WO2023003424A1 - 무선 통신 시스템에서 xdd 단말을 위한 통신 방법 및 장치 - Google Patents
무선 통신 시스템에서 xdd 단말을 위한 통신 방법 및 장치 Download PDFInfo
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- H04L5/00—Arrangements affording multiple use of the transmission path
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Definitions
- the present disclosure relates to a communication method and apparatus for a cross-division duplex (XDD) terminal in a wireless communication system, and more particularly to a communication method and apparatus for performing PRACH transmission by an XDD terminal.
- XDD cross-division duplex
- 5G mobile communication technology defines a wide frequency band to enable fast transmission speed and new services. It can also be implemented in the ultra-high frequency band ('Above 6GHz') called Wave.
- 6G mobile communication technology which is called a system after 5G communication (Beyond 5G)
- Beyond 5G in order to achieve transmission speed that is 50 times faster than 5G mobile communication technology and ultra-low latency reduced to 1/10, tera Implementations in Terahertz bands (eg, such as the 3 Terahertz (3 THz) band at 95 GHz) are being considered.
- eMBB enhanced mobile broadband
- URLLC ultra-reliable low-latency communications
- mMTC massive machine-type communications
- Beamforming and Massive MIMO to mitigate the path loss of radio waves in the ultra-high frequency band and increase the propagation distance of radio waves, with the goal of satisfying service support and performance requirements, and efficient use of ultra-high frequency resources
- numerology support multiple subcarrier interval operation, etc.
- BWP Band-Width Part
- large capacity New channel coding methods such as LDPC (Low Density Parity Check) code for data transmission and Polar Code for reliable transmission of control information, L2 pre-processing, and dedicated services specialized for specific services Standardization of network slicing that provides a network has been progressed.
- LDPC Low Density Parity Check
- NR-U New Radio Unlicensed
- UE Power Saving NR terminal low power consumption technology
- NTN non-terrestrial network
- IAB Intelligent Internet of Things
- IIoT Intelligent Internet of Things
- DAPS Dual Active Protocol Stack
- 2-step random access that simplifies the random access procedure
- RACH for Standardization in the field of air interface architecture/protocol for technologies such as NR
- an architecture eg, service based architecture, service based interface
- MEC mobile edge computing
- AR augmented reality
- VR virtual reality
- MR mixed reality
- XR extended reality
- AI artificial intelligence
- ML machine learning
- FD-MIMO Full Dimensional MIMO
- Array Antenna for guaranteeing coverage in the terahertz band of 6G mobile communication technology.
- multi-antenna transmission technologies such as large scale antennas, metamaterial-based lenses and antennas to improve coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), RIS ( Reconfigurable Intelligent Surface) technology, as well as full duplex technology to improve frequency efficiency and system network of 6G mobile communication technology, satellite, and AI (Artificial Intelligence) are utilized from the design stage and end-to-end (End-to-End) -to-End) Development of AI-based communication technology that realizes system optimization by internalizing AI-supported functions and next-generation distributed computing technology that realizes complex services beyond the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources could be the basis for
- XDD cross-division duplex
- a method performed by a terminal of a wireless communication system includes receiving, from a base station, first configuration information related to time division duplex (TDD) and second configuration information related to duplex in which some frequency resources corresponding to downlink time resources are used for uplink. ; identifying at least one valid physical random access channel (PRACH) transmission occasion based on the first configuration information and the second configuration information; and transmitting a random access preamble to the base station based on the at least one valid PRACH occasion.
- TDD time division duplex
- PRACH physical random access channel
- a method performed by a base station of a wireless communication system includes transmitting first configuration information related to TDD and second configuration information related to a duplex in which some frequency resources corresponding to downlink time resources are used for uplink to a terminal; identifying at least one valid PRACH occasion according to the first configuration information and the second configuration information; and receiving a random access preamble from the terminal based on the at least one valid PRACH occasion.
- a terminal of a wireless communication system includes a transceiver and a control unit.
- the control unit controls the transceiver to receive, from a base station, first configuration information related to TDD and second configuration information related to a duplex in which some frequency resources corresponding to downlink time resources are used for uplink, from a base station, and the first configuration information Based on the information and the second configuration information, at least one valid PRACH occasion is identified, and the transceiver unit is controlled to transmit a random access preamble to the base station based on the at least one valid PRACH occasion.
- a base station of a wireless communication system includes a transceiver and a control unit.
- the control unit controls the transceiver to transmit first configuration information related to TDD and second configuration information related to a duplex in which some frequency resources corresponding to downlink time resources are used for uplink to the terminal, and the first configuration information information and at least one valid PRACH occasion according to the second configuration information is identified, and the transmission/reception unit is controlled to receive a random access preamble from the terminal based on the at least one valid PRACH occasion.
- an XDD terminal can efficiently perform PRACH transmission.
- FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain, in a wireless communication system to which the present disclosure is applied.
- FIG. 2 is a diagram illustrating a slot structure considered in a wireless communication system to which the present disclosure is applied.
- FIG. 3 is a diagram illustrating a synchronization signal block considered in a wireless communication system to which the present disclosure is applied.
- FIG. 4 is a diagram illustrating transmission cases of a synchronization signal block in a frequency band of 6 GHz or less considered in a wireless communication system to which the present disclosure is applied.
- FIG. 5 is a diagram illustrating transmission cases of a synchronization signal block in a frequency band of 6 GHz or higher considered in a wireless communication system to which the present disclosure is applied.
- FIG. 6 is a diagram illustrating transmission cases of synchronization signal blocks according to subcarrier intervals within a 5 ms time in a wireless communication system to which the present disclosure is applied.
- FIG. 7 is a diagram illustrating a random access procedure in a wireless communication system to which the present disclosure is applied.
- FIG 8 is a diagram illustrating an example in which XDD is operated in a TDD band of a wireless communication system to which the present disclosure is applied.
- FIG. 9 is a diagram illustrating an example in which XDD is operated together with TDD in a frequency band to which the present disclosure is applied.
- FIG. 10 is a diagram illustrating an XDD terminal operation when a valid PRACH transmission time and downlink reception occur simultaneously in a wireless communication system to which the present disclosure is applied.
- FIG. 11 is a diagram illustrating a relationship between a synchronization signal block and an effective random access occasion in a wireless communication system to which the present disclosure is applied.
- FIG. 12 is a flowchart illustrating an operation of an XDD terminal in a wireless communication system according to an embodiment of the present disclosure.
- FIG. 13 is a flowchart illustrating the operation of a base station in a wireless communication system according to an embodiment of the present disclosure.
- FIG. 14 is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure.
- 15 is a diagram illustrating the structure of a base station according to an embodiment of the present disclosure.
- a base station is a subject that performs resource allocation of a terminal, and is at least one of a gNode B, an eNode B, a Node B, a base station (BS), an access point (AP), a wireless access unit, a base station controller, or a node on a network.
- the terminal may be at least one of a user equipment (UE), a mobile station (MS), a terminal, a cellular phone, a smart phone, a smart watch, a wearable device, a computer, and various multimedia devices capable of performing communication functions.
- downlink is a radio transmission path of a signal transmitted from a base station to a terminal
- uplink refers to a radio transmission path of a signal transmitted from a terminal to a base station.
- LTE or LTE-A system may be described as an example in the following, embodiments of the present disclosure may be applied to other communication systems having a similar technical background or channel type.
- 5G, new radio, NR 5th generation mobile communication technology developed after LTE-A may be included in this, and the following 5G may be a concept including existing LTE, LTE-A and other similar services there is.
- the present disclosure can be applied to other communication systems through some modifications within a range that does not greatly deviate from the scope of the present disclosure as determined by those skilled in the art.
- each block of the process flow chart diagrams and combinations of the flow chart diagrams can be performed by computer program instructions.
- These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates means to perform functions.
- These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, such that the computer usable or computer readable memory
- the instructions stored in are also capable of producing an article of manufacture containing instruction means for performing the functions described in the flowchart block(s).
- the computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to generate computer or other programmable data processing equipment. Instructions for performing processing equipment may also provide steps for performing the functions described in the flowchart block(s).
- each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative embodiments, it is possible for the functions mentioned in the blocks to occur out of order. For example, it is possible that two blocks shown in succession may in fact be performed substantially concurrently, or that the blocks may sometimes be performed in reverse order depending on their function.
