WO2016003099A1 - Procédé de mesure de canal et dispositif associé - Google Patents

Procédé de mesure de canal et dispositif associé Download PDF

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Publication number
WO2016003099A1
WO2016003099A1 PCT/KR2015/006291 KR2015006291W WO2016003099A1 WO 2016003099 A1 WO2016003099 A1 WO 2016003099A1 KR 2015006291 W KR2015006291 W KR 2015006291W WO 2016003099 A1 WO2016003099 A1 WO 2016003099A1
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Prior art keywords
information
cell
configuration information
reference signal
measurement configuration
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PCT/KR2015/006291
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English (en)
Korean (ko)
Inventor
박규진
최우진
Original Assignee
주식회사 케이티
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Priority claimed from KR1020150065259A external-priority patent/KR20160005307A/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Publication of WO2016003099A1 publication Critical patent/WO2016003099A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes

Definitions

  • the present invention relates to a channel measuring method of a terminal and an apparatus thereof. More specifically, the present invention provides a method and apparatus for detecting and measuring a channel over an unlicensed spectrum.
  • LTE Long Term Evolution
  • LTE-Advanced of the current 3GPP series are high-speed, high-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.
  • a technique for allowing carrier aggregation to be applied in various deployment scenarios has been discussed.
  • the carrier merging technology is a technology for improving data transmission / reception rate by merging one or more component carriers to transmit and receive data, and thus, an available frequency is increased for the terminal, thereby processing a large amount of data at high speed.
  • each frequency band is used by different wireless communication systems according to the policy, there is a problem that the compatibility is poor.
  • the present invention is to propose a specific method that can prevent the interference of the signal when different wireless communication systems transmit and receive data using the same frequency band.
  • the present invention is to propose a method and apparatus that can provide a mobile communication service using a frequency band that can be shared by a plurality of users.
  • a method for measuring a channel by a terminal includes: receiving measurement configuration information for cell discovery and measurement from a base station; and receiving a reference signal transmitted from a cell based on the measurement configuration information And measuring a cell search or a channel state using measurement configuration information and reference signals, wherein the cell is a cell using a frequency of an unlicensed band shared by one or more communication systems.
  • the present invention provides a method for controlling the channel measurement of the terminal by the base station, generating the measurement configuration information for cell search and measurement, transmitting the measurement configuration information and the measurement configuration information and the reference signal transmitted from the cell And receiving channel state measurement information measured from the terminal, wherein the cell is a cell using an unlicensed band frequency shared by one or more communication systems.
  • the present invention is a terminal for measuring a channel, the receiving unit for receiving the measurement configuration information for cell search and measurement from the base station, and receiving the reference signal transmitted from the cell based on the measurement configuration information and measurement configuration information and reference
  • the present invention is a base station for controlling the channel measurement of the terminal, the control unit for generating the measurement configuration information for the cell search and measurement, the transmitter for transmitting the measurement configuration information and the measurement configuration information based on the reference signal transmitted from the cell It includes a receiver for receiving the measured channel state measurement information from the terminal, the cell provides a base station device which is a cell using an unlicensed band frequency shared by one or more communication systems.
  • the present invention described above provides an effect of preventing interference of signals and transmitting large amounts of data at high speed when different wireless communication systems transmit and receive data using the same frequency band.
  • the present invention provides an effect that can prevent the terminal operation ambiguity when performing carrier aggregation using the unlicensed band frequency.
  • FIG. 1 is a diagram illustrating a reference signal resource mapping in a conventional mobile communication system by way of example.
  • FIG. 2 is a diagram illustrating an example of measurement configuration information for an LTE / LTE-Advanced cell.
  • FIG. 3 is a view for explaining an operation of a terminal capable of performing communication using an unlicensed band frequency resource of the present invention.
  • FIG. 4 is a diagram illustrating a signal flow according to an embodiment of the present invention.
  • FIG. 5 is a view for explaining the operation of the terminal according to another embodiment of the present invention.
  • FIG. 6 is a view for explaining the operation of the terminal according to another embodiment of the present invention.
