WO2012021047A2 - Appareil et procédé pour la transmission d'informations de silence et appareil et procédé permettant d'acquérir l'état d'un canal au moyen de ce dernier - Google Patents

Appareil et procédé pour la transmission d'informations de silence et appareil et procédé permettant d'acquérir l'état d'un canal au moyen de ce dernier Download PDF

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Publication number
WO2012021047A2
WO2012021047A2 PCT/KR2011/006008 KR2011006008W WO2012021047A2 WO 2012021047 A2 WO2012021047 A2 WO 2012021047A2 KR 2011006008 W KR2011006008 W KR 2011006008W WO 2012021047 A2 WO2012021047 A2 WO 2012021047A2
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Prior art keywords
muting
csi
information
cell
bits
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Korean (ko)
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WO2012021047A3 (fr
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윤성준
박경민
서성진
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Pantech Co Ltd
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Pantech Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information

Definitions

  • An embodiment of the present invention relates to a wireless communication system, and more particularly, in a wireless communication system, when a channel state information-reference signal (CSI-RS) is allocated, In the method and apparatus for muting the entire or partial resource region of the resource space (PDSCH, Physical Downlink Shared Channel) for data transmission of the serving cell to avoid interference of the It is about.
  • CSI-RS channel state information-reference signal
  • the current mobile communication system is a high-speed, high-capacity communication system that can transmit and receive various data such as video and wireless data, away from voice-oriented services, and it is only required to develop a technology capable of transmitting large-capacity data corresponding to a wired communication network.
  • proper error detection method is essential to improve system performance by minimizing the reduction of information loss and increasing system transmission efficiency.
  • various reference signals are used to provide information on a communication environment to the counterpart device through uplink or downlink.
  • a cell-specific reference signal which is a reference signal or a reference signal, is received every subframe in order to identify channel information during downlink transmission. each subframe).
  • CRS cell-specific reference signal
  • the CRS is differently allocated in time / frequency for each of four antennas according to the maximum number of antenna ports supported by downlink of the LTE system and transmitted.
  • uplink can support up to 8 antennas. Therefore, in order to grasp channel information during downlink transmission, there is a limit to CRS defined only for the existing 4 antennas.
  • CRS channel information
  • CSI-RS CSI-RS
  • CSI-RS is newly defined to determine the channel state information for up to eight antennas.
  • CSI-RS should be transmitted. Although the basic definition and overhead of CSI-RS are defined, the method of allocating and transmitting the corresponding CSI-RS pattern to each resource area for each antenna / base station (cell) Is not determined.
  • An embodiment of the present invention is to provide an apparatus and method for transmitting or receiving a CSI-RS by assigning it to a time-frequency resource region for each antenna port.
  • Another embodiment of the present invention is to provide a technique for muting not transmitting data in the CSI-RS allocation resource region of another cell in resource allocation of each cell (CSI-RS).
  • Another embodiment of the present invention is to provide a technique for generating, transmitting and receiving muting information indicating a data muting area when transmitting a CSI-RS.
  • the present invention in consideration of one or more of the CSI-RS pattern, the number of CSI-RS antenna ports, the CSI-RS duty cycle, and the CSI-RS transmission subframe offset information of a neighbor cell, It is intended to provide a technique for generating, transmitting and receiving muting information indicating a muting area in which data is not allocated when allocating resources.
  • Another embodiment of the present invention is to provide a technique for transmitting and receiving muting information, and resource allocation of the CSI-RS so as not to send data to the muting area based on the muting information.
  • Another embodiment of the present invention is to provide a technique for estimating or obtaining a channel state by receiving muting information and then decoding it in consideration of the muting region based thereon.
  • a specific cell transmits muting information considering the CSI-RS interference of a neighbor cell, wherein the specific cell includes a CSI-RS pattern and a CSI-RS antenna from the neighbor cell.
  • Receiving CSI-RS information of a neighbor cell including at least one of port number, CSI-RS transmission cycle, CSI-RS transmission subframe offset information, and based on the CSI-RS information of the neighbor cell; Determining a muting region, which is a time / frequency region requiring muting by overlapping with the CSI-RS of the adjacent cell, a first data field indicating a period and offset of muting subframes including the muting region, and the muting Second data having a bit number of 12 to 28 bits indicating a specific muting pattern to be muted in subframes and indicating whether or not muting is applied in a bitmap format. It provides a muting information transmission method comprising the step of transmitting the generated phase and the muting information to generate the muting information including the de to the terminal.
  • an embodiment of the present invention is a method for acquiring a channel state of each cell after a receiver receives a CSI-RS from two or more cells, wherein the receiver is a muting subframe from a serving cell among two or more cells.
  • a first data field indicating a period and an offset of each field and a specific muting pattern to be muted in the muting subframes, and one of 12 to 28 bits indicating whether to apply muting in a bitmap format.
  • Receiving muting information including a second data field comprising a number of bits of the neighboring cell; and neighboring areas corresponding to a partial region muted by the muting information in a CSI-RS of a serving cell and a resource space for data transmission of a serving cell; Receiving a CSI-RS of a neighbor cell transmitted from a resource region of a cell, and resource for data transmission of the serving cell using the muting information Identifying a muting region in the liver, identifying a CSI-RS transmission region of a neighboring cell corresponding thereto, and acquiring a channel state by decoding the CSI-RS of the serving cell and the neighboring cell in consideration of the muting region; It provides a channel state acquisition method comprising.
  • At least one of the CSI-RS pattern, the number of CSI-RS antenna ports, CSI-RS duty cycle, CSI-RS transmission subframe offset information from one or more adjacent cells in a multi-cell environment A neighbor cell information receiver for receiving CSI-RS information of a neighbor cell including a neighbor cell and overlapping with a CSI-RS of a neighbor cell in a resource space for data transmission of a serving cell based on the CSI-RS information of the neighbor cell;
  • a muting region determiner for determining a muting region that is a time / frequency region requiring muting, a first data field indicating the muting region, the period and offset of muting subframes, and muting within the muting subframes
  • a second data field consisting of a bit number of 12 to 28 bits indicating whether muting is applied in a bitmap format. Muting information provides a muting Reporting CSI-RS muting information transmission
  • a first data field indicating a period and offset of muting subframes from a serving cell among two or more cells and a specific muting pattern to be muted in the muting subframes are provided.
  • a muting information receiver configured to receive muting information including a second data field having a number of bits of 12 to 28 bits indicating whether the muting is applied in a bitmap format, the CSI-RS of the serving cell and the serving cell
  • a CSI-RS receiver for receiving a CSI-RS signal of a neighbor cell transmitted from a resource region of a neighboring cell corresponding to a partial region muted by the muting information in a resource space for data transmission, and using the muting information Check the muting region in the resource space for data transmission of the serving cell and determine the corresponding CSI-RS transmission resource region of the neighboring cell.
  • Reduction provides the channel state obtaining apparatus including considering the muting area identification unit and the muting area acquisition channel conditions obtaining channel state by decoding the CSI-
  • FIG. 1 is a diagram schematically illustrating a wireless communication system to which an embodiment of the present invention is applied.
  • FIGS. 2 to 13 illustrate representative examples of CSI-RS mapping in one subframe
  • FIGS. 2 to 5 generally apply to both FS1 (FDD) and FS2 (TDD), and are normal CPs.
  • 6 to 9 are generally applied to both FS1 (FDD) and FS2 (TDD), and are extended CP
  • FIGS. 10 to 13 are additional options for FS2 (TDD).
  • FIGS. 10 and 11 show normal CPs
  • FIGS. 12 and 13 show extended CPs.
  • FIG. 14 illustrates a multi-cell environment to which the present embodiment is applied.
  • 15 is a flowchart illustrating a method of transmitting CSI-RS muting information according to the present embodiment
  • 17 is a flowchart illustrating a method of obtaining channel information in a terminal using muting information according to the present embodiment
  • FIG. 18 is a configuration diagram of a CSI-RS muting information transmitting apparatus according to the present embodiment
  • FIG. 20 is a diagram illustrating a frame and resource space configuration indicating a state in which a CSI-RS of an actual serving cell is muted by the muting information of FIG. 19.
  • 21 is a configuration diagram of a channel state obtaining apparatus using muting information according to the present embodiment.
  • FIG. 1 illustrates a wireless communication system to which embodiments of the present invention are applied.
  • the wireless communication system provides various communication services such as voice and packet data.
  • a wireless communication system includes a user terminal 10 (hereinafter referred to as “UE”) and a base station 20 (evolved-node-b; hereinafter referred to as “eNodeB”).
