WO2020096166A1 - Synchronization method and device for 5g relay system in sa network - Google Patents

Abstract

A synchronization method and device for a 5G relay system in an SA network are disclosed. The present embodiment provides a synchronization method and device for a 5G relay system in a standalone (SA) network, which allow a demodulation-scheme synchronization device mounted in a 5G relay to receive a 5G NR base station signal, thereby enabling a 5G service in a continuous 5G SA network structure at minimal costs with only a software upgrade on hardware of a 5G non-standalone (NSA) relay.

Description

Method and device for synchronization of 5G relay system in SA network

This work was supported by 'The Cross-Ministry Giga KOREA Project' grant funded by the Korea government (MSIT) (GK19N0300, Development of Indoor DAS Technology based on IFoF for 5G Mobile Communication)

This embodiment relates to a method and apparatus for synchronizing 5G relay systems of various structures by demodulation in a 5G NR (StandAlone) network structure of 5G NR (New Radio).

The contents described below merely provide background information related to the present embodiment, and do not constitute a prior art.

The service of 5G NR should be operated from a non-standalone (NSA) system structure interworking with LTE (4G) and ultimately a 5G NR network independent structure (Standalone) system. In order to provide 5G NR service, synchronization must be performed between a 5G base station and a UE by extracting a synchronization signal from a 5G NR single structure in a 5G relay system.

Although there is a synchronous extraction method in the NSA (Non-Standalone) network structure, the synchronous extraction method in the NSA network structure is not applicable to the SA network structure, which is a 5G NR network single structure. In other words, when performing synchronization between a base station and a terminal in a 5G relay system of an SA network structure, a synchronization method in an NSA network structure cannot be applied. Therefore, a separate synchronous extraction method that is distinct from the NSA network structure is required in the SA network structure.

In this embodiment, a demodulation-type synchronization device mounted in a 5G repeater receives a base station signal of 5G NR, and continuously upgrades 5G SA (Standalone) at a minimum cost with only software upgrade on the hardware of a 5G Non-StandAlone (NSA) repeater. ) It is an object to provide a method and apparatus for synchronizing a 5G relay system in an SA network that enables 5G service in a network structure.

According to an aspect of the present embodiment, a PBCH demodulator demodulating a master information block (MIB) to be transmitted using a physical broadcast channel (PBCH) among 5G system information included in a 5G frame received from a 5G NR base station; A SIB1 demodulator which performs SIB1 (System Information Block 1) demodulation on the MIB; A DCI demodulator driving a DCI (Data Control Information) search timer; Cell search is performed using a 5G synchronization signal included in the 5G frame to obtain a carrier frequency for the 5G frame, a subcarrier spacing, and the carrier frequency (CarrierFreqency), the An SA network comprising a subcarrier spacing (5G NR TDD switching unit) that controls TDD switching for each of the uplink (UL) and downlink (DL) of the 5G frame based on the DCI discovery timer. Provide a relay device based.

According to another aspect of this embodiment, a cell search is performed using a 5G synchronization signal included in a 5G frame received from a 5G NR base station to perform a cell search, and a carrier frequency for the 5G frame and a subcarrier space (SubcarrierSpacing) ) The process of obtaining; Demodulating a master information block (MIB) to be transmitted using a physical broadcast channel (PBCH) among 5G system information included in the 5G frame; A process of demodulating SIB1 (System Information Block 1) for the MIB; Driving a DCI (Data Control Information) search timer; And controlling TDD switching for each of the uplink (UL) and downlink (DL) of the 5G frame based on the carrier frequency (CarrierFreqency), the subcarrier space (SubcarrierSpacing), and the DCI search timer. It provides a relay method based on the SA network, characterized in that.

As described above, according to the present embodiment, a demodulation-type synchronization device mounted in a 5G repeater receives a base station signal of 5G NR, and only minimal software upgrade is required on the hardware of a 5G Non-StandAlone (NSA) repeater. It has the effect of enabling 5G service in a continuous 5G standalone (SA) network structure at a cost.

According to the present embodiment, in the SA system, a signal transmitted from an LTE (4G) network is not demodulated (demodulation), but a signal of 5G NR can be used to synchronize the base station and the terminal alone.

According to this embodiment, it is possible to dynamically respond to the TDD timing of the uplink / downlink that is dynamically changed in the SA system, and has an effect of securing significantly higher performance and stability than the existing signal strength method (RF Power Detector). have.

According to this embodiment, the 5G NR signal quality items (eg, Cell ID, SNR, RSRP, RSRQ, RSSI) can detect a synchronization signal without needing to install additional hardware using a demodulation method. Cell) It can be used as a quality measurement tool for the environment.

According to the present embodiment, a 5G NR base station and a wired connection type and a wireless connection type 5G relay system are applied to a corresponding synchronization device to improve a user data throughput connected to the 5G relay system and to improve indoor / outdoor network quality. It has the effect.

1 is a view showing a 5G relay system in the SA network structure according to the present embodiment.

2 is a diagram illustrating a wireless connection type 5G relay system in an SA network structure according to the present embodiment.

3 is a view showing a wired connection type 5G relay system in the SA network structure according to the present embodiment.

4 is a view showing a synchronization device applied to a wireless connection type 5G relay system in an SA network structure according to the present embodiment.

5 is a view showing a synchronization device applied to a wired connection type 5G relay system in an SA network structure according to the present embodiment.

6A, 6B, and 6C are flowcharts for explaining a synchronization process for 5G frames of a relay system in an SA network structure according to the present embodiment.

7 is a view showing a 5G NR SFI table according to the present embodiment.

8 is a view showing the SSB structure according to the present embodiment.

Hereinafter, this embodiment will be described in detail with reference to the accompanying drawings.

1 is a view showing a 5G relay system in the SA network structure according to the present embodiment.

The 5G relay system in the SA network structure according to the present embodiment includes a 5G NR base station 110 and a 5G relay system 120. Components included in the 5G relay system in the SA network structure are not necessarily limited thereto.

Unlike the NAS (Non-Standalone) network, which uses LTE (4G) network and 5G network as a single network using network virtualization, the SA (Standalone) network structure has a structure capable of synchronization using only a 5G NR frame. SA network structure, as shown in Figure 1, 5G relay system 120 receives and operates signals from the 5G NR base station 110 alone.

