WO2013015653A4 - 다중 노드 시스템에서 상향링크 기준 신호 전송 방법 및 그 방법을 이용하는 단말 - Google Patents
다중 노드 시스템에서 상향링크 기준 신호 전송 방법 및 그 방법을 이용하는 단말 Download PDFInfo
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- WO2013015653A4 WO2013015653A4 PCT/KR2012/006023 KR2012006023W WO2013015653A4 WO 2013015653 A4 WO2013015653 A4 WO 2013015653A4 KR 2012006023 W KR2012006023 W KR 2012006023W WO 2013015653 A4 WO2013015653 A4 WO 2013015653A4
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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
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L23/00—Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00
- H04L23/02—Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00 adapted for orthogonal signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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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 wireless communication, and more particularly, to a method for transmitting an uplink reference signal, which can reduce interference in a multi-node system, and a terminal using the method.
- M2M machine-to-machine
- a carrier aggregation technique, a cognitive radio technique, and the like that efficiently use more frequency bands in order to satisfy a required high data transmission amount, and a multi-antenna technology and a multi-base-station cooperation Technology and the like have recently emerged.
- the wireless communication network evolves toward a higher density of nodes that can access the user.
- the node means an antenna or a group of antennas separated by a predetermined distance or more in a distributed antenna system (DAS), but is not limited to this meaning and can be used in a broader sense. That is, the node may be a pico-cell base station (PeNB), a home base station (HeNB), a remote radio head (RRH), a remote radio unit (RRU) Wireless communication systems with such high density nodes can exhibit higher system performance by cooperation between nodes.
- PeNB pico-cell base station
- HeNB home base station
- RRH remote radio head
- RRU remote radio unit
- each node when each node operates as an independent base station (BS, Advanced BS (ABS), Node-B (NB), eNode-B (eNB), Access Point (AP) If each node manages transmission and reception by one control station and operates as an antenna or antenna group for one cell, much better system performance can be obtained.
- BS Advanced BS
- NB Node-B
- eNB eNode-B
- AP Access Point
- a plurality of nodes can use one physical cell identifier (ID). This reduces the number of handovers and facilitates cooperative communication between the nodes.
- ID physical cell identifier
- a terminal generates various uplink signals based on a physical cell ID used by a base station or a node.
- a physical cell ID used by a base station or a node.
- interference between uplink signals increases.
- interference between uplink reference signals may be a problem.
- the present invention provides a method for transmitting an uplink reference signal in a multi-node system and a terminal using the method.
- a method for transmitting an uplink reference signal in a multi-node system includes receiving a synchronization signal from a node; Receiving a parameter for a virtual cell identifier from the node; Generating an uplink demodulation reference signal (DM-RS) using parameters for the virtual cell ID; And transmitting the generated uplink DM-RS to the node, wherein the physical cell ID is a cell ID received from the synchronization signal, and the parameter for the virtual cell ID replaces the physical cell ID, And is a parameter used for generating an uplink DM-RS.
- DM-RS uplink demodulation reference signal
- the parameter for the virtual cell ID may be a UE-specific parameter that is different for each UE.
- the uplink DM-RS is generated by cyclically shifting a base sequence selected from a sequence group of a plurality of sequence groups, and each of the plurality of sequence groups may include at least one base sequence.
- the cyclic shift may be determined based on parameters for the virtual cell ID.
- the uplink DM-RS is transmitted in at least two slots in a frame including a plurality of slots in a time domain, and one sequence group is selected for each slot in the at least two slots, and in the selected one sequence group Can be generated by cyclically shifting one selected base sequence.
- One sequence group selected for each slot may be determined based on parameters for the virtual cell ID.
- the basic sequence selected in one sequence group determined for each slot may be determined based on parameters for the virtual cell ID.
- the parameter for the virtual cell ID includes a virtual cell ID having any one of integer values from 0 to 513, and the virtual cell ID replaces the physical cell ID to be used for generating the uplink DM-RS .
- the physical cell ID can be used for generating uplink signals except for the DM-RS.
- the parameters for the virtual cell ID may be transmitted through a radio resource control (RRC) message.
- RRC radio resource control
- the method may further comprise receiving uplink scheduling information from the node, wherein parameters for the virtual cell ID may be generated based on parameters included in the uplink scheduling information.
- the uplink scheduling information includes information indicating a frequency band through which the MS transmits an uplink data channel, and the frequency band is allocated to a frequency band of another terminal transmitting an uplink data channel and a DM- And a band overlapping with < / RTI >
- the DM-RS may be transmitted in the 4th and 11th SC-FDMA symbols in an uplink subframe including 14 single carrier-frequency division multiple access (SC-FDMA) symbols.
- SC-FDMA single carrier-frequency division multiple access
- the DM-RS may be transmitted in the third and ninth SC-FDMA symbols in an uplink subframe including 12 single carrier-frequency division multiple access (SC-FDMA) symbols.