- ' ⁇ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and ' ⁇ unit' refers to certain roles. carry out However, ' ⁇ part' is not limited to software or hardware. ' ⁇ bu' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Therefore, as an example, ' ⁇ unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
- FPGA Field Programmable Gate Array
- ASIC Application Specific Integrated Circuit
- components and ' ⁇ units' may be combined into smaller numbers of components and ' ⁇ units' or further separated into additional components and ' ⁇ units'.
- components and ' ⁇ units' may be implemented to play one or more CPUs in a device or a secure multimedia card.
- ' ⁇ unit' may include one or more processors.
- the wireless communication system has moved away from providing voice-oriented services in the early days and, for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e, a broadband wireless network that provides high-speed, high-quality packet data services. evolving into a communication system.
- Uplink refers to a radio link through which a terminal transmits data or a control signal to a base station
- SC-FDMA Single Carrier Frequency Division Multiple Access
- uplink refers to a radio link through which a base station transmits data or a control signal to a terminal
- the above-described multiple access scheme distinguishes data or control information of each user by assigning and operating such that time-frequency resources to carry data or control information for each user do not overlap each other, that is, to establish orthogonality. Let it be.
- the 5G communication system which is a communication system after LTE, must support services that simultaneously satisfy various requirements so that various requirements such as users and service providers can be freely reflected.
- Services considered for the 5G communication system include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra reliability low latency communication (URLLC), etc.
- eMBB aims to provide a data transmission rate that is more improved than that supported by existing LTE, LTE-A or LTE-Pro.
- an eMBB in a 5G communication system, an eMBB must be able to provide a peak data rate of 20 Gbps in downlink and a peak data rate of 10 Gbps in uplink from the viewpoint of one base station.
- the 5G communication system should provide a maximum transmission rate and, at the same time, an increased user perceived data rate of the terminal.
- various transmission/reception technologies may be improved, including a more advanced multi-input multi-output (MIMO) transmission technology.
- MIMO multi-input multi-output
- the 5G communication system uses a frequency bandwidth wider than 20 MHz in a frequency band of 3 to 6 GHz or 6 GHz or higher, thereby increasing the data transmission rate required by the 5G communication system.
- mMTC is being considered to support application services such as Internet of Things (IoT) in 5G communication systems.
- IoT Internet of Things
- mMTC requires access support for large-scale terminals within a cell, improved coverage of terminals, improved battery time, and reduced terminal cost. Since the IoT is attached to various sensors and various devices to provide a communication function, it must be able to support a large number of terminals (eg, 1,000,000 terminals/km 2 ) in a cell.
- UEs supporting mMTC are likely to be located in shadow areas that are not covered by cells, such as the basement of a building due to the nature of the service, so they require wider coverage than other services provided by the 5G communication system.
- Terminals supporting mMTC are typically composed of low-cost terminals, and since it is difficult to frequently replace batteries of terminals, a very long battery life time such as about 10 to 15 years may be required.
- URLLC it is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, remote control of robots or machinery, industrial automation, unmaned aerial vehicles, remote health care, and emergency situations. A service used for emergency alert or the like may be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy air interface latency of less than 0.5 milliseconds, and at the same time must satisfy requirements of a packet error rate of 10 -5 or less. Therefore, for a service supporting URLLC, the 5G system must provide a smaller transmit time interval (TTI) than other services, and at the same time allocate wide resources in the frequency band to secure the reliability of the communication link.
- TTI transmit time interval
- Three services of the 5G communication system (hereinafter, it can be mixed with the 5G system), that is, eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system.
- eMBB enhanced mobile broadband
- URLLC ultra-reliable and low-latency communications
- mMTC massive machine type communications
- FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain, in a wireless communication system to which the present disclosure is applied.
- the horizontal axis represents the time domain and the vertical axis represents the frequency domain.
- the basic unit of resources in the time and frequency domains is a resource element (RE, 101), which is one Orthogonal Frequency Division Multiplexing (OFDM) symbol (or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol) on the time axis. (102) and one subcarrier (103) in the frequency axis. Representing the number of subcarriers per resource block (RB) in the frequency domain (For example, 12) consecutive REs may constitute one resource block (RB, 104). In addition, representing the number of symbols per subframe in the time domain Consecutive OFDM symbols may constitute one subframe (110).
- OFDM Orthogonal Frequency Division Multiplexing
- DFT-s-OFDM discrete Fourier transform spread OFDM
- FIG. 2 is a diagram illustrating a slot structure considered in a wireless communication system to which the present disclosure is applied.
- One frame 200 may be defined as 10 ms.
- One subframe 201 may be defined as 1 ms, and thus one frame 200 may consist of a total of 10 subframes 201 .
- One subframe 201 may consist of one or a plurality of slots 202 and 203, and the number of slots 202 and 203 per one subframe 201 depends on a subcarrier space (SCS). It may be different depending on the set value of ⁇ (204, 205).
- SCS subcarrier space
- a synchronization signal block (which can be mixed with SSB, SS block, SS / PBCH block, etc.) can be transmitted for initial access of the terminal, synchronization
- the signal block may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH).
- PSS primary synchronization signal
- SSS secondary synchronization signal
- PBCH physical broadcast channel
- the terminal first obtains downlink time and frequency domain synchronization from a synchronization signal through cell search and obtains a cell ID. can be obtained
- the synchronization signal may include PSS and SSS.
- the terminal receives a PBCH transmitting a master information block (MIB) from the base station to acquire system information related to transmission and reception such as system bandwidth or related control information and basic parameter values. Based on this information, the terminal can obtain a system information block (SIB) by decoding a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH). Thereafter, the terminal exchanges identification-related information between the base station and the terminal through a random access step, and initially accesses the network through steps such as registration and authentication.
- SIB system information block
- PDCH physical downlink control channel
- PDSCH physical downlink shared channel
- the synchronization signal is a signal that is a reference signal for cell search, and is transmitted with a subcarrier interval suitable for a channel environment such as phase noise for each frequency band applied.
- the 5G base station may transmit a plurality of synchronization signal blocks according to the number of analog beams to be operated. For example, PSS and SSS may be mapped over 12 RBs and transmitted, and PBCH may be mapped over 24 RBs and transmitted. In the following, a structure in which a synchronization signal and a PBCH are transmitted in a 5G communication system will be described.
- FIG. 3 is a diagram illustrating a synchronization signal block considered in a wireless communication system to which the present disclosure is applied.
- a synchronization signal block (SS block) 300 includes a PSS 301, an SSS 303, and a broadcast channel (PBCH) 302.
- the synchronization signal block 300 may be mapped to 4 OFDM symbols 304 on the time axis.
- the PSS 301 and the SSS 303 can be transmitted in 12 RBs 305 on the frequency axis and in the first and third OFDM symbols on the time axis, respectively.
- a total of 1008 different cell IDs may be defined, and the PSS 301 may have three different values according to the physical cell ID (PCI) of the cell, and the SSS ( 303) can have 336 different values.
- PCI physical cell ID
- N (1) ID can be estimated from the SSS 303 and can have a value between 0 and 335.
- N (2) ID can be estimated from the PSS 301 and can have a value between 0 and 2.
- the UE can estimate the value of N cell ID , which is a cell ID, using a combination of N (1) ID and N (2) ID .
- the PBCH 302 transmits 24 RBs 306 on the frequency axis and 6 RBs 307 and 308 on both sides excluding 12 RBs while the SSS 303 is transmitted in the 2nd to 4th OFDM symbols of the SS block on the time axis. It can be transmitted from the included resource.
- various system information called MIB may be transmitted.
- the MIB may include information as shown in Table 2 below, and the PBCH payload and PBCH demodulation reference signal (DMRS) may include the following additional information.
- MIB :: SEQUENCE ⁇ systemFrameNumber BIT STRING(SIZE(6)), subCarrierSpacingCommon ENUMERATED ⁇ scs15or60, scs30or120 ⁇ , ssb-SubcarrierOffset INTEGER (0..15), dmrs-TypeA-Position ENUMERATED ⁇ pos2, pos3 ⁇ , pdcch-ConfigSIB1 PDCCH-ConfigSIB1, cellBarred ENUMERATED ⁇ barred, notBarred ⁇ , intraFreqReselection ENUMERATED ⁇ allowed, notAllowed ⁇ , spare BIT STRING (SIZE (1)) ⁇
- the offset of the synchronization signal block in the frequency domain can be indicated through 4 bits (ssb-SubcarrierOffset) in the MIB.
