WO2011096744A2 - Procédé et appareil pour effectuer des mesures dans une porteuse d'extension - Google Patents

Procédé et appareil pour effectuer des mesures dans une porteuse d'extension Download PDF

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Publication number
WO2011096744A2
WO2011096744A2 PCT/KR2011/000748 KR2011000748W WO2011096744A2 WO 2011096744 A2 WO2011096744 A2 WO 2011096744A2 KR 2011000748 W KR2011000748 W KR 2011000748W WO 2011096744 A2 WO2011096744 A2 WO 2011096744A2
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WIPO (PCT)
Prior art keywords
control information
reference signal
message
component carrier
indicator
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PCT/KR2011/000748
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English (en)
Korean (ko)
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WO2011096744A3 (fr
Inventor
김소연
문성호
정재훈
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020110009784A external-priority patent/KR101461974B1/ko
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to US13/521,697 priority Critical patent/US9369882B2/en
Publication of WO2011096744A2 publication Critical patent/WO2011096744A2/fr
Publication of WO2011096744A3 publication Critical patent/WO2011096744A3/fr
Priority to US15/163,459 priority patent/US10306499B2/en
Priority to US16/385,887 priority patent/US10849003B2/en
Priority to US16/385,896 priority patent/US11026112B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters

Definitions

  • the present disclosure relates to wireless communications, and more particularly, to a method of performing measurements in an extended carrier and an apparatus using the same.
  • a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution, hereinafter referred to as 'LTE'), and an LTE-Advanced (hereinafter referred to as 'LTE-A') communication system are outlined.
  • 'LTE' 3rd Generation Partnership Project Long Term Evolution
  • 'LTE-A' LTE-Advanced
  • the cell is set to one of the bandwidth of 1.25MHz, 2.5MHz, 5MHz, 10MHz, 15MHz, 20MHz, etc. for one carrier to provide a downlink / uplink transmission service to multiple terminals. In this case, different cells may be configured to provide different bandwidths.
  • the base station controls data transmission and reception for a plurality of terminals.
  • the base station transmits downlink scheduling information on downlink data and informs a corresponding terminal of time / frequency domain, encoding, data size, and hybrid automatic repeat reQuest (HARQ) related information.
  • HARQ hybrid automatic repeat reQuest
  • the base station transmits uplink scheduling information to uplink (UL) data to the user equipment to inform the user of the time / frequency domain, encoding, data size, HARQ related information, etc. available to the user equipment.
  • uplink (UL) data to the user equipment to inform the user of the time / frequency domain, encoding, data size, HARQ related information, etc. available to the user equipment.
  • An interface for transmitting user traffic or control traffic may be used between base stations.
  • Wireless communication technology has been developed up to LTE based on Wideband Code Division Multiple Access (WCDMA), but the needs and expectations of users and operators continue to increase.
  • WCDMA Wideband Code Division Multiple Access
  • new technological evolution is required to be competitive in the future. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interface, and adequate power consumption of the terminal are required.
  • LTE-A LTE-A
  • One of the major differences between LTE and LTE-A systems is the difference in system bandwidth and the introduction of repeaters.
  • the LTE-A system aims to support broadband of up to 100 MHz, and for this purpose, a carrier aggregation (or carrier aggregation) or bandwidth aggregation technique that achieves broadband using a plurality of frequency blocks is achieved. I am going to use it. Carrier aggregation allows the use of multiple frequency blocks as one large logical frequency band to use a wider frequency band.
  • each frequency block may be defined based on the bandwidth of the system block used in the LTE system.
  • Each frequency block is transmitted using a component carrier (CC).
  • CC component carrier
  • the present specification is to provide a setting method for performing a measurement process on an extended component carrier and a measurement method of a terminal using the method in a wireless communication system using carrier aggregation.
  • the present specification provides a method of operating a terminal for performing channel quality measurement in a system supporting carrier bonding in order to solve the above problems.
  • the method includes receiving a first message from a base station including a first indicator indicating control information for channel quality measurement used in an extension component carrier; Receiving control information corresponding to the first indicator from the base station through the extended component carrier; And performing channel quality measurement on the extended component carrier using the received control information.
  • control information for measuring the channel quality may be any one of a common reference signal (CRS), a channel state indication reference signal (CSI-RS) and a synchronization channel (Synchronization Channel).
  • CRS common reference signal
  • CSI-RS channel state indication reference signal
  • Synchronization Channel Synchronization Channel
  • the first indicator may indicate any one of the control information for measuring the channel quality.
  • the first message may be any one of a physical downlink control channel (PDCCH), a radio resource control (RRC) signaling message, and a broadcast message.
  • PDCCH physical downlink control channel
  • RRC radio resource control
  • the first indicator may be transmitted every subframe.
  • the first indicator may be transmitted once or periodically after establishing an RRC connection.
  • the first indicator may be transmitted once after the RRC setting.
  • the method may further comprise receiving a second indicator indicating the location of the control information.
  • the first message may be a carrier configuration message for an extended component carrier.
