TW202031082A - Operating method of terminal in wireless communication system and terminal for performing communication - Google Patents

Abstract

An operating method of a terminal in a wireless communication system including a cell and the terminal includes receiving an external signal including a synchronization signal block (SSB) from the cell, the SSB including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), obtaining a cell identification number of the cell using the PSS and the SSS, determining a plurality of decoding priorities of a plurality of candidate indexes of the SSB, and performing decoding on the PBCH based on the plurality of decoding priorities.

Description

Operation method of terminal in wireless communication system and terminal for performing communication

The concept of the present invention relates to a terminal and an operating method for quickly performing cell search in a wireless communication system. [Cross reference of related applications]

This application claims the rights and interests of Korean patent applications No. 10-2018-0150085 and No. 10-2019-0040295 filed at the Korea Intellectual Property Office on November 28, 2018 and April 5, 2019, respectively. The disclosed contents of the Korean patent application are all incorporated into this application for reference.

Recently, a fifth-generation (fifth-generation, 5G) (or new radio (NR)) communication system has been developed, which is compared with traditional long-term evolution (LTE) or advanced long-term evolution. Technology (LTE-advanced, LTE-A) (for example, with a bandwidth of 100 megahertz (MHz) or greater than 100 megahertz), the fifth-generation wireless (5G) (or new radio (NR)) communication The system uses ultra-wide bands to provide high-speed data services of billions of bits per second (Gbps). However, it is difficult to ensure an ultra-wide band frequency of 100 megahertz or greater than 100 megahertz in a frequency band of hundreds of megahertz or billions of hertz (GHz) (for example, application The ultra-wideband frequency of LTE and LTE-A), therefore, a 5G communication system that uses a broadband corresponding to a frequency band of 6 gigahertz or greater than 6 gigahertz to transmit signals has been considered. In detail, in 5G communication systems, millimeter wave frequency bands such as the 28 gigahertz frequency band or the 60 gigahertz frequency band can be used to increase the data transmission rate.

A 5G communication system using beamforming technology has been considered. Beamforming technology is used to generate directional beams using multiple antennas to increase the radio wave transmission range. The beamforming technology can be applied to transmission devices (for example, cells or base stations) and receiving devices (for example, terminals). Since the physical beam is concentrated in the target direction, beamforming technology will increase the service area and reduce interference.

Since beamforming technology is applied in the 5G communication system to transmit or receive signals for cell search, it is desirable to provide a technology for achieving rapid cell search in the 5G communication system.

The concept of the present invention provides a terminal and an operating method thereof. The terminal and an operating method thereof can reduce undesired operations (for example, excessive decoding operations) during a cell search process performed by the terminal in a 5G communication system, and thus perform fast Cell search.

According to an aspect of the concept of the present invention, there is provided an operating method of a terminal in a wireless communication system, the wireless communication system including a cell and the terminal, and the operating method includes: receiving a synchronization signal block (SSB) from the cell The synchronization signal block includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a physical broadcast channel (PBCH); the primary synchronization signal and the secondary synchronization signal are used to obtain the cell of the cell Identification number; determining multiple decoding priorities of multiple candidate indexes of the synchronization signal block; and performing decoding on the physical broadcast channel based on the multiple decoding priorities.

According to an aspect of the concept of the present invention, there is provided an operating method of a terminal in a wireless communication system, the wireless communication system including a cell and the terminal, and the operating method includes: selecting transmission via one selected from a plurality of transmission beams The beam receives an external signal from the cell, the external signal has a synchronization signal block (SSB), and the synchronization signal block includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH); Use the primary synchronization signal and the auxiliary synchronization signal to obtain the cell identification number of the cell; select the synchronization signal block based on the first correlation between the external signal and the first internal signal of the terminal The first candidate index of the first plurality of candidate indexes of is to indicate the selected transmission beam; and the first candidate index is used to perform decoding on the physical broadcast channel.

According to an aspect of the concept of the present invention, there is provided a terminal for performing communication with a cell, the terminal including: a plurality of antennas configured to form a plurality of receiving beams, the plurality of receiving beams being used to pass through selected from a plurality of transmission beams One of the selected transmission beams receives an external signal from the cell. The external signal has a synchronization signal block (SSB), and the synchronization signal block includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical Broadcast channel (PBCH); and a processing circuit system configured to: use the primary synchronization signal and the auxiliary synchronization signal to obtain the cell identification number of the cell, and determine the number of candidate indexes of the synchronization signal block Decoding priorities, and performing decoding on the physical broadcast channel based on the plurality of decoding priorities.

The base station can be the main agent that communicates with the terminal and allocates communication network resources to the terminal, and can be at least one of the following: cell, base station (base station, BS), NodeB (NodeB, NB) ), evolved-node B (evolved-node B, eNB), next generation radio access network (NG RAN), radio access unit, base station controller, and/or network node. In the following, for convenience of description, a base station may be referred to as a cell.

A terminal (or communication terminal) can be a master agent device that communicates with a cell or another terminal and can be called a node, user equipment (UE), next-generation UE (NG UE), mobile station (mobile station). , MS) and/or mobile equipment (ME).

In addition, the terminal may include at least one of the following: smart phone, tablet personal computer (PC), mobile phone, video phone, e-book reader, desktop PC, laptop PC, netbook computer ( netbook computer), personal digital assistant (PDA), MP3 player, medical device, camera and/or wearable device. In addition, the terminal may be at least one of the following: television (TV), digital video disk (digital video disk, DVD) player, audio player, refrigerator (refrigerator), air conditioner (air conditioner), vacuum Vacuum cleaner, oven, microwave oven, washing machine (washer), dryer (dryer), air purifier, set-top box, home automation control panel, security control panel, media box (for example, Samsung HomeSync™, Apple TV™ and/or Google TV™), game consoles (for example, XboxTM and/or PlayStationTM), electronic dictionaries, electronic keys, camcorders and/or electronic photo frames. In addition, the terminal may be at least one of the following: various medical devices (for example, various portable medical measuring devices (for example, blood glucose measuring devices, heart rate measuring devices, blood pressure measuring devices, body temperature measuring devices, etc.) , Magnetic resonance angiography (MRA) devices, magnetic resonance imaging (MRI) devices, computed tomography (CT) devices, imaging devices and/or ultrasound devices), navigation devices, Global navigation satellite system (GNSS), event data recorder (EDR), flight data recorder (FDR), automotive infotainment devices, naval electronic devices (for example, naval navigation Devices, gyro compasses, etc.), avionics, safety devices, automotive head units, industrial robots or consumer goods robots, drones, automated teller machines (ATM), point of sales (POS) ), and/or Internet of things (IoT) devices (for example, bulbs, various sensors, spring cooler devices, fire alarms, temperature controllers, lamp posts, toast Machines (toaster), sports equipment, hot water tanks, heaters, boilers, etc.). In addition, the terminal may include various multimedia systems for performing communication functions.

Hereinafter, the embodiments will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing a wireless communication system 1 according to an exemplary embodiment. FIG. 2A is a diagram illustrating a synchronization signal block (SSB) used for cell search, and FIG. 2B is a table diagram illustrating a reference signal set differently for each index of the SSB.

