WO2013019046A2 - 무선 접속 시스템에서 채널 품질 측정 방법 및 이를 위한 장치 - Google Patents
무선 접속 시스템에서 채널 품질 측정 방법 및 이를 위한 장치 Download PDFInfo
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- WO2013019046A2 WO2013019046A2 PCT/KR2012/006057 KR2012006057W WO2013019046A2 WO 2013019046 A2 WO2013019046 A2 WO 2013019046A2 KR 2012006057 W KR2012006057 W KR 2012006057W WO 2013019046 A2 WO2013019046 A2 WO 2013019046A2
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
Definitions
- the present invention relates to a wireless access system, and more particularly, to a method for measuring channel quality using a downlink reference signal and an apparatus for supporting the same.
- Mobile communication systems have been developed to provide voice services while ensuring user activity.
- mobile communication systems are gradually expanding not only voice but also data services, and now they have developed to the extent that they can provide high-speed data services.
- a shortage of resources and users demand faster services, and thus, a more advanced mobile communication system is required.
- MIMO Multiple Input Multiple Output
- CoMP Cooperative Multiple Point Transmission
- Relay Relay
- the application of heterogeneous networks composed of Macro-Pico or Macro-Femto is expanding to accommodate explosive wireless data demand.
- the pico cell or femto cell is located in the macro cell, and in this situation, the terminal located at the boundary of the overlapping cells causes a problem that signals transmitted from each cell act by interfering with each other.
- An object of the present invention is to propose a method and an apparatus therefor for effectively measuring channel quality by a terminal in a wireless access system, preferably a heterogeneous network system.
- Another object of the present invention is to provide a method and apparatus for measuring RSRP (Reference Signal Received Power) to RSRQ (Referential Signal Quality) in heterogeneous network system.
- each cell is transmitted from a base station in a 0, 4, 7, 11th Orthogonal Frequency Division Multiplexing (OFDM) symbol of each subframe Measuring channel quality using a cell-specific reference signal (CRS), wherein the channel quality measurement in the 0th OFDM symbol is in advance of the average value of the channel quality measurements in the 4th, 7th, and 11th OFDM symbols And determining channel quality information to the base station, wherein the channel quality information includes a channel quality measurement of the 0th OFDM symbol as the 4th, 7th, 11th OFDM symbol. If not greater than the first threshold than the average of the channel quality measurements, then the average of the channel quality measurements in the 0, 4, 7, 11th OFDM symbol.
- OFDM Orthogonal Frequency Division Multiplexing
- a radio frequency (RF) unit for transmitting and receiving a radio signal and a 0, 4, 7, 11th OFDM symbol of each subframe from a base station Channel quality is measured using each transmitted CRS, and whether the channel quality measurement value in the 0th OFDM symbol is equal to or greater than a first threshold value preset than the average value of the channel quality measurement values in the 4th, 7th, and 11th OFDM symbols.
- a processor for transmitting the channel quality information to the base station, wherein the channel quality information in the 0th OFDM symbol is greater than the average value of the channel quality measurements in the 4th, 7th, and 11th OFDM symbols. If not greater than the first threshold, this is the average of the channel quality measurements in the 0, 4, 7, 11th OFDM symbols.
- the channel in the 4th, 7th and 11th OFDM symbols when the channel quality measurement in the 0th OFDM symbol is greater than or equal to the first threshold than the average of the channel quality measurements in the 4th, 7th and 11th OFDM symbols. It is determined whether the average value of the quality measurements is greater than or equal to a second preset threshold, and the channel quality information is 0 when the average value of the channel quality measurements in the 4th, 7th, and 11th OFDM symbols is smaller than the second threshold.
- Channel quality measurement value in the first OFDM symbol is determined whether the average value of the quality measurements is greater than or equal to a second preset threshold, and the channel quality information is 0 when the average value of the channel quality measurements in the 4th, 7th, and 11th OFDM symbols is smaller than the second threshold.
- the form of the subframe of the cell in which the UE measures the channel quality is a multicast broadcast single frequency network (MBSFN) sub It is determined whether the frame is, and the channel quality information is an average value of the channel quality measurement values in the 4th, 7th, and 11th OFDM symbols when the subframe type of the cell measuring the channel quality is not the MBSFN subframe.
