal.
- the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.
- a 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point (AP), and the like.
- the repeater may be replaced by terms such as relay node (RN) and relay station (RS).
- the term “terminal” may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), a subscriber station (SS), and the like.
- Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-Advanced (LTE-A) system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
- LTE-A Advanced
- WiMAX can be described by the IEEE 802.16e standard (WirelessMAN-OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system). For clarity, the following description focuses on 3GPP LTE and 3GPP LTE-A systems, but the technical spirit of the present invention is not limited thereto.
- a structure of a downlink radio frame will be described with reference to FIG. 2.
- uplink / downlink data packet transmission is performed in units of subframes, and one subframe is defined as a predetermined time interval including a plurality of OFDM symbols.
- the 3GPP LTE standard supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).
- the downlink radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain.
- the time it takes for one subframe to be transmitted is called a transmission time interval (TTI).
- TTI transmission time interval
- one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
- One slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
- RBs resource blocks
- a resource block (RB) is a resource allocation unit and may include a plurality of consecutive subcarriers in one slot.
- the number of OFDM symbols included in one slot may vary depending on the configuration of a cyclic prefix (CP).
- CP has an extended CP (normal CP) and a normal CP (normal CP).
- normal CP normal CP
- the number of OFDM symbols included in one slot may be seven.
- the OFDM symbol is configured by an extended CP, since the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is smaller than that of the normal CP.
- the number of OFDM symbols included in one slot may be six.
- an extended CP may be used to further reduce intersymbol interference.
- one subframe includes 14 OFDM symbols.
- the first two or three OFDM symbols of each subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).
- PDCCH physical downlink control channel
- PDSCH physical downlink shared channel
- Type 2B is a diagram illustrating the structure of a type 2 radio frame.
- Type 2 radio frames consist of two half frames, each of which has five subframes, a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
- DwPTS downlink pilot time slot
- GP guard period
- UpPTS uplink pilot time slot
- One subframe consists of two slots.
- DwPTS is used for initial cell search, synchronization, or channel estimation at the terminal.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
- the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- one subframe consists of two slots regardless of the radio frame type.
- the structure of the radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of symbols included in the slot may be variously changed.
- One downlink slot includes seven OFDM symbols in the time domain and one resource block (RB) is shown to include 12 subcarriers in the frequency domain, but the present invention is not limited thereto.
- one slot includes 7 OFDM symbols in the case of a general cyclic prefix (CP), but one slot may include 6 OFDM symbols in the case of an extended-CP (CP).
- CP general cyclic prefix
- Each element on the resource grid is called a resource element.
- One resource block includes 12 ⁇ 7 resource elements.
- the number of N DLs of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.
- the structure of the uplink slot may be the same as the structure of the downlink slot.
- FIG. 4 is a diagram illustrating a structure of a downlink subframe.
- Up to three OFDM symbols at the front of the first slot in one subframe correspond to a control region to which a control channel is allocated.
- the remaining OFDM symbols correspond to data regions to which a physical downlink shared channel (PDSCH) is allocated.
- Downlink control channels used in the 3GPP LTE system include, for example, a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and a Physical HARQ Indicator Channel.
- PCFICH Physical Hybrid automatic repeat request Indicator Channel
- the PCFICH is transmitted in the first OFDM symbol of a subframe and includes information on the number of OFDM symbols used for control channel transmission in the subframe.
- the PHICH includes a HARQ ACK / NACK signal as a response of uplink transmission.
- Control information transmitted through the PDCCH is referred to as downlink control information (DCI).
- DCI includes uplink or downlink scheduling information or an uplink transmit power control command for a certain terminal group.
- the PDCCH is a resource allocation and transmission format of the downlink shared channel (DL-SCH), resource allocation information of the uplink shared channel (UL-SCH), paging information of the paging channel (PCH), system information on the DL-SCH, on the PDSCH Resource allocation of upper layer control messages such as random access responses transmitted to the network, a set of transmit power control commands for individual terminals in an arbitrary terminal group, transmission power control information, and activation of voice over IP (VoIP) And the like.
- a plurality of PDCCHs may be transmitted in the control region.
- the terminal may monitor the plurality of PDCCHs.
- the PDCCH is transmitted in an aggregation of one or more consecutive Control Channel Elements (CCEs).
- CCEs Control Channel Elements
- the CCE is a logical allocation unit used to provide a PDCCH at a coding rate based on the state of a radio channel.
- the CCE corresponds to a plurality of resource element groups.
- the format of the PDCCH and the number of available bits are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
- the base station determines the PDCCH format according to the DCI transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information.
- the CRC is masked with an identifier called a Radio Network Temporary Identifier (RNTI) according to the owner or purpose of the PDCCH.
- RNTI Radio Network Temporary Identifier
- the cell-RNTI (C-RNTI) identifier of the terminal may be masked to the CRC.
- a paging indicator identifier P-RNTI
- the PDCCH is for system information (more specifically, system information block (SIB))
- SI-RNTI system information RNTI
- RA-RNTI Random Access-RNTI
- RA-RNTI may be masked to the CRC to indicate a random access response that is a response to the transmission of the random access preamble of the terminal.
- the uplink subframe may be divided into a control region and a data region in the frequency domain.
- a physical uplink control channel (PUCCH) including uplink control information is allocated to the control region.
- a physical uplink shared channel (PUSCH) including user data is allocated.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- one UE does not simultaneously transmit a PUCCH and a PUSCH.
- PUCCH for one UE is allocated to an RB pair in a subframe. Resource blocks belonging to a resource block pair occupy different subcarriers for two slots. This is called a resource block pair allocated to the PUCCH is frequency-hopped at the slot boundary.
- FIG. 6 is a configuration diagram of a wireless communication system having multiple antennas.
- the transmission rate can be improved and the frequency efficiency can be significantly improved.
- the transmission rate can theoretically increase as the rate of increase rate R i multiplied by the maximum transmission rate R o when using a single antenna.
