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WO2014058170A1 - Procédé de mesure des interférences dans une liaison descendante et dispositif associé - Google Patents

Procédé de mesure des interférences dans une liaison descendante et dispositif associé Download PDF

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Publication number
WO2014058170A1
WO2014058170A1 PCT/KR2013/008777 KR2013008777W WO2014058170A1 WO 2014058170 A1 WO2014058170 A1 WO 2014058170A1 KR 2013008777 W KR2013008777 W KR 2013008777W WO 2014058170 A1 WO2014058170 A1 WO 2014058170A1
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Prior art keywords
interference measurement
measurement resource
interference
resource
csi
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English (en)
Korean (ko)
Inventor
강승현
최우진
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KT Corp
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KT Corp
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Priority claimed from KR1020130092178A external-priority patent/KR20140045872A/ko
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/345—Interference values
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/27—Monitoring; Testing of receivers for locating or positioning the transmitter

Definitions

  • the present invention relates to a method and apparatus for measuring interference in the downlink, and more particularly, to a technique for changing the location of measurement resources for measuring interference more accurately.
  • LTE Long Term Evolution
  • LTE-Advanced of the current 3GPP series are high-speed and large-capacity communication systems that can transmit and receive various data such as video and wireless data out of voice-oriented services.
  • the development of technology capable of transferring large amounts of data is required.
  • As a method for transmitting a large amount of data data can be efficiently transmitted using a plurality of cells.
  • a coordinated multi-point transmission / reception system (CoMP system) or heterogeneous network, in which two or more different transmission / reception points cooperate to transmit a signal, a plurality of transmission / reception systems are mixed.
  • CoMP system coordinated multi-point transmission / reception system
  • heterogeneous network in which two or more different transmission / reception points cooperate to transmit a signal, a plurality of transmission / reception systems are mixed.
  • the present invention intends to propose a method of randomly hopping resources so that resources used for interference measurement do not overlap between base stations or clusters.
  • the position of the initially allocated IMR is randomly changed over time, so that even if an interference measurement resource (IMR) collision occurs between CoMP clusters at any time, different IMRs are used over time.
  • IMR interference measurement resource
  • a method for setting an interference measurement resource in a downlink includes setting a first interference measurement resource, transmitting setting information of the first interference measurement resource to a user terminal, and Calculating a location of the second interference measurement resource to be hopped to be different from the setting of the first interference measurement resource using a pseudo random sequence, and a downlink signal so that the user terminal measures interference with the first or second interference measurement resource. And transmitting the interference information measured by the user terminal in the first or second interference measurement resource.
  • a method for measuring interference in an interference measurement resource in a downlink by a user terminal includes receiving configuration information of a first interference measurement resource from a base station, so as to be different from configuration of a first interference measurement resource. Calculating a location of the second interference measurement resource to be hopped in the same manner as a base station, measuring interference using a downlink signal received as the first or second interference measurement resource, and the measured interference information Transmitting to the base station.
  • the base station sets a first interference measurement resource, the control unit for calculating the position of the second interference measurement resource to be hopped to be different from the first interference measurement resource using a pseudo random sequence, the first And a transmitter for transmitting a downlink signal so that the user terminal measures interference with a first or second interference measurement resource, and a receiver for receiving interference information measured by the user terminal in the first or second interference measurement resource.
  • the user terminal receives the setting information of the first interference measurement resource from the base station and receives a downlink signal from the first or second interference measurement resource, the setting of the first interference measurement resource
  • resources can be randomly hopped so that resources used for interference measurement do not overlap between base stations or clusters, thereby improving the accuracy of the interference measurement.
  • FIG. 1 is a diagram illustrating CSI-RS-Config information elements (IEs).
  • FIG. 2 is a diagram illustrating a location of an RE used for CSI-RS and ZP-CSI-RS transmission in one PRB pair according to another embodiment.
  • 3 is a diagram for interference generated between different CoMP clusters according to another embodiment.
  • 4 and 5 illustrate subframe periods and subframe offsets of two IMRs allocated by different CoMP clusters.
  • FIG. 6 is a diagram illustrating a process in which a base station hops using an offset calculated by using a pseudo random sequence according to an embodiment of the present invention.
  • FIG. 7 is a diagram illustrating an embodiment of reconstructing an IMR index for resource hopping and mapping to an original index.
  • FIG. 8 is a diagram illustrating a process of finally calculating a location of a second interference measurement resource by shifting after hopping according to an embodiment of the present invention.