- MBSFN multicast broadcast single frequency network
- the channel quality information is, when the subframe of the cell measuring the channel quality is MBSFN subframe, the channel quality measurement in the 4, 7, 11 OFDM symbol in the channel quality measurement in the 0 th OFDM symbol This value is the average of the values.
- the channel quality information is at least one of RSRP and RSRQ.
- a terminal in a wireless access system, preferably, a heterogeneous network system, can effectively measure channel quality.
- RSRP to RSRQ measurement can be effectively performed.
- the terminal effectively measures the channel quality, it is possible to improve call quality and expand the capacity of the overall system.
- FIG. 1 is a diagram for explaining physical channels used in a 3GPP LTE system and a general signal transmission method using the same.
- FIG. 2 shows a structure of a radio frame in 3GPP LTE.
- 3 is a diagram illustrating a resource grid for one downlink slot.
- 5 shows a structure of an uplink subframe.
- FIG. 6 illustrates a reference signal pattern mapped to a downlink resource block (RB) pair defined in a 3GPP LTE system.
- RB downlink resource block
- FIG. 7 illustrates ABS patterns of a macro cell and a pico cell in a system to which eICIC is applied.
- FIG. 8 is a diagram illustrating a measurement signal of the terminal in a system to which eICIC is applied.
- FIG 9 illustrates a method for measuring channel quality according to blind detection according to an embodiment of the present invention.
- FIG. 10 illustrates a block diagram of a wireless communication device according to an embodiment of the present invention.
- the base station has a meaning as a terminal node of the network that directly communicates with the terminal.
- the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
- a 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point (AP), and the like.
- the repeater may be replaced by terms such as relay node (RN) and relay station (RS).
- terminal may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), a subscriber station (SS), and a station (STA).
- UE user equipment
- MS mobile station
- MSS mobile subscriber station
- SS subscriber station
- STA station
- Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE and LTE-Advanced (LTE-A) system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
- LTE-A Advanced is the evolution of 3GPP LTE.
- FIG. 1 is a diagram for explaining physical channels used in a 3GPP LTE system and a general signal transmission method using the same.
- the initial cell search operation such as synchronizing with the base station is performed in step S11.
- the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a cell ID.
- P-SCH Primary Synchronization Channel
- S-SCH Secondary Synchronization Channel
- the terminal may receive a physical broadcast channel (PBCH) signal from the base station to obtain broadcast information in a cell.
- PBCH physical broadcast channel
- the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to confirm the downlink channel state.
- DL RS downlink reference signal
- the UE After completing the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the physical downlink control channel information in step S12. Specific system information can be obtained.
- PDCCH physical downlink control channel
- PDSCH physical downlink control channel
- the terminal may perform a random access procedure as in steps S13 to S16 to complete the access to the base station.
- the UE transmits a preamble through a physical random access channel (PRACH) (S13), a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel. Can be received (S14).
- PRACH physical random access channel
- the UE may perform contention resolution such as transmitting an additional physical random access channel signal (S15) and receiving a physical downlink control channel signal and a corresponding physical downlink shared channel signal (S16). Procedure).
- the UE After performing the above-described procedure, the UE subsequently receives a physical downlink control channel signal and / or a physical downlink shared channel signal (S17) and a physical uplink shared channel (PUSCH) as a general uplink / downlink signal transmission procedure.
- a transmission (Uplink Shared Channel) signal and / or a Physical Uplink Control Channel (PUCCH) signal may be transmitted (S18).
- UCI uplink control information
- HARQ-ACK / NACK Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK
- SR Scheduling Request
- CQI Channel Quality Indication
- PMI Precoding Matrix Indication
- RI Rank Indication
- UCI is generally transmitted periodically through the PUCCH, but may be transmitted through the PUSCH when control information and traffic data should be transmitted at the same time.
- the UCI may be aperiodically transmitted through the PUSCH by the request / instruction of the network.
- FIG. 2 shows a structure of a radio frame in 3GPP LTE.
- uplink / downlink data packet transmission is performed in subframe units, and one subframe is defined as a predetermined time interval including a plurality of OFDM symbols.
- the 3GPP LTE standard supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).
- the downlink radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain.
- the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
- TTI transmission time interval
- one subframe may have a length of 1 ms
- one slot may have a length of 0.5 ms.
