WO2014148812A1 - 다중 셀 기반 무선 통신 시스템에서 단말이 신호를 송수신하는 방법 및 이를 위한 장치 - Google Patents
다중 셀 기반 무선 통신 시스템에서 단말이 신호를 송수신하는 방법 및 이를 위한 장치 Download PDFInfo
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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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
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving signals by a terminal in a multi-cell based wireless communication system.
- a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (LTE)) communication system will be described in brief.
- E-UMTS Evolved Universal Mobile Telecommunications System
- E-UMTS UMTSCUniversal Mobile Telecommunications System
- LTE LTECLong Term Evolution
- an E-UMTS is an access gateway located at an end of a user equipment (UE) and a base station (eNode B), an eNB, and an network (E-UTRAN) and connected to an external network; AG)
- a base station can 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 20 MHz to provide a downlink or uplink transmission service 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.
- For downlink (DL) data the base station transmits downlink scheduling information to inform the user equipment of time / frequency domain, encoding, data size, and HARQ (Hybrid Automatic Repeat and reQuest) related information.
- the base station transmits uplink scheduling information to the terminal for uplink (UL) data and informs the user of the time / frequency domain, encoding, data size, HARQ-related information, etc. available to the terminal.
- DL downlink
- HARQ Hybrid Automatic Repeat and reQuest
- 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 TACTracking Area consisting of a plurality of cells.
- Wireless communication technology has been developed up 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.
- the present invention proposes a method for transmitting and receiving a signal and a device therefor in a multi-cell based wireless communication system.
- a method for transmitting and receiving a signal by a terminal includes: capability information in which the number of supportable CSI processes (Channel Status Information Process) is set to 0 (capabi 1 informat ion) Transmitting the to the serving cell; In response to the performance information, receiving information about an adjacent cell from an upper layer signal from the serving cell; Receiving a cell specific reference signal from the neighbor cell; Reporting an estimated channel status format (CSI) to the serving cell based on the cell specific reference signal; And receiving the UE-specific reference signal and data channel based on the CSI from the neighbor cell. Characterized in that it comprises a step.
- the receiving of the terminal specific reference signal and the data channel may include detecting the terminal specific reference signal; And decoding the data channel using the information estimated by the terminal specific reference signal.
- the sal specific reference signal related information of the neighbor cell may include cell identifier information of the neighbor cell.
- the terminal specific reference signal may be detected using cell identifier information of the neighbor cell.
- the terminal specific reference signal may be a terminal specific reference signal that assumes that a wide range characteristic is the same as the cell specific reference signal in the information on the neighbor cell.
- the broad characteristics include at least one of Doppler spread, Doppler shift, average delay, and delay spread.
- the CSI reported to the serving cell may be delivered to the neighboring cell.
- the information about the neighbor cell may include information about a cell specific reference signal of the neighbor cell.
- a terminal device in a multi-cell based wireless communication system the wireless communication module for transmitting and receiving signals with the network through the multi-cell; A 'and the processor, and a processor for processing the signal, supportable CSI processes serving the capability information (capability informat ion) number is set to 0 in the (Channel Status Information Process) cell transmission, and the performance information,
- the UE receives information about a neighbor cell through a higher layer signal from the serving cell, receives a cell-specific reference signal from the neighbor cell, and estimates a channel status informat ion (CSI) based on the cell-specific reference signal. And report the to the serving cell and control the wireless communication modules to receive the UE-specific reference signal and data channel based on the CSI from the neighbor cell.
- a terminal may transmit and receive a signal more efficiently in a multi-cell based wireless communication system.
- FIG. 1 is a diagram schematically showing 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 a PP radio access network standard.
- FIG. 3 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same.
- FIG. 3 is a diagram for explaining 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 structure of an uplink subframe used in an LTE system.
- FIG. 7 is a configuration diagram of a general multi-antenna (MIM0) communication system.
- MIM0 multi-antenna
- 8 and 9 illustrate a structure of a downlink reference signal in an LTE system supporting downlink transmission using four antennas.
- FIG. 11 exemplifies CSI-RS configuration # 0 when a general CP is used among downlink CSI-RS configuration defined in the current 3GPP standard document.
- FIG. 12 is a signal flow diagram illustrating a communication scheme according to an embodiment of the present invention.
- Figure 13 illustrates a block diagram of a communication device according to an embodiment of the present invention. [Form for implementation of invention]
- the present specification describes an embodiment of the present invention using an LTE system and an LTE-A system, but this is an example and the embodiment of the present invention can 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 FDD scheme, but the embodiment of the present invention can be easily modified and applied to the H-FDD scheme or the TDD scheme as an example.