  • FIG. 9 is a diagram illustrating a process of measuring interference in a user terminal according to an embodiment of the present invention.
  • FIG. 10 is a diagram illustrating a configuration of a base station according to another embodiment.
  • FIG. 11 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • the wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like.
  • the wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB).
  • a user terminal is a comprehensive concept of a terminal in wireless communication.
  • UE user equipment
  • LTE Long Term Evolution
  • HSPA High Speed Packet Access
  • MS Mobile Station
  • UT User Terminal
  • SS Global System for Mobile communications
  • a base station or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS. It may be called other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and the like.
  • a base transceiver system an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and the like.
  • a base station or a cell is interpreted in a comprehensive sense to indicate some areas or functions covered by a base station controller (BSC) in CDMA, a NodeB in WCDMA, an eNB or a sector (site) in LTE, and the like.
  • BSC base station controller
  • Various coverage such as mega cell, macro cell (hereinafter referred to as 'eNB'), micro cell, pico cell, femto cell, small cell and relay node, RRH, RU communication range It is meant to encompass all areas.
  • the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station.
  • the eNB, RRH, antenna, RU, LPN, point, transmit / receive point, transmit point, receive point, etc. become embodiments of the base station according to the configuration of the radio region.
  • the base station may indicate the radio area itself to receive or transmit a signal from a viewpoint of a user terminal or a neighboring base station.
  • megacells, macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit and receive points, transmit points, and receive points are collectively referred to the base station.
  • LPNs low power nodes
  • eNBs transmit and receive points, transmit points, and receive points
  • the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to.
  • the user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to.
  • the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal
  • the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • OFDM-FDMA OFDM-TDMA
  • OFDM-CDMA OFDM-CDMA
  • One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB.
  • 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.
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH).
  • a data channel is configured such as PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel) and the like to transmit data.
  • a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
  • a wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal.
  • antenna transmission system a cooperative multi-cell communication system.
  • the CoMP system may include at least two multiple transmission / reception points and terminals.
  • the multiple transmit / receive point may be at least one RRH having a high transmit power or low transmit power in the macro cell region, which is wired controlled by an optical cable or fiber optic to the base station or macro cell and the eNB. have.
  • downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal
  • uplink refers to a communication or communication path from a terminal to multiple transmission / reception points.
  • a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
  • a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be expressed in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.
  • the eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH.
  • a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted.
  • the first terminal UE1 may transmit an uplink signal to the eNB and the second terminal may transmit an uplink signal to the RRH.
  • CoMP measurement set is composed of one or more transmission point (TP) that can transmit DL data to the terminal.
  • the UE assumes each TP included in the CoMP measurement set as a serving TP transmitting DL signals to the UE, and various CoMP schemes (Single point transmission, Dynamic point selection (DPS) or Dynamic point). send CSI feedback for blanking (DPB)).
  • CoMP schemes Single point transmission, Dynamic point selection (DPS) or Dynamic point. send CSI feedback for blanking (DPB)).
  • the UE In order to transmit CSI feedback, the UE first calculates various Signal to interference plus noise ratio (SINR) values according to the serving TP and the assumed CoMP scheme as shown in the following table.
  • SINR Signal to interference plus noise ratio
  • Measurement set consists of two TPs (TP-A and TP-B)
  • Table 2 Measurement set consists of three TPs (TP-A, TP-B and TP-C)
  • S A , S B and S C represent the signal power transmitted by TP-A, TP-B and TP-C, respectively, and I A , I B and I C are TP-A, TP-B respectively. And it represents the interference power (interference power) transmitted from the TP-C.
  • I O represents the interference intensity transmitted from the TPs not included in the measurement set, and N represents background noise.
  • the UE In order to calculate the various SINR values, the UE first receives a channel-state information-reference signal (CSI-RS) from all the TPs in the measurement set, and calculates signal strength values of the corresponding TPs.
  • CSI-RS channel-state information-reference signal
  • the terminal should calculate the interference term (interference term) of the SINR.
  • the denominator of the SINR equation is summarized as shown in Tables 3 and 4 below by interference estimation.
  • the terminal receives an IMR (interference measurement resource) for each interference estimation, measures the signal strength received through the corresponding IMR, and uses this value as the interference term of the SINR.
  • One IMR is allocated to one interference estimate, and when the IMR is assigned, the TPs included in the measurement set transmit DL signals to be received as interference to the UE in accordance with the interference estimation as described in Tables 3 and 4 above.