- One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. Since 3GPP LTE uses OFDMA in downlink, the OFDM symbol is for representing one symbol period. The OFDM symbol may be referred to as one SC-FDMA symbol or symbol period.
- a resource block (RB) as a resource allocation unit includes a plurality of consecutive subcarriers in one slot.
- the number of OFDM symbols included in one slot may vary depending on the configuration of a cyclic prefix (CP).
- the CP has an extended CP and a normal CP.
- the number of OFDM symbols included in one slot may be seven.
- the OFDM symbol is configured by the extended cyclic prefix, the length of one OFDM symbol is increased, so the number of OFDM symbols included in one slot is smaller than that of the normal cyclic prefix.
- the extended cyclic prefix for example, the number of OFDM symbols included in one slot may be six.
- the extended cyclic prefix may be used to further reduce the interference between symbols.
- one slot includes 7 OFDM symbols, so one subframe includes 14 OFDM symbols.
- the first up to three OFDM symbols of each subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).
- PDCCH physical downlink control channel
- PDSCH physical downlink shared channel
- Type 2 radio frames consist of two half frames, each of which has five subframes, a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
- DwPTS downlink pilot time slot
- GP guard period
- UpPTS uplink pilot time slot
- One subframe consists of two slots.
- DwPTS is used for initial cell search, synchronization, or channel estimation at the terminal.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
- the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- the structure of the radio frame described above is just one example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of symbols included in the slot may be variously changed.
- 3 is a diagram illustrating a resource grid for one downlink slot.
- one downlink slot includes a plurality of OFDM symbols in the time domain.
- one downlink slot includes seven OFDM symbols, and one resource block includes 12 subcarriers in a frequency domain, but is not limited thereto.
- Each element on the resource grid is a resource element, and one resource block includes 12 ⁇ 7 resource elements.
- the number NDL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.
- the structure of the uplink slot may be the same as the structure of the downlink slot.
- up to three OFDM symbols in the first slot in a subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which a Physical Downlink Shared Channel (PDSCH) is allocated. data region).
- a downlink control channel used in 3GPP LTE includes a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid-ARQ indicator channel (PHICH), and the like.
- the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size of the control region) used for transmission of control channels within the subframe.
- the PHICH is a response channel for the uplink and carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for a hybrid automatic repeat request (HARQ).
- Control information transmitted through the PDCCH is called downlink control information (DCI).
- the downlink control information includes uplink resource allocation information, downlink resource allocation information or an uplink transmission (Tx) power control command for a certain terminal group.
- the PDCCH is a resource allocation and transmission format of DL-SCH (Downlink Shared Channel) (also referred to as a downlink grant), resource allocation information of UL-SCH (Uplink Shared Channel) (also called an uplink grant), and PCH ( Paging information in paging channel, system information in DL-SCH, resource allocation for upper-layer control message such as random access response transmitted in PDSCH, arbitrary terminal
- DL-SCH Downlink Shared Channel
- UL-SCH Uplink Shared Channel
- PCH Paging information in paging channel, system information in DL-SCH, resource allocation for upper-layer control message such as random access response transmitted in PDSCH, arbitrary terminal
- a set of transmission power control commands for individual terminals in a group, activation of voice over IP (VoIP), and the like may be carried.
- the plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
- the PDCCH consists of a set of one or a pluralit
- CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to the state of a radio channel.
- the CCE corresponds to a plurality of resource element groups.
- the format of the PDCCH and the number of available bits of the PDCCH are determined according to the association between the number of CCEs and the coding rate provided by the CCEs.
- the base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information.
- the CRC is masked with a unique identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or purpose of the PDCCH.
- RNTI Radio Network Temporary Identifier
- 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) may be masked to the CRC.
- the system information more specifically, the PDCCH for the system information block (SIB), the system information identifier and the system information RNTI (SI-RNTI) may be masked to the CRC.
- SI-RNTI system information RNTI
- RA-RNTI random access-RNTI
- 5 shows a structure of an uplink subframe.
- an uplink subframe may be divided into a control region and a data region in the frequency domain.
- a physical uplink control channel (PUCCH) carrying uplink control information is allocated to the control region.
- the data region is allocated a Physical Uplink Shared Channel (PUSCH) that carries user data.