The synchronization device 210 applied to the 5G relay system 120 performs synchronization for the 5G NR network. Unlike the NSA (Non-Standalone) network structure in which control information is necessarily transmitted in LTE (4G), the SA network is capable of coping with the SA network structure of 5G NR by demodulating only 5G NR frames.

In 5G service, since the 5G relay system 120 needs to detect the uplink / downlink timing between the 5G NR base station 110 and the terminal UE, synchronization must be performed. Therefore, the 5G service based on the TDD method is suitable for various services and scenarios such as a 5G NR base station 110 and an interface structure such as a wireless connection type (RF repeater), a wired connection type (optical repeater) structure and an indoor type (in-building) outdoor type. Should be operated.

2 is a diagram illustrating a wireless connection type 5G relay system in an SA network structure according to the present embodiment.

The 5G relay system 120 according to the present embodiment may be implemented as a wireless connection type 5G relay system 200. The wireless connection type 5G relay system 200 in the SA network structure includes a synchronization device 210 according to the present embodiment. The wireless connection type 5G relay system 200 transmits and receives signals wirelessly with the 5G NR base station 110.

The radio-connected 5G relay system 200 in the SA network structure of 5G NR shown in FIG. 2 wirelessly transmits a signal to the 5G NR base station 110. The wireless connection type 5G relay system 200 receives a signal transmitted from the 5G NR base station 110 to the air using a donor antenna.

The wireless connection type 5G relay system 200 filters and amplifies the hand signal received from the 5G NR base station 110 and transmits it to the internal synchronization device 210 to respond to synchronous and uplink / downlink changes, and multiples in the inbuilding It transmits to the service antenna to provide 5G service within coverage.

The radio-connected 5G relay system 200 in the NSA network structure of 5G NR responds to synchronous and uplink / downlink changes and extends coverage by installing multiple service antennas inside the in-building.

3 is a view showing a wired connection type 5G relay system in the SA network structure according to the present embodiment.

The 5G relay system 120 according to the present embodiment may be implemented as a wired connection type 5G relay system 300. The wired connection type 5G relay system 300 in the SA network structure includes a synchronization device 210 according to the present embodiment. The wired connection type 5G relay system 300 transmits and receives signals to and from the 5G NR base station 110 through a wire (Coaxial & Optic).

The 5G NR base station 110 transmits a signal through a wired (Coaxial & Optic) to the wired connection type 5G relay system 300. The wired connection type 5G relay system 300 filters and amplifies the signal received from the 5G NR base station 110 through the wire (Coaxial & Optic) using a donor antenna and transmits it to the synchronization device 210.

Wired connection 5G repeater system 300 in SA network structure of 5G NR responds to synchronous and uplink / downlink changes and extends coverage by installing multiple remotes inside the in-building. At this time, the remote is divided into an antenna-integrated structure or an antenna-separated structure.

The synchronization device 210 included in the wireless connection type 5G relay system 200 shown in FIG. 2 and the wired connection 5G repeater system 300 shown in FIG. 3 applies the demodulation method of the signal to reduce the instability of the signal strength detection method. Overcome.

The synchronization device 210 is mounted in the 5G relay system operated between the base station and the terminal in the SA network structure of the 5G NR to accurately estimate the temporal position of the synchronization signal. The synchronization device 210 is implemented to be able to respond to the dynamic change of the uplink / downlink of the 5G frame, thereby enabling stable operation of the 5G service.

The wired connection type 5G relay system 300 includes a donor, an optical module, a remote, a filter, and an antenna block. The remote included in the wired connection type 5G relay system 300 has an antenna-integrated or separate structure. The wired connection type 5G relay system 300 transmits the 5G NR signal received from the 5G NR base station 110 to the synchronization device 210. The wired connection type 5G relay system 300 converts the signal through the synchronization process using the synchronization device 210 into a low voltage TTL (LVTTL) and transmits each to a corresponding remote via an optical cable connected to the optical module. The wired connection type 5G relay system 300 enables 5G service in the SA network by TDD switching of the donor and the remote in the same manner in response to the changing base station signal.

The synchronization device 210 is not classified according to the wired connection type 5G relay system 300 and the wireless connection type 5G relay system 200 and is implemented as a field programmable gate array (FPGA) of the same digital board. The synchronization device 210 is implemented by sharing / allocating the FPGA resource required to digitally filter and process the 5G NR signal, thereby reducing additional hardware cost.

The 5G NR signal block configuration of the synchronization device 210 is 5G NR signal, analog digital convert (ADC), fast Fourier Transform (FFT), primary synchronous signal (PSS) demodulation, secondary synchronous signal (SSS) demodulation, and PBCH (Physical) Broadcast Channel (DVI) demodulation and DCI (Downlink Control Information) demodulation are performed to extract the starting point of the 5G NR frame.

4 is a view showing a synchronization device applied to a wireless connection type 5G relay system in an SA network structure according to the present embodiment.

The synchronization device 210 applied to the wireless connection type 5G relay system 200 in the SA network structure according to the present embodiment includes an ADC unit 410, an FFT unit 420, a PSS demodulator 430, and an SSS demodulator ( 440), a PBCH demodulator 450, a SIB1 demodulator 460, a DCI demodulator 470, and a 5G NR TDD switching unit 480. The components included in the synchronization device 210 are not limited thereto.

The demodulation method of the synchronization device 210 applied to the SA network structure of 5G NR according to the present embodiment detects a synchronous signal using a 5G frame received from the 5G NR base station 110 and detects uplink / downlink The switching timing can be matched with the 5G NR base station 110.

The synchronization device 210 according to the present embodiment is applicable to all 5G relay system structures connected to each of the 5G NR base stations 110 by wired or wireless.

4, the wireless connection type 5G relay system 200 includes a donor antenna, a donor filter unit, a switching unit, a low noise amplifier (LNA), a TDD switching unit, a synchronization device 210, an RF unit, and a power amplification unit. , A service filter unit, and a service antenna.

The donor antenna is connected to the donor filter unit and transmits the 5G frame received from the 5G NR base station 110 to the donor filter unit. The donor filter unit is connected between the donor antenna and the switching unit, and filters the 5G frame received from the donor filter unit and transmits it to the switching unit. The switching unit is connected between the donor filter unit and the LNA, and performs switching on the filtered 5G frame. The LNA is connected between the switching unit and the synchronization device 210, and amplifies the 5G frame input from the switching unit with low noise and inputs it to the synchronization device 210.

