WO2018088795A1 - 동기화 신호 전송 방법 및 이를 위한 장치 - Google Patents
동기화 신호 전송 방법 및 이를 위한 장치 Download PDFInfo
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- WO2018088795A1 WO2018088795A1 PCT/KR2017/012594 KR2017012594W WO2018088795A1 WO 2018088795 A1 WO2018088795 A1 WO 2018088795A1 KR 2017012594 W KR2017012594 W KR 2017012594W WO 2018088795 A1 WO2018088795 A1 WO 2018088795A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0073—Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0076—Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group
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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
- H04L5/0058—Allocation criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2211/00—Orthogonal indexing scheme relating to orthogonal multiplex systems
- H04J2211/003—Orthogonal indexing scheme relating to orthogonal multiplex systems within particular systems or standards
- H04J2211/005—Long term evolution [LTE]
Definitions
- the present invention relates to a method and apparatus for transmitting a synchronization signal in a wireless communication system, and more particularly, to a synchronization signal including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH).
- PSS primary synchronization signal
- SSS secondary synchronization signal
- PBCH physical broadcast channel
- a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (LTE)) communication system will be described.
- E-UMTS Evolved Universal Mobile Telecommunications System
- UMTS Universal Mobile Telecommunications System
- LTE Long Term Evolution
- an E-UMTS is an access gateway (AG) located at an end of a user equipment (UE) and a base station (eNode B), an eNB, and a network (E-UTRAN) and connected to an external network.
- the base station may transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.
- the cell is set to one of bandwidths such as 1.25, 2.5, 5, 10, 15, and 20 MHz to provide 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 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 uplink UL data for uplink (UL) data and informs the corresponding time / frequency domain, encoding, data size, HARQ related information, and the like.
- the core network may be composed of an AG and a network node for user registration of the terminal.
- the AG manages the mobility of the UE in units of a tracking area (TA) composed of a plurality of cells.
- Wireless communication technology has been developed to LTE based on WCDMA, but the demands and expectations of users and operators are continuously increasing.
- new technological evolution is required to be competitive in the future. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interface, and adequate power consumption of the terminal are required.
- the present invention provides a method and apparatus for transmitting a synchronization signal in a wireless communication system.
- a method of transmitting a synchronization signal by a base station comprising: mapping a plurality of synchronization signal blocks to a plurality of symbols within a specific time unit;
- the method may include transmitting a plurality of synchronization signal blocks mapped to the plurality of symbols to a terminal, wherein at least one synchronization signal block may be mapped to each half time unit having a length of half of the specific time unit.
- the synchronization signal block may be mapped so as not to cross the boundary between the half time units within the specific time unit.
- the plurality of synchronization signal blocks may not be mapped to at least two symbols positioned among the plurality of symbols.
- the plurality of synchronization signal blocks may not be mapped to at least two last symbols among the plurality of symbols.
- each of the plurality of synchronization signal blocks may be mapped to four consecutive symbols.
- the arrangement of the plurality of synchronization signal blocks may be determined by the specific time unit period, and the same arrangement pattern may be repeatedly applied to every specific time unit.
- the specific time unit is divided into 14 * n symbols, where n is an integer and may be determined according to a subcarrier spacing.
- a base station for transmitting a synchronization signal block
- RF base station for transmitting and receiving radio signals with a terminal
- the processor may include at least one synchronization signal block mapped to each half time unit having a half length.
- the synchronization signal block may be mapped so as not to cross the boundary between the half time units within the specific time unit.
- the plurality of synchronization signal blocks may be mapped to at least two of the symbols located among the plurality of symbols.
- the plurality of synchronization signal blocks may not be mapped to at least two last symbols among the plurality of symbols.
- each of the plurality of synchronization signal blocks may be mapped to four consecutive symbols.
- the arrangement of the plurality of synchronization signal blocks may be determined by the specific time unit period, and the same arrangement pattern may be repeatedly applied to every specific time unit.
- the specific time unit is divided into 14 * n symbols, where n is an integer and may be determined according to a subcarrier spacing.
- FIG. 1 schematically illustrates an E-UMTS network structure as an example of a wireless communication system.
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
- FIG. 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.
- 3 is a diagram for explaining a physical channel used in the 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 illustrates a radio frame structure for transmission of a synchronization signal (SS) used in an LTE system.
- SS synchronization signal
- FIG. 6 is a diagram illustrating a structure of a downlink radio frame used in the LTE system.
- FIG. 7 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
- FIG 8 shows examples of a connection scheme of a TXRU and an antenna element.
- FIG. 10 is a diagram illustrating a configuration of a synchronization signal block according to an embodiment of the present invention.
- FIG. 11 is a diagram illustrating a configuration of a synchronization signal burst according to an embodiment of the present invention.