- the index of the synchronization signal block including the PBCH may be indirectly acquired through PBCH DMRS and PBCH decoding. More specifically, in the frequency band below 6 GHz, 3 bits obtained through decoding of the PBCH DMRS indicate the synchronization signal block index, and in the frequency band above 6 GHz, 3 bits obtained through decoding of the PBCH DMRS and included in the PBCH payload A total of 6 bits, including 3 bits obtained from PBCH decoding, may indicate a synchronization signal block index including the PBCH.
- - PDCCH (physical downlink control channel) information the subcarrier spacing of a common downlink control channel can be indicated through 1 bit (subCarrierSpacingCommon) in the MIB, and CORESET (control resource set) and search through 8 bits (pdcch-ConfigSIB1) Time-frequency resource configuration information of a search space (SS) may be indicated.
- subCarrierSpacingCommon 1 bit
- CORESET control resource set
- pdcch-ConfigSIB1 Time-frequency resource configuration information of a search space (SS) may be indicated.
- SFN system frame number
- 6 bits systemFrameNumber
- LSB east Significant Bit 4 bits of SFN are included in the PBCH payload so that the UE can obtain them indirectly through PBCH decoding.
- Timing information in a radio frame 1 bit (half frame) included in the above-described synchronization signal block index and PBCH payload and obtained through PBCH decoding. It can be indirectly confirmed whether it is transmitted in the second or second half frame.
- the PSS (301) In the first OFDM symbol to be transmitted, both 6 RBs 307 and 308 exist except for 12 RBs while the PSS 301 is transmitted, and the area can be used for transmitting other signals or be empty.
- All synchronization signal blocks may be transmitted using the same analog beam. That is, PSS 301, SSS 303, and PBCH 302 may all be transmitted on the same beam. Since analog beams have characteristics that cannot be applied differently in the frequency axis, the same analog beam can be applied to all frequency axis RBs within a specific OFDM symbol to which a specific analog beam is applied. For example, PSS 301, SSS 303, and four OFDM symbols through which the PBCH 302 is transmitted may all be transmitted on the same analog beam.
- FIG. 4 is a diagram illustrating various transmission cases of a synchronization signal block in a frequency band of 6 GHz or less considered in a communication system to which the present disclosure is applied.
- a subcarrier spacing (SCS) of 15 kHz (420) and a subcarrier spacing of 30 kHz (430, 440) may be used for synchronization signal block transmission in a frequency band of 6 GHz or less.
- SCS subcarrier spacing
- 30 kHz subcarrier spacing two transmission cases (case # 2 (402) and case # 3 (case # 3)) exist for the synchronization signal block. 403)) may exist.
- the synchronization signal block is maximum within 1 ms (404) time (or when one slot is composed of 14 OFDM symbols, corresponding to the length of one slot). Two can be sent.
- synchronization signal block #0 (407) and synchronization signal block #1 (408) are shown.
- synchronization signal block #0 407 may be mapped to 4 consecutive symbols from the 3rd OFDM symbol
- synchronization signal block #1 408 may be mapped to 4 consecutive symbols from the 9th OFDM symbol. can be mapped.
- Different analog beams may be applied to the synchronization signal block #0 (407) and the synchronization signal block #1 (408).
- the same beam can be applied to all 3rd to 6th OFDM symbols to which synchronization signal block #0 (407) is mapped, and the same beam is applied to all 9th to 12th OFDM symbols to which synchronization signal block #1 (408) is mapped.
- analog beams can be freely determined under the determination of which beam will be used by the base station.
- the synchronization signal block is generated within 0.5 ms (405) time (or when one slot is composed of 14 OFDM symbols, corresponding to a length of one slot) A maximum of two can be transmitted, and accordingly, a maximum of four synchronization signal blocks can be transmitted within a time of 1 ms (or 2 slots when one slot is composed of 14 OFDM symbols).
- synchronization signal block #0 (409), synchronization signal block #1 (410), synchronization signal block #2 (411), and synchronization signal block #3 (412) are 1 ms (ie, two slots). The case of transmission within time is shown.
- synchronization signal block #0 (409) and synchronization signal block #1 (410) can be mapped from the 5th OFDM symbol and the 9th OFDM symbol of the first slot, respectively, and synchronization signal block #2 (411) and Synchronization signal block #3 412 may be mapped from the third OFDM symbol and the seventh OFDM symbol of the second slot, respectively.
- Different analog beams may be applied to the synchronization signal block #0 (409), synchronization signal block #1 (410), synchronization signal block #2 (411), and synchronization signal block #3 (412).
- the same analog beam may be applied to the 3rd to 6th symbols of the second slot in which 411 is transmitted and the 7th to 10th symbols in the second slot in which synchronization signal block #3 412 is transmitted.
- an analog beam may be freely determined under the determination of which beam to be used by the base station.
- the synchronization signal block is generated within 0.5 ms (406) time (or when one slot is composed of 14 OFDM symbols, corresponding to a length of one slot) A maximum of two can be transmitted, and accordingly, a maximum of four synchronization signal blocks can be transmitted within a time of 1 ms (or 2 slots when one slot is composed of 14 OFDM symbols).
- synchronization signal block #0 413, synchronization signal block #1 414, synchronization signal block #2 415, and synchronization signal block #3 416 are 1 ms (ie, two slots). Transmission within time is shown.
- synchronization signal block #0 (413) and synchronization signal block #1 (414) can be mapped from the 3rd OFDM symbol and 9th OFDM symbol of the first slot, respectively, and are synchronized with synchronization signal block #2 (415).
- Signal block #3 416 may be mapped from the third OFDM symbol and the ninth OFDM symbol of the second slot, respectively.
- Different analog beams may be used for the synchronization signal block #0 (413), synchronization signal block #1 (414), synchronization signal block #2 (415), and synchronization signal block #3 (416).
- the same analog beam can be used in all four OFDM symbols in which each synchronization signal block is transmitted, and the base station freely determines which beam to use in OFDM symbols to which a synchronization signal block is not mapped. can be determined
- FIG. 5 is a diagram illustrating transmission cases of a synchronization signal block in a frequency band of 6 GHz or higher considered in a wireless communication system to which the present disclosure is applied.
- synchronization signal block transmission requires a subcarrier spacing of 120 kHz (530) as in case #4 (510) and a subcarrier spacing of 240 kHz (540) as in the example of case #5 (520).
- Case #4 (510) with a subcarrier spacing of 120 kHz (530), up to 4 synchronization signal blocks are transmitted within 0.25 ms (501) time (or if 1 slot consists of 14 OFDM symbols, corresponding to 2 slot lengths) It can be.
- synchronization signal block #0 (503), synchronization signal block #1 (504), synchronization signal block #2 (505), and synchronization signal block #3 (506) are performed at 0.25 ms (ie, two slots). The transmission case is shown.
- synchronization signal block #0 (503) and synchronization signal block #1 (504) can be mapped to 4 consecutive symbols from the 5th OFDM symbol of the first slot, respectively, and from the 9th OFDM symbol It can be mapped to 4 symbols, and synchronization signal block # 2 (505) and synchronization signal block # 3 (506) can each be mapped to 4 consecutive symbols from the 3rd OFDM symbol of the second slot, It can be mapped to 4 consecutive symbols from the 7th OFDM symbol.
- synchronization signal block #0 503
- synchronization signal block #1 504
- synchronization signal block #2 505
- synchronization signal block #3 synchronization signal block #3
- the same analog beam may be used in all four OFDM symbols in which each synchronization signal block is transmitted, and the base station may freely determine which beam is to be used in OFDM symbols to which a synchronization signal block is not mapped.
- Case #5 (520) at a subcarrier interval of 240 kHz (540), up to 8 synchronization signal blocks are available within 0.25 ms (502) time (or if 1 slot consists of 14 OFDM symbols, corresponding to a length of 4 slots). can be transmitted
- synchronization signal block #0 (507), synchronization signal block #1 (508), synchronization signal block #2 (509), synchronization signal block #3 (510), synchronization signal block #4 (511)
- a case in which synchronization signal block #5 (512), synchronization signal block #6 (513), and synchronization signal block #7 (514) are transmitted in 0.25 ms (ie, 4 slots) is shown.