  • the IMR is not muted to transmit the DL signal so that interference does not occur.
  • FIG. 1 is a diagram illustrating CSI-RS-Config information elements (IEs).
  • CSI-RS allocation information may be transmitted to a terminal using a CSI-RS-Config message among RRC (Radio Resource Control) messages.
  • RRC Radio Resource Control
  • the allocation information of the CSI-RS of the serving TP is transmitted to the csi-RS-r10 IE of the CSI-RS-Config message.
  • the zeroTxPowerCSI-RS-r10 IE transmits information on resource element (RE) muting in which the serving TP does not transmit a DL signal. If another TP uses the same RE as the RE muted by the serving TP for transmitting the CSI-RS, the DL signal of the serving TP does not interfere with the CSI-RS of the other TP.
  • the set of REs used by the serving TP for RE muting in order for the UE to receive CSI-RSs of other TPs without interference effects is called ZP-CSI-RS (Zero-Power CSI-RS).
  • FIG. 2 is a diagram illustrating a location of an RE used for CSI-RS and ZP-CSI-RS transmission in one PRB pair according to another embodiment.
  • the CSI-RS and ZP-CSI-RS are transmitted only for the RE positions corresponding to 210, 220, and 230 in the above figure, and 210, 220, 230, 240, and 250 for the TDD. , 260 are all used.
  • the allocation information of the CSI-RS and the ZP-CSI-RS is transmitted to the UE in the RRC message containing two pieces of information, a resource configuration and a sub-frame configuration.
  • the resource setting information is configured in a bitmap format, and one bit position in the bitmap indicates an RE position corresponding to one alphabet of FIG. 2.
  • the subframe configuration information uses the following table to inform the UE of the transmission period and offset value at which the CSI-RS or ZP-CSI-RS is transmitted in subframe units.
  • One IMR like the ZP-CSI-RS, consists of four REs in one PRB pair. Each IMR uses the resource configuration information and the subframe configuration information to transmit allocation information to the terminal in the same manner as the ZP-CSI-RS.
  • 3 is a diagram for interference generated between different CoMP clusters according to another embodiment.
  • IMR resources used by one CoMP cluster are reused in another CoMP cluster.
  • the basic unit that reuses the constant IMR resource is represented as a CoMP cluster, and one CoMP cluster may be composed of only TPs belonging to one CoMP measurement set or a CoMP cluster with multiple CoMP measurement sets. Can be configured.
  • 310 and 320 may configure one CoMP cluster.
  • two CoMP clusters should use different IMR resource settings for the same subframe.
  • 4 and 5 illustrate subframe periods and subframe offsets of two IMRs allocated by different CoMP clusters.
  • the IMR subframe period of CoMP cluster A is 10 ms as shown in 410.
  • the IMR subframe period of CoMP Cluster B is also 10 ms, as shown in 420.
  • IMRs are allocated to four subframes of both clusters A and B.
  • CoMP cluster A when IMR is allocated to the UE existing in each CoMP cluster at the same D position, according to the interference estimation, in the worst case, CoMP cluster A also does not transmit a signal in 4 subframes 411 and 412, and CoMP cluster B Signals are not transmitted in subframes 421 and 422 of FIG. 4, and as a result, interference cannot be accurately measured.
  • the D position is an area indicated by a horizontal line pattern at 411 and 412 and an area indicated by a vertical line pattern at 421 and 422.
  • the subframe period value is always defined as a multiple of 5. If the subframe offset value is modulated to 5, even if time passes, It is impossible to accurately measure the interference generated between CoMP clusters.
  • the IMR subframe period of CoMP Cluster A is 10ms as shown in 510.
  • the IMR subframe period of CoMP Cluster B is 20ms, such as 520.
  • the IMR allocation of cluster A is equal to 511, 512, 513 at the D position, and the IMR allocation of cluster B is equal to 521, 523 at the D position. In this case, the IMRs overlap at 511 and 521, 513, and 523 in the first and third cycles based on the cluster A.
  • the present invention provides an IMR hopping method and apparatus for more accurately measuring the interference generated between CoMP clusters. More specifically, the present invention proposes an IMR hopping method using a pseudo-random sequence used in LTE or LTE-Advanced. As a result of the present invention, the position of an initially allocated IMR is randomly changed over time, so that even if an IMR collision occurs between CoMP clusters at any time, different IMRs are used to measure more accurate interferences over time. can do.
  • the LTE pseudo-random sequence generation method is as follows.
