WO2013042883A1 - 무선 통신 시스템에서 링크 품질을 측정하는 방법 이를 위한 장치 - Google Patents
무선 통신 시스템에서 링크 품질을 측정하는 방법 이를 위한 장치 Download PDFInfo
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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
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0056—Inter-base station aspects
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- 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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- 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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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- 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
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method for measuring link quality in a wireless communication system.
- a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (LTE)) communication system will be described.
- E-UMTS Evolved Universal Mobile Telecommunications System
- UMTS Universal Mobile Telecommunications System
- LTE Long Term Evolution
- an E-UMTS is an access gateway (AG) located at an end of a user equipment (UE) and a base station (eNode B), an eNB, and a network (E-UTRAN) and connected to an external network.
- the base station may transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.
- the cell is set to one of bandwidths such as 1.25, 2.5, 5, 10, 15, and 20Mhz to provide downlink or uplink transmission services to multiple terminals. 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 for downlink (DL) data and informs the user equipment of time / frequency domain, encoding, data size, and HARQ (Hybrid Automatic Repeat and reQuest) related information.
- HARQ Hybrid Automatic Repeat and reQuest
- the base station transmits uplink scheduling information to uplink UL data for uplink (UL) data and informs the user equipment of time / frequency domain, encoding, data size, HARQ related information, and the like.
- the core network may be composed of an AG and a network node for user registration of the terminal.
- the AG manages the mobility of the UE in units of a tracking area (TA) composed of a plurality of cells.
- Wireless communication technology has been developed to LTE based on WCDMA, but the demands and expectations of users and operators are continuously increasing.
- 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.
- a method for reporting downlink link quality by a terminal includes: receiving, from a serving cell, information about a subframe set for resource-limited measurement and a cell specific reference signal of an interfering cell; Measuring downlink quality in the subframe set; And reporting the measured downlink quality to a serving cell, wherein, in the subframe set, information on a cell specific reference signal of the interfering cell is generated by a cell specific reference signal from the interfering cell. Applying interference control processing.
- the subframe included in the subframe set is characterized in that the ABS (Almost Blank Subframe) or ABS (Multicast broadcast single frequency network).
- the measuring of the downlink link quality may include measuring the downlink link quality under the assumption that interference by the cell specific reference signal from the interfering cell is removed.
- the downlink link quality includes first information and second information corresponding to the first information, and when the second information is transmitted a plurality of times between transmission periods of the first information,
- the subframe for measuring the first information and the subframe for measuring the second information may be assumed to belong to the subframe set.
- the first information may be a rank indicator (RI)
- the second information may include at least one of a precoding matrix index (PMI) and a channel quality indicator (CQI).
- the information on the subframe set is received through a Radio Resource Control (RRC) layer.
- RRC Radio Resource Control
- a terminal apparatus in a wireless communication system includes: a receiving module for receiving information about a cell specific reference signal of an interference cell and a subframe set for resource-limited measurement from a serving cell; A processor for measuring downlink quality in the subframe set; And a transmitting module for reporting the measured downlink quality to a serving cell, wherein the processor is further configured to, in the subframe set, use information about a cell specific reference signal of the interfering cell from the interfering cell. Applying interference control processing by the cell specific reference signal.
- a terminal in a wireless communication system, can effectively measure and report link quality to a base station.
- FIG. 1 is a diagram schematically illustrating an E-UMTS network structure as an example of a wireless communication system.
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
- FIG. 3 is a diagram for describing physical channels used in a 3GPP system and a general signal transmission method using the same.
- FIG. 4 is a diagram illustrating a structure of a radio frame used in an LTE system.
- FIG. 5 is a diagram illustrating a structure of a downlink radio frame used in an LTE system.
- FIG. 6 is a diagram illustrating a situation in which dominant interference exists.
- 7A and 7B are diagrams for explaining a difference depending on whether ABS is configured as an MBSFN subframe.
- FIG. 8 illustrates an example of comparing the influence of inter-cell interference on each code block when one transport block is divided into a plurality of code blocks.
- FIG. 9 is a diagram illustrating a method for calculating CSI by a UE according to an embodiment of the present invention.
- FIG. 10 illustrates an example of setting reference resources for PMI / CQI reporting in order to maintain consistency between RI and PMI / CQI reporting according to an embodiment of the present invention.
- FIG. 11 illustrates a block diagram of a communication device according to an embodiment of the present invention.
- the present specification describes an embodiment of the present invention using an LTE system and an LTE-A system, this as an example may be applied to any communication system corresponding to the above definition.
- the present specification describes an embodiment of the present invention on the basis of the frequency division duplex (FDD) method, but the embodiment of the present invention as an example is easily modified in the H-FDD method or the time division duplex (TDD) method. Can be applied.