1, the wireless communication system 1 may include a base station 10 (referred to as a cell 10 herein) and a terminal 100. For ease of description, the wireless communication system 1 is shown as including one cell 10, but this is only an exemplary embodiment. The exemplary embodiment is not limited to this, and the wireless communication system 1 may include more cells. The cell 10 can be connected to the terminal 100 through a wireless channel and can provide various communication services to the terminal 100. The cell 10 can serve all or some user traffic by sharing the channel, and can collect status information (such as the buffer status of the terminal 100, the available transmission power status, the channel status and/or the like) and / Or schedule. The wireless communication system 1 may use orthogonal frequency division multiplexing (OFDM) as a wireless access technology to support beamforming technology. In addition, the wireless communication system 1 can support an adaptive modulation and coding (AMC) scheme, in which the modulation scheme and channel coding rate are determined based on the channel state of the terminal 100.

The wireless communication system 1 can receive signals using (for example, via) a wide frequency band corresponding to a frequency band of 6 gigahertz or greater than 6 gigahertz. For example, the wireless communication system 1 may use a millimeter wave frequency band such as the 28 gigahertz frequency band or the 60 gigahertz frequency band to increase the data transmission rate. In this case, the millimeter wave band can be relatively large in terms of signal attenuation magnitude per distance, and therefore, the wireless communication system 1 can support transmission and/or reception based on directional beams to ensure coverage. Directional beams are generated using multiple antennas. The wireless communication system 1 may perform a beam sweeping operation to perform transmission and/or reception based on a directional beam.

The beam scanning operation may be the following operations: the terminal 100 and/or the cell 10 are used to sequentially or randomly scan the directional beams with a specific pattern to determine the transmission beams and the reception beams with mutually synchronized directions. That is, the patterns of the transmission beam and the reception beam having directions synchronized with each other may be determined as a pair of transceiving beam patterns. The beam pattern may be a beam shape determined as a beam width and beam direction. Hereinafter, an embodiment in which the terminal 100 performs a cell search will be mainly explained. It is assumed that the cell 10 passes through a plurality of transmission beams having different beam patterns (for example, the first transmission beam to the eighth transmission beam) TX_B0 to TX_B7 (for example, the first transmission beam). Transmission beam TX_B0, second transmission beam TX_B1, third transmission beam TX_B2, fourth transmission beam TX_B3, fifth transmission beam TX_B4, sixth transmission beam TX_B5, seventh transmission beam TX_B6 and eighth transmission beam TX_B7) will each include The signal of the SSB searched in the cell is transmitted to the terminal 100. However, for ease of understanding, FIG. 1 is only an embodiment, and some exemplary embodiments are not limited to this. It can be fully understood that there may be various situations depending on the communication environment and/or situation.

1 and 2A, the cell 10 may include one of the first SSB SSB0 to the eighth SSB SSB7 (for example, the first SSB SSB0, the second SSB SSB1, the third SSB SSB2, fourth SSB SSB3, fifth SSB SSB4, sixth SSB SSB5, seventh SSB SSB6, and eighth SSB SSB7) are transmitted to the terminal 100. For example, the cell 10 may transmit the signal including the first SSB SSB0 to the terminal 100 via the first transmission beam TX_B0, and may transmit the signal including the second SSB SSB1 to the terminal 100 via the second transmission beam TX_B1. In this way, the cell 10 can transmit various SSB SSB0 to SSB SSB7 to the terminal 100 via the transmission beams TX_B0 to TX_B7, and the terminal 100 can search for the cell 10 using one of the first SSB SSB0 to the eighth SSB SSB7. In FIG. 1, it can be assumed that the first transmission beam TX_B0 is selected during the beam scanning process and the terminal 100 uses the first SSB SSB0 to perform cell search.

As shown in FIG. 2A, the SSB may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and/or a physical broadcast channel (PBCH). In an embodiment, the SSB may include four symbols, and the PSS, SSS, and PBCH may be located at positions corresponding to resource blocks (RB) in the direction of the frequency axis. In addition, one RB may include twelve subcarriers. For example, the PSS corresponding to the first symbol may be transmitted to the terminal 100 through 127 subcarriers.

In an embodiment, two SSBs can be provided in one slot of the signal, and the cell 10 can transmit the SSB burst set to the terminal 100 during the SSB period. For example, assuming that the wireless communication system 1 is an NR communication system applying a subcarrier spacing of 15 kilohertz (KHz), the cell 10 can transmit the SSB burst set including eight SSB SSB0 to SSB SSB7 to Terminal 100. In this case, the length of one slot may be about 1 millisecond, and the SSB period may be about 20 milliseconds. However, this is only an exemplary embodiment, and some exemplary embodiments are not limited to this. The number of SSBs included in the SSB burst set, the SSB period and/or the length of a slot may be based on the size of the subcarrier spacing, the synchronization signal period set in the cell 10, and/or the time period allocated for cell search ( Such as period).

As described above, each of SSB SSB0 to SSB SSB7 may be transmitted to the terminal 100 via the corresponding transmission beam of the transmission beams TX_B0 to TX_B7 of the cell 10, and each of the SSB SSB0 to SSB SSB7 may include an indication The index of the corresponding transmission beam among the transmission beams TX_B0 to TX_B7. For example, in a situation where the first SSB SSB0 is transmitted via the first transmission beam TX_B0, the first SSB SSB0 may include an index indicating the first transmission beam TX_B0, and the index may correspond to bit data (for example, may be One or more data bit indication). The first SSB SSB0 to the eighth SSB SSB7 may have different indexes (or multiple indexes), and in addition, may include different reference signals. This will be explained in detail with reference to FIG. 2B.

As shown in the table diagram TB1 of FIG. 2B, the first SSB SSB0 may be transmitted via the first transmission beam TX_B0 and may include an index "000", and the reference signal RS included in the PBCH of the first SSB SSB0 may be the first reference Signal RS_0. The second SSB SSB1 may be transmitted via the second transmission beam TX_B1 and may include an index “001”, and the reference signal RS included in the PBCH of the second SSB SSB1 may be the second reference signal RS_1. The third SSB SSB2 may be transmitted via the third transmission beam TX_B2 and may include an index “010”, and the reference signal RS included in the PBCH of the third SSB SSB2 may be the third reference signal RS_2. The fourth SSB SSB3 may be transmitted via the fourth transmission beam TX_B3 and may include the index “011”, and the reference signal RS included in the PBCH of the fourth SSB SSB3 may be the fourth reference signal RS_3. The fifth SSB SSB4 may be transmitted via the fifth transmission beam TX_B4 and may include an index “100”, and the reference signal RS included in the PBCH of the fifth SSB SSB4 may be the fifth reference signal RS_4. The sixth SSB SSB5 may be transmitted via the sixth transmission beam TX_B5 and may include the index "101", and the reference signal RS included in the PBCH of the sixth SSB SSB5 may be the sixth reference signal RS_5. The seventh SSB SSB6 may be transmitted via the seventh transmission beam TX_B6 and may include the index “110”, and the reference signal RS included in the PBCH of the seventh SSB SSB6 may be the seventh reference signal RS_6. The eighth SSB SSB7 may be transmitted via the eighth transmission beam TX_B7 and may include an index "111", and the reference signal RS included in the PBCH of the eighth SSB SSB7 may be the eighth reference signal RS_7.