  • FIG. 7 is a view for explaining the operation of the base station according to another embodiment of the present invention.
  • FIG. 8 is a diagram for describing an operation of a base station according to another embodiment of the present invention.
  • FIG. 9 is a diagram illustrating a terminal configuration according to another embodiment of the present invention.
  • FIG. 10 is a diagram showing a configuration of a base station according to another embodiment of the present invention.
  • 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 generic concept meaning a terminal in wireless communication.
  • user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.
  • 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.
  • Other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell may be called.
  • RRH remote radio head
  • RU radio unit
  • a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, small cell communication range.
  • BSC base station controller
  • 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 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 / receive points, transmit points, and receive points are collectively referred to as base stations. do.
  • 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
  • a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers.
  • the uplink and the downlink include a Physical Downlink Control CHannel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control CHannel (EPDCCH), and the like.
  • Control information is transmitted through the same control channel, and data is configured by a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • control information may also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).
  • EPDCCH enhanced PDCCH
  • extended PDCCH extended PDCCH
  • 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 is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
  • an eNB a base station or a macro cell
  • a high transmission power or a low transmission power in a macro cell region which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
  • 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, an EPDCCH, and a PDSCH may be expressed in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH.
  • a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used as a meaning including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.
  • the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.
  • the EPDCCH which is an embodiment of the present invention, may be applied to the portion described as the PDCCH, and the EPDCCH may be applied to the portion described as the EPDCCH as an embodiment of the present invention.
  • high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.
  • the eNB performs downlink transmission to the terminals.
  • 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.
  • PUSCH physical uplink shared channel
  • the present invention relates to an operation method when a terminal performs carrier aggregation (or dual connectivity) of an LTE or LTE-Advanced radio cell or carrier operating through a licensed band and a cell of an unlicensed band.
  • the present invention relates to a specific method of discovering an LTE / LTE-Advanced radio cell formed in an unlicensed band and performing cell measurement for downlink channel measurement for the corresponding cell.
  • the unlicensed band in the present specification means a frequency band shared with other wireless communication systems other than the frequency band used exclusively in a mobile communication system such as LTE / LTE-Advanced. That is, a cell using an unlicensed band frequency refers to a cell using a frequency band that can be shared and used by one or more communication systems. Therefore, the unlicensed band is not a frequency band exclusively used by a specific communication system or a specific network operator, but means a frequency band shared by a plurality of communication systems or a plurality of operators.
  • FIG. 1 is a diagram illustrating a reference signal resource mapping in a conventional mobile communication system by way of example.
  • LTE / LTE-Advanced Release 10 introduces carrier aggregation technology to improve the data rate of UEs, procedures related to mobility management of UEs such as handover and cell selection / reselection are performed.
  • the downlink reference signal measurement operation for performing various operations is performed.
  • the UE may perform cell discovery / measurement (cell discovery or necessary for supporting procedures related to carrier merging, such as adding / release of secondary serving cell (Scell) or activating / deactivating Scell). Measurement) is also performed based on the RRM measurement result of the UE based on the downlink reference signal.
  • all base stations of LTE / LTE-Advanced Release 10 or higher forming a plurality of cells through a plurality of frequency bands should transmit downlink reference signals in all cells configured through the respective frequency bands.
  • the base station transmits 1, 2, or 4 CRS (Cell Specific Reference Signals) in all downlink subframes according to the number of downlink transmission antenna ports supported through the corresponding cell for the RRM measurement of the UE, as shown in FIG. 1. Had to send.
  • the corresponding CRS is transmitted only through the first OFDM symbol or the second OFDM symbol of the first slot.
  • the terminal receives the CRS transmitted through each downlink subframe for a predetermined time, measures RSRP (Reference Signal Received Power) / RSRQ (Reference Signal Received Quality), and reports it to the base station.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • the UE acquires downlink synchronization using a PSS / SSS based downlink signal transmitted through a downlink subframe in each cell for discovery / measurement of neighboring cells.
  • the terminal receives the CRS and performs RSRP or RSRQ measurement.