- FDD frequency division duplex
- TDD time division duplex
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
- the control plane refers to a path through which control messages used by a user equipment (UE) and a network to manage a call are transmitted.
- the user plane refers to a path through which data generated at an application layer, for example, voice data or Internet packet data, is transmitted.
- the physical layer which is the first layer, provides an information transfer service to an upper layer by using a physical channel.
- the physical layer is connected to the upper layer of the medium access control layer through a transport channel. Data moves between the medium access control layer and the physical layer through the transport channel. Data moves between the physical layer between the transmitting side and the receiving side through the physical channel.
- the physical channel utilizes time and frequency as radio resources. Specifically, the physical channel is modulated in the Orthogonal Frequency Division Multiple Access (OFDMA) scheme in the downlink, and modulated in the Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme in the uplink.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the medium access control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
- RLC radio link control
- the RLC layer of the second layer supports reliable data transmission.
- the function of the RLC layer may be implemented as a functional block inside the MAC.
- the PDCP (Packet Data Convergence Protocol) layer of the second layer performs a header compression function to reduce unnecessary control information for efficiently transmitting IP packets such as IPv4 or IPv6 in a narrow bandwidth wireless interface.
- IPv4 Packet Data Convergence Protocol
- the Radio Resource Control (RRC) layer located at the bottom of the third layer is defined only in the control plane.
- the RRC layer is responsible for control of logical channels, transport channels, and physical channels in connection with configuration, reconfiguration, and release of radio bearers (RBs).
- RB means a service provided by the second layer for data transmission between the terminal and the network.
- the RRC layers of the UE and the network exchange RRC messages with each other. If there is an RRC connected (RRC Connected) between the UE and the RRC layer of the network, the UE is in an RRC connected mode, otherwise it is in an RRC idle mode.
- the non-access stratum (NAS) layer above the RRC layer performs functions such as session management and mobility management.
- One cell constituting the base station is set to one of the bandwidth, such as 1.25, 2.5, 5, 10, 15, 20Mhz to provide a downlink or uplink transmission service to multiple terminals.
- Different cells may be configured to provide different bandwidths.
- the downlink transport channel for transmitting data from the network to the UE includes a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting a paging message, and a downlink shared channel (SCH) for transmitting user traffic or a control message.
- BCH broadcast channel
- PCH paging channel
- SCH downlink shared channel
- Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
- the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or a control message.
- RAC random access channel
- SCH uplink shared channel
- BCCH broadcast control channel
- PCCH paging control channel
- CCCH common control channel
- MCCH multicast control channel
- MTCH multicast. Traffic Channel
- FIG. 3 is a diagram for describing 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 (S301). 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 control channel (PDSCH) according to a physical downlink control channel (PDCCH) and information on the PDCCH. It may be (S302).
- PDSCH physical downlink control channel
- PDCCH physical downlink control channel
- the terminal may perform a random access procedure (RACH) for the base station (steps S303 to S306).
- RACH random access procedure
- the UE may transmit a specific sequence to the preamble through a physical random access channel (PRACH) (S303 and S305), and receive a response message for the preamble through the PDCCH and the corresponding PDSCH ( S304 and S306).
- 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 (S307) 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 (S308) may be performed.
- the terminal receives downlink control information (DCI) through the PDCCH.
- DCI downlink control information
- the DCI includes control information such as resource allocation information for the terminal, and the format is different according to the purpose of use.
- the control 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 ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), and a rank indicator (RI). ), And the like.
- the terminal may transmit the above-described control information such as CQI / PMI / RI through the PUSCH and / or PUCCH.
- FIG. 4 is a diagram illustrating a structure of a radio frame used in an LTE system.
- a radio frame has a length of 10 ms (327200 ⁇ 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 x Ts).
- the slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
- one resource block includes 12 subcarriers x 7 (6) OFDM symbols.
- Transmission time interval which is a unit time for transmitting data, may be determined in units of one or more subframes.
- the structure of the radio frame described above is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of OFDM symbols included in the slot may be variously changed.
- FIG. 5 is a diagram illustrating a control channel included in a control region of one subframe in a downlink radio frame.
- a subframe consists of 14 OFDM symbols.
- the first 1 to 3 OFDM symbols are used as the control region and the remaining 13 to 11 OFDM symbols are used as the data region.
- R1 to R4 represent reference signals (RSs) or pilot signals for antennas 0 to 3.
- the RS is fixed in a constant pattern in a subframe regardless of the control region and the data region.
- the control channel is allocated to a resource to which no RS is allocated in the control region, and the traffic channel is also allocated to a resource to which no RS is allocated in the data region.