- the specification of the base station may be used in a generic term including a remote radio head (RRH), an eNB, a TP transmission point (RR), a receptor ion point (RP), a relay, and the like.
- RRH remote radio head
- eNB eNode B
- RR TP transmission point
- RP receptor ion point
- 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 a 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 tier 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 SC-FDMAC Single Carrier Frequency Division Multiple Access (SCDMA) scheme in the uplink.
- OFDMA Orthogonal Frequency Division Multiple Access
- SCDMA 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
- Layer 2 RLC trade-offs ensure reliable data transfer Support.
- the function of the RLC layer may be implemented as a function block inside the MAC.
- the Layer Data Packet Convergence Protocol (PDCP) layer of Layer 2 provides unnecessary control for efficiently transmitting IP packets such as IPv4 or IPv6 over a narrow bandwidth air interface. Perform header compression to reduce information.
- PDCP Layer Data Packet 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 the control of logical channels, transport channels, and physical channels in connection with configuration, re-conf igurat ion, 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 connection (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 (e NB) is set to one of bandwidths such as 1.25, 2.5, 5, 10, 15, and 20 MHz to provide downlink or uplink transmission services to various terminals. Different cells may be configured to provide different bandwidths.
- a downlink transport channel for transmitting data from a network to a 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. ). 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). Meanwhile, 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.
- BCH broadcast channel
- PCH paging channel
- SCH downlink shared channel
- BCCH Broadcast Control Channel
- PCCHCPaging Control Channel PCCHCPaging Control Channel
- CCCHCCo ⁇ i Control Channel Multicast 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 performs an initial cell search operation such as synchronizing with the base station (S301).
- the UE 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.
- the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell.
- the terminal may receive a downlink reference signal (DL RS) in an initial cell search step to check the downlink channel state.
- DL RS downlink reference signal
- the UE which has completed the initial cell search receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information carried on the PDCCH for a more specific system.
- Information can be obtained (S302).
- 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 as a preamble through a physical random access channel (PRACH) (S303 and S305), and may receive a response message for the preamble through the PDCCH and the Daesung PDSCH. (S304 and S306).
- PRACH physical random access channel
- S304 and S306 In case of contention-based RACH, a contention resolution procedure may be additionally performed.
- the UE After performing the above-described procedure, the UE performs a PDCCH / PDSCH reception (S307) and a physical uplink shared channel (PUSCH) / physical uplink control channel as a general uplink / downlink signal transmission procedure.
- Physical Uplink Control Channel (PUCCH) transmission (S308) may be performed.
- the terminal receives downlink control information (DCI) through the PDCCH.
- DCI includes control information such as resource allocation information for the terminal, and the format is different depending on 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 is a downlink / uplink ACK / NACK signal, CQI (Channel Quality Indicator), PMK Precoding Matrix Index (RI), RI (Rank) Indicators).
- 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 XT S ) 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 (15360xT s ).
- the slot includes a plurality of 0FDM symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain.
- one resource block includes 12 subcarriers X7 (6) 0FDM symbols.
- the transmission time interval (TTI), which is a unit time in which data is transmitted, may be determined in units of one or more subframes.
- TTI transmission time interval
- the above-described structure of a radio frame is merely an example, and the number of subframes or subframes included in the radio frame is included.
- the number of slots included and the number of 0FDM 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 0FDM symbols.
- the first 1 to 3 0FDM symbols are used as the control region and the remaining 13-11 0FDM symbols are used as the data region.
- R1 to R4 represent reference signals (RS) 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 assigned to a resource that is not assigned an RS in the control area.
- the traffic channel is also allocated to a resource to which no RS is allocated in the data area.
- 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 within a control region based on cell IlXCell IDentity.
- One REG is composed of four resource elements (REs).
- RE represents a minimum physical resource defined by one subcarrier and 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 (QPS).
- QPS Quadrature Phase Shift Keying
- 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. PHICH is 1
- HARQ physical hybrid automatic repeat and request
- It is composed of REGs and is cell-specifically scrambled.
- ACK / NACK is indicated by 1 bit and modulated by binary phase shift keying (BPSK).
- SF Spreading Factor
- a plurality of PHICHs mapped to the same resource constitutes a PHICH group.
- the number of PHICHs multiplied in 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.
- PCiKPaging channel) and DL-SCH Down 1 ink-shared channel
- 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 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, a frequency location) of " ⁇ " and a DCI format of "C", that is, transmission format information.
