WO2013085135A1 - 무선 통신 시스템에서 데이터 채널을 추정하는 방법 및 이를 위한 장치 - Google Patents
무선 통신 시스템에서 데이터 채널을 추정하는 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
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
- H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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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
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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
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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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
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for estimating a data channel in a wireless communication system.
- a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (LTE)) communication system will be described as an example.
- E-UMTS Evolved Universal Mobile Telecommunications System
- UMTS Universal Mobile Telecommunications System
- LTE Long Term Evolution
- an E-UMTS is a user equipment (UE) and an access gateway connected to an external network at an end point of an eNode B (eNB) and a network (E-UTRAN). AG).
- the base station can transmit multiple data streams simultaneously by using a broadcast service, a multicast service, and / or a unicast service.
- the base station controls data transmission and reception for a plurality of terminals.
- the base station is downlink for downlink (DL) data.
- the link scheduling information is transmitted to inform the corresponding UE 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, so that the time / frequency domain, encoding, data size, and HARQ related to the terminal can be used.
- the core network may be composed of an AG and a network node for user registration of the terminal.
- the AG manages mobility of the terminal in units of a tracking area (TA) composed of a plurality of shells.
- 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 evolutions are 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 estimating a downlink data channel by a terminal in a wireless communication system includes: receiving a downlink control channel using a UE-specific reference signal; Spatial resource for the downlink control channel ⁇ If the spatial resources for the downlink data channel indicated by the downlink control channel are the same, the resource block for the downlink data channel and the downlink control channel Bundling a resource block for a null into one channel estimation unit; And performing channel estimation on the one channel estimation unit based on the terminal specific reference signal.
- the spatial resource is defined by at least one antenna port index for a specific terminal and the number of layers according to the antenna port, and when the spatial resource is the same, an antenna port for the downlink control channel
- the number of indexes and layers and the number of antenna port indexes and layers for the downlink data channel are the same.
- the downlink control channel includes an indication field defining an spatial resource of the downlink data channel, and determines the spatial resource of the downlink data channel according to the definition of the indication field. can do.
- the downlink control channel includes information on a transport block for the downlink data channel, it is possible to determine the spatial resources of the downlink data channel according to the information on the transport block, When the information includes information on a disabled transport block, the spatial resource for the downlink data channel may be determined according to a new data indicator (NDI) of the deactivated transport block.
- NDI new data indicator
- the received power of the downlink control channel is used for each of the downlink data channel I spatial resources. Adjusting to received power; And bundling the resource block for the downlink data channel and the resource block for the downlink control channel into one channel estimation unit.
- a terminal may perform channel estimation by simultaneously using a DM—RS for decoding a control channel and a DM-RS for decoding a data transmission channel.
- FIG. 1 illustrates physical channels used in a 3GPP LTE system as an example of a wireless communication system and a general signal transmission method using the same.
- 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 configuration diagram of a multi-antenna communication 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 resource unit used to configure a downlink control channel in the LTE system.
- FIG. 7 is a diagram illustrating a multi-node system in a next generation communication system.
- 8 is a diagram illustrating a PDSCH scheduled by an E-PDCCH or an E ⁇ PDCCH.
- 9 is a diagram illustrating transmission power according to the number of layers of E-PDCCH and the number of layers of PDSCH.
- FIG. 10 is a diagram illustrating bundling of an E-PDCCH PRB and a PDSCH PRB according to an embodiment of the present invention.
- 11 is an RB boundary when PRB bundling is performed according to an embodiment of the present invention.
- FIG. 12 is a diagram illustrating an I-transmission adjustment of the E-PDCCH PRB when the reception powers of the E-PDCCH PRB and the PDSCH PRB are different according to an embodiment of the present invention.
- B illustrates a base station and a terminal that can be applied to an embodiment of the present invention.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA can be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE) I ”.
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA is an IEEE 802.11 (Wi-Fi), Can be implemented with wireless technologies such as IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), etc.
- ⁇ UTRA is part of Universal Mobile Telecommunications System (UMTS) I.