- SC-FDMA single carrier-frequency division multiple access
- a terminal for transmitting an uplink demodulation reference signal includes a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor coupled to the RF unit, the processor receiving a synchronization signal from a node, receiving a parameter for a virtual cell ID from the node, and using the parameter for the virtual cell ID to increment (DM-RS) and transmits the generated uplink DM-RS to the node, wherein the physical cell ID is a cell ID received from the synchronization signal, and the virtual cell ID Is a parameter used to generate the uplink DM-RS by replacing the physical cell ID.
- RF radio frequency
- the MS can generate an uplink signal using the physical cell ID and the virtual cell ID provided for each MS.
- the uplink reference signal can be generated based on the virtual cell ID.
- interference can be reduced when a plurality of terminals generate the uplink reference signal using the same physical cell ID.
- FIG. 1 shows an example of a multi-node system.
- Figure 2 shows a multi-node system using the same physical cell ID.
- 3 shows a structure of a radio frame in 3GPP LTE.
- FIG. 4 is an exemplary diagram illustrating a resource grid for one slot.
- 5 shows a structure of a downlink sub-frame.
- FIG. 6 shows an OFDM symbol for transmitting a synchronization signal and a PBCH in a radio frame in a Frequency Division Duplex (FDD) system.
- FDD Frequency Division Duplex
- FIG. 7 shows a structure of an uplink sub-frame.
- FIG. 9 shows a DM-RS transmission method according to an embodiment of the present invention.
- FIG. 10 shows a configuration of a base station and a terminal according to an embodiment of the present invention.
- FIG. 1 is a block diagram of a mobile communication system according to an embodiment of the present invention. And may be used in a variety of multiple access schemes as well.
- CDMA may be implemented in radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- the TDMA may be implemented in a wireless technology such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented in wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Evolved UTRA (E-UTRA).
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA, adopting OFDMA in downlink and SC-FDMA in uplink.
- LTE-A Advanced is the evolution of LTE.
- FIG. 1 shows an example of a multi-node system.
- a multi-node system includes a base station and a plurality of nodes.
- a base station generally refers to a fixed station that communicates with a terminal and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
- eNB evolved-NodeB
- BTS base transceiver system
- the base station can be connected to a plurality of nodes to control each node.
- the node may be a macro base station, a pico cell base station (PeNB), a home base station (HeNB), a remote radio head (RRH), a repeater, or a distributed antenna. These nodes are also referred to as points.
- the system may be a distributed antenna system (DAS) system .
- DAS distributed antenna system
- individual nodes may be given separate node IDs or may operate as some antenna groups in a cell without a separate node ID.
- DAS distributed antenna system
- the distributed antenna system is different from the conventional CAS in that the antennas of the base station are concentrated at the cell center.
- a multi-node system if individual nodes have individual cell IDs and perform scheduling and handover, this can be viewed as a multi-cell (e.g., macrocell / femtocell / picocell) system. If these multiple cells are configured to overlap according to their coverage, this is called a multi-tier network.
- a multi-cell e.g., macrocell / femtocell / picocell
- Figure 2 shows a multi-node system using the same physical cell ID.
- node 1 may be a macro base station and nodes 2 through 5 may be RRH. Nodes 1 to 5 may use the same physical cell ID.
- the UE can transmit uplink signals to different nodes according to its location. For example, terminal 1 may transmit an uplink signal to node 2, and terminal 2 may transmit an uplink signal to node 3.
- terminal 1 may transmit an uplink signal to node 2
- terminal 2 may transmit an uplink signal to node 3.
- MU-MIMO multi-user multi-input multi-output
- the BS or the node determines through the uplink DM-RS (demodulation reference signal) whether the UE has used the precoding matrix and which UL channel.
- the DM-RS is a reference signal related to the uplink data channel or the control channel transmitted by the UE.
- the uplink DM-RSs transmitted by the UEs should not interfere with each other as much as possible so that the base station or the node can accurately estimate the effective channel for each UE, thereby eliminating interference and facilitating data reception.
- 3 shows a structure of a radio frame in 3GPP LTE.
- a radio frame is composed of 10 subframes, and one subframe is defined as two consecutive slots.
- the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
- TTI transmission time interval
- the frequency division duplex (FDD) is divided into a downlink in which each node or a base station transmits a signal to a mobile station and a uplink in which a mobile station transmits signals to each node or a base station in a frequency domain.
- TDD time division duplex
- the same frequency band can be used for downlink and uplink between each node (or base station) and a terminal, and is classified in time domain.
- FIG. 4 is an exemplary diagram illustrating a resource grid for one slot.
- one slot includes a plurality of OFDM symbols in a time domain and N RB resource blocks in a frequency domain.
- one slot includes 7 OFDMA symbols and one resource block (RB) includes 12 subcarriers in the frequency domain, but the present invention is not limited thereto.
- Each element on the resource grid is called a resource element (RE).
- the resource element on the resource grid can be identified by an in-slot index pair (k, l).
- the number N DL of resource blocks included in the downlink slot is dependent on the downlink transmission bandwidth set in the cell.
- 5 shows a structure of a downlink sub-frame.
- the downlink subframe is divided into a control region and a data region in a time domain.