- Control channels allocated to the control region include PCFICH (Physical Control Format Indicator CHannel), PHICH (Physical Hybrid-ARQ Indicator CHannel), PDCCH (Physical Downlink Control CHannel).
- the PCFICH is a physical control format indicator channel and informs the UE of the number of OFDM symbols used for the PDCCH in every subframe.
- the PCFICH is located in the first OFDM symbol and is set in preference to the PHICH and PDCCH.
- the PCFICH is composed of four Resource Element Groups (REGs), and each REG is distributed in a control region based on a Cell ID (Cell IDentity).
- One REG is composed of four resource elements (REs).
- the RE represents a minimum physical resource defined by one subcarrier x one OFDM symbol.
- the PCFICH value indicates a value of 1 to 3 or 2 to 4 depending on the bandwidth and is modulated by Quadrature Phase Shift Keying (QPSK).
- QPSK Quadrature Phase Shift Keying
- the PHICH is a physical hybrid automatic repeat and request (HARQ) indicator channel and is used to carry HARQ ACK / NACK for uplink transmission. That is, the PHICH indicates a channel through which DL ACK / NACK information for UL HARQ is transmitted.
- the PHICH consists of one REG and is scrambled cell-specifically.
- ACK / NACK is indicated by 1 bit and modulated by binary phase shift keying (BPSK).
- BPSK binary phase shift keying
- a plurality of PHICHs mapped to the same resource constitutes a PHICH group.
- the number of PHICHs multiplexed into the PHICH group is determined according to the number of spreading codes.
- the PHICH (group) is repeated three times to obtain diversity gain in the frequency domain and / or the time domain.
- the PDCCH is a physical downlink control channel and is allocated to the first n OFDM symbols of a subframe.
- n is indicated by the PCFICH as an integer of 1 or more.
- the PDCCH consists of one or more CCEs.
- the PDCCH informs each UE or UE group of information related to resource allocation of a paging channel (PCH) and a downlink-shared channel (DL-SCH), an uplink scheduling grant, and HARQ information.
- PCH paging channel
- DL-SCH downlink-shared channel
- Paging channel (PCH) and downlink-shared channel (DL-SCH) are transmitted through PDSCH. Accordingly, the base station and the terminal generally transmit and receive data through the PDSCH except for specific control information or specific service data.
- Data of the PDSCH is transmitted to which UE (one or a plurality of UEs), and information on how the UEs should receive and decode PDSCH data is included in the PDCCH and transmitted.
- a specific PDCCH is CRC masked with a Radio Network Temporary Identity (RNTI) of "A”, a radio resource (eg, frequency location) of "B” and a DCI format of "C", that is, a transmission format. It is assumed that information about data transmitted using information (eg, transport block size, modulation scheme, coding information, etc.) is transmitted through a specific subframe.
- RTI Radio Network Temporary Identity
- the terminal in the cell monitors the PDCCH using the RNTI information it has, and if there is at least one terminal having an "A" RNTI, the terminals receive the PDCCH, and through the information of the received PDCCH " Receive the PDSCH indicated by B " and " C ".
- each of the base station and the terminal may perform beamforming based on channel state information in order to obtain a multiplexing gain of the MIMO antenna.
- the base station transmits a reference signal to the terminal in order to obtain the channel state information from the terminal, and instructs to feed back the channel state information measured based on the physical uplink control channel (PUCCH) or the physical uplink shared channel (PUSCH).
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- CSI is largely classified into three types of information, such as a rank indicator (RI), a precoding matrix index (PMI), and a channel quality indication (CQI).
- RI represents rank information of a channel, and means the number of streams that a UE can receive through the same frequency-time resource.
- the RI is fed back to the base station at a longer period than the PMI and CQI values.
- PMI is a value reflecting spatial characteristics of a channel and represents a precoding matrix index of a base station preferred by a terminal based on a metric such as SINR.
- CQI is a value representing the strength of the channel, which means the reception SINR that can be obtained when the base station uses PMI.
- an interfering cell uses a subframe that reduces or does not transmit transmit power of some physical channels, that is, an almost blank subframe (ABS), and the interfered cell schedules the UE in consideration of this.
- ABS almost blank subframe
- the interference level of the UE of the interfered cell is greatly changed according to the subframe.
- more accurate radio link monitoring (RLM) operation is performed in each subframe, or RSRP (Reference Signal)
- RLM radio resource management
- RRM radio resource management
- the RLM / RRM And CSI measurement should be limited to a subframe set having uniform interference characteristics.
- the current LTE standard reflects this discussion, and is defined in such a way that higher layer signaling informs the UE of a specific subframe set, and does not perform RLM / RRM and CSI measurement in other subframes other than the specific subframe set.