- synchronization signal block #0 (507) and synchronization signal block #1 (508) may be mapped to 4 consecutive symbols from the 9th OFDM symbol of the first slot, respectively, and each consecutive sequence from the 13th OFDM symbol It may be mapped to 4 symbols, and synchronization signal block # 2 (509) and synchronization signal block # 3 (510) may be mapped to 4 consecutive symbols from the 3rd OFDM symbol of the second slot, respectively, It can be mapped to 4 consecutive symbols from the 7th OFDM symbol, and synchronization signal block #4 (511), synchronization signal block #5 (512), and synchronization signal block #6 (513) are each It may be mapped to 4 consecutive symbols from the th OFDM symbol, it may be mapped to 4 consecutive symbols from the 9th OFDM symbol, and it may be mapped to 4 consecutive symbols from the 13th OFDM symbol, Synchronization signal block #7 514 may be mapped to 4 consecutive symbols from the 3rd OFDM symbol of the 4th slot.
- synchronization signal block #0 507
- synchronization signal block #1 508
- synchronization signal block #2 509
- synchronization signal block #3 510
- synchronization signal block #4 511
- synchronization signal block #5 512 synchronization signal block #6 513
- synchronization signal block #7 514 synchronization signal block #7 514
- the same analog beam may be used in all four OFDM symbols in which each synchronization signal block is transmitted, and in OFDM symbols to which a synchronization signal block is not mapped, which beam to be used may be freely determined by the base station.
- FIG. 6 is a diagram illustrating transmission cases of synchronization signal blocks according to subcarrier intervals within a 5 ms time in a wireless communication system to which the present disclosure is applied.
- synchronization signal blocks may be periodically transmitted in units of 5ms (corresponding to 5 subframes or half frames, 610).
- synchronization signal blocks In a frequency band of 3 GHz or less, up to four synchronization signal blocks may be transmitted within 5 ms (610) time. In a frequency band of more than 3 GHz and less than 6 GHz, up to 8 synchronization signal blocks may be transmitted. In a frequency band exceeding 6 GHz, up to 64 synchronization signal blocks may be transmitted. As described above, subcarrier spacings of 15 kHz and 30 kHz may be used at frequencies below 6 GHz.
- Case # 1 (401) at a subcarrier interval of 15 kHz composed of one slot in FIG. 621) can be transmitted, and in a frequency band of more than 3 GHz and less than 6 GHz, synchronization signal blocks can be mapped to the first, second, third, and fourth slots, so that up to eight 622 can be transmitted.
- Case #2 (402) or Case #3 (403) at a subcarrier interval of 30 kHz composed of two slots in FIG. 631 and 641) can be transmitted, and in a frequency band of more than 3 GHz and less than 6 GHz, synchronization signal blocks can be mapped starting from the first and third slots, so that up to 8 blocks 632 and 642 can be transmitted.
- Subcarrier spacings of 120 kHz and 240 kHz may be used at frequencies above 6 GHz.
- the synchronization signal blocks are 1, 3, 5, 7, 11, 13, 15, 17, Since it can be mapped starting from the 21st, 23rd, 25th, 27th, 31st, 33rd, 35th, and 37th slots, up to 64 slots (651) can be transmitted.
- 64 slots 651 can be transmitted.
- the UE may acquire the SIB after decoding the PDCCH and the PDSCH based on the system information included in the received MIB.
- the SIB may include at least one of uplink cell bandwidth related information, random access parameters, paging parameters, and uplink power control related parameters.
- XDD Cross-Division Duplex
- the XDD utilizes some of the downlink resources as uplink resources in a time division duplex (TDD) spectrum of a frequency of 6 GHz or less or a frequency of 6 GHz or more, thereby receiving uplink transmission from the terminal as much as the increased uplink resources,
- TDD time division duplex
- This technology is capable of reducing feedback delay by expanding uplink coverage and receiving feedback about downlink transmission from a terminal in the expanded uplink resources.
- a terminal capable of receiving information on whether XDD is supported from a base station and performing uplink transmission in a part of downlink resources may be referred to as an XDD terminal for convenience.
- XDD duplex scheme in which some frequency resources corresponding to downlink time resources are used for uplink
- XDD duplex scheme in which some frequency resources corresponding to downlink time resources are used for uplink
- the scope of the present disclosure is not limited to the term “XDD”.
- the following scheme may be considered.
- frame structure type 2 In addition to the frame structure type of the existing unpaired spectrum (or time division duplex, TDD) or paired spectrum (or frequency division duplex, FDD), another frame structure type (eg frame structure type 2) is required to define the above XDD may be introduced.
- the above frame structure type 2 may be defined to be supported in the specific frequency or frequency band, or the XDD base station may indicate whether or not XDD is supported by system information to the terminal.
- the XDD terminal may determine whether XDD is supported in the specific cell (or frequency or frequency band) by receiving system information including whether or not the XDD is supported.
- Whether or not the XDD is additionally supported in a specific frequency or frequency band of an existing unpaired spectrum may be indicated without definition of a new frame structure type.
- the second scheme it may be possible to define whether the XDD is additionally supported in a specific frequency or frequency band of the existing unpaired spectrum, or the XDD base station may indicate to the terminal whether or not XDD is supported through system information.
- the XDD terminal may determine whether XDD is supported in the specific cell (or frequency or frequency band) by receiving system information including whether or not the XDD is supported.
- information on whether or not XDD is supported is a TDD UL (uplink)-DL (downlink) resource configuration indicating a downlink slot (or symbol) resource and an uplink slot (or symbol) resource of TDD
- TDD UL (uplink)-DL (downlink) resource configuration indicating a downlink slot (or symbol) resource and an uplink slot (or symbol) resource of TDD
- it may be information indirectly indicating whether XDD is supported by setting some of the downlink resources as uplink resources (for example, XDD resource configuration information in FIG. 8 described later), or directly XDD It may also be information indicating whether or not it is supported.
- the XDD terminal may obtain cell synchronization by receiving a synchronization signal block as in the embodiment of FIG. 4 or 5 in initial cell access to access a cell (or base station).
- the process of obtaining cell synchronization may be the same for an XDD terminal and an existing TDD terminal. Thereafter, the XDD terminal may determine whether the cell supports XDD through a MIB acquisition or SIB acquisition or random access process.
- the system information for transmitting the information on whether or not the XDD is supported may be separately transmitted system information that is distinguished from system information for a terminal supporting a different version of the standard within a cell (eg, an existing TDD terminal), and the XDD terminal may determine whether XDD is supported by obtaining all or part of the system information transmitted separately from the system information for the existing TDD terminal.
- the XDD terminal acquires only system information for the existing TDD terminal or acquires system information indicating that XDD is not supported, it may be determined that the cell (or base station) supports only TDD.
- the information on whether or not to support XDD is included in system information for a terminal (eg, an existing TDD terminal) supporting a standard of a different version
- the information on whether or not to support XDD has an effect on acquiring system information of the existing TDD terminal. It can be inserted at the very end. If the XDD terminal does not acquire information on whether or not to support XDD, which was inserted last, or acquires information indicating that XDD is not supported, the XDD terminal may determine that the cell (or base station) supports only TDD. .
- the XDD terminal may perform random access procedures and transmit/receive data/control signals in the same manner as the existing TDD terminal.
- the base station configures a separate random access resource for each existing TDD terminal or XDD terminal (eg, an XDD terminal supporting duplex communication and an XDD terminal supporting half-duplex communication), and for the random access resource Configuration information (control information or configuration information indicating time-frequency resources that can be used for PRACH) may be transmitted to the XDD terminal through system information.
- the system information for transmitting the information on the random access resource may be separately transmitted system information that is distinguished from system information for a terminal (eg, an existing TDD terminal) supporting a standard of a different version within a cell.
- the base station configures separate random access resources for the TDD terminal supporting the specification of different versions and the XDD terminal, so that the TDD terminal supporting the specification of the different version performs random access or the XDD terminal performs random access. It may be possible to distinguish whether
- a separate random access resource configured for the XDD terminal may be a resource determined by an existing TDD terminal to be a downlink time resource, and the XDD terminal may have an uplink resource set in a part of the frequency of the downlink time resource ( Alternatively, by performing random access through a separate random access resource), the base station may determine that a terminal attempting random access in the uplink resource is an XDD terminal.
- the base station may configure a common random access resource for all terminals within the cell without configuring a separate random access resource for the XDD terminal.
- configuration information on the random access resource may be transmitted to all terminals within a cell through system information, and an XDD terminal receiving the system information may perform random access to the random access resource.