- 3GPP 3rd Generation Partnership Project
- LTE long term evolution
- E-UMTS Evolved UMTS
- OFDMA is adopted in downlink and SC—FDMA is adopted in uplink.
- LTE-A Advanced is an evolution of 3GPP LTE.
- 3GPP LTE / LTE-A will be described as the main category, but the technical idea of the present invention is not limited thereto.
- specific terms used in the following descriptions are provided to help the understanding of the present invention, and the use of the specific terms may be changed to other forms without departing from the technical spirit of the present invention.
- a user equipment receives information through a downlink (Di) from a base station, and a user equipment transmits information through an uplink (UL) to a base station.
- a downlink Downlink
- UL uplink
- various control information, and various ring channels exist according to the type / use of the information they transmit and receive.
- 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 includes control messages used by a user equipment (UE) and a network to manage a call. It means the transmission path.
- 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 first layer provides an information transfer service to a higher layer by using a physical channel.
- the physical layer is connected to the upper medium access control layer through a trans-antenna port channel. Data is moved between the medium access control layer and the physical layer through the transport channel. Data moves between the physical axis of the transmitting axis and the physical layer on the receiving side.
- 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 second layer medium access control (MAC) layer provides a service to a radio link control (LC) layer, which is a higher layer, through a logical channel.
- the RLC layer of the second layer is reliable data Support transfer.
- the function of the RLC layer may be implemented as a function block inside the MAC.
- the Packet Data Convergence Protocol (PDCP) layer of the second layer performs a header compression function to reduce unnecessary control information in order to efficiently transmit IP packets such as IPv4 or IPv6 in a narrow bandwidth wireless interface.
- PDCP 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.
- Layer C is the Configuration, Re-configuration and Release of Radio Bearers (RBs). ⁇ responsible for controlling logical channels, transport channels, and sound channels.
- 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 terminal and the RRC layer of the network, the terminal is also in the RC Connected Mode, otherwise it is in the 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 (eNB) is set to one of the bandwidth, such as 1.4, 3, 5, 10, 15, 20Mhz to provide a lower or uplink transmission service to multiple terminals. Different shells can be set to provide different bandwidths.
- the downlink transmission channel for transmitting data from the network to the terminal includes a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting paging messages, and a downlink shared channel (SCH) for transmitting user traffic or control messages.
- 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
- the logical channel mapped to the transport channel is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and a multicast traffic channel (MTCH).
- BCCH broadcast control channel
- PCCH paging control channel
- CCCH common control channel
- MCCH multicast control channel
- MTCH multicast traffic channel
- Figure 3 is a ring of channels used in the 3GPP LTE system and using them A diagram for describing a general signal transmission method.
- the user equipment which is powered on again or enters a new shell in the power-on state, performs an initial cell search operation such as synchronizing with the base station in step S301.
- the user equipment receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a shell ID.
- the user equipment may receive a physical broadcast channel from the base station to obtain broadcast information in the shell.
- the user equipment may receive a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state. .
- DL RS downlink reference signal
- the user equipment After completing the initial cell search, the user equipment receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the physical downlink control channel information in step S302. Obtain specific system information. Thereafter, the user equipment may perform a random access procedure such as steps S303 to S306 to complete the access to the base station. In this case, the user equipment may use a physical random access channel.
- a preamble can be transmitted through a PRACH (S303), and a response message to the preamble can be received through a physical downlink control channel and a corresponding physical downlink shared channel (S304).
- contention resolution procedures such as additional physical random access channel transmission (S305) and physical downlink control channel and corresponding physical downlink shared channel reception (S306) may be performed. have.
- the user equipment which has performed the above-described procedure is then referred to as a physical downlink control channel / physical downlink shared channel reception (S307) and a physical uplink shared channel (Physical Uplink Shared Channel).
- PUSCH / Physical Uplink Control Channel (PUCCH) transmission (S308) may be performed.
- the user equipment listens to the control information transmitted to the base station and instructs it as uplink control information (UCI).
- UCI uses HARQ ACK / NAC (Hybrid Automatic Repeat and reQuest) Acknowledgment / Negative-ACK), Scheduling Request (SR), Channel State Information (CSI), and the like.