  • the base station receives the measurement result measured by the terminal using the CRS and determines whether to merge the carrier of the terminal.
  • the base station may transmit the measurement configuration information for the SCells configured in the base station to help the SCell search / measurement that is the basis of the carrier aggregation to the terminal through higher layer signaling (for example, RRC signal).
  • higher layer signaling for example, RRC signal.
  • FIG. 2 is a diagram illustrating an example of measurement configuration information for an LTE / LTE-Advanced cell.
  • the measurement configuration information may be transmitted as included in the RRCConnectionReconfiguration message, and the corresponding information is measurement configuration information for the LTE / LTE-Advanced (E-UTRA) cell.
  • E-UTRA LTE / LTE-Advanced
  • a small cell on / off operation is newly introduced.
  • a new type of discovery reference signal (DRS) has been introduced to measure small cells to support small cell on / off operations. That is, CRS has been transmitted in all downlink subframes for RRM measurement of any cell up to the existing LTE Rel-11 system, and the UE has performed CRS based RRM measurement.
  • DRS discovery reference signal
  • Rel-12 when there is no terminal connected to any small cell or there is no data traffic, semi-static or dynamic small cell on / off that turns off the small cell. The off operation is discussed.
  • a DRS including PSS / SSS and CRS is set to support discovery / measurement of a terminal for a cell formed by the base station, or PSS / SSS, CRS and The DRS configured with the CSI-RS may be set.
  • the DRS may be defined to be set to a DRS opportunity and a period of the DRS opportunity through a DRS Measurement Timing Configuration (DMTC) to be transmitted to the UE through RRC signaling.
  • DMTC DRS Measurement Timing Configuration
  • the aforementioned DRS means N consecutive subframes in which DRS transmission is performed.
  • a radio access technology (RAT) for efficiently using a limited frequency band is intended to provide high spectral efficiency through technologies such as MIMO, ICIC, and CoMP.
  • RAT radio access technology
  • CA Carrier Aggregation
  • an unlicensed band unlike a licensed band, a plurality of users, including individuals, are freely available to provide wireless communication service within the regulation of each country, not a wireless channel exclusively used by any operator. .
  • signal interference and coexistence with other communication systems may occur when providing an LTE / LTE-Advanced service through an unlicensed band.
  • LTE Long Term Evolution
  • various short range wireless communication protocols such as WiFi, Bluetooth, and NFC
  • problems may arise.
  • a co-existence problem may occur for each LTE operator. Therefore, there is a need for a method for solving this problem.
  • LBT wireless channel access
  • LBT wireless channel access
  • FIG. 3 is a view for explaining an operation of a terminal capable of performing communication using an unlicensed band frequency resource of the present invention.
  • the primary carrier supports a frame structure in the form of FDD or TDD through the licensed band, and in the case of a secondary carrier configured through the unlicensed band in the form of downlink only. Can be configured.
  • the secondary carrier configured through the unlicensed band may be in the form of supporting both uplink and downlink. That is, in the terminal 300 performing carrier aggregation to perform communication, the primary carrier may process both uplink and downlink using a licensed band used exclusively by the corresponding mobile communication system. Meanwhile, the terminal 300 may process only downlink-only data using a frequency using an unlicensed band as a secondary carrier. Alternatively, the terminal 300 may process both uplink and downlink data through the secondary carrier.
  • an unlicensed band cell refers to a cell using a frequency of an unlicensed band shared by one or more communication systems.
  • the present invention relates to a specific method in which a terminal searches for an unlicensed band cell and performs channel measurement when the base station uses an unlicensed band cell. This is an operation required to improve communication efficiency because an unlicensed band cell is shared by multiple communication systems.
  • the corresponding unlicensed band cell should also transmit a downlink reference signal through a downlink subframe.
  • an unlicensed band cell has a problem in supporting a fixed frame structure due to interference or collision with other radio access technologies or unlicensed band cells of other mobile operators. .
  • a downlink subframe for periodically transmitting a reference signal for searching or measuring the corresponding unlicensed band cell is periodically checked. Difficult to set In the present invention, a downlink reference signal for unlicensed band cell search or measurement is referred to as a U-DRS or a reference signal.