1 and 2A again, the terminal 100 may receive a signal including the first SSB SSB0 through the first transmission beam TX_B0 selected by the beam scanning operation, and may use the first SSB SSB0 to perform cell search. In detail, the terminal 100 can detect the PSS of the first SSB SSB0 from the time domain, check the timing information about the cell 10 (for example, about 5 milliseconds timing) from the detected PSS, and check the PSS of the first SSB SSB0 The location of the SSS and the cell ID of the cell identification number (ID) group of cell 10. Subsequently, the terminal 100 can detect the SSS from the frequency domain, check the frame timing of the cell 10 from the detected SSS, and check the cell group ID corresponding to the cell 10. However, since the terminal 100 has not determined the index of the first SSB SSB0, the decoding of the PBCH of the first SSB SSB0 is performed by randomly using all candidate indexes expected to be included in the first SSB SSB0. The candidate index may represent an index that can be included in the SSB, and for ease of description, referring to FIG. 2B, each of SSB SSB0 to SSB SSB7 may include eight candidate indexes. In detail, since the terminal 100 has not determined that the first SSB SSB0 includes the index "000" before the decoding operation performed on the PBCH is successful (for example, performed), the first SSB SSB0 can include candidate indexes "000" to "111". An index in ", the first SSB SSB0 can perform decoding operations on the PBCH. Therefore, depending on the situation, multiple PBCH decodings equal to or similar to the number of candidate indexes of the first SSB SSB0 can be performed, and in this case, the cell search may be significantly delayed, thereby causing the communication performance of the terminal 100 reduce.

In order to improve the above shortcomings, the terminal 100 according to an exemplary embodiment may determine the decoding priority of the candidate index of the received SSB, and may perform decoding on the PBCH included in the SSB based on the determined decoding priority to perform fast Cell search operation. That is, the terminal 100 may determine the decoding priority of the candidate index of the first SSB SSB0 so that the candidate index using the first SSB SSB0 is estimated to be the real index of the first SSB SSB0 (for example, indicating that the SSB SSB0 index of the first transmission beam TX_B0) candidate index to perform PBCH decoding.

The terminal 100 according to an exemplary embodiment may generate a correlation degree (for example, a plurality of correlation values representing the degree of correlation between the reference signal sequence corresponding to the candidate index of the SSB and the reference signal included in the SSB). ) Information, and the decoding priority of the candidate index of the SSB can be determined based on the information.

The terminal 100 according to an exemplary embodiment can reduce undesired decoding operations by using candidate indexes estimated to be true indexes of SSB when decoding the PBCH, and therefore, can efficiently and quickly perform cell search. In addition, in the rapidly changing 5G communication environment, the terminal 100 can quickly complete the cell search through the cell search operation based on the decoding priority, and therefore, the stability of the communication can be ensured or improved.

FIG. 3 is a block diagram showing a terminal 100 according to an exemplary embodiment.

3, the terminal 100 may include multiple antennas 110, a radio frequency integrated circuit (RFIC) 120, a baseband processing circuit 130, a baseband processor 140, and/or a memory 150. The terminal 100 of FIG. 3 is only an exemplary embodiment, but some exemplary embodiments are not limited to this. In some exemplary embodiments, the baseband processing circuit 130 may be included in the RF integrated circuit 120 or the baseband processor 140.

The antenna 110 may transmit a signal through a wireless channel (for example, a signal processed by the RF integrated circuit 120), and/or may receive a signal transmitted through a wireless channel from a cell. The antenna 110 may support beamforming and may each be implemented as an array antenna, a patch antenna, and/or the like. Specifically, the antenna 110 may form multiple receiving beams to receive signals transmitted via transmission beams with various patterns from the cell, thereby supporting beam scanning.

The RF integrated circuit 120 can perform low-noise amplification on the signal received by the antenna 110 and can perform down-conversion on the amplified signal to generate a baseband signal. The baseband processing circuit 130 can perform a conversion function between a baseband signal and a bit stream (for example, convert the baseband signal into a bit stream) based on a physical layer specification. For example, the baseband processing circuit 130 may demodulate and decode the baseband signal provided from the RF integrated circuit 120 to recover (eg, generate) the received bit stream.

The baseband processing circuit 130 according to an exemplary embodiment may include a decoding priority determination circuit 132. The decoding priority determination circuit 132 can generate a representative SSB (for example, the SSB included in the transmission beam received from the cell) and the degree of association between the reference signal sequence corresponding to the candidate index of the SSB ( For example, the degree of relevance). The decoding priority determination circuit 132 may reflect the estimated value of the channel between the terminal 100 and the cell in the process of generating information, and/or may consider the phase shift that occurs when receiving a signal including SSB (for example, related to communication Factors).

The decoding priority determination circuit 132 may sort the candidate indexes in descending power order of the degree of association between the reference signal sequence and the reference signals included in the SSB based on the generated information (for example, the sort order or the sort level). ) To determine the decoding priority. In addition, the decoding priority determination circuit 132 may filter at least one candidate index of the SSB candidate index that is not used in the decoding operation based on the generated information, and may determine the decoding priority of the target candidate index applied to the decoding operation.

The baseband processor 140 can control various operations of the terminal 100 related to wireless communication with the cell. According to an exemplary embodiment, the baseband processor 140 may include a fast cell search module 142 for performing a selective cell search operation based on the decoding priority of the candidate index. The fast cell search module 142 may perform decoding on the PBCH of the SSB based on the decoding priority generated by the decoding priority determination circuit 132. In addition, the fast cell search module 142 can use the decoding priority determination circuit 132 to control a series of operations for determining the decoding priority.

The fast cell search module 142 can refer to the decoding priority to select the Nth candidate index corresponding to the first priority, use the reference signal sequence corresponding to the Nth candidate index to estimate the channel between the terminal 100 and the cell, and use The channel estimation result is used to perform the decoding operation on the PBCH. According to some embodiments, channel estimation and decoding operations can be performed in a manner known to those skilled in the art. When the decoding operation performed on the PBCH using the Nth candidate index is successful, the terminal 100 may regard the Nth candidate index as the true index of the SSB (for example, the terminal 100 may determine the Nth candidate index as the correct index of the SSB), and may Report the Nth candidate index to the cell. The cell can transmit signals for wireless communication operations to the terminal 100 via the transmission beam corresponding to the Nth candidate index reported from the terminal 100. When the decoding operation performed on the PBCH using the Nth candidate index fails, the fast cell search module 142 can refer to the decoding priority to select the N+1th candidate index corresponding to the second priority, and use the N+1th candidate index corresponding to the The reference signal sequence is used to estimate the channel between the terminal 100 and the cell, and the channel estimation result is used to decode the PBCH. In this way, the fast cell search module 142 can decode the PBCH by sequentially using the candidate index based on the decoding priority until the decoding on the PBCH is successful.