- the XDD terminal may complete a random access process and proceed to an RRC access mode for transmitting and receiving data with a cell.
- the XDD terminal receives an upper or physical signal from the base station that can determine that some frequency resources of the downlink time resources are set as uplink resources, and performs XDD operation, for example, in the uplink resources An uplink signal may be transmitted.
- the XDD terminal determines that the cell supports XDD, whether the terminal supports XDD, whether full-duplex communication or half-duplex communication is supported, equipped (or supported) transmission or By transmitting capability information including at least one number of reception antennas to the base station, it is possible to inform the base station that the terminal trying to access is an XDD terminal.
- capability information including at least one number of reception antennas to the base station.
- half-duplex communication support is a mandatory implementation for the XDD terminal, whether or not the half-duplex communication is supported may be omitted from capability information.
- the report of the XDD terminal on the capability information may be reported to the base station through a random access process, may be reported to the base station after completing the random access process, or after proceeding to the RRC connection mode for transmitting and receiving data with a cell It may also be reported to the base station.
- the XDD terminal may support half-duplex communication in which only uplink transmission or downlink reception is performed at one time, like a conventional TDD terminal, or full-duplex communication in which both uplink transmission and downlink reception are performed at one time. Therefore, whether to support half-duplex communication or full-duplex communication can be reported by the XDD terminal to the base station through a capability report, and after the report, the base station determines whether the XDD terminal transmits/receives using half-duplex communication or full-duplex communication. It can also be set to this XDD terminal. When the XDD terminal reports the capability for the half-duplex communication to the base station, since there is generally no duplexer, a switching gap for changing the RF between transmission and reception may be required when operating in FDD or TDD. .
- a terminal may form a radio link with a network through a random access procedure based on synchronization with a network and system information obtained in a cell search process of a cell.
- a contention-based or contention-free scheme may be used.
- the UE performs cell selection and reselection, for example, when moving from the RRC_IDLE (RRC idle) state to the RRC_CONNECTED (RRC connected) state
- RRC_IDLE RRC idle
- RRC_CONNECTED RRC connected
- Non-contention-based random access may be used to reset uplink synchronization when downlink data arrives, in case of handover, or in case of location measurement. Table 3 below illustrates conditions (events) for triggering a random access procedure in a 5G system.
- FIG. 7 is a diagram illustrating a random access procedure in a wireless communication system to which the present disclosure is applied.
- the base station may transmit a synchronization signal block.
- the base station may periodically transmit a synchronization signal block using beam sweeping.
- a base station may transmit a synchronization signal block including PSS/SSS (sync signal) and PBCH (broadcast channel) signals using up to 64 different beams for 5 ms, and a plurality of synchronization signal blocks are different from each other. It can be transmitted using a beam.
- the terminal detects (selects) a synchronization signal block having an optimal beam direction (for example, a beam direction in which the received signal strength is the strongest or is greater than a predetermined threshold), and a physical random access (PRACH) associated with the detected synchronization signal block.
- a preamble may be transmitted using channel) resources.
- the terminal may transmit a random access preamble (or message 1) to the base station.
- the base station receiving the random access preamble may measure a transmission delay value between the terminal and the base station and match uplink synchronization. Specifically, the terminal may transmit a randomly selected random access preamble within a random access preamble set previously given by system information.
- the initial transmit power of the random access preamble may be determined according to a pathloss between the base station and the terminal measured by the terminal.
- the terminal may determine the transmission beam direction (or transmission beam or beam) of the random access preamble based on the synchronization signal block received from the base station and transmit the random access preamble by applying the determined transmission beam direction.
- the base station may transmit a response (random access response, RAR, or message 2) to the detected random access attempt to the terminal.
- the base station may transmit an uplink transmission timing control command to the terminal from the transmission delay value measured from the random access preamble received in step 1.
- the base station may transmit an uplink resource and a power control command to be used by the terminal as scheduling information.
- the scheduling information may include control information for the uplink transmission beam of the terminal.
- RAR is transmitted through PDSCH and may include at least one of the following information.
- step 1 701 may be performed again. If the first step is performed again, the terminal increases the transmit power of the random access preamble by a predetermined step and transmits it (this is referred to as power ramping), thereby increasing the probability of the base station receiving the random access preamble.
- the UE informs the BS of its own UE identifier (which may be referred to as UE contention resolution identity) (or if the UE already has a valid UE identifier (C-RNTI) in the cell before starting the random access procedure) If there is, the uplink information (scheduled transmission, or message 3) including the valid terminal identifier is used for the uplink data channel (physical uplink shared channel, PUSCH) allocated in the second step 702.
- the transmission timing of the uplink data channel for transmitting message 3 may follow the uplink transmission timing control command received from the base station in step 2 702. In addition, the uplink transmission timing control command for transmitting message 3 may be followed.
- Transmission power of the link data channel may be determined by considering the power control command received from the base station and the power ramping value of the random access preamble in step 2 702.
- the uplink data channel for transmitting message 3 is After transmitting the random access preamble, it may be the first uplink data signal transmitted from the terminal to the base station.
- step 4 (704) when the base station determines that the terminal has performed random access without collision with other terminals, in step 3 (703), a message including the identifier of the terminal that has transmitted uplink data (contention resolution A message (contention resolution message: CR message) or message 4 (message 4) may be transmitted to the corresponding terminal.
- a message including the identifier of the terminal that has transmitted uplink data (contention resolution A message (contention resolution message: CR message) or message 4 (message 4) may be transmitted to the corresponding terminal.
- a message including the identifier of the terminal that has transmitted uplink data (contention resolution A message (contention resolution message: CR message) or message 4 (message 4) may be transmitted to the corresponding terminal.
- UE contention resolution identity UE contention resolution identity
- the base station may transmit message 4 (CR message) including one UE ID among identifiers of multiple UEs for contention resolution.
- the terminal When the terminal receives message 4 (CR message) including its own terminal identifier in step 4 (704) from the base station (or message 3 (message 3) including terminal identifier (C-RNTI) in step 3 703) ), and in the fourth step 704, when the terminal specific control information including the CRC based on the terminal identifier (C-RNTI) is received through the PDCCH), it can be determined that random access succeeded. Therefore, among a plurality of terminals that have received the same TC-RNTI from the base station, a terminal that confirms that its terminal identifier is included in message 4 (CR message) can confirm that contention has succeeded.
- the UE may transmit HARQ-ACK/NACK indicating successful reception of message 4 to the base station through a physical uplink control channel (PUCCH).
- PUCCH physical uplink control channel
- the base station fails to receive a data signal from the terminal because data transmitted by the terminal in step 3 703 collides with data of another terminal, the base station may not transmit any more data to the terminal. Therefore, if the terminal does not receive data transmitted in the fourth step 704 from the base station for a certain period of time, it is determined that the random access procedure has failed, and the first step 701 can be resumed.
- the UE may transmit a random access preamble on the PRACH.
- a random access preamble There are 64 usable preamble sequences in each cell, and 4 long preamble formats and 9 short preamble formats can be used according to the transmission type.
- the UE generates 64 preamble sequences using a root sequence index and a cyclic shift value signaled as system information, and can randomly select one sequence to use as a preamble.
- the base station transmits configuration information for random access resources, for example, control information (or configuration information) indicating time-frequency resources that can be used for PRACH to SIB, higher layer signaling (RRC (Radio Resource Control) information), or DCI (Downlink Control Information) may be used to inform the terminal.
- a frequency resource for PRACH transmission may indicate a starting RB point of transmission to the UE, and the number of RBs used may be determined according to a preamble format transmitted through the PRACH and an applied subcarrier interval.
- the time resources for PRACH transmission include a preset PRACH setting period, a subframe index and start symbol including a PRACH transmission time (PRACH occasion, which may be mixed with transmission time), and a PRACH transmission time within a slot.
- the number and the like may be informed through a PRACH configuration index (0 to 255).
- the terminal may determine validity of the PRACH transmission times indicated by the PRACH configuration index, and determine only valid PRACH transmission times as PRACH transmission times at which the random access preamble can be transmitted.
- the PRACH configuration index random access configuration information included in the SIB, and the SSB index selected by the UE, the UE can identify time and frequency resources to transmit the random access preamble and transmit the selected sequence to the BS as a preamble.