- the present invention proposes a method for the UE to calculate and report appropriate channel status information or downlink link quality in the presence of dominant interference.
- a situation in which dominant interference exists refers to a situation in which a UE has a greater level of interference than a signal of its serving cell.
- FIG. 6 is a diagram illustrating a situation in which dominant interference exists.
- the transmission power of the pico eNB may be lower than that of the macro eNB, resulting in dominant interference from the macro eNB.
- the interfering eNB stops transmission (or reduces transmission power) at some time and / or frequency resource for smooth operation of the interfered UE. In this manner, interference mitigation cooperative operation for serving the UE on the resource with the interference removed / reduced may be performed.
- the macro eNB sets some subframes to most blank subframes (ABSs) that do not transmit unicast signals, and transmits the subframe information to the pico eNB, thereby reducing the interference from the macro eNB. May help to schedule the corresponding UE in the subframe.
- ABSs blank subframes
- a signal such as PDSCH or PDCCH for unicast scheduling is not transmitted in the corresponding subframe.
- some signals are preferably transmitted in ABS.
- a representative example of a signal transmitted in the ABS is a CRS that performs various measurements.
- the CRS since the CRS is also transmitted in the ABS, it acts as an interference to the UE of the neighbor cell and causes performance deterioration.
- the transmission of CRS in ABS depends on whether the corresponding subframe is configured as a multicast broadcast single frequency network (MBSFN) subframe in an interfering cell. If the subframe is configured as an MBSFN subframe, the CRS is not transmitted in the PDSCH region but the MBSFN subframe is used. If not configured as a frame, the CRS should be transmitted in the PDSCH region.
- MBSFN multicast broadcast single frequency network
- FIG. 7A and 7B are diagrams for explaining a difference depending on whether ABS is configured as an MBSFN subframe.
- FIG. 7A illustrates that the ABS is not set to the MBSFN subframe, and the CRS is transmitted in the PDSCH region transmitted from the macro eNB.
- FIG. 7B shows that the ABS is set to the MBSFN subframe, and thus, the CRS is not transmitted in the PDSCH region transmitted from the macro eNB.
- the CRS of the eNB may be transmitted to different locations on the subcarrier.
- the UE may perform appropriate processing.
- One typical processing is interference cancellation, in which the UE first measures the CRS interference channel and then subtracts this estimated interference from the received signal and then recovers the desired signal.
- This method has the advantage of completely eliminating CRS interference in an ideal case, but has disadvantages in terms of battery consumption since adjacent cell signals must be estimated separately at all times.
- Another processing is the RE puncturing at the receiver side, which is a way of avoiding the effects of CRS interference by the UE not using the RE, which has strong interference from neighbor cell CRS, for decoding.
- This method has the disadvantage of not being able to use some REs for decoding, but has the advantage of being simpler to implement than the interference invalidation method.
- the effect on decoding performance varies according to the size of a transport block transmitted. This is because, when one transport block exceeds a certain size, the rate at which the CRS interference occupied by a specific code block is divided into a plurality of code blocks and separately decoded so that the CRS interference existing in a specific RE is determined by the size of the transport block. Since resources are allocated in the frequency-priority mapping scheme of the LTE PDSCH, in general, as the size of a transport block increases, there is a high probability that more CRS interference remains in a specific code block. Although the network needs to know that interference invalidation is applied, it is possible to estimate the effect of CRS interference on the allocated transport block size to perform appropriate link adaptation.
- FIG. 8 illustrates an example of comparing the influence of inter-cell interference on each code block when one transport block is divided into a plurality of code blocks.
- the total allocated resource is divided into three code blocks, but code block 1 is experiencing twice as many CRS interferences as the other two code blocks, and this particular block is caused by the remaining CRS interferences even after interference invalidation.
- the decoding performance of the code block is worse than the rest.
- this phenomenon does not appear when only one code block exists in the entire resource because the number of allocated RBs is small.
- the number of REs punctured in a particular code block is determined by the transport block size, so the network needs to know what processing is working to perform the link adaptation process. have.
- the present invention proposes a method of measuring CSI or a method of measuring link quality.
- FIG. 9 is a diagram illustrating a method for measuring CSI or link quality by a UE according to an embodiment of the present invention.
- the network may transmit a signal to the UE indicating whether to operate processing for processing CRS interference as shown in step 901.
- the eNB may measure and report CSI or link quality through a higher layer signaling such as an RRC signal, assuming that the UE performs an operation of appropriately handling interference from the CRS of the neighbor cell from step 903. It can be instructed to measure CSI or link quality likewise without such processing from now on.