  • UE user terminal
  • eNodeB evolved-node-b
  • the UE 10 and the eNodeB 20 are applied to the muting information generation technique and the channel state acquisition technique using the same as the embodiment described below, which will be described in detail with reference to FIG.
  • the UE 10 is a term including a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, and the like.
  • An eNodeB or cell is a fixed station that communicates with a UE, such as a Node-B, a Sector, a Site, a Base Transceiver System, or an Access Point. (Access Point), relay node (Relay Node) may be called in other terms.
  • the eNodeB should be interpreted in a comprehensive sense to indicate some areas or functions covered by the Base Station Controller (BSC) in CDMA, the Radio Network Controller (RNC) in WCDMA, and the like. In addition, it may include coverage areas of various cells such as megacell, macrocell, microcell, picocell, femtocell, and relay node communication range.
  • BSC Base Station Controller
  • RNC Radio Network Controller
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme transmitted using different times, or a frequency division duplex (FDD) scheme transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • An embodiment of the present invention describes a wireless communication system as an example, and evolves into asynchronous wireless communication evolving into Long Term Evolution (LTE) and LTE-advanced through GSM, WCDMA, HSPA, and CDMA, CDMA-2000 and UMB. It can be applied to resource allocation in the field of synchronous wireless communication.
  • LTE Long Term Evolution
  • LTE-advanced through GSM, WCDMA, HSPA, and CDMA, CDMA-2000 and UMB. It can be applied to resource allocation in the field of synchronous wireless communication.
  • the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
  • a wireless communication system to which an embodiment of the present invention is applied may support uplink and / or downlink HARQ, and may use a channel quality indicator (CQI) for link adaptation.
  • CQI channel quality indicator
  • multiple access schemes for downlink and uplink transmission may be different from each other. For example, downlink uses Orthogonal Frequency Division Multiple Access (OFDMA), and uplink uses Single Carrier-Frequency Division Multiple Access (SC-FDMA). ) Is the same as can be used.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • one radio or radio frame includes 10 subframes and one subframe includes two slots. ) May be included.
  • the basic unit of data transmission is a subframe unit, and downlink or uplink scheduling is performed on a subframe basis.
  • One slot may include a plurality of OFDM symbols in the time domain.
  • a subframe consists of two time slots, and each time slot may include seven or six OFDM symbols in the time domain.
  • a time-frequency region defined by one slot in the time domain and 12 subcarriers (or subcarriers) corresponding to 180 kHz in the frequency domain may be referred to as a resource block (RB).
  • RB resource block
  • the transmission time of a frame is divided into TTIs (transmission time intervals) of 1.0 ms duration.
  • TTIs transmission time intervals
  • sub-frame may be used in the same sense, and the frame is 10 ms long and includes 10 TTIs.
  • the TTI is a basic transmission unit, where one TTI includes two time-slots of equal length, each time-slot having a duration of 0.5 ms.
  • the time-slot includes seven (or six) long blocks (LB) for the symbol. LBs are separated by cyclic prefixes (CP).
  • CP cyclic prefixes
  • Each TTI or subframe is divided into 14 (or 12) symbols (axis) in the time domain.
  • Each symbol (axis) may carry one symbol.
  • the total system bandwidth of 20 MHz is divided or divided into subcarriers of different frequencies, for example, divided into 12 consecutive subcarriers corresponding to 180 kHz.
  • a bandwidth of 10 MHz in one slot may include 50 RBs in the frequency domain.
  • Each grid space of the time-frequency domain which is composed of each symbol in the time domain and each subcarrier in the frequency domain, may be referred to as a resource element (hereinafter, referred to as a "RE").
  • a resource element hereinafter, referred to as a "RE"
  • a total of 14 ⁇ 12 168 (or 12 ⁇ 12)
  • Reference Signal RSs Reference Signals
  • CRS Cell-specific Reference Signals
  • MBSFN-RS Multicast / Broadcast over Single Frequency Network Reference
  • UE-specific Reference Signal UE-specific Reference Signal
  • CRS is a reference signal for unicast transmission, not MBSFN transmission, and should be included in all downlink subframes in a cell that does not support MBSFN transmission. In addition, it must be transmitted on one or multiple of antenna ports 0-3.
  • one reference signal is transmitted for each downlink antenna port, and an RE used for CRS transmission of one of the antenna ports in the slot cannot be used for another antenna port in the same slot.
  • REs to which CRSs for each antenna port are allocated have a period of 6 for subcarriers, which are expressed as follows.
  • CSI-RS can be newly defined to identify channel state information for up to eight antennas.
  • the CSI-RS which is currently discussed in LTE-A, has an antenna port in the region of 12 subcarriers corresponding to one resource block on the frequency axis every duty cycle on the time axis for each cell. As many as one RE is assigned.
  • the predetermined period corresponds to a multiple of 5ms of time consisting of five subframes (that is, 5ms or 10ms may be the predetermined period).
  • the CSI-RS is transmitted in a total of two subframes among 10 subframes in one radio frame corresponding to 10ms. Therefore, if only the CSI-RS pattern for one subframe is defined, the other subframe may be allocated with a certain period.
  • a certain period for the transmission of the CSI-RS is defined as a CSI-RS transmission cycle.
  • a communication system using up to 8 ⁇ 8 multiple input multiple output antennas (MIMO) has been discussed in both transmitting and receiving terminals, and since a different CSI-RS has to be transmitted for each antenna port, the transmitter has a total of eight antennas.
  • the CSI-RS for the port should be allocated to be distinguished in the time-frequency domain, and in particular, the CSI-RS needs to be allocated to be distinguished for each cell in a multi-cell environment.
  • the basic definition of the current CSI-RS and the overhead for each antenna port for one subframe are determined as described above, but specifically, the allocation and transmission method of the CSI-RS for each antenna / base station (cell) Is not determined.
  • 2 to 13 illustrate a representative example of CSI-RS mapping to one subframe, and includes a structure of a subframe (hereinafter referred to as FS) and a cyclic shift (CP). It illustrates a CSI-RS pattern that can be defined according to the normal or extended ('), and the number of antenna ports (one of two, four, eight).
  • FS subframe
  • CP cyclic shift
  • a CRS Carrier Sense Multiple Access
  • a control region As shown in FIG. 2, for one subframe, in the case of a normal subframe, a CRS, a control region, and a DM-RS (Demodulation Reference Signal) Rel-9 / 10, which are conventionally used among a total of 14 symbols, are used.
  • the CSI-RS may be allocated so as not to overlap with them.
  • an unshaded RE may allocate the CSI-RS.
  • 3 to 5 illustrate all possible CSI-RS patterns according to the number of antenna ports in the resource region as shown in FIG. 2, and each CSI-RS pattern is divided into alphabet subscripts.
  • antenna ports 0 to 7 may have a total of five CSI-RS patterns up to a patterns to e patterns.
  • numbers are numbers of respective antenna ports, and alphabet subscripts are identifiers indicating CSI-RS patterns or muting patterns.
  • the CSI-RS pattern when the number of CSI-RS antenna ports is two, four instead of eight, is configured in a nested structure when the number of CSI-RS antenna ports is eight.
  • the pattern when the number of CSI-RS antenna ports is four is composed of patterns divided within each specific pattern when the number of CSI-RS antenna ports is eight, so the total number of patterns is CSI-RS This is doubled when the number of antenna ports is eight.
  • the pattern when the number of CSI-RS antenna ports is two is also composed of the divided patterns within each specific pattern when the number of CSI-RS antenna ports is four, so the total number of patterns is the number of CSI-RS antenna ports. It is twice as many as four.
  • five CSI-RS patterns that are basically applied to the normal CP case in one subframe are five when the number of CSI-RS antenna ports is eight (see FIG. 3. a to e), and 10 times that of twice the number of CSI-RS antenna ports (a to j of FIG. 4) when the number of CSI-RS antenna ports is 4, and 20 kinds to which the number of CSI-RS antenna ports is 2 (a to t of FIG. )
  • 6 to 9 generally apply to both FS1 and FS2 (except for special subframes), and show a CSI-RS pattern in the case of an extended CP.
  • the CSI-RS can be allocated with resources, and an unshaded RE is an area in which the CSI-RS can be allocated.
  • FIG. 7 to 9 illustrate all possible CSI-RS patterns according to the number of antenna ports in the resource region as shown in FIG. 6, and each CSI-RS pattern is divided into alphabet subscripts.
  • the antenna ports may have a total of four CSI-RS patterns up to a patterns to d patterns.
  • four CSI-RS patterns applied to the extended CP case in one subframe are four when the number of CSI-RS antenna ports is eight (a to FIG. 7).