- PUCCH Physical Uplink Shared Channel
- a PUCCH for one UE is allocated a resource block (RB) pair in a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the two slots. This RB pair allocated to the PUCCH is said to be frequency hopping at the slot boundary (slot boundary).
- data / signals in a wireless communication system are transmitted over wireless channels
- data / signals may be distorted over the air during transmission.
- the distorted signal is preferably corrected using the channel information.
- the transmitting end and / or the receiving end may use a reference signal RS that is known to both sides to detect channel information.
- the reference signal may be called a pilot signal.
- each transmitting antenna of the transmitting end preferably has a separate reference signal.
- the downlink reference signal includes a common reference signal (CRS: Common RS) shared by all terminals in one cell and a dedicated reference signal (DRS: Dedicated RS) only for a specific terminal.
- the transmitter may provide the receiver with information for demodulation and channel measurement using the reference signals CRS and DRS.
- the receiving end measures the channel state using the CRS, and according to the measured channel state, channel quality such as a channel quality indicator (CQI), a precoding matrix index (PMI), and / or a rank indicator (RI) May be fed back to the transmitter (eg, the base station).
- channel quality such as a channel quality indicator (CQI), a precoding matrix index (PMI), and / or a rank indicator (RI) May be fed back to the transmitter (eg, the base station).
- the CRS is also called a cell-specific RS.
- the reference signal associated with the feedback of the channel state information (CSI) may be defined as CSI-RS.
- the DRS may be transmitted to terminals through resource elements when data demodulation on the PDSCH is needed.
- the terminal may receive the presence or absence of the DRS through higher layer signaling.
- the DRS is valid only when the corresponding PDSCH signal is mapped.
- the DRS may be referred to as a UE-specific RS or a demodulation RS (DMRS).
- FIG. 6 is a diagram illustrating an example of a reference signal pattern mapped to a downlink resource block (RB) pair defined in a 3GPP LTE system.
- RB downlink resource block
- a downlink resource block (RB) pair may be configured as one subframe in the time domain and 12 subcarriers in the frequency domain. That is, one resource block pair on the time axis (x-axis) has a length of 14 OFDM symbols in the case of a normal cyclic prefix (CP) (see FIG. 6 (a)), and an extended cyclic prefix In the case of CP ((Cyclic Prefix)), it has a length of 12 OFDM symbols (see FIG. 6B).
- CP normal cyclic prefix
- the resource elements REs denoted by '0', '1', '2' and '3' in each resource block are the antenna ports' 0 ',' CRSs corresponding to 1 ',' 2 ', and' 3 'are mapped to resource elements, and resource elements described as' D' refer to resource elements to which the DRS is mapped.
- the CRS is a reference signal that can be commonly received by all terminals located in a cell, and is distributed in all frequency bands and can be used to estimate a channel of a physical antenna.
- the CRS may be used for channel quality information (CSI) and data demodulation.
- CSI channel quality information
- the CRS may be defined in various formats according to the antenna arrangement at the transmitting end (eg, base station).
- a transmitting end may support up to four transmit antennas.
- the reference signal is transmitted through specific resource elements in accordance with a predetermined pattern.
- the reference signal for the other antenna port is not transmitted in the resource element through which the reference signal for one antenna port is transmitted. That is, reference signals between different antennas do not overlap each other.
- Heterogeneous network / deployments refers to a structure in which micro cells for low power / near-field communication are mixed in a homogeneous network based on a macro cell.
- the micro cell may be referred to as a pico cell, a femto cell, a Hom evolved Node B (HNB), a relay, etc., but is generally referred to as a micro cell for convenience of description.
- HNB Hom evolved Node B
- Macro cell refers to a typical cell (or base station) of a wireless communication system having wide coverage and high transmit power.
- the micro cell or micro base station
- the micro cell is a small version of the macro cell, and can operate independently while performing most of the functions of the macro cell. It refers to a cell (or base station) of a non-overlay type. Microcells can accommodate fewer terminals with narrower coverage and lower transmit power than macrocells.
- the terminal may be served directly from the macro cell or may be served from the micro cell. Also, in some cases, a terminal existing within the coverage of the micro cell may be served from the macro cell.
- the micro cell may be classified into two types according to access restriction of the terminal.