  • the received control information is a reference signal density (RSD) is reduced in common It may be a reference signal (CRS) or a channel state indication reference signal (CSI-RS).
  • CRS common reference signal
  • CSI-RS channel state indication reference signal
  • the received control information is a common reference signal (CRS) of which the reference signal density of at least one of the first antenna and the second antenna is reduced. Can be.
  • the received control information may be a common reference signal (CRS) from which one of the first slot and the second slot is removed.
  • CRS common reference signal
  • the present disclosure provides a terminal for performing channel quality measurement in a system supporting carrier conjugation.
  • the terminal includes a memory; A wireless communication unit for transmitting and receiving an external signal and a wireless signal; And a first message including a first indicator indicating control information for measuring channel quality used in an extension component carrier from a base station, and receiving control information corresponding to the first indicator from the base station. It may include a control unit for receiving from the base station through the control, and performs a channel quality measurement in the extended component carrier using the received control information.
  • a terminal in a wireless communication system using carrier aggregation, may set control information for a measurement process in an extended component carrier. To this end, the terminal may receive information on the measurement method in the extended component carrier from the base station and perform the measurement accordingly.
  • the UE can improve the inefficiency due to the reference signal by performing the measurement in the extended component carrier using a reference signal with a reduced reference signal density.
  • FIG. 1 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same.
  • FIG. 2 is a diagram illustrating a structure of a radio frame used in a 3GPP LTE system as an example of a mobile communication system.
  • 3 is a diagram illustrating the structure of a downlink and uplink subframe in a 3GPP LTE system as an example of a mobile communication system.
  • FIG. 4 is a diagram illustrating a time-frequency resource grid structure of a downlink used in the present invention.
  • 5 is a block diagram showing the configuration of a PDCCH.
  • FIG. 6 shows an example of resource mapping of a PDCCH.
  • FIG. 8 is an exemplary diagram illustrating monitoring of a PDCCH.
  • FIG. 9A illustrates a concept of managing a multicarrier by a plurality of MACs in a base station
  • FIG. 9B illustrates a concept of managing a multicarrier by a plurality of MACs in a terminal.
  • FIG. 10A is a diagram for describing a concept of managing a multicarrier by one MAC in a base station
  • FIG. 10B is a diagram for explaining a concept of managing a multicarrier by one MAC in a terminal. .
  • FIG. 11 is a diagram illustrating component carriers (CCs) constituting downlink and uplink connecting to a terminal or a repeater in a base station or repeater area in an LTE-A system.
  • CCs component carriers
  • 12 and 13 illustrate a method in which a terminal performs channel quality measurement in a wireless communication system supporting carrier bonding according to an embodiment of the technology disclosed herein.
  • FIG. 14 is a block diagram illustrating a wireless communication system in accordance with an embodiment of the technology disclosed herein.
  • a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), and an advanced mobile station (AMS).
  • the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
  • the repeater may be referred to as a relay node (RN), a relay station (RS), a relay, or the like.
  • a terminal and a repeater may receive information from a base station via downlink, and the terminal and repeater may also transmit information through an uplink.
  • the information transmitted or received by the terminal and the repeater includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal and the repeater.
  • FIG. 1 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same.
  • the UE When the UE is powered on or enters a new cell, the UE performs an initial cell search operation such as synchronizing with the base station (S101). To this end, the terminal may receive a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station to synchronize with the base station and obtain information such as a cell ID. have. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the terminal may receive a downlink reference signal (DL RS) in an initial cell search step to check the downlink channel state.
  • P-SCH Primary Synchronization Channel
  • S-SCH Secondary Synchronization Channel
  • DL RS downlink reference signal
  • the UE After completing the initial cell search, the UE acquires more specific system information by receiving a physical downlink shared channel (PDSCH) according to a physical downlink control channel (PDCCH) and information on the PDCCH. It may be (S102).
  • PDSCH physical downlink shared channel
  • PDCCH physical downlink control channel
  • the terminal may perform a random access procedure (Random Access Procedure) for the base station (steps S103 to S106).
  • the UE may transmit a specific sequence as a preamble through a physical random access channel (PRACH) (S103 and S105), and receive a response message for the preamble through the PDCCH and the corresponding PDSCH ( S104 and S106).
  • PRACH physical random access channel
  • a contention resolution procedure may be additionally performed.
  • the UE After performing the procedure as described above, the UE performs a PDCCH / PDSCH reception (S107) and a physical uplink shared channel (PUSCH) / physical uplink control channel (Physical Uplink) as a general uplink / downlink signal transmission procedure.
  • Control Channel (PUCCH) transmission (S108) may be performed.
  • Information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station includes a downlink / uplink Acknowledgment / Negative-ACK (ACK / NACK) signal, a channel quality indicator (CQI), a precoding matrix index (PMI), RI (Rank Indicator) and the like.
  • the terminal may transmit the above-described information, such as CQI / PMI / RI through the PUSCH and / or PUCCH.
  • FIG. 2 is a diagram illustrating a structure of a radio frame used in a 3GPP LTE system as an example of a mobile communication system.
  • one radio frame has a length of 10 ms (307200 Ts) and consists of 10 equally sized subframes.