  • d which is twice that of the number of four CSI-RS antenna ports (eight a to h in FIG. 4), and sixteen (a to p of FIG. 5) when the number of CSI-RS antenna ports is two; do.
  • FIGS. 10 to 13 show examples of a CSI-RS pattern applied as an additional option in the case of FS2.
  • FIGS. 10 and 11 show normal CPs
  • FIGS. 12 and 13 show extended CPs.
  • FIG. 10 illustrates a resource region capable of allocating a CSI-RS in case of an additional option of FS2.
  • CRS CRS
  • control region control region
  • DM-RS Rel-9 DM-RS Rel-9
  • the CSI-RS may be allocated to the resource so as not to overlap them.
  • the unshaded RE is the CSI-RS. This is the area that can be allocated.
  • FIG. 11 illustrates all CSI-RS patterns that can be used when the number of antenna ports is 8 in the resource region as shown in FIG. 10 and may have a total of three CSI-RS patterns, ranging from a to c patterns.
  • two and four antenna ports when the number of CSI-RS antenna ports is four, six times that is twice, when the number of CSI-RS antenna ports is two It may have 12 CSI-RS patterns.
  • FIG. 12 illustrates a resource region capable of allocating a CSI-RS in the case of an additional option of FS2.
  • a conventional CRS, a control region, and a DM-RS are used.
  • the CSI-RS may be allocated so as not to overlap with them.
  • the unshaded RE may allocate the CSI-RS.
  • FIG. 13 illustrates all possible CSI-RS patterns when the number of antenna ports is 8 in the resource region as shown in FIG. 12 and may have a total of seven CSI-RS patterns ranging from a to g patterns. .
  • two and four antenna ports according to the same principle as described above, when the number of four CSI-RS antenna ports is four times 14, and the number of two CSI-RS antenna ports two There can be a total of 28 CSI-RS patterns.
  • a plurality of CSI-RS patterns may be defined according to whether general or additional, normal or extended CP, and the number of antenna ports (one of 2, 4, and 8).
  • a set is defined as a CSI-RS pattern group or a muting pattern group, and one specific CSI-RS pattern actually adopted within the group is called a CSI-RS pattern or muting pattern ( muting pattern).
  • Each CSI-RS pattern of the branch may be a CSI-RS pattern group or a muting pattern group, and the actual CSI-RS allocation or the number of CSI-RS antenna ports is 2, 4, or 8 according to the number of CSI-RS antenna ports.
  • One pattern specified for muting may be defined as a CSI-RS pattern or a muting pattern.
  • FIG. 14 illustrates a multi-cell environment, such as a Cooperative MultiPoint Tx / Rx System (hereinafter referred to as CoMP).
  • CoMP Cooperative MultiPoint Tx / Rx System
  • the multi-cell environment to which the present invention may be applied includes, but is not limited to, CoMP, and it should be understood that a single terminal includes all cases in which a CSI-RS should be received from two or more cells or base stations.
  • the UE receives information from one or more base stations or cells simultaneously, and the neighboring cell as well as the serving cell to which the corresponding user is currently transmitting and receiving.
  • the CSI-RS of the neighbor cell has a weaker reception power than that of the serving cell, when the CSI-RS is simultaneously transmitted in the same time / frequency resource in the serving cell and the neighbor cell, or in the serving cell Transmits data and neighbor cells transmit CSI-RS, the user is difficult to properly detect the CSI-RS from the neighbor cell.
  • each cell has one of the patterns defined in FIGS. 2 to 13 as a CSI-RS pattern.
  • each cell transmits the CSI-RS in one of five patterns as shown in FIG. Done. That is, Cell A is the first of five patterns, Cell B is the second of five patterns, and Cell C is the fourth of five patterns. Information about this pattern may be determined implicitly based on Cell ID, and may be determined explicitly by scheduling and signaling of an upper end for each base station.
  • Cell A transmits CSI-RS in the region corresponding to the first pattern, which is the CSI-RS pattern for Cell A, out of five patterns, and CSI-RS for other cells.
  • Data is transmitted for the second, third, fourth, and fifth patterns, which are patterns.
  • the UE knows that the CSI-RS for Cell A is transmitted in the region corresponding to the first pattern of information received from Cell A, which is the base station, and decodes the other 2, 3, 4, When the data corresponding to the fifth pattern is transmitted, the data is decoded.
  • the resource region corresponding to the second pattern receives not only data but also CSI-RS from Cell B.
  • CSI-RS is transmitted at higher transmission power than Cell A
  • Cell A is closer to UE.
  • CSI-RS information from Cell B which is farther away, may be subject to severe interference due to data information coming from it. Therefore, in order for the UE in Cell A to properly receive CSI-RS information from Cell B without interference, Cell A transmits at zero power without transmitting data for the resource region where Cell B transmits CSI-RS. (muting) can be performed.
  • the UE in Cell A receives data from the cell A rather than data from the cell A for the resource region where the cell B transmits the CSI-RS, and the CSI-RS comes from the cell B. Know and decode it.
  • CSI-RS pattern when a CSI-RS pattern is configured for each cell in consideration of a multi-cell environment such as CoMP, CSI according to the CSI-RS pattern in neighboring cells forming a CoMP set to reduce the influence of interference with neighboring cells. For the part where -RS is to be configured, it is possible to perform muting that transmits at zero power without sending data.
  • the serving cell As seen from the perspective of Cell A, the serving cell, as shown in FIG. 14, previously known information of Cell A to the UE in Cell A includes CSI-RS pattern, CSI-RS antenna port number, CSI-RS transmission cycle, It may be a transmission offset.
  • the UE in Cell A which is the serving cell, does not know about the information related to the CSI-RS of neighbor cells.
  • the UE in Cell A serving cell has data for the resource region in which the CSI-RS pattern is configured in the neighbor cell. Since you don't know whether you are transmitting or muting at zero power, you may have problems decoding.
  • the present embodiment applies a technique of transmitting information on whether or not to mute a CSI-RS resource region in which a CSI-RS pattern of a neighboring cell capable of configuring each cell, that is, muting information, to the terminal. .
  • the simplest method is to mute all the parts of the CSI-RS pattern of the adjacent cells, which are possible through 1-bit signaling (may be higher-end signaling through RRC or the like, or PDCCH signaling). It tells you whether to send data without muting.
  • each cell when each cell configures eight CSI-RS antenna ports in the general CSI-RS pattern of the normal CP, each cell will be configured in one of the five patterns shown in FIG.
  • muting is a waste of resources since there may be more areas where data is not sent in order to reduce interference with neighboring cells in a multi-cell environment. If data is sent without muting all), there is an interference problem with neighboring cells. Therefore, it is efficient to mute only necessary partial regions rather than muting all possible CSI-RS patterns, and the base station needs to signal information about what the partial region is to the UE.
  • the base station signals to each UE which part of the part where the CSI-RS in the neighbor cell is to be configured for muting for zero-power transmission without sending data.
  • the muting area signaled may be all or part of a part of the CSI-RS of all possible neighboring cells, the CSI-RS pattern of neighboring cells constituting the CoMP set, and the CSI-RS antenna of each neighboring cell. It is configured in consideration of the number of ports, muting period (period or cycle), and offset in time / frequency.
  • the muting information transmission method includes at least one of CSI-RS pattern, number of CSI-RS antenna ports, CSI-RS transmission period, CSI-RS transmission subframe offset information from an adjacent cell.
  • Receiving neighboring cell information determining a muting region that is a time / frequency region that requires muting by overlapping with the CSI-RS of the neighboring cell based on the neighboring cell information, and indicating the muting region, wherein the muting subframe Generating muting information including a first data field indicating a muting period and a muting offset of the second data field; and a second data field indicating one or more of a muting pattern group and a specific muting pattern in the muting subframe; It may be configured to include the step of transmitting to the terminal.
  • Generating the muting information may further include a first step of determining a muting period and a muting offset and generating a first data field indicating the muting period, and indicating one or more of a muting pattern group and a specific muting pattern in one muting subframe. It may be configured to include a second step of generating a second data field.
  • the first step may be determined according to a relationship between the position of the muting subframe requiring muting and the CSI-RS transmission period and the CSI-RS transmission offset of the specific cell or the neighboring cell. It demonstrates in detail.
  • the muting information according to the present embodiment may have a separate value for each adjacent cell or have a single unified value, a first data field indicating a muting period and a muting offset, and a muting pattern in one muting subframe. It may include a second data field indicating one or more of the group and the specific muting pattern.
  • 15 is a flowchart illustrating a method of transmitting CSI-RS muting information according to the present embodiment.
