WO2014069953A1 - 동기 신호 수신 방법 및 사용자기기와, 동기 신호 전송 방법 및 기지국 - Google Patents
동기 신호 수신 방법 및 사용자기기와, 동기 신호 전송 방법 및 기지국 Download PDFInfo
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- WO2014069953A1 WO2014069953A1 PCT/KR2013/009895 KR2013009895W WO2014069953A1 WO 2014069953 A1 WO2014069953 A1 WO 2014069953A1 KR 2013009895 W KR2013009895 W KR 2013009895W WO 2014069953 A1 WO2014069953 A1 WO 2014069953A1
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- synchronization signal
- cell
- resource
- signal resource
- frequency
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
-
- 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
- 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
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Definitions
- the present invention relates to a wireless communication system.
- the present invention relates to a method and apparatus for transmitting and / or receiving a synchronization signal.
- M2M machine-to-machine
- MTC machine type communication
- PC personal computer
- a typical wireless communication system performs data transmission / reception over one downlink (DL) band and one uplink (UL) band corresponding thereto (frequency division duplex (FDD). Mode), or divides a predetermined radio frame into an uplink time unit and a downlink time unit in a time domain, and performs data transmission / reception through uplink / downlink time units Time division duplex (TDD) mode).
- a base station (BS) and a user equipment (UE) transmit and receive data and / or control information scheduled in a predetermined time unit, for example, a subframe (SF). Data is transmitted and received through the data area set in the uplink / downlink subframe, and control information is transmitted and received through the control area set in the uplink / downlink subframe.
- the carrier aggregation technique can collect a plurality of uplink / downlink frequency blocks to use a wider frequency band and use a larger uplink / downlink bandwidth so that a larger amount of signals can be processed simultaneously than when a single carrier is used. .
- a node is one or more antennas It is a fixed point that can transmit / receive radio signals with user equipment.
- a communication system having a high density of nodes can provide higher performance communication services to user equipment by cooperation between nodes.
- the present invention predefines time-frequency resources that can be used for transmission or reception of a synchronization signal, and implicitly displays or acquires system information of a cell using the synchronization signal using the time-frequency resources.
- a synchronization signal transmission method and user equipment, a synchronization signal reception method, and a base station are provided.
- the synchronization signal when a user equipment receives a synchronization signal, the synchronization signal is received from one synchronization signal resource among a plurality of synchronization signal resource candidates; And acquiring system information of the cell based on which one of the plurality of synchronization signal resource candidates is the synchronization signal resource carrying the synchronization signal signal.
- the type of base station that acquires length information and / or transmits the synchronization signal may be distinguished.
- a user equipment comprising a radio frequency (RF) unit and a processor configured to control the RF unit in receiving a synchronization signal.
- the processor may control the RF unit to receive the synchronization signal from one synchronization signal resource among a plurality of synchronization signal resource candidates.
- the processor detects a cell identifier of a cell including the sync signal based on which sync signal resource candidate among the plurality of sync signal resource candidates is the sync signal resource carrying the sync signal signal, and synchronizes with the sal. Acquisition may be configured to acquire length information of a cyclic prefix applied to the cell and / or to distinguish a type of a base station transmitting the synchronization signal.
- a synchronization signal transmission method in which a base station transmits the synchronization signal on at least one synchronization signal resource among a plurality of synchronization signal resource candidates.
- the synchronization signal may correspond to a cell identifier of a cell associated with the synchronization signal, a time synchronization of the cell, a length of a cyclic prefix applied to the cell, and / or a type of the base station. Can be sent.
- a base station comprising a processor configured to control a radio frequency (RF) unit and the RF unit in transmitting a synchronization signal.
- the processor may determine, in incrementing a plurality of synchronization signal resource candidates, a cell identifier of a cell associated with the synchronization signal, a time synchronization of the cell, a length of a cyclic prefix applied to the sal, and / or a type of the base station.
- the RF unit may be controlled to transmit the synchronization signal in a synchronization signal resource.
- each synchronization signal resource candidate of the plurality of synchronization signal resource candidates is one or more frequency resources of at least a plurality of predetermined frequency resources or one or more times of a plurality of predetermined time resources. It may be one defined by a resource.
- the plurality of predefined frequency resources may be orthogonal to each other, and each of the plurality of predefined frequency resources may be configured with contiguous subcarriers on a frequency axis.
- the plurality of predetermined time resources may be respectively referred to a plurality of orthogonal frequency division multiplexing (OFDM) symbols.
- the plurality of OFDM symbols may be set for ⁇ '( ⁇ 1) OFDM symbols in the time domain.
- the plurality of synchronization signal resource candidates may be defined such that a plurality of cell identifiers are treated one-to-one on each of a plurality of grouped sal identifier groups or on the plurality of sal identifiers. have.
- one or more sync signal resource candidates among the plurality of sync signal resource candidates may be defined to correspond one-to-one with one or more subframes in a frame including a plurality of subframes.
- each sync signal resource candidate of the plurality of sync signal resource candidates may be defined to correspond to one of a plurality of CP length increments.
- the plurality of synchronization signal resource candidates may be defined to match one of a plurality of base station types.
- the present invention it is possible to efficiently transmit / receive a signal in a frequency band newly introduced for use. This increases the overall throughput thrcmghpmt of the wireless communication system.
- FIG. 1 illustrates a distributed antenna system (DAS), which is a kind of multi-node system.
- DAS distributed antenna system
- FIG. 2 is a diagram for describing a concept of a BTS (Base Transceiver System) hotel of a multi-node system.
- BTS Base Transceiver System
- LTE Long Term Evolution
- FIG. 4 illustrates a radio frame structure for transmission of a synchronization signal (SS).
- SS synchronization signal
- FIG. 6 shows an example of a synchronization signal transmission method according to an embodiment of the present invention.
- FIG. 7 illustrates an example of mapping synchronization signal detection resource and sal identifier (ID) information according to an embodiment of the present invention.
- mapping synchronization signal detection resource and cyclic prefix (CP) length information illustrates an example of mapping synchronization signal detection resource and cyclic prefix (CP) length information according to an embodiment of the present invention.
- mapping synchronization signal detection resource and e NB type information illustrates an example of mapping synchronization signal detection resource and e NB type information according to an embodiment of the present invention.