According to some exemplary embodiments, it is described herein that the operations performed by the terminal 100, the RFIC 120, the baseband processing circuit 130, the decoding priority determination circuit 132, and/or the fast cell search module 142 can be performed by the processing circuit system (for example, The baseband processor 140) executes. The term "processing circuit system" used in this disclosure can refer to, for example, hardware, including logic circuits; hardware/software combinations, such as processors that execute software; or combinations thereof. For example, the processing circuit system can more specifically include, but is not limited to, central processing unit (CPU), arithmetic logic unit (ALU), digital signal processor, microcomputer, field programmable gate Field programmable gate array (FPGA), System-on-Chip (SoC), programmable logic unit, microprocessor, application-specific integrated circuit (ASIC), etc. For example, the fast cell search module 142 can be implemented as hardware logic provided in the baseband processor 140. In addition, the fast cell search module 142 can be implemented as software logic, which is stored in the memory 150 as a plurality of instruction codes and executed by the baseband processor 140.

The memory 150 can store data (for example, basic programs, application programs, and/or configuration information used for the operation of the terminal 100) and can provide the stored data in response to a request from the baseband processor 140. The memory 150 can store various data generated by the decoding priority determination circuit 132. For example, the memory 150 may store information representing the degree of association between the reference signal included in the SSB and the reference signal sequence respectively corresponding to the candidate index of the SSB or information representing the decoding priority of the candidate index of the SSB.

The memory 150 may include, for example, internal memory and/or external memory. The internal memory may include, for example, at least one of the following: volatile memory (for example, dynamic random access memory (DRAM) and/or synchronous dynamic random access memory (synchronous dynamic random access memory)). , SDRAM)) or non-volatile memory (for example, one time programmable read only memory (OTPROM), programmable read only memory (PROM), Erasable programmable read only memory (erasable programmable read only memory, EPROM), electrical erasable programmable read only memory (electrical erasable programmable read only memory, EEPROM), mask type read only memory ( ROM), flash read-only memory (ROM), flash memory, hard drive and/or solid state drive (SSD)). External memory can include flash drives (for example, compact flash (CF), secure digital (SD), micro-SD (micro-SD), mini-SD), extreme digital (Extreme digital, xD), multimedia card (multi-media card, MMC) and/or memory stick). The external memory can be functionally and/or physically connected to the terminal 100 through various interfaces.

Fig. 4 is a flowchart of an operating method of a terminal according to an exemplary embodiment.

4, the terminal may receive a signal including the SSB via a transmission beam formed by the cell in operation S100 and may use the PSS and the SSS of the SSB to obtain an identifier (ID) of the cell. In operation S110, the terminal may analyze the SSB to perform a fast cell search operation. In order to analyze the SSB, the terminal can generate an internal signal corresponding to the SSB, compare the internal signal with the received SSB, and plan the process of decoding the PBCH of the SSB in advance (for example, by determining the decoding priority). In detail, the terminal can generate information representing the degree of association between the reference signal sequence corresponding to the candidate index of the SSB and the reference signal included in the SSB. In operation S120, as a basis of the fast cell search operation, the terminal may determine the decoding priority of the candidate index of the SSB. In detail, the terminal may sort the candidate indexes in descending order of the degree of association between the reference signal sequence and the reference signals included in the SSB based on the information generated in operation S110 to determine the decoding priority. Subsequently, in operation S130, the terminal may perform decoding on the PBCH of the SSB based on the decoding priority.

FIG. 5 is a detailed flowchart of the operation method of the terminal in operation S110 and operation S120 shown in FIG. 4 according to an exemplary embodiment.

5, in operation S112, the terminal may use the cell ID obtained in operation S100 and the candidate index of the SSB received in operation S100 to generate a reference signal sequence (for example, with the candidate index of the SSB and the candidate index of the SSB, respectively). Reference signal sequence corresponding to the included reference signal). That is, since the reference signals included in the SSB are different based on the index of the SSB, the terminal can generate different reference signal sequences based on the candidate index of the SSB.

In operation S114, the terminal may calculate the degree of correlation (for example, the degree of correlation) between the received signal and the reference signal sequence (for example, by performing arithmetic operations). In an embodiment, the terminal may perform a fast Fourier transform (FFT) on the received signal received from the cell to extract the SSB from the received signal after the fast Fourier transform has been performed. The terminal can calculate the degree of correlation between the reference signal sequence and the reference signal included in the retrieved SSB. In an embodiment, the terminal can descramble the reference signal sequence and the reference signal of the SSB for each position to generate multiple energy values, and can combine the multiple energy values to generate the reference signal sequence and The degree of correlation between SSB reference signals. Unmixing may mean the operation of generating a value representing the degree of energy correlation between the reference signal sequence and the reference signal of the SSB. That is, the terminal can check the degree of match between the reference signal of the SSB and the reference signal sequence based on unmixing.

In operation S122, the terminal may determine the decoding priority of the candidate index of the SSB based on the degree of association between the reference signal included in the SSB and the reference signal sequence. As described above, the terminal can determine the decoding priority of the candidate index of the SSB in descending order of the degree of association. In addition, the terminal may exclude (for example, remove) candidate indexes of the SSB having an association degree equal to or less than the reference value from the decoding operation performed on the PBCH. According to some exemplary embodiments, operations S112 and S114 may be performed as part of operation S110, and operation S122 may be performed as part of operation S120 of FIG. 4.

FIG. 6 is a block diagram showing a baseband processing circuit 130 according to an embodiment. 7A is a table diagram for explaining the operation of the reference signal sequence generating circuit 134 shown in FIG. 6, and FIG. 7B is for explaining each of the correlation calculation circuit 136 and the decoding priority determination circuit 132 shown in FIG. 6 Operational table diagram.

Referring to FIG. 6, the baseband processing circuit 130 may include a decoding priority determination circuit 132, a reference signal sequence generation circuit 134 and/or an associated calculation circuit 136. The reference signal sequence generation circuit 134 may receive the candidate index SSB_Cindex and the cell ID Cell_ID of the SSB, and may use the candidate index SSB_Cindex (as discussed herein, the candidate index SSB_Cindex may refer to a single candidate index or multiple candidate indexes) and the cell ID Cell_ID. Generate the reference signal sequence S_seq. To help understanding, further referring to the second table TB2 of FIG. 7A, the candidate index SSB_Cindex of the SSB may correspond to one of "000" to "111", and when the total number of the candidate index SSB_Cindex of the SSB is 8, the reference signal The sequence generating circuit 134 can generate eight reference signal sequences S_seq_0 to S_seq_7 (for example, the first reference signal sequence S_seq_0, the second reference signal sequence S_seq_1, the third reference signal sequence S_seq_2, the fourth reference signal sequence S_seq_3, the fifth reference signal sequence S_seq_4, the sixth reference signal sequence S_seq_5, the seventh reference signal sequence S_seq_6, and the eighth reference signal sequence S_seq_7). According to some exemplary embodiments, the second table TB2 of FIG. 7A or another table that associates a candidate index with a cell ID and a corresponding reference signal sequence may be stored in a memory (for example, the memory 150), and may be The reference signal sequence generating circuit 134 accesses to generate a reference signal sequence based on the candidate index and the cell ID (for example, the candidate index SSB_Cindex and the cell ID Cell_ID). The reference signal sequence generating circuit 134 may receive the candidate index SSB_Cindex and the cell ID Cell_ID of the SSB from the baseband processor 140, and/or may receive the candidate index SSB_Cindex and the cell ID Cell_ID generated by each free radical processing circuit 130.