- 12 to 13 are diagrams illustrating an embodiment of synchronization signal arrangement in a subframe.
- FIG. 14 is a diagram for explaining the configuration of a synchronization signal burst set.
- FIG. 15 illustrates a block diagram of a communication device according to an embodiment of the present invention.
- the specification of the base station may be used as a generic term including a remote radio head (RRH), an eNB, a transmission point (TP), a reception point (RP), a relay, and the like.
- RRH remote radio head
- TP transmission point
- RP reception point
- relay and the like.
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
- the control plane refers to a path through which control messages used by a user equipment (UE) and a network to manage a call are transmitted.
- the user plane refers to a path through which data generated at an application layer, for example, voice data or Internet packet data, is transmitted.
- the physical layer which is the first layer, provides an information transfer service to an upper layer by using a physical channel.
- the physical layer is connected to the upper layer of the medium access control layer through a transport channel. Data moves between the medium access control layer and the physical layer through the transmission 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.
- the physical channel is modulated in an Orthogonal Frequency Division Multiple Access (OFDMA) scheme in downlink, and modulated in a Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme in uplink.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the medium access control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
- RLC radio link control
- the RLC layer of the second layer supports reliable data transmission.
- the function of the RLC layer may be implemented as a functional block inside the MAC.
- the 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.
- the RRC layer is responsible for controlling logical channels, transmission channels, and physical channels in connection with configuration, reconfiguration, and release of radio bearers.
- the radio bearer refers to a service provided by the second layer for data transmission between the terminal and the network.
- the RRC layers of the UE and the network exchange RRC messages with each other. If there is an RRC connected (RRC Connected) between the UE and the RRC layer of the network, the UE is in an RRC connected mode, otherwise it is in an RRC idle mode.
- the non-access stratum (NAS) layer above the RRC layer performs functions such as session management and mobility management.
- the downlink transmission channel for transmitting data from the network to the UE includes a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting a paging message, and a downlink shared channel (SCH) for transmitting user traffic or a control message.
- BCH broadcast channel
- PCH paging channel
- SCH downlink shared channel
- Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
- the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or a control message.
- RAC random access channel
- SCH uplink shared channel
- the logical channel mapped to the transmission channel includes a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and an MTCH (multicast). Traffic Channel).
- BCCH broadcast control channel
- PCCH paging control channel
- CCCH common control channel
- MCCH multicast control channel
- MTCH multicast. Traffic Channel
- FIG. 3 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same.
- the UE When the UE is powered on or enters a new cell, the UE performs an initial cell search operation such as synchronizing with the base station (S301). To this end, the terminal may receive a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station to synchronize with the base station and obtain information such as a cell ID. have. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.
- P-SCH Primary Synchronization Channel
- S-SCH Secondary Synchronization Channel
- DL RS downlink reference signal
- the UE Upon completion of the initial cell search, the UE acquires more specific system information by receiving a physical downlink control channel (PDSCH) according to a physical downlink control channel (PDCCH) and information on the PDCCH. It may be (S302).
- PDSCH physical downlink control channel
- PDCCH physical downlink control channel
- the terminal may perform a random access procedure (RACH) for the base station (steps S303 to S306).
- RACH random access procedure
- the UE may transmit a specific sequence as a preamble through a physical random access channel (PRACH) (S303 and S305), and receive a response message for the preamble through the PDCCH and the corresponding PDSCH ( S304 and S306).
- PRACH physical random access channel
- a contention resolution procedure may be additionally performed.
- the UE After performing the procedure as described above, the UE performs a PDCCH / PDSCH reception (S307) and a physical uplink shared channel (PUSCH) / physical uplink control channel (Physical Uplink) as a general uplink / downlink signal transmission procedure.
- Control Channel (PUCCH) transmission (S308) may be performed.
- the terminal receives downlink control information (DCI) through the PDCCH.
- DCI downlink control information
- the DCI includes control information such as resource allocation information for the terminal, and the format is different according to the purpose of use.
- the control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), and a rank indicator (RI). ), And the like.
- the terminal may transmit the above-described control information such as CQI / PMI / RI through the PUSCH and / or PUCCH.
- FIG. 4 is a diagram illustrating a structure of a radio frame used in an LTE system.
- a radio frame has a length of 10 ms (327200 ⁇ T 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 OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
- one resource block includes 12 subcarriers x 7 (6) OFDM symbols.
- Transmission Time Interval which is a unit time at which data is transmitted, may be determined in units of one or more subframes.
- the structure of the radio frame described above is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of OFDM symbols included in the slot may be variously changed.
- FIG. 5 illustrates a radio frame structure for transmission of a synchronization signal (SS) in an LTE / LTE-A based wireless communication system.
- FIG. 3 illustrates a radio frame structure for transmission of a synchronization signal and a PBCH in a frequency division duplex (FDD), and
- FIG. 5 (a) is configured as a normal cyclic prefix (CP).