  • the pseudo random sequence is defined by a 31-bit long Gold sequence.
  • Nc 1600 and the first m-sequence is Is initialized to Initialization of the second m-sequence depends on the value of the sequence application. Is determined.
  • the IMR hopping method using pseudo random sequence is divided into three steps as follows.
  • FIG. 6 is a diagram illustrating a process in which a base station hops using an offset calculated by using a pseudo random sequence according to an embodiment of the present invention.
  • the base station performs the steps of S605 to S630 in order to set the interference measurement resource (Interference Measurement Resource) in the downlink.
  • the base station sets the first interference measurement resource and transmits the calculated configuration information of the first interference measurement resource to the user terminal (S605).
  • the configuration information may use the CSI-RS Config IE which is the above-described CSI-RS configuration information element.
  • the base station may transmit only zeroTxPowerCSI-RS-r10 IE information to the user terminal in the CSI-RS Config.
  • the base station calculates the position of the second interference measurement resource to be hopped to be different from the setting of the first interference measurement resource by using the pseudo random sequence (S610).
  • the second interference measurement resource is characterized in that the hopping so as to vary with the passage of time and the setting of the first interference measurement resource.
  • the base station transmits the downlink signal to the user terminal to measure the interference to the first or second interference measurement resource (S620). Thereafter, the base station receives the interference information measured by the user terminal in the first or second interference measurement resource (S630).
  • Information necessary for calculating the location of the second interference measurement resource may be promised by transmitting to the user terminal through higher layer signaling such as RRC in advance. Accordingly, the user terminal may also calculate the location of the second interference measurement resource in the same manner as the base station. This will be described in detail in the operation of the user terminal.
  • step of calculating using the pseudo-random sequence of S610 consists of setting the initial value of the pseudo-random sequence and setting the offset to be used for the hopping of the second interference measurement resources in the generated sequence.
  • a method of setting an initial value for generating pseudorandom sequences may be applied to any one of methods 1-1, 1-2, and 1-3.
  • the initial value C init of the pseudorandom sequence is composed of 31 bits binary values, and the present invention proposes a method of initializing at various times using various values as follows.
  • SFN system frame number
  • pseudorandom sequence generation can be initialized every 5ms within a frame in consideration of 5ms, which is the minimum period of the IMR subframe.
  • An embodiment is shown in Equation 3 below.
  • n s is a slot index within one frame.
  • Is a subframe index.
  • T IMR can be 5, 10, 20, 40 or 80 ms. Applying this is the same as Equation 4.
  • n ID is a virtual cell ID used for CSI-RS configuration.
  • Cell ID used in the above methods 1-1 to 1-3. May be used as an index of the serving TP among the TPs constituting the CoMP cluster.
  • the cell identifiers used in the above methods 1-1 to 1-3 Can be used as a function value using the index of the TPs constituting the CoMP cluster.
  • a method of setting a hopping offset to be used for IMR hopping in the generated pseudorandom sequence may apply any one of methods 2-1, 2-2, and 2-3.
  • An offset value to be used for IMR hopping may be set in the pseudorandom sequence c (n) generated using the initial value C init .
  • the present invention proposes a method of resource hopping an initially allocated IMR using various offset values as follows.
  • IMR hops using a hopping offset value generated as a function of system frame number.
  • An embodiment is the same as Equation 5.
  • the N IMR represents the number of IMR resources that can be allocated by the IMR.
  • IMR hopping is performed using a hopping offset value generated as a function of system frame number and subframe number.
  • An embodiment is equal to the equation (6).
  • IMR hopping is performed using a system frame number, a subframe number, and a hopping offset value generated as a function of the IMR period.
  • An embodiment is shown in Equation 7.
  • the hopping method using the offset value is as follows. If the index of the resource setting (first interference measurement resource) used initially for IMR allocation is r and the set IMR hopping offset value is ⁇ , the resource-hopping IMR index r ' may be expressed as Equation (8).
  • the resource hopping IMR index r ' may be configured as a function of the subframe number.
  • Equation (9) An embodiment is shown in Equation (9).
  • an index of the second interference measurement resource may be calculated by applying a hopping offset to the index of the first interference measurement resource.
  • IMR when the number of IMR allocable resources is variable, in the method of setting a hopping offset to be used for IMR hopping in the generated pseudorandom sequence and in the hopping method using an offset value, IMR is the same as that of CSI-RS and ZP-CSI-RS. Since the resource set is used, only resources that do not overlap with the resources allocated to the CSI-RS and the ZP-CSI-RS can be used as IMR assignable resources. In this case, the N IMR may have a variable value according to resources allocated with CSI-RS and ZP-CSI-RS for each subframe.