- the first type is a CSG (Closed Subscriber Group) cell, and means a cell that does not allow access of an existing macro terminal (terminal served by a macro cell) or another micro terminal (terminal served by a micro cell) without authentication.
- the second type is an Open Access Subscriber Group (OASC) or Open Subscriber Group (OSC) cell, and means a cell that allows access of an existing macro terminal or other micro terminals.
- OASC Open Access Subscriber Group
- OSC Open Subscriber Group
- RSRP reference signal received power
- RSRQ reference signal received quality
- the interfering cell is called an attacker cell or a primary cell, respectively, and the interfering cell is defined as a victim cell or a secondary cell, and in a specific subframe, An attacker cell or a primary cell stops data transmission so that the terminal can maintain a connection with a victim cell or a secondary cell in a corresponding subframe. That is, when the macro cell and the micro cell coexist, one base station temporarily stops transmitting a signal to a terminal that receives a significantly high interference in a certain area so that the terminal rarely transmits an interference signal. RSRP / RSRQ measurement is performed on the signal of the base station.
- a cell-specific reference signal (CRS) signal is transmitted on the 0, 4, 7, and 11th OFDM symbols in each subframe on the time axis, which is used for RSRP and RSRQ.
- CRS cell-specific reference signal
- the terminal measures RSRP and RSRQ by using the CRS received from the macro cell and the micro cell, respectively. For example, if the serving cell of the terminal corresponds to the macro cell and the micro cell corresponds to the neighbor cell, the terminal measures the RSRP and RSRQ of the serving cell through the CRS from the macro cell, and through the CRS from the micro cell Measure RSRP and RSRQ of the neighbor cell.
- the macro cell provides a subframe called ABS (or ABSF: Almost Blank Subframe) to a terminal served from the micro cell, especially a terminal located at the boundary of the overlapped cell, and in the ABSF, any downlink control channel except the CRS is provided. And by not transmitting the data channel can be protected from strong interference resulting from the macro cell.
- ABS or ABSF: Almost Blank Subframe
- the CRS is not transmitted in the data area of the ABS. That is, in the case of the MBSFN ABS subframe, the CRS is removed except for the first CRS (CRS transmitted in the 0th OFDM symbol), so that the CRS is included in the 4, 7, 11 OFDM symbol intervals including the remaining CRS except the first CRS. Interference between the liver can be excluded.
- MBSFN multicast broadcast single frequency network
- the shape of the subframe of each base station can be known by exchanging signals through the X2 interface connection between the macro cell and the pico cell.
- a macro cell or a pico cell exchanges information on an MBSFN subframe and information on a subframe operating with ABS through X2 interface-based signaling.
- the predefined ABS pattern is applied to the femto cell by setting through OAM (Operation, Administration and Maintenance).
- OAM Operaation, Administration and Maintenance
- the femto cell receives system information broadcasted wirelessly from the macro cell to obtain MBSFN subframe information, or obtains the macro from the control station of the core network. MBSFN subframe information of the cell may be obtained.
- FIG. 7 illustrates ABS patterns of a macro cell and a pico cell in a system to which eICIC is applied.
- four cases may exist according to a signal transmission pattern between two base stations when eICIC is applied.
- FIG. 7A illustrates a case of normal ABS with colliding CRS in which a collided CRS exists. That is, when both the macro cell and pico cell subframes are normal subframes, the CRS position of the macro cell and the pico cell's CRS are all the same. The performance is greatly degraded.
- FIG. 7B illustrates a case of a normal ABS with non-colliding CRS in which there is no collision CRS. That is, when both the macro cell and pico cell subframes are normal subframes, the CRS position of the macro cell and the CRS position of the pico cell are all different, and there is no interference effect between the CRSs.
- FIG. 7C illustrates a case of MBSFN ABS with colliding CRS in which a collided CRS exists. That is, when the type of the subframe of the macro cell is the MBSFN subframe and the type of the subframe of the pico cell is the normal subframe, it indicates that the CRS transmitted in the 0th symbol is the same position. Since the subframe of the macro cell is an MBSFN subframe, the CRS of the macro cell does not exist in the remaining 4th, 7th and 11th symbols, but CRSs transmitted through the 0th symbol are overlapped to act as interference.
- FIG. 7D illustrates a case of MBSFN ABS with non-colliding CRS in which there is no collision CRS.