- such an indication message may include information about the CRS interference of a neighbor cell, apart from such an indication message, such as step 902, which includes the cell identifier of the neighbor cell or the number of antenna ports, and the time offset value / frequency of the CRS RE.
- the offset value and MBSFN subframe configuration information of the neighbor cell may be included.
- the eNB will inform the UE whether to measure CSI or link quality under the assumption that it will use some form of processing (i.e., whether to use the interference invalidation technique, the receiving side RE puncturing, or no additional processing). Or, it may report to the eNB that the UE will assume some processing and measure CSI or link quality.
- an indicator indicating whether or not to assume MBSFN subframe of a specific cell may be added to the triggering PDCCH.
- a restricted measurement message may be used as an implicit indicator.
- UEs with CRS interference processing capability may enable this resource-limited measurement configuration to enable CRS interference processing. It can be interpreted as a signal, and can apply its own processing in feedback of CSI feedback or link quality measurement result in PDSCH / PDCCH demodulation. That is, if a subframe set for resource-limited measurement is set, the UE may operate an appropriate CRS interference processing process when measuring CSI or link quality for each subframe set.
- the eNB may deliver the above-described information on the CRS interference to the UE, or may report information on the CRS interference handled by the UE itself. Or without this information exchange, the UE always assumes the presence of certain features of CRS interference (e.g., assumes that the CRS interference corresponding to the number of specific antenna ports exists at a particular location) and is achievable after interference processing It may be operable to report CSI or link quality measurement results.
- MBSFN subframe configuration of an interfering cell affects UE feedback.
- MBSFN MBSFN
- the neighbor cell is not set to MBSFN
- MBSFN ABS since CRS interference does not exist in the PDSCH region, it is appropriate to report the calculated CSI or link quality measurement results without processing for separate CRS interference. Do. Since the general ABS and the MBSFN ABS may be mixed in a real network operation situation, it is desirable to process them properly so that accurate CSI or link quality measurement results are always reported.
- the present invention proposes that the general ABS and the MBSFN ABS are not included in the same subframe set. That is, if specific subframes constitute one subframe set, the MBSFN subframe configuration of the interfering cell in these subframes remains the same. This allows the UE to assume the same CRS interference processing in the same subframe set and measure CSI or link quality.
- the eNB may indicate a subframe set in which CRS interference exists and a subframe set in which CRS interference does not exist through a higher layer signal such as an RRC signal in PDSCH decoding.
- the UE may directly observe and determine the presence or absence of the CRS of the neighbor cell, assuming CRS interference processing in a specific subframe set, and measure CSI or link quality.
- the network adjusts the MBSFN subframe setting or the like appropriately so that the UE can assume the same CRS interference characteristics in the same subframe set.
- the general ABS and the MBSFN ABS coexist in the same subframe set, but the UE applies a specific assumption about CRS interference to all subframes in the specific subframe set to measure CSI or link quality. Suggest. For example, if the UE assumes to resolve CRS interference through processing of interference invalidation or receiving RE puncturing and measures CSI or link quality, the actual CRS interference exists for all subframes in a specific subframe set. Whether or not to report the CSI or link quality results achievable under the assumed processing. In addition, the UE may operate to measure CSI or link quality assuming that the assumed CRS interference exists regardless of whether or not the actual CRS interference is observed within the same subframe set if the existence of the CRS interference is assumed.
- This operation is particularly desirable for periodic CSI reporting.
- periodic CSI reporting an RI is determined by using one subframe as a reference resource, and then another Pframe is used as a reference resource to determine a PMI / CQI.
- the RI is determined and the PMI / CQI is determined, This is because consistent CSI measurement is possible even when there is a mismatch in the presence or absence of CRS interference in a reference resource when determining.
- the UE may calculate and report CSI under the assumption that CRS interference does not always exist regardless of the presence or absence of CRS interference observed on the actual subframe.
- FIG. 10 illustrates an example of setting reference resources for PMI / CQI reporting in order to maintain consistency between RI and PMI / CQI reporting according to an embodiment of the present invention.
- the RI reported in subframe SF # n + 4 and the PMI / CQI reported in SF # n + 8 set SF #n and SF # n + 4 as reference resources, respectively.
- SF #n is MBSFN ABS and there is no CRS interference
- CRS interference does not exist regardless of MBSFN subframe setting of the interference cell in SF # n + 4. It is calculated and reported in SF # n + 8.
- PMI / CQI is calculated and reported in SF # n + 8, assuming that CRS interference exists regardless of MBSFN subframe setting of the interfering cell in SF # n + 4. It is.
- MBSFN subframe setting of an interfering cell in a reference resource of each CSI report is assumed to be the same as that of a subframe used as a reference resource when the RI assumed in the corresponding CSI report is reported.