  • the PSS / SSS periodically transmitted and the CRS-based discovery or measurement procedure transmitted through all downlink subframes, such as the above-described Rel-11 cell discovery or measurement procedure, or Or, the semi-static DMTC-based cell search or measurement procedure established through RRC signaling defined in Release 12 is difficult to apply.
  • a U-DRS for transmitting a U-DRS which is a reference signal for searching or measuring the unlicensed band cell. It is difficult to secure downlink subframes periodically. Accordingly, it is difficult to apply a cell search or measurement method based on measurement configuration information through higher layer signaling applied in an existing system. That is, a CRS-based cell search or measurement method transmitted through a PSS / SSS of 5 ms periods and all downlink subframes defined in existing Release 11 or lower systems, or a periodic DRS opportunity newly defined in Release 12 (DRS).
  • reception of a CRS or a DRS for cell discovery or measurement can be guaranteed at the terminal according to measurement configuration information through a corresponding RRC signal, but in the case of an unlicensed band cell Since the frequency band cannot be used exclusively, it cannot guarantee a fixed frame structure for fixed CRS transmission or a periodic DRS opportunity by DMTC.
  • the present invention proposes a procedure for dynamically searching or measuring an unlicensed band cell based on a control signal of a primary cell configured through a licensed band as a method for solving the aforementioned problem.
  • FIG. 4 is a diagram illustrating a signal flow according to an embodiment of the present invention.
  • the present invention provides a method for configuring a dynamic measurement through a control channel and a method for transmitting a dynamic reference signal according to the unlicensed band cell search or measurement method.
  • the terminal 401 of the present invention receives measurement configuration information for the discovery or measurement of the unlicensed band cell 409 from the base station 402 (S410).
  • the measurement configuration information includes information necessary for identifying a reference signal transmitted through the unlicensed band cell 409 and measuring a channel state based on the reference signal.
  • the terminal 401 receives a reference signal through an unlicensed band cell (S420).
  • the terminal 401 may receive the reference signal using the reference signal reception timing information included in the measurement configuration information.
  • the terminal 401 searches for a cell provided through the unlicensed band by using the received reference signal and measurement configuration information, and measures a channel state (S430).
  • the channel state may be performed through RSRP or RSRQ measurement using a reference signal.
  • the terminal 401 transmits the channel measurement result including the measured channel state result information to the base station 402 (S440).
  • the base station receives the information on the channel state of the unlicensed band cell 409 using the received channel measurement result, and whether or not another communication system or another mobile communication provider occupies or uses the frequency band of the unlicensed band cell 409. You can check. Through this, the base station 402 determines whether to use the unlicensed band cell 409 by determining whether to configure the unlicensed band cell 409 as a secondary cell of the terminal 401 or whether the configured unlicensed band cell 409 is activated. Can be.
  • the terminal can receive the reference signal at a non-periodic point of time by acquiring information related to the reception timing and reception of the reference signal transmitted by the unlicensed band cell through the base station having an RRC connection.
  • the base station may determine carrier aggregation or data transmission / reception using the corresponding unlicensed band cell to the terminal using channel state information of the unlicensed band cell measured by the terminal. Therefore, it is possible to prevent interference or collision with other mobile communication providers or other communication systems and to increase data transmission rate by using an unlicensed band cell.
  • FIG. 5 is a view for explaining the operation of the terminal according to another embodiment of the present invention.
  • the cell In a method for measuring a channel by a terminal of the present invention, receiving measurement configuration information for cell search and measurement from a base station and receiving a reference signal transmitted from the cell based on the measurement configuration information and measurement configuration information And measuring the cell search or channel state using the reference signal.
  • the cell refers to a cell using a frequency of the unlicensed band shared by one or more communication systems.
  • the terminal of the present invention receives measurement configuration information from the base station (S510).
  • the measurement configuration information includes information necessary for the UE to search for and measure an unlicensed band cell.