- HARQ ACK / NACK is simply referred to as HARQ-ACK black or ACK / NACK (A / N).
- HARQ-ACK includes at least one of positive ACK (simply, AC), negative ACK (NACK), DTX, and NACK / DTX.
- the CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indication (RI), and the like.
- CQI Channel Quality Indicator
- PMI Precoding Matrix Indicator
- RI Rank Indication
- UCI is generally transmitted through PUCCH, but may be transmitted through PUSCH when control information and traffic data should be transmitted at the same time. In addition, the UCI may be aperiodically transmitted through the PUSCH by a request / instruction of the network.
- Output is a method of using a plurality of I transmit antennas and a plurality of receive antennas, and the data transmission / reception efficiency can be improved by this method. That is, the transmitting end of the wireless communication system can increase capacity and improve performance by using a plurality of antennas at the receiving end.
- the MIMO hereinafter this document ⁇ may Branch Offices La multiple antennas.
- multi-antenna technology In multi-antenna technology, a single to receive one premise message It does not depend on the antenna path. Instead, in multi-antenna technology, data fragments received from multiple antennas are gathered and merged to complete the data. Using multi-antenna technology, it is possible to improve the data rate within a cell area of a specified size or to increase system coverage while ensuring a specific data rate. 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.
- MIMO multiple antenna
- Transmitter had a transmitting antenna is installed dog ⁇ ⁇ , the receiving end is the receiving antennas N R seolji dog.
- the theoretical channel transmission capacity increases more than when the plurality of antennas are used 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 effect is improved. If the bandwidth transmission rate in the case of using one antenna is R., the transmission rate in the case of using the multiple antennas is theoretically, as shown in Equation 1 below. Rate R 0 times rate increase multiplied by Ri Can increase. Where Ri is the smaller of N T and NR.
- the transmission power can be different for each transmission information W '', S N T , where each transmission power
- the transmission information of which transmission power is adjusted is represented by a vector as shown in Equation 3 below.
- the weighting matrix plays a role of appropriately distributing transmission information to each antenna according to a transmission channel situation. Iojun transmission It can be expressed as shown in Equation 5 below. Where is the weight between the / th transmit antenna and the th information. It is called a weight matrix or a precoding matrix.
- the rank I physical meaning of a channel matrix is different from each other in a given channel. It can be said that the number of sins that can send other information. Therefore, the rank of a channel matrix is defined as the minimum number of independent rows or columns, so the I rank of the matrix is the number of rows or columns. It cannot be bigger.
- the rank (H) of the null matrix H is limited as in Equation 6.
- Equation 7 Equation 7
- # of streams represents the number of streams.
- one stream may be transmitted through more than one antenna.
- mapping one or more streams to multiple antennas This method can be described as follows according to the type of multiple antenna technology.
- a hybrid form of spatial diversity and spatial multiplexing is also possible.
- 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.
- the control channel allocated to the control area is PCFICH (Physical Control Format). Indicator CHannel), PHICH (Physical Hybrid-ARQ Indicator CHannel), PDCCH (Physical Downlink Control CHannel) and the like.
- 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 the control region based on the Cell ID (CeH 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 (QPSK).
- QPSK Quadrature Phase Shift Keying
- PHICH is a physical hybrid-automati repeat and request (HARQ) indicator channel and used to carry HARQ ACK / NACK for uplink transmission. That is, the PHICH indicates a channel through which DL AC / NAC 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
- Modulated ACK / NACK with Spreading Factor (SF) 2 or 4 Spreads.
- 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 time domain.
- the PDCCH is a physical downlink control channel and is allocated to I first n OFDM triplets in a subframe.
- n is indicated by the PCFICH as an integer of 1 or more.
- PDCCH is composed of S ["or more I CCE (Control Channel Element).