- FIG. 10 is a block diagram illustrating components of a transmitter 10 and a receiver 20 for implementing the present invention.
- multiple access systems include CDMA (code division multiple access) system, (frequency division multiple access) system, FDMA, TDMA (time division multiple access) system, OFDMA (orthogonal frequency division multiple access ) ⁇ ") system, SC- FDMA ( a single carrier frequency division multiple access (MC-FDMA) system, a multi-carrier frequency division multiple access (MC-FDMA) system, etc.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC- FDMA single carrier frequency division multiple access
- MC-FDMA multi-carrier frequency division multiple access
- CDMA may be implemented in a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented in wireless technologies such as Global System for Mobile Communication (GSM), General Packet Radio Service (GPRS), Enhanced Data Rates for GSM Evolution (EDGE) (ie, GERAN), etc.
- GSM Global System for Mobile Communication
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA is an IEEE (Institute).
- UE can be implemented in wireless technologies such as 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802-20, e-UTRA (evolved-UTRA), etc.
- UTRA is a Universal Mobile Telecommunication Syst em) and 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of E-UMTS using E-UTRA 3GPP LTE adopts OFDMA for downlink (DL) and uplink (uplink, UL) adopts SC-FDMA.
- LTE-advanced (LTE-A) is an evolution of 3GPP LTE. For convenience of explanation, hereinafter, it will be described on the assumption that the present invention is applied to 3GPP LTE / LTE-A. However, the technical features of the present invention are not limited thereto.
- any other mobile communication except for those specific to 3GPP LTE / LTE-A may be used. Applicable to the system as well.
- an eNB allocates a downlink / uplink time / frequency resource to a UE, and the UE receives a downlink signal according to the allocation of the eNB and uplinks. It can be applied to contention-based communication such as Wi-Fi as well as non-contention based communication for transmitting signals.
- the non-competition based communication technique uses an access point (AP) or a control node controlling the access point to allocate resources for communication between the UE and the AP. Communication resources are occupied through contention between multiple UEs trying to access an AP.
- the contention-based communication method is a kind of contention-based communication method (carrier sense multiple access, CSMA, which is a node or communication device that transmits traffic on a shared transmission medium (also known as a shared channel), such as a frequency band, on the same shared transmission medium. Probabilistic media access control (MAC) protocol that identifies no other traffic.
- CSMA carrier sense multiple access
- the transmitting device determines if another transmission is in progress before attempting to send traffic to the receiving device. In other words, the transmission device attempts to detect the presence of a carrier from another transmission device before attempting transmission. When the carrier is detected, the transmission device waits for transmission to be completed by another transmission device in progress before initiating its transmission.
- CSMA is a communication technique based on the principle of "sense before transmit” or “listen before talk". Used by CSMA / CD (Cairier Sense Multiple Access with Collision Detection) and / or CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) as a technique to avoid collisions between transmission devices in a competitive communication system using CSMA. do.
- CSMA / CD is a collision detection technique in a wired LAN environment. First, a PC or a server that wants to communicate in an Ethernet environment checks if a communication occurs on the network, and then another device If you are sending on the network, wait and send data.
- CSMA / CD monitors the stratums to allow flexible data transmission. It is a technique.
- a transmission device using CSMA / CD detects data transmission by another transmission device and adjusts its own data transmission using specific rules.
- CSMA / CA is a media access control protocol specified in the IEEE 802.1 1 standard.
- WLAN systems according to the IEEE 802.11 standard use a CA, that is, a method of avoiding stagnation, without using the CSMA / CD used in the IEEE 802.3 standard.
- the transmitting devices always detect the carrier of the network, and when the network is empty, it waits for a predetermined time according to its position on the list and sends data.
- Various methods are used to prioritize and reconfigure transmission devices within a list.
- stratification may occur, in which a collision detection procedure is performed.
- Transmission devices using CSMA / CA use specific rules to avoid collisions between data transmissions by other transmission devices and their data transmissions.
- a subframe in which a broadcast signal is transmitted is called a broadcast subframe or a physical broadcast channel (PBCH) subframe, and is referred to as a synchronization signal (eg, a primary synchronization signal, PSS) and / or a subframe through which a secondary synchronization signal (SSS) is transmitted is referred to as a synchronization signal subframe or a PSS / SSS subframe, in which the PSS / SSS is allocated or configured.
- / Subcarrier / RE is referred to as PSS / SSS symbol / subcarrier / RE, respectively, where RE means resource element.
- a user equipment may be fixed or mobile, and various devices that transmit and receive user data and / or various control information by communicating with a base station (BS) may be connected thereto. Belong.
- the UE is a terminal equipment (MS), mobile station (MS), mobile terminal (MT), user terminal (UT), subscriber station (SS), wireless device (wireless device), personal digital assistant (PDA), wireless modem (wireless). modem, handheld device, and the like.
- a BS generally refers to a fixed station communicating with the UE and / or another BS, and communicates with the UE and another BS to exchange various data and control information.
- the BS may be referred to in other terms such as ABS (Advanced Base Station), NB (Node-B), eNB (evolved-NodeB), BTS (Base Transceiver System), Access Point (Access Point), and Processing Server (PS).
- ABS Advanced Base Station
- NB Node-B
- eNB evolved-NodeB
- BTS Base Transceiver System
- Access Point Access Point
- PS Processing Server
- BS is collectively referred to as eNB.
- a node refers to a fixed point capable of transmitting / receiving a radio signal by communicating with a UE.
- a UE is also called a node or a point in a specific wireless communication standard, in the present invention, the term node is used as a concept in contrast to the UE.
- a node may be referred to as an access point or an access node in view of a point of access by a UE rather than a UE.
- the node may be a BS, an NB, an eNB, a pico-cell eNB (PeNB), a home eNB (HeNB), a relay, a repeater, and the like.
- the node may not be an eNB.
- it may be a radio remote head (RRH), a radio remote unit (RRU).
- RRH, RRU, etc. generally have a power level lower than the power level of the eNB.
- RRH or RRU (hereinafter referred to as RRH / RRU) is generally connected to an eNB by a dedicated line such as an optical cable, so that RRH / RRU is generally compared to cooperative communication by eNBs connected by wireless wire. And cooperative communication by eNB er 1 It can be performed smoothly.