  • the measurement configuration information includes configuration information for measuring a reference signal transmitted in each of one or more cells using an unlicensed band frequency.
  • the measurement configuration information may include one or more of physical cell identifier information of each one or more cells, carrier frequency information, bandwidth information for measurement, subframe related information from which a reference signal is received, and type information of a reference signal. have.
  • the measurement configuration information may be received through the control channel common search space of the primary cell. That is, the base station may transmit information including information necessary for searching or measuring an unlicensed band cell through the primary cell of the terminal in measurement configuration information. In this case, the measurement configuration information may be transmitted on the control channel and allocated to the common search space.
  • the terminal includes receiving a reference signal transmitted from a cell based on the measurement configuration information (S520). That is, the terminal may receive the reference signal transmitted by the unlicensed band cell using the measurement configuration information received from the base station.
  • the reference signal may be received using information on the start time point at which the reference signal included in the measurement configuration information is transmitted.
  • the reference signal may be received by using information about the length of a continuous subframe in which the reference signal included in the measurement configuration information is transmitted.
  • the reference signal may be received using information on the type of the signal constituting the reference signal.
  • a specific operation of receiving a reference signal by the terminal using measurement configuration information will be described in detail below.
  • the terminal includes measuring a cell search or a channel state by using the measurement configuration information and the reference signal (S530).
  • the terminal may search for the channel of the unlicensed band cell by using the received measurement configuration information and the reference signal received through the unlicensed band and measure the channel state.
  • channel measurement may use a conventional RSRP or RSRQ measurement method.
  • the reference signal measurement configuration information signaled through the control channel (eg, PDCCH) common search space of the primary cell may include reference signal measurement configuration information of one or more unlicensed band cells.
  • the measurement configuration information includes a physical cell identifier (PCID) of each unlicensed band cell, carrier frequency related information configured with the corresponding unlicensed band cell, measurement bandwidth related information, a relative subframe offset value at which reference signal transmission starts, Information, such as the length of the reference signal (occasion) may be included.
  • the relation subframe offset value at which the reference signal transmission is started refers to the relation subframe offset value based on the downlink subframe of the primary cell in which the corresponding measurement configuration information transmission is performed.
  • the length of the reference signal opportunity means a corresponding N value when the reference signal is transmitted through consecutive N subframes.
  • the measurement configuration information is information indicating an type of a signal constituting the reference signal or a scrambling ID for generating the corresponding CSI-RS when the CSI-RS is used as a signal constituting the reference signal. ), CSI-RS RE configuration information, cover code information, and the like.
  • the reference signal may consist of PSS / SSS and CRS, or may consist of PSS / SSS, CRS, and CSI-RS.
  • the reference signal may be configured as a combination of other types of downlink reference signals.
  • FIG. 6 is a view for explaining the operation of the terminal according to another embodiment of the present invention.
  • the terminal may receive measurement configuration information including one or more reference signal format information through higher layer signaling (S610).
  • the terminal may store the received measurement configuration information, and thereafter, may indicate some of the reference signal format information included in the corresponding measurement configuration information or receive the indication information indicating the transmission of the reference signal (S620).
  • the indication information may be received through the control channel common search space of the aforementioned primary cell. Alternatively, the indication information may be received through the control channel terminal specific search space of the aforementioned primary cell.
  • a physical cell identifier (PCID) for each unlicensed band cell For each unlicensed band cell, carrier frequency related information in which a corresponding unlicensed band cell is configured, measurement bandwidth related information, information indicating a type of a signal constituting a reference signal, and a corresponding reference signal
  • PCID physical cell identifier
  • the CSI-RS is used as a signal
  • a scrambling ID, a CSI-RS RE configuration information, a cover code information, and the like for generating the corresponding CSI-RS
  • a reference signal format transmitted from an unlicensed band cell may be set in advance and transmitted to the terminal in advance through higher layer signaling (eg, RRC signaling).
  • each unlicensed band cell transmits a reference signal through the primary cell control channel common search space
  • only dynamic (or aperiodic) reference signal transmission indication information indicating this is transmitted through the corresponding control channel common search space.