- the control region includes up to four OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
- a PDCCH (Physical Downlink Control Channel) and another control channel are allocated to the control region, and a physical downlink shared channel (PDSCH) is allocated to the data region.
- PDSCH Physical downlink shared channel
- a physical channel in 3GPP LTE / LTE-A includes a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and a physical downlink control channel (PDCCH) , Physical Control Format Indicator Channel (PCFICH), Physical Hybrid-ARQ Indicator Channel (PHICH), and Physical Uplink Control Channel (PUCCH).
- PDSCH physical downlink shared channel
- PUSCH physical uplink shared channel
- PDCCH physical downlink control channel
- PCFICH Physical Control Format Indicator Channel
- PHICH Physical Hybrid-ARQ Indicator Channel
- PUCCH Physical Uplink Control Channel
- the PCFICH transmitted in the first OFDM symbol of the DL subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (i.e., the size of the control region) used for transmission of the control channels in the subframe.
- CFI control format indicator
- the UE first receives the CFI on the PCFICH, and then monitors the PDCCH.
- PCFICH does not use blind decoding, but is transmitted via fixed PCFICH resources in the subframe.
- the PHICH carries a positive-acknowledgment (ACK) / negative-acknowledgment (NACK) signal for a hybrid automatic repeat request (HARQ).
- ACK positive-acknowledgment
- NACK negative-acknowledgment
- HARQ hybrid automatic repeat request
- the ACK / NACK signal for UL (uplink) data on the PUSCH transmitted by the UE is transmitted on the PHICH.
- the control information transmitted through the PDCCH is referred to as downlink control information (DCI).
- DCI includes scheduling information such as resource allocation (also referred to as DL grant) of the PDSCH, resource allocation (referred to as UL grant) of the PUSCH, transmission power for individual UEs in any UE group A set of control commands, and / or activation of Voice over Internet Protocol (VoIP).
- resource allocation also referred to as DL grant
- UL grant resource allocation of the PUSCH
- VoIP Voice over Internet Protocol
- blind decoding is used to detect PDCCH.
- Blind decoding is a method for checking whether a corresponding PDCCH is a control channel by checking a CRC error by demodulating a desired identifier in a cyclic redundancy check (CRC) of a received PDCCH (referred to as a candidate PDCCH) .
- CRC cyclic redundancy check
- the base station determines the PDCCH format according to the DCI to be transmitted to the UE, attaches the CRC to the DCI, and masks the CRC with a unique identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or use of the PDCCH .
- RNTI Radio Network Temporary Identifier
- the control region in the subframe includes a plurality of control channel elements (CCEs).
- the CCE is a logical allocation unit used to provide the PDCCH with the coding rate according to the state of the radio channel, and corresponds to a plurality of resource element groups (REGs).
- a REG includes a plurality of resource elements.
- the format of the PDCCH and the number of bits of the possible PDCCH are determined according to the relationship between the number of CCEs and the coding rate provided by the CCEs.
- One REG includes four REs, and one CCE includes nine REGs.
- ⁇ 1, 2, 4, 8 ⁇ CCEs can be used to construct one PDCCH, and each element of ⁇ 1, 2, 4, 8 ⁇ is called a CCE aggregation level.
- the number of CCEs used for transmission of the PDDCH is determined by the base station according to the channel state. For example, a UE having a good downlink channel state can use one CCE for PDCCH transmission. For a UE having a poor downlink channel state, eight CCEs can be used for PDCCH transmission.
- a control channel composed of one or more CCEs performs REG interleaving and is mapped to a physical resource after a cyclic shift based on a cell ID is performed.
- FIG. 6 shows an OFDM symbol for transmitting a synchronization signal and a PBCH in a radio frame in a Frequency Division Duplex (FDD) system.
- FDD Frequency Division Duplex
- a primary synchronization signal is transmitted through the last OFDM symbol of a 0th slot and a 10th slot in a frame.
- PSS Primary Synchronization Signal
- the same PSS is transmitted through the two OFDM symbols.
- the PSS is used to obtain time domain synchronization and / or frequency domain synchronization such as physical cell ID, OFDM symbol synchronization, and slot synchronization.
- the Zadoff-Chu (ZC) sequence can be used as the PSS, and the wireless communication system has at least one PSS.
- the SSS (Secondary Synchronization Signal) is transmitted through the immediately preceding OFDM symbol in the last OFDM symbol of the 0th slot and the 10th slot in the frame. That is, the SSS and the PSS can be transmitted through contiguous OFDM symbols. In addition, the SSS transmits different SSSs through two transmitted OFDM symbols.
- the SSS is used to obtain physical cell ID, frame synchronization, and / or cell CP configuration, i.e., usage information of a normal CP or an extended CP.
- the m-sequence can be used in SSS.
- One OFDM symbol includes two m-sequences. For example, when one OFDM symbol includes 63 subcarriers, two m-sequences of length 31 are mapped to one OFDM symbol.
- the N cell ID can be obtained by the following equation (1).