- PDCCH is information related to resource allocation of paging channel (PCH) and downlink-shared channel (DL-SCH), uplink scheduling grant (Uplink Scheduling Grant), HARQ information, etc. are informed to each terminal or terminal group PCH (Paging channel) and DL-
- Downlink-shared channel (SCH) through PDSCH! Is sent. Therefore, the base station and the terminal generally except for specific control information or specific service data
- Data is transmitted and received through PDSCH.
- 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.
- PDCCH is CRC masked with Radio Network Temporary Identity (RNTI) of "A”
- radio resource eg, frequency location
- C transmission type information
- FIG. 6 is a diagram illustrating a structure of a reference signal in an LTE system supporting downlink transmission using four antennas.
- Figure 6 (a) shows the case of the normal cyclic prefix (Cyclic Prefix)
- (b) shows the case of an extended circulation battery.
- 0 to 3 described in the grid mean a CRS which is a cell specific reference signal transmitted for channel estimation and data demodulation for each of antenna ports 0 to 3, and the CRS which is the cell specific reference signal. May be transmitted to the terminal not only in the data information area but also in the control information area.
- 'D' described in the grid means that the downlink which is the UE-specific RS is 1-RS, and supports single antenna port transmission through a data region, that is, a PDSCH.
- the terminal is signaled whether the terminal specific RS exists through a higher layer.
- the downlink DM-RS will be described in more detail.
- the base station When the base station transmits downlink data to the terminal, the downlink for channel estimation between the terminal and the base station may transmit the I-RS. As described above, the base station transmits a downlink DM-RS as a terminal specific reference signal, and a pseudo-random sequence as shown in Equations 8 and 9 below. Using Is generated.
- N c 1600
- the first m-sequence has an initial value of Xl (0) is 1 and Xl (n) is 0 (where ⁇ is 1 to 30).
- the initial value of the second m-sequence is
- the reference signal sequence of Equation 8 is a single shell single user ⁇ transmission, single cell multiuser ⁇ transmission, multicell single user Applicable to both ⁇ transport and multi-shell multi-user ⁇ transport.
- Cinit the initial value of the second m-sequence used, may be defined separately.
- the scramble classification parameter ⁇ DRS is further included as a factor.
- N may be set to a value of 1 when the I cell specific reference coral and the I-RS exist in the same OFDM symbol, and otherwise, may be set to have a value of 0.
- the DRS is a DCI format received through the PDCCH.
- WRNTI can be set to 0 by SPS-RNTI for semi-persistent transmission and C-RNTI for non-persistent transmission, but according to DM-RS multiplexing. have.
- init may be defined as in Equation 10 below.
- parameters such as a cyclic shift value and rank information for transmitting a downlink DM-RS by the base station are signaled through downlink information transmitted through the PDCCH.
- BS Base Station
- ABS Advanced BS
- NB Node-B
- eNode-B eN B
- Access Point AP
- FIG. 7 is a diagram illustrating a multi-node system in a next generation communication system.
- the system is a distributed multi-node system forming one cell. (distributed multi node system; this VI NS).
- VI NS distributed multi node system
- individual nodes may be given separate Node IDs, or may operate as some antennas within a cell without a separate Node ID.
- nodes have different shell identifiers (IDs) It can be seen as a multi-shell system. If such a multi-cell is configured in an overlapping form, it is called a multi-tier network.
- IDs shell identifiers
- Node-B Node-B, eNode-B, PeNB), HeNB, RH (Remote Radio Head), relay and distributed antenna can be a node, one node is installed in place one antenna. Nodes are also called transmission points.
- a node generally refers to an antenna group separated by a predetermined interval or more, but in the present invention, the node may be applied even if the node is defined as an arbitrary antenna group regardless of the interval.
- E-PDCCH Enhanced-PDCCH
- PSCHCH region the data region
- the E-PDCCH is not provided to the legacy legacy terminal, but can be received only by the LTE-A terminal. ⁇
- FIG. 8 is a diagram illustrating a PDSCH scheduled by an E-PDCCH or an I "E-PDCCH.
- the E-PDCCH may generally define and use a portion of a PDSCH region for transmitting data, and the UE should perform a blind decoding process for detecting its E-PDCCH. .