  • the dynamic (or aperiodic) reference signal format for each unlicensed band cell is informed to the terminal in advance as measurement configuration information through higher layer signaling, and when the corresponding reference signal is transmitted in any unlicensed band cell, the previously transmitted measurement
  • information such as a physical cell identifier (PCID) of the unlicensed band cell to which a reference signal is transmitted, a relation subframe offset value, and a reference signal opportunity length may be transmitted to the terminal through corresponding indication information.
  • PCID physical cell identifier
  • the terminal may receive the reference time signal using the measurement configuration information and the indication information (S630).
  • the unlicensed band cell may be searched and the channel state may be measured (S640).
  • the above-described measurement configuration signal for the reference signal through the control channel common search space or indication information for the reference signal may include only some of the information described above.
  • the relation subframe offset value at which reference signal transmission is started, the length of the reference signal opportunity, etc. may be defined to have any fixed value without being included in the measurement configuration information.
  • the reference signal may be transmitted through all N subframes corresponding to the length of the reference signal opportunity, or the reference signal may be transmitted through some subframes.
  • a new RNTI value may be defined as the measurement configuration information-only RNTI or the indication information-only RNTI for the reference signal measurement configuration information or indication information through the control channel common search space described above.
  • the UE may be defined to perform blind decoding on measurement configuration information or indication information based on the corresponding RNTI.
  • Second embodiment Transmission of measurement configuration information through terminal specific search space of control channel
  • a terminal may receive the measurement configuration information through a control channel of the primary cell.
  • the measurement configuration information may be received through the terminal specific search space of the control channel.
  • the measurement configuration information signaled through the control channel USS of the corresponding primary cell may include measurement configuration information of one or more unlicensed band cells.
  • the measurement configuration information may include a physical cell identifier (PCID) of each unlicensed band cell, carrier frequency related information configured with the corresponding unlicensed band cell, measurement bandwidth related information, a relation subframe offset value at which reference signal transmission starts, and a reference. It may include at least one information of the length information of the signal opportunity.
  • PCID physical cell identifier
  • a UE-specific measurement configuration information can be transmitted by newly defining a DCI format for transmitting the corresponding measurement configuration information, scrambled the CI-RNTI of the corresponding UE and transmitting the same.
  • PCIDs physical configuration identifiers
  • carrier frequency related information in which the corresponding unlicensed band cells are configured are included in the measurement configuration information.
  • Information indicating the type of a signal to be configured a scrambling ID for generating the CSI-RS, a CSI-RS resource element configuration information, and a cover code when the CSI-RS is used as a signal constituting the reference signal
  • a reference signal format transmitted by each unlicensed band cell such as one or more pieces of information, may be preset, and may be transmitted to the terminal in advance through higher layer signaling.
  • only indication information indicating the reference signal may be transmitted through the corresponding control channel USS. That is, a non-licensed license in which a reference signal format for each unlicensed band cell is included in measurement configuration information and included in higher layer signaling to be transmitted to the terminal in advance, and when a reference signal is actually transmitted in an unlicensed band cell, preset reference signal transmission is performed. At least one of the physical cell identifier of the band cell, the relation subframe offset value at which the reference signal transmission starts, and the length of the reference signal opportunity may be transmitted to the terminal through the indication information.
  • the terminal may receive a reference signal by checking a reference signal format of a cell having a corresponding physical cell identifier from previously stored measurement configuration information using the received indication information.
  • a new DCI format for transmitting indication information is newly defined and scrambled by the C-RNTI of the corresponding UE to be transmitted, or the corresponding information region is additionally defined in the existing DL assignment DCI format or UL grant DCI format.
  • the indication information an indication bit of a bitmap scheme is allocated for each carrier frequency of an unlicensed band cell configured through a corresponding unlicensed band to a DL assignment DCI format or a UL grant DCI format. Through this, it may be defined to indicate whether reference signal transmission is performed in an unlicensed band cell configured through the corresponding band.
  • the relation subframe offset value at which reference signal transmission starts, the length of the reference signal opportunity, etc. may have any fixed value or may be semi-statically set through higher layer signaling as in the first embodiment. .