- RNTI Radio Network Temporary Identity
- information about data transmitted using eg, a transport block size, modulation scheme, coding information, etc.
- the terminals receive the PDCCH and receive the PDSCH indicated by and "C" through the received information of the PDCCH. do.
- FIG. 6 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
- an uplink subframe may be divided into a region to which a Physical Uplink Control CHannel (PUCCH) carrying control information is allocated and a region to which a PUSCHCPhysical Uplink Shared CHannel (CA) carrying user data is allocated.
- the middle part of the subframe is allocated to the PUSCH, and both parts of the data area are allocated to the PUCCH in the frequency domain.
- Control information transmitted on the PUCCH includes AC / NACK used for HARQ, a CQKChannel Quality Indicator indicating a downlink channel state, a RKRank Indicator for MIM0), a SR (Scheduling Request), which is an uplink resource allocation request.
- the PUCCH for one UE uses one resource block occupying a different frequency in each slot in a subframe. That is, two resource blocks allocated to the PUCCH are frequency hoped at the slot boundary.
- MIMO Multiple-Input Multiple-Output
- MIMO Multiple-Input Multiple-Output
- MIMO Multiple-Input Multiple-Output
- MIMO Multiple-Input Multiple-Output
- the multi-antenna technique does not rely on a single antenna path to receive one entire message. Instead, the multiplex antenna technology completes data by merging data fragments received from multiple antennas together. Using multi-antenna technology, the data transmission rate can be improved within a given sized sal region, Alternatively, system coverage can be increased while ensuring specific data rates. This technique can also be widely used in mobile communication terminals, repeaters, and the like. According to the multiple antenna technology, it is possible to overcome the transmission limit in the mobile communication according to the prior art, which used a single antenna.
- FIG. 1 A configuration diagram of a general multi-antenna (MIM0) communication system is shown in FIG.
- Transmitter had a transmitting antenna is installed dog ⁇ ⁇ , the receiving end has a receiving antenna installed dog N R.
- N R the receiving antenna installed dog
- the theoretical channel transmission capacity is increased than when using the plurality of antennas at either the transmitting end or the receiving end.
- the increase in channel transmission capacity is proportional to the number of antennas. Therefore, the transmission rate is improved and the frequency efficiency is improved.
- the maximum transmission rate when using one antenna is R 0
- the transmission rate when using the multiplexing antenna is theoretically, the maximum transmission as shown in Equation 1 below.
- the rate Ro can be increased by multiplying the rate increase rate Ri. Where Ri is N ⁇ and N R increase.
- MIM0 communication using four transmit antennas and four receive antennas In a system, theoretically four times the transmission rate can be obtained compared to a single antenna system. Since the theoretical capacity increase of the multimode antenna system was proved in the mid-90s, various techniques for substantially improving the data rate have been actively studied to date, and some of these technologies have already been developed for 3G mobile communication and next generation WLAN. It is reflected in various wireless communication standards.
- the current trends of multi-antenna researches include the study of information theory aspects related to the calculation of multi-antenna communication capacity in various channel and multi-access environments, measurement of radio channels and model derivation of multi-antenna systems, and improvement of transmission reliability.
- Active research is being conducted from various viewpoints, such as research on space-time signal processing technology for improving data rate.
- the mathematical modeling may be expressed as follows. As shown in FIG. 7, it is assumed that there are N ⁇ transmit antennas and N R receive antennas. First, referring to the transmission signal, when there are N ⁇ transmit antennas, since the maximum transmittable information is N ⁇ , the transmission information may be represented by a vector shown in Equation 2 below.
- the transmission power can be different for each transmission information ⁇ , and if the transmission power is configured, the transmission information adjusted to the transmission power is represented by a vector as shown in Equation 3 below. .
- Equation 4 Is expressed using the diagonal matrix of transmission power, as shown in Equation 4 below. [66] [Equation 4]
- the physical meaning of a tank in a channel matrix is to send different information on a given channel. It is the maximum number. So the channel matrix Since the rank is defined as the minimum number of independent rows or columns, the tanks of the matrix cannot be larger than the number of rows or columns. For example, the tank (rank (H)) of the channel matrix H is limited as shown in Equation 6 below.
- each of the different information sent using the multi-antenna technique will be defined as a 'stream' or simply 'stream'.
- a 'stream' may be referred to as a 'layer'.
- the number of transport streams can then, of course, not be larger than the tank of the channel, which is the maximum number of different information that can be sent. Therefore, the channel matrix H can be expressed as Equation 7 below.