- n SFN mod x y Subframe number Starting symbol Number of PRACH slots within a subframe number of time-domain PRACH occasions within a PRACH slot PRACH duration x y 0 0 16 One One 0 - - 0 One 0 16 One 4 0 - - 0 2 0 16 One 7 0 - - 0 3 0 16 One 9 0 - - 0 4 0 8 One One 0 - - 0 5 0 8 One 4 0 - - 0 6 0 8 One 7 0 - - 0 7 0 8 One 9 0 - - 0 8 0 4 One One 0 - - 0 9 0 4 One 4 0 - - 0 10 0 4 One 7 0 - - 0 ... ... 104 A1 One 0 1,4,7 0 2 6 2 ... ... 251 C2 One 0 2,7 0 2 2 6 252 C2 One 0 1,
- a method of determining the validity of a PRACH transmission time point through a PRACH configuration index and XDD setting for an XDD terminal to perform PRACH transmission and performing PRACH transmission through the PRACH transmission time point determined to be valid. , when the valid PRACH transmission time and downlink reception overlap, the procedure of the XDD terminal is required.
- FIG 8 is a diagram illustrating an example in which XDD is operated in a TDD band of a wireless communication system to which the present disclosure is applied.
- the upper part of FIG. 8 shows a case in which the TDD 800 operates in a specific frequency band.
- the base station indicates the downlink slot (or symbol) resource and uplink slot (or symbol) resource of the existing TDD terminal or XDD terminal and the TDD 800 TDD UL-DL resource
- signals including data/control information can be transmitted and received in downlink slots (or symbols), uplink slots (or symbols), and flexible slots (or symbols).
- the base station may configure some of the downlink resources as uplink resources 821 and utilize the uplink resources for uplink transmission of the XDD terminal.
- the information 822 on the uplink resources 821 configured for the XDD may be used as information on whether XDD is supported, and the XDD resource configuration setting information 822 is the downlink slot of the TDD 820 ( or symbol) resource and uplink slot (or symbol) resource may be additionally transmitted in addition to the configuration of TDD UL-DL resource configuration information.
- the XDD resource configuration setting information 822 may be information including at least one or more time resources of downlink slots (or symbols), uplink slots (or symbols), and flexible slots (or symbols), and time resources It may include information on frequency resources as well as information on . For example, in the entire frequency band of the TDD 820, including location information on a frequency domain consisting of some frequencies or some Physical Resource Blocks (PRBs) or a group of one or more PRBs, Time resources of the XDD resource configuration setting information 822 may be applied only to Alternatively, information on the time resources (downlink slot (or symbol), uplink slot (or symbol), information including at least one or more time resources of flexible slots (or symbols)).
- PRBs Physical Resource Blocks
- TDD terminals can transmit and receive data/control signals with the base station based on the TDD UL-DL resource configuration information, and XDD terminals can transmit and receive data/control signals with the TDD UL-DL resource configuration information and XDD resources
- Data/control signals may be transmitted/received with the base station considering all configuration setting information 822, or data/control signals may be transmitted/received with the base station considering only the XDD resource configuration setting information 822.
- FIG. 9 is a diagram illustrating an example in which XDD is operated together with TDD in a frequency band to which the present disclosure is applied.
- the base station operates the XDD 901 based on the XDD resource configuration setting information 902, and the base station and the XDD terminal data/control in uplink or downlink resources according to the XDD resource configuration setting information 902. signals can be transmitted and received.
- the TDD 900 a method for determining the validity of the PRACH transmission time point by the UE will be described.
- the PRACH transmission time is not before the synchronization signal block in the PRACH slot, and starts after N gap symbols immediately after the last synchronization signal block symbol in the PRACH slot. It is defined that the PRACH transmission point in time is effective.
- the PRACH transmission time is uplink symbols or the PRACH transmission time is not before the synchronization signal block in the PRACH slot and immediately after the last downlink symbol It is defined that a PRACH transmission time starting after N gap symbols and starting after N gap symbols right after the last synchronization signal block symbol in the PRACH slot is effective.
- Ngap may be determined based on a prearranged method according to a standard. For example, if the subcarrier spacing (SCS) of the PRACH preamble is 1.25 kHz or 5 kHz, Ngap may be determined to be 0. For example, if the SCS of the PRACH preamble is 15 kHz or 30 kHz or 60 kHz or 120 kHz, Ngap may be determined to be 2. For example, if the SCS of the PRACH preamble is 480 kHz, Ngap may be determined to be 8. For example, if the SCS of the PRACH preamble is 960 kHz, Ngap may be determined to be 16.
- SCS subcarrier spacing
- the following method may be proposed.
- the XDD terminal may determine the validity of the PRACH transmission time according to whether TDD UL-DL resource configuration information is provided. For example, when TDD UL-DL resource configuration information is not provided to the XDD UE, the PRACH transmission time is not before the synchronization signal block in the PRACH slot, and the PRACH transmission time is immediately after the last synchronization signal block symbol in the PRACH slot N gap A PRACH transmission time starting after the symbol can be defined as valid. Also, for example, when TDD UL-DL resource configuration information is provided to an XDD UE, the PRACH transmission time point is uplink symbols according to the TDD UL-DL resource configuration information or the PRACH transmission time point is the synchronization signal block in the PRACH slot.
- PRACH transmission time starting after N gap symbols immediately after the last downlink symbol according to the TDD UL-DL resource configuration information and starting after N gap symbols immediately after the last synchronization signal block symbol in the PRACH slot is valid. can The above embodiment can be applied when the XDD terminal accesses a cell supporting only TDD through system information, or when information on whether or not XDD is supported is not obtained, or when information indicating that XDD is not supported is acquired.
- the PRACH transmission time is determined according to the XDD resource configuration setting information 902 regardless of whether TDD UL-DL resource configuration information is provided. Uplink symbols or PRACH transmission time is not before the synchronization signal block in the PRACH slot, starts after N gap symbols immediately after the last downlink symbol, and starts after N gap symbols immediately after the last synchronization signal block symbol in the PRACH slot A PRACH transmission time point may be defined as valid.
- the above embodiment can be applied when the XDD terminal determines that the cell supports XDD through system information and receives the XDD resource configuration setting information 902 .
- the XDD terminal may determine the validity of the PRACH transmission time according to whether TDD UL-DL resource configuration information is provided and the XDD resource configuration setting information 902 . For example, when both the TDD UL-DL resource configuration information and the XDD resource configuration setting information 902 are not provided to the XDD terminal, the PRACH transmission time point is not in front of the synchronization signal block in the PRACH slot, and the PRACH transmission time point is the PRACH A PRACH transmission time starting after N gap symbols immediately after the last synchronization signal block symbol in a slot may be defined as valid.
- the PRACH transmission time point is uplink symbols or PRACH slots according to the provided resource configuration information
- the PRACH transmission time starting after N gap symbols immediately after the last downlink symbol according to the provided resource configuration information and starting after N gap symbols immediately after the last synchronization signal block symbol in the PRACH slot is effective.
- the PRACH transmission time points to uplink symbols and XDD resources according to the TDD UL-DL resource configuration information Uplink symbols by a union of uplink symbols according to the configuration setting information 902 or PRACH transmission time is not in front of the synchronization signal block in the PRACH slot, and downlink according to TDD UL-DL resource configuration information It starts after N gap symbols immediately after the last downlink symbol according to the intersection of symbols and downlink symbols according to the XDD resource configuration setting information 902, and after N gap symbols immediately after the last synchronization signal block symbol in the PRACH slot.
- the starting point of PRACH transmission is valid.
- the XDD terminal accesses a cell supporting only TDD through system information, or when information on whether or not XDD is supported is not obtained, or when information indicating that XDD is not supported is acquired, or when the XDD terminal accesses a cell supporting only TDD through system information. It can be applied to all cases where it is determined that the cell supports XDD and the XDD resource configuration setting information 902 is received.
- the XDD terminal determines that the PRACH transmission time point is uplink symbols according to the XDD resource configuration setting information 902. It can be determined that it is valid (922).
- the above embodiment can be applied when the XDD terminal determines that the cell supports XDD through system information and receives the XDD resource configuration setting information 902 .
- a criterion for determining validity of a random access transmission occasion may be newly defined for the XDD terminal.
- the XDD terminal may determine that the actual PRACH preamble is to be transmitted or symbols or slots intended to transmit the PRACH preamble are valid PRACH transmission times.