- At least one antenna is installed at one node.
- the antenna may mean a physical antenna or may mean an antenna port, a virtual antenna, or an antenna group. Nodes are also called points.
- the same cell identifier identity, ID
- ID cell ID
- each of the plurality of nodes When a plurality of nodes have the same cell ID, each of the plurality of nodes operates like a partial antenna group of one cell. In a multi-node system, if the nodes have different sal IDs, then this multi-node system is a multi-cell (e.g., macro-cell / femto-cell / pico-sal) system. It can be seen.
- the network formed by the multiple cells is particularly called a multi-tier network.
- the cell ID of the RRH RRU and the cell ID of the eNB may be the same or may be different. When the RRH / RRU and the eNB use different cell IDs, both the RRH / RRU and the eNB operate as independent base stations.
- one or more eNBs or eNB controllers connected to a plurality of nodes may control the plurality of nodes to simultaneously transmit or receive signals to the UE through some or all of the plurality of nodes.
- These multi-node systems are different from single node systems (eg CAS, conventional MIMO systems, conventional incremental systems, conventional repeater systems, etc.).
- embodiments of the present invention regarding a method for performing data cooperative transmission using some or all of a plurality of nodes may be applied to various types of multi-node systems.
- a node generally refers to an antenna group spaced apart from another node by a predetermined distance or more
- embodiments of the present invention described later may be applied to a case in which the node means any antenna group regardless of the interval.
- the eNB in case of an eNB equipped with a cross-polarized (X-pol) antenna, the eNB is configured with an H-pol antenna and a V-po!
- the embodiment of the present invention may be applied to control the node configured as the antenna.
- [44] Transmit / receive a signal through a plurality of transmit (Tx) / receive (Rx) nodes, or transmit a signal through at least one node selected from among a plurality of transmit / receive nodes
- a multi-eNB MIMO or CoMP (Coordinated) communication scheme that allows a node to transmit / receive or transmit a downlink signal to a node that receives an uplink signal differently.
- the cooperative transmission scheme of such cooperative communication between nodes can be largely divided into JP (joint processing) and scheduling coordination.
- the former may be divided into joint transmission (JT) /] (intended reception) and dynamic point selection (DPS), and the latter may be divided into coordinated scheduling (CS) and coordinated beamforming (CB).
- DPS is also called dynamic cell selection (DCS).
- JT in JP refers to a communication scheme in which a plurality of nodes transmit the same stream to the UE
- JR refers to a communication scheme in which a plurality of nodes receive the same stream from the UE.
- JP enhancement DPS refers to a communication technique in which a signal is transmitted / received through a node selected according to a plurality of node enhancement specific rules.
- FIG. 1 illustrates a distributed antenna system (DAS), which is a kind of a multi-node system.
- DAS distributed antenna system
- a DAS is composed of an eNB and antenna nodes connected to the eNB.
- An antenna node may also be referred to as an antenna node, an antenna cluster, or the like.
- the antenna node is connected to the eNB by wire or wirelessly and may include one or several antennas.
- the antennas belonging to one antenna node have the characteristic that the distance between the nearest antennas is locally within the same spot within a few meters, and the antenna node serves as an antenna point to which the UE can connect. Do
- a centralized antenna system in which antennas of an eNB are concentrated in a center of a DAS, antennas managed by one eNB are spread at various locations in a cell.
- the DAS is distinguished from a femto cell or a pico cell in that several antenna nodes constitute one cell, which are difficult to be located at a point as they are disposed apart from each other by a predetermined interval or more.
- the initial DAS was Additional antennas were used to cover the shadow area, which was used to repeat the same signal.
- DAS is similar to a multiple input multiple output (MIMO) system in that the antennas of an eNB can send or receive multiple data streams simultaneously to support a single UE or multiple UEs.
- MIMO multiple input multiple output
- antennas concentrated at one point of an eNB participate in communication with a UE, while in a DAS, at least one of the distributed nodes of the eNB participates in communication with the UE.
- the DAS has a high power efficiency, a high channel capacity due to the correlation and interference between the low eNB antennas, which is obtained by reducing the distance between the UE and the antenna compared to the CAS, and where the UE is in the cell. Regardless of the location, there is an advantage that a relatively uniform quality of communication performance is secured.
- a cell refers to a certain geographic area in which one or more nodes provide a communication service. Therefore, in the present invention, communicating with a specific cell may mean communicating with an eNB or a node that provides a communication service to the specific cell.
- the downlink / uplink signal of a particular cell means a downlink / uplink signal to / from an eNB or a node that provides a communication service to the specific cell. It is called a serving cell, in particular, a serving cell, which provides uplink / downlink communication services to the UE.
- the channel state / quality of a particular cell refers to the channel state / quality of the channel or communication link formed between the eNB or the node and the UE providing the communication service to the particular cell.
- the UE is in a downlink channel state from a specific node and the CRS in which the antenna port (s) of the specific node are transmitted on a Cell-specific Reference Signal (CRS) resource allocated to the specific node. (S) and / or CSI-RS (s) transmitted on Channel State Information Reference Signal (CSI-RS) resources.
- CRS Cell-specific Reference Signal
- S Cell-specific Reference Signal
- CSI-RS Channel State Information Reference Signal
- the 3GPP LTE / LTE-A system uses the concept of a cell to manage a radio resource.
- a cell associated with a radio resource is distinguished from a cell of a geographic area.
- a typical wireless communication system performs data transmission or reception through one DL band and a corresponding UL band (in frequency division duplex (FDD) mode) or a predetermined radio frame (radio).
- a frame is divided into an uplink time unit and a downlink time unit in a time domain, and data transmission or reception is performed through uplink / downlink time units (time division duplex (TDD) mode).
- TDD time division duplex
- CA Carrier aggregation
- CA performs DL or UL communication by using a plurality of carrier frequencies.
- each component carrier being the carrier aggregation by the carrier aggregation: referred to as (component carrier CC).
- component carrier CC being the carrier aggregation by the carrier aggregation: referred to as (component carrier CC).
- component carrier CC three 20 MHz CCs may be gathered in the UL and the DL to support a 60 MHz bandwidth.