The synchronization device 210 converts to a low voltage TTL (LVTTL) through an internal synchronization process for a 5G frame and transmits it to a TDD switching unit, thereby enabling service in an SA network in response to a changed base station signal. The TDD switching unit is connected between the synchronization device 210 and the switching unit, and transfers the LVTTL received from the synchronization device 210 to the switching unit.

The synchronization device 210 applied to the wireless-connected 5G relay system 200 performs Analog Digital Convert (ADC) on the 5G frame and performs Fast Fourier Transform (FFT) conversion on the ADC signal. The synchronization device 210 applied to the wireless-connected 5G relay system 200 demodulates a Primary Synchronous Signal (PSS) and a Secondary Synchronous Signal (SSS) after performing FFT conversion. The synchronization device 210 applied to the wireless connection-type 5G relay system 200 demodulates the SSS, extracts a PBCH (Physical Broadcast Channel), and extracts the starting point of the 5G NR frame using the PBCH.

The synchronization device 210 applied to the wireless connection type 5G relay system 200 performs cell search using a 5G synchronization signal (eg, PSS, SSS) included in a 5G frame received from the 5G NR base station 110. Perform to obtain a carrier frequency (CarrierFreqency), subcarrier space (SubcarrierSpacing) for the 5G frame. The 5G synchronization unit 400 controls TDD switching for each of the uplink (UL) and downlink (DL) of the 5G frame based on the carrier frequency (CarrierFreqency) and the subcarrier space (SubcarrierSpacing).

The synchronization device 210 applied to the wireless connection type 5G relay system 200 includes an ADC unit 410, an FFT unit 420, a PSS demodulator 430, an SSS demodulator 440, a PBCH demodulator 450, and SIB1. It includes a demodulator 460, a DCI demodulator 470, and a 5G NR TDD switching unit 480.

The components included in the synchronization device 210 applied to the wireless connection type 5G relay system 200 are not necessarily limited thereto.

Each component included in the synchronization device 210 applied to the wireless connection type 5G relay system 200 is connected to a communication path connecting a software module or a hardware module inside the device to operate organically with each other. These components communicate using one or more communication buses or signal lines.

Each component of the synchronization device 210 applied to the wireless connection type 5G relay system 200 shown in FIG. 4 refers to a unit that processes at least one function or operation, and is a software module, a hardware module, or software and hardware. It can be implemented as a combination of.

The ADC unit 410 performs Analog Digital Convert (ADC) on 5G frames received from the 5G NR base station 110. The FFT unit 420 performs Fast Fourier Transform (FFT) transformation on the signal from the ADC unit 410 for performing the ADC.

The PSS demodulator 430 demodulates a PSS (Primary Synchronous Signal) to a signal that has undergone FFT conversion received from the FFT unit 420. The SSS demodulator 440 demodulates a Secondary Synchronous Signal (SSS) with respect to the signal demodulated PSS received from the PSS demodulator 430.

The PBCH demodulator 450 demodulates a Master Information Block (MIB) to be transmitted using a PBCH (Physical Broadcast Channel) among 5G system information included in a 5G frame received from the 5G NR base station 110. The PBCH demodulator 450 extracts the PBCH to transmit the MIB. The PBCH demodulator 450 extracts the starting point of the 5G NR frame using the PBCH.

The SIB1 demodulator 460 performs SIB1 (System Information Block 1) demodulation on the MIB. The SIB1 demodulator 460 performs PDCCH Search Space Blinding Detection (PDCCH) for 5G frames. The SIB1 demodulator 460 searches a common search space (CSS) for a Physical Downlink Control Channel (PDCCH) for decoding by extracting and decoding System Information Block 1 (SIB1) for 5G frames. The SIB1 demodulator 460 extracts the Type0 PDCCH for the CORESET search, which is a control resource set for CSS, and demodulates the SIB1 for the Type0 PDCCH.

The DCI demodulator 470 drives a DCI (Data Control Information) search timer.

The DCI demodulator 470 is a cell-specific downlink (DL) or uplink (UL) pattern (TDD-UL-DL-Pattern) among semi-static data of a signal demodulated SIB1 To extract. The DCI demodulator 470 extracts a TDD downlink and uplink pattern period (DL-UL-TransmissionPeriodicity) based on a cell-specific downlink and uplink pattern (TDD-UL-DL-Pattern). The DCI demodulator 470 drives a DCI (Data Control Information) search timer for configuring a dynamic Short EF Identifier (SFI).

The 5G NR TDD switching unit 480 performs a cell search using a 5G synchronization signal included in a 5G frame to obtain a carrier frequency and a subcarrier space for the 5G frame. The 5G NR TDD switching unit 480 controls TDD switching for each of the uplink (UL) and downlink (DL) of the 5G frame based on the carrier frequency, subcarrier spacing, and DCI search timer. .

The 5G NR TDD switching unit 480 waits until the TDD downlink and uplink pattern period (DL-UL-TransmissionPeriodicity) arrives, and then the cell radio network temporary identifier C-RNTI (Cell) from the 5G NR base station 110 Radio RNTI (Radio Network Temporary Identifier) is received.

The 5G NR TDD switching unit 480 receives a Radio Resource Control (RRC) connection reconfiguration message (RRCConnectionReconfiguration Message) from the 5G NR base station 110 corresponding to C-RNTI. The 5G NR TDD switching unit 480 is a UE-specific search space USS (UE-) for decoding a UE-specific PDCCH Search Space, which is a UE-specific Physical Downlink Control Channel (PDCCH) search space, from a 5G frame based on an RCC connection reset message. specific search space).

The 5G NR TDD switching unit 480 extracts a UE specific PDCCH, which is a UE specific PDCCH for CORESET search, which is a set of control resources, from a UE specific search space (USS). The 5G NR TDD switching unit 480 demodulates the USS, which is the UE specific search space, based on the UE Specific PDCCH, which is the UE specific PDCCH.