- the LTE-A system which is a standard of the next generation mobile communication system, is expected to support CoMP (Coordinated Multi Point) transmission method, which was not supported in the existing standard, to improve data rate.
- the CoMP transmission scheme refers to a transmission scheme in which two or more base stations or cells cooperate with each other to communicate with the terminal in order to improve communication performance between the terminal and the base station (Sal or Sackter) in the shadow area.
- CoMP transmission method is a joint MIM0 type joint through data sharing Processing (CoMP-Joint Processing, CoMP-JP) and Cooperative Scheduling / Beamforming (CoMP-CS / CB) can be distinguished.
- a UE may simultaneously receive data from each base station performing a CoMP transmission scheme and combine the received signals from each base station to improve reception performance.
- JT Joint Transmission
- one of the base stations performing the CoMP transmission scheme may also consider a method for transmitting data to the terminal at a specific time point (DPS; Dynamic Point Selection).
- DPS Dynamic Point Selection
- the terminal may receive data through one base station, that is, a serving base station instantaneously through the bump forming.
- each base station may simultaneously receive a PUSCH signal from the terminal (Joint Reception (JR)).
- JR Joint Reception
- CoMP-CS / CB cooperative scheduling / beamforming scheme
- only one base station receives a PUSCH, where the decision to use the cooperative scheduling / bumping scheme is determined by the cooperative cells (or base stations). Is determined.
- the 3GPP LTE standard document specifically, the 3GPP TS 36.213 document defines the downlink data channel transmission mode as shown in Table 1 below.
- the following transmission mode is set to the terminal through higher layer signaling, that is, RRC signaling.
- the current 3GPP LTE standard document shows a transmission mode and a corresponding DCI format, that is, a transmission mode based DCI format.
- DCI format 1A is defined for Fall-back mode, which can be applied irrespective of each transmission mode.
- the transmission mode if the DCI format 1B is detected as a result of the UE blind decoding the PDCCH in Table 1, a closed loop using a single layer The PDSCH is decoded on the assumption that the PDSCH is transmitted by a spatial multiplexing technique.
- the transmission mode 10 in Table 1 means the downlink data channel transmission mode of the CoMP transmission method described above.
- the PDSCH is decoded under the assumption that the PDSCH is transmitted by a multilayer transmission scheme based on antenna ports 7 to 14, that is, the DM-RS.
- the PDSCH is decoded on the assumption that the PDSCH is transmitted by a single antenna transmission scheme based on the DM-RS antenna ports 7 or 8.
- the transmission mode varies depending on whether the corresponding subframe is an MBSFN subframe. For example, if the corresponding subframe is a non-MBSFN subframe, the PDSCH is decoded under the assumption that it is transmitted using a single antenna transmission based on CRS of antenna port 0 or a CRS based transmission diversity scheme. In addition, when the corresponding subframe is an MBSFN subframe, the PDSCH may decode assuming that a single antenna transmission based on the DM-RS of the antenna port 7 is performed.
- a reference signal which is known to both the transmitting side and the receiving side, is transmitted from the transmitting side to the receiving side together with data for channel measurement.
- a reference signal informs the modulation technique as well as the channel measurement to play a demodulation process.
- the reference signal is a dedicated RS (DRS) for a base station and a specific UE, that is, a UE-specific reference signal and a cell-specific reference signal for all UEs in a cell (co ⁇ on RS or Cell specific RS; CRS). ).
- the Sal-specific reference signal includes a reference signal for measuring the CQI / PMI / RI in the terminal to report to the base station, this is referred to as Channel State Informat ion-RS (CSI-RS).
- CSI-RS Channel State Informat ion-RS
- FIG. 8 and 9 illustrate the structure of a reference signal in an LTE system supporting downlink transmission using four antennas.
- FIG. 8 illustrates the case of normal cyclic prefix
- FIG. 9 illustrates the case of extended cyclic prefix.
- 0 to 3 described in the lattice are antenna ports 0 to 3 A cell-specific reference signal transmitted for each channel measurement and data demodulation.
- the cell specific reference signal, CRS may be transmitted to the UE not only in the data information region but also in the entire control information region.
- 'D' described in the grid refers to a downlink DM-RS (DM-RS) which is a UE-specific RS, and the DM-RS supports single antenna port transmission through a data region, that is, a PDSCH.
- the terminal is signaled through the upper layer whether the DM-RS which is the terminal specific RS is present.
- 8 and 9 illustrate DM-RSs for antenna port 5, and 3GPP standard document 36.211 also defines DM-RSs for antenna ports 7 to 14, that is, a total of eight antenna ports.