  • Each subframe has a length of 1 ms and consists of two slots.
  • Each slot has a length of 0.5 ms (15360 Ts).
  • the slot includes a plurality of OFDM symbols or SC-FDMA symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • one RB includes 12 subcarriers x 7 (6) Orthogonal Frequency Division Multiplexing (OFDM) symbols or a Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol.
  • Transmission time interval (TTI) which is a unit time for transmitting data, may be determined in units of one or more subframes.
  • the structure of the above-described radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe, the number of OFDM symbols or SC-FDMA symbols included in the slot may be variously changed. have.
  • 3 is a diagram illustrating the structure of a downlink and uplink subframe in a 3GPP LTE system as an example of a mobile communication system.
  • one downlink subframe includes two slots in the time domain. Up to three OFDM symbols in the first slot in the downlink subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which PDSCHs are allocated.
  • Downlink control channels used in 3GPP LTE systems include a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and a Physical Hybrid-ARQ Indicator Channel (PHICH).
  • the PCFICH transmitted in the first OFDM symbol of the subframe carries information about the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
  • Control information transmitted through the PDCCH is called downlink control information (DCI).
  • DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmission power control command for arbitrary UE groups.
  • the PHICH carries an ACK / NACK signal for an uplink hybrid automatic repeat request (HARQ). That is, the ACK / NACK signal for the uplink data transmitted by the terminal is transmitted on the PHICH.
  • HARQ uplink hybrid automatic repeat request
  • the PDCCH which is a downlink physical channel will be briefly described. A detailed description of the PDCCH will be described below with reference to FIGS. 5 to 8.
  • the base station sets a resource allocation and transmission format of the PDSCH (also referred to as a DL grant), a resource allocation information of the PUSCH (also referred to as a UL grant) through a PDCCH, a set of transmission power control commands for an arbitrary terminal and individual terminals in a group. And activation of Voice over Internet Protocol (VoIP).
  • a plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
  • the PDCCH consists of an aggregation of one or several consecutive Control Channel Elements (CCEs).
  • the PDCCH composed of one or several consecutive CCEs may be transmitted through the control region after subblock interleaving.
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of possible bits of the PDCCH are determined by the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • DCI Downlink control information
  • DCI format 0 indicates uplink resource allocation information
  • DCI formats 1 to 2 indicate downlink resource allocation information
  • DCI formats 3 and 3A indicate uplink transmit power control (TPC) commands for arbitrary UE groups. .
  • the base station may transmit scheduling assignment information and other control information through the PDCCH.
  • the physical control channel may be transmitted in one aggregation or a plurality of CCEs.
  • One CCE includes nine Resource Element Groups (REGs).
  • the number of RBGs not allocated to the Physical Control Format Indicator Channel (PCFICH) or the Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH) is N REG .
  • the available CCEs in the system are from 0 to N CCE -1 (where to be).
  • the PDCCH supports multiple formats as shown in Table 2 below.
  • the base station may determine the PDCCH format according to how many areas, such as control information, to send.
  • the UE may reduce overhead by reading control information in units of CCE.
  • the repeater can also read control information and the like in units of R-CCE.
  • a resource element RE
  • R-CCE relay-control channel element
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • the control region is allocated to a PUCCH carrying uplink control information.
  • the data area is allocated to a Physical Uplink Shared CHannel (PUSCH) for carrying user data.
  • PUSCH Physical Uplink Shared CHannel
  • PUCCH for one UE is allocated to an RB pair in one subframe. RBs belonging to the RB pair occupy different subcarriers in each of two slots. The RB pair assigned to the PUCCH is frequency hopped at the slot boundary.
  • FIG. 4 is a diagram illustrating a time-frequency resource grid structure of a downlink used in the present invention.
  • the downlink signal transmitted in each slot ⁇ Subcarriers and It is used as a resource grid structure composed of orthogonal frequency division multiplexing (OFDM) symbols.
  • OFDM orthogonal frequency division multiplexing
  • the size of depends on the downlink transmission bandwidth configured within the cell. Must be satisfied. here, Is the smallest downlink bandwidth supported by the wireless communication system. Is the largest downlink bandwidth supported by the wireless communication system.
  • the number of OFDM symbols included in one slot may vary depending on the length of a cyclic prefix (CP) and the interval of subcarriers.
  • CP cyclic prefix
  • one resource grid may be defined per one antenna port.
  • Each element in the resource grid for each antenna port is called a resource element (RE) and is uniquely identified by an index pair (k, l) in the slot.
  • k is the index in the frequency domain
  • l is the index in the time domain
  • k is 0, ...
  • Has any one of the values l is 0, ..., It has any one of -1.
  • the resource block shown in FIG. 4 is used to describe a mapping relationship between certain physical channels and resource elements.
  • the RB may be divided into a physical resource block (PRB) and a virtual resource block (VRB).
  • PRB physical resource block
  • VRB virtual resource block
  • the one PRB is a time domain Contiguous OFDM symbols and frequency domain It is defined as two consecutive subcarriers. here and May be a predetermined value. E.g and Can be given as Table 3 below. So one PRB ⁇ It consists of four resource elements.