The 5G NR TDD switching unit 480 extracts a common, dedicated uplink (Dedicated UL), and dedicated downlink (Dedicated DL) slot configuration (TDD-UL-DL-SlotConfig) from the demodulated USS signal. The 5G NR TDD switching unit 480 extracts a slot index based on dedicated uplink (Dedicated UL) and dedicated downlink (Dedicated DL) slot configuration (TDD-UL-DL-SlotConfig) information. The 5G NR TDD switching unit 480 checks the position of the Short EF Identifier (SFI) table corresponding to the slot index.

The 5G NR TDD switching unit 480 checks whether or not predetermined rules are overwritten. The 5G NR TDD switching unit 480 specifies the UE among semi-static data of a signal in which the preset rules are overwritten when the preset rules are overwritten. Downlink (DL), uplink (UL), and slot configuration are reflected for each slot index based on (UE-Specific). The 5G NR TDD switching unit 480 controls 5G NR TDD switching based on the DCI search timer when the preset rules are not overwritten.

The 5G NR TDD switching unit 480 transmits the 5G NR base station 110 to the 5G frame based on the carrier frequency, SSB (Synchronization Signal Block), and subcarrier spacing for the 5G frame pre-stored in the system configuration buffer. Search for synchronous raster position.

The 5G NR TDD switching unit 480 detects a subcarrier using a 5G synchronization signal, a PSS (Primary Synchronous Signal), centering on the location of a synchronization raster in the frequency domain.

After demodulating the PSS, the 5G NR TDD switching unit 480 extracts a plurality of cell ID groups (N ⁽²⁾ _IDs ) (for example, three) by analyzing a correlation for the PSS. do.

The 5G NR TDD switching unit 480 transmits a 5G synchronization signal (Secondary Synchronous Signal), which is a 5G synchronization signal, based on a (i + 2) ^th symbol position for a cell ID group (N ⁽²⁾ _ID ) and a synchronization raster position in a frequency domain. Subcarrier is detected by using and is generated as a bipolar signal (d` _sss (n)).

The 5G NR TDD switching unit 480 has a plurality of bipolar signals (d (0), d (1), d) from the pre-stored SSS sequence calculation table according to the PSS correlation value in the cell ID group (N ⁽²⁾ _ID ). (2)).

5G NR TDD switching unit 480 is a plurality of bipolar signals (d (0), d (1), d (2)), SSS, cell ID sector based on the largest value of the correlation value for the SSS (Cell ID Sector) (N ⁽¹⁾ _ID ).

The 5G NR TDD switching unit 480 synchronizes the symbols based on the cell ID group (N ⁽²⁾ _ID ) and the cell ID sector (N ⁽¹⁾ _ID ) and obtains the 5G cell ID and stores it in the system configuration buffer.

The 5G NR TDD switching unit 480 calculates the position on the frequency domain in the SS / PBCH block for the 5G frame pre-stored in the system configuration buffer. The 5G NR TDD switching unit 480 detects a plurality of subcarriers based on a synchronization raster position in a plurality of symbol positions and frequency domains. The 5G NR TDD switching unit 480 derives the number (Lmax) of PBCHs according to the carrier frequency. The 5G NR TDD switching unit 480 decodes a DeModulation Reference Signal (DMRS) in the SSB. The 5G NR TDD switching unit 480 demodulates the PBCH having gold-sequence by DMRS.

The 5G NR TDD switching unit 480 extracts the SSB index and half frame number from the DMRS and stores them in a system configuration buffer.

The 5G NR TDD switching unit 480 derives a number of slots in a subframe and a symbol index using a carrier frequency and a carrier space for a 5G frame. do.

The 5G NR TDD switching unit 480 includes a number of subframes in a radio frame, a number of symbols in slot, a subcarrier spacing, and a number of slots in the subframe ( 5G NR synchronization table is constructed by using the number of slots in subframe and the half frame number derived by the decoded PBCH-DMRS and the SSB index.

The 5G NR TDD switching unit 480 has a half frame number, a SSB index, and a symbol index for each remaining number of symbols in frame up to the next System Frame Number (SFN). 5G NR by matching at least one of (Symbol index), Subframe number, Remaining number of symbols in slot, and Remaining number of slots in subframe. Construct a synchronous table.

5G NR TDD switching unit 480, the slot number of the SSB (Slot Number) is a symbol index (Symbol Index), the number of symbols in the ^slot (N ^slot _symb ), the number of subframes in the frame (N ^fame _subframe ), the slot in the _subframe It is calculated based on the number (N ^subframe _slot ) and the half frame number (Half Frame Number).

The 5G NR TDD switching unit 480 calculates the subframe number of the SSB based on the slot number.

5G NR TDD switching unit 480 is based on the number of symbols in the slot (N ^slot _symb ), the symbol index mode (Symbol Index Mod N ^slot _symb ) of the number of symbols in the slot, remaining in the slot until the next SFN (System Frame Number) Calculate the number of symbols (Remaining Number of symbols).

The 5G NR TDD switching unit 480 calculates the remaining number of slots in a subframe up to the next System Frame Number (SFN) based on the slot number mod.

5G NR TDD switching unit 480 is the frame number of the sub-frame (N ^frame _subframe) and a subframe number (Subframe Number-1) number of remaining subframes within the frame of the next SFN (System Frame Number) is based on (Remaining Number of subframes in frame).

5G NR TDD switching unit 480, the number of remaining symbols in the slot (Remaining Number of Symbols in Slot), the number of remaining slots in the subframe (Remaining Number of Slots in Subframe), the number of symbols in the ^slot (N ^slot _symb ), within the frame Remaining Number of Subframes in Frame, N ^subframe _slots , and the number of remaining symbols in a frame up to the next System Frame Number (SFN) based on the number of N ^slot _symbs . Calculate (Remaining Number of Symbols in Frame).

5 is a view showing a synchronization device applied to a wired connection type 5G relay system in an SA network structure according to the present embodiment.

The wired connection type 5G relay system 300 according to the present embodiment includes a donor unit, a synchronization device 210, a donor optic unit, a remote optic unit, a remote unit, and a filter unit. The donor unit is connected to the synchronization device 210, and transmits the 5G frame received through the wire from the 5G NR base station 110 to the synchronization device 210.