- this operation is effective when reporting CSI associated with CSI-RS transmitted intermittently for channel estimation of a serving cell. For example, if a CSI-RS is transmitted once and there are multiple CSI reporting instances that transmit RI and PMI / CQI between them, the UE changes the serving cell channel between these CSI reporting instances. It can be assumed that the PMI / CQI obtained when the RI is calculated without being recalculated. With a slight change in this method, the UE is the same MBSFN as the MBSFN subframe setting of the reference resource of the first instance of the reference resource of all the CSI reporting instances appearing after the CSI-RS is transmitted until the CSI-RS is transmitted. It may be assumed to have a subframe configuration.
- the network informs the UE of information such as the size of a transport block to be assumed in the CSI calculation or the number of allocated RBs to the UE through an upper layer signal such as an RRC signal or an L1 / L2 control signal. Do.
- the UE may report a plurality of CSIs calculated for the plurality of RBs. For example, in the case of periodic CSI reporting, the UE feeds back CSIs for the case where the number of allocated RBs is small (for example, 4 RBs) and then In this case, the CSI is fed back to the case where the number of allocated RBs is large (for example, the entire RB).
- the general ABS and MBSFN ABS proposed by the present invention coexist in the same subframe set, but the UE measures the CSI or link quality by applying a specific assumption about the CRS interference to all the subframes in the specific subframe set, in particular, an interference cell.
- ZP-ABS operation zero power PDSCH transmission
- NZP- reduced non-zero power PDSCH transmission
- the pico UE may have difficulty in measuring interference. do. For example, in a state in which a separate interference measurement resource is not set, the pico UE removes the CRS of the pico eNB and assumes that the signal observed therein is an interference signal and measures the interference as shown in FIG. 7.
- the CRS of the macro eNB is included in the interference measurement so that the interference in the ABS situation is not measured, but rather the interference similar to the non-ABS situation is measured. Occurs.
- the pico UE has the ability to remove the macro eNB's CRS, then in this case it is possible to remove the macro eNB's CRS and measure interference, but even if the macro eNB is operating NZP-ABS, the pico UE The interference measured by removing the macro eNB's CRS and measured is still an inaccurate measurement because the PDSCH power of the macro eNB (greater than zero because it is NZP-ABS, but much less than in non-ABS) is not included in the interference. This is done.
- the macro eNB operates the MBSFN ABS
- the CRS of the pico eNB and the CRS of the macro eNB do not collide with each other in the PDSCH region
- the pico UE's “reference signal to PDSCH transmit power ratio” is used to measure the interference in the general ABS (particularly when the macro eNB and the pico eNB's CRS collide). Can be forwarded to In this case, the pico UE may first measure the CRS of the macro eNB and then estimate the amount of interference in the NZP-ABS of the macro eNB based on the transmitted transmission power ratio. The pico UE removes both the pico eNB and the macro eNB's CRS, and then adds the estimated interference with the estimated interference from the eNB to calculate the interference on the NZP-ABS and measure the CSI or link quality based on the interference.
- this operation may be performed based on the CRS of the eNB as a mark transmitted in both the PDCCH region and the PDSCH region in the case of general ABS.
- the MBSFN ABS can directly measure the interference on the NZP-ABS of the macro eNB.
- the interference of the macro eNB measured directly by the MBSFN ABS is different from the interference estimated by the pico UE for the case of the general ABS.
- the interference measurement between the MBSFN ABS is inconsistent. Even in this case, this problem can be solved by applying an appropriate assumption about the existence of the CRS interference proposed by the present invention.
- the pico UE can directly measure the interference of the eNB with the macro in the PDSCH region
- the "transmission power ratio of the reference signal to PDSCH" of the macro eNB for interference measurement in the general ABS.
- the subframe is a non-MBSFN and the operation of deriving the interference estimate in the general ABS, that is, the CRS measurement of the macro eNB and the delivered power ratio information under the assumption that there is a CRS of the macro eNB.
- the pico UE In performing this operation, since the macro eNB does not actually transmit the CRS to the PDSCH region in the MBSFN ABS, the pico UE measures the CRS transmitted by the macro eNB in the PDCCH region and based on this, the macro eNB has the same signal size in the PDSCH region. Assuming that the CRS is transmitted (and assuming that the PDSCH is transmitted according to the transmitted “transmission power ratio of reference signal to PDSCH”), the operation may be performed.
- only interference measured in the MBSFN ABS may be considered valid and may operate to measure CSI or link quality, in particular
- the pico UE is measured in subframes other than the reference resource, specifically, interference measured in the MBSFN ABS belonging to the same CSI subframe set as the reference resource. It may mean to calculate the CSI based on.