  • One PRB may correspond to one slot in the time domain and 180 kHz in the frequency domain, but is not limited thereto.
  • PRB is at 0 in the frequency domain It has a value up to -1.
  • the relation between the PRB number nPRB in the frequency domain and the resource element (k, l) in one slot is Satisfies.
  • the size of the VRB is equal to the size of the PRB.
  • the VRB may be defined by being divided into a localized VRB (LVRB) and a distributed VRB (DVRB). For each type of VRB, a pair of VRBs in two slots in one subframe are assigned together a single VRB number n VRBs .
  • the VRB may have the same size as the PRB.
  • Two types of VRBs are defined, the first type being a localized VRB (LVRB) and the second type being a distributed VRB (DVRB).
  • LVRB localized VRB
  • DVRB distributed VRB
  • a pair of VRBs are allocated over two slots of one subframe with a single VRB index (hereinafter may also be referred to as VRB number).
  • VRB number belonging to the first slot of the two slots constituting one subframe VRBs from 0 each Is assigned an index of any one of -1, and belongs to the second one of the two slots VRBs likewise start with 0
  • the index of any one of -1 is allocated.
  • the radio frame structure, the downlink subframe and the uplink subframe, and the downlink time-frequency resource lattice structure described in FIGS. 2 to 4 may also be applied between the base station and the repeater.
  • 5 is a block diagram showing the configuration of a PDCCH.
  • the base station determines the PDCCH format according to the DCI to be sent to the terminal, attaches a cyclic redundancy check (CRC) to the DCI, and unique identifier according to the owner or purpose of the PDCCH (this is called a Radio Network Temporary Identifier) Mask the CRC (510).
  • CRC cyclic redundancy check
  • a unique identifier of the terminal for example, a C-RNTI (Cell-RNTI) may be masked to the CRC.
  • a paging indication identifier for example, P-RNTI (P-RNTI)
  • P-RNTI P-RNTI
  • SI-RNTI system information-RNTI
  • RARNTI random access-RNTI
  • TPC-RNTI may be masked to the CRC to indicate a transmit power control (TPC) command for a plurality of terminals.
  • the PDCCH carries control information for the corresponding specific UE (called UE-specific control information), and if another RNTI is used, the PDCCH is shared by all or a plurality of terminals in the cell. (common) carries control information.
  • the DCC added with the CRC is encoded to generate coded data (520).
  • Encoding includes channel encoding and rate matching.
  • the coded data is modulated to generate modulation symbols (530).
  • the modulation symbols are mapped to a physical resource element (RE) (540). Each modulation symbol is mapped to an RE.
  • RE physical resource element
  • FIG. 6 shows an example of resource mapping of a PDCCH.
  • R0 represents a reference signal of the first antenna
  • R1 represents a reference signal of the second antenna
  • R2 represents a reference signal of the third antenna
  • R3 represents a reference signal of the fourth antenna.
  • the control region in the subframe includes a plurality of control channel elements (CCEs).
  • the CCE is a logical allocation unit used to provide a coding rate according to the state of a radio channel to a PDCCH and corresponds to a plurality of resource element groups (REGs).
  • the REG includes a plurality of resource elements.
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • One REG (denoted as quadruplet in the figure) contains four REs and one CCE contains nine REGs.
  • ⁇ 1, 2, 4, 8 ⁇ CCEs may be used to configure one PDCCH, and each element of ⁇ 1, 2, 4, 8 ⁇ is called a CCE aggregation level.
  • a control channel composed of one or more CCEs performs interleaving in units of REGs and is mapped to physical resources after a cyclic shift based on a cell ID.
  • a plurality of logically continuous CCEs are input to an interleaver.
  • the interleaver performs a function of mixing input CCEs in REG units.
  • frequency / time resources constituting one CCE are physically dispersed in the entire frequency / time domain in the control region of the subframe.
  • the control channel is configured in units of CCE, but interleaving is performed in units of REGs, thereby maximizing frequency diversity and interference randomization gain.
  • FIG. 8 is an exemplary diagram illustrating monitoring of a PDCCH.
  • blind decoding is used to detect the PDCCH.
  • Blind decoding is a method of demasking a desired identifier in a CRC of a received PDCCH (which is called a PDCCH candidate), and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
  • the UE does not know where its PDCCH is transmitted using which CCE aggregation level or DCI format at which position in the control region.
  • a plurality of PDCCHs may be transmitted in one subframe.
  • the UE monitors the plurality of PDCCHs in every subframe.
  • the monitoring means that the UE attempts to decode the PDCCH according to the monitored PDCCH format.
  • a search space is used to reduce the burden of blind decoding.
  • the search space may be referred to as a monitoring set of the CCE for the PDCCH.
  • the UE monitors the PDCCH in the corresponding search space.
  • the search space is divided into a common search space and a UE-specific search space.
  • the common search space is a space for searching for a PDCCH having common control information.
  • the common search space includes 16 CCEs up to CCE indexes 0 to 15 and supports a PDCCH having a CCE aggregation level of ⁇ 4, 8 ⁇ .