- Each CC may be adjacent or non-adjacent to each other in the frequency domain.
- the bandwidth of the UL CC and the bandwidth of the DL CC may be the same, the bandwidth of each CC may be determined independently.
- a DL / UL CC limited to a specific UE may be referred to as a configured serving UL / DL CC at a specific UE.
- the 3GPP LTE-A standard uses the concept of "cell" for the management of radio resources.
- "Sal" associated with a radio resource is defined by a combination of downlink resources (DL resources) and uplink resources (UL resources).
- a "cell" of radio resources may be configured as a DL resource alone, or a combination of DL and UL resources, or a combination of UL resources alone.
- the linkage between the carrier frequency of the DL resource and the carrier frequency of the UL resource may be indicated by system information.
- a combination of DL and UL resources may be indicated by a System Information Block Type 2 (SIB2) linkage.
- SIB2 System Information Block Type 2
- the carrier frequency means the center frequency (center frequency) of each cell or CC.
- a slice that operates on a primary frequency is called a primary cell (PCell) or PCC
- a cell that operates on a secondary frequency (secondary frequency) is called a secondary cell (SCell) or SCC.
- SCell secondary cell
- the carrier referred to the PCell is called a downlink primary CC (DL PCC)
- DL PCC downlink primary CC
- DL PCC downlink primary CC
- DL PCC UL primary CC
- SCeli refers to a cell that can be configured after RRC connection establishment and can be used for providing additional security radio resources.
- the SCell may, together with the PCell, form a set of serving cells for the UE.
- the carrier corresponding to the SCell in downlink is called a DL secondary CC (DL SCC), and the carrier corresponds to the SCell in uplink.
- the corresponding carrier is called a UL secondary CC (UL SCC).
- RRC In case of UE that is in CONNECTED state but carrier aggregation is not configured or carrier aggregation is not supported, there is only one serving cell configured only for PCell.
- a "cell" of a geographic area may be understood as a coverage in which a node can provide a service using a carrier, and a "sal" of a radio resource is a frequency range configured by the carrier. Is associated with bandwidth (BW). Downlink coverage, which is a range within which a node can transmit a signal of a valid strength, and uplink coverage, which is a range in which a signal of a valid strength can be received from a UE, depends on a distance that a carrier carrying the signal depends on. Discarding is also associated with coverage of the "sal" of radio resources used by the node.
- the term "cell" can sometimes be used to mean coverage of a service by a node, sometimes a radio resource, and sometimes a range within which a signal using the radio resource can reach a valid strength.
- FIG. 2 is a diagram for describing a concept of a BTS (Base Transceiver System) hotel of a multi-node system.
- FIG. 2 (a) shows a traditional Radio Access Network (RAN) architecture
- FIG. 2 (b) shows a small sal RAN cage with a BTS hotel and a DAS. It is. The concept of a small shell is explained in more detail in FIG.
- RAN Radio Access Network
- each BTS manages 3 ⁇ sectors, and each eNB performs a base station controller (BSC) / backbone through a backbone network. It is connected to RNC (adio Network Controller).
- RNC radio Network Controller
- eNBs connected to each antenna node may be collected in one place (BTS hotel).
- BTS hotel the BTS and the Mobile Switching Center (MSC) / BSC / RNC are all installed in one place. By doing this, the backhaul capacity can be increased.
- LTE Long Term Evolution
- a duration of a radio frame used in an existing LTE / LTE-A system is 10ms (307200 s ), and one radio frame has 10 equally sized subframes (SF). It is composed of Numbers may be assigned to 10 subframes in one radio frame.
- T s represents the sampling time
- s l / (2048 * 15kHz)
- the time for transmitting one subframe is defined as a transmission time interval (TTI).
- the time resource may be classified by a radio frame number (also called a radio frame index), a subframe number (black is also called a subframe number), a slot number (or slot index), and the like.
- the existing LTE / LTE-A system supports two types of frame structures according to the length of a cyclic prefix (CP) as shown in FIG. 3.
- CP cyclic prefix
- one slot includes seven OFDM symbols in the case of a normal CP, and one slot includes six OFDM symbols in the case of an extended CP.
- an OFDM symbol may be called an OFDM symbol or a single carrier-frequency division multiplexing (SC-FDM) according to a multiple access scheme. Since SC-FDMA can be viewed as a specific form of OFDMA, the term "symbol" or "OFDMA symbol" is used in the present invention to refer to an OFDM symbol and an SC-FDM symbol.
- the length r CP of the normal CP is 160 S 5.1 for the first OFI3M symbol of the subframe and 16 (T S -4.7 // s for the remaining OFDM symbols.
- T CP - e is 512.7; «16.1 ⁇
- T u represents the effective OFDM symbol period, and means the corresponding time of the inverse of the subcarrier interval.
- the LTE / LTE-A system supports two CPs.
- the LTE system covers the environment in the indoor (urban), urban (suburban), rural (rural), and supports the movement speed of the UE up to 350 ⁇ 500km.
- the center frequency of LTE / LTE-A system is generally 400MHz to 4GHz, and the available frequency band is 1.4 to 20MHz. This means that delay spread and Doppler's frequency differ from each other according to the center frequency and the available frequency band.
- subcarrier spacing ⁇ 15kHz
- the length of the CP is about 4.7 zs
- the subcarrier spacing is the same as the normal CP and the length of the CP is about 16.7 s.
- the subcarrier spacing is predetermined, and the subcarrier spacing corresponds to a value obtained by dividing the sampling frequency by the FFT size.
- the extended CP may be used for a suburban cell or a rural cell with a relatively large coverage due to a long CP duration.
- an extended CP having a relatively long length is required to reliably solve inter symbol interference (ISI).
- ISI inter symbol interference
- the CP overhead is increased relative to the normal CP, so that the increase in the CP length causes a loss in spectral efficiency and / or transmission resource.
- design criteria design criterion
- T CP denotes a length of CP
- / dmax denotes a (maximum) Doppler frequency
- ⁇ / denotes a subcarrier spacing.