- the subframe of the macro cell is an MBSFN subframe and the subframe of the pico cell is a general subframe, this indicates a case where the CRS transmitted in the 0 th symbol is another position. Since the subframe of the macro cell is an MBSFN subframe, the CRS of the macro cell does not exist in the remaining 4th, 7th, and 11th symbols, and the location of the CRS transmitted through the 0th symbol is different, so that there is no interference effect between the CRSs. Do not.
- the UE uses all CRSs regardless of whether the CRS interferes with the neighboring cells. You will perform a / RSRQ measurement.
- the UE performs RSRP / RSRQ measurement because the CRS is transmitted only in the first OFDM symbol of each subframe in the MBSFN subframe of the neighbor cell. In this case, RSRP / RSRQ measurement should be performed using only the first CRS of each slot.
- the UE can know whether the subframe of the current serving cell is a normal subframe or an MBSFN subframe, but whether the neighbor cell is an MBSFN subframe. As such, since the UE does not know the neighbor cell in which the MBSFN subframe is transmitted, the accuracy of the measurement may be degraded.
- each subband type of a cell to be measured (hereinafter referred to as a measurement cell) and an adjacent cell (hereinafter referred to as an interference cell) that interfere with each other exist.
- the cases can be divided as follows:
- FIG. 8 is a diagram illustrating a measurement signal of the terminal in a system to which eICIC is applied.
- each bar graph shown in FIG. 8 represents the position of the OFDM symbol in which the CRS is transmitted in the corresponding subframe, and the size on the vertical axis of each bar graph represents the received power of the CRS.
- the amount of change in the time axis of the path loss affecting the received power of the CRS can be said to be substantially constant in the corresponding subframe.
- the measurement cell is referred to as C Normal or C MBSFN
- the interference according to the subframe type (normal subframe or MBSFN subframe) of the interfering cell is referred to as I Normal or I MBSFN
- the bar bars indicated by hatched lines in FIG. 8 represent CRSs transmitted in the corresponding subframe of the measurement cell
- the bar bars indicated by dots represent the CRS transmitted in the corresponding subframe of the interfering cell.
- the CRS exists in the 0, 4, 7, and 11th OFDM symbols, respectively, but when the eICIC is applied, in the MBSFN ABS subframe, the CRS is present only in the first OFDM symbol. CRS is not transmitted in the 4th, 7th, and 11th OFDM symbols.
- Cases 1a, 1b, and 1c illustrate a case in which a subframe of a measurement cell corresponds to a general subframe, and CRSs are transmitted in 0, 4, 7, and 11th OFDM symbols of the subframe of the measurement cell.
- Case 1a represents the case where there is no interference signal from the interfering cell.
- Case 1b represents a case in which an interference signal exists in all of the 0, 4, 7, and 11th OFDM symbols because the subframe of the interfering cell also corresponds to a normal subframe.
- Case 1c shows a case in which a subframe of an interfering cell exists only in the 0th OFDM symbol corresponding to the MBSFN subframe.
- cases 2a, 2b, and 2c illustrate a case in which the subframe of the measurement cell corresponds to the MBSFN subframe, and the CRS is transmitted only in the 0th OFDM symbol of the subframe of the measurement cell.
- Case 2a represents a case where there is no interference signal from the interfering cell.
- Case 2b shows a case in which a subframe of an interfering cell corresponds to a general subframe and an interference signal exists in all of 0, 4, 7 and 11th OFDM symbols.
- Case 2c shows a case in which an interference signal exists only in a 0 th OFDM symbol in a subframe of an interfering cell also corresponds to an MBSFN subframe.
- FIG 9 illustrates a method for measuring channel quality according to blind detection according to an embodiment of the present invention.
- Q l is an instantaneous value for channel quality estimated (or measured) in the l-th OFDM symbol
- step S907 the UE determines that all cells are MBSFN subframes and selects Q 0 as Q Valid (S909). That is, the UE determines the case 2a or 2b in FIG. 8 and reports an estimate of the 0 th OFDM symbol to the base station (or network).
- step S907 the UE determines that the common subframe and the MBSFN ABS subframe are mixed in the measurement cell and the interference cell, and the measurement cell It is determined whether it is a normal subframe (S911). That is, since the normal subframe and the MBSFN ABS subframe are mixed in the interference with the measurement cell, and the UE knows whether the subframe is a normal subframe or an MBSFN subframe with respect to the serving cell, the serving cell subframe type The shape of the subframe of the measurement cell can be known.