- 5 shows a transmission position of the SS and PBCH in a radio frame
- FIG. 5 (b) shows a transmission position of the SS and PBCH in a radio frame set as an extended CP.
- PSS is used to obtain time domain synchronization and / or frequency domain synchronization such as OFDM symbol synchronization, slot synchronization, etc.
- SSS is used for frame synchronization, cell group ID and / or cell CP configuration (i.e., general CP or extension). It is used to get usage information of CP).
- PSS and SSS are transmitted in two OFDM symbols of every radio frame, respectively.
- the SS may be configured in the first slot of subframe 0 and the first slot of subframe 5 in consideration of 4.6 ms, which is a Global System for Mobile Communication (GSM) frame length.
- GSM Global System for Mobile Communication
- the PSS is transmitted in the last OFDM symbol of the first slot of subframe 0 and the last OFDM symbol of the first slot of subframe 5, respectively, and the SSS is the second to second OFDM symbols and subframe of the first slot of subframe 0, respectively.
- the boundary of the radio frame can be detected through the SSS.
- the PSS is transmitted in the last OFDM symbol of the slot and the SSS is transmitted in the OFDM symbol immediately before the PSS.
- the transmission diversity scheme of the SS uses only a single antenna port and is not defined in the standard.
- the UE Since the PSS is transmitted every 5 ms, the UE detects the PSS to know that the corresponding subframe is one of the subframe 0 and the subframe 5, but the subframe may not know what the subframe 0 and the subframe 5 specifically. . Therefore, the UE does not recognize the boundary of the radio frame only by the PSS. That is, frame synchronization cannot be obtained only by PSS.
- the UE detects the boundary of the radio frame by detecting the SSS transmitted twice in one radio frame but transmitted as different sequences.
- the UE that performs a cell discovery process using PSS / SSS and determines a time and frequency parameter required to perform demodulation of DL signals and transmission of UL signals at an accurate time point is further determined from the eNB.
- system information required for system configuration of the system must be obtained.
- System information is configured by a Master Information Block (MIB) and System Information Blocks (SIBs).
- MIB Master Information Block
- SIBs System Information Blocks
- Each system information block includes a collection of functionally related parameters, and includes a master information block (MIB), a system information block type 1 (SIB1), and a system information block type according to the included parameters.
- MIB Master Information Block
- SIB1 system information block type 1
- SIB3 System Information Block Type 2
- the MIB contains the most frequently transmitted parameters that are necessary for the UE to have initial access to the eNB's network.
- the UE may receive the MIB via a broadcast channel (eg, PBCH).
- PBCH broadcast channel
- the MIB includes a downlink system bandwidth (dl-Bandwidth, DL BW), a PHICH configuration, and a system frame number (SFN). Therefore, the UE can know the information on the DL BW, SFN, PHICH configuration explicitly by receiving the PBCH.
- the information that the UE implicitly (implicit) through the reception of the PBCH includes the number of transmit antenna ports of the eNB.
- Information about the number of transmit antennas of the eNB is implicitly signaled by masking (eg, XOR operation) a sequence corresponding to the number of transmit antennas to a 16-bit cyclic redundancy check (CRC) used for error detection of the PBCH.
- masking eg, XOR operation
- CRC cyclic redundancy check
- SIB1 includes not only information on time domain scheduling of other SIBs, but also parameters necessary for determining whether a specific cell is a cell suitable for cell selection. SIB1 is received by the UE through broadcast signaling or dedicated signaling.
- the DL carrier frequency and the corresponding system bandwidth can be obtained by the MIB carried by the PBCH.
- the UL carrier frequency and corresponding system bandwidth can be obtained through system information that is a DL signal.
- the UE applies the value of the DL BW in the MIB to the UL-bandwidth (UL BW) until a system information block type 2 (SystemInformationBlockType2, SIB2) is received.
- the UE may acquire a system information block type 2 (SystemInformationBlockType2, SIB2) to determine the entire UL system band that can be used for UL transmission through UL-carrier frequency and UL-bandwidth information in the SIB2. .
- PSS / SSS and PBCH are transmitted only within a total of six RBs, that is, a total of 72 subcarriers, three on the left and right around a DC subcarrier within a corresponding OFDM symbol, regardless of the actual system bandwidth. Therefore, the UE is configured to detect or decode the SS and the PBCH regardless of the downlink transmission bandwidth configured for the UE.
- the UE may perform a random access procedure to complete the access to the eNB. To this end, the UE may transmit a preamble through a physical random access channel (PRACH) and receive a response message for the preamble through a PDCCH and a PDSCH.
- PRACH physical random access channel
- additional PRACH transmission and contention resolution procedure such as PDCCH and PDSCH corresponding to the PDCCH may be performed.