  • PDCCHs (DCI formats 0 and 1A) carrying UE specific information may also be transmitted in the common search space.
  • the UE-specific search space supports a PDCCH having a CCE aggregation level of ⁇ 1, 2, 4, 8 ⁇ .
  • Table 4 below shows the number of PDCCH candidates monitored by the UE.
  • the size of the search space is determined by Table 4, and the starting point of the search space is defined differently from the common search space and the terminal specific search space.
  • the starting point of the common search space is fixed irrespective of the subframe, but the starting point of the UE-specific search space is for each subframe according to the terminal identifier (eg, C-RNTI), the CCE aggregation level and / or the slot number in the radio frame. Can vary.
  • the terminal specific search space and the common search space may overlap.
  • the search space S (L) k is defined as a set of PDCCH candidates.
  • the CCE corresponding to the PDCCH candidate m of the search space S (L) k is given as follows.
  • N CCE, k can be used for transmission of the PDCCH in the control region of subframe k.
  • the control region includes a set of CCEs numbered from 0 to N CCE, k ⁇ 1.
  • M (L) is the number of PDCCH candidates at CCE aggregation level L in a given search space.
  • the variable Y k is defined as follows.
  • n s is a slot number in a radio frame.
  • a DCI format and a search space to be monitored are determined according to a transmission mode of the PDSCH.
  • Table 5 below shows an example of PDCCH monitoring configured with C-RNTI.
  • the 3GPP LTE system supports a case in which the downlink bandwidth and the uplink bandwidth are set differently, but this assumes one component carrier (CC).
  • CC component carrier
  • 3GPP LTE is supported only when the bandwidth of the downlink and the bandwidth of the uplink are the same or different in a situation where one CC is defined for each of the downlink and the uplink.
  • the 3GPP LTE system supports up to 20MHz and may have different uplink bandwidth and downlink bandwidth, but only one CC is supported for the uplink and the downlink.
  • Spectrum aggregation (or bandwidth aggregation, also known as carrier aggregation) is to support a plurality of CCs.
  • Spectral consolidation is introduced to support increased throughput, to prevent cost increases due to the introduction of wideband radio frequency (RF) devices, and to ensure compatibility with existing systems. For example, if five CCs are allocated as granularity in a carrier unit having a 20 MHz bandwidth, a bandwidth of up to 100 MHz may be supported.
  • RF radio frequency
  • Spectral merging can be divided into contiguous spectral merging where merging is performed between successive carriers in the frequency domain and non-contiguous spectral merging where merging is made between discontinuous carriers.
  • the number of CCs merged between the downlink and the uplink may be set differently. The case where the number of downlink CCs and the number of uplink CCs is the same is called symmetric merging.
  • Another case is called asymmetric merging.
  • the downlink component carrier and the uplink component carrier may be collectively referred to as a 'cell'. That is, 'cell' may be used as a concept for a pair of DL CC and UL CC.
  • 'cell' should be distinguished from the term 'cell' as an area covered by a generally used base station.
  • the size (ie bandwidth) of the CC may be different. For example, assuming that 5 CCs are used to configure a 70 MHz band, a 5 MHz carrier (CC # 0) + 20 MHz carrier (CC # 1) + 20 MHz carrier (CC # 2) + 20 MHz carrier (CC # 3) It may also be configured as a + 5MHz carrier (CC # 4).
  • PHY physical layer
  • MAC layer 2
  • FIG. 9A illustrates a concept of managing multiple carriers by multiple MACs in a base station
  • FIG. 9B illustrates a concept of managing multiple carriers by multiple MACs in a terminal.
  • each carrier may control 1: 1 by each MAC.
  • each carrier may be used contiguously or non-contiguous. This may be applied to the uplink / downlink without distinction.
  • the TDD system is configured to operate N multiple carriers including transmission of downlink and uplink in each carrier, and the FDD system is configured to use multiple carriers for uplink and downlink, respectively.
  • the number of carriers merged in the uplink and the downlink and / or the bandwidth of the carrier may also support asymmetrical carrier aggregation.
  • FIG. 10A is a diagram for describing a concept of managing a multicarrier by one MAC in a base station
  • FIG. 10B is a diagram for explaining a concept of managing a multicarrier by one MAC in a terminal. .
  • one MAC manages and operates one or more frequency carriers to perform transmission and reception. Frequency carriers managed in one MAC do not need to be contiguous with each other, which is advantageous in terms of resource management.
  • one PHY means one component carrier for convenience.
  • one PHY does not necessarily mean an independent radio frequency (RF) device.
  • RF radio frequency
  • one independent RF device means one PHY, but is not limited thereto, and one RF device may include several PHYs.
  • channel, PDCCH may be transmitted by mapping to a physical resource in an individual component carrier.
  • the PDCCH for channel allocation or grant-related control information related to PDSCH or PUSCH (physical uplink shared channel) transmission which is unique to an individual UE, is divided and encoded according to component carriers to which the corresponding physical shared channel is transmitted. Can be generated as This is referred to as separate coded PDCCH.