- the subframe of the serving cell may be determined to be the same as the subframe of the serving cell.
- the subframe of the measurement cell may be determined as the MBSFN subframe, and the subframe of the serving cell is the MBSFN subframe. If it is a frame, the subframe of the measurement cell may be determined as a normal subframe.
- the UE can estimate whether the subframe of the neighbor cell is the MBSFN subframe, and thus can effectively measure the RSRP / RSRQ of the cell to be measured. Furthermore, in the wireless access system with eICIC technology, the call quality can be improved and the overall system capacity can be increased.
- FIG. 10 illustrates a block diagram of a wireless communication device according to an embodiment of the present invention.
- the wireless communication system includes a base station 100 and a plurality of terminals 110 located in an area of the base station 100.
- the base station 100 includes a processor 101, a memory 102, and a radio frequency unit 103.
- the processor 101 implements the proposed functions, processes and / or methods. Layers of the air interface protocol may be implemented by the processor 101.
- the memory 102 is connected to the processor 101 and stores various information for driving the processor 101.
- the RF unit 103 is connected to the processor 101 and transmits and / or receives a radio signal.
- the terminal 110 includes a processor 111, a memory 112, and an RF unit 113.
- the processor 111 implements the proposed functions, processes and / or methods. Layers of the air interface protocol may be implemented by the processor 111.
- the memory 112 is connected to the processor 111 and stores various information for driving the processor 111.
- the RF unit 113 is connected to the processor 111 and transmits and / or receives a radio signal.
- the memories 102 and 112 may be inside or outside the processors 101 and 111, and may be connected to the processors 101 and 111 by various well-known means.
- the base station 100 and / or the terminal 110 may have a single antenna or multiple antennas.
- each component or feature is to be considered optional unless stated otherwise.
- Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
- Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
- the software code may be stored in memory and driven by the processor.
- the memory may be located inside or outside the processor, and may exchange data with the processor by various known means.
- the data transmission / reception scheme in the wireless access system of the present invention has been described with reference to the example applied to the 3GPP LTE system, but can be applied to various wireless access systems.
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Abstract
Description
Claims (10)
- 무선 접속 시스템에서 단말이 채널 품질을 측정하는 방법에 있어서,기지국으로부터 각 서브프레임의 0, 4, 7, 11 번째 OFDM(Orthogonal Frequency Division Multiplexing) 심볼에서 전송되는 각 셀 특정 참조 신호(CRS: Cell-specific Reference Signal)를 이용하여 상기 채널 품질을 측정하는 단계;상기 0 번째 OFDM 심볼에서의 채널 품질 측정값이 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값보다 미리 설정된 제1 임계값 이상인지 여부를 판단하는 단계; 및채널 품질 정보를 상기 기지국에 전송하는 단계를 포함하되,상기 채널 품질 정보는, 상기 0 번째 OFDM 심볼에서의 채널 품질 측정값이 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값보다 상기 제1 임계값 이상 크지 않은 경우, 상기 0, 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값인, 채널 품질 측정 방법.
- 제1항에 있어서,상기 0번째 OFDM 심볼에서의 채널 품질 측정값이 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값보다 상기 제1 임계값 이상 큰 경우, 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값이 미리 설정된 제2 임계값 이상인지 여부를 판단하는 단계를 더 포함하고,상기 채널 품질 정보는, 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값이 상기 제2 임계값보다 작은 경우, 상기 0 번째 OFDM 심볼에서의 채널 품질 측정값인, 채널 품질 측정 방법.
- 제2항에 있어서,상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값이 상기 제2 임계값 이상인 경우, 상기 단말이 상기 채널 품질을 측정하는 셀의 서브프레임의 형태가 MBSFN(Multicast Broadcast Single Frequency Network) 서브프레임인지 여부를 판단하는 단계를 더 포함하고,상기 채널 품질 정보는, 상기 채널 품질을 측정하는 셀의 서브프레임의 형태가 MBSFN 서브프레임이 아닌 경우, 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값인, 채널 품질 측정 방법.