  • the CSI-RS muting information transmission method according to the present embodiment is performed by a serving cell or a serving base station currently providing a service to a terminal in a multi-cell environment, but is not limited thereto.
  • a neighbor including at least one of a CSI-RS pattern, the number of CSI-RS antenna ports, a CSI-RS transmission period, and CSI-RS transmission subframe offset information from an adjacent cell.
  • Receiving cell information (S1505), Determining a muting area that is a time / frequency area that requires muting by overlapping with the CSI-RS of the neighboring cell based on the received neighbor cell information (S1510),
  • the muting Generating muting information including a first data field indicating an area and indicating a muting period and a muting offset of the muting subframe, and a second data field indicating one or more of a muting pattern group and a specific muting pattern in one muting subframe It may be configured to include a step (S1515), and a step (S1520) for transmitting the generated muting information to the terminal.
  • the CSI-RS transmission method considers the determined muting area when resource element mapping is performed on a physical downlink resource channel (PDSCH) for data transmission, and transmits data to the muting area.
  • the method may further include performing a resource mapping including a muting process of transmitting zero power without transmitting and transmitting the resource mapping to the terminal (S1525).
  • the step S1525 may be configured after the step S1520 for transmitting the muting information to the terminal, or may be configured after the step S1510 for determining the muting area or after step S1515 for generating the muting information.
  • step S1505 the CSI-RS pattern, the number of CSI-RS antenna ports, the CSI-RS transmission subframe offset, and the CSI-RS transmission period in one subframe configured in each neighboring base station from the neighboring base station to which the corresponding base station is muting.
  • Adjacent cell information including information on one or more of the transmission is received.
  • the neighboring base station (cell) to be muted may be a neighboring base station (cell) having all other CSI-RS patterns, and as shown in FIG. 14, a CoMP set excluding a serving cell (Cell A in FIG. 14).
  • Some neighboring base stations (Cell B and Cell C in FIG. 14) may be formed, or one or more neighboring base stations (Cells) to be subjected to other muting.
  • step S1505 information is transmitted between the base station cell and the base station cell, and information transmission through the X2 interface may be an example, but is not limited thereto.
  • a serving cell allocates a resource space (PDSCH) for data transmission
  • interference may occur in an area to which a CSI-RS of an adjacent cell is allocated, thereby transmitting an area with zero power without transmitting data.
  • the muting information means information used for designating the area.
  • 16 is a flowchart of a detailed configuration of generating muting information in the present embodiment.
  • the muting information generation step S1515 of FIG. 15 includes a first step S1605 of determining a muting period and a muting offset and generating a first data field indicating the muting period, a muting pattern group and a specific muting in one muting subframe. And a second step S1610 of generating a second data field representing one or more of the patterns.
  • the base station corresponding to the serving cell configures muting information indicating a muting area for transmitting zero power without transmitting data in two stages, and the first stage of the two stages may be performed for the first time, but the second stage After the process, the information may be finally configured.
  • the information configured through the first and second steps is signaled to the UE, and the corresponding cell is a subframe corresponding to the muting offset for each muting period based on the muting information. In the muting pattern from each adjacent cell in the cell, muting is performed at zero power without sending data.
  • the muting-related information to be transmitted or signaled to the terminal may be transmitted through higher level signaling such as RRC or may be dynamically transmitted through the PDCCH.
  • the terminal in the serving cell decodes in consideration of the muting region (ie, the muted portion transmitting zero power without transmitting data) found through the signaled muting information. If the UE does not know whether data is coming into the PDSCH region, or if muting is transmitted with zero power without data (in this time / frequency resource region, whether the CSI-RS from the adjacent cell is transmitted without data). In the case of decoding), an error or quality deterioration may occur in decoding, but this problem does not occur when decoding in consideration of the aforementioned muting information.
  • the first step is to specify the subframe to be muted in consideration of the CSI-RS related information of each corresponding neighboring cell to be muted, and configures the information through a muting period and a muting offset. In each muting period, muting is performed in a subframe represented by a corresponding muting offset.
  • This information may be transmitted as the same for each corresponding neighboring cell that is the subject of all muting (in this case, only one is transmitted because the muting information is the same for the neighboring cells that are the subject of all muting), and for each muting target A plurality of neighbor cells may be transmitted. (In this case, since the muting information may be different with respect to neighbor cells which are all the muting targets, the number of neighboring cells that are the muting targets may be transmitted.)
  • This first step may be further divided into five cases according to how the muting period and the muting offset are related to the CSI-RS transmission period and the CSI-RS transmission offset of the serving cell. To 5).
  • the first step is a CSI-RS transmission period and a CSI-RS of a serving cell or a neighboring cell in which a subframe (that is, a muting subframe) requiring muting among the CSI-RSs of the serving cell is considered in consideration of interference with the neighboring cell.
  • a subframe that is, a muting subframe
  • the transmission offset can be differently implemented differently.
  • Muting duty cycle and muting offset are the same as the CSI-RS transmission cycle and CSI-RS transmission offset of the serving cell (base station) (the muting period and muting offset are the same for all neighboring cells to be muted) Case, and the information configured below is transmitted to the same one for all neighboring cells to be muted)
  • the number of information bits constituting the first data field may be 0 bits.
  • the subframe in which the serving cell transmits the CSI-RS is determined to be a subframe to be muted.
  • the CSI-RS transmission period of the serving cell is 10ms and the transmission offset is 3, the CSI-RS is transmitted in a fourth subframe (subframe number 3), and the fourth subframe is a muting target. Since this is a subframe, no additional information is needed to designate a subframe in which the CSI-RS of the neighbor cell is transmitted.
  • the muting offset is the same as the CSI-RS transmission offset of the serving cell, and the muting period is a multiple of the CSI-RS transmission period of the serving cell (the muting period and the muting offset are the same for all neighboring cells to be muted).
  • the information configured below is based on the same transmission for all neighboring cells to be muted, but for more accurate muting, the muting offset is the same for all neighboring cells to be muted, but the muting period is Each neighboring cell may be different from each other, and the information configured below may be configured and transmitted separately for each corresponding neighboring cell to be muted.
  • the number of information bits constituting the first data field is 2 bits, 4 bits, 8 bits,... , 2 M bits (M is a natural number). Also in addition You might need a bit, The bit may not be transmitted.
  • M may be a natural number, and M may be determined to be equal to or greater than a maximum multiple of the muting period for the CSI-RS transmission period.
  • the first data field may consist of one of 2, 4, 8, and 16 bits, and indicates the number of configuration bits. To further Bits may be needed.
  • a bit map may be 0 or 1 for each bit of information bits consisting of 2 bits, 4 bits, 8 bits, or 16 bits, and each bit may be a bit map of the serving cell. It corresponds to one CSI-RS transmission period.
  • the bit value may be muted if 0, and data may be transmitted if 1 (eg, data transmission when 0). May be configured as muting when 1).
  • M 4
  • the number of bits separately signaled or additionally included is 2 bits. If the bit value is '00', the configured number of information bits is 2 bits, and if '01' is 4 bits, '10''Bit' is 8 bits, '11' is 16 bits.
  • the subframe corresponding to the CSI-RS transmission offset in the CSI-RS transmission period of the serving cell is muted only when the bit value is 0 for each bit value of the information bits constituting the first data field. It is determined as a subframe that is a target of.
  • the serving cell has a CSI-RS transmission period of 10 ms and an offset of 3, the CSI-RS is transmitted in a fourth subframe (subframe number 3), wherein the number of configured information bits is 4 bits. If 0101, muting is performed only within the first and third transmission periods of four transmission periods of 40ms in total, and the fourth subframe within each transmission period is the subframe to be muted. .
  • It defines a specific period which is a multiple of the CSI-RS transmission period of the serving cell and an offset within a specific period, and muting is performed only for the CSI-RS transmission period of the serving cell corresponding to the offset within this period.
  • the specific period is determined by a value corresponding to 2 times, 4 times, 8 times, and 16 times the CSI-RS transmission period of the serving cell, and 2 times, 4 times when the time is doubled. It is composed of 30 cases, 4 kinds of double, 8 kinds of 8 times, and 16 kinds of 16 times.
  • the total number of bits is 5 bits.
  • the 5-bit bit value is 0 to 1
  • two offsets are provided when the serving cell is twice the CSI-RS transmission period, and when the bits are 2 to 5, 4 times the CSI-RS transmission period of the serving cell.
  • 4 offsets, double offset 8 to 8 times the serving cell's CSI-RS transmission cycle, and 14 to 29 offset 16 times the CSI-RS transmission cycle of the serving cell 16 offsets are expressed.