- a transmission rate four times higher than a single antenna system may be theoretically obtained. Since the theoretical capacity increase of multi-antenna systems was proved in the mid 90's, various techniques to actively lead to the actual data rate improvement have been actively studied. In addition, some technologies are already being reflected in various wireless communication standards such as 3G mobile communication and next generation WLAN.
- the research trends related to multi-antennas to date include the study of information theory aspects related to the calculation of multi-antenna communication capacity in various channel environments and multi-access environments, the study of wireless channel measurement and model derivation of multi-antenna systems, improvement of transmission reliability, and improvement of transmission rate. Research is being actively conducted from various viewpoints, such as research on space-time signal processing technology.
- the transmission signal when there are N T transmit antennas, the maximum information that can be transmitted is N T.
- the transmission information may be expressed as follows.
- Each transmission information The transmit power may be different.
- Each transmit power In this case, the transmission information whose transmission power is adjusted may be expressed as follows.
- Weighting matrix N T transmitted signals actually applied by applying Consider the case where is configured.
- Weighting matrix Plays a role in properly distributing transmission information to each antenna according to a transmission channel situation.
- Vector It can be expressed as follows.
- Received signal is received signal of each antenna when there are N R receiving antennas Can be expressed as a vector as
- channels may be divided according to transmit / receive antenna indexes. From the transmit antenna j to the channel through the receive antenna i It is indicated by. Note that in the order of the index, the receiving antenna index is first, and the index of the transmitting antenna is later.
- FIG. 6 (b) is a diagram illustrating a channel from the N T transmit antennas to the receive antenna i .
- the channels may be bundled and displayed in vector and matrix form.
- a channel arriving from a total of N T transmit antennas to a receive antenna i may be represented as follows.
- AWGN Additive White Gaussian Noise
- the received signal may be expressed as follows through the above-described mathematical modeling.
- the channel matrix indicating the channel state The number of rows and columns of is determined by the number of transmit and receive antennas.
- Channel matrix The number of rows is equal to the number of receive antennas N R
- the number of columns is equal to the number of transmit antennas N T. That is, the channel matrix The matrix is N R ⁇ N T.
- the rank of a matrix is defined as the minimum number of rows or columns that are independent of each other. Thus, the rank of the matrix cannot be greater than the number of rows or columns.
- Channel matrix Rank of ( ) Is limited to
- rank may be defined as the number of nonzero eigenvalues when the matrix is eigenvalue decomposition.
- another definition of rank may be defined as the number of nonzero singular values when singular value decomposition is performed. Therefore, the physical meaning of rank in the channel matrix is the maximum number that can send different information in a given channel.
- CoMP transmission and reception techniques also referred to as co-MIMO, collaborative MIMO, network MIMO, etc.
- CoMP technology can increase the performance of the terminal located in the cell-edge (cell-edge) and increase the average sector throughput (throughput).
- inter-cell interference may reduce performance and average sector yield of a terminal located in a cell boundary.
- ICI inter-cell interference
- the existing LTE system is located in a cell-boundary in an environment limited by interference using a simple passive technique such as fractional frequency reuse (FFR) through UE-specific power control.
- FFR fractional frequency reuse
- the method for the terminal to have a proper yield performance has been applied.
- CoMP transmission scheme may be applied.
- CoMP schemes applicable to downlink can be classified into joint processing (JP) techniques and coordinated scheduling / beamforming (CS / CB) techniques.
- JP joint processing
- CS / CB coordinated scheduling / beamforming
- the JP technique may use data at each point (base station) of the CoMP cooperative unit.
- CoMP cooperative unit means a set of base stations used in a cooperative transmission scheme.
- the JP technique can be classified into a joint transmission technique and a dynamic cell selection technique.
- the joint transmission technique refers to a technique in which a PDSCH is transmitted from a plurality of points (part or all of CoMP cooperative units) at a time. That is, data transmitted to a single terminal may be simultaneously transmitted from a plurality of transmission points. According to the joint transmission technique, the quality of a received signal may be improved coherently or non-coherently, and may also actively cancel interference to other terminals.
- Dynamic cell selection scheme refers to a scheme in which PDSCH is transmitted from one point (of CoMP cooperative units) at a time. That is, data transmitted to a single terminal at a specific time point is transmitted from one point, and other points in the cooperative unit do not transmit data to the corresponding terminal at that time point, and a point for transmitting data to the corresponding terminal is dynamically selected. Can be.
- CoMP cooperative units may cooperatively perform beamforming of data transmission for a single terminal.
- data is transmitted only in the serving cell, but user scheduling / beamforming may be determined by coordination of cells of a corresponding CoMP cooperative unit.
- coordinated multi-point reception means receiving a signal transmitted by coordination of a plurality of geographically separated points.
- CoMP schemes applicable to uplink may be classified into joint reception (JR) and coordinated scheduling / beamforming (CS / CB).
- the JR scheme means that a signal transmitted through a PUSCH is received at a plurality of reception points, while the CS / CB scheme receives a PUSCH only at one point, but user scheduling / beamforming is determined by coordination of cells of a CoMP cooperative unit. It means to be.
- the terminal can be jointly supported data from a multi-cell base station.
- each base station can improve the performance of the system by simultaneously supporting one or more terminals using the same radio frequency resource (Same Radio Frequency Resource).
- the base station may perform a space division multiple access (SDMA) method based on channel state information between the base station and the terminal.
- SDMA space division multiple access
- a serving base station and one or more cooperating base stations are connected to a scheduler through a backbone network.
- the scheduler may operate by receiving feedback of channel information about channel states between respective terminals and the cooperative base stations measured by each base station through the backbone network.
- the scheduler may schedule information for collaborative MIMO operation for the serving base station and one or more cooperating base stations. That is, the scheduler may directly give an indication of the cooperative MIMO operation to each base station.
- the CoMP system may be referred to as operating as a virtual MIMO system by combining a plurality of cells into one group, and basically, a communication technique of a MIMO system using multiple antennas may be applied.