- ⁇ ⁇ represents the maximum excess delay or the maximum channel delay
- PDF power delay profile
- Equation 1 is a criterion for preventing ISI
- Equation 2 is a criterion for sufficiently maintaining inter-cell interference (ICI) according to Doppler
- Equation 3 is a specification. It is a standard for spectral efficiency.
- a UE cell search is performed to access a CC or a cell using the CC.
- the cell discovery is a process in which the UE acquires time and frequency synchronization with the CC and detects a (physical layer) cell identity (ID) of the CC.
- Cell search may also be understood as a process of acquiring time and frequency synchronization with a cell using the CC and detecting a cell ID of the cell.
- PSS primary synchronization signal
- SSS secondary synchronization signal
- FIG. 4 illustrates a radio frame structure for transmission of a synchronization signal (SS).
- FIG. 4 illustrates a radio frame structure for transmission of a synchronization signal and a PBCH in frequency division duplex (FDD)
- FIG. 4 (a) is a radio configured as a normal CP.
- 4 shows transmission positions of SS and PBCH in a frame
- FIG. 4B shows transmission positions of SS and PBCH in a radio frame configured 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 frame synchronization, identifier of a cell ID group and / or CP configuration of a cell (i.e., regular CP). Or usage information of the extended CP).
- PSS and SSS are transmitted in two OFDM symbols of each radio frame.
- 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
- the SSS is the second to second OFDM symbols and subframe of the first slot of subframe 0, respectively. Are transmitted in the second to the second OFDM symbol of the first slot of five 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.
- SS transmission The diversity scheme uses only a single antenna port and is not defined in the standard. That is, a single antenna port transmission or a transparent transmission scheme (eg, Precoding Vector Switching (PVS), Time Switched Diversity (TSTD), and cyclic delay diversity (CDD)) may be used for transmission diversity of the SS. .
- PVS Precoding Vector Switching
- TSTD Time Switched Diversity
- CDD cyclic delay diversity
- the SS may represent a total of 504 unique physical layer cell IDs through a combination of three PSSs and 168 SSs.
- the physical layer cell IDs include 168 physical-layer cell-identifier groups each including three unique identifiers such that each physical layer cell ID is only part of one physical-layer cell-identifier group. Are grouped together.
- physical layer cell identifier 3N ID + is a number W in the range from 0 to 167 representing a physical-layer cell-identifier group and from 0 to 2 representing the physical-layer identifier in the physical-layer sal-identifier group. Is uniquely defined by the number 2) 10 .
- the UE can detect the PSS and know one of three unique physical-layer identifiers, and can detect the SSS to identify one of the 168 physical layer cell IDs associated with the physical- conflict identifier.
- Nine remaining subcarriers of the 72 subcarriers always carry a value of 0, which serves as an element for facilitating a filter design for synchronization.
- 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. However, the corresponding subframe is the subframe 0 and the subframe. It is unknown what of 5 is 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 since the distances between the SSs in the normal CP and the distances of the SSs in the extended CP are different, the UE detects the SSs so that the corresponding cell uses the normal CP or expands. Know if you are using CP.
- the LTE system is considering introducing a local area.
- local area access to enhance service support per user or per UE
- This local area is called a small cell.
- FIG. 5 is shown for explaining the concept of a small cell (sm l cdl).
- a configuration for a cell having a wider system bandwidth than that of an existing LTE system is configured in a band having a higher center frequency than a band having an augment frequency operated in an existing LTE system.
- Subcamer spacing When the same OFDM-based frame structure as the LTE system is applied, an extremely larger value than the existing subcarrier spacing of 15 kHz may be set as the subcarrier spacing because the allocated frequency bandwidth is large. have.
- Doppler's frequency Since a high frequency band is used, a higher Doppler frequency may appear than when a low frequency band is used for a UE of the same speed. Accordingly, the coherent time, which is the time duration in which the channel impulse response is considered unchanged in the communication system, can be extremely shortened.
- the present invention proposes a frame structure for high frequency band transmission.
- the delay spread of the channel tends to be short, and the path loss of the channel increases greatly in the high frequency band, and thus the stable performance is closer to the eNB. Can be guaranteed. therefore In the future, it is expected that a small cell structure will be introduced in the high frequency band communication compared to the conventional cell lor communication, and OFDM, which is a multiple access technique, is expected to be used in the same way due to the ease of resource utilization and control.
- the present invention proposes a synchronization signal transmission scheme for high frequency band transmission that is expected to be introduced in the future.
- the conventional single (OF-VI) symbol and / or a single sequence based synchronization signal such as LTE / LTE-A may enable the UE to perform synchronization. Due to the poor performance, it may not be possible to obtain time / frequency synchronization with the cell or CC (hereafter referred to as cell / CC). Therefore, the present invention proposes a new synchronization signal transmission / reception scheme that can be directed toward the development direction of the next generation communication system.
- the synchronization signal transmission / reception scheme according to the present invention is designed in consideration of the following matters and / or to satisfy the following requirements.
- the center frequency band of 5GHz or more or tens of GHz or more is being discussed instead of the channel environment of 5GHz or less in which a conventional Celller system or WiFi is operated. This is because in the case of the existing frequency band around 2 GHz, there is no longer a valid and usable band, and it is unlikely that a wider frequency band can be secured only by the existing available frequency band alone. In addition, there are many restrictions on the existing available frequency bands, and there are many restrictions on the repurpose and use of the existing available frequency bands.
- next-generation communications the user's required transmission rate is based on the ultra-high definition, which is based on the existing full high definition (HD) -based HD-based service.
- ultra-high definition which is based on the existing full high definition (HD) -based HD-based service.
- the present invention provides a synchronization signal for all frequency bands in a next generation communication system that will provide a service using a frequency band having a system bandwidth of several hundred MHz and several GHz. It is proposed to perform the synchronization signal transmission by limiting to a specific region rather than transmitting. According to the present invention, since the synchronization signal is transmitted in a limited time-frequency region, the synchronization signal transmission power may be concentrated and allocated. In addition, since the PSS / SSS of the existing LTE / LTE-A is transmitted in six RBs close to the center frequency in the predefined OFDM symbol, the synchronization signals of the small cells may have a strong interference with each other in small cells with high density. high.