6 again, the correlation calculation circuit 136 may perform arithmetic operations on the degree of correlation between the reference signal sequence S_seq and the reference signal R_signal extracted from the SSB included in the received signal (for example, arithmetic operations may be performed to determine the degree of correlation Or correlation) to output the calculation result Result_cor to the decoding priority determination circuit 132. To help understanding, further referring to the third table TB3 of FIG. 7B, the correlation calculation circuit 136 can calculate the correlation degree between the eight reference signal sequences S_seq_0 to S_seq_7 and the reference signal R_signal to generate and correspond to the eight reference signal sequences S_seq_0 to S_seq_7 The eight calculation results Result_cor associated with the candidate index SSB_Cindex. In FIG. 6, it is shown that the calculation result Result_cor generated by the correlation calculation circuit 136 is directly provided to the decoding priority determination circuit 132, but this is only an exemplary embodiment, and some exemplary embodiments are not limited to this. In some exemplary embodiments, the calculation result Result_cor may be stored as data in a memory, and the decoding priority determination circuit 132 may access the memory to refer to the calculation result Result_cor (as discussed herein, the calculation result Result_cor may be Refers to a calculation result or multiple calculation results) to determine the decoding priority. According to some exemplary embodiments, the operations described herein as being performed by the reference signal sequence generation circuit 134 and/or the associated calculation circuit 136 may be performed by the processing circuitry.

6 again, the decoding priority determination circuit 132 may sort the candidate indexes in the order of candidate indexes corresponding to the reference signal sequence S_seq having a high degree of correlation with the reference signal R_signal based on the calculation result Result_cor to determine the decoding priority. To help understanding, further referring to the third table TB3 of FIG. 7B, the decoding priority determination circuit 132 may use the candidate index “011”, the candidate index “111”, the candidate index “010”, the candidate index “001”, The sequence of candidate index "000", candidate index "100", candidate index "101" and candidate index "110" determines the decoding priority PR. That is, the decoding priority determination circuit 132 may determine the decoding priority PR so that the candidate index corresponding to the reference signal sequence S_seq having the highest degree of association or the highest degree of association with the reference signal R_signal is prioritized during PBCH decoding. For example, when decoding the PBCH, the candidate index "011", the candidate index "111", the candidate index "010", the candidate index "001", the candidate index "000", the candidate index can be used based on the decoding priority PR. The order of "100", candidate index "101", and candidate index "110" uses the candidate index.

8A and FIG. 8B are block diagrams showing the association calculation circuits 136 and 136' according to an exemplary embodiment.

Referring to FIG. 8A, the correlation calculation circuit 136 may include an unmixing block 136a and/or an energy combination block 136b. The unmixing block 136a can receive the reference signal R_signal and the reference signal sequence S_seq corresponding to a candidate index, and can use the reference signal R_signal and the reference signal sequence S_seq to perform the unmixing operation. The unmixing block 136a can perform a calculation operation indicating the degree of energy correlation between the reference signal R_signal and the reference signal sequence S_seq. Since the reference signal R_signal is in a specific frequency range, the unmixing block 136a can unmix the reference signal R_signal and the reference signal sequence S_seq for each frequency position to generate multiple energy values (for example, the reference signal R_signal and the reference signal sequence The energy value of each frequency position of each of S_seq). According to some exemplary embodiments, the reference signal sequence S_seq is stored in an unmixed form corresponding to multiple energy values. The energy combination block 136b may combine the multiple energy values generated by the unmixing block 136a to generate a calculation result Result_cor corresponding to a candidate index. According to some exemplary embodiments, the multiple energy values of each reference signal sequence S_seq may be the same as the energy value of the reference signal R_signal (for example, at the frequency position of the reference signal R_signal and/or within the specific frequency range of the reference signal R_signal The energy value within) is combined (for example, added, subtracted, and/or correlated) to generate the calculation result Result_cor of each candidate index.

However, the configuration of the association calculation circuit 136 is only an exemplary embodiment, but some exemplary embodiments are not limited to this. In some exemplary embodiments, the correlation calculation circuit 136 may perform various arithmetic operations to quantitatively check the degree of correlation between the reference signal R_signal and the reference signal sequence S_seq (for example, the degree to which the reference signal R_signal matches the reference signal sequence S_seq). According to some exemplary embodiments, the operations described herein as being performed by the unmixing block 136a and/or the energy combining block 136b may be performed by the processing circuit system.

Referring to FIG. 8B, compared with the correlation calculation circuit 136 of FIG. 8A, the correlation calculation circuit 136' may further include a correction block 136c. In the following, the operation of the correction block 136c will be mainly explained. The correction block 136c can control the unmixing block 136a to perform the unmixing operation based on the current communication environment between the cell and the terminal.

In an embodiment, the correction block 136c may use the estimated value of the channel between the terminal and the cell to correct the reference signal R_signal, and/or may control the unmixing block 136a to perform the unmixing operation. In this case, the correction block 136c can estimate the channel between the terminal and the cell and can provide the estimated value of the channel to the unmixing block 136a.

In an embodiment, the correction block 136c may control the de-stirring block 136a to use multiple energy values based on frequency positions generated by the de-stirring block 136a based on the phase shift that occurs when the terminal receives a signal including SSB from the cell. To generate multiple energy values corrected by interpolation.

In an embodiment, the calibration block 136c may control the energy combination block 136b to reflect the weight values set for multiple energy values (for example, factors associated with communication) based on the communication environment in the unmixing block The multiple energy values generated by 136a are combined. For example, the correction block 136c may control the energy combination block 136b to multiply the first energy value by the first weight value and the second energy value by the second weight value to correct each energy value, and based on the communication environment The first energy value and the second energy value are combined. The weight value information based on the communication environment may be stored in the calibration block 136c in the form of a look-up table, or the calibration block 136c may flexibly (for example, dynamically) generate the weight value information based on the communication environment.

FIG. 9 is a detailed flowchart of the operation method of the terminal in operation S130 shown in FIG. 4 according to an exemplary embodiment.

9, in operation S131, the terminal may refer to the received decoding priority of the candidate index of the SSB to select the candidate index having the Nth priority (for example, the highest priority). In operation S132, the terminal may use the selected candidate index to decode the PBCH. In detail, the terminal can use the reference signal sequence corresponding to the selected candidate index and the received SSB reference signal to estimate the channel between the cell and the terminal, and can use the channel estimation result to decode the PBCH . According to some exemplary embodiments, channel estimation and decoding will be performed in a manner known to those skilled in the art. In operation S133, the terminal may determine whether the decoding succeeds or fails based on a specific scheme (for example, a cyclic redundancy code (CRC) check scheme). When the decoding is successful (S133, Yes), the terminal may report the selected candidate index to the cell, and may end (for example, successfully complete) the cell search operation. Otherwise, when the decoding fails (S133, No), the terminal may determine whether "N" corresponds to "L1" representing the number of candidate indexes of the SSB in operation S134. When "N" does not correspond to "L1" (S134, No) (for example, when N is not the last candidate index in the priority order), the terminal may increment "N" in operation S135 and may proceed to operation S131 . That is, the terminal can select a candidate index with the N+1th priority (the next highest priority) and perform subsequent operations. Otherwise, when "N" corresponds to "L1" (S134, YES), the terminal can check (for example, determine) that the PBCH decoding operation based on the decoding priority has failed and can receive a new SSB from the cell to proceed to Figure 4 Operation S100, or another previously received SSB may be used to proceed to operation S100 of FIG. 4.