- the eNB may indicate what assumption CSI or link quality is to be measured for a specific subframe set through an upper layer signal such as RRC.
- the above operation is also applicable to the measurement of interference in non-ABS situations.
- a pico UE measures interference of a non-ABS situation in a situation where the macro eNB and the pico eNB CRS collide
- in a general ABS situation only the pico eNB's CRS is removed and the interference is measured.
- the interference corresponding to the CRS is measured, in the MBSFN ABS situation, the interference corresponding to the PDSCH of the macro eNB is measured to cause inconsistency between the two.
- an appropriate assumption about whether the macro eNB transmits the CRS may be introduced in two situations.
- the macro eNB's CRS is regarded as interference from the macro eNB and only the CRS of the pico eNB is removed as in the general ABS, and the CSI or link quality Can be measured.
- the CRS of the macro eNB since the CRS of the macro eNB does not exist in the actual PDSCH region, it may be replaced by the CRS measurement of the macro eNB in the PDCCH region.
- the pico UE actually receives more interference from the PDSCH of the macro eNB, so it is measured in the MBSFN ABS (more specifically, in the PDSCH region of the MBSFN ABS without the CRS of the macro eNB). Only interference may be considered valid and may be operative to measure CSI or link quality.
- the pico UE is measured in a subframe other than the reference resource, specifically measured in the MBSFN ABS belonging to the same subframe set as the reference resource. This may mean measuring CSI or link quality based on interference.
- FIG. 11 illustrates a block diagram of a communication device according to an embodiment of the present invention.
- the communication device 1100 includes a processor 1110, a memory 1120, an RF module 1130, a display module 1140, and a user interface module 1150.
- the communication device 1100 is illustrated for convenience of description and some modules may be omitted. In addition, the communication device 1100 may further include necessary modules. In addition, some modules in the communication device 1100 may be classified into more granular modules.
- the processor 1110 is configured to perform an operation according to the embodiment of the present invention illustrated with reference to the drawings. In detail, the detailed operation of the processor 1110 may refer to the contents described with reference to FIGS. 1 to 10.
- the memory 1120 is connected to the processor 1110 and stores an operating system, an application, program code, data, and the like.
- the RF module 1130 is connected to the processor 1110 and performs a function of converting a baseband signal into a radio signal or converting a radio signal into a baseband signal. To this end, the RF module 1130 performs analog conversion, amplification, filtering and frequency up-conversion, or a reverse process thereof.
- the display module 1140 is connected to the processor 1110 and displays various information.
- the display module 1140 may use well-known elements such as, but not limited to, a liquid crystal display (LCD), a light emitting diode (LED), and an organic light emitting diode (OLED).
- the user interface module 1150 is connected to the processor 1110 and may be configured with a combination of well-known user interfaces such as a keypad and a touch screen.
- 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 a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
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Abstract
Description
Claims (12)
- 무선 통신 시스템에서 단말이 하향링크 링크 품질을 보고하는 방법에 있어서,서빙 셀로부터 자원 제한적 측정을 위한 서브프레임 집합 및 간섭 셀의 셀 특정 참조 신호에 관한 정보를 수신하는 단계;상기 서브프레임 집합에서 하향링크 링크 품질을 측정하는 단계; 및상기 측정된 하향링크 링크 품질을 서빙 셀로 보고하는 단계를 포함하고,상기 서브프레임 집합에서는,상기 간섭 셀의 셀 특정 참조 신호에 관한 정보를 이용하여, 상기 간섭 셀로부터의 셀 특정 참조 신호에 의한 간섭 제어 프로세싱을 적용하는 것을 특징으로 하는,하향링크 링크 품질 보고 방법.
- 제 1 항에 있어서,상기 서브프레임 집합에 포함되는 서브프레임은,ABS (Almost Blank Subframe) 또는 MBSFN (Multicast broadcast single frequency network)인 ABS인 것을 특징으로 하는,하향링크 링크 품질 보고 방법.
- 제 2 항에 있어서,상기 하향링크 링크 품질을 측정하는 단계는,상기 간섭 셀로부터의 상기 셀 특정 참조 신호에 의한 간섭이 제거되었다는 가정하에 상기 하향링크 링크 품질을 측정하는 단계를 포함하는 것을 특징으로 하는,하향링크 링크 품질 보고 방법.
- 제 1 항에 있어서,상기 하향링크 링크 품질은,제 1 정보 및 상기 제 1 정보에 대응하는 제 2 정보를 포함하고, 상기 제 1 정보의 전송 주기 사이에 상기 제 2 정보가 복수 회 전송되는 경우, 제 1 정보의 측정을 위한 서브프레임과 상기 제 2 정보의 측정을 위한 서브프레임은 상기 서브프레임 집합에 속하는 것으로 가정하는 것을 특징으로 하는,하향링크 링크 품질 보고 방법.