  • control information for physical shared channel transmission of various component carriers may be configured and transmitted as one PDCCH, which is referred to as a joint coded PDCCH.
  • a base station In order to support downlink or uplink carrier aggregation, a base station is configured such that a PDCCH and / or PDSCH for transmitting control information and / or data transmission can be transmitted uniquely for a specific terminal or repeater, or the PDCCH And / or component carriers that are subject to measurement and / or reporting as preparation for performing connection establishment for PDSCH transmission. This is expressed as component carrier allocation for any purpose.
  • the base station controls the component carrier allocation information in the L3 RRM (radio resource management)
  • the RRC signaling terminal-specific or repeater-specific RRC signaling
  • the base station controls the component carrier allocation information in the L3 RRM (radio resource management)
  • the RRC signaling terminal-specific or repeater-specific RRC signaling
  • the base station controls the component carrier allocation information in the L3 RRM (radio resource management)
  • the RRC signaling terminal-specific or repeater-specific RRC signaling
  • the base station controls the component carrier allocation information in the L3 RRM (radio resource management)
  • the RRC signaling terminal-specific or repeater-specific RRC signaling
  • dynamic dynamic
  • a method of establishing timing synchronization between a plurality of carriers when a cell supports multiple carriers in a wireless communication system will be described.
  • a subframe boundary setting between carriers is disclosed in particular in operation of a cell and a terminal supporting carrier aggregation in an LTE-A system.
  • LTE-A system Although described in the present specification based on the LTE-A system, it can be applied to other wireless communication standards that can apply the same concept.
  • FIG. 11 is a diagram illustrating component carriers (CCs) constituting downlink and uplink connecting to a terminal or a repeater in a base station or repeater area in an LTE-A system.
  • CCs component carriers
  • DL CCs basic downlink component carriers
  • UL CCs uplink component carriers allocated to any base station or any repeater are illustrated.
  • the number of downlink component carriers is set to N and the number of uplink component carriers is set to M.
  • the number of downlink component carriers may be the same as the number of uplink component carriers, but may be set differently.
  • a downlink component carrier may be classified into three types.
  • As a first type component carrier there is a backward compatible CC supporting backward compatibility for LTE rel-8 terminal.
  • As the second type component carrier there is a non-backward compatible CC that LTE terminals cannot connect to, i.e., support only LTE-A terminals.
  • extension component carrier extension CC
  • extension CC extension component carrier
  • the backward compatible CC which is a first type component carrier, may use not only a PDCCH and a PDSCH but also a reference signal (RS) and a primary-synchronization channel (P-SCH) / S- to enable connection of an LTE terminal.
  • RS reference signal
  • P-SCH primary-synchronization channel
  • S- secondary-Synchronization CHannel
  • P-BCH Primary-Broadcast CHannel
  • the non-backward compatible CC which is a second type component carrier, performs all of the PDCCH, PDSCH, RS, P-SCH / S-SCH, and PBCH transmissions, but is modified to prevent connection of the LTE terminal.
  • Component carrier that is transmitted in the form.
  • the first type component carrier ie, backward compatible component carrier
  • the first type component carrier is a component carrier capable of accessing a cell (or base station) through a corresponding component carrier for both the LTE terminal and the LTE-A terminal.
  • the extended component carrier which is the third type component carrier, may be referred to as an auxiliary component carrier of the first type component carrier or the second type component carrier as a component carrier which the terminal cannot access through the corresponding component carrier.
  • the extended component carrier which is the third type component carrier
  • transmission of P-SCH / S-SCH, PBCH, and PDCCH is not performed, and all resources of the third type component carrier are used for PDSCH transmission of the UE or for the corresponding PDSCH.
  • it may be operated in a sleep mode.
  • the base station or repeater does not transmit control information to the terminal through the third type component carrier.
  • the first type component carrier and the second type component carrier may be referred to as a standalone component carrier type that is essential for forming one cell or may constitute one cell. May be referred to as a non-standalone component carrier type that must be present with at least one standalone component carrier.
  • RS reference signals
  • Various types of reference signals may be used according to the definition of each subframe. RS is divided into demodulation and measurement, depending on the application.
  • the demodulation RS is basically used for receiving data in a multiple input multiple output (MIMO) system. In this case, it is desirable that the RS always be transmitted with the data, and it is important to design the RS to have high channel estimation performance. Do.
  • MIMO multiple input multiple output
  • the measurement RS may be used for feedback of channel information for link adaptation.
  • Measurement RS can be used to calculate Channel Quality Indicator (CQI), Precoding Matrix Index (PMI), Rank Information (RI), etc.In this case, there is no problem even if RS is transmitted according to the period of channel information feedback.
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Index
  • RI Rank Information
  • the RS for operation can operate without problems even with a low channel estimation performance compared to the RS for demodulation.
  • the RS may be classified into a common reference signal (CRS), a dedicated reference signal (DRS), and a combined RS combined with the CRS and the DRS according to a type.