  • Muting is performed only for the CSI-RS transmission period of the serving cell corresponding to the offset within the specific period, and muting is not performed for the rest. That is, the subframe corresponding to the CSI-RS transmission offset in the CSI-RS transmission period of the serving cell represented by the specific period and the offset is determined as the subframe to be muted.
  • the serving cell has a CSI-RS transmission duty cycle of 10 ms and an offset of 3
  • the CSI-RS is transmitted in a fourth subframe (subframe number 3)
  • the configured information bits are 5 Bit 01010 (bit value is 10, which corresponds to 8 times a specific period and an offset of 5)
  • 5 out of 8 duty cycles where the serving cell's CSI-RS transmit duty cycle is 80 ms, which is 8 times 10 ms. Muting is performed only within the fourth duty cycle, and the fourth subframe within the duty cycle becomes the subframe to be muted.
  • the muting offset is the same as the CSI-RS transmission offset of the serving cell, it is not transmitted. Since the muting period is a multiple of the CSI-RS transmission period of the serving cell, only this is transmitted. For example, if the muting cycle (duty cycle) is 1 times, 2 times, 4 times, 8 times, 16 times the CSI-RS transmission cycle of the serving cell, these five cases are configured by 3 bits and transmitted. (In the above, five types of multiple values are given, but the configuration and number of the multiple values may be different. For example, four types of 1, 2, 4, and 8 times can be configured as 2 bits. It is possible to configure up to 8 multiples more than the above five values in each type and transmit them in 3 bits).
  • the serving cell has a CSI-RS transmission period of 10 ms and an offset of If 3, the CSI-RS is transmitted in the fourth subframe (subframe number 3), wherein the configured information bits are 3 bits and 010 (bit value is 2, 000 is 1 time, 001 is 2 times, If 010 is configured as 4 times,..., this means that 4 times the serving cell period is a muting period), 40 ms, which is 4 times 10 ms, which is the CSI-RS transmission period of the serving cell, becomes the muting period.
  • the frame offset is equal to 3 equal to the subframe offset of the serving cell.
  • the muting offset is the same as the CSI-RS transmission offset of the serving cell (base station), but the muting period may differ from the CSI-RS transmission period of the serving cell (base station) (the muting offset is all adjacent to the muting target)
  • the muting periods may be different, and the information configured below is based on the fact that each muting signal is transmitted separately for each corresponding neighboring cell, but the total number of bits for muting signaling
  • the muting period and the muting offset may be the same for all neighbor cells to be muted, and the information configured below may be transmitted as the same for all neighbor cells to be muted.
  • the number of information bits constituted by the first data field is' 2 or 3 bits (duty cycle) determined according to the number of adjacent cells (N) x muting periods of each muting target. If there are four or less types of 2 bits, and if there are more types of duty cycles, the number of duty cycles may be 3 bits or less), and the muting period is determined according to the configured information bit value.
  • the muting offset is determined based on a modular value of the CSI-RS of the serving cell (base station) as the muting period, and muting is performed from a subframe corresponding to the muting offset in the muting period for each adjacent cell that is the target of each muting.
  • the subframe to be determined is determined.
  • configured information bits may be configured separately for each corresponding neighboring cell to be muted.
  • the muting period is 5ms when '00', the muting period is 10ms when '01', and the muting period when '10'. If 20ms or '11', the muting period can be configured to 40ms. At this time, if the configured bit value is '10', the muting period is 20ms.
  • the fourth subframe (subframe number 3) is the subframe to be muted every 20ms.
  • the number of information bits constituted by the first data field is 'the number of adjacent cells (N) x 2 bits (or 4 bits, 8 bits, ..., 2 M bits) of each muting target', and optionally 'N ⁇ Bit 'may be additionally included. However, 'N ⁇ Bit 'may not be transmitted.
  • a bit map is 0 or 1 for each bit of information bits consisting of 2 bits, 4 bits, 8 bits, or 16 bits. Accordingly, each bit corresponds to 5ms (or 10ms), which is the smallest value of the duty cycle. That is, for a subframe corresponding to the value of Modular 5 (or 10) of the CSI-RS transmission offset of the serving cell (base station) every 5 ms (or 10 ms), the bit value is muted if 0, and the data is muted without muting. It is a method of transmitting a (conversely, data may be transmitted when 0 and muting when 1).
  • the number of bits that can be signaled separately is 2 bits. If the bit value is '00', the configured information bits are 2 bits, 4 bits if '01', and 8 if '10'. Bit, '11' is equivalent to 16 bits. In this case, the information bits configured as the first data field may be configured separately for each corresponding neighboring cell to be muted.
  • the CSI-RS transmission offset of the serving cell is modular 5 (or 10) for each muting period corresponding to 5 ms (or 10 ms) only when the bit value is 0.
  • the subframe corresponding to the value is determined as the subframe to be muted.
  • the CSI-RS transmission offset of the serving cell (base station) is 8 (CSI-RS transmission period is 10ms)
  • the fourth subframe corresponding to 3 corresponding to the modular 5 value (subframe number 3). ) Is the same as the subframe to be muted.
  • the muting period is the same as the CSI-RS transmission period of the serving cell (base station), but the muting offset may be different from the CSI-RS transmission offset of the serving cell (base station) (the muting period is all adjacent to the muting target) It is the same for the cell, but the muting offset may be different, and the information configured below is transmitted separately for each corresponding neighboring cell that is subject to all muting)
  • the number of information bits constituted by the first data field is' the number of adjacent cells (N) x 2 to 4 bits' to be muted. '
  • the CSI-RS of the serving cell determines the muting period of the transmission period, and the muting offset is determined by the bit value received in each muting period. For example, when the muting period is 5ms, the remaining four subframes except the subframe through which the PSS / SSS is transmitted are represented by 2-bit information, and the muting offset is determined from this value. If the muting period is 10ms, the remaining eight subframes except the subframe through which the PSS / SSS is transmitted are represented by 3-bit information, and when the muting period is 20ms, the remaining 16 subframes except the subframe through which the PSS / SSS is transmitted The frame is represented by four bits of information. The subframes to be muted are determined from subframes corresponding to the muting offsets in the muting period for each corresponding neighboring cell to be muted.
  • the configured information bits may be configured separately for each corresponding neighboring cell to be muted.
  • the number of information bits of the characteristic cell to be muted is 3 bits, and the fifth subframe excluding the PSS / SSS whose value is '010' is determined as the muting offset.
  • the fifth subframe (subframe number 4) becomes the subframe to be muted every 10 ms.
  • the muting period and muting offset may be different from the CSI-RS transmission period and transmission offset of the serving cell (base station) (the muting period and muting offset may be different for each corresponding neighboring cell targeted for all muting).
  • the information configured below is transmitted separately for each corresponding neighboring cell that is subject to all muting)
  • the number of information bits constituted by the first data field is' the number of adjacent cells (N) ⁇ It becomes a configuration.
  • the period is 5 ms and its subframe offset is 4, and if it is 4 to 11, the period is 10 ms and its subframe offset is 8, 12 to In the case of 27, when the period is 20ms and 16 subframe offsets are represented.
  • M 4
  • 8, 16 and 32 subframe offsets except PSS / SSS are composed of 60 cases in total for 4 cycles of 5ms, 10ms, 20ms and 40ms. The total number of bits is 6 bits.
  • the period is 5ms and 4 subframe offsets. If 4 ⁇ 11, the period is 10ms and 8 subframe offsets, 12 ⁇ 27. In the case of 20ms and 16 subframe offsets, and in the case of 28 to 59, the periods are 40ms and 32 subframe offsets.
  • the subframes to be muted are determined from subframes corresponding to the muting offsets in the muting period for each corresponding neighboring cell to be muted.
  • configured information bits may be configured separately for each corresponding neighboring cell to be muted.
  • the muting period is 20ms and the muting offset is 1 (12 to 27).
  • 16 subframe offsets are expressed when the period is 20ms, i.e., the offset is 0 when 12 and the offset is 1 when 13). Therefore, 2 except PSS / SSS every 20ms for the corresponding cell.
  • the first subframe (subframe number 2, subframe number 0 is the subframe to which the PSS / SSS is mapped) is the same as the subframe to be muted.
  • the subframes to be muted are determined from subframes corresponding to the muting offsets in the muting period for each corresponding neighboring cell to be muted.
  • each of the methods mentioned is not selected and applied separately in each case, but only one is selected and applied according to the system configuration and standardized method for CSI-RS, and each case may include a different case (eg For example, method 5 may be regarded as a generalized case including other methods).