FIG. 10 is a block diagram showing a baseband processing circuit 130' according to an embodiment.

10, the baseband processing circuit 130' may include a decoding priority determination circuit 132", a reference signal sequence generation circuit 134, and/or an associated calculation circuit 136. The decoding priority determination circuit 132" may include a target candidate index determination circuit 132d. Hereinafter, the operation of the target candidate index determination circuit 132d will be mainly explained. According to some exemplary embodiments, the operations described herein as being performed by the baseband processing circuit 130', the decoding priority determination circuit 132", and/or the target candidate index determination circuit 132d may be performed by the processing circuit system.

The target candidate index determination circuit 132d according to an exemplary embodiment may determine the target candidate index for PBCH decoding among the candidate indexes of the SSB based on the calculation result Result_cor generated by the association calculation circuit 136. That is, since the target candidate index determination circuit 132d determines the target candidate index, the terminal can perform PBCH decoding using the target candidate index remaining after filtering out candidate indexes that are not suitable for the desired condition among the candidate indexes of the SSB, instead of using the SSB. All candidate indexes to perform PBCH decoding.

The target candidate index determining circuit 132d may compare the calculation result Result_cor (for example, each degree of association or value) with a reference value to compare candidate indexes (for example, one or more candidate indexes) corresponding to the calculation result exceeding the reference value. Determine the target candidate index. The reference value may be a value set in advance in the target candidate index determination circuit 132d, or may be a value generated by the target candidate index determination circuit 132d using the calculation result Result_cor. For example, the target candidate index determination circuit 132d may perform an average operation on the calculation result Result_cor to generate a reference value, or may use a weighted average operation to generate a reference value based on the communication environment between the cell and the terminal. In addition, the target candidate index determination circuit 132d may use various schemes to generate the reference value. The decoding priority determination circuit 132" may use the calculation result Result_cor to determine the decoding priority of the target candidate index. As described above, in the process of determining the decoding priority, candidate indexes for which PBCH decoding performed is expected to fail can be removed in advance, and therefore, a cell search can be performed faster.

FIG. 11 is a detailed flowchart of the operation method of the terminal in operation S110 and operation S120 shown in FIG. 4 according to an exemplary embodiment.

Referring to FIG. 4, after operation S100 of FIG. 4, the terminal may use the cell ID and the candidate index of the SSB to generate a reference signal sequence in operation S112. In operation S114, the terminal may calculate the degree of correlation between the received signal and the reference signal sequence (for example, by performing an arithmetic operation). In operation S124, the terminal may determine the target candidate index of the SSB based on the degree of association and the reference value. In operation S126, the terminal may determine the decoding priority of the target candidate index of the SSB based on the degree of association. Subsequently, the terminal may proceed to operation S130 of FIG. 4. According to some exemplary embodiments, operations S112 and S114 may be performed as part of operation S110 of FIG. 4, and may be the same as or similar to operations S112 and S114 of FIG. 5. Operations S124 and S126 may be performed as a part of operation S120 of FIG. 4 and/or operation S122 of FIG. 5.

FIG. 12 is a detailed flowchart of the operation method of the terminal in operation S130 shown in FIG. 11 according to an exemplary embodiment.

12, in operation S131', the terminal may refer to the decoding priority of the received target candidate index of the SSB to select the target candidate index having the Nth priority (for example, the highest priority). In operation S132', the terminal may use the selected target candidate index to decode the PBCH. In detail, the terminal can use the reference signal sequence corresponding to the selected target candidate index and the reference signal of the received SSB to estimate the channel between the cell and the terminal, and can use the channel estimation result to decode the PBCH . In operation S133', the terminal may determine whether the decoding succeeds or fails based on a specific scheme (for example, a CRC check scheme). When the decoding is successful (S133', Yes), the terminal may report the selected target candidate index to the cell, and may end (for example, successfully complete) the cell search operation. Otherwise, when the decoding fails (S133', No), the terminal may determine in operation S134' whether "N" corresponds to "L2" representing the number of target candidate indexes of the SSB. When "N" does not correspond to "L2" (S134, No) (for example, when N is not the last target candidate index in the priority order), the terminal may increment "N" in operation S135' and may proceed to Operation S131'. That is, the terminal can select the target candidate index with the N+1th priority (for example, the next highest priority) and perform subsequent operations. Otherwise, when "N" corresponds to "L2" (S134, YES), the terminal may check (for example, determine) that the PBCH decoding operation based on the decoding priority has failed, and may receive a new SSB from the cell to proceed to Figure 4 Operation S100, or may proceed to operation S100 of FIG. 4 using another previously received SSB.

FIG. 13 is a block diagram showing an electronic device 1000 according to an exemplary embodiment.

13, the electronic device 1000 may include a memory 1010, a processor unit 1020, an input/output (I/O) controller 1040, a display unit 1050, an input device 1060, and/or a communication processing unit 1090. Here, the memory 1010 may be provided in multiple. These elements will be explained below.

The memory 1010 may include a program storage unit 1011 that can store a program for controlling the operation of the electronic device 1000 and a data storage unit 1012 that can store data generated during the execution of the program. According to some exemplary embodiments, the program storage unit 1011 and the data storage unit 1012 may be partitions and/or portions of the memory 1010 configured to store data. The data storage unit 1012 can store data used for the operation of the application program 1013 and/or the operation of the fast cell search program 1014. The program storage unit 1011 may include (for example, store) an application program 1013 and/or a fast cell search program 1014. Here, the program stored in the program storage unit 1011 may include a set of instructions and may be referred to as an instruction set.

The application program 1013 may include an application program executed in the electronic device 1000. That is, the application program 1013 may include instructions of an application driven (for example, executed) by a processing circuit system (for example, by the processor 1022). According to an embodiment, the fast cell search program 1014 can control the operation of determining a transceiving beam pattern pair. That is, by using the fast cell search program 1014, the electronic device 1000 can determine the decoding priority of the candidate index of the SSB based on the correlation between the received signal of the electronic device 1000 and the internal signal, and can be based on the determined decoding priority Right to perform PBCH decoding.

The peripheral device interface 1023 can control the connection between the I/O peripheral devices of the base station, the processor 1022 and/or the memory interface 1021. The processor 1022 can use at least one software program to perform control (for example, to control the operation of the electronic device 1000) to enable the base station to provide corresponding services. In this case, the processor 1022 can execute at least one program stored in the memory 1010 to provide a service corresponding to the corresponding program.

The I/O controller 1040 can provide an interface between the peripheral device interface 1023 and the I/O device (such as the display unit 1050 and the input device 1060). The display unit 1050 displays status information, input letters, moving pictures, still pictures, and/or similar information. For example, the display unit 1050 can display application information driven by the processor 1022.

The input device 1060 can provide input data generated by the selection and input of the electronic device 1000 to the processor unit 1020 via the I/O controller 1040. In this case, the input device 1060 may include a keypad, the keypad including at least one hardware button and/or a touch pad for sensing touch information. For example, the input device 1060 can use the I/O controller 1040 to provide touch information (such as touch, touch motion, and/or touch release) each sensed by the touchpad to the processor 1022 .