- the MIMO scheme may be divided into an open-loop scheme and a closed-loop scheme.
- the open-loop MIMO scheme means that the transmitter performs MIMO transmission without feedback of the channel state information from the MIMO receiver.
- the closed-loop MIMO scheme means that the transmitter performs MIMO transmission by receiving the channel state information from the MIMO receiver.
- each of the transmitter and the receiver may perform beamforming based on channel state information in order to obtain a multiplexing gain of the MIMO transmit antenna.
- the transmitting end eg, the base station
- the channel state information (CSI) fed back may include a rank indicator (RI), a precoding matrix index (PMI), and a channel quality indicator (CQI).
- RI rank indicator
- PMI precoding matrix index
- CQI channel quality indicator
- RI is information about channel rank.
- the rank of the channel means the maximum number of layers (or streams) that can transmit different information through the same time-frequency resource. Since the rank value is determined primarily by the long term fading of the channel, it can be fed back over a generally longer period (ie less frequently) compared to PMI and CQI.
- PMI is information about a precoding matrix used for transmission from a transmitter and is a value reflecting spatial characteristics of a channel.
- Precoding means mapping a transmission layer to a transmission antenna, and a layer-antenna mapping relationship may be determined by a precoding matrix.
- the PMI corresponds to a precoding matrix index of a base station preferred by the terminal based on a metric such as a signal-to-interference plus noise ratio (SINR).
- SINR signal-to-interference plus noise ratio
- CQI is information indicating channel quality or channel strength.
- CQI may be expressed as a predetermined Modulation and Coding Scheme (MCS) combination. That is, the fed back CQI index indicates a corresponding modulation scheme and code rate.
- MCS Modulation and Coding Scheme
- the CQI is a value that reflects the received SINR obtained when the base station configures a spatial channel using the PMI.
- MU-MIMO multiuser-MIMO
- LTE-A systems systems that support extended antenna configurations (eg, LTE-A systems) are considering acquiring additional multiuser diversity using a multiuser-MIMO (MU-MIMO) scheme.
- MU-MIMO multiuser-MIMO
- the precoding information fed back by the receiver may be indicated by a combination of two PMIs.
- One of the two PMIs (first PMI) has the property of long term and / or wideband and may be referred to as W1.
- the other one of the two PMIs (second PMI) has a short term and / or subband attribute and may be referred to as W2.
- W1 reflects the frequency and / or time average characteristics of the channel.
- W1 reflects the characteristics of a long term channel in time, reflects the characteristics of a wideband channel in frequency, or reflects the characteristics of a wideband channel in frequency while being long term in time. It can be defined as.
- W1 is referred to as channel state information (or long term-wideband PMI) of long term-wideband attribute.
- W2 reflects a relatively instantaneous channel characteristic compared to W1.
- W2 is a channel that reflects the characteristics of a short term channel in time, reflects the characteristics of a subband channel in frequency, or reflects the characteristics of a subband channel in frequency while being short term in time. It can be defined as status information.
- W1 is referred to as channel state information (or short-term-subband PMI) of short-term-subband attribute.
- the precoding matrices representing the channel information of each attribute are There is a need to construct separate codebooks that are constructed (ie, the first codebook for W1 and the second codebook for W2).
- the form of the codebook configured as described above may be referred to as a hierarchical codebook.
- determining a codebook to be finally used using the hierarchical codebook may be referred to as hierarchical codebook transformation.
- a codebook may be converted using a long term covariance matrix of a channel as shown in Equation 12 below.
- W1 long term-wideband PMI
- W1 long term-wideband PMI
- W2 short-term subband PMI
- W1 corresponds to a precoding matrix included in the first codebook reflecting the channel information of the long-term-band attribute.
- W2 short-term subband PMI
- W2 represents a codeword constituting a codebook (for example, a second codebook) made to reflect channel information of short-term-subband attributes. That is, W2 corresponds to a precoding matrix included in the second codebook reflecting channel information of short-term subband attributes.
- W represents the codeword of the converted final codebook.
- norm (A) means a matrix in which norm is normalized to 1 for each column of the matrix A.
- W1 and W2 may have a structure as shown in Equation 13 below.
- W1 may be defined as a block diagonal matrix, and each block is the same matrix X i .
- One block X i may be defined as a matrix of size (Nt / 2) ⁇ M. Where Nt is the number of transmit antennas.
- the M value As the M value increases, the number of vectors fed back at one time to express a long term / wideband channel increases, thereby increasing feedback accuracy.
- the codebook size of W1 that is fed back at a lower frequency decreases and the feedback overhead increases as the codebook size of W2 that is fed back at a higher frequency increases. That is, there is a tradeoff between feedback overhead and feedback accuracy.
- the M value can be determined so that the feedback overhead does not increase too much while maintaining proper feedback accuracy.
- W2 Represents a predetermined phase value, respectively.
- 1 ⁇ k, l, m ⁇ M and k, l, m are integers, respectively.
- the codebook structure shown in Equation 13 above uses a cross-polarized (X-pol) antenna configuration, where the spacing between antennas is dense (typically, the distance between adjacent antennas is less than half the signal wavelength). It is a structure designed to reflect the correlation characteristics of the channel occurring in the case).
- the cross-polar antenna configuration can be shown in Table 1 below.
- the 8Tx cross-polar antenna configuration may be expressed as being composed of two antenna groups having polarities perpendicular to each other.
- Antennas of antenna group 1 (antennas 1, 2, 3, 4) have the same polarity (eg vertical polarization) and antennas of antenna group 2 (antennas 5, 6, 7, 8) have the same polarity ( For example, it may have horizontal polarization.
- the two antenna groups are co-located.
- antennas 1 and 5 may be installed at the same position
- antennas 2 and 6 may be installed at the same position
- antennas 3 and 7 may be installed at the same position
- antennas 2 and 8 may be installed at the same position.
- the antennas in one antenna group have the same polarity as a uniform linear array (ULA), and the correlation between antennas in one antenna group has a linear phase increment characteristic.