  • the second-first method of configuring the second data field to directly display information on a specific muting pattern without information on the muting pattern group, and the second data field to indicate only the muting pattern group The 2-1 scheme may be divided into the 2-2 scheme, and the 2-1 scheme to display only a specific muting pattern may be subdivided into one of the A, B, and C schemes.
  • the present invention is not limited to this division scheme, and may include all manners of configuring the second data field to represent one or more of a muting pattern group and a specific muting pattern so as to indicate a muting region in a muting subframe. .
  • Method 2-1 configure the second data field to represent only the muting pattern
  • the muting pattern is immediately recognized without identifying the muting pattern group.
  • the muting pattern group is a pattern group composed of eight REs, such as when the CSI-RS antenna port is eight among the CSI-RS patterns.
  • the muting pattern group is also one of five.
  • the muting pattern group is one of four.
  • CSI-RS For CSI-RS applied as an additional option in FS2 (TDD) as shown in FIGS. 11 and 13, when the number of CSI-RS antenna ports is 8 for one subframe for a normal CP, a total of 3 Muting pattern group is also one of three because CSI-RS patterns are defined, and muting pattern group is defined because a total of seven CSI-RS patterns are defined when eight CSI-RS antenna ports are defined for one subframe in an extended CP. One of seven.
  • Method of directly displaying the muting pattern 1 Method of configuring 5-6 bits for each adjacent cell that is the target of each muting
  • the number of information bits constituting the second data field may be the number N of adjacent cells to be subjected to 5-bit or 6-bit muting to indicate each of the muting patterns.
  • the CSI-RS is applied to both FS1 (FDD) and FS2 (TDD) by default, and the number of CSI-RS antenna ports is 8 for one subframe as shown in FIG. 3.
  • the total number of muting patterns is 5 for 8 antenna ports, 10 for 4 antenna ports, and 20 for 2 antenna ports.
  • the second data field may be configured to represent a total of 35 muting patterns with 6 bits.
  • bit values 0 to 63 represented by 6 bits
  • 15 to 34 bit values represent 20 muting patterns in the case of two antenna ports
  • the remaining bit values 35 to 63 are reserved.
  • the second data field may be configured to represent a total of 28 muting patterns with 5 bits.
  • bit values 0 to 31 represented by 5 bits
  • 4 antenna ports when the bit values are 4 to 11 8 muting patterns in case of 8
  • the second data field may be configured to represent a total of 19 muting patterns with 5 bits.
  • the second data field may be configured to represent 49 muting patterns in total by 6 bits in the same manner as described above. These second data fields may be configured differently for each adjacent cell to be muted.
  • the muting information is configured and transmitted by dividing the case where it is basically applied to FS1 and FS2 and the case where it is additionally applied only to FS2, but for convenience, the two cases may be combined and transmitted at the same time.
  • 56 types of 6 bits may be transmitted by combining a total of 35 cases that are basically applied to FS1 and FS2 and 21 cases that are additionally applied to FS2.
  • muting information may be configured with 6 bits.
  • the pattern of the case where it is additionally applied only to the FS2 includes the pattern of the case that is basically applied to the FS1 and the FS2.
  • the muting information may be configured with bits.
  • the number of information bits constituting the second data field may be '5 bits x the number N of adjacent cells to be muted'.
  • this CSI-RS pattern for the eight antenna ports cannot be the CSI-RS pattern of the neighboring cell to be muted. Therefore, among the total 35, 7 types included in the CSI-RS pattern of this serving cell (the pattern included in the CSI-RS pattern of the corresponding serving cell when 8 antenna ports are 1 pattern when 8 antenna ports are included, and the antenna 2 patterns for 4 ports and 4 patterns for 2 antenna ports, and the total number of patterns is 7)) cannot be the CSI-RS pattern of an adjacent cell to be muted.
  • the second data field may be configured to represent the remaining 28 muting patterns by dividing them into 5 bits.
  • the serving cell transmits the CSI-RS to four antenna ports
  • the CSI-RS pattern for the four antenna ports cannot be the CSI-RS pattern of the neighboring cell to be muted. Therefore, four out of 35 CSI-RS patterns of this serving cell are included or included (the pattern included by the CSI-RS pattern of the serving cell in case of four antenna ports is one in case of four antenna ports. And two patterns in the case of two antenna ports, and a pattern including the CSI-RS pattern of the corresponding serving cell in the case of four antenna ports is one pattern including the eight antenna ports. Therefore, the sum of the total number of patterns is four), and the second data field is configured to be divided into 5 bits for the remaining 31 muting patterns, and cannot be the CSI-RS pattern of the adjacent cell to be muted. can do.
  • this CSI-RS pattern for the two antenna ports cannot be the CSI-RS pattern of the neighboring cell to be muted. Accordingly, among the 35 types, three patterns including the CSI-RS pattern of the serving cell (the pattern included by the CSI-RS pattern of the corresponding serving cell when two antenna ports are two are one pattern when two antenna ports are included).
  • the pattern including the CSI-RS pattern of the corresponding serving cell in the case of two antenna ports is one pattern including the one of eight antenna ports and one pattern including four of the antenna ports Therefore, the total number of patterns in total is 3), which cannot be the CSI-RS pattern of the adjacent cell to be muted, and the second data field is divided into 5 bits for the remaining 32 muting patterns. Can be configured.
  • CSI-RS in the case of extended CP which is basically applied to both FS1 (FDD) and FS2 (TDD)
  • FDD frequency division duplex
  • FS2 FS2
  • CSI-RS patterns are defined.
  • the second data field may be configured to represent 25 of the total 28 except for three by 5 bits, but the method A described above Likewise, you can organize information using just 28 bits of 5 bits.
  • This configuration excludes the case of the CSI-RS configuration applied as the additional option of FIGS. 10 to 13.
  • the second data field is configured for each adjacent cell to be muted.
  • the information bit number constituting the second data field may be configured as one bit value of '12 to 28 bits in total '.
  • FS1 FDD
  • FS2 TDD
  • CSI-RS CSI-RS in the case of normal CP
  • the number of CSI-RS antenna ports is 8 for one subframe as shown in FIG. -RS patterns are defined, in which case there are 20 CSI-RS patterns when there are two antenna ports.
  • bitmap When the bitmap is configured with 20 bits, information about an RE to be muted in one subframe can be configured regardless of the number of adjacent cells that are to be muted.
  • muting is performed when bitmap information is 0 and data is sent when 1 is transmitted to each of 20 patterns of two antenna ports composed of two REs. If it is 1, you can mute). If the number of CSI-RS antenna ports of the neighboring cells to be muted is 8, the number of 4 CSI-RS antenna ports is composed of 2, so all of the bitmap values for the 4 are set to 0. Expression In addition, if the number of CSI-RS antenna ports of the adjacent cells to be muted is four, the number of two CSI-RS antenna ports is two. Expression
  • CSI-RS For CSI-RS in the case of the extended CP, which is basically applied to both FS1 (FDD) and FS2 (TDD), if the number of CSI-RS antenna ports is 8 for one subframe as shown in FIG.
  • the CSI-RS pattern is defined. In this case, since the number of patterns for transmitting the CSI-RS to the two antenna ports is 16 in total, it can be configured as 16-bit bit map information in the same manner as described above.
  • CSI-RS applied as an additional option in the FS2 (TDD)
  • TDD a total of three CSI-RS patterns Is defined.
  • the total number of patterns for transmitting the CSI-RS to the two antenna ports is 12 kinds, it can be configured as 12-bit bit map information by the above method.
  • the CSI-RS applied as an additional option in the FS2 when the number of CSI-RS antenna ports is 8 for one subframe in the case of the extended CP, a total of seven CSI-RSs The pattern is defined. At this time, since the number of patterns for transmitting the CSI-RS to two antenna ports is 28 in total, it can be configured as 28-bit bit map information in the same manner as described above.
  • the muting information is configured and transmitted by dividing the case where it is basically applied to FS1 and FS2 and the case where it is additionally applied only to FS2, but for convenience, the two cases may be combined and transmitted at the same time. That is, in the case of a normal CP, 32 types may be transmitted by forming a 32-bit bitmap by adding 20 types that are basically applied to FS1 and FS2 and 12 cases that are additionally applied only to FS2. In this case, as mentioned in FS2, 32 are composed of 32-bit bitmaps, but in FS1, there are only patterns that are applied by default, so only 20 can be configured as 20-bit bitmaps. For system application, muting information can be composed of 32-bit bitmap by considering 32 kinds in FS1.
  • the pattern of the case where it is additionally applied only to the FS2 includes the pattern of the case of being basically applied to the FS1 and the FS2.
  • the muting information may be configured with a bitmap of bits.