- the E-PDCCH performs the same scheduling operation as the conventional PDCCH I "(i.e. PDSCH and PUSCH control), but if the number of UEs connected to the same node as the RRH increases, the E-PDCCH becomes more E-PDCCH in the PDSCH region. In this case, there may be a disadvantage in that the complexity may increase due to an increase in the number of blind decodings to be performed by the UE.
- a transmission mode (TM) in a TDD wireless communication system will be described.
- a transmission mode is set by an upper layer in order to decode a PDCCH received by a UE together with CRC O I ".
- the UE performs a decoding on the PDCCH error corresponding to each combination defined in Table 1. That is, a search space is set in the DCI format detected by the UE, and the I transmission scheme is changed by PDSCH. Perform the decode. For example, when the UE set to transmission mode 3, 4, 8, or 9 detects a DCI corresponding to the format 1A, it will be assumed that PDSCH transmission is enabled for transport block 1 but transport block 2 is deactivated. .
- the detected DCI format may be divided into DCI format 1A and DCI format 2B.
- the search space is a UE specific search space according to a common search space and a C-RNTI (Cell Radio-Network Temporary Identifier). Is set.
- the PDSCH transmission scheme uses port # 0 when the number of physical broadcast channel (PBCH) antenna ports is one, that is, a single antenna port, and otherwise, a transmit diversity scheme is used. It is set to use.
- the search space is set as a UE Specific Search Space according to a Cell Radio-Network Temporary Identifier (C-RNTI).
- C-RNTI Cell Radio-Network Temporary Identifier
- the terminal The dual layer transmission method using the antenna ports # 1 and # 8 is used, or the single-antenna port transmission method using the antenna ports # 7 or # 8 is used.
- the detected DCI format may be divided into DCI format 1A and DCI format 2B.
- the search space is a UE specific search space according to a common search space and a C-RNTI (Cell Radio-Network Temporary Identifier). Is set.
- the PDSCH transmission scheme is set differently depending on whether the MBSFN subframe is used. In case of MBSFN subframe, when the number of Physical Broadcast Channel (PBCH) antenna ports is one, that is, single antenna port, port # 0 is used. Otherwise, the transmit diversity scheme is used. It is set to use. If it is not an MBSFN subframe, it is set as a PDSCH transmission scheme using antenna port # 7 as a single antenna port.
- PBCH Physical Broadcast Channel
- search The search space is set to a UE specific search space according to a Cell Radio-Network Temporary Identifier (C-RNTI).
- C-RNTI Cell Radio-Network Temporary Identifier
- the PDSCH transmission scheme may be configured to use up to eight layers corresponding to antenna ports # 7 to # 14, or to use a single antenna port using antenna ports # 7 or # 8.
- PB bundling means that a terminal configured in transmission mode 9 is configured as one granularity for precoding a plurality of resource blocks on a frequency dimension in order to perform PMI / RI reporting. It is assumed.
- the system bandwidth is divided into a fixed system bandwidth according to the size P ′ of the Precoding Resource Block Groups (PRGs), and each PRG is successively composed of PRBs. If modP '> 0, the rOL of the PRG of one of the precoding resource block groups (PRGs)
- the size is ⁇ RB- ⁇ 'i p '. to be.
- the LTE system defines the PRB size assumed by the UE for a given system bandwidth as shown in Table 2 below.
- the UE may assume that the same precoder may be applied to all scheduled PRBs belonging to one PRG.
- the terminal is the transport layer of the E-PDCCH (or ranks) the number and PDSCH coming from the i ", the channel estimation of the DM-RS-based through the ditch PRB bundle is performed when the same number of transmission layers.
- the UE performs DM-RS based channel estimation through PRB bundling when the number of transport layers (or ranks) of the E-PDCCH and the number of transport layers of the PDSCH are the same. Suggest to do.
- FIG. 9 illustrates transmit power according to the number of I layers in an E-PDCCH and the number of I layers in a PDSCH.
- PRB bundling it is desirable to consider transmission power distribution according to the number of E-PDCCH layers and the number of I layers of PDSCH. This is because when the DM-RS-based E-PDCCH transmission power is different and the I / PDSCH transmission power is different, even if the same antenna port is used, bundling cannot be performed due to the difference in reception power.