- the correlation between antenna groups has a phase rotated characteristic.
- Equation 14 shows an example in which the final codeword W is determined by multiplying the W1 codeword by the rank 1 and the W2 codeword.
- Equation 14 the final codeword is represented by a vector of Nt ⁇ 1, and a higher vector ( ) And subvector ( It is structured as two vectors of).
- Parent vector ) Represents the correlation characteristics of the horizontal polarity antenna group of the cross polarity antenna
- the lower vector ( ) Represents the correlation characteristics of the vertical polar antenna group.
- single-cell MU-MIMO can be enabled by using high accuracy channel feedback, and similarly, high accuracy channel feedback is required in CoMP operation.
- CoMP JT operation since several base stations cooperatively transmit the same data to a specific UE, it may theoretically be regarded as a MIMO system in which a plurality of antennas are geographically dispersed. That is, even in the case of MU-MIMO operation in CoMP JT, as in single-cell MU-MIMO, a high level of channel information accuracy is required to avoid co-scheduling between UEs.
- CoMP CB operation sophisticated channel information is required to avoid interference caused by the neighboring cell to the serving cell.
- Inter-cell interference coordination (ICIC)
- inter-cell interference coordination may be applied.
- Existing ICIC can be applied for frequency resources or for time resources.
- ICIC Interference Overhead Indication
- IOI UL Interference Overhead Indication
- UL HII UL HII
- the RNTP is information indicating downlink transmission power used by a cell transmitting an ICIC message in a specific frequency subregion.
- setting the RNTP field for a specific frequency subregion to a first value may mean that downlink transmission power of the corresponding cell does not exceed a predetermined threshold in the corresponding frequency subregion. Can be.
- setting the RNTP field for a specific frequency subregion to a second value may mean that the cell cannot promise downlink transmission power in the frequency subregion. .
- the value of the RNTP field is 0, the downlink transmission power of the corresponding cell in the frequency sub-domain may be considered low.
- the value of the RNTP field is 1, the corresponding cell in the frequency sub-domain is considered to be low.
- the downlink transmission power cannot be regarded as low.
- the UL IOI is information indicating the amount of uplink interference experienced (or received) by a cell transmitting an ICIC message in a specific frequency subdomain. For example, setting the IOI field for a specific frequency subregion to a value corresponding to a high interference amount may mean that the cell is experiencing strong uplink interference in the frequency subregion.
- the cell receiving the ICIC message may schedule a terminal using a low uplink transmission power among terminals served by the cell in a frequency sub region corresponding to an IOI indicating strong uplink interference.
- the UEs since the UEs perform uplink transmission with low transmission power in the frequency sub-region corresponding to the IOI indicating strong uplink interference, the uplink interference experienced by the neighbor cell (that is, the cell transmitting the ICIC message) can be alleviated. Can be.
- the UL HII is information indicating the degree of interference (or uplink interference sensitivity) that an uplink transmission in a cell transmitting an ICIC message can cause for a corresponding frequency subregion. For example, when the HII field is set to a first value (eg, 1) for a specific frequency subregion, a cell transmitting an ICIC message may schedule a terminal of a strong uplink transmission power for that frequency subregion. It can mean that there is a possibility. On the other hand, when the HII field is set to a second value (for example, 0) for a specific frequency subregion, it is likely that a cell transmitting an ICIC message schedules a terminal of weak uplink transmission power for the corresponding frequency subregion. It can mean that there is.
- a first value eg, 1
- a cell transmitting an ICIC message may schedule a terminal of a strong uplink transmission power for that frequency subregion. It can mean that there is a possibility.
- a second value for example, 0
- the cell receiving the ICIC message preferentially schedules the UE in the frequency sub region in which the HII is set to the second value (for example, 0) and the frequency sub in which the HII is set to the first value (for example, 1). In the region, by scheduling terminals that can operate well even with strong interference, interference from a cell that transmits an ICIC message can be avoided.
- a given entire time domain is divided into one or more sub-domains (eg, subframe units) on frequency, and each A method of exchanging between cells whether or not silencing the time sub-region is defined.
- the cell transmitting the ICIC message may transmit information indicating that silencing is performed in a specific subframe to neighboring cells, and do not schedule PDSCH or PUSCH in the subframe.
- the cell receiving the ICIC message may schedule uplink and / or downlink transmission for the terminal on a subframe in which silencing is performed in the cell which transmitted the ICIC message.
- Silence may refer to an operation in which a specific cell does not perform most signal transmission on uplink and downlink (or 0 or weak power transmission is performed) in a specific subframe.
- a specific cell may configure a specific subframe as a multicast broadcast single frequency network (MBSFN) subframe.
- MBSFN multicast broadcast single frequency network
- a signal is transmitted only in the control region and no signal is transmitted in the data region.
- an interfering cell may set a specific subframe to an Almost Blank Subframe (ABS) or ABS-with-MBSFN.
- ABS Almost Blank Subframe
- ABS refers to a subframe in which only the CRS is transmitted in the control region and the data region of the downlink subframe, and other control information and data are not transmitted (or only weak power transmission is performed).
- downlink channels and downlink signals such as PBCH (Physical Broadcast CHannel), PSS (Primary Synchronization Signal), and SSS (Secondary Synchronization Signal) may be transmitted.
- ABS-with-MBSFN means that the CRS of the data area is not transmitted in the above-described ABS.
- silencing may be performed in units of a specific subframe, and information indicating whether silencing is performed may be referred to as a silent subframe pattern.
- the silent subframe described in the embodiments of the present invention may be understood as a subframe in which no signal is transmitted or a subframe in which a signal of weak power is transmitted.
- the above-described silent subframes of various methods will be collectively described as ABS.
- CoMP cluster refers to a set of transmission points for performing CoMP operation cooperatively.
- the term CoMP cluster or cluster is used for clarity, but the principles described in the present invention may be equally applied as an interference coordination scheme for 'a group of transmission points composed of one or more transmission points'.