- N cell ID 3N (1) ID + N (2) ID
- the N (2) ID represents the physical layer ID in one of 0 to 2, and is obtained through PSS.
- the N (1) ID represents the cell group ID in one of 0 to 167, and is obtained through SSS.
- the PBCH Physical Broadcast Channel
- the PBCH is located in the subframe 0 (first subframe) of the radio frame in the time domain.
- the PBCH may be transmitted in the second slot of subframe 0, that is, the first four OFDM symbols of slot 1 (from OFDM symbol 0 to OFDM symbol 3).
- the PBCH can be transmitted over 72 consecutive subcarriers in the frequency domain.
- the PBCH carries a limited number of parameters that are essential for the most frequently transmitted initial cell connections. It is the master information block (MIB) that contains these essential parameters. Each MIB transmission in the PBCH spreads at a period of 40ms. That is, it is transmitted in four consecutive frames. This is to avoid losing an entire MIB.
- MIB master information block
- FIG. 7 shows a structure of an uplink sub-frame.
- an uplink subframe may be divided into a control region and a data region in a frequency domain.
- a PUCCH Physical Uplink Control Channel
- a data area is allocated a physical uplink shared channel (PUSCH) for transmitting uplink data and / or uplink control information.
- PUSCH physical uplink shared channel
- the control area can be called a PUCCH area
- the data area can be called a PUSCH area.
- the UE may support simultaneous transmission of PUSCH and PUCCH, or may not support simultaneous transmission of PUSCH and PUCCH.
- the PUSCH is mapped to an uplink shared channel (UL-SCH) which is a transport channel.
- the uplink data transmitted on the PUSCH may be a transport block that is a data block for the UL-SCH transmitted during the TTI.
- the transport block may be user information.
- the uplink data may be multiplexed data.
- the multiplexed data may be a multiplexed transport block for UL-SCH and UL control information.
- uplink control information multiplexed in uplink data includes a channel quality indicator (CQI), a precoding matrix indicator (PMI), a hybrid automatic repeat request (HARQ), an acknowledgment / not acknowledgment (ACK / NACK) Rank Indicator, and precoding type indication (PTI).
- CQI channel quality indicator
- PMI precoding matrix indicator
- HARQ hybrid automatic repeat request
- ACK / NACK acknowledgment / not acknowledgment
- ACK / NACK precoding type indication
- a PUCCH for one UE is allocated as a resource block pair (RB pair) in a subframe.
- the resource blocks belonging to the resource block pair occupy different subcarriers in the first slot and the second slot.
- the frequency occupied by the resource blocks belonging to the resource block pair allocated to the PUCCH is changed based on the slot boundary. It is assumed that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
- the UE transmits the uplink control information through different subcarriers according to time, thereby obtaining a frequency diversity gain.
- the UE generates a PUSCH signal through scrambling, modulation, mapping to a transmission layer, precoding, mapping to a resource element, and SC-FDMA signal generation.
- the sequence used for scrambling is generated based on the UE-specific ID (RNTI for the UE) and the physical cell ID.
- the uplink reference signal will be described below.
- the reference signal is typically transmitted in a sequence.
- the reference signal sequence may be any sequence without any particular limitation.
- the reference signal sequence may use a PSK-based computer generated sequence (PSK) based on a PSK (Phase Shift Keying).
- PSKs include Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK).
- BPSK Binary Phase Shift Keying
- QPSK Quadrature Phase Shift Keying
- the reference signal sequence may use a Constant Amplitude Zero Auto-Correlation (CAZAC) sequence.
- Examples of the CAZAC sequence include a ZC-based sequence, a ZC sequence with a cyclic extension, a truncation ZC sequence (ZC sequence with truncation), and the like .
- the reference signal sequence may use a PN (pseudo-random) sequence.
- PN sequences include m-sequences, computer generated sequences, Gold sequences, and Kasami sequences.
- the reference signal sequence may use a cyclically shifted sequence.
- the uplink reference signal may be divided into a demodulation reference signal (DM-RS) and a sounding reference signal (SRS).
- DM-RS is a reference signal used for channel estimation for demodulating a received signal.
- the DM-RS may be combined with the transmission of the PUSCH or PUCCH.
- SRS is a reference signal transmitted from a mobile station to a base station for uplink scheduling. The base station estimates the uplink channel through the received sounding reference signal and uses the estimated uplink channel for uplink scheduling.
- the SRS is not combined with the transmission of the PUSCH or PUCCH.
- a basic sequence of the same kind can be used for DM-RS and SRS.
- the precoding applied to the DM-RS may be the same as the precoding applied to the PUSCH.
- Cyclic shift separation is a primary scheme for multiplexing DM-RSs.
- the SRS may not be precoded and may also be an antenna-specific reference signal.
- the reference signal sequence r u, v ( ⁇ ) (n) can be defined on the basis of the basic sequence b u, v (n) and the cyclic shift ⁇ by Eq.
- N sc RB denotes the size of a resource block expressed by the number of subcarriers in the frequency domain, and N RB max and UL denote the maximum value of the uplink bandwidth represented by a multiple of N sc RB .