- DM-RS corresponding to antenna ports ⁇ 7, 8, 11, 13 ⁇ are mapped to DM-RS group 1 using a sequence of antenna ports, and antennas are included in DM-RS group 2.
- DM—RSs corresponding to ports ⁇ 9, 10, 12, 14 ⁇ are similarly mapped using antenna-specific sequence.
- the above-described CSI-RS has been proposed for the purpose of channel measurement for PDSCH separately from the CRS.
- the CSI-RS is designed to reduce inter-cell interference (ICI) in a multi-cell environment. Up to 32 different resource configurations can be defined.
- the CSI-RS (resource) configuration is different depending on the number of antenna ports, and configured to transmit CSI-RSs defined by different (resource) configurations as much as possible between adjacent cells.
- CSI-RS supports up to 8 antenna ports, and 3GPP standard documents allocate 8 antenna ports as antenna ports for CSI-RS.
- Tables 2 and 3 below show the CSI-RS settings defined in the 3GPP standard document, in particular, Table 2 shows the case of Normal CP, and Table 3 shows the case of Extended CP.
- FIG. 11 shows CSI- defined in the current 3GPP standard document. An example of CSI-RS configuration # 0 in the case of a general CP among RS configurations is illustrated.
- the CSI-RS subframe configuration may be defined, and is composed of a period ( r c SI - RS ) and a subframe offset (ACS RS) expressed in units of subframes. Table 4 below,
- ZP CSI-RS resource configuration consists of zeroTxPowerSubframeConfig and zeroTxPowerResourceConfigList, which is a 16-bit bitmap.
- zeroTxPowerSubframeConfig informs the period and subframe offset at which the ZP CSI-RS is transmitted through the ⁇ SI-RS value corresponding to Table 3.
- zeroTxPowerResourceConfigList is information indicating ZP CSI-RS configuration, and each element of the bitmap includes configurations included in a column having four antenna ports for CSI-RS in Table 1 or Table 2. Instruct.
- the general CSI-RS, rather than the ZP CSI-RS, is referred to as a non zero-power (NZP) CSI-RS.
- NZP non zero-power
- the UE may receive a plurality of CSI-RS settings through an RRC layer signal.
- Each CSI-RS configuration is defined as shown in Table 5 below. Referring to Table 5, it can be seen that information about CRS that can be assumed for QC Quasi Co-Location) is included for each CSI-RS configuration.
- a PDSCH RE Mapping and Quasi-Co-Locat ion Indicator (PQI) field is defined in DCI format 2D for transmission mode 10, which is a CoMP PDSCH transmission.
- the PQI field is defined as a 2-bit size to indicate a total of four states as shown in Table 6 below, and the information indicated in each state is a parameter set for receiving a PDMP of CoMP scheme, and specific values are higher. Signaled in advance through the layer. That is, a total of four parameter sets may be signaled semi-statically through the RRC layer signal for Table 6 below, and the PQI field of the DCI format 2D indicates one of the four parameter sets dynamically.
- Information included in the parameter set includes the number of CRS antenna ports (crs-PortsCount), the frequency shift value of the CRS (crs-FreqShift), and the MBSFN subframe setting (mbs f n-Sub fr ameCon fi gL ist).
- ZP CSI-RS configuration csi-RS-ConfigZPId
- PDSCH start symbol pdsch-Start
- NZP Non-ZP
- QSI Quantasi Co-Locat ion
- QCL between antenna ports means that the large-scale properties of a signal (or a wireless channel to which the antenna port is received) from one antenna port is received from another antenna port. It can be assumed that all or some of the broad characteristics of the signal (or the wireless channel to the corresponding antenna port) are the same.
- the broad characteristics include Doppler spread related to frequency offset, Doppler shift, average delay related to timing offset, delay spread, and the like, and further, average gain. (average gain) may also be included.
- the UE cannot assume that the wide range characteristics are the same between non-QCL antenna ports, that is, NQCUNon Quasi co-Located antenna ports. In this case, the UE must independently perform a tracking procedure for acquiring frequency offset and timing offset for each antenna port.
- the UE may perform the following operations between the QCL antenna ports.
- the UE estimates the power-delay profile, delay spread and Doppler spect im and Doppler spread estimation results for the wireless channel to the specific antenna port. The same applies to Wiener filter parameters used for channel estimation for the wireless channel.
- the terminal may apply the same synchronization to other antenna ports.
- the UE may calculate a reference signal received power (RSRP) measurement value for each of the QCL antenna ports as an average value.