- FIG. 7 is a diagram illustrating examples of a configuration of a CoMP cluster.
- FIG. 7A shows an example in which each transmission point in one cluster forms a different cell.
- each transmission point may correspond to an eNB and may have a separate cell ID.
- 7 (b) shows an example in which all transmission points in one cluster share the same cell ID. That is, the transmission points constituting the exemplary cluster of FIG. 7 (b) may correspond to a distributed antenna of one cell or may be referred to as a remote radio head (RRH).
- RRH remote radio head
- transmission points within the same cluster are connected by high-performance links (eg, supporting high capacity, low latency) for close cooperation, while lowering between different clusters. It may be linked by a link of capabilities. Therefore, an ICIC scheme considering the link performance between CoMP clusters is required.
- the existing ICIC is defined that the ICIC is performed in terms of one transmission point. According to this definition, ICIC in consideration of the characteristics of the CoMP cluster as in the above example of FIG. 7 cannot be appropriately supported. Accordingly, the present invention proposes a method capable of appropriately supporting coordination between CoMP clusters in consideration of causes and aspects of interference between CoMP clusters.
- an interfering side is called an aggressor cluster or an attacker cell
- an interfering side is called a victim cluster or a victim cell
- the ICIC message exchanged between the clusters and the cells may include information on interference coordination (eg, transmission power setting) in the time domain and / or the frequency domain.
- the interference coordination information in the time domain may include, for example, ABS setting related information transmitted by the attacker side, ABS status information transmitted by the victim side, and the like.
- the ABS status information transmitted by the victim side may be information indicating what percentage of ABS resources are used among the ABS set by the assailant, and the receiving party may use it to update its ABS configuration.
- the interference coordination information in the frequency domain may include, for example, RNTP or HII information on the offender side, IOI information on the victim side, and the like.
- the present invention proposes a method in which an ICIC in a CoMP cluster unit and an ICIC in a transmission point unit constituting a CoMP cluster coexist. Accordingly, it is possible to support efficient and accurate ICIC in a wireless communication system in which a transmission point group (for example, a CoMP cluster) is configured.
- a transmission point group for example, a CoMP cluster
- This embodiment relates to a method for indicating that an ICIC message is related to a specific transmission point (TP) in the exchange of inter-cluster interference coordination messages.
- TP transmission point
- ICICs for other transmission points in the cluster, separate inter-cluster interference coordination messages (ie, ICIC messages related to the other transmission points) may be used.
- ICIC information about individual transmission points included in one cluster may be expressed using an inter-cluster interference coordination message.
- the inter-cluster interference coordination message may basically include cluster-specific (or cluster-specific) ICIC information, which is not suitable for expressing ICIC information for individual transmission points included in the cluster.
- FIG. 8 is a diagram illustrating an example of coordination between CoMP clusters.
- a transmission point belonging to CoMP Cluster 1 causes interference
- CoMP Cluster 2 receives interference.
- Cell1 may inform Cell2 that the ICIC message is related to RRH1 in transmitting the ICIC message to Cell2.
- the information indicating the transmission point may be information (that is, transmission point identification information) that distinguishes one transmission point from another transmission point.
- information that is, transmission point identification information
- it may be an identifier (ie, a separate identifier different from the cell ID) of a specific transmission point.
- multiple transmission points present in one cell may be distinguished by an antenna port index of a reference signal (RS) of one cell.
- RS reference signal
- antenna ports 0 to 3 may be defined in one cell.
- the macro eNB corresponds to CRS ports 0 and 1, and RRH1 is CRS port 2.
- RRH2 may correspond to CRS port 3.
- the macro eNB, RRH1, and RRH2 all use the same cell ID, they can be distinguished by the CRS port.
- an ICIC message related to CRS port 2 is defined, this may mean that the ICIC message is related to RRH1.
- a plurality of transmission points existing in one cell may be distinguished by a channel state information-reference signal (CSI-RS) configuration used for channel estimation.
- the CSI-RS is a reference signal used by the UE for the calculation / decision of the CSI.
- a plurality of CSI-RS configurations may be used in one cell.
- the plurality of CSI-RS settings are used to generate the CSI-RS transmission in time (transmission period, start point offset, transmission period, etc.), CSI-RS antenna ports (antenna ports 15 to 22), or CSI-RS generation.
- One or more of the sequences may be distinguished by being set differently.
- RRH1 may correspond to CSI-RS configuration 0
- RRH2 may correspond to CSI-RS configuration 1. In this case, when an ICIC message related to CSI-RS configuration 0 is defined, this may mean that the ICIC message is related to RRH1.
- the ICIC message including the ICIC information field may include information indicating what transmission point the ICIC information field is associated with.
- the information indicating the transmission point may be defined as an additional field in the ICIC message, or may be defined as reusing some bit state of an existing field.
- the information indicating the transmission point associated with the ICIC message may be delivered to the neighboring cluster (or cell) through a separate signaling other than the ICIC message.
- the ICIC message is valid only for RRH1, and interference coordination information of another transmission point is exchanged between cells (or between clusters) through a separate ICIC message. Can be.
- DL ICIC message such as ABS configuration information or RNTP information
- the ICIC message includes information indicating that the DL ICIC information is related to RRH1
- the ICIC message is received.
- One Cell2 may be recognized as ABS configuration information and RNTP information in downlink transmission of RRH1.
- DL ICIC information about another transmission point of Cell1 may be transmitted to Cell2 through a separate ICIC message.
- the perpetrator transmits an uplink (UL) ICIC message such as HII information
- UL ICIC message such as HII information
- the received Cell2 is uplink of RRH1. It can recognize that it is HII information in reception.
- UL ICIC information about another transmission point of Cell1 may be transmitted to Cell2 through a separate ICIC message.
- a victim transmits a UL ICIC message such as IOI, and the information indicating that the IOI information is related to RRH4 is included in the ICIC message, the received Cell1 is in an uplink reception environment of RRH4. It may be recognized as IOI information.