- the plurality of reference signal sequences may be defined by applying a cyclic shift value a differently from one basic sequence.
- the basic sequence b u, v (n) is divided into a plurality of groups, where u ⁇ ⁇ 0, 1, ... , 29 ⁇ denotes a group index, and v denotes a basic sequence index in the group.
- the base sequence depends on the length of the base sequence (M sc RS ).
- the sequence group index u and the basic sequence index v in the group may change over time, such as group hopping or sequence hopping, which will be described later.
- the basic sequence can be defined by Equation 3.
- Equation 3 q represents the root index of the ZC (Zadoff-Chu) sequence.
- N ZC RS is the length of the ZC sequence and can be given as a prime number less than M sc RS .
- the ZC sequence, which is the root index q, can be defined by Equation 4.
- the basic sequence can be defined by Eq. 6.
- the hopping of the reference signal can be applied as follows.
- the sequence group index u according to the slot index n s can be defined based on the group hopping pattern f gh (n s ) and the sequence shift pattern f ss according to Equation (7).
- Seventeen different group hopping patterns and thirty different sequence shift patterns may exist. Whether group hopping is applied can be indicated by an upper layer.
- PUCCH and PUSCH may have the same group hopping pattern.
- the group hopping pattern f gh (n s ) can be defined by Eq.
- Equation 8 c (i) is a pseudo-random sequence which is a PN sequence and can be defined by a Gold sequence of length-31. Equation 9 shows an example of the gold sequence c (n).
- Nc 1600
- x 1 (i ) is the m- sequence of claim 1
- x 2 (i) it is the m- sequence of claim 2.
- the first m-sequence or the second m-sequence may be initialized according to a cell ID, a slot number in one radio frame, an SC-FDMA symbol index in a slot, a CP type, .
- a pseudo-random sequence generator is provided at the beginning of each radio frame Lt; / RTI >
- PUCCH and PUSCH can have the same sequence shift pattern.
- the sequence shift pattern f ss PUCCH N ID cell mod 30 of the PUCCH .
- Sequence hopping can only be applied to a reference signal sequence longer than 6N sc RB .
- the basic sequence index v in the basic sequence group is given as 0.
- the base sequence index v in the base sequence group of slot index n s can be defined by Equation 10.
- c (i) can be represented by the example of Equation 9, and the application of the sequence hopping can be indicated by an upper layer.
- a pseudo-random sequence generator is provided at the beginning of each radio frame Lt; / RTI >
- the DM-RS sequence for the PUSCH can be defined by Eq. 11.
- M sc RS M sc PUSCH , sequence Is defined by Equation (2).
- DMRS is a value given by a cyclic shift field for the DMRS contained in the most recent uplink-related DCI for the transport blocks associated with the PUSCH transmitted by the Table 3, n (1 )
- the DMRS is a value given by the following Table 4 according to the parameter 'cyclicShift' given in the upper layer signal.
- n PN (n s ) is given by the following equation.
- the pseudo-random sequence c (i) in Eq. 13 is defined by Eq.
- a pseudo-random sequence generator is provided at the beginning of each radio frame Lt; / RTI >
- the vector of reference signals can be precoded as:
- the precoding matrix W may be the same as the precoding matrix used for the PUSCH in the same subframe.
- the conventional DM-RS generates base sequence generation, group hopping, and sequence hopping based on physical cell IDs.
- the DM-RS generated through the above process is mapped to physical resources and then transmitted.
- the structure of the subframe in FIG. 8- (a) shows the case of a normal CP.
- the subframe includes a first slot and a second slot. Each of the first slot and the second slot includes 7 SC-FDMA symbols.
- the 14 SC-FDMA symbols in the subframe are indexed from 0 to 13 symbols.
- a reference signal can be transmitted through an SC-FDMA symbol having symbol indices 3 and 10.
- the reference signal may be transmitted using a sequence.
- a ZC (Zadoff-Chu) sequence may be used as the reference signal sequence, and various ZC sequences may be generated according to the root index and the cyclic shift value.
- the base station can estimate a plurality of terminal channels through an orthogonal sequence or a quasi-orthogonal sequence by assigning different cyclic shift values to the terminal.
- the positions of the frequency regions occupied by the reference signals in the two slots in the subframe may be the same or different.
- the same reference signal sequence is used in the two slots.
- Data can be transmitted through the remaining SC-FDMA symbols except for the SC-FDMA symbol to which the reference signal is transmitted.
- the structure of the subframe in FIG. 8- (b) indicates the case of the extended CP.
- the subframe includes a first slot and a second slot. Each of the first slot and the second slot includes 6 SC-FDMA symbols.
- the 12 SC-FDMA symbols in the subframe are indexed from 0 to 11 symbols.
- a reference signal is transmitted through an SC-FDMA symbol having a symbol index of 2 and 8. Data is transmitted through the remaining SC-FDMA symbols except for the SC-FDMA symbol to which the reference signal is transmitted.