  • Method 2-2 Configure the second data field to represent only the muting pattern group
  • the second data field is basically applied to both '3 to 7 bits' (FS1 (FDD) and FS2 (TDD) and is normal CP. Is 5 bits).
  • the method does not mute only a specific muting pattern in a muting pattern group according to the number of antenna ports, but mutes all REs in a predetermined muting pattern group.
  • the second data field may be configured with bit map information with 5 bits, and the number of neighboring cells to be muted. Regardless of this, it is possible to configure information about RE to be muted in one subframe. In other words, it consists of a 5-bit bitmap for each of the five patterns of 8 antenna ports consisting of 8 REs, muting if 0, and sending data when 1 (in contrast to 0). Send data and mute if 1).
  • each adjacent cell to be muted is muted because it is the same as 8 when the CSI-RS is sent to 2 and 4 antenna ports. Practically, much more becomes the area to be muted.
  • the muted RE area is increased, so there is a problem in that an area capable of transmitting data is reduced, but the overhead of configuring and signaling muting information is reduced.
  • the second data field may be configured using the 4-bit bit map information as described above.
  • the second data field may be configured using the 3 bit bit map information in the same manner as described above.
  • the second data field may be configured with the 7-bit bit map information as described above.
  • the reference muting pattern group is based on eight CSI-RS antenna ports. However, this may be based on four CSI-RS antenna ports.
  • the generated muting information may be transmitted through higher level signaling such as RRC, dynamically transmitted through the PDCCH of the L1 layer, and in some cases, may be signaled through the MAC of the L2 layer.
  • RRC higher level signaling
  • the muting area determination and muting information generation of this embodiment may be selectively adopted in one or more of the above-described cases depending on the specification of the communication system to which the present embodiment is applied.
  • one or more of the various ways of constructing the first and second stages may be combined to form the present invention.
  • the present invention does not adopt all the detailed methods of the first and second steps described above, but rather the specification of the communication system, the configuration of the CSI-RS, the CSI-RS pattern, the number of CSI-RS antenna ports, and the CSI.
  • One or more of the various methods of configuring the first and second stages may be combined according to the type of the -RS transmission period and the CSI-RS transmission subframe offset.
  • 17 is a flowchart illustrating a method of obtaining channel information at a terminal using muting information according to the present embodiment.
  • the method for acquiring channel information is to obtain channel information by receiving CSI-RS signals from two or more cells (base stations), which is generally performed in a terminal or a UE, but is not limited thereto.
  • the channel state acquisition method includes a first data field indicating a muting period and a muting offset from a serving cell among two or more cells, and a second indicating one or more of a muting pattern group and a specific muting pattern in one muting subframe.
  • Receiving muting information including a data field (S1705), Receiving a CSI-RS considering muting (S1710), and using the muting information in the resource space for data transmission of the serving cell Confirming the muting region of the cell and identifying the CSI-RS transmission region of the neighboring cell corresponding thereto (S1715), decoding or estimating the CSI-RS of the serving cell and the neighboring cell in consideration of the muting region; And obtaining the channel state (S1720).
  • step S1710 Receiving the CSI-RS in consideration of muting in step S1710, specifically, the neighbor corresponding to the area muted by the muting information in the CSI-RS of the serving cell and the resource space (PDSCH) for data transmission of the serving cell This means receiving the CSI-RS of the neighbor cell transmitted from the resource region of the cell.
  • PDSCH resource space
  • the muting information received from the serving cell in S1705 is information indicating an area in which data should not be superimposed with the CSI-RS of the neighbor cell, and may be composed of the first and second data fields described with reference to FIGS. 2 to 16. have.
  • steps S1705 and S1710 may be configured in some cases, or may be implemented in one.
  • the CSI-RS signal received from the serving cell and the neighboring cell is matched with a reference signal (CSI-RS of the serving cell) generated in the area allocated in the serving cell to transmit the CSI-RS or the serving cell so as to match the aforementioned muting information.
  • a reference signal (CSI-RS of a neighboring cell) generated in a resource region of neighboring cells corresponding to a region to which muting is applied in which no data is transmitted or zero power is transmitted in a resource space (PDSCH) for data transmission.
  • PDSCH resource space
  • the checking of the muting region in S1715 may include determining a muting period and a muting offset by using the first data field value of the received muting information to determine a subframe in which the muting region exists, and using the second data field value.
  • the method may include determining a muting pattern group or a specific muting pattern in the corresponding muting subframe, and determining a muting region using the determined muting pattern group or muting pattern group, but are not limited thereto.
  • the terminal decodes the data received from the serving cell in a manner such that the decoding of the RE, which is a muting region, is not taken into consideration when decoding.
  • the reference signal After decoding the CSI-RS of the neighbor cell received from the region corresponding to the muted resource region and the CSI-RS of the previously received serving cell, the reference signal may be decoded and the channel state may be measured therefrom. This not only improves the decoding efficiency of the CSI-RS, but also accurately decodes the CSI-RS of each cell by eliminating interference with the CSI-RS of adjacent cells, thereby enabling accurate channel estimation. .
  • FIG. 18 is a block diagram of a CSI-RS muting information transmission apparatus according to the present embodiment.
  • the CSI-RS muting information transmission apparatus is generally implemented in or coupled with a serving cell or a serving base station in a multi-cell environment, but is not limited thereto.
  • the CSI-RS muting information transmitting apparatus includes a CSI-RS pattern, the number of CSI-RS antenna ports, a CSI-RS duty cycle, and a CSI-RS transmission subframe from one or more adjacent cells in a multi-cell environment.
  • a neighbor cell information receiver 1810 that receives neighbor cell information including one or more of offset information, and a time required for muting by overlapping with the CSI-RS of the neighbor cell in its resource space based on the neighbor cell information /
  • a muting region determiner 1820 that determines a muting region, which is a frequency domain, a first data field indicating the muting region and a muting period and a muting offset, a muting pattern group and a specific muting pattern in one muting subframe
  • Muting information generation unit 1830 for generating muting information including a second data field indicating one or more, and muting information for transmitting the generated muting information to the UE (UE) receiving the CSI-RS It can comprise a portion (1840).
  • the neighbor cell information receiving unit 1810 may transmit a CSI-RS pattern and a CSI of each neighbor cell from neighbor cells (Cell B and Cell C of FIG. 14) that should transmit their CSI-RS to a specific UE in a multi-cell environment such as CoMP. -Receives a function of receiving one or more information among the number of RS antenna ports, CSI-RS transmission period, and CSI-RS transmission subframe offset information.
  • the muting region determiner 1820 performs a function of determining a muting region, which is a time / frequency region that requires muting by overlapping with the CSI-RS of the neighbor cell in its resource space based on the neighbor cell information received from the neighbor cell. do.
  • the muting information generator 1830 generates muting information that may indicate a muting area determined by the muting area determiner. More specifically, as described with reference to FIGS. 2 to 16, the muting information generation unit 1830 indicates a muting period and a muting offset.
  • the final muting information may be generated by generating and combining one data field, a second data field representing one or more of a muting pattern group and a specific muting pattern in one muting subframe.
  • the first and second data fields may be determined according to a combination of one or more of the first and second steps as described with reference to FIG. 16, and detailed descriptions thereof will be omitted to avoid duplication.
  • the second data field is configured to directly indicate a specific muting pattern, and is basically applied to both FS1 (FDD) and FS2 (TDD) and is a normal CP, and the CSI- of the adjacent cell.
  • FDD FS1
  • TDD FS2
  • CSI- of the adjacent cell Assume that the number of RS antenna ports is 8, and a total of 35 patterns (five antennas, five antennas, ten antennas, and 20 antennas) are represented by 6 bits.
  • pattern b in the case of total 6 bits and 8 antennas is a muting pattern and is expressed as 000001)
  • the muting information includes a first data field bit value of 6 bits and a second data field bit value of 6 bits, and may be configured as shown in FIG. 19.
  • FIG. 19 shows an example of a data format of muting information according to the present embodiment.
  • the muting information 1900 includes a first data field region 1910 consisting of six bits of 101010 and a second data field region consisting of six bits of 000001. And 1920.
  • the first data field value 101010 has a muting period of 40 ms, which is four times the CSI-RS transmission period (10 ms) of the serving cell, and indicates that there is a muting subframe within the second and fourth CSI-RS transmission periods. (Assuming 0 means muting ON and 1 means muting OFF.)
  • the muting offset is 3 according to the first stage condition, the fourth subframe (subframe number within the second and fourth CSI-RS transmission periods). 3) becomes a muting subframe.
  • the second data field value is 000001, it is basically applied to both FS1 (FDD) and FS2 (TDD), and in the case of normal CP, a total of 35 patterns (eight antennas, five antennas, four antennas, and ten antennas) are possible.