  • FIG. 7 is a view for explaining the operation of the base station according to another embodiment of the present invention.
  • a base station in a method for controlling channel measurement of a terminal, includes: generating measurement configuration information for cell discovery and measurement, transmitting measurement configuration information, and measurement configuration information and a cell; And receiving channel state measurement information measured on the basis of the transmitted reference signal from the terminal.
  • a cell refers to a cell using an unlicensed band frequency shared by one or more communication systems.
  • the base station of the present invention includes generating measurement configuration information for cell search and measurement (S710).
  • the measurement configuration information may include configuration information for measuring a reference signal transmitted in each of one or more cells using an unlicensed band frequency.
  • the measurement configuration information may include one or more of physical cell identifier information of each one or more cells, carrier frequency information, bandwidth information for measurement, subframe related information from which a reference signal is received, and type information of a reference signal. Can be.
  • the measurement configuration information may include a variety of information described in each of the above-described embodiments.
  • the base station includes the step of transmitting the measurement configuration information (S720).
  • the base station may transmit measurement configuration information through the control channel of the primary cell configured in the terminal.
  • the base station may transmit measurement configuration information through higher layer signaling.
  • the base station may transmit measurement configuration information through a common search space of the control channel as in the first embodiment.
  • the base station may transmit measurement configuration information through the terminal specific search space of the PDCCH or EPDCCH as in the second embodiment.
  • the base station can transmit the measurement configuration information to the terminal by scrambled using the C-RNTI of the terminal.
  • the base station includes the step of receiving the channel state measurement information measured on the basis of the measurement configuration information and the reference signal transmitted from the cell (S730).
  • FIG. 8 is a diagram for describing an operation of a base station according to another embodiment of the present invention.
  • a base station may transmit measurement configuration information through higher layer signaling.
  • the measurement configuration information includes reference signal format information of each of one or more unlicensed band cells.
  • the terminal may receive the reference signal using the reference signal format information for the corresponding unlicensed band cell.
  • the indication information may further include information for reception timing of the reference signal (eg, a relation subframe offset value, reference signal opportunity length information, etc.).
  • the base station includes generating measurement configuration information for searching and measuring a reference signal of an unlicensed band cell (S810).
  • the measurement configuration information includes a physical cell identifier (PCID) for each unlicensed band cell, carrier frequency related information in which a corresponding unlicensed band cell is configured, measurement bandwidth related information, and information indicating a type of a signal constituting a reference signal.
  • PCID physical cell identifier
  • a CSI-RS is used as a signal constituting the reference signal
  • a reference including at least one of a scrambling ID, a CSI-RS resource element configuration information, and cover code information for generating the corresponding CSI-RS. Contains signal format information.
  • the base station transmits the generated measurement configuration information to the terminal through higher layer signaling (S820).
  • the base station may transmit the measurement configuration information to higher layer signaling through the primary cell configured RRC connection to the terminal.
  • the base station may transmit the indication information when the reference signal is transmitted in the unlicensed band cell (S830).
  • the indication information may include information indicating that the reference signal is transmitted.
  • the indication information may include information indicating a specific reference signal format of the measurement configuration information or information related to the reception time of the reference signal as described above.
  • the base station may receive channel state measurement information from the terminal (S840).
  • the channel state measurement information may include state information about a channel measured by using a reference signal of an unlicensed band cell received by the terminal using measurement configuration information and indication information. Through this, the base station can determine whether the secondary cell of the unlicensed band cell is added or whether the unlicensed band cell added as the secondary cell is activated.
  • the present invention provides an effect of preventing interference of signals and transmitting a large amount of data at high speed when different wireless communication systems transmit and receive data using the same frequency band.
  • the present invention provides an effect that can prevent the terminal operation ambiguity when performing carrier aggregation using the unlicensed band frequency.
  • FIG. 9 is a diagram illustrating a terminal configuration according to another embodiment of the present invention.
  • a user terminal 900 includes a receiver 930, a controller 910, and a transmitter 920.