The synchronization device 210 converts to a Low Voltage TTL (LVTTL) through an internal synchronization process for a 5G frame and transmits it to a donor optical unit, so it can be serviced in a SA network in response to a changed base station signal. The remote is composed of an antenna-integrated or separate structure. The donor optic unit transmits to each of the corresponding remote optic units through a connected optical cable.

The synchronization device 210 according to the present exemplary embodiment can be implemented by utilizing the FPGA of the digital board in the same way as the wireless connection type 5G relay system 200 and the wired connection type 5G relay system 300. The synchronization device 210 implements by sharing and allocating Field Programmable Gate Array (FPGA) resources required for digital filtering and processing of 5G frames, thereby reducing additional hardware cost.

The 5G NR signal block configuration of the synchronization device 210 is 5G NR signal, analog digital convert (ADC), fast Fourier Transform (FFT), primary synchronous signal (PSS) demodulation, secondary synchronous signal (SSS) demodulation, and PBCH (Physical) Broadcast Channel) demodulation and DCI (Downlink Control Information) demodulation to extract the starting point of the 5G NR frame.

6A, 6B, and 6C are flowcharts for explaining a synchronization process for 5G frames of a relay system in an SA network structure according to the present embodiment.

The synchronization device 210 in the 5G relay system 120 turns on the power of the repeater module (S610).

The synchronization device 210 in the 5G relay system 120 clears the system configuration buffer (S612). In step S612, the synchronization device 210 in the 5G relay system 120 clears the buffer in which information about the shape, sequence, and short EF identifier (SFI) is temporarily stored.

The synchronization device 210 in the 5G relay system 120 selects a 5G NR base station (gNB) 110 based on beam measurement and optimal beam (S614). In step S614, the synchronization device 210 in the 5G relay system 120 selects an optimal signal based on a beam emitted from the 5G NR base station 110.

The synchronization device 210 in the 5G relay system 120 receives a 5G NR base station signal from the selected 5G NR base station 110. The synchronization device 210 in the 5G relay system 120 includes system shape information (frequency (Carrier Frequency), SSB (Synchronization Signal Block), subcarrier space) of the 5G NR base station 110 pre-stored in the system (shape) configuration buffer. Subcarrier Spacing)) to search for a synchronous raster location of the base station.

The synchronization device 210 in the 5G relay system 120 detects 127 subcarriers using a 5G synchronization signal, a PSS (Primary Synchronous Signal), centering on the position of the synchronization raster in the frequency domain. The synchronization device 210 in the 5G relay system 120 demodulates the detected PSS and generates 127 m-sequences. The synchronization device 210 in the 5G relay system 120 demodulates the PSS and analyzes the correlation for the PSS, thereby generating a plurality of cell ID groups (N ⁽²⁾ _IDs ). 3) Extract (S616).

In step S616, the synchronization device 210 in the 5G relay system 120 demodulates the PSS from the optimal signal and analyzes correlation. The synchronization device 210 in the 5G relay system 120 demodulates the PSS and analyzes the correlation for the PSS, thereby generating a plurality of cell ID groups (N ⁽²⁾ _IDs ). Three (0 ~ 2)) are extracted.

The synchronization device 210 in the 5G relay system 120 is a 5G synchronization signal SSS (Secondary) centering on the (i + 2) ^th symbol position for the cell ID group (N ⁽²⁾ _ID ) and the synchronization raster position in the frequency domain. A subcarrier is detected using a synchronous signal, and is generated as a bipolar signal.

The synchronization device 210 in the 5G relay system 120 generates a plurality of bipolar signals from the pre-stored SSS sequence calculation table according to the PSS correlation value in the cell ID group (N ⁽²⁾ _ID ).

The synchronization device 210 in the 5G relay system 120 extracts a Cell ID Sector (N ⁽¹⁾ _ID ) based on the largest value among correlation values for a plurality of bipolar signals, SSS, and SSS. (S618).

In step S618, the synchronization device 210 in the 5G relay system 120 extracts a cell ID group (N ⁽²⁾ _ID ), demodulates the SSS, and analyzes correlation to analyze the cell ID. After extracting a sector (Cell ID Sector), a cell ID is obtained. The synchronization device 210 in the 5G relay system 120 can extract 336 SSSs (0 to 335) and check for 1008 cell IDs.

The synchronization device 210 in the 5G relay system 120 synchronizes the symbols based on the cell ID group (N ⁽²⁾ _ID ) and the cell ID sector (N ⁽¹⁾ _ID ) and acquires the 5G cell ID to buffer the system configuration. To save.

The synchronization device 210 in the 5G relay system 120 calculates the position on the frequency domain in the SS / PBCH block for 5G frames previously stored in the system configuration buffer. The synchronization device 210 in the 5G relay system 120 detects a plurality of subcarriers around a plurality of symbol positions and a synchronization raster position in a frequency domain. The synchronization device 210 in the 5G relay system 120 derives the number (Lmax) of PBCHs according to the carrier frequency. The synchronization device 210 in the 5G relay system 120 decodes the DeModulation Reference Signal (DMRS) in the SSB (S620).

The synchronization device 210 in the 5G relay system 120 demodulates a physical broadcast channel (PBCH) having a gold-sequence in DMRS (S622).

The synchronization device 210 in the 5G relay system 120 extracts the SSB index and half frame number from the DMRS and stores them in the system configuration buffer.

The synchronization device 210 in the 5G relay system 120 demodulates a master information block (MIB) to be transmitted using a physical broadcast channel (PBCH) among 5G system information included in the 5G frame (S624).

In step S624, the synchronization device 210 in the 5G relay system 120 acquires Master Information Block (MIB) information using the PBCH. MIB means essential information of System Information (SI), and includes downlink bandwidth, System Frame Number (SFN), HARQ, and channel information for the UE to access the 5G NR base station 110. The synchronization device 210 in the 5G relay system 120 performs 5G frame synchronization (frame start point position) (S626).

In step S626, since the UE provides downlink bandwidth for accessing the 5G NR base station 110, System Frame Number (SFN), HARQ, and channel information, the synchronization device 210 synchronizes the frame with the 5G NR base station 110. Is possible.

The synchronization device 210 in the 5G relay system 120 performs a Physical Downlink Control Channel (PDCCH) blind detection (PDCCH Search Space Blinding Detection) for the 5G frame (S628).