- the UE may perform PDCCH / PDSCH reception and PUSCH / PUCCH transmission as a general uplink / downlink signal transmission procedure.
- the random access process is also referred to as a random access channel (RACH) process.
- the random access procedure is used for various purposes, such as initial access, random access procedure, initial access, uplink synchronization coordination, resource allocation, handover, and the like.
- the random access process is classified into a contention-based process and a dedicated (ie non-competition-based) process.
- the contention-based random access procedure is generally used, including initial access, and the dedicated random access procedure is limited to handover and the like.
- the UE randomly selects a RACH preamble sequence. Therefore, it is possible for a plurality of UEs to transmit the same RACH preamble sequence at the same time, which requires a contention cancellation process later.
- the dedicated random access process the UE uses the RACH preamble sequence that is allocated only to the UE by the eNB. Therefore, the random access procedure can be performed without collision with another UE.
- the contention-based random access procedure includes four steps.
- the messages transmitted in steps 1 to 4 may be referred to as messages 1 to 4 (Msg1 to Msg4), respectively.
- Step 1 RACH preamble (via PRACH) (UE to eNB)
- Step 2 random access response (RAR) (via PDCCH and PDSCH) (eNB to UE)
- Step 3 Layer 2 / Layer 3 message (via PUSCH) (UE to eNB)
- Step 4 Contention Resolution Message (eNB to UE)
- the dedicated random access procedure includes three steps.
- the messages transmitted in steps 0 to 2 may be referred to as messages 0 to 2 (Msg0 to Msg2), respectively.
- uplink transmission ie, step 3) corresponding to the RAR may also be performed.
- the dedicated random access procedure may be triggered using a PDCCH (hereinafter, referred to as a PDCCH order) for the purpose of instructing the base station to transmit the RACH preamble.
- Step 0 RACH preamble allocation via dedicated signaling (eNB to UE)
- Step 1 RACH preamble (via PRACH) (UE to eNB)
- Step 2 Random Access Response (RAR) (via PDCCH and PDSCH) (eNB to UE)
- RAR Random Access Response
- the UE After transmitting the RACH preamble, the UE attempts to receive a random access response (RAR) within a pre-set time window. Specifically, the UE attempts to detect a PDCCH (hereinafter, RA-RNTI PDCCH) having a random access RNTI (RA-RNTI) (eg, CRC in the PDCCH is masked to RA-RNTI) within a time window. Upon detecting the RA-RNTI PDCCH, the UE checks whether there is a RAR for itself in the PDSCH corresponding to the RA-RNTI PDCCH.
- RA-RNTI PDCCH a PDCCH having a random access RNTI (RA-RNTI) (eg, CRC in the PDCCH is masked to RA-RNTI)
- RA-RNTI PDCCH a random access RNTI
- the RAR includes timing advance (TA) information indicating timing offset information for UL synchronization, UL resource allocation information (UL grant information), a temporary terminal identifier (eg, temporary cell-RNTI, TC-RNTI), and the like. .
- the UE may perform UL transmission (eg, Msg3) according to the resource allocation information and the TA value in the RAR.
- HARQ is applied to UL transmission corresponding to the RAR. Therefore, after transmitting the Msg3, the UE may receive reception response information (eg, PHICH) corresponding to the Msg3.
- the random access preamble ie, the RACH preamble
- the RACH preamble consists of a cyclic prefix of length T CP and a sequence portion of length T SEQ in the physical layer.
- the T SEQ of the T CP depends on the frame structure and the random access configuration.
- the preamble format is controlled by higher layers.
- the PACH preamble is transmitted in a UL subframe. Transmission of the random access preamble is restricted to certain time and frequency resources. These resources are referred to as PRACH resources, and the PRACH resources are numbered in order of subframe number in the radio frame, followed by increasing PRBs in the frequency domain, so that index 0 corresponds to the lower number PRB and subframe in the radio frame. Lose. Random access resources are defined according to the PRACH configuration index (see 3GPP TS 36.211 standard document). The PRACH configuration index is given by the higher layer signal (sent by the eNB).
- the subcarrier spacing for the random access preamble is defined as 1.25 kHz for the preamble formats 0 to 3 and 7.5 kHz for the preamble format 4 (see 3GPP TS 36.211).
- FIG. 6 is a diagram illustrating a control channel included in a control region of one subframe in a downlink radio frame.
- a subframe consists of 14 OFDM symbols.
- the first 1 to 3 OFDM symbols are used as the control region and the remaining 13 to 11 OFDM symbols are used as the data region.
- R1 to R4 represent reference signals (RSs) or pilot signals for antennas 0 to 3.
- the RS is fixed in a constant pattern in a subframe regardless of the control region and the data region.
- the control channel is allocated to a resource to which no RS is allocated in the control region, and the traffic channel is also allocated to a resource to which no RS is allocated in the data region.