- the conventional method allocates the same frequency band to multiple terminals as PUSCH resources. Then, when generating the DM-RS sequence, each terminal applies a different cyclic shift value? And applies an orthogonal code cover (OCC) value. By this method, the most orthogonal DM-RS sequence is transmitted between terminals.
- OCC orthogonal code cover
- the number of terminals may be large, the quality of an uplink channel may be different between the terminals, and the amount of uplink signal transmission may be different. Therefore, it may be required to assign a PUSCH resource having a different number of resource blocks to each terminal.
- a PUSCH resource having a different number of resource blocks may be allocated to each UE, and overlapping (overlapping) regions may exist between the allocated PUSCH resources. That is, it can be scheduled to perform MU-MIMO transmission only in a part of the PUSCH areas allocated to each mobile station.
- orthogonality between the sequences constituting the DM-RS is severely damaged if the UEs allocated with the redundant PUSCH resources generate the DM-RS by the conventional method.
- FIG. 9 shows a DM-RS transmission method according to an embodiment of the present invention. It is assumed that the terminals # 1 and # 2 are terminals operating in the MU-MIMO.
- the base station or the node transmits a physical cell ID to the terminals # 1 and # 2 through a synchronization signal (S101).
- the base station or the node transmits a parameter for the virtual cell ID # 1 to the terminal # 1 through the upper layer signal (S102).
- the base station or the node transmits a parameter for the virtual cell ID # 2 through the upper layer signal (S103).
- the virtual cell ID is a virtual cell ID provided for each terminal, and is a cell ID different from the physical cell ID.
- the virtual cell ID may be used by the UE to generate the uplink DM-RS.
- the parameters for the virtual cell ID may be given in plural, for example, N (1) ID and N (2) ID used for generating the physical cell ID.
- the parameters for the virtual cell ID may be included in the physical layer control information, i.e., the DCI.
- the Node B or the Node B transmits the first UL scheduling information to the UE # 1 (S104).
- the Node B or the Node B transmits the second uplink scheduling information to the UE # 2 (S105).
- the first uplink scheduling information and the second uplink scheduling information may be configured such that a PUSCH having a different number of resource blocks is scheduled for the terminals # 1 and # 2, but some resource blocks overlap.
- the terminal # 1 transmits the uplink signal using the physical cell ID, and transmits the DM-RS using the virtual cell ID # 1 (S106).
- the uplink signal using the physical cell ID may be SRS, for example.
- the terminal # 2 transmits the uplink signal using the physical cell ID, and transmits the DM-RS using the virtual cell ID # 2 (S107).
- each terminal generates and transmits a part of uplink signals using the same physical cell ID, and can generate and transmit DM-RS using different virtual cell IDs. That is, in order to generate the DM-RS, the UE uses the virtual cell ID instead of the N cell ID , which is the physical cell ID, in some or all of Equations 2 to 13 above. In other words, terminals in the same cell generate DM-RS sequences using different virtual cell IDs. In this case, the UEs # 1 and # 2 are different in the number of resource blocks allocated to the PUSCH, and the DM-RS can be transmitted only in the allocated PUSCH region. Thus, complete orthogonality between the DM-RS sequences is not maintained.
- the DM-RS sequences generated by the UEs having different allocated resource block IDs using the same physical cell ID are provided with better performance than when the DM-RS sequences are classified by cyclic shift or OCC, and then transmitted.
- the process of generating the DM-RS using the parameters for the virtual cell ID will be described in more detail.
- the virtual cell ID may replace the physical cell ID in some or all of the base sequence generation, group hopping and sequence hopping processes of the DM-RS described in Equations 2 to 13.
- a sequence used as a DM-RS is generated by cyclically shifting a base sequence selected from a sequence group of a plurality of sequence groups. Each of the plurality of sequence groups includes at least one base sequence.
- the DM-RS is transmitted in at least two slots in a frame including a plurality of slots in the time domain.
- one sequence group is selected for each slot in the slots through which the DM-RS is transmitted. This process is called group hopping.
- one basic sequence is selected in the selected one sequence group, and this process is called sequence hopping.
- the parameter for the virtual cell ID may be composed of a plurality of parameters.
- the parameter for the proposed virtual cell ID includes a plurality of cell IDs or a plurality of parameters can do.
- the parameter for the proposed virtual cell ID includes not only a virtual cell ID having an integer value of 0 to 503, same as the physical cell ID, but also a virtual cell ID having an integer value of 0 to 503, Parameter.
- the parameters for the virtual cell ID may include not only the virtual cell ID, but also some of the three c init values and f ss values.
- the three c init values may be included independently of the parameters for the virtual cell ID since the generation expressions are different from each other.
- the virtual cell ID to replace the physical cell ID and the c-ID which is determined by the physical cell ID in the DM-RS sequence generation process, It can be configured to include an init value to replace the init value.
- the proposed virtual cell ID may be used to generate at least one of the PUSCH DM-RS and the PUCCH DM-RS, and the virtual cell ID used for generating each DM-RS may be different.
- the BS includes information indicating whether the UE generates the DM-RS using the physical cell ID or the DM-RS using the parameters for the virtual cell ID in an upper layer signal or DCI such as an RRC message .