The synchronization device 210 in the 5G relay system 120 searches the common search space (CSS) for the PDCCH to extract and decode SIB1 for the 5G frame (S630). In step S630, the synchronization device 210 demodulates a System Information Block (SIB1) by extracting a Physical Downlink Control Channel (PDCCH) for CORESET search. The synchronization device 210 in the 5G relay system 120 extracts a Type0 PDCCH for CORESET search, which is a set of control resources for CSS (Common Search Space) (S632).

The synchronization device 210 in the 5G relay system 120 demodulates System Information Block1 (SIB1) for the Type0 PDCCH (S634). In step S634, the synchronization device 210 in the 5G relay system 120 extracts Physical Downlink Control Channel (PDCCH) for CORESET search, which is a control resource set after frame synchronization of 5G NR after S626, and extracts SIB1 (System Information Block1). Demodulate.

The synchronization device 210 in the 5G relay system 120 is a cell-specific downlink (DL) or uplink (UL) pattern (TDD-) among semi-static data of a signal demodulating SIB1. UL-DL-Pattern) is extracted (S636).

The synchronization device 210 in the 5G relay system 120 is a TDD downlink (DL) based on a cell-specific downlink (DL) and an uplink (UL) pattern (TDD-UL-DL-Pattern). , The uplink (UL) pattern period (DL-UL-TransmissionPeriodicity) is extracted (S638).

The synchronization device 210 in the 5G relay system 120 drives a DCI (Data Control Information) discovery timer for configuring a dynamic Short EF Identifier (SFI) (S640). The synchronization device 210 in the 5G relay system 120 controls 5G NR TDD switching based on the DCI search timer (S642).

The synchronization device 210 in the 5G relay system 120 performs up / down link transmission / reception switching based on the TDD downlink (DL) and uplink (UL) pattern period (DL-UL-TransmissionPeriodicity) extracted in step S638. 110). In step S644, the synchronization device 210 in the 5G relay system 120 extracts the DL / UL pattern in S636 to control TDD switching of the 5G NR and synchronize with the base station and the terminal.

The 5G NR base station 110 receives the TDD downlink (DL) and uplink (UL) pattern period (DL-UL-TransmissionPeriodicity) from the synchronization device 210 in the 5G relay system 120. 5G NR base station 110 performs synchronization to match the timing of the uplink and user equipment (UE) (S646).

The 5G NR base station 110 starts up / down transmission / reception in a TDD downlink (DL) and uplink (UL) pattern period (DL-UL-TransmissionPeriodicity) for each user equipment (UE), slot, and symbol (S648). The 5G NR base station 110 waits until the TDD downlink (DL) and uplink (UL) pattern period (DL-UL-TransmissionPeriodicity) arrives (S650).

The synchronization device 210 in the 5G relay system 120 receives the cell radio network temporary identifier C-RNTI (Cell Radio Radio Network Temporary Identifier) (C-RNTI) from the 5G NR base station 110 (S652). The synchronization device 210 in the 5G relay system 120 receives an RRCConnectionReconfiguration message (Radio Resource Control (RRC) connection reset message) from the 5G NR base station 110 (S654).

The synchronization device 210 in the 5G relay system 120 is a UE-specific search space (USS), a UE-specific search space for decoding a UE-specific PDCCH Search Space, which is a UE-specific Physical Downlink Control Channel (PDCCH) search space from a 5G frame. ) (S656).

In step S656, the synchronization device 210 in the 5G relay system 120 acquires a cell radio network temporary identifier C-RNTI and receives an RRCConnectionReconfiguration message from the 5G NR base station 110 to search for a UE-specific search space (USS). And demodulate to extract the UL / DL slot configuration.

The synchronization device 210 in the 5G relay system 120 extracts the UE specific PDCCH, which is the UE specific PDCCH for the CORESET search, which is the control resource set, from the UE specific search space (USS) included in the 5G frame (S658).

The synchronization device 210 in the 5G relay system 120 demodulates the UE-specific discovery space USS based on the UE-specific PDCCH, the UE-specific PDCCH (S660). Synchronization device 210 in the 5G relay system 120 is a common (Common), dedicated uplink (Dedicated UL), dedicated downlink (Dedicated DL) slot configuration from the signal demodulated USS (TDD-UL-DL-SlotConfig) Extract the (S662).

The synchronization device 210 in the 5G relay system 120 extracts the slot index based on dedicated uplink and downlink slot configuration (TDD-UL-DL-SlotConfig) information and checks the location of the Short EF Identifier (SFI) table. (S664).

The synchronization device 210 in the 5G relay system 120 checks whether or not predetermined rules are overwritten (S666). As a result of the check in step S666, when the preset rules are overwritten, the synchronization device 210 in the 5G relay system 120 half of the signal in which the preset rules are overwritten. Downlink (DL), uplink (UL), and slot configurations are reflected for each slot index based on UE-specificity among semi-static data (S668). The synchronization device 210 in the 5G relay system 120 returns to step S642 after performing step S668.

In step S668, if the synchronization device 210 in the 5G relay system 120 checks the SFI (Slot Format Indicator) table position and complies with the overwriting rules, the UE-specific / Semi-static based slot index It reflects DL / UL configuration. The synchronization device 210 in the 5G relay system 120 moves to S642 after step S668 and continuously repeats to respond to the 5G NR signal changing in real time.

As a result of checking in step S666, when the preset rules are not overwritten, the synchronization device 210 in the 5G relay system 120 returns to step S650. In other words, the synchronization device 210 in the 5G relay system 120 repeatedly repeats the procedure from the point in time corresponding to step S650 if the overwriting rules are not observed.

Although FIGS. 6A, B and C are described as sequentially executing steps S610 to S668, the present invention is not limited thereto. In other words, since the steps described in FIGS. 6A, B, and C may be applied by changing or executing one or more steps in parallel, FIGS. 6A, B, and C are not limited to the time series.

As described above, in the SA network structure according to the present embodiment described in FIGS. 6A, B and C, a synchronization process for a 5G frame of a relay system may be implemented as a program and recorded in a computer-readable recording medium. In the SA network structure according to the present embodiment, a program for implementing a synchronization process for a 5G frame of a relay system is recorded, and a computer-readable recording medium stores all kinds of recording devices that store data that can be read by a computer system. It includes.

7 is a view showing a 5G NR SFI table according to the present embodiment.