- Control channels allocated to the control region include PCFICH (Physical Control Format Indicator CHannel), PHICH (Physical Hybrid-ARQ Indicator CHannel), PDCCH (Physical Downlink Control CHannel).
- the PCFICH is a physical control format indicator channel and informs the UE of the number of OFDM symbols used for the PDCCH in every subframe.
- the PCFICH is located in the first OFDM symbol and is set in preference to the PHICH and PDCCH.
- the PCFICH is composed of four Resource Element Groups (REGs), and each REG is distributed in a control region based on a Cell ID (Cell IDentity).
- One REG is composed of four resource elements (REs).
- the RE represents a minimum physical resource defined by one subcarrier x one OFDM symbol.
- the PCFICH value indicates a value of 1 to 3 or 2 to 4 depending on the bandwidth and is modulated by Quadrature Phase Shift Keying (QPSK).
- QPSK Quadrature Phase Shift Keying
- the PHICH is a physical hybrid automatic repeat and request (HARQ) indicator channel and is used to carry HARQ ACK / NACK for uplink transmission. That is, the PHICH indicates a channel through which DL ACK / NACK information for UL HARQ is transmitted.
- the PHICH consists of one REG and is scrambled cell-specifically.
- ACK / NACK is indicated by 1 bit and modulated by binary phase shift keying (BPSK).
- BPSK binary phase shift keying
- a plurality of PHICHs mapped to the same resource constitutes a PHICH group.
- the number of PHICHs multiplexed into the PHICH group is determined according to the number of spreading codes.
- the PHICH (group) is repeated three times to obtain diversity gain in the frequency domain and / or the time domain.
- the PDCCH is a physical downlink control channel and is allocated to the first n OFDM symbols of a subframe.
- n is indicated by the PCFICH as an integer of 1 or more.
- the PDCCH consists of one or more CCEs.
- the PDCCH informs each UE or UE group of information related to resource allocation of a paging channel (PCH) and a downlink-shared channel (DL-SCH), an uplink scheduling grant, and HARQ information.
- PCH paging channel
- DL-SCH downlink-shared channel
- Paging channel (PCH) and downlink-shared channel (DL-SCH) are transmitted on the PDSCH. Accordingly, the base station and the terminal generally transmit and receive data through the PDSCH except for specific control information or specific service data.
- Data of the PDSCH is transmitted to which UE (one or a plurality of UEs), and information on how the UEs should receive and decode PDSCH data is included in the PDCCH and transmitted.
- a specific PDCCH is CRC masked with a Radio Network Temporary Identity (RNTI) of "A”, a radio resource (eg, frequency location) of "B” and a DCI format of "C", that is, a transmission format.
- RTI Radio Network Temporary Identity
- the terminal in the cell monitors, that is, blindly decodes, the PDCCH in the search region by using the RNTI information of the cell, and if there is at least one terminal having an "A" RNTI, the terminals receive and receive the PDCCH.
- the PDSCH indicated by "B” and "C” is received through the information of one PDCCH.
- FIG. 7 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 Physical Uplink Shared CHannel (PUSCH) 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.
- the control information transmitted on the PUCCH includes ACK / NACK used for HARQ, Channel Quality Indicator (CQI) indicating a downlink channel state, RI (Rank Indicator) for MIMO, and scheduling request (SR), which is an uplink resource allocation request. There is this.
- 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.
- channel state information (CSI) reporting will be described.
- CSI channel state information
- each of the base station and the terminal may perform beamforming based on channel state information in order to obtain a multiplexing gain (multiplexing gain) of the MIMO antenna.
- the base station instructs the terminal to feed back the channel state information (CSI) for the downlink signal by assigning a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) to the terminal.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- CSI is largely classified into three types of information such as rank indicator (RI), precoding matrix index (PMI), and channel quality indication (CQI).
- RI represents rank information of a channel, and means the number of streams that a UE can receive through the same frequency-time resource.
- PMI precoding matrix index
- CQI channel quality indication
- PMI is a value reflecting spatial characteristics of a channel and represents a precoding matrix index of a base station preferred by a terminal based on a metric such as SINR.
- CQI is a value representing the strength of the channel, which means the reception SINR that can be obtained when the base station uses PMI.
- the base station may configure a plurality of CSI processes to the UE, and receive and report the CSI for each CSI process.
- the CSI process is composed of a CSI-RS resource for signal quality specification from a base station and an interference measurement (CSI-IM) resource for interference measurement, that is, an IMR (interference measurement resource).
- CSI-IM interference measurement resource
- the wavelength is shortened, allowing the installation of multiple antenna elements in the same area.