  • CRS common reference signal
  • DRS dedicated reference signal
  • the terminal measures the CRS and informs the base station of feedback information such as channel quality information (CQI), a peding matrix indicator (PMI), and a rank indicator (RI), and the base station uses the feedback information received from the terminal to downlink frequency domain Perform scheduling.
  • CQI channel quality information
  • PMI peding matrix indicator
  • RI rank indicator
  • CRS can be used for both demodulation and measurement purposes.
  • CRS and CSI-RS may be used for measurement, and DM RS (DeModulation RS) may be used for demodulation.
  • CSI-RS Channel State Indication RS
  • DM RS DeModulation RS
  • a terminal using carrier aggregation may be allocated one or more component carriers from a base station.
  • the component carrier assigned to the terminal includes an extension component carrier (extension CC) which is a third type component carrier, the terminal should also perform measurement for the extension component carrier.
  • all of the CRS, CSI-RS, and SCH may be used for measurement of the UE.
  • the CRS is used for the measurement in the extended component carrier, unnecessary processing may increase due to the RS for measurement.
  • the SCH is used for the measurement, whether the SCH is a SCH defined in LTE or a newly defined SCH. Depending on whether or not the access of the terminal supporting each may be difficult.
  • the base station can set the control information to be used for measurement purposes in a specific extended component carrier in order to reduce the inefficiency of resource utilization, wasteful processing and increase the efficiency of the measurement. have.
  • 12 and 13 illustrate a method in which a terminal performs channel quality measurement in a wireless communication system supporting carrier bonding according to an embodiment of the technology disclosed herein.
  • the terminal should set what control information to use for measurement in the extended component carrier.
  • the base station transmits an indicator indicating one of the control information that can be used for the configuration of the terminal to the terminal.
  • the terminal may check the received indicator, and then receive control information indicated by the indicator to perform a measurement process.
  • the base station transmits to the terminal a first message including an indicator indicating control information to be used for measurement in the extended component carrier (S10).
  • the first message including the indicator indicating the control information may be transmitted for each subframe so that the UE can determine which control information to use for each subframe and dynamically set the measurement method.
  • the first message may also be transmitted periodically or event-driven.
  • the control information indicated by the indicator indicates a means for measurement in the extended component carrier, and may be one of a common reference signal (CRS), a channel state indication reference signal (CSI-RS), and a synchronization channel (SCH).
  • CRS common reference signal
  • CSI-RS channel state indication reference signal
  • SCH synchronization channel
  • the terminal receiving the first message including the indicator indicating the control information checks the indicator and accordingly performs a setting process for the measurement in the extended component carrier (S20).
  • the setting process is a process of preparing to receive the control information indicated by the indicator.
  • the base station transmits control information for measurement in the extended component carrier to the terminal (S30), the terminal receiving the control information performs the measurement process (S40) and the measurement results to the base station through the feedback information It transmits (S50).
  • the first message including the indicator indicating the control information may be a PDCCH which is L1 control signaling.
  • the base station may instruct the terminal to dynamically set the measurement method every subframe by including an indicator of control information for measurement in the PDCCH of each subframe to be transmitted.
  • the base station may transmit an indicator indicating control information to the terminal using an upper layer signaling message.
  • the first message transmitted by including the indicator may be, for example, an RRC signaling message, and the base station uses the RRC signaling message once or after a specific period after the RRC connection is established.
  • the terminal may instruct the terminal to set the measurement method by transmitting the indicator of the control information for measurement.
  • the first message including the indicator indicating the control information may be a broadcast message.
  • the base station may instruct the terminal to set the measurement method by transmitting an indicator of the control information for measurement using a broadcast message while the RRC connection is established.
  • the control information used for the measurement in the extended component carrier is basically defined between the base station and the terminal, it is intended to change the basic configuration
  • the base station may transmit the indicator by using an L1 control signaling message or an upper layer signaling message.
  • the base station may transmit the first message including the indicator periodically or when an event occurs.
  • the base station receives the control information for setting the measurement method in the extended component carrier through a message used in the cell-specific carrier configuration for the extended component carrier. You can send an indicator to indicate.
  • the base station transmits a first message including an indicator of control information for measurement in the extended component carrier to the terminal (S10) and then indicates the location of the control information.
  • a second message including a second indicator may be additionally transmitted to the terminal (S25).
  • the terminal receiving the second message may check the second indicator to check the position of the control information to obtain control information for measurement.
  • the second indicator may indicate which subframe transmits the CRS used for the measurement in the extended component carrier or which subframe the CSI-RI is to be used.
  • the second message including the second indicator may be transmitted periodically.
  • the base station when the base station transmits an indicator indicating a common reference signal (CRS) or a channel state indication reference signal (CSI-RS) as control information for channel measurement to the terminal, subsequent control information is received.
  • CRS common reference signal
  • CSI-RS channel state indication reference signal
  • the base station may transmit control information by reducing the reference signal density (RSD). That is, the base station transmits to the terminal an indicator indicating the use of the reduced reference signal density in the first message transmission step (S10), the common reference signal (CRS) in which the reference signal density is reduced in the control information transmission step (S30) ) Or a channel state indication reference signal (CSI-RS).