7 is a 5G NR SFI (Slot Format Indicator) table pre-stored in the synchronization device 210. As shown in FIG. 7, the 5G NR SFI table consists of the final 256. The synchronization device 210 performs DL (DownLink) / UL (UpLink) using the 5G NR SFI table.

8 is a view showing the SSB structure according to the present embodiment.

The Synchronization Signal Block (SSB) is composed of a PSS (Primary Synchronous Signal), a SSS (Secondary Synchronous Signal), and a PBCH (Physical Broadcast CHannel). The SSB is located on four orthogonal frequency division multiplexing (OFDM) symbols on the time axis. SSB has an area of 20 resource blocks (RBs) on a frequency axis and is composed of 240 subcarriers.

PSS detects in SSBs of 16 located in the frame (PSS location of SSB is defined based on the symbol of 5G NR frame as defined in the standard) and analyzes correlation and m-sequence. ) To generate 127 sequences and compare with predefined values for final extraction.

SSS is also detected from 16 SSBs, and correlation is analyzed for final extraction. After that, the PBCH can be demodulated by using a demodulation-reference signal (DM-RS) between PBCHs to check the half frame number, so that an accurate frame start point of 5G NR can be known. (For example, condition FR1: frequency 6 GHz or less, Subcarrier Spacing: 30 kHz)

Through the above-described process, TDD switching synchronization for uplink / downlink change of 5G NR is possible, and a terminal connected to a 5G NR base station and a relay system (synchronization with a UE is completed, and 5G service of a 5G relay system in a standalone (SA) network concept Becomes possible.

The configuration of the synchronization device 210 can be manufactured separately from the digital board, but the integration and configuration of the digital board becomes an economical system than the separation of the synchronization device 210. In the case of a 5G relay system of a wired connection type device, the location of the synchronization device 210 is configured only in a donor, and it is effective from an economical point of view to transmit a synchronization signal to a remote.

The above description is merely illustrative of the technical idea of the present embodiment, and those skilled in the art to which this embodiment belongs may be capable of various modifications and variations without departing from the essential characteristics of the present embodiment. Therefore, the present embodiments are not intended to limit the technical spirit of the present embodiment, but to explain, and the scope of the technical spirit of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be interpreted by the claims below, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present embodiment.

110: 5G NR base station 120: 5G relay system

200: 5G relay system with wireless connection

210: synchronization device

300: 5G relay system with wired connection

410: ADC unit 420: FFT unit

430: PSS demodulator 440: SSS demodulator

450: PBCH demodulator 460: SIB1 demodulator

470: DCI demodulation unit 480: 5G NR TDD switching unit

CROSS-REFERENCE TO RELATED APPLICATION

If this patent application claims priority in accordance with U.S. Patent Act 119 (a) (35 USC § 119 (a)) with respect to Korean Patent Application No. 10-2018-0134922 filed in Korea on November 6, 2018, All of the contents are incorporated into this patent application as a reference. In addition, if this patent application claims priority to countries other than the United States for the same reason as above, all the contents are incorporated into this patent application as a reference.

Claims (19)

1. A PBCH demodulator demodulating a master information block (MIB) to be transmitted using a physical broadcast channel (PBCH) among 5G system information included in a 5G frame received from a 5G NR base station;

   A SIB1 demodulator which performs SIB1 (System Information Block 1) demodulation on the MIB;

   A DCI demodulator driving a DCI (Data Control Information) search timer;

   A cell search is performed using a 5G synchronization signal included in the 5G frame to obtain a carrier frequency for the 5G frame, a subcarrier spacing, and the carrier frequency (CarrierFreqency), the 5G NR TDD switching unit for controlling TDD switching for each of the uplink (UL) and downlink (DL) of the 5G frame based on the subcarrier spacing and the DCI search timer

   SA network-based relay device comprising a.
2. According to claim 1,

   The SIB1 demodulator,

   The PDCCH (Physical Downlink Control Channel) blind detection (PDCCH Search Space Blinding Detection) for the 5G frame, the PDCCH (Physical Downlink Control Channel) for extracting and decoding the System Information Block 1 (SIB1) for the 5G frame ) For searching for a common search space (CSS), extracting a Type0 PDCCH for a CORESET search, which is a set of control resources for the CSS, and demodulating the SIB1 for the Type0 PDCCH. .
3. According to claim 2,

   The DCI demodulator,

   Cell-specific downlink (DL) and uplink (UL) patterns (TDD-UL-DL-Pattern) are extracted from the semi-static data of the demodulated signal of the SIB1, and the cells TDD downlink and uplink pattern period (DL-UL-TransmissionPeriodicity) are extracted based on a specific downlink and uplink pattern (TDD-UL-DL-Pattern), and the dynamic (Short EF Identifier) SFI SA network-based relay device, characterized in that for driving the DCI (Data Control Information) search timer.
4. The method of claim 3,

   The 5G NR TDD switching unit,

   After waiting until the TDD downlink and uplink pattern period (DL-UL-TransmissionPeriodicity) arrives, the cell radio network temporary identifier C-RNTI (Cell Radio Radio Network Temporary Identifier) (C-RNTI) is received from the 5G NR base station. SA network-based relay device, characterized in that for receiving.
5. The method of claim 4,

   The 5G NR TDD switching unit,

   A Radio Resource Control (RRC) connection reconfiguration message (RRCConnectionReconfiguration Message) is received from the 5G NR base station corresponding to the C-RNTI, and a UE-specific Physical Downlink Control Channel (PDCCH) from the 5G frame based on the RCC connection reconfiguration message SA network-based relay device characterized in that it searches for a UE-specific search space (USS), which is a UE-specific search space for decoding a UE-Specific PDCCH Search Space, which is a search space.
6. The method of claim 5,

   The 5G NR TDD switching unit,

   SA network-based relay, characterized in that the UE-specific PDCCH, which is a UE-specific PDCCH for the CORESET search, which is a control resource set, is extracted from the USS, and the UE-specific discovery space, USS, is demodulated based on the UE-specific PDCCH, the UE-specific PDCCH Device.
7. The method of claim 6,