- E-PDCCH antenna port # 7 in RB # 0 of FIG. 9 is transmitted with a transmission power of 'P' using a corresponding layer.
- the E-PDCCH or I "PDSCH must have the same energy per RE (EPRE), so the PDSCH is the two antenna ports # 7 and # 8.
- ⁇ E-PDCCH uses the same port (for example, port # 7), but bundling may be performed due to a difference in transmission power. It becomes impossible.
- PRB bundling of the E-PDCHC transmission PRB and PDSCH transmission PRBs through interpretation of the detected DCI Suggest ways to do it. That is, when the detected DCI is format 2C (TM9), support
- FIG. 10 illustrates an example in which an E-PDCCH PRB and a PDSCH PRB are bundled according to a first embodiment of the present invention.
- the UE may be configured to include an antenna port (s), a scrambling identity, and a layer included in the detected DCI
- the number of layers of the scheduled PDSCH can be known by analyzing the number of layers.
- DCI The interpretation of the indication field consisting of bits of format 2C is defined in Table 3.
- the UE may know that the number of scheduled PDSCH layers is one and is transmitted using antenna port # 7.
- the UE (UE) has one layer of E-PDCCH, and when the antenna port for the E-PDCCH is the same as the antenna port for the PDSCH, the UE (UE) bundles between the PRB for the E-PDCCH and the PRB for the PDSCH. Do this. For example, as shown in FIG. 9, when the E-PDCCH is transmitted using the antenna port # 7 and the PDSCH scheduled through the E-PDCCH is also transmitted to the antenna port # 7 only, PRB bundling is performed. However, as shown in FIG. 9, when the E-PDCCH is transmitted to antenna port # 7 and the PDSCH is transmitted to antenna ports ⁇ # 7, # 8 ⁇ , the UE UE is used for DM transmission of the E-PDCCH. — RS cannot be used for channel estimation of PDSCH. In this case, because of the I-transmission power, even this I-RS transmitted to the same port (antenna port # 7) cannot be bundled.
- DCI obtained by detecting the E-PDCCH by the UE is DCI format 2B
- PRB bundling of the E-PDCCH transmission PRB and PDSCH transmission PRBs through interpretation of the detected DCI Suggest a solution. That is, when the detected DCI is in format 2B (TM8), it is possible to transmit only up to two layers according to dual layer beamforming. Therefore, by analyzing the number of transport blocks, when the number of layers of the scheduled PDSCH and the number of layers of the E-PDCCH are the same, channel estimation through PRB bundling is performed.
- the antenna port used with the transmission layer through the analysis of the number of transmission blocks transmitted It can be seen. If the number of transmitted transport blocks is 2, it can be seen that the UE has two layers and uses antenna ports # 7 and # 8. Therefore, in this case, PRB bundling is possible only when the E-PDCCH is transmitted in two layers, and all UE reference signals (DM-RS) may be used for channel estimation. .
- DM-RS UE reference signals
- the UE can find out information about the antenna port for PDSCH transmission using the indication field of the disabled transport block.
- the information on the antenna port can be known by analyzing the New Data Indicator (NDI) included in the deactivated transport block according to DCI Format 2B.
- NDI New Data Indicator
- a single transport block may be transmitted to antenna port # 7, or antenna port # 8, and the UE may transmit the inactive call I ′′ transport block.
- New Data Indicator NDI
- the antenna port for PDSCH transmission is # 7 when the NDI indicates 0.
- the UE may perform PRB bundling when E—PDCCH is transmitted to one layer, antenna port # 7. At this time, the transmission power of the E-PDCCH transmission power and the PDSCH are the same.
- RB # 0 for E-PDCCH
- PDSCH are RB # 1 may perform bundling, wherein the boundary of RB # 0 is called RB edge # 0, RB edge # 1, and the boundary of RB # 1 is called RB boundary.