- RSRP reference signal received power
- the UE schedules a DM-RS based downlink data channel through a PDCCH.
- a PDCCH When receiving information, for example, DCI format 2D, it is assumed that the terminal performs data demodulation after performing channel estimation on the PDSCH through the DM-RS sequence indicated by the scheduling information.
- the UE estimates its CRS antenna when channel estimation is performed through the corresponding DM-RS antenna port.
- DM-RS-based downlink data channel reception performance can be improved by applying large-scale properties of the radio channel estimated from the port.
- the UE performs CSI of the serving cell when channel estimation is performed through the corresponding DM-RS antenna port.
- the DM-RS based downlink data channel reception performance can be improved by applying the large-scale proper ties of the radio channel estimated from the -RS antenna port.
- the base station when transmitting a downlink signal in transmission mode 10 of CoMP mode, the base station defines one of the QCL type A and the QCL type B to the UE through an upper layer signal.
- QCL type A assumes that the antenna ports of CRS and CSI-RS and DM-RS have QCLs except for the average gain, and the wide range characteristics are QCLed, and physical channels and signals are transmitted at the same node. It means that there is.
- QCL type B assumes that the antenna ports of the DM-RS and the specific indicated CSI-RS have QCLs except for the average gain.
- the QCL type B sets up to four QCL modes per terminal through a higher layer message to enable CoMP transmission such as DPS and JT, and which of these QCL modes dynamically receives the downlink signal in DCI. It is defined to set through (downlink control information). This information is defined in qcl-CSI-RS-ConfigNZPId of the parameter set of the PQI field.
- node # 1 which consists of two antenna ports, is a CSI-RS resource. It is assumed that node # 2 consisting of N 2 antenna ports transmits # 1 and transmits CSI-RS resource # 2. In this case, CSI-RS resource # 1 is included in parameter set # 1 of the PQI and CSI-RS resource # 2 is included in parameter set # 2 of the PQI. Further, the base station signals the parameter set # 1 and the parameter set # 2 to the terminal existing within the common coverage of the node # 1 and the node # 2 through the upper layer.
- the base station configures parameter set # 1 using DCI when transmitting data (that is, PDSCH) to the corresponding terminal through node # 1, and sets parameter set # 2 when transmitting data through node # 2.
- DPS can be performed in a manner.
- the UE assumes that the CSI-RS resource # 1 and the DM-RS are QCLed when the parameter set # 1 is set through the PQI through the DCI, and the CSI-RS resource # is set when the parameter set # 2 is set through the PQI. It can be assumed that 2 and DM-RS are QCLed.
- a UE of a multi-cell based wireless communication system uses a higher layer signal, which is a semi-static signal such as CRS or TRS (tracking RS) information of a specific neighboring cell, which is not its own serving cell, to be additional separate RRC layer signaling.
- the present invention proposes a communication scheme in which a CSI feedback is received through a neighbor cell CRS or TRS, and a PDSCH is received based on a DM-RS. That is, we propose a semi-static CoMP mode.
- the neighbor cell information transmitted through higher layer signaling may be represented as a PQI parameter set as shown in Table 6, and the UE may perform the CSI feedback based on the CRS information included in the parameter set. Can be.
- the parameter set may be defined to include a CRS scrambling seed value. That is, in the PQI parameter set, only the number of CRS antenna ports (crs—PortsCount), CRS frequency shift value (crs-FreqShift), and MBSFN subframe setting Onbsfn-Subf rameConf igList) are defined for CRS rate matching in CoMP mode. It is.
- a CRS scrambling seed value for example, a physical cell-ID (PCI) of an adjacent cell exists.
- PCI physical cell-ID
- the frequency shift value is based on the p CI Since it is a calculated value, it can be excluded from the existing parameter set.
- the UE may consider a method of requesting a semi-static) MP mode, which is the communication scheme, by using UE capability signaling.
- UE performance signaling will be briefly described.
- CACC CACCarrier aggregation
- the UE needs to support the CA scheme and can be classified into a UE having a high level performance and a UE having a low level performance according to the degree of support.
- various fields, including the UE category are defined in the UE-EUTRA-Capability information element.
- the number of CSI processes supported for each frequency band or carrier supported by the UE is defined to include information as shown in Table 7 below.
- the concept of a CSI process including a combination of one NZP CSI-RS resource for signal measurement and one CSI-IM resource for interference measurement is provided.