- the time-frequency resources to which the synchronization signal can be transmitted are defined in plural along the time and / or frequency axis, it is possible to adjust the synchronization signals of adjacent cells to be transmitted on different time-frequency resources. Do. Therefore, according to the present invention, the inter-cell interference caused by the synchronization signal can be eliminated or mitigated.
- FIG. 6 shows an example of a synchronization signal transmission method according to an embodiment of the present invention.
- the time-frequency resources carrying the synchronization signal may be divided into frequency index « f and time. Can be identified by index f2 t .
- one frequency resource increment and one of four time resources are used for one synchronous signal transmission. Although the case is used, more than one frequency resource and one time resource may be selected respectively in the frequency domain and the time domain.
- the synchronization signal according to the present invention is a combination of ( ⁇ wC ⁇ xdf ⁇ ) time-frequency resources. It can be sent in one of the certificates.
- the frequency index may represent one of Si w t frequency resource combinations
- the time index “ t may represent one of 1 M C m time resource combination stones.
- the UE may obtain cell ID or cell 11> information of a service e NB through a time-frequency resource in which a synchronization signal is detected or transmitted.
- a cell ID or a cell ID group indicated by each region may be predefined.
- the UE may acquire cell ID information implicitly from the resource region where the synchronization signal is detected. For example, if the frequency band of the corresponding cell / CC is divided into 'N sync signal detection bands, and each detection band can be used for transmission of the sync signal, the UE is the last to the sync signal detection band that actually detected the sync signal. By acquiring the information, it is possible to know the cell ID information of the eNB (hereinafter referred to as a service eNB) to which the UE is currently connected.
- a service eNB the cell ID information of the eNB
- the sync signal detection band in which the sync signal is detected is used as information for identifying each cell ID group including a cell ID set.
- cell IDs may be divided into N cell ID groups in which each ID group includes L cell IDs (eg, 10).
- 10 cell IDs are N sync signals.
- 10 ⁇ N IDs may be associated with the signal detection regions.
- a predetermined number of time-frequency resources to which the eNB can transmit a synchronization signal are defined, and the eNB corresponds to a Sal ID of a Sal / CC controlled or managed by the eNB among the predefined time-frequency resources.
- the synchronization signal may be transmitted on a time-frequency resource.
- the UE may acquire the synchronization signal of the cell / CC from the predefined time-frequency resources of increasing the resources in the frequency band of the Sal or CC being searched for the cell or the cell to which the UE is to be connected.
- the resources become synchronization signal detection resource candidates for which the UE can detect the synchronization signal of the cell / CC.
- the UE may detect a synchronization signal in any one of the predefined time-frequency resources by monitoring the predefined time-frequency resources.
- the UE may know the cell ID group to which the cell ID or cell ID of the cell / CC belongs based on which of the predefined time_frequency resources is actually detected from the sync signal.
- mapping synchronization signal detection resource and cell ID information illustrates an example of mapping synchronization signal detection resource and cell ID information according to an embodiment of the present invention.
- FIG. 7 illustrates a case in which all of the predefined synchronization signal detection bands are located in one OFDM symbol, that is, the time resources of the predefined synchronization signal detection bands are all the same. However, unlike FIG. It is also possible that synchronization signal detection resources are defined such that the time resources of each of the detection bands are different from each other.
- all synchronization signal detection resources associated with all cell IDs may be set in one OFDM symbol such that the (minimum) interval between synchronization signal detection time resources is zero, but the (minimum) between synchronization signal ' detection time resources
- the interval may be set on the time axis to be G ( ⁇ l).
- the eNB may transmit a synchronization signal through a synchronization signal detection band allocating a cell ID group to which the corresponding cell ID belongs, and the UE monitors four synchronization signal detection bands and detects a synchronization signal in one of them. Can be.
- the UE determines whether the synchronization signal detection band in which the synchronization signal is detected is one of the four synchronization signal detection bands, that is, the synchronization signal detection band carrying the synchronization signal is one of the four synchronization signal detection bands. According to the recognition, the cell ID group to which the cell ID of the cell / CC using the synchronization signal belongs may be identified.
- the UE When the synchronization signal detection resources and the cell IDs stand for one-to-one, if the UE knows the synchronization signal detection resource carrying the synchronization signal, the UE identifies the cell ID of the synchronization signal detection resource as the cell ID of the corresponding cell / CC. You can judge. When the number of cell IDs is larger than the sync signal detection resources, the sync signal detection resources may be mapped to a plurality of cell ID groups, in which cell IDs used in the system are grouped.
- the UE detects a synchronization signal from one synchronization signal detection resource among a plurality of synchronization signal detection resources, that is, by detecting a synchronization signal detection resource that actually carries the synchronization signal, thereby identifying a cell ID group to which the cell ID of the corresponding cell / CC belongs.
- Increasing Cell IDs in a Cell ID Group The cell IDs of a corresponding cell / CC can be distinguished by an argument method. For example, as many different synchronization signal sequences as the number of cell IDs belonging to a group can be defined, and the cell ID group to which the corresponding cell ID belongs can be identified by the synchronization signal detection resource carrying the synchronization signal.
- the cell ID among the cell ID (s) in the corresponding cell ID group may be identified by a synchronization signal sequence.
- the UE may acquire network synchronization (eg, frame index and / or subframe index) through time-frequency resources from which a synchronization signal is detected or transmitted.
- network synchronization eg, frame index and / or subframe index
- frame or subframe information indicated by each region may be predefined.
- the UE may implicitly acquire frame or subframe information from the resource region from which the synchronization signal is detected, thereby establishing synchronization with the network.
- the system frame information corresponding to network synchronization may be set in a manner as described in Proposal 1, and multiple frame indexes may be configured as a group, and only information corresponding to one frame may be associated with one time-frequency resource. It is possible.
- the index of the resource where the synchronization signal is detected is directly related to the subframe index. May be associated with For example, the UE may regard the index of the synchronization signal detection resource where the synchronization signal is detected as the index of the subframe in which the synchronization signal is detected. If a frame is composed of a total of four subframes, and four synchronization signal detection resources are located in the four subframes, respectively, and are defined by different frequency resources, the eNB transmits the subsignal when the synchronization signal is transmitted in the subframe.