The electronic device 1000 may include a communication processing unit 1090. The communication processing unit 1090 can perform communication functions for voice communication and/or data communication, and the fast cell search program 1024 can control the communication processing unit 1090 to generate data based on the fast cell search operation. Receive beam for cell search.

FIG. 14 is a diagram illustrating a communication device for performing a fast cell search operation according to an exemplary embodiment.

14, a home gadget 2100, a home appliance 2120, an entertainment device 2140, and/or an access point (AP) 2200 may each perform a fast cell search operation according to an embodiment. In some embodiments, the household device 2100, the household appliance 2120, the entertainment device 2140, and/or the AP 2200 may constitute an IoT network system. The communication device shown in FIG. 13 is only an exemplary embodiment, and it can be understood that other communication devices not shown in FIG. 13 may also include the terminal 100 according to the exemplary embodiment.

The various operations of the above method can be performed by any suitable device (for example, a processing circuit system) capable of performing the operations. For example, the operation of the above method can be performed by various hardware and/or software implemented in a certain form of hardware (for example, a processor, ASIC, etc.).

The software may include an ordered list of executable instructions for implementing logic functions, and may be implemented in any "processor readable medium" for instruction execution systems, appliances, or devices (such as single-core A processor or a multi-core processor or a system containing a processor) is used or used in combination with an instruction execution system, appliance, or device (such as a single-core processor or a multi-core processor or a system containing a processor).

The methods or algorithms and functional blocks or operations described in combination with some exemplary embodiments disclosed herein can be directly implemented in hardware, in a software module executed by a processor, or in a combination of the two . If implemented in software, the function can be stored as one or more instructions or codes on a tangible, non-transitory computer-readable medium or transmitted via a tangible, non-transitory computer-readable medium. Software modules can reside in random access memory (RAM), flash memory, read-only memory (ROM), electrically programmable ROM (EPROM), electrically erasable and programmable ROM (EEPROM), scratchpad, hard disk, removable disk, CD ROM (compact disc ROM, CD ROM), or any other form of storage media known in this technology.

When performing a cell search, the conventional device determines the index of the SSB by randomly or sequentially trying to decode the PBCH of the SSB using each of the candidate indexes of the received SSB. Therefore, the conventional device may iteratively try to decode using all candidate indexes of the SSB before successfully decoding the PBCH, resulting in excessive decoding operations and resource consumption (for example, processor, power, etc.). In addition, excessive decoding operations will increase the delay in completing the cell search operation, thereby reducing the communication performance of the conventional device.

However, some exemplary embodiments provide an improved terminal capable of determining which candidate indexes are most likely to be the correct candidate indexes. Therefore, the improved terminal can determine the decoding priority based on which candidate indexes are most likely to be the correct candidate indexes. By iteratively decoding the PBCH according to the determined decoding priority, the improved terminal will reduce the number of decoding operations performed, thereby reducing resource consumption and the delay in completing cell search operations. This reduction in delay is particularly important to ensure or improve communication stability in the rapidly changing 5G communication environment.

Although the inventive concept has been specifically illustrated and explained with reference to the embodiments of the inventive concept, it should be understood that various changes in form and details can be made in this document without departing from the spirit and scope of the scope of the patent application below.

1: Wireless communication system 10: Base station/community 100: terminal 110: Antenna 120: Radio Frequency Integrated Circuit (RFIC) 130, 130': baseband processing circuit 132, 132'': Decoding priority determination circuit 132d: Target candidate index determination circuit 134: Reference signal sequence generating circuit 136, 136': associated calculation circuit 136a: Unmixing block 136b: Energy Combination Block 136c: correction block 140: baseband processor 142: Fast community search module 150: memory 1000: Electronic device 1010: memory 1011: Program storage unit 1012: data storage unit 1013: application 1014: Fast community search program 1020: processor unit 1021: Memory interface 1022: processor 1023: Peripheral device interface 1040: Input/Output (I/O) Controller 1050: display unit 1060: input device 1090: Communication processing unit 2100: Household Parts 2120: Household appliances 2140: Entertainment Device 2200: Access Point (AP) Cell_ID: Cell ID PR: Decoding priority Result_cor: calculation result R_signal: Reference signal RS_0: The first reference signal RS_1: second reference signal RS_2: The third reference signal RS_3: The fourth reference signal RS_4: Fifth reference signal RS_5: The sixth reference signal RS_6: Seventh reference signal RS_7: Eighth reference signal S100, S110, S112, S114, S120, S122, S124, S126, S130, S131, S131', S132, S132', S133, S133', S134, S134', S135, S135': Operation S_seq: Reference signal sequence S_seq_0: Reference signal sequence/First reference signal sequence S_seq_1: Reference signal sequence/Second reference signal sequence S_seq_2: Reference signal sequence/Third reference signal sequence S_seq_3: Reference signal sequence/Fourth reference signal sequence S_seq_4: Reference signal sequence/Fifth reference signal sequence S_seq_5: Reference signal sequence/Sixth reference signal sequence S_seq_6: Reference signal sequence/seventh reference signal sequence S_seq_7: Reference signal sequence/Eighth reference signal sequence SSB_Cindex: Candidate index SSB0: SSB/First SSB SSB1: SSB/Second SSB SSB2: SSB/third SSB SSB3: SSB/fourth SSB SSB4: SSB/5th SSB SSB5: SSB/Sixth SSB SSB6: SSB/seventh SSB SSB7: SSB/eighth SSB TB1: table diagram TB2: Form 2 TB3: Third Form TX_B0: first transmission beam/transmission beam TX_B1: second transmission beam/transmission beam TX_B2: third transmission beam/transmission beam TX_B3: Fourth transmission beam/transmission beam TX_B4: fifth transmission beam/transmission beam TX_B5: sixth transmission beam/transmission beam TX_B6: seventh transmission beam/transmission beam TX_B7: Eighth transmission beam/transmission beam

Read the following detailed description in conjunction with the accompanying drawings to understand the embodiments of the concept of the present invention more clearly. In the accompanying drawings: FIG. 1 is a block diagram showing a wireless communication system according to an exemplary embodiment. FIG. 2A is a diagram illustrating a synchronization signal block (SSB) used for cell search, and FIG. 2B is a table diagram illustrating a reference signal set differently for each index of the SSB. FIG. 3 is a block diagram showing a terminal according to an exemplary embodiment. Fig. 4 is a flowchart of an operating method of a terminal according to an exemplary embodiment. FIG. 5 is a detailed flowchart of the operation method of the terminal in operation S110 and operation S120 shown in FIG. 4 according to an exemplary embodiment. Fig. 6 is a block diagram showing a fundamental frequency processing circuit according to an embodiment. 7A is a table diagram for explaining the operation of the reference signal sequence generating circuit shown in FIG. 6, and FIG. 7B is for explaining each of the correlation calculation circuit (correlation calculation circuit) and the decoding priority determination circuit shown in FIG. 6 Table diagram of the operator’s operations. 8A and 8B are block diagrams showing an association calculation circuit according to an exemplary embodiment. FIG. 9 is a detailed flowchart of the operation method of the terminal in operation S130 shown in FIG. 4 according to an exemplary embodiment. FIG. 10 is a block diagram showing a fundamental frequency processing circuit including a target candidate index determination circuit according to an embodiment. FIG. 11 is a flowchart of an operation method of a terminal including the baseband processing circuit shown in FIG. 10 according to an exemplary embodiment. FIG. 12 is a detailed flowchart of the operation method of the terminal in operation S130 shown in FIG. 11 according to an exemplary embodiment. FIG. 13 is a block diagram showing an electronic device according to an exemplary embodiment. FIG. 14 is a diagram illustrating a communication device for performing a fast cell search operation according to an exemplary embodiment.