- UL ICIC information about another transmission point of Cell2 may be transmitted to Cell1 through a separate ICIC message.
- the victim, Cell2 may send a message to Cell1 requesting interference coordination at a specific transmission point of the offender, Cell1.
- Cell2 may transmit ABS state information while indicating that the ABS state information is for RRH1 of Cell1.
- Cell2 may indicate that the frequency domain ICIC information is for RRH1 of Cell1.
- ABS status information and / or transmission power reduction request information for another transmission point may be transmitted to Cell1 through a separate ICIC message.
- inter-cluster interference coordination messages can be defined to represent transmission point-specific ICIC information, ICIC information can be exchanged for individual transmission points within a group of transmission points, thereby providing more accurate ICIC. Can support the operation.
- a case in which a plurality of transmission points in one cluster have the same cell ID as illustrated in FIG. 7B or 8 is illustrated.
- the scope of the present invention is not limited thereto. That is, the principle of the present invention that the transmission point identification information is provided together with the inter-cluster interference coordination message may be equally applied to the case where a plurality of transmission points in one cluster form individual cells as shown in FIG. .
- This embodiment relates to an interference coordination scheme that considers the total amount of inter-cluster interference in the exchange of inter-cluster interference coordination messages.
- Precise ICIC operation may be supported when only cluster-specific ICIC information and / or transmission point-specific ICIC information are considered in inter-cluster interference coordination, but the overall yield of the system and Efficiency can be reduced.
- the second embodiment since ICIC operation can be performed while maintaining the maximum transmission power (that is, the total amount of interference from the victim's point of view) of transmission points belonging to one cluster, the system overall yield and efficiency can be maintained / improduced. Can be.
- the second embodiment may be applied simultaneously or independently of the first embodiment.
- FIG. 9 is a diagram illustrating another example of coordination between CoMP clusters.
- a CoMP operation is performed by a joint transmission method at transmission points belonging to CoMP cluster 1.
- data for a specific terminal in CoMP cluster 1 may be simultaneously transmitted from a plurality of transmission points.
- pico base station 1 pico eNB 1
- macro base station 1 macro eNB1
- pico base station 1 and macro base station 1 may simultaneously transmit downlink data to the terminal.
- downlink data can be transmitted under a high quality channel condition to a specific terminal by using the transmission power of a transmission point without downlink traffic.
- the system performance may be improved in terms of CoMP cluster 1 alone, but interference to neighbor cells (or clusters) may be increased. That is, the total transmission power of Cluster 1 when Pico Base Station 1 does not transmit is compared with the total transmission power of CoMP Cluster 1 when Pico Base Station 1 performs additional transmission and there is no change in transmission power of other transmission points. In this case, the total amount of transmission power in the latter case is increased, and thus the amount of interference for the neighboring cell is increased.
- interference coordination in consideration of the total amount of interference between CoMP clusters, more effective interference coordination and system performance improvement can be achieved.
- coordination between CoMP clusters enables more efficient scheduling for UEs located at CoMP cluster boundaries.
- CoMP Cluster 1 may deliver a message to Cluster CoMP 2 that includes cluster-specific ICIC information.
- the cluster-specific ICIC information may be information promising an operation for interference that Cluster 1 will have on neighboring clusters at the cluster level.
- CoMP Cluster 1 sends an RNTP message to CoMP Cluster 2, where the RNTP message is not information about the transmit power of individual transmit points in Cluster 1 but information about the sum of the transmit powers of the transmit points belonging to Cluster 1. Can be called. That is, the RNTP message indicates that, in a particular frequency band (s), the sum of the transmission powers of the transmission points belonging to Cluster 1 will not exceed a predetermined threshold, and in other frequency band (s), the guarantee of the total transmission power is guaranteed. I can tell you I can't.
- the sum of the transmit powers of the clusters may be the sum of the transmit powers to which a weight for each transmission point belonging to the cluster is applied.
- the weight may be determined in consideration of the distance from each transmission point of the cluster to the cell receiving the ICIC message. For example, in the example of FIG. 9, since pico base station 2 is located far from the victim cluster as compared to pico base station 1, even when operating at a higher transmission power than pico base station 1, interference to the victim cluster is not greatly induced. Relatively small weights may be assigned to pico base station 2. Similarly, pico base station 1 may be given a higher weight than pico base station 2. In addition, the weight for the transmit power of the macro base station may be given about the middle of the weights for pico base station 1 and 2.
- CoMP Cluster 2 schedules terminals served by CoMP Cluster 2 under the assumption that the total amount of interference (or sum of transmit powers) of CoMP Cluster 1 is kept below a predetermined threshold at a specific frequency. can do.
- CoMP Cluster 2 may send a message to CoMP Cluster 1 requesting adjustment for the total amount of interference from CoMP Cluster 1. For example, CoMP cluster 2 may inform CoMP cluster 1 that the total amount of interference of CoMP cluster 1 is greater or less than a predetermined reference value. In addition, CoMP cluster 2 may transmit information to CoMP cluster 1 requesting to reduce the total sum of transmission powers in a specific frequency domain.
- the total transmission power of CoMP Cluster 1 may be adjusted / determined to a predetermined value. Additionally, CoMP Cluster 1 can dynamically adjust the transmit power of the transmit points in the cluster under conditions that maintain the determined transmit power sum. In particular, when inter-cluster interference coordination is semi-static, dynamic power coordination enables optimal transmission power allocation corresponding to traffic load fluctuations, interference situation changes, and the like.
- CoMP cluster 2 reports strong interference on downlink to CoMP cluster 1.
- the report may include identification information of a transmission point subject to strong interference in CoMP cluster 2 and / or identification information of a transmission point causing strong interference in CoMP cluster 1.
- CoMP Cluster 1 transmits within the cluster in such a way as to reduce the transmit power of the reported transmission point that causes interference, while increasing the transmit power of another transmission point, while maintaining the total cluster transmit power. Power allocation can be adaptively adjusted.