- (RB edge) # 2 RB edge # 3 RB # 0 and RB # 1 through PRB bundling, RB edge # 1, RB edge # 2 No longer corresponds to the boundary of the RB.
- the UE when the number of transport layers (or ranks) of the E-PDCCH and the number of transport layers of the PDSCH are different, the UE performs PRB bundling by adjusting the received power.
- the base station transmits using normal power, but when the transmit power of the E-PDCCH and the I transmit power of I "PDSCH are different, the terminal may adjust the received power to perform PRB bundling.
- reception power adjustment according to the embodiment I of the present invention will be described.
- an E-PDCCH is transmitted to one layer, antenna port # 7, and a UE-specific reference signal (DM-RS) is transmitted with a power of 'P'.
- the UE-specific reference signal (DM-RS) will be transmitted at 'P / 2' power, respectively.
- the UE (UE) reduces the UE-specific reference signal (DM-RS) reception power of the E-PDCCH transmission PRB by 1/2 to equal the power reception of PDSCH.
- PRB bundling may be performed by adjusting.
- FIG. 13 illustrates a base station and a user equipment that can be applied to an embodiment of the present invention.
- a relay When a relay is included in the wireless communication system, communication is performed between the base station and the relay in the backhaul link, and communication is performed between the relay-off user equipment in the access link. Accordingly, the base station or user equipment illustrated in the figure may be replaced by a relay in accordance with a situation.
- a wireless communication system includes a base station (BS) 110 and a user equipment (UE) 120.
- Base station 110 includes a processor 112, a memory 114, and a radio frequency (RF) unit 116.
- the processor 112 may be configured to implement the procedures and / or methods proposed in the present invention.
- the memory 114 is connected with the processor 112 and stores various information related to the operation of the processor 112.
- the RF unit 116 is connected with the processor 112 and transmits and / or receives a radio signal.
- User device 120 includes a processor 122, a memory 124, and an RF unit 126.
- the processor 122 may be configured to implement the procedures and / or methods proposed in the present invention.
- the memory 124 is connected with the processor 122 and stores various information related to the operation of the processor 122.
- the RF unit 126 is connected with the processor 122 and transmits a radio signal. Transmit and / or receive.
- Base station 110 and / or user equipment 120 may have a single antenna or multiple antennas.
- Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- one embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), Digital signal processing devices (DSPs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPs 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 modules, procedures, functions, etc. that perform 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.
- the UE-specific reference signal (DM-RS) for I decoding in the control channel of the terminal and the corresponding data transmission channel A method and apparatus for performing channel estimation using DM-RS for decoding at the same time have been described with reference to the example applied to 3GPP LTE system, but can be applied to various wireless communication systems in addition to 3GPP LTE system. .
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US14/362,362 US9426798B2 (en) | 2011-12-08 | 2012-08-23 | Method for estimating data channel in wireless communication system, and apparatus for same |
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TWI431990B (zh) | 2006-01-11 | 2014-03-21 | Interdigital Tech Corp | 以不等調變及編碼方法實施空時處理方法及裝置 |
US9526091B2 (en) * | 2012-03-16 | 2016-12-20 | Intel Corporation | Method and apparatus for coordination of self-optimization functions in a wireless network |
GB2501080A (en) * | 2012-04-11 | 2013-10-16 | Sca Ipla Holdings Inc | Telecommunication apparatus and methods |
EP2920934B1 (en) * | 2012-11-14 | 2020-12-23 | Telefonaktiebolaget LM Ericsson (publ) | Pilot signal transmission method, associated transmit-receive point, pilot signal reception method and associated user equipment |
WO2018182248A1 (ko) * | 2017-03-25 | 2018-10-04 | 엘지전자 주식회사 | 무선 통신 시스템에서 단말의 위상 트래킹 참조 신호 수신 방법 및 이를 지원하는 장치 |
US10554359B2 (en) | 2017-03-25 | 2020-02-04 | Lg Electronics Inc. | Method of receiving phase tracking reference signal by user equipment in wireless communication system and device for supporting same |
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US9426798B2 (en) | 2016-08-23 |
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KR20140113925A (ko) | 2014-09-25 |
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