- each terminal performing MU-MIMO transmits an DM-RS using a virtual cell ID, but this is not a limitation. That is, each terminal can transmit another uplink signal in addition to the DM-RS among the uplink signals using the virtual cell ID.
- FIG. 10 shows a configuration of a base station and a terminal according to an embodiment of the present invention.
- the base station 100 is an example of a node.
- the base station 100 includes a processor 110, a memory 120, and a radio frequency (RF) unit 130.
- the processor 110 implements the proposed functions, processes and / or methods.
- the processor 110 transmits a parameter for a virtual cell ID to a mobile station via an upper layer signal or a physical layer signal, and transmits scheduling information.
- the scheduling information may be scheduled to perform MU-MIMO in some of the PUSCH radio resources allocated to a plurality of terminals.
- the processor 110 informs the physical cell ID via the synchronization signal.
- the memory 120 is connected to the processor 110 and stores various information for driving the processor 110.
- the RF unit 130 is connected to the processor 110 to transmit and / or receive a radio signal.
- the terminal 200 includes a processor 210, a memory 220, and an RF unit 230.
- Processor 210 implements the proposed functionality, process and / or method.
- the processor 210 receives a physical cell ID from a base station via a synchronization signal, and receives a parameter for a virtual cell ID via an upper layer signal or a physical layer signal.
- the parameters for the virtual cell ID are used to generate the virtual cell ID, and the virtual cell ID can be used to generate the uplink DM-RS sequence. That is, the processor 210 may generate some uplink signals using physical cell IDs and the remaining uplink signals using virtual cell IDs.
- the physical cell ID may be cell specific (i.e., cell specific), and the virtual cell ID may be node specific (i.e., other nodes in the same cell may have different virtual cell IDs).
- the memory 220 is connected to the processor 210 and stores various information for driving the processor 210.
- the RF unit 230 is connected to the processor 210 to transmit and / or receive a radio signal.
- the processors 110 and 210 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for converting baseband signals and radio signals.
- the memory 120, 220 may comprise a read-only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium, and /
- the RF units 130 and 230 may include one or more antennas for transmitting and / or receiving wireless signals.
- the above-described techniques may be implemented with modules (processes, functions, and so on) that perform the functions described above.
- the modules may be stored in memory 120, 220 and executed by processors 110, 210.
- the memories 120 and 220 may be internal or external to the processors 110 and 210 and may be coupled to the processors 110 and 210 in a variety of well known ways.
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Abstract
Description
Claims (15)
- 다중 노드 시스템에서 단말의 상향링크 기준 신호 전송 방법에 있어서,
노드로부터 동기화 신호를 수신하는 단계;
상기 노드로부터 가상 셀 ID(identifier)에 대한 파라미터를 수신하는 단계;
상기 가상 셀 ID에 대한 파라미터를 이용하여 상향링크 복조 기준 신호(demodulation reference signal : DM-RS)를 생성하는 단계; 및
상기 생성된 상향링크 DM-RS를 상기 노드로 전송하는 단계를 포함하되,
물리적 셀 ID는 상기 동기화 신호로부터 수신되는 셀 ID 이고,
상기 가상 셀 ID에 대한 파라미터는 상기 물리적 셀 ID를 대체하여 상기 상향링크 DM-RS를 생성하는데 사용되는 파라미터인 것을 특징으로 하는 방법. - 제 1 항에 있어서, 상기 가상 셀 ID에 대한 파라미터는 단말마다 다르게 주어지는 단말 특정적 파라미터인 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 상향링크 DM-RS는
복수의 시퀀스 그룹들 중 하나의 시퀀스 그룹에서 선택된 기본 시퀀스를 순환 쉬프트시켜 생성되며, 상기 복수의 시퀀스 그룹들 각각은 적어도 하나의 기본 시퀀스를 포함하는 것을 특징으로 하는 방법. - 제 3 항에 있어서, 상기 순환 쉬프트는 상기 가상 셀 ID에 대한 파라미터를 기반으로 결정되는 것을 특징으로 하는 방법.
- 제 3 항에 있어서, 상기 상향링크 DM-RS는
시간 영역에서 복수의 슬롯을 포함하는 프레임에서 적어도 2개의 슬롯에서 전송되며
상기 적어도 2개의 슬롯에서 각 슬롯마다 하나의 시퀀스 그룹이 선택되고, 상기 선택된 하나의 시퀀스 그룹 내에서 선택된 하나의 기본 시퀀스를 순환 쉬프트시켜 생성되는 것을 특징으로 하는 방법. - 제 5 항에 있어서, 상기 각 슬롯마다 선택되는 하나의 시퀀스 그룹은 상기 가상 셀 ID에 대한 파라미터를 기반으로 결정되는 것을 특징으로 하는 방법.