- the base station or cell transmits information indicating the validity of the PRACH transmission time point (eg, information indicating the location of a valid PRACH transmission time point (i.e., information on the location of slots/symbols)) to the XDD terminal. It can be indicated by upper signal (or system information).
- the base station may indicate the ratio of the effective time point among the PRACH transmission points in the upper signal (or system information), and the location of the exact point of time may be defined in the standard. For example, when indicating that the ratio is half, it may be defined that even-numbered slots among possible PRACH transmission times are valid.
- FIG. 10 is a diagram illustrating an XDD terminal operation when a valid PRACH transmission time and downlink reception occur simultaneously in a wireless communication system to which the present disclosure is applied.
- the base station operates the XDD 1001 based on the XDD resource configuration setting information 1002, and the base station and the XDD terminal data/control in uplink or downlink resources according to the XDD resource configuration setting information 1002. signals can be transmitted and received.
- FIG. 10 a valid PRACH transmission time (valid PRACH occasion) described in FIG. 9 and a downlink data/control channel in which reception is set in a specific resource (frequency, time, etc.) by a higher order signal or scheduled by a downlink control channel in advance Alternatively, a situation in which reception of downlink RSs occurs simultaneously in a specific time interval is illustrated. Since the terminal can transmit a random access preamble at the valid PRACH transmission time point, when the terminal transmits and receives based on half-duplex communication, the terminal operation may be required when the time interval at the valid PRACH transmission point and the downlink reception time interval collide. there is. In FIG. 10, downlink data colliding with a valid PRACH transmission time and a specific time interval is mainly described, but it is also possible to apply to downlink reception such as a downlink control channel/downlink RS instead of the downlink data.
- the XDD terminal reports a capability signal that supports full-duplex communication or that the base station is configured to transmit/receive through full-duplex communication.
- the XDD terminal may be instructed to receive the downlink data 1021 in a specific resource by a previously set upper signal or by a downlink control channel.
- the XDD terminal may determine that the time interval 1022 at the effective PRACH transmission time and the time interval indicated for receiving the downlink data 1021 overlap.
- the XDD terminal can receive the downlink data 1021 even in the time interval 1022 in which the valid PRACH transmission time exists.
- the XDD terminal when the XDD terminal reports a capability signal indicating that it supports half-duplex communication or reports a capability signal indicating that it supports full-duplex communication (or does not support half-duplex communication), it is configured from the base station to transmit and receive through half-duplex communication. case can be assumed.
- the XDD terminal may be instructed to receive downlink data 1021 in a specific resource by a previously set upper signal or by a downlink control channel.
- the XDD terminal may determine that the time interval 1022 at the valid PRACH transmission time and the time interval within the slot indicated to receive the downlink data 1021 overlap.
- the XDD terminal may not receive or may not expect to receive the downlink data 1021 in the slot.
- the XDD terminal may not receive or may not expect to receive the downlink data 1021 only for the overlapping symbols.
- the XDD terminal operating in half-duplex communication may need a switching period for switching RF from transmission to reception and from reception to transmission.
- a further description of the RF switching period may be defined as an N gap or an RF switching period.
- the N gap defined in TDD (1000) may be used as the minimum interval in which RF can be switched, or may be defined as a separate value.
- it is also possible to explicitly define a switching interval necessary for the XDD terminal by defining it as the RF switching interval and determine it in a standard, or receive the value as an upper signal from the base station.
- the low complexity terminal does not receive the downlink data in the slot, or You may not expect to receive it. Alternatively, the low complexity terminal may not receive or may not expect to receive the downlink data only for the overlapping symbols.
- an upper signal (or system information) instructing the XDD MS to set uplink resources in all slots and that all of the uplink resources are PRACH transmission times may be received.
- an XDD terminal supporting half-duplex communication cannot receive the downlink data in a downlink slot in which all uplink resources are set according to the above embodiment. .
- the present disclosure proposes the following methods to solve the above problems.
- the first is to configure and use uplink resources for the XDD terminal only in some downlink slots by the base station implementation. Therefore, when the XDD terminal receives the XDD resource configuration setting indicating the uplink resource setting, even if an upper signal (or system information) indicating that all uplink resources are PRACH transmission time points to the XDD terminal is received, the The XDD terminal may determine that the downlink data can be received in remaining downlink slots other than downlink slots usable for uplink transmission during the PRACH transmission time.
- the PRACH transmission time point for the XDD UE may be indicated separately from the TDD UE within the corresponding cell. For example, an upper signal (or system information) indicating a PRACH configuration index including information on the PRACH transmission time point may be separately transmitted to the XDD terminal.
- the XDD terminal determines whether to prioritize PRACH transmission time or downlink reception by the implementation of the XDD terminal. Therefore, even if uplink resources are configured for all downlink slots, downlink reception may be performed by the determination of the XDD terminal, and PRACH transmission may be performed at a valid PRACH transmission time point.
- the base station may instruct the XDD terminal with information on whether the XDD terminal prioritizes PRACH transmission time valid in a specific time resource (slot or symbol) or downlink reception.
- the information may be transmitted to the XDD terminal as a higher level signal or a system signal.
- the XDD terminal receives the signal, the XDD terminal prioritizes a valid PRACH transmission time in a specific time resource to drop reception of downlink transmission indicated or scheduled by the base station, or the base station prioritizes a valid PRACH transmission time in a specific time resource. It is possible to determine whether to receive an indicated or scheduled downlink transmission.
- the first, second, and third methods may be applied to each downlink channel/signal, respectively.
- the second method may be applied in the case of synchronization signal block reception
- the third method may be applied in the case of CSI-RS or PDCCH/PDSCH reception.
- the method to be applied for each downlink channel/signal may be defined in the standard, or the base station instructs the XDD terminal through system information, and the XDD terminal receives the information to determine which method for each downlink channel/signal. You may decide whether to apply.
- FIG. 11 is a diagram illustrating a relationship between a synchronization signal block and an effective random access occasion in a wireless communication system to which the present disclosure is applied.
- the terminal receives the synchronization signal block, and from it, Control Resource Set (CORESET) #0 (which may correspond to a control resource set index or control resource set having an ID (Identity) of 0) and Search Space#0 (which may correspond to a search space index or a search space having an ID of 0) may be set.
- the terminal may perform monitoring for the control resource set #0 assuming that the selected synchronization signal block and demodulation reference signal (DMRS) transmitted in the control resource set #0 are quasi co located (QCLed).
- DMRS demodulation reference signal
- the terminal can receive system information based on the downlink control information transmitted from the control resource set #0.
- the terminal may obtain PRACH-related configuration information for random access from the received system information.
- the UE may transmit a preamble to the base station in the PRACH based on the index of the received synchronization signal block when performing random access (eg, when the UE receives a synchronization signal block having the corresponding index).
- a base station that transmits a preamble in PRACH using a transmit beam having a QCL relationship with a receive beam) and receives a preamble from the terminal through the PRACH can obtain information about an index of a synchronization signal block selected (received) by the terminal. there is. That is, the UE transmits the PRACH preamble for random access on a random access occasion mapped to the index of the received synchronization signal block.
- each SSB# i represents the index #i of each synchronization signal block described in FIG. 4 or 5.
- N means the number of synchronization signal blocks mapped to one random access occasion, and one time interval (eg, at least one symbol interval, at least one slot interval, or at least one subframe interval, etc.) Indicates that four random access occasions are multiplexed in frequency.
- N is less than 1 (N ⁇ 1, 1101)
- a case in which four random access occasions multiplexed in the frequency domain are mapped to one synchronization signal block is shown. That is, one random access occasion is mapped with 1/4 synchronization signal blocks.
- 4 random access occasions multiplexed in the frequency domain are mapped with 4 synchronization signal blocks. That is, in this case, one random access occasion can be mapped with one synchronization signal block.
- N is greater than 1 (N>1, 1103)
- 4 random access occasions frequency multiplexed are 8 synchronization signal blocks (SSB#1 to SSB#8) (SSB in FIG. ) and a mapped case are shown. That is, in this case, one random access occasion may be mapped with two synchronization signal blocks.
- FIG. 12 is a flowchart illustrating an operation of an XDD terminal in a wireless communication system according to an embodiment of the present disclosure.
- the XDD terminal receives XDD resource configuration information from the base station, configuration information including resource information for random access, TDD cell information, valid random access occasion transmission location information, resource for configuration-based downlink signal or configuration-based uplink signal At least one of information, full-duplex communication or half-duplex communication configuration information may be received.