   The 5G NR TDD switching unit,

   The common, dedicated uplink (Dedicated UL), and dedicated downlink (Dedicated DL) slot configuration (TDD-UL-DL-SlotConfig) is extracted from the demodulated signal of the USS, and the dedicated uplink (Dedicated UL) , Dedicated DL (Dedicated DL) slot configuration based on (TDD-UL-DL-SlotConfig) information, extracting a slot index, characterized in that to check the SFI (Short EF Identifier) table position corresponding to the slot index SA network based relay device.
8. The method of claim 7,

   The 5G NR TDD switching unit,

   It is checked whether or not the preset rules are overwritten, and when the preset rules are overwritten, half of the signal in which the preset rules are overwritten. Downlink (DL), uplink (UL), and slot configuration are reflected for each slot index based on UE-specificity among semi-static data, and preset rules are overwritten. ), The 5G NR TDD switching is controlled based on the DCI search timer.
9. According to claim 1,

   The 5G NR TDD switching unit,

   Search for a synchronous raster position for the 5G NR base station based on a carrier frequency, a synchronization signal block (SSB), and a subcarrier spacing for the 5G frame pre-stored in a system configuration buffer,

   A subcarrier is detected by using the 5G synchronization signal, a PSS (Primary Synchronous Signal) based on the position of the synchronization raster in the frequency domain,

   After demodulating the PSS, a plurality of Cell ID Groups (N ⁽²⁾ _IDs ) are extracted by analyzing a correlation for the PSS,

   A subcarrier using the 5G synchronization signal Secondary Synchronous Signal (SSS) based on the (i + 2) ^th symbol position for the cell ID group (N ⁽²⁾ _ID ) and the synchronization raster position in the frequency domain Subcarrier) is detected, and a bipolar signal is generated,

   Generating a plurality of bipolar signals from a pre-stored SSS sequence calculation table according to the PSS correlation value in the cell ID group (N ⁽²⁾ _ID ),

   Cell ID Sector (N ⁽¹⁾ _ID ) is extracted based on the plurality of bipolar signals, the SSS, and the largest correlation value for the SSS,

   Based on the cell ID group (N ⁽²⁾ _ID ) and the cell ID sector (N ⁽¹⁾ _ID ), a symbol is synchronized, and a 5G cell ID is obtained and stored in a system configuration buffer. Relay device.
10. The method of claim 9,

    The 5G NR TDD switching unit,

    Calculate a position on the frequency domain in the SS / PBCH block for the 5G frame pre-stored in a system configuration buffer, detect a plurality of subcarriers based on a plurality of symbol positions and a synchronization raster position in the frequency domain, Deriving the number (Lmax) of the PBCH according to the carrier frequency (Carrier Frequency), decoding the DeModulation Reference Signal (DMRS) in the SSB, demodulating the PBCH having a gold-sequence (Gold-Sequence) to the DMRS, the SA network-based relay device characterized by extracting SSB index and half frame number from DMRS and storing them in a system configuration buffer.
11. The method of claim 10,

    The 5G NR TDD switching unit,

    A number of slots in a subframe and a symbol index are derived by using a carrier frequency and a subcarrier spacing for the 5G frame,

    Number of subframes in the 5G frame (Number of subframes in radio frame), Number of symbols in slot (Number of symbols in slot), Subframe space (Subcarrier spacing), Number of slots in Subframe (Number of slots in subframe) and decoding SA network-based relay device comprising a 5G NR synchronization table using a half frame number and SSB index derived by PBCH-DMRS.
12. The method of claim 11,

    The 5G NR TDD switching unit,

    Half frame number, SSB index, symbol index, and number of subframes per Remaining number of symbols in frame until the next System Frame Number (SFN) Characterized in that the 5G NR synchronization table is configured by matching at least one of a subframe number, a remaining number of symbols in slot, and a remaining number of slots in a subframe. SA network-based relay device.
13. The method of claim 11,

    The 5G NR TDD switching unit,

    The number of slots (Slot Number) of the SSB is a symbol index, a number of symbols in a slot (N ^slot _symb ), a number of subframes in a frame (N ^fame _subframe ), a number of slots in a ^subframe (N ^subframe _slot ), a half SA network-based relay device, characterized in that it is calculated based on the number of frames (Half Frame Number).
14. The method of claim 11,

    The 5G NR TDD switching unit,

    The subframe number (Subframe Number) of the SSB is calculated based on the number of slots (Slot Number) SA network-based relay device.
15. The method of claim 11,

    The 5G NR TDD switching unit,

    Remaining Number of symbols in the slot until the next System Frame Number (SFN) based on the number of symbols in the ^slot (N ^slot _symb ) and the symbol index mode of the number of symbols in the ^slot (Symbol Index Mod N ^slot _symb ) slot), characterized in that the SA network-based relay device.
16. The method of claim 11,

    The 5G NR TDD switching unit,

    SA network-based relay device, characterized in that the remaining number of slots (Remaining Number of slots in subframe) up to the next System Frame Number (SFN) based on the slot number mode (Slot Number mod) is calculated.
17. The method of claim 11,

    The 5G NR TDD switching unit,

    Frame to calculate the sub-frames (N ^frame _subframe) and a subframe number (Subframe Number-1) number of the remaining subframes within the frame of the next SFN (System Frame Number) is based on (Remaining Number of subframes in frame) Features SA network based relay device.
18. The method of claim 11,

    The 5G NR TDD switching unit,

    Remaining Number of Symbols in Slot, Remaining Number of Slots in Subframe, N ^slot _symb , Remaining Number of Frames Remaining Number of Symbols in Frame up to the next System Frame Number (SFN) based on Subframes in Frame, N ^subframe _slots , and N ^slot _symbs SA network-based relay device, characterized in that for calculating.
19. Performing a cell search using a 5G synchronization signal included in a 5G frame received from a 5G NR base station to obtain a carrier frequency and subcarrier spacing for the 5G frame;

    Demodulating a master information block (MIB) to be transmitted using a physical broadcast channel (PBCH) among 5G system information included in the 5G frame;

    A process of demodulating SIB1 (System Information Block 1) for the MIB;

    Driving a DCI (Data Control Information) search timer; And

    A process of controlling TDD switching for each of the uplink (UL) and downlink (DL) of the 5G frame based on the carrier frequency (CarrierFreqency), the subcarrier space (SubcarrierSpacing), and the DCI discovery timer

    SA network based relaying method comprising a.

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