- the wavelength is 1 cm, and a total of 64 (8x8) antenna elements in a 2D (dimension) array form at 0.5 lambda intervals can be installed in a panel of 4 by 4 cm. Therefore, recent trends in the mmW field have attempted to increase the coverage or increase the throughput by increasing the beamforming gain using a plurality of antenna elements.
- TXRU Transceiver Unit
- independent beamforming is possible for each frequency resource.
- TXRU Transceiver Unit
- the analog beamforming method has a disadvantage in that only one beam direction can be made in the entire band and thus frequency selective beamforming cannot be performed.
- a hybrid BF having B TXRUs, which is smaller than Q antenna elements, may be considered as an intermediate form between digital BF and analog BF.
- the beam directions that can be simultaneously transmitted are limited to B or less.
- FIG 8 shows examples of a connection scheme of a TXRU and an antenna element.
- FIG. 8 (a) shows how a TXRU is connected to a sub-array.
- the antenna element is connected to only one TXRU.
- FIG. 7B shows how the TXRU is connected to all antenna elements.
- the antenna element is connected to all TXRUs.
- W denotes a phase vector multiplied by an analog phase shifter. That is, the direction of analog beamforming is determined by W.
- the mapping between the CSI-RS antenna port and the TXRUs may be 1-to-1 or 1-to-multi.
- Massive MTC Machine Type Communications
- NewRAT New Radio Access
- the fifth generation NewRAT considers a self-contained subframe structure as shown in FIG. 9. 9 is an example of a self-contained subframe structure.
- the hatched region represents a downlink control region
- the black portion represents an uplink control region.
- An area without an indication may be used for downlink data transmission or may be used for uplink data transmission.
- the feature of such a structure is that downlink transmission and uplink transmission are sequentially performed in one subframe, thereby transmitting downlink data and receiving uplink ACK / NACK in the subframe. As a result, when a data transmission error occurs, the time taken to retransmit data is reduced, thereby minimizing the latency of the final data transfer.
- a time gap is required for a base station and a UE to switch from a transmission mode to a reception mode or a process of switching from a reception mode to a transmission mode.
- OFDM symbols OFDM symbols; OS
- GP guard period
- subframe type configurable / configurable in a system operating based on NewRAT at least the following four subframe types may be considered.
- a synchronization signal block (SS block), a synchronization signal burst (SS Burst) and a synchronization signal burst set (Synchronization Signal Burst Set; SS Burst set)
- SS block synchronization signal block
- SS Burst synchronization signal burst
- SS burst set Synchronization Signal Burst Set
- NR initial access signal such as NR-SS (NewRAT Synchronization Signal), NR-PBCH (NewRAT Physical Broadcast Channel), control channel and Measurement Reference Signal (MRS), for performing the initial access procedure and The channel is defined.
- NR-SS NewRAT Synchronization Signal
- NR-PBCH NewRAT Physical Broadcast Channel
- MRS Measurement Reference Signal
- various types of synchronization signal blocks may be defined according to types of signals and channels included in one synchronization signal block.
- each type of the synchronization signal block disclosed in Table 1 has the same time duration.
- 10 is a diagram illustrating each type of synchronization signal block having the same time interval as described above. 10 shows the configuration of the PSS, SSS, PBCH, MRS and control channel according to each type of synchronization signal block.
- each type of the synchronization signal block has the same time interval even though the types thereof are different, and as shown in the left figure of FIG. As shown in the right figure of FIG. 10, it may be multiplexed in the frequency domain according to the frequency division multiplexing (FDM) scheme.
- each type of synchronization signal block has the same numerology, within the same time interval.
- the unmapped resource element may be used for data transmission.
- a synchronization signal burst is defined to include one or more synchronization signal blocks.
- one synchronization signal burst is composed of the same type of synchronization signal block. That is, the synchronization signal burst includes one or more synchronization signal blocks, and the one or more synchronization signal blocks included in the synchronization signal burst are all the same type.
- the synchronization signal block included in the synchronization signal burst of FIG. 11 (a) and the synchronization signal block included in the synchronization signal burst of FIG. 11 (b) are different types, but included in the synchronization signal burst of FIG. 11 (a).
- the plurality of synchronized signal blocks are all of the same type.
- the type of synchronization signal burst is determined according to the synchronization signal block included in the synchronization signal burst.
- the synchronization signal blocks included in the synchronization signal burst may be numbered in order.
- the index of the synchronization signal burst may be indicated by the NR-PBCH.
- the downlink control channel and the demodulation reference signal are mapped to one or more OFDM symbols located at the front, and the uplink control channel is mapped to one or more OFDM symbols located at the last.
- the synchronization signal block may be mapped to the middle region of the subframe such that the synchronization signal block deviates from the region where the downlink control channel and the uplink control channel are mapped. That is, the mapping region of the synchronization signal block may be configured to be mapped to the middle region of the subframe such that the mapping region of the synchronization signal block does not overlap with the region where the downlink control channel and the uplink control channel are mapped.