- P supportable CSI processes
- the UE in the UE to perform the CSI feedback through the neighbor cell CRS or TRS, and to perform a communication scheme of receiving the PDSCH based on the DM-RS to deliver the performance signaling to the serving cell, It is suggested to set P to 0 or a preset value. That is, the number of CSI processes supported for each frequency band or carrier supported by the UE is defined to include information as shown in Table 8 below. In Table 8 below, a new code point ⁇ is added.
- the UE may be set to transmission mode 10 or the band may be set to transmission mode 10 only, but at this time, the CSI process setting is not received, and thus the NZP CSI-RS resource may not be set. Can be. That is, it operates in a special case of transmission mode 10.
- the fact that no NZP CSI-RS resource can be set may mean that all QCL related information is also ignored.
- the Daron RS that can make a QCL assumption with the corresponding DM-RS
- It can always be defined as the CRS or TRS of the neighbor cell. Therefore, it is preferable to ignore all other QCL-related information because it is unnecessary.
- the QCL-related information It may be defined as a direction to delete from signaling.
- the QCL assumptions between TRSs can be reinterpreted as possible.
- a UE that transmits P 0, that is, a UE that performs CSI feedback from a neighbor cell through CRS or TRS and receives a DM-RS based PDSCH, may not receive a CSI-IM configuration. In this case, if the CSI-IM configuration is delivered to the UE, the UE may ignore the error or consider it an error.
- the UE does not signal the communication scheme of the present invention with preference, but does not transmit the supportedCSI-Proc-rll field itself for a specific band.
- the scheme may signal a preference.
- the PQI field and the ZP CSI-RS configurations At least one of the CSI-IM configuration and the EPDCCH related configuration may still be set.
- the PQI field A parameter set may be delivered from a higher layer, and may indicate to the UE through RRC signaling which parameter set to apply as CRS information for the CSI feedback.
- a specific wave La meter set for example, may be convention that a parameter set is applied as an index of the minimum CRS information for the CSI feedback.
- CRS information in the signaled parameter set or a specific parameter set may be ignored.
- information on a PDSCH start symbol, information on PDSCH rate matching for a corresponding CRS, or information on PDSCH rate matching for a ZP CSI-RS may be applied without being ignored.
- a unique feature among the CSI feedbacks that fly the communication scheme of the present invention is that the RI value cannot be greater than the number Ntx of the antenna ports of the CRS or the TRS for the CSI feedback. That is, in case of transmission mode 10, even though a DM-RS based PDSCH of up to 8 bits can be scheduled, a UE larger than Ntx cannot be selected because CSI feedback is performed based on CRS or TRS. . If the UE reported an RI of a value greater than Ntx, the eNB may treat it as an error, or even if it reports an RI of a value greater than Ntx, the tank actually applied may be defined as Ntx.
- the 3-bit DM-RS configuration field may indicate the number of layers.
- the UE may treat it as an error and ignore it or may transmit a NACK for the downlink grant.
- the DMI format 2D has a DM-RS scrambling seed value, and DM having one of values from 0 to 503 as in the prior art. Up to two virtual cell IDs (VCIs) for generating an RS sequence may be included.
- VCIs virtual cell IDs
- the DM-RS scrambling seed value is always the PCKphysical value of the neighbor cell. cell-ID). In other words, the DM—RS scrambling seed value indicated in the downlink grant is It ignores and always generates corresponding DM-RS sequence with PCI of neighbor cell.
- the downlink grant for the corresponding PDSCH may also be received through the EPDCCH.
- EPDCCH means a control channel transmitted through the existing PDSCH region, characterized in that the demodulated based on the DM-RS.
- the 3GPP standard document defines to set multiple EPDCCH search region sets in relation to EPDCCH reception in CoMP mode. In this case, different QCL types may be set for each EPDCCH search region set.
- the DM—RS for the duplicate 2: of the EPDCCH may be defined in advance that the CRS or the TRS and the QCL assumption of the neighboring cell are possible.
- the serving cell estimates an uplink channel based on uplink SRS transmission to a neighbor cell of the UE and Based on the channel symmetry, RI and PMI of the downlink channel can be estimated and applied.
- the neighbor cell needs to transmit information on the uplink channel estimated based on the SRS to the serving cell.
- the semi-proprietary CoMP mode which is the communication method of the present invention, has been described as a special case of the transmission mode 10, but it may be clearly defined as an independent transmission mode.
- An advantage of the communication method of the present invention is that DM—RS-based PDSCH transmission can be performed while preventing resource waste of separately setting and transmitting this CSI-RS resource for CSI feedback on a channel with an adjacent cell. There is this.