1: Wireless communication system

10: Base station/community

100: terminal

TX_B0: first transmission beam/transmission beam

TX_B1: second transmission beam/transmission beam

TX_B2: third transmission beam/transmission beam

TX_B3: Fourth transmission beam/transmission beam

TX_B4: fifth transmission beam/transmission beam

TX_B5: sixth transmission beam/transmission beam

TX_B6: seventh transmission beam/transmission beam

TX_B7: Eighth transmission beam/transmission beam

Claims (22)

An operation method of a terminal in a wireless communication system, the wireless communication system including a cell and the terminal, the operation method including: Receiving an external signal including a synchronization signal block from the cell, the synchronization signal block including a main synchronization signal, an auxiliary synchronization signal, and a physical broadcast channel; Using the primary synchronization signal and the secondary synchronization signal to obtain the cell identification number of the cell; Determining multiple decoding priorities of multiple candidate indexes of the synchronization signal block; and Performing decoding on the physical broadcast channel based on the plurality of decoding priorities. The operation method according to claim 1, wherein determining the plurality of decoding priorities includes: Generating a plurality of correlation values by determining the degree of correlation between the plurality of reference signal sequences corresponding to the plurality of candidate indexes and the reference signals included in the synchronization signal block; and The multiple decoding priorities are determined based on the multiple associated values. The operation method according to claim 2, wherein determining the plurality of decoding priorities includes: The multiple candidate indexes are sorted in a descending order of the multiple associated values. The operation method according to claim 2, wherein determining the plurality of decoding priorities includes: The multiple reference signal sequences are generated based on the multiple candidate indexes and the cell identification number. The operation method according to claim 2, wherein generating the multiple associated values includes: The multiple associated values are generated based on the estimated value of the channel between the cell and the terminal. The operation method according to claim 2, wherein generating the multiple associated values includes: The multiple correlation values are generated based on the phase shift of the external signal. The operation method according to claim 1, wherein determining the plurality of decoding priorities includes: Determining at least one target candidate index among the plurality of candidate indexes; and The decoding priority of the at least one target candidate index among the plurality of decoding priorities is determined. The operation method according to claim 7, wherein determining the at least one target candidate index includes: Generating a plurality of correlation values by determining the degree of correlation between the plurality of reference signal sequences corresponding to the plurality of candidate indexes and the reference signals included in the synchronization signal block; and The at least one target candidate index is determined based on the plurality of associated values and reference values. The operation method according to claim 1, wherein the performing decoding includes: Selecting the first candidate index corresponding to the highest priority among the plurality of decoding priorities among the plurality of candidate indexes; Use the first reference signal sequence corresponding to the first candidate index to estimate the channel between the cell and the terminal to generate a first channel estimation result; and Perform a first decoding operation on the physical broadcast channel using the first channel estimation result. The operation method according to claim 9, wherein the performing decoding includes: When the first decoding operation fails, selecting a second candidate index corresponding to the second highest priority among the plurality of decoding priorities among the plurality of candidate indexes; Using a second reference signal sequence corresponding to the second candidate index to estimate the channel between the cell and the terminal to generate a second channel estimation result; and Perform a second decoding operation on the physical broadcast channel using the second channel estimation result. The operation method described in claim 1, further including: When the decoding execution is successful, the candidate index among the multiple candidate indexes used in the decoding execution is reported to the cell. The method of operation described in claim 1, wherein The synchronization signal block is received by the terminal from the cell via one of a plurality of transmission beams. An operation method of a terminal in a wireless communication system, the wireless communication system including a cell and the terminal, the operation method including: An external signal is received from the cell via a selected transmission beam selected from a plurality of transmission beams, the external signal having a synchronization signal block, the synchronization signal block including a main synchronization signal, an auxiliary synchronization signal, and a physical broadcast channel ； Using the primary synchronization signal and the secondary synchronization signal to obtain the cell identification number of the cell; Based on the first degree of association between the external signal and the first internal signal of the terminal, the first candidate index among the first plurality of candidate indexes of the synchronization signal block is selected to indicate the selected transmission beam ;as well as Perform decoding on the physical broadcast channel using the first candidate index. The operation method described in claim 13 further includes: When the decoding of the physical broadcast channel using the first candidate index fails, the second candidate of the first plurality of candidate indexes is selected based on the second correlation between the external signal and the second internal signal Index to indicate the selected transmission beam; and Performing decoding on the physical broadcast channel using the second candidate index. The operation method described in claim 13 further includes: Determining the first degree of association between the external signal and the first internal signal, Wherein determining the first degree of association includes: determining the degree of association between each of a plurality of reference signal sequences and a reference signal included in the synchronization signal block, and the plurality of reference signal sequences correspond to For the first plurality of candidate indexes, the first internal signal is one of the plurality of reference signal sequences. The operation method according to claim 13, wherein performing decoding on the physical broadcast channel includes: Performing channel estimation using a reference signal sequence and a reference signal, the reference signal sequence being generated from the first candidate index and the cell identification number, and the reference signal being included in the synchronization signal block; and Perform decoding on the physical broadcast channel using the first candidate index and the channel estimation result. The operation method according to claim 13, wherein The first degree of association between the external signal and the first internal signal is determined based on factors associated with communication between the cell and each of the terminals. The operation method described in claim 13 further includes: Remove one or more candidate indexes from the second plurality of candidate indexes of the synchronization signal block to generate the first plurality of candidate indexes, and the removal is based on each of a plurality of reference signal sequences The degree of relevance between each and the reference signal included in the synchronization signal block, and the first plurality of candidate indexes include the one or more candidates that are not removed by the removal The second plurality of candidate indexes of the index. The operation method described in claim 16 further includes: When decoding the physical broadcast channel using the first candidate index is successful, report the first candidate index to the cell. A terminal for performing communication with a cell, the terminal including: A plurality of antennas are configured to form a plurality of receiving beams for receiving an external signal from the cell via a selected transmission beam selected from a plurality of transmission beams, the external signal having a synchronization signal Block, the synchronization signal block includes a main synchronization signal, an auxiliary synchronization signal and a physical broadcast channel; and The processing circuit system is configured as: Using the primary synchronization signal and the secondary synchronization signal to obtain the cell identification number of the cell, Determining multiple decoding priorities of multiple candidate indexes of the synchronization signal block, and Performing decoding on the physical broadcast channel based on the plurality of decoding priorities. The terminal according to claim 20, wherein the processing circuit system is configured to: Determining the degree of association between the multiple reference signal sequences corresponding to the multiple candidate indexes and the reference signals included in the synchronization signal block; and The multiple decoding priorities are determined based on the degree of association. The terminal according to claim 21, wherein the processing circuit system is configured to: Determining at least one target candidate index among the plurality of candidate indexes; and The decoding priority of the at least one target candidate index among the plurality of decoding priorities is determined.

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