- 제 6 항에 있어서, 상기 각 슬롯마다 결정된 하나의 시퀀스 그룹 내에서 선택되는 기본 시퀀스는 상기 가상 셀 ID에 대한 파라미터를 기반으로 결정되는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 가상 셀 ID에 대한 파라미터는 0 에서 513까지의 정수값 중 어느 하나를 갖는 가상 셀 ID를 포함하고,
상기 가상 셀 ID는 상기 물리적 셀 ID를 대체하여 상기 상향링크 DM-RS를 생성하는데 사용되는 것을 특징으로 하는 방법. - 제 1 항에 있어서, 상기 물리적 셀 ID는 상기 DM-RS를 제외한 나머지 상향링크 신호 생성에 사용되는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 가상 셀 ID에 대한 파라미터는
RRC(radio resource control)메시지를 통해 전송되는 것을 특징으로 하는 방법. - 제 1 항에 있어서,
상기 노드로부터 상향링크 스케줄링 정보를 수신하는 단계를 더 포함하되,
상기 가상 셀 ID에 대한 파라미터는 상기 상향링크 스케줄링 정보에 포함되는 파라미터를 기반으로 생성되는 것을 특징으로 하는 방법. - 제 11 항에 있어서, 상기 상향링크 스케줄링 정보는 상기 단말이 상향링크 데이터 채널을 전송하는 주파수 대역을 지시하는 정보를 포함하되,
상기 주파수 대역은 상기 단말과 동시에 상향링크 데이터 채널 및 DM-RS을 전송하는 다른 단말의 주파수 대역과 겹치는 대역을 포함하는 것을 특징으로 하는 방법. - 제 1 항에 있어서, 상기 DM-RS는
14개의 SC-FDMA(single carrier-frequency division multiple access) 심벌을 포함하는 상향링크 서브프레임에서 4번째 및 11번째 SC-FDMA 심벌에서 전송되는 것을 특징으로 하는 방법. - 제 1 항에 있어서, 상기 DM-RS는
12개의 SC-FDMA(single carrier-frequency division multiple access) 심벌을 포함하는 상향링크 서브프레임에서 3번째 및 9번째 SC-FDMA 심벌에서 전송되는 것을 특징으로 하는 방법. - 다중 노드 시스템에서 상향링크 복조 기준 신호를 전송하는 단말에 있어서,
무선 신호를 송신 및 수신하는 RF(radio freqeuncy)부; 및
상기 RF부와 연결되는 프로세서를 포함하되, 상기 프로세서는
노드로부터 동기화 신호를 수신하고, 상기 노드로부터 가상 셀 ID(identifier)에 대한 파라미터를 수신하고, 상기 가상 셀 ID에 대한 파라미터를 이용하여 상향링크 복조 기준 신호(demodulation reference signal : DM-RS)를 생성하고, 상기 생성된 상향링크 DM-RS를 상기 노드로 전송하되,
물리적 셀 ID는 상기 동기화 신호로부터 수신되는 셀 ID 이고,
상기 가상 셀 ID에 대한 파라미터는 상기 물리적 셀 ID를 대체하여 상기
상향링크 DM-RS를 생성하는데 사용되는 파라미터인 것을 특징으로 하는 단말.
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EP12818170.8A EP2738991B1 (en) | 2011-07-27 | 2012-07-27 | Method for transmitting an uplink reference signal in a multi-node system and terminal using same |
CN201280036811.6A CN103703734B (zh) | 2011-07-27 | 2012-07-27 | 在多节点系统中发送上行链路参考信号的方法和使用该方法的终端 |
AU2012287626A AU2012287626B2 (en) | 2011-07-27 | 2012-07-27 | Method for transmitting an uplink reference signal in a multi-node system and terminal using same |
US14/234,963 US9350397B2 (en) | 2011-07-27 | 2012-07-27 | Method for transmitting an uplink reference signal in a multi-node system and terminal using same |
JP2014522757A JP5726380B2 (ja) | 2011-07-27 | 2012-07-27 | 多重ノードシステムにおけるアップリンク基準信号送信方法及びその方法を利用する端末 |
KR1020147004955A KR101427072B1 (ko) | 2011-07-27 | 2012-07-27 | 다중 노드 시스템에서 상향링크 기준 신호 전송 방법 및 그 방법을 이용하는 단말 |
MX2014000958A MX2014000958A (es) | 2011-07-27 | 2012-07-27 | Metodo para transmitir una señal de referencia de enlace ascendente en un sistema multi - nodo y terminal que utiliza el mismo. |
US15/145,588 US9794918B2 (en) | 2011-07-27 | 2016-05-03 | Method for transmitting demodulation reference signals in wireless communication system and terminal using same |
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US15/145,588 Continuation US9794918B2 (en) | 2011-07-27 | 2016-05-03 | Method for transmitting demodulation reference signals in wireless communication system and terminal using same |
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EP2738991A4 (en) | 2015-04-22 |
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US20160249348A1 (en) | 2016-08-25 |
AU2012287626B2 (en) | 2015-07-23 |
KR101427072B1 (ko) | 2014-08-05 |
US9794918B2 (en) | 2017-10-17 |
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US20140348063A1 (en) | 2014-11-27 |
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AU2012287626A1 (en) | 2014-02-20 |
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