- FIG. 12 is a signal flow diagram illustrating a communication scheme according to an embodiment of the present invention.
- the UE signals UE performance information for a specific band or a specific carrier to a serving cell.
- the number of CSI processes supported by the corresponding band or the corresponding carrier that is, P value, is determined. Set to 0 to signal.
- the serving cell receiving this recognizes that the UE wants to operate in the semi-static CoMP mode of the present invention, and transmits CRS related information of the neighbor cell to the UE in step 1203.
- the CRS-related information is preferably transmitted in an RRC signal, which is higher layer signaling.
- the CRS-related information is preferably included in a parameter set for the PQI field. More preferably, the parameter set may include a physical cell ID (PCI) of an adjacent cell.
- PCI physical cell ID
- the UE may receive the CRS from the neighbor cell as in steps 1205 and 1207, and may calculate and report the CSI to the serving cell based on this.
- the UE may receive a DM—RS based PDSCH from the neighbor cell as shown in step 1209.
- the DM-RS for receiving the PDSCH may be a DM-RS capable of a CCL and a QCL assumption received in step 1205, and such DM—RS may be defined in the parameter set.
- FIG. 13 illustrates a block diagram of a communication device according to an embodiment of the present invention.
- the communication device 1300 includes a processor 1310, a memory 1320, an RF module 1330, a display module 1340, and a user interface module 1350.
- the communication device 1300 is shown for convenience of description and some models may be omitted. In addition, the communication device 1300 may further include necessary modules. In addition, some of the hairs in the communication device 1300 may be divided into more granular hairs.
- the processor 1310 is configured to perform an operation according to an embodiment of the present invention illustrated with reference to the drawings. Specifically, the detailed operation of the processor 1310 is described with reference to FIGS.
- the memory 1320 is connected to the processor 1310 and stores an operating system, an application, a program code, data, and the like.
- the RF modules 1330 are connected to the processor 1310 and perform a function of converting a baseband signal into a radio signal or converting a radio signal into a baseband signal. For this purpose, the RF modules 1330 perform analog conversion, amplification, filtering and frequency up conversion or their reverse processes.
- the display module 1340 is connected to the processor 1310 and provides various information. Display.
- the display modules 1340 may use well-known elements such as, but not limited to, a liquid crystal display (LCD), a light emitting diode (LED), and an OLED light emitting diode (OLED).
- the user interface modules 1350 are connected to the processor 1310 and can be configured with a combination of well-known user interfaces such as a keypad, a touch screen, and the like.
- the specific operation described as performed by the base station in this document may be performed by an upper node in some cases. That is, it is apparent that various operations performed for communication with the terminal in a network including 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 may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
- an embodiment of 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 ASICs, specific signal circuits (DSPs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and FPGAs (f). ield programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- firmware or software 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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US14/441,982 US9544112B2 (en) | 2013-03-19 | 2014-03-19 | Method by which terminal transmits and receives signal in multi cell-based wireless communication system, and device for same |
KR1020157011543A KR102169959B1 (ko) | 2013-03-19 | 2014-03-19 | 다중 셀 기반 무선 통신 시스템에서 단말이 신호를 송수신하는 방법 및 이를 위한 장치 |
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US10263741B2 (en) * | 2013-05-10 | 2019-04-16 | Qualcomm Incorporated | Coordinated multipoint (CoMP) and network assisted interference suppression/cancellation |
KR20150107490A (ko) * | 2014-03-14 | 2015-09-23 | 삼성전자주식회사 | 무선통신 시스템에서 간섭 신호 제거 및 억제를 위한 제어정보 전송 방법 및 장치 |
US10856332B2 (en) * | 2017-06-23 | 2020-12-01 | Mediatek Inc. | Method and apparatus for random access channel procedure in wireless communication system |
WO2019022489A1 (en) * | 2017-07-25 | 2019-01-31 | Lg Electronics Inc. | METHOD AND APPARATUS FOR ACK / NACK CHANNEL DESIGN IN WIRELESS COMMUNICATION SYSTEM |
EP3796570A4 (en) * | 2018-05-18 | 2022-01-05 | NTT DoCoMo, Inc. | USER TERMINAL DEVICE AND WIRELESS COMMUNICATION PROCEDURE |
US20190387515A1 (en) * | 2018-06-14 | 2019-12-19 | Google Llc | Post-Grant Beam Tracking |
US11057092B2 (en) | 2018-08-10 | 2021-07-06 | At&T Intellectual Property I, L.P. | Facilitating fast channel state information computation for 5G wireless communication systems |
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