- CoMP Cluster 1 when the total transmission power of CoMP Cluster 1 is determined as A, the macro base station 1 is allocated an A / 2 transmit power and the pico base stations 1 and 2 are each A / 4 transmitted. Assume a case where power is allocated. At this time, a report including information indicating that pico eNB4 of CoMP cluster 2 is subjected to strong interference and / or information indicating that pico eNB1 of CoMP cluster 1 causes strong interference may be transmitted from CoMP Cluster 2 to CoMP Cluster 1. In this case, CoMP cluster 1 can be adjusted by allocating A / 2 transmit power to macro base station 1, A / 8 transmit power to pico base station 1, and 3A / 8 transmit power to pico base station 2. have.
- the transmission power allocation may be performed by assigning a weight to each transmission point of CoMP cluster 1.
- the weight w1 is assigned to the pico eNB1 closest to CoMP cluster 2
- the weight w2 is assigned to the pico eNB2
- w1 2 * w2.
- This weighting is applied in the case of increasing the transmission power to the same degree for Pico eNB1 and Pico eNB2, and in the case of Pico eNB1 affecting twice the interference increase compared to Pico eNB2 in view of the increase in interference received by CoMP Cluster2. May be appropriate.
- proper transmission power allocation may be performed in consideration of the weight of each transmission point while maintaining the total transmission power.
- CoMP Cluster 1 may send a message asking CoMP Cluster 2 whether the new power allocation solves the interference problem for CoMP Cluster 2.
- CoMP Cluster 2 can determine whether the interference received by CoMP Cluster 1 is acceptable according to the new power allocation of CoMP Cluster 1, and transmit the result to CoMP Cluster 1. If CoMP Cluster 2 feeds back as unable to accept interference due to CoMP Cluster 1's new power allocation, CoMP Cluster 1 may re-adjust the power allocation in a way to further reduce the transmit power of transmission points close to CoMP Cluster 2. Can be.
- CoMP cluster 1 may perform interference coordination (or transmit power coordination) in a manner that reduces the total transmit power total.
- the inter-cluster interference coordination and cluster transmit power coordination schemes proposed by the present invention have been described based on the RNTP message for downlink frequency resources transmitted by the attacker cluster, but the scope of the present invention is limited thereto. It is not. That is, the principle of the present invention for performing inter-cluster interference coordination based on the total transmission power in one CoMP cluster includes an ICIC operation such as ABS configuration for downlink time resources and an ICIC operation such as HII and IOI for uplink resources. The same can be applied to.
- an ICIC operation such as ABS configuration for downlink time resources
- an ICIC operation such as HII and IOI for uplink resources. The same can be applied to.
- CoMP Cluster 1 that has received HII for a particular resource (resource defined in the time domain and / or frequency domain) from CoMP Cluster 2 reduces the total sum of transmit power in that resource.
- the ICIC operation may be performed to reduce the transmission power allocated to the transmission point of the location having a great impact on CoMP cluster 2.
- CoMP cluster 1 is a transmission point that causes the smallest interference in terms of CoMP cluster 2 (ie, the transmission point farthest away from CoMP cluster 2, or a transmission point serving only terminals within relatively narrow coverage, etc.). It is possible to operate so that scheduling is performed intensively.
- CoMP cluster 1 may operate so that terminals capable of performing communication with the smallest power possible, or terminals connected to a pico base station having relatively narrow coverage, may be scheduled intensively. Meanwhile, in a specific resource for which low interference is indicated, the terminal may be connected to a macro base station requiring high transmission power, or may be scheduled to be performed by a transmission point close to CoMP cluster 2.
- FIG. 1 may operate so that terminals capable of performing communication with the smallest power possible, or terminals connected to a pico base station having relatively narrow coverage, may be scheduled intensively. Meanwhile, in a specific resource for which low interference is indicated, the terminal may be connected to a macro base station requiring high transmission power, or may be scheduled to be performed by a transmission point close to CoMP cluster 2.
- This embodiment relates to a method of considering the ICIC operation according to the above-described embodiments in performing the CoMP operation. For example, in determining whether to perform a CoMP joint transmission operation, the amount of interference for an adjacent cell (or cluster) may be considered.
- this embodiment proposes to perform the joint transmission only when the performance gain due to the joint transmission (JT) is significantly higher than the performance loss due to the increase in the amount of interference.
- the CoMP cluster may define a metric as shown in Equation 15 below.
- M is a CoMP JT scheduling metric.
- the transmission power of each transmission point may be determined so that the M value is maximum, and the terminal may be paired.
- R JT is a transmission rate that can be obtained when performing CoMP JT
- P JT means transmission power when performing CoMP JT.
- ⁇ is a coefficient that penalizes the transmit power for the JT operation (ie, reflects the amount of interference for adjacent cells).
- the transmission power for the JT operation corresponds to the sum totally applied to the transmission power of each transmission point according to the distance, reflecting the distance between each of the transmission points participating in the JT and an adjacent cell (or cluster). You may.
- the matters described in various embodiments of the present invention may be independently applied or two or more embodiments may be simultaneously applied. Duplicate content is omitted for clarity.
- FIG. 10 is a diagram illustrating a configuration of an apparatus for performing interference coordination according to the present invention.
- the interference coordination apparatus 1010 may include a reception module 1011, a transmission module 1012, a processor 1013, a memory 1014, and a plurality of antennas 1015.
- the plurality of antennas 1015 refers to a base station apparatus that supports MIMO transmission and reception.
- the receiving module 1011 may receive various signals, data, and information from the outside.
- the transmission module 1012 may transmit various signals, data, and information from the outside.
- the processor 1013 may control the overall operation of the interference coordination apparatus 1010.
- the receiving module 1011 of the interference coordination apparatus 1010 is configured to receive an interference coordination message from another transmission point group, and the transmission module 1012 transmits the interference coordination message to another transmission point group. Can be configured to transmit.
- the processor 1013 may be configured to control the exchange of interference coordination messages between the transmitting point group through the receiving module 1011 and the transmitting module 1012.