- the synchronization signal block is not mapped between two adjacent slots.
- the NR synchronization signal block is placed within every 0.5 ms in the subframe.
- the synchronization signal block is arranged not to span the boundary between every 0.5ms in the subframe.
- the synchronization signal block is disposed so as not to overlap the 0.5 ms of the front end of the subframe and 0.5 ms of the rear end, that is, the middle line of the subframe.
- the synchronization signal block is disposed in the middle of the subframe, and one synchronization signal block is disposed in one slot having a length of 0.5 ms.
- the synchronization signal block is arranged so as not to span the middle line of the subframe, that is, every 0.5 ms in the subframe.
- the length of the first OFDM symbol included in 0.5 ms is 16 * Ts longer than the length of other OFDM symbols.
- two long CPs are used in an NR subframe of 1 ms. That is, since the length of the first OFDM symbol included in 0.5ms is longer than the length of other OFCM symbols, the first OFDM symbol is a long length of the CP is a synchronization signal block in which the sequence is generated to be mapped to four symbols based on the normal CP Once mapped to a symbol, the mapping and transmission of the synchronization signal block may not be efficient.
- the synchronization signal block is not mapped over a boundary between every 0.5ms in the subframe.
- the rule for placing the synchronization signal block may be applied to all possible subframes according to the subcarrier spacing, as shown in FIG. 13. That is, the NR synchronization signal burst may be defined within 0.5 ms or may be defined within an NR subframe, regardless of subcarrier spacing.
- the synchronization signal block arrangement method according to FIGS. 12 to 13 may have the following rules.
- the synchronization signal block cannot be contiguous within the synchronization signal burst and cannot be contiguous even within multiple slots.
- the period of the NR burst is determined based on the NR subframe, regardless of the subcarrier spacing.
- a synchronization signal burst set is composed of different types of synchronization signal bursts having the same period in the synchronization burst set.
- an aperiodic synchronization burst may occur, wherein the aperiodic synchronization burst may be the same as any one of a plurality of synchronization signal bursts included in the synchronization burst set.
- the periodic synchronization burst may be triggered every corresponding period in the synchronization burst set, and the period may be set by the indicator.
- the communication device 1500 includes a processor 1510, a memory 1520, an RF module 1530, a display module 1540, and a user interface module 1550.
- the communication device 1500 is shown for convenience of description and some modules may be omitted. In addition, the communication device 1500 may further include necessary modules. In addition, some modules in the communication device 1500 may be classified into more granular modules.
- the processor 1510 is configured to perform an operation according to the embodiment of the present invention illustrated with reference to the drawings. In detail, the detailed operation of the processor 1510 may refer to the contents described with reference to FIGS. 1 to 10.
- the memory 1520 is connected to the processor 1510 and stores an operating system, an application, program code, data, and the like.
- the RF module 1530 is connected to the processor 1510 and performs 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 module 1530 performs analog conversion, amplification, filtering and frequency up conversion, or a reverse process thereof.
- the display module 1540 is connected to the processor 1510 and displays various information.
- the display module 1540 may use well-known elements such as, but not limited to, a liquid crystal display (LCD), a light emitting diode (LED), and an organic light emitting diode (OLED).
- the user interface module 1550 is connected to the processor 1510 and may be configured with a combination of well-known user interfaces such as a keypad and a touch screen.
- each component or feature is to be considered optional unless stated otherwise.
- Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
- Certain operations described in this document as being performed by a base station may in some cases be performed by an upper node thereof. That is, it is obvious 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.
- Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
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Abstract
Description
SS Block | Channel / Signal |
Type#1 | NR-SS |
Type#2 | NR-SS and NR-PBCH |
Type#3 | NR-SS and MRS |
Type#4 | NR-SS, Control Channel |
Type#5 | ... |
Claims (14)
- 무선 통신 시스템에서, 기지국이 동기화 신호를 전송하는 방법에 있어서,복수의 동기화 신호 블록들을 특정 시간 단위 내의 복수의 심볼들에 맵핑하고;상기 복수의 심볼들에 맵핑된 복수의 동기화 신호 블록들을 단말로 전송하는 것을 포함하되,상기 특정 시간 단위의 절반의 길이를 가지는 하프 시간 단위 각각에 적어도 하나의 동기화 신호 블록이 맵핑되는,동기화 신호 블록 전송 방법.
- 제 1 항에 있어서,상기 동기화 신호 블록은 상기 특정 시간 단위 내 상기 하프 시간 단위들 사이의 경계에 걸치지 않도록 맵핑되는,동기화 신호 블록 전송 방법.
- 제 1 항에 있어서,상기 복수의 동기화 신호 블록들은,상기 복수의 심볼들 중, 적어도 가장 앞에 위치한 2개의 심볼들에는 맵핑 되지 않는,동기화 신호 블록 전송 방법.