  • the number of CSI-RS antenna ports of the neighboring cells of the two 20 kinds corresponds to 8, and represents the pattern b which is the second pattern among the total 5 CSI-RS patterns of FIG. 3.
  • the patterns a to e of the eight antennas according to FIG. 3 are represented as 000000, 000001, 000010, 00011, 000100, and the patterns a to j of the four antennas according to FIG. 4 are designated as 000101, 000110, 000111, ..., etc. Assuming you want to display them in order)
  • muting information as shown in FIG. 19 considers only one neighboring cell, and when muting information is separately configured for each of two or more neighboring cells, muting information corresponding to the number N of neighboring cells may be generated.
  • FIG. 20 is a diagram illustrating a frame and resource space configuration indicating a state in which a CSI-RS of an actual serving cell is muted by the muting information of FIG. 19.
  • a fourth subframe (subframe number 3) becomes a muting subframe within the second and fourth CSI-RS transmission periods, and the resource space corresponds to pattern b of FIG. 3.
  • the REs (indicated by dark shades in FIG. 20) become muting regions, thereby muting the data without allocating the data to the region. This is shown in FIG.
  • 21 is a configuration diagram of a channel state obtaining apparatus using muting information according to the present embodiment.
  • the apparatus for acquiring channel information obtains channel information by receiving CSI-RS signals from two or more cells (base stations), which is generally implemented in a terminal or a UE or is configured in association with the same, but is limited thereto. It is not.
  • the channel state obtaining apparatus includes a first data field indicating a muting period and a muting offset from a serving cell among two or more cells, a second muting pattern group and one or more of a specific muting pattern in one muting subframe.
  • Muting information receiving unit 2110 for receiving muting information including data fields
  • CSI-RS receiving unit 2120 for receiving CSI-RS signals considering muting from the serving cell and neighboring cells
  • the muting information Muting area checking unit 2130 for checking a muting area in which the CSI-RS signal of the adjacent cell is transmitted while data is not input (or zero-powered data is received) in the resource space (PDSCH) for data transmission.
  • a channel state obtainer 2140 for decoding the CSI-RS signal to obtain a channel state in consideration of the muting region.
  • the muting information received from the serving cell is information indicating an area in which data should not be superimposed with the CSI-RS of the neighbor cell and may be composed of the first and second data fields described with reference to FIGS. 2 to 16.
  • the muting information receiver 2110 receives muting information generated and transmitted by the serving cell according to a combination of one or more of the above-described first to second steps, and the muting information is illustrated in FIG. 19 and the like. It may have the same form, but is not limited thereto.
  • the CSI-RS receiver 2120 functions to receive the CSI-RS signal from the serving cell and the neighbor cell, and the CSI-RS signal received from the serving cell and the neighbor cell is already transmitted from the serving cell in order to transmit the CSI-RS. Muting applied to zero power or zero data in the resource space (PDSCH) for data transmission of the serving cell so as to match the reference signal (CSI-RS of the serving cell) generated in the allocated region or the aforementioned muting information This is a reference signal (CSI-RS of a neighboring cell) generated in the resource region of neighboring cells.
  • the muting area checking unit 2130 performs a function of checking a muting area for the serving cell using the muting information received from the serving cell, and more specifically, using the first data field value of the received muting information. Determining a subframe in which the muting region exists by checking the muting period and the muting offset; determining a muting pattern group or a specific muting pattern in the muting subframe using the second data field value; The muting region may be determined using a muting pattern or a muting pattern group. However, the muting region may not be limited thereto. For example, the muting region may be identified according to the principles illustrated in FIGS. 19 and 20.
  • the channel state obtaining unit 2140 decodes the RE, which is a muting region, in a manner such as not considering the decoding when decoding the data received from the serving cell, and the muted resource region.
  • the CSI-RS of the neighbor cell received from the resource region of the neighbor cells corresponding to the CSI-RS of the previously received serving cell may be decoded to decode the reference signal, and then the channel state may be measured therefrom.
  • This not only improves the decoding efficiency of the CSI-RS, but also accurately decodes the CSI-RS of each cell by eliminating interference with the CSI-RS of adjacent cells, thereby enabling accurate channel estimation. .
  • the serving cell in the multi-cell environment, the serving cell generates and transmits a CSI-RS muting the region overlapping with the CSI-RS of the adjacent cell, thereby enabling accurate CSI-RS decoding, thereby accurately performing channel state estimation. It can be effective.

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Abstract

La présente invention concerne un appareil et un procédé permettant de transmettre des informations de silence dans un système de communication sans fil, et un appareil et un procédé permettant d'acquérir l'état d'un canal au moyen de ces derniers. Un mode de réalisation de la présente invention concerne une technologie permettant de générer et de transmettre des informations de silence comprenant : un premier champ de données ayant une cellule serveuse pour recevoir en provenance de cellules périphériques, dans un environnement à cellules multiples, au moins l'un d'une séquence CSI-RS, du nombre de ports d'antennes CSI-RS, d'un rapport cyclique CSI-RS, et d'informations de décalage de sous-trame de transmission CSI-RS, et à utiliser celles-ci pour exprimer le cycle et décaler les sous-trames de silence qui concernent des informations portant sur un bloc de ressource pouvant générer un brouillage entre des cellules périphériques et des signaux CSI-RS ; et un second champ de données destiné à exprimer une séquence de silence spécifique, qui doit être soumis à un silence à l'intérieur des sous-trames de silence, comportant soit 12 bits soit 28 bits représentant l'application d'un silence dans un format binaire. Conformément à la présente invention, les informations de silence, qui permettent d'éviter un brouillage entre les cellules périphériques et le CSI-RS, peuvent être configurées et transmises de manière efficace en minimisant le surdébit, cela permettant un décodage précis et efficace et par conséquent, une estimation précise de l'état d'un canal.
PCT/KR2011/006008 2010-08-13 2011-08-16 Appareil et procédé pour la transmission d'informations de silence et appareil et procédé permettant d'acquérir l'état d'un canal au moyen de ce dernier Ceased WO2012021047A2 (fr)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
WO2013133597A1 (fr) * 2012-03-08 2013-09-12 엘지전자 주식회사 Procédé et appareil pour la transmission d'informations afin d'effectuer un rapport dans un système de communication sans fil
WO2013133596A1 (fr) * 2012-03-05 2013-09-12 엘지전자 주식회사 Procédé et appareil pour présenter un rapport de mesure dans un système de communication sans fil
WO2014058170A1 (fr) * 2012-10-09 2014-04-17 주식회사 케이티 Procédé de mesure des interférences dans une liaison descendante et dispositif associé
WO2021097588A1 (fr) * 2019-11-18 2021-05-27 Qualcomm Incorporated Améliorations apportées à un signal de référence d'informations d'état de canal à action directe analogique

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WO2006004968A2 (fr) * 2004-06-30 2006-01-12 Neocific, Inc. Procedes et appareil de commande de puissance dans des systemes sans fil multiporteuse
CN101142839B (zh) * 2005-03-14 2013-04-24 艾利森电话股份有限公司 改进通信系统中的切换的方法、系统和节点
KR20100073976A (ko) * 2008-12-23 2010-07-01 엘지전자 주식회사 상향링크 전송 전력을 제어하는 방법 및 이를 위한 장치
KR101635883B1 (ko) * 2009-02-03 2016-07-20 엘지전자 주식회사 하향링크 참조 신호 송수신 기법

Cited By (6)

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Publication number Priority date Publication date Assignee Title
WO2013133596A1 (fr) * 2012-03-05 2013-09-12 엘지전자 주식회사 Procédé et appareil pour présenter un rapport de mesure dans un système de communication sans fil
US10009785B2 (en) 2012-03-05 2018-06-26 Lg Electronics Inc. Method and apparatus for carrying out measurement report in wireless communication system
WO2013133597A1 (fr) * 2012-03-08 2013-09-12 엘지전자 주식회사 Procédé et appareil pour la transmission d'informations afin d'effectuer un rapport dans un système de communication sans fil
US9801087B2 (en) 2012-03-08 2017-10-24 Lg Electronics Inc. Method and apparatus for transmitting information for reporting in wireless communication system
WO2014058170A1 (fr) * 2012-10-09 2014-04-17 주식회사 케이티 Procédé de mesure des interférences dans une liaison descendante et dispositif associé
WO2021097588A1 (fr) * 2019-11-18 2021-05-27 Qualcomm Incorporated Améliorations apportées à un signal de référence d'informations d'état de canal à action directe analogique

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