- the configuration information may be provided to the XDD terminal through a SIB or RRC message or DCI.
- the XDD terminal may transmit capability information of the XDD terminal including whether full-duplex communication or half-duplex communication is supported to the base station.
- the XDD terminal determines whether the cell supports only TDD or additionally supports XDD, whether the XDD terminal supports half-duplex communication or full-duplex communication, and whether the base station configures half-duplex communication or full-duplex communication.
- Validity of PRACH transmission time may be determined based on at least one.
- the XDD terminal may perform uplink signal transmission or downlink signal reception when the determined effective PRACH transmission time and downlink signal reception overlap in a time interval.
- FIG. 13 is a flowchart illustrating the operation of a base station in a wireless communication system according to an embodiment of the present disclosure.
- the base station provides the XDD terminal with XDD resource configuration information, configuration information including resource information for random access, TDD cell information, valid random access occasion transmission location information, resources for configuration-based downlink signals or configuration-based uplink signals. At least one of information, full-duplex communication or half-duplex communication configuration information may be transmitted.
- the configuration information may be provided to the terminal through a SIB or RRC message or DCI.
- the base station may receive capability information of the XDD terminal including whether full-duplex communication or half-duplex communication is supported from the XDD terminal.
- the base station may receive an uplink signal and transmit a downlink signal.
- whether the cell supports only TDD or additionally supports XDD whether the XDD terminal supports half-duplex communication or full-duplex communication, whether the base station configures half-duplex communication or full-duplex communication validity of the PRACH transmission time according to embodiments of the present invention may be determined based on at least one of The base station may perform uplink signal reception or downlink signal transmission when the determined valid PRACH transmission time and downlink signal reception overlap in a time interval.
- FIG. 14 is a diagram illustrating the structure of a terminal according to an embodiment of the present disclosure.
- a terminal 1400 may include a transceiver 1410, a processor or controller 1420, and a memory 1430.
- the terminal 1400 according to the present disclosure may operate according to the method described in the embodiments of FIGS. 8 to 11 in a wireless communication system to which the present disclosure is applied.
- components of the terminal 1400 according to an embodiment are not limited to the above-described example.
- the terminal 1400 may include more elements than the above-mentioned elements, or may include fewer elements or more elements in the case of an XDD terminal.
- the transceiver 1410, the processor 1420, and the memory 1430 may be implemented as a single chip.
- the transceiver 1410 may include a transmitter and a receiver according to another embodiment.
- the transceiver 1410 may transmit and receive signals to and from the base station.
- the signal may include control information and data.
- the transceiver 1410 may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting the frequency of a received signal.
- the transceiver 1410 may receive a signal through a wireless channel, output it to the processor 1420, and transmit the signal output from the processor 1420 through a wireless channel.
- the processor 1420 may control a series of processes in which the terminal 1400 may operate according to the above-described embodiment of the present disclosure.
- the memory 1430 may store control information or data such as transmission resource setting included in a signal obtained from the terminal 1400, and data necessary for controlling the processor 1420 and data generated when controlling the processor 1420. It may have an area for storing etc.
- 15 is a diagram illustrating the structure of a base station according to an embodiment of the present disclosure.
- a base station 1500 may include a transceiver 1510, a processor or controller 1520, and a memory 1530.
- the base station 1500 according to the present disclosure may operate according to the method described in the embodiments of FIGS. 8 to 11 in a wireless communication system to which the present disclosure is applied.
- components of the base station 1500 according to an embodiment are not limited to the above example.
- the base station 1500 may include more or fewer components than the aforementioned components.
- the transceiver 1510, the processor 1520, and the memory 1530 may be implemented as a single chip.
- the transceiver 1510 may include a transmitter and a receiver according to another embodiment.
- the transmission/reception unit 1510 may transmit/receive a signal to/from a terminal.
- the signal may include control information and data.
- the transceiver 1510 may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts its frequency.
- the transceiver 1510 may receive a signal through a wireless channel, output it to the processor 1520, and transmit the signal output from the processor 1520 through a wireless channel.
- the processor 1520 may control a series of processes so that the base station 1500 can operate according to the above-described embodiment of the present disclosure.
- the memory 1530 may store control information and data, such as transmission resource settings determined by the base station 1500, or control information and data received from the terminal, and may store data required for control by the processor 1520 and control by the processor 1520. It may have an area for storing data generated at the time of writing.
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Abstract
Description
MIB ::= SEQUENCE { systemFrameNumber BIT STRING (SIZE (6)), subCarrierSpacingCommon ENUMERATED {scs15or60, scs30or120}, ssb-SubcarrierOffset INTEGER (0..15), dmrs-TypeA-Position ENUMERATED {pos2, pos3}, pdcch-ConfigSIB1 PDCCH-ConfigSIB1, cellBarred ENUMERATED {barred, notBarred}, intraFreqReselection ENUMERATED {allowed, notAllowed}, spare BIT STRING (SIZE (1)) } |
- Initial access from RRC_IDLE; - RRC Connection Re-establishment procedure; - DL or UL data arrival during RRC_CONNECTED when UL synchronisation status is "non-synchronised"; - UL data arrival during RRC_CONNECTED when there are no PUCCH resources for SR available; - SR failure; - Request by RRC upon synchronous reconfiguration (e.g. handover); - Transition from RRC_INACTIVE; - To establish time alignment for a secondary TAG; - Request for Other SI; - Beam failure recovery; |
PRACH Configuration Index |
Preamble format | nSFN mod x= y | Subframe number | Starting symbol | Number of PRACH slots within a subframe | number of time-domain PRACH occasions within a PRACH slot | PRACH duration | |
x | y | |||||||
0 | 0 | 16 | 1 | 1 | 0 | - | - | 0 |
1 | 0 | 16 | 1 | 4 | 0 | - | - | 0 |
2 | 0 | 16 | 1 | 7 | 0 | - | - | 0 |
3 | 0 | 16 | 1 | 9 | 0 | - | - | 0 |
4 | 0 | 8 | 1 | 1 | 0 | - | - | 0 |
5 | 0 | 8 | 1 | 4 | 0 | - | - | 0 |
6 | 0 | 8 | 1 | 7 | 0 | - | - | 0 |
7 | 0 | 8 | 1 | 9 | 0 | - | - | 0 |
8 | 0 | 4 | 1 | 1 | 0 | - | - | 0 |
9 | 0 | 4 | 1 | 4 | 0 | - | - | 0 |
10 | 0 | 4 | 1 | 7 | 0 | - | - | 0 |
… | … | |||||||
104 | A1 | 1 | 0 | 1,4,7 | 0 | 2 | 6 | 2 |
… | … | |||||||
251 | C2 | 1 | 0 | 2,7 | 0 | 2 | 2 | 6 |
252 | C2 | 1 | 0 | 1,4,7 | 0 | 2 | 2 | 6 |
253 | C2 | 1 | 0 | 0,2,4,6,8 | 0 | 2 | 2 | 6 |
254 | C2 | 1 | 0 | 0,1,2,3,4,5,6,7,8,9 | 0 | 2 | 2 | 6 |
255 | C2 | 1 | 0 | 1,3,5,7,9 | 0 | 2 | 2 | 6 |
Claims (15)
- 무선 통신 시스템의 단말에 의해 수행되는 방법에 있어서,TDD (time division duplex)와 관련된 제1 설정 정보 및 하향링크 시간 자원에 상응하는 일부 주파수 자원이 상향링크를 위해 사용되는 듀플렉스(duplex)와 관련된 제2 설정 정보를 기지국으로부터 수신하는 단계;상기 제1 설정 정보 및 상기 제2 설정 정보에 기반하여, 적어도 하나의 유효한 PRACH (physical random access channel) 전송 시점(occasion)을 식별하는 단계; 및상기 적어도 하나의 유효한 PRACH occasion에 기반하여 랜덤 엑세스 프리앰블을 상기 기지국으로 전송하는 단계를 포함하는 방법.
- 제1항에 있어서,상기 적어도 하나의 유효한 PRACH occasion은,상기 제1 설정 정보에 따른 적어도 하나의 상향링크 심볼과 상기 제2 설정 정보에 따른 적어도 하나의 상향링크 심볼의 합집합(union)으로 결정되는 적어도 하나의 상향링크 심볼 내의 PRACH occasion을 포함하는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 적어도 하나의 유효한 PRACH occasion은,PRACH 슬롯(slot) 내