  • IMR uses the same resource set as CSI-RS and ZP-CSI-RS, and the resource index included in the same set is called a first index.
  • the index is reconstructed only with resources to which the IMR can be allocated except for the resources to which the CSI-RS and ZP-CSI-RS are allocated.
  • the reconstructed index is called a second index of the first interferometric resource.
  • the index is reconstructed to only the resources to which the IMR can be allocated to the second index of the second interferometric resource.
  • IMR hopping occurs at the second index.
  • a second index of the first interferometric resource to which the first interferometric resource is allocated is found.
  • IMR hopping is performed based on the second index of the first interferometric resource on the second index of the second interferometric resource.
  • the second interference measurement resource may be allocated so as not to overlap with the CSI-RS or ZP-CSI-RS from the original first interference measurement resource.
  • FIG. 7 is a diagram illustrating an embodiment of reconstructing an IMR index for resource hopping and mapping to an original index.
  • the CSI-RS and the ZP-CSI-RS are allocated to the same location in a subframe to which the first interference measurement resource and the second interference measurement resource are allocated.
  • the configuration of an IMR index for resource hopping may be reconfigured as shown at 710 at 720.
  • the second index may be reconfigured as shown in 720.
  • the first indexes of the resource to which the CSI-RS or ZP-CSI-RS resource is allocated are 1, 5, and 8, and the first index to which the first interference measurement resource is allocated is 3. If the resource indexes 1, 5, and 8 are removed from the first index configuration of 730 and then reconfigured to the second index configuration, it is as follows.
  • the second index of the first interference measurement resource is two. In this case, when IMR hopping is performed as shown in 750, the second index of the hopped second interference measurement resource becomes 5 as shown in 760. If it is mapped to the first index before reconstruction, it becomes 7 as shown in 770.
  • the second interference measurement resource may be set such that the CSI-RS or ZP-CSI-RS does not overlap with the allocated resource.
  • an embodiment of shifting may be applied instead of the index reconstruction. That is, when the second interference measurement resource is calculated and the CSI-RS or ZP-CSI-RS resource is included in the resource to which the calculated second interference measurement resource is allocated, the second interference measurement resource is an integer in a resource set. It can shift by K. K has an integer of + or-and can shift the position of the second interferometric measurement resource.
  • FIG. 8 is a diagram illustrating a process of finally calculating a location of a second interference measurement resource by shifting after hopping according to an embodiment of the present invention.
  • CSI-RS or ZP-CSI-RS hops to allocated resources during IMR hopping, a process of shifting an offset value once is shown.
  • the offset value may be shifted once. That is, when the CSI-RS or ZP-CSI-RS resource index is 1, 5, or 8, such as 810 or 840, and is set to the first interference measurement resource index 3, the hopping offset is calculated using the pseudo random sequence of the present invention. As a result, when the resource index is 5, the shift may be performed by 1 as shown in 830 and 860.
  • the resource index 6 may be set to be the index of the second interference measurement resource by shifting to the resource index 6 by adding 1 to the offset calculated as 830.
  • the resource index 4 may be set to be the index of the second interference measurement resource.
  • +1 or -1 is an embodiment of the integer K to be shifted.
  • FIG. 9 is a diagram illustrating a process of measuring interference in a user terminal according to an embodiment of the present invention.
  • the user terminal to perform each step of FIG. 9 is an apparatus for measuring interference in the interference measurement resource in the downlink, and the user terminal receives configuration information of the first interference measurement resource from the base station (S905). Thereafter, the user terminal calculates the location of the second interference measurement resource to be hopped to be different from the setting of the first interference measurement resource in the same manner as the base station (S910).
  • the second interference measurement resource is characterized in that the hopping so as to vary with the passage of time and the setting of the first interference measurement resource.
  • the method of calculating or calculating the second interference measurement resource between the base station and the user terminal is selected and applied among the above-described methods 1-1 to 1-3, method 2-1 to 2-3, and a method of applying an offset.
  • the base station and the terminal are set in a predetermined manner, or the terminal may receive the calculation method and necessary information from the base station through higher layer signaling. Thereafter, the user terminal measures interference using the downlink signal received from the first or second interference measurement resource (S920). The user terminal transmits the measured interference information to the base station (S930).