- the interference coordination message may include interference coordination information for individual transmission point units and / or transmission point group units as described in the above embodiments.
- the description of the interference coordination apparatus 1010 in the example of FIG. 10 may be implemented as an apparatus for controlling a transmission point group.
- the apparatus for controlling the transmission point group may correspond to one transmission point of the transmission point group, or may be implemented as a control device separate from the transmission point.
- the processor 1013 of the interference coordination apparatus 1010 performs a function of processing the information received by the interference coordination apparatus 1010, information to be transmitted to the outside, and the memory 1014 stores the processed information and the like. It may be stored for a predetermined time and may be replaced by a component such as a buffer (not shown).
- the specific configuration of the interference coordination apparatus as described above may be implemented so that the above-described matters described in various embodiments of the present invention may be independently applied or two or more embodiments may be simultaneously applied, and overlapping descriptions will be omitted for clarity. .
- Embodiments of the present invention described above may be implemented through various means.
- embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
- a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs Application Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs Digital Signal Processing Devices
- PLDs Programmable Logic Devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
- Embodiments of the present invention as described above may be applied to various mobile communication systems.
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Abstract
Description
Claims (11)
- 무선 통신 시스템에서 간섭 조정을 수행하는 방법으로서,전송 포인트 그룹 간에 간섭 조정 메시지를 교환하는 단계를 포함하고,하나의 전송 포인트 그룹은 복수개의 전송 포인트들을 포함하고,상기 간섭 조정 메시지는, 상기 하나의 전송 포인트 그룹 내의 개별 전송 포인트 단위에 대한 간섭 조정 정보, 및 상기 하나의 전송 포인트 그룹 내의 전체 전송 포인트 단위에 대한 간섭 조정 정보를 포함하는, 간섭 조정 방법.
- 제 1 항에 있어서,상기 간섭 조정 메시지는, 상기 개별 전송 포인트에 대한 식별 정보를 더 포함하는, 간섭 조정 방법.
- 제 2 항에 있어서,상기 식별 정보는,상기 전송 포인트의 식별자, 참조신호의 안테나 포트 인덱스, 또는 채널상태정보-참조신호의 설정(configuration) 인덱스 중 하나를 포함하는, 간섭 조정 방법.
- 제 2 항에 있어서,상기 하나의 전송 포인트 그룹 내의 전송 포인트들은 동일한 셀 식별자를 가지는, 간섭 조정 방법.
- 제 1 항에 있어서,상기 간섭 조정 메시지는, 상기 하나의 전송 포인트 그룹 내의 복수개의 전송 포인트의 전송 전력 총합에 대한 정보를 포함하는, 간섭 조정 방법.
- 제 5 항에 있어서,상기 전송 전력 총합은 상기 복수개의 전송 포인트에 대한 가중치에 기초하여 결정되는, 간섭 조정 방법.
- 제 6 항에 있어서,상기 가중치는, 상기 하나의 전송 포인트 그룹 내의 복수개의 전송 포인트의 각각과 다른 전송 포인트 그룹 사이의 거리에 기초하여 결정되는, 간섭 조정 방법.
- 제 5 항에 있어서,상기 하나의 전송 포인트 그룹 내에서, 상기 전송 전력 총합을 유지하면서, 상기 복수개의 전송 포인트에 대한 전송 전력이 할당이 조절되는, 간섭 조정 방법.
- 제 1 항에 있어서,상기 하나의 전송 포인트 그룹 내의 복수개의 전송 포인트의 협력 통신은, 상기 협력 통신에 의해 달성되는 전송 레이트가 상기 협력 통신에 의해 유발되는 간섭량에 비해 큰 경우에 수행되는, 간섭 조정 방법.
- 제 1 항에 있어서,상기 간섭 조정 메시지는,ABS(Almost Blank Subframe) 설정 정보, ABS 상태(status) 정보, RNTP(Relative Narrowband Transmission Power) 정보, IOI(Interference Overhead Indication) 정보, 또는 HII(High Interference Indication) 정보 중에서 하나 이상을 포함하는, 간섭 조정 방법.
- 무선 통신 시스템에서 간섭 조정을 수행하는 장치로서,다른 전송 포인트 그룹으로 간섭 조정 메시지를 송신하는 전송 모듈;상기 다른 전송 포인트 그룹으로부터 간섭 조정 메시지를 수신하는 수신 모듈; 및상기 전송 모듈 및 상기 수신 모듈을 통한 전송 포인트 그룹 간의 간섭 조정 메시지의 교환을 제어하도록 구성된 프로세서를 포함하고;하나의 전송 포인트 그룹은 복수개의 전송 포인트들을 포함하고,상기 간섭 조정 메시지는, 상기 하나의 전송 포인트 그룹 내의 개별 전송 포인트 단위에 대한 간섭 조정 정보, 및 상기 하나의 전송 포인트 그룹 내의 전체 전송 포인트 단위에 대한 간섭 조정 정보를 포함하는, 간섭 조정 방법.
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US14/238,670 US9264204B2 (en) | 2011-08-17 | 2012-08-16 | Method and apparatus for inter-cell interference coordination for transmission point group |
KR1020147003520A KR101590488B1 (ko) | 2011-08-17 | 2012-08-16 | 전송 포인트 그룹에 대한 셀간 간섭 조정 방법 및 장치 |
EP12823664.3A EP2747302B1 (en) | 2011-08-17 | 2012-08-16 | Method and apparatus for inter-cell interference coordination for transmission point group |
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US20140211734A1 (en) | 2014-07-31 |
US9264204B2 (en) | 2016-02-16 |
EP2747302A2 (en) | 2014-06-25 |
KR101590488B1 (ko) | 2016-02-01 |
KR20140044390A (ko) | 2014-04-14 |
EP2747302A4 (en) | 2015-04-08 |
WO2013025051A3 (ko) | 2013-06-13 |
EP2747302B1 (en) | 2016-11-30 |
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