- 제3항에 있어서,상기 채널 품질 정보는, 상기 채널 품질을 측정하는 셀의 서브프레임의 형태가 MBSFN 서브프레임인 경우, 상기 0 번째 OFDM 심볼에서의 채널 품질 측정값에서 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값을 차감한 값인, 채널 품질 측정 방법.
- 제1항에 있어서,상기 채널 품질 정보는 RSRP(Reference Signal Received Power) 및 RSRQ(Reference Signal Received Quality) 중 적어도 어느 하나인, 채널 품질 측정 방법.
- 무선 접속 시스템에서 채널 품질을 측정하는 단말에 있어서,무선 신호를 송수신하기 위한 RF(Radio Frequency) 유닛; 및기지국으로부터 각 서브프레임의 0, 4, 7, 11 번째 OFDM(Orthogonal Frequency Division Multiplexing) 심볼에서 전송되는 각 셀 특정 참조 신호(CRS: Cell-specific Reference Signal)를 이용하여 상기 채널 품질을 측정하고, 상기 0 번째 OFDM 심볼에서의 채널 품질 측정값이 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값보다 미리 설정된 제1 임계값 이상인지 여부를 판단하며, 채널 품질 정보를 상기 기지국에 전송하는 프로세서를 포함하되,상기 채널 품질 정보는, 상기 0 번째 OFDM 심볼에서의 채널 품질 측정값이 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값보다 상기 제1 임계값 이상 크지 않은 경우, 상기 0, 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값인, 단말.
- 제6항에 있어서, 상기 프로세서는,상기 0번째 OFDM 심볼에서의 채널 품질 측정값이 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값보다 상기 제1 임계값 이상 큰 경우, 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값이 미리 설정된 제2 임계값 이상인지 여부를 판단하고,상기 채널 품질 정보는, 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값이 상기 제2 임계값보다 작은 경우, 상기 0 번째 OFDM 심볼에서의 채널 품질 측정값인, 단말.
- 제7항에 있어서, 상기 프로세서는,상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값이 상기 제2 임계값 이상인 경우, 상기 단말이 상기 채널 품질을 측정하는 셀의 서브프레임의 형태가 MBSFN(Multicast Broadcast Single Frequency Network) 서브프레임인지 여부를 판단하고,상기 채널 품질 정보는, 상기 채널 품질을 측정하는 셀의 서브프레임의 형태가 MBSFN 서브프레임이 아닌 경우, 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값인, 단말.
- 제8항에 있어서,상기 채널 품질 정보는, 상기 채널 품질을 측정하는 셀의 서브프레임의 형태가 MBSFN 서브프레임인 경우, 상기 0 번째 OFDM 심볼에서의 채널 품질 측정값에서 상기 4, 7, 11 번째 OFDM 심볼에서의 채널 품질 측정값들의 평균값을 차감한 값인, 단말.
- 제6항에 있어서,상기 채널 품질 정보는 RSRP(Reference Signal Received Power) 및 RSRQ(Reference Signal Received Quality) 중 적어도 어느 하나인, 단말.
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WO2015012663A1 (ko) * | 2013-07-26 | 2015-01-29 | 삼성전자 주식회사 | 무선 통신 시스템에서 채널 품질 정보 송수신 방법 및 장치 |
CN105532058A (zh) * | 2013-09-07 | 2016-04-27 | 高通股份有限公司 | 对于网络定位参考信号(prs)配置参数的盲搜索 |
WO2017026798A1 (ko) * | 2015-08-12 | 2017-02-16 | 주식회사 윌러스표준기술연구소 | 비면허 대역에서 제어 채널 전송 방법, 장치 및 시스템 |
US10616906B2 (en) | 2015-08-12 | 2020-04-07 | Wilus Institute Of Standards And Technology Inc. | Method, apparatus, and system for transmitting control channel in unlicensed band |
US11229037B2 (en) | 2015-08-12 | 2022-01-18 | Beijing Xiaomi Mobile Software Co., Ltd. | Method, apparatus, and system for transmitting control channel in unlicensed band |
Also Published As
Publication number | Publication date |
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US9210606B2 (en) | 2015-12-08 |
US20140086095A1 (en) | 2014-03-27 |
KR20140044322A (ko) | 2014-04-14 |
WO2013019046A3 (ko) | 2013-03-07 |
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