  • the terminal 900 of the present invention receives measurement configuration information for cell search and measurement from a base station, and receives a reception unit 930 for receiving a reference signal transmitted from a cell and measurement configuration information and a reference signal based on the measurement configuration information.
  • the controller 910 may measure a cell search or a channel state using the cell search.
  • the cell refers to a cell using a frequency of the unlicensed band shared by one or more communication systems.
  • the receiver 930 receives downlink control information, data, messages, and measurement configuration information from the base station.
  • the measurement configuration information may be received through the control channel common search space of the primary cell.
  • the measurement configuration information may be received through the control channel terminal specific search space of the primary cell.
  • the measurement configuration information may be received through higher layer signaling.
  • the receiver 930 may further receive indication information indicating a reference signal format included in the reception timing or measurement configuration information of the reference signal of the unlicensed band cell.
  • the control unit 910 controls the overall operation of the terminal for receiving the measurement configuration information or indication information required for carrying out the above-described invention, and the overall terminal in measuring the channel state using the reference signal of the unlicensed band cell Control the operation.
  • controller 910 controls the overall terminal operation according to the terminal operation of the present invention described with reference to FIGS. 1 to 8.
  • the transmitter 920 transmits uplink control information, data, and messages to the base station through a corresponding channel, and transmits a channel state measurement result.
  • FIG. 10 is a diagram showing a configuration of a base station according to another embodiment of the present invention.
  • the base station 1000 includes a controller 1010, a transmitter 1020, and a receiver 1030.
  • a base station includes a control unit 1010 for generating measurement configuration information for cell search and measurement, a transmitter 1020 for transmitting measurement configuration information, and measurement configuration information and a reference signal transmitted from a cell. And a receiver 1030 that receives the measured channel state measurement information from the terminal.
  • a cell refers to a cell using an unlicensed band frequency shared by one or more communication systems.
  • the controller 1010 generates measurement configuration information.
  • the measurement configuration information includes information necessary for the terminal to receive a reference signal transmitted from an unlicensed band cell.
  • the controller 1010 configures a carrier-merge cell of a licensed band and an unlicensed band necessary for carrying out the above-described present invention to a terminal, and controls the overall operation of the base station required to perform measurement configuration information generation and transmission. can do.
  • the transmitter 1020 transmits measurement configuration information.
  • the measurement configuration information may be transmitted through the control channel common search space of the primary cell.
  • the measurement configuration information may be transmitted through the control channel terminal specific search space of the primary cell.
  • the measurement configuration information may be transmitted through higher layer signaling.
  • the transmitter 1020 may further transmit indication information indicating a reference signal format included in the reference signal reception timing or measurement configuration information of the unlicensed band cell.
  • the receiver 1030 may receive channel state measurement result information transmitted from the terminal.
  • the transmitter 1020 and the receiver 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention described above.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de mesure de canal par un terminal et un dispositif associé. Plus particulièrement, la présente invention concerne un procédé et un dispositif pour détecter et mesurer un canal par l'intermédiaire d'un spectre non autorisé. En particulier, la présente invention concerne un procédé et un dispositif pour mesurer un canal par un terminal, le procédé comprenant les étapes consistant : à recevoir des informations de configuration de mesure pour une recherche et une mesure de cellule à partir d'une station de base ; à recevoir un signal de référence émis à partir d'une cellule sur la base des informations de configuration de mesure ; et à rechercher la cellule ou mesurer l'état de canal à l'aide des informations de configuration de mesure et du signal de référence, la cellule utilisant une fréquence d'un spectre non autorisé partagé par un ou plusieurs systèmes de communication.
PCT/KR2015/006291 2014-07-03 2015-06-22 Procédé de mesure de canal et dispositif associé WO2016003099A1 (fr)

Applications Claiming Priority (4)

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KR10-2014-0083295 2014-07-03
KR20140083295 2014-07-03
KR10-2015-0065259 2015-05-11
KR1020150065259A KR20160005307A (ko) 2014-07-03 2015-05-11 채널 측정 방법 및 그 장치

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