- 제 1 항에 있어서,상기 복수의 동기화 신호 블록들은,상기 복수의 심볼들 중, 적어도 가장 마지막에 위치한 2개의 심볼들에는 맵핑 되지 않는,동기화 신호 블록 전송 방법.
- 제 1 항에 있어서,상기 복수의 동기화 신호 블록들 각각은, 연속된 4개의 심볼들에 맵핑되는,동기화 신호 블록 전송 방법.
- 제 1 항에 있어서,상기 복수의 동기화 신호 블록들의 배치는,상기 특정 시간 단위 주기로 결정되어, 매 특정 시간 단위마다 동일한 배치 패턴이 반복 적용되는,동기화 신호 블록 전송 방법.
- 제 1 항에 있어서,상기 특정 시간 단위는,14*n개의 심볼들로 구분되며, 상기 n은, 정수이고, 부반송파 간격에 따라 결정되는,동기화 신호 블록 전송 방법.
- 무선 통신 시스템에서, 동기화 신호 블록을 전송하는 기지국에 있어서,단말과 무선 신호를 송수신하는 RF 유닛; 및상기 RF 유닛과 연결되어, 복수의 동기화 신호 블록들을 특정 시간 단위 내의 복수의 심볼들에 맵핑하고, 상기 복수의 심볼들에 맵핑된 복수의 동기화 신호 블록들을 단말로 전송하되, 상기 특정 시간 단위의 절반의 길이를 가지는 하프 시간 단위 각각에 적어도 하나의 동기화 신호 블록이 맵핑되도록 하는, 프로세서를 포함하는,기지국.
- 제 8 항에 있어서,상기 동기화 신호 블록은 상기 특정 시간 단위 내 상기 하프 시간 단위들 사이의 경계에 걸치지 않도록 맵핑되는,기지국.
- 제 8 항에 있어서,상기 복수의 동기화 신호 블록들은,상기 복수의 심볼들 중, 적어도 가장 앞에 위치한 2개의 심볼들에는 맵핑 되지 않는,기지국.
- 제 8 항에 있어서,상기 복수의 동기화 신호 블록들은,상기 복수의 심볼들 중, 적어도 가장 마지막에 위치한 2개의 심볼들에는 맵핑 되지 않는,기지국.
- 제 8 항에 있어서,상기 복수의 동기화 신호 블록들 각각은, 연속된 4개의 심볼들에 맵핑되는,기지국.
- 제 8 항에 있어서,상기 복수의 동기화 신호 블록들의 배치는,상기 특정 시간 단위 주기로 결정되어, 매 특정 시간 단위마다 동일한 배치 패턴이 반복 적용되는,기지국.
- 제 8 항에 있어서,상기 특정 시간 단위는,14*n개의 심볼들로 구분되며, 상기 n은, 정수이고, 부반송파 간격에 따라 결정되는,기지국.
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EP17869754.6A EP3540987A4 (en) | 2016-11-09 | 2017-11-08 | METHOD FOR TRANSMITTING A SYNCHRONIZATION SIGNAL AND ASSOCIATED DEVICE |
CN201780069028.2A CN109923807B (zh) | 2016-11-09 | 2017-11-08 | 发送同步信号的方法及其设备 |
KR1020187012664A KR101958791B1 (ko) | 2016-11-09 | 2017-11-08 | 동기화 신호 전송 방법 및 이를 위한 장치 |
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US16/535,907 US10674461B2 (en) | 2016-11-09 | 2019-08-08 | Method for transmitting synchronization signal and device therefor |
US16/856,854 US11178626B2 (en) | 2016-11-09 | 2020-04-23 | Method for transmitting synchronization signal and device therefor |
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- 2017-11-08 WO PCT/KR2017/012594 patent/WO2018088795A1/ko unknown
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Also Published As
Publication number | Publication date |
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US20180376440A1 (en) | 2018-12-27 |
JP7173963B2 (ja) | 2022-11-16 |
US11178626B2 (en) | 2021-11-16 |
CN109923807B (zh) | 2021-07-13 |
EP3540987A1 (en) | 2019-09-18 |
JP2019536303A (ja) | 2019-12-12 |
KR102074291B1 (ko) | 2020-02-06 |
CN109923807A (zh) | 2019-06-21 |
US10674461B2 (en) | 2020-06-02 |
US20190364529A1 (en) | 2019-11-28 |
KR20180056773A (ko) | 2018-05-29 |
KR20190026980A (ko) | 2019-03-13 |
US20200260395A1 (en) | 2020-08-13 |
EP3540987A4 (en) | 2020-07-08 |
KR101958791B1 (ko) | 2019-03-15 |
US10674460B2 (en) | 2020-06-02 |
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