  • the control information for reducing the reference signal density may be to use some of the CRS pattern or the CSI-RS pattern of LTE for use for measurement purposes.
  • the base station is configured to reduce the reference signal density.
  • the CRS having the reduced density of the antenna may be transmitted to the terminal.
  • the base station since the CRS exists over the entire time and frequency domain of the subframe, the base station may transmit the CRS from which the first slot or the second slot is removed to reduce the reference signal density.
  • CSI-RS channel state indication reference signal
  • the wireless communication system 1400 may include a base station 1410 and a terminal 1420.
  • the base station 1410 includes a controller 1411, a memory 1412, and a radio frequency unit (RF) unit 1413.
  • RF radio frequency unit
  • the controller 1411 implements the proposed function, process and / or method. Layers of the air interface protocol may be implemented by the controller 1411.
  • the controller 1411 may instruct to operate a multi-carrier and to configure an extended component carrier.
  • the memory 1412 is connected to the controller 1411 and stores protocols or parameters for multi-carrier operation.
  • the RF unit 1413 is connected to the control unit 1411 and transmits and / or receives a radio signal.
  • the terminal 1420 includes a controller 1421, a memory 1422, and a radio communication (RF) unit 1423.
  • RF radio communication
  • the controller 1421 implements the proposed function, process, and / or method. Layers of the air interface protocol may be implemented by the controller 1421.
  • the controller 1421 operates a multi-carrier and performs measurement in an extended component carrier.
  • the memory 1412 is connected to the controller 1421 and stores protocols or parameters for multi-carrier operation.
  • the RF unit 1413 is connected to the control unit 1421 and transmits and / or receives a radio signal.
  • the controllers 1411 and 1421 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device.
  • Memory 1412 and 1422 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.
  • the RF unit 1413 and 1423 may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in the memories 1412 and 1422 and executed by the controllers 1411 and 1421.
  • the memories 1412 and 1422 may be inside or outside the controllers 1411 and 1421 and may be connected to the controllers 1411 and 1421 through various well-known means.

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

Abstract

L'invention concerne un procédé dans lequel un terminal effectue une mesure de qualité canal dans un système qui supporte une agrégation de porteuses, lequel comprend les étapes suivantes : recevoir d'une station de base un premier message contenant un premier indicateur pour indiquer des informations de commande pour une mesure de qualité canal utilisée dans une porteuse de composante d'extension ; recevoir des informations de commande correspondant au premier indicateur depuis la station de base et via la porteuse de composante d'extension ; et effectuer une mesure de qualité canal dans la porteuse de composante d'extension en utilisant les informations de commande reçues.
PCT/KR2011/000748 2010-02-02 2011-02-01 Procédé et appareil pour effectuer des mesures dans une porteuse d'extension WO2011096744A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US13/521,697 US9369882B2 (en) 2010-02-02 2011-02-01 Method and apparatus for performing measurement in an extension carrier
US15/163,459 US10306499B2 (en) 2010-02-02 2016-05-24 Method and apparatus for performing measurement in an extension carrier
US16/385,887 US10849003B2 (en) 2010-02-02 2019-04-16 Method and apparatus for performing measurement in an extension carrier
US16/385,896 US11026112B2 (en) 2010-02-02 2019-04-16 Method and apparatus for performing measurement in an extension carrier

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US30044610P 2010-02-02 2010-02-02
US61/300,446 2010-02-02
KR10-2011-0009784 2011-01-31
KR1020110009784A KR101461974B1 (ko) 2010-02-02 2011-01-31 확장 캐리어에서의 측정 수행 방법 및 장치

Related Child Applications (2)

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US13/521,697 A-371-Of-International US9369882B2 (en) 2010-02-02 2011-02-01 Method and apparatus for performing measurement in an extension carrier
US15/163,459 Continuation US10306499B2 (en) 2010-02-02 2016-05-24 Method and apparatus for performing measurement in an extension carrier

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Publication number Priority date Publication date Assignee Title
CN104221455A (zh) * 2012-03-30 2014-12-17 株式会社Ntt都科摩 无线通信方法、无线基站、用户终端以及无线通信系统
CN103379556A (zh) * 2012-04-12 2013-10-30 电信科学技术研究院 一种移动性测量的方法及装置
CN103379556B (zh) * 2012-04-12 2016-05-25 电信科学技术研究院 一种移动性测量的方法及装置
WO2013183933A1 (fr) * 2012-06-05 2013-12-12 Samsung Electronics Co., Ltd. Sondage de canal de liaison montante et estimation d'informations d'état de canal dans des systèmes de communication mobile avec de multiples antennes
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JP2016506188A (ja) * 2013-01-04 2016-02-25 富士通株式会社 チャネル測定方法、チャネル測定の構成方法及び装置
US20180077706A1 (en) * 2013-02-22 2018-03-15 Huawei Technologies Co., Ltd. Method and device for generating subframe, method for determining subframe and user equipment
CN109687950A (zh) * 2014-03-31 2019-04-26 上海朗帛通信技术有限公司 非授权频带上的传输方法和装置

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