- 제 4 항에 있어서,상기 제 1 정보는 랭크 지시자 (Rank Indicator; RI)이고,상기 제 2 정보는 PMI (Precoding Matrix Index)와 CQI (Channel Quality Indicator) 중 적어도 하나를 포함하는 것을 특징으로 하는,하향링크 링크 품질 보고 방법.
- 제 1 항에 있어서,상기 서브프레임 집합에 관한 정보는,RRC (Radio Resource Control) 계층을 통하여 수신하는 것을 특징으로 하는,하향링크 링크 품질 보고 방법.
- 무선 통신 시스템에서의 단말 장치로서,서빙 셀로부터 자원 제한적 측정을 위한 서브프레임 집합 및 간섭 셀의 셀 특정 참조 신호에 관한 정보를 수신하기 위한 수신 모듈;상기 서브프레임 집합에서 하향링크 링크 품질을 측정하기 위한 프로세서; 및상기 측정된 하향링크 링크 품질을 서빙 셀로 보고하기 위한 송신 모듈을 포함하고,상기 프로세서는,상기 서브프레임 집합에서는, 상기 간섭 셀의 셀 특정 참조 신호에 관한 정보를 이용하여, 상기 간섭 셀로부터의 셀 특정 참조 신호에 의한 간섭 제어 프로세싱을 적용하는 것을 특징으로 하는,단말 장치.
- 제 7 항에 있어서,상기 서브프레임 집합에 포함되는 서브프레임은,ABS (Almost Blank Subframe) 또는 MBSFN (Multicast broadcast single frequency network)인 ABS인 것을 특징으로 하는,단말 장치.
- 제 8 항에 있어서,상기 프로세서는,상기 간섭 셀로부터의 상기 셀 특정 참조 신호에 의한 간섭이 제거되었다는 가정하에 상기 하향링크 링크 품질을 측정하는 단계를 포함하는 것을 특징으로 하는,단말 장치.
- 제 7 항에 있어서,상기 하향링크 링크 품질은, 제 1 정보 및 상기 제 1 정보에 대응하는 제 2 정보를 포함하고, 상기 제 1 정보의 전송 주기 사이에 상기 제 2 정보가 복수 회 전송되는 경우, 상기 프로세서는,제 1 정보의 측정을 위한 서브프레임과 상기 제 2 정보의 측정을 위한 서브프레임은 상기 서브프레임 집합에 속하는 것으로 가정하는 것을 특징으로 하는,단말 장치.
- 제 10 항에 있어서,상기 제 1 정보는 랭크 지시자 (Rank Indicator; RI)이고,상기 제 2 정보는 PMI (Precoding Matrix Index)와 CQI (Channel Quality Indicator) 중 적어도 하나를 포함하는 것을 특징으로 하는,단말 장치.
- 제 7 항에 있어서,상기 수신 모듈은,상기 서브프레임 집합에 관한 정보를 RRC (Radio Resource Control) 계층을 통하여 수신하는 것을 특징으로 하는,단말 장치.
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EP12834170.8A EP2760145B1 (en) | 2011-09-20 | 2012-09-04 | Method for measuring link quality in a wireless communication system and apparatus therefor |
JP2014531707A JP5926385B2 (ja) | 2011-09-20 | 2012-09-04 | 無線通信システムにおいてリンク品質を測定する方法及びこのための装置 |
US14/345,377 US9648510B2 (en) | 2011-09-20 | 2012-09-04 | Method for measuring link quality in a wireless communication system and apparatus therefor |
ES12834170T ES2744702T3 (es) | 2011-09-20 | 2012-09-04 | Procedimiento de medición de la calidad del enlace en un sistema de comunicación inalámbrico y aparato para el mismo |
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JP2014531822A (ja) | 2014-11-27 |
US9648510B2 (en) | 2017-05-09 |
CN103918205A (zh) | 2014-07-09 |
EP2760145A1 (en) | 2014-07-30 |
KR101907019B1 (ko) | 2018-12-07 |
JP6212593B2 (ja) | 2017-10-11 |
KR20140077884A (ko) | 2014-06-24 |
JP5926385B2 (ja) | 2016-05-25 |
EP2760145A4 (en) | 2015-07-08 |
US20140341057A1 (en) | 2014-11-20 |
CN103918205B (zh) | 2017-08-08 |
JP2016171578A (ja) | 2016-09-23 |
EP2760145B1 (en) | 2019-06-26 |
ES2744702T3 (es) | 2020-02-26 |
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