  • FIG. 10 is a diagram illustrating a configuration of a base station according to another embodiment.
  • the base station 1000 includes a controller 1010, a transmitter 1020, and a receiver 1030.
  • the controller 1010 randomly changes the position of the initially allocated IMR required to carry out the above-described present invention as time passes, so that even if an IMR collision occurs between CoMP clusters at random times, IMR is used to control the overall operation of the base station according to how to measure more accurate interference.
  • the transmitter 1020 and the receiver 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention with a user terminal.
  • the controller 1010 of the base station 1000 that sets hopping in the CoMP cluster sets the location of the second interference measurement resource to be hopped to set the first interference measurement resource and to be different from the setting of the first interference measurement resource.
  • the transmitter 1020 transmits a downlink signal to the terminal to the user terminal to measure the interference to the first or second interference measurement resource.
  • the receiver 1030 receives the interference information measured by the user terminal in the first or second interference measurement resource.
  • the second interference measurement resource has a position different from the setting of the first interference measurement resource over time.
  • the controller 1010 may set an initial value of the pseudo random sequence, set an offset to be used for hopping of the second interference measurement resource in the generated sequence, and calculate the offset using the pseudo random sequence.
  • the controller 1010 may include any of cell identification information (Cell ID), a system frame number, a minimum period of a minimum IMR subframe, or an IMR period.
  • Cell ID cell identification information
  • One or more initial values of the pseudo random sequence may be set.
  • the controller 1010 may generate the offset using any one or more of a system frame number, a subframe number, or an IMR period.
  • the controller 1010 reconstructs the second index configuration from the first index configuration including CSI-RS or ZP-CSI-RS to the second index configuration excluding the CSI-RS or ZP-CSI-RS.
  • the location of the second interference measurement resource may be calculated by mapping the calculated index of the second interference measurement resource to the first index configuration.
  • the controller 1010 shifts the second interference measurement resource by an integer K when the calculated second interference measurement resource is hopped to a resource allocated with CSI-RS or ZP-CSI-RS. ) To calculate the location of the second interference measurement resource.
  • the base station performs the operation described with reference to FIG.
  • FIG. 11 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • a user terminal 1100 includes a receiver 1130, a controller 1110, and a transmitter 1120.
  • the receiver 1130 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the controller 1110 calculates the position of the second interference measurement resource whose initial allocated position of the IMR necessary to carry out the present invention is randomly changed over time in the same manner as the base station, Controlling the overall operation of the user terminal according to a method capable of measuring interference in the second interference measurement resource. As a result, even if an IMR collision occurs between CoMP clusters, By performing interference measurements on different IMRs, accurate interference measurement results can be calculated.
  • the transmitter 1120 transmits uplink control information, data, and a message to a base station through a corresponding channel.
  • the receiving unit 1130 receives the setting information of the first interference measurement resource from the base station, and the controller 1110 identifies the position of the second interference measurement resource to be hopped to be different from the setting of the first interference measurement resource. Computation is performed in the same manner as the base station, and the interference is measured using the downlink signal received as the first or second interference measurement resource.
  • the transmitter 1120 transmits the measured interference information to the base station.
  • the user terminal performs the operation described above with reference to FIG.
  • the embodiments of the present invention discussed so far present an IMR hopping method and apparatus for more accurately measuring the interference generated between CoMP clusters.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/KR2013/008777 2012-10-09 2013-10-01 Procédé de mesure des interférences dans une liaison descendante et dispositif associé Ceased WO2014058170A1 (fr)

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KR20120111773 2012-10-09
KR10-2012-0111773 2012-10-09
KR1020130092178A KR20140045872A (ko) 2012-10-09 2013-08-02 다운링크에서의 간섭을 측정하는 방법 및 그 장치
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WO2017078475A1 (fr) * 2015-11-06 2017-05-11 삼성전자 주식회사 Procédé et dispositif pour émettre un signal de référence dans un système de communication
CN113273150A (zh) * 2018-11-02 2021-08-17 株式会社Ntt都科摩 用户终端以及无线通信方法
US11617095B2 (en) * 2017-06-13 2023-03-28 Nec Corporation Methods, terminal device, network devices and apparatuses for interference measurement

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WO2012021047A2 (fr) * 2010-08-13 2012-02-16 (주)팬택 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
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CN113273150A (zh) * 2018-11-02 2021-08-17 株式会社Ntt都科摩 用户终端以及无线通信方法

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