- the synchronization signal may be transmitted in a synchronization signal detection resource corresponding to an index of a frame, and the synchronization signal may be transmitted in a synchronization signal detection resource corresponding to an index of the other subframe in another subframe. Accordingly, the UE may know the index of the subframe in which the synchronization signal is detected according to which resource among the four synchronization signal detection resources.
- synchronization signal detection resources may be set as different frequency resources on the same time axis.
- the bundle information of the frame / subframe may be mapped to each frequency resource. For example, if all the synchronization signals are transmitted in the first subframe and represent 10 units of subframes / frame indexes for each frequency resource, the UE as a whole synchronizes information about N ⁇ 10 subframes with predefined synchronization. It may be obtained in the process of detecting synchronization signals for signal detection resources.
- each sync signal detection resource may be associated with 10 consecutive subframes. That is, the synchronization signal detection resource # 0 corresponds to the subframes # 0 to the subframe # 9, the synchronization signal detection resource # 1 corresponds to the subframes # 10 to the subframe # 19, and the synchronization signal detection resource # 2 is the subframe.
- the frame # 20 corresponds to the subframe
- the synchronization signal detection resource # 3 corresponds to the subframe # 30 to the subframe # 39
- the synchronization signal detection resource # 4 is defined to be the subframe # 40 to the subframe # 49. Can be.
- the eNB may transmit a synchronization signal every 10 subframes, but may transmit a synchronization signal by using a synchronization signal detection resource associated with the corresponding subframes.
- the eNB may transmit a synchronization signal in synchronization signal detection resource # 0 of a predefined subframe (eg, subframe # 0) of subframes # 0 through subframe # 9, and the UE may transmit a synchronization signal detection resource.
- the synchronization signal is detected at # 0, it may be determined that the subframe in which the synchronization signal has been detected is the predefined subframe among the subframes # 0 to subframe # 9.
- the synchronization signal detection resource ⁇ 0,1, 2 , ..., N'-1 ⁇ may use the first half of frame information as the synchronization signal detection resource ⁇ N ', N' + 1, ..., N ⁇ . Refers to the latter part of the frame information. Specifically, assuming that the synchronization signal detection resource is two, and 5 is set that the synchronization signal is transmitted in subframe # 0 and subframe # 5 in a frame consisting of ten subframes, the UE is set to the synchronization signal detection resource # If the sync signal is detected at 0, it is determined that the subframe in which the sync signal is detected is subframe # 0, which is a first half subframe. If the sync signal is detected in the sync signal detection resource # 2, the subframe in which the sync signal is detected is determined. It may be determined that the subframe # 5, which is the latter subframe of the frame.
- the synchronization signal detection resource is not used.
- one frame consists of 15 subframes and a synchronization signal is transmitted every 5 subframes, for example, in subframe # 0, subframe # 5 and subframe iso, where the synchronization signal is detected. If four resources are assumed, three synchronization signal detection resources may be mapped one-to-one with subframe # 0, subframe # 5, and subframe # 10, respectively, and the remaining synchronization signal detection resources may be unused.
- Proposal 3) ⁇ may obtain CP length information of a frame structure through time-frequency resources in which a synchronization signal is detected or transmitted.
- FIG. 8 illustrates an example of mapping synchronization signal detection resources and cyclic prefix length information according to an embodiment of the present invention.
- the UE according to the present invention may acquire CP information in the synchronization signal detection process.
- the synchronization signal detection resources are divided into two regions and the two synchronization signal detection regions are CP type 1. And by mapping with CP type 2, respectively, it is possible for the UE to implicitly obtain CP length information.
- the eNB sets the frame of the cell / CC to CP type 1 and the eNB transmits a synchronization signal in at least one of the synchronization signal detection resources defined as corresponding to 30 CP type 1 of the synchronization signal detection resources. Can transmit The UE is a synchronization associated with CP type 1 of the synchronization signal detection resources When the synchronization signal is detected from the signal detection resources, it may be determined that the CP length of the corresponding frame corresponds to CP type 1.
- the UE can distinguish the type of service eNB (macro eNB, pico-sal, femto-sal, etc.) through time-frequency resources from which a synchronization signal is detected or transmitted.
- type of service eNB macro eNB, pico-sal, femto-sal, etc.
- mapping synchronization signal detection resource and eNB type information illustrates an example of mapping synchronization signal detection resource and eNB type information according to an embodiment of the present invention.
- the synchronization signal detection resource may be implicitly connected with the type of the service eNB.
- the UE may implicitly obtain the type information of the service eNB to which the UE is connected according to the resource location for detecting the synchronization signal.
- data transmission and service category may be different according to the capability of each eNB. Therefore, according to the present invention, the UE may be configured to check the type of the service eNB based on the synchronization signal detection resource and to actively request the service point selection and the change based on its capability or communication environment.
- the transmission resource of the synchronization signal is changed according to the type of eNB, there is an advantage that the interference between the initial synchronization signals can be surely avoided.
- FIG. 10 is a block diagram showing components of a transmitter 10 and a receiver 20 for carrying out the present invention.
- the transmitter 10 and the receiver 20 are radio frequency (RF) units 13 and 23 capable of transmitting or receiving radio signals carrying information and / or data, signals, messages, and the like. It is operatively connected to components such as memory 12, 22, RF unit 13, 23, and memory 12, 22 for storing various information related to communication in a communication system, thereby controlling the components
- Each of the devices includes a processor 11, 21 configured to control the memory 12, 22 and / or the RF unit B, 23 to perform at least one of the above-described embodiments of the present invention.
- Memory 12, 22 can be utilized as a buffer.
- the processor (11, 21) typically controls the overall operation of the various models in the transmitter or receiver.
- the processors 11 and 21 may perform various control functions for carrying out the present invention.
- the processors (1 1, 21) are controllers, microcontrollers, microprocessors, micro It may also be called a microcomputer.
- the processor ⁇ 21 may be implemented by hardware or firmware, software, or a combination thereof.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- firmware or software when the present invention is implemented using firmware or software, the firmware or software may be configured to include modules, procedures, or functions for performing the functions or operations of the present invention, and may be configured to perform the present invention.
- the firmware or software may be provided in the processor 11 or 21 or stored in the memory 12 or 22 to be driven by the processor 11 or 21.
- [1221 process of the transmission device 10; 11 performs an RF unit 13 after performing a predetermined encoding and modulation on a signal and / or data scheduled from the processor 11 or a scheduler connected to the processor 11 to be transmitted to the outside.
- the processor 11 converts the data sequence to be transmitted into N layer layers through demultiplexing, channel encoding, scrambling, and modulation.
- the coded data string is also called a codeword and is equivalent to a transport block, which is a data block provided by the MAC layer.
- One transport block (TB) is encoded into one codeword, and each codeword is transmitted to a receiving device in the form of one or more layers.
- the RF unit 13 may include an oscillator for frequency upconversion.
- RF unit B may comprise a number of transmit antennas, where N t is a positive integer greater than or equal to one.
- the signal processing process of the receiving device 20 consists of the reverse of the signal processing process of the transmitting device 10.
- the RF unit 23 of the receiver 20 receives a radio signal transmitted by the transmitter 10.
- the RF unit 23 may include N r receive antennas, and the RF unit 23 frequency down-converts each of the signals received through the receive antennas to restore a baseband signal. do.
- RF unit 23 may include an oscillator for frequency downconversion.
- the processor 21 may decode and demodulate a radio signal received through a reception antenna to restore data originally transmitted by the transmission apparatus 10.
- the RF unit 13, 23 is equipped with one or more antennas.
- the antenna transmits a signal processed by the RP units 13 and 23 to the outside, or receives a radio signal from the outside, under the control of the processors 11 and 21, according to an embodiment of the present invention. , 23).
- Antennas are also called antenna ports.
- Each antenna may be configured by one physical antenna or a combination of more than one physical antenna elements.
- the signal transmitted from each antenna can no longer be decomposed by the receiver 20.
- the reference signal (RS) transmitted for the corresponding antenna defines the antenna as viewed from the receiver 20's view and includes the antenna whether the channel is a single wireless channel from one physical antenna or not. Regardless of whether it is a composite channel from a plurality of physical antenna elements, the receiver 20 enables channel estimation for the antenna.
- the antenna is defined such that a channel carrying a symbol on the antenna can be derived from the channel through which another symbol on the same antenna is delivered.
- MIMO multi-input multi-output
- the UE operates as the transmitter 10 in the uplink and operates as the receiver 20 in the downlink.
- the eNB operates as the receiver 20 in the uplink, and operates as the transmitter 10 in the downlink.
- the processor, the RF unit and the memory provided in the UE will be referred to as the UE processor, the UE RF unit and the UE memory, respectively, and the processor, the RF unit and the memory provided in the eNB will be referred to as the eNB processor, the eNB RF unit and the eNB memory, respectively. .
- each node or each transmission point includes an eNB RF unit.
- nodes participating in carrier aggregation may be managed by one or a plurality of eNB processors.
- the cells or CCs participating in the carrier aggregation may be managed by the same eNB processor but may be managed by eNB processors.
- a plurality of synchronization signal detection resources that the eNB can use for transmission of synchronization signals, that is, a plurality of synchronization signal detection resource candidates for which the UE can detect the synchronization signal are included. It is predefined.
- the synchronization signal detection resource candidates may be set according to any one of the embodiments of the present invention described with reference to FIGS. 6 to 9.
- each of the plurality of synchronization signal detection resources is at least One or more of the plurality of predetermined frequency resources and / or one or more of the plurality of predetermined time resources.
- the plurality of predetermined time resource stones may correspond to a plurality of orthogonal frequency division multiplexing (OFDM) symbols, respectively.
- the plurality of OFDM symbols may be set for every 'G' ( ⁇ l) OFDM symbols in the time domain.
- the plurality of synchronization signal detection resource candidates may be defined to be one-to-one on each of the plurality of cell identifier groups in which a plurality of cell identifiers are grouped or on the plurality of cell identifiers.
- one or more synchronization signal resource candidates among the plurality of synchronization signal detection resource candidates may be defined to be one-to-one with one or more subframes in a frame including a plurality of subframes.
- each of the plurality of synchronization signal resource candidates may be defined to satisfy one of a plurality of CP lengths.
- each sync signal resource candidate among the plurality of sync signal resource candidates may be defined to correspond to one of a plurality of base station types.
- the eNB processor may use a synchronization signal to transmit a synchronization signal among a plurality of predefined synchronization signal detection resources based on a cell identifier, a time synchronization, a CP length, and / or an eNB type of a cell / CC to which the synchronization signal is to be transmitted. Detection resources can be set.
- the eNB processor may control the eNB RF unit to transmit the synchronization signal of the corresponding cell / CC on the synchronization signal detection resource based on the cell identifier, time synchronization, CP length, and / or eNB type of the cell / CC to transmit the synchronization signal. .
- the UE processor may monitor the plurality of predefined synchronization signal detection resource candidates. That is, the UE processor may enable the UE RF unit to receive radio signals on the plurality of synchronization signal detection resource candidates, and may attempt to decode the radio signals received on each synchronization signal detection resource candidate.
- the UE processor sends a cell identifier of a Sal / CC based on a synchronization signal detection resource in which a synchronization signal is effectively detected, that is, a synchronization signal detection resource carrying a synchronization signal among the plurality of synchronization signal detection resource candidates. , Time synchronization, CP length and / or eNB type can be obtained.
- the UE processor may determine the cell identifier, the time synchronization, the CP length, and / or the eNB type based on the resource that carries the plurality of synchronization signal detection resource candidates. According to the present invention, a synchronization signal transmission / reception suitable for a frequency band newly introduced in the next generation communication system may be performed, thereby improving system performance.
- Embodiments of the present invention can be used in a wireless communication system, a base station, a user equipment, and other equipment.
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US14/440,042 US9848397B2 (en) | 2012-11-04 | 2013-11-04 | Synchronizing signal receiving method and user equipment, and synchronizing signal transmitting method and base station |
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KR20120001598A (ko) * | 2010-06-28 | 2012-01-04 | 엘지전자 주식회사 | 다중 노드 시스템에서 동기화 신호 전송 방법 및 장치 |
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KR20150087842A (ko) | 2015-07-30 |
KR101697601B1 (ko) | 2017-01-18 |
US9848397B2 (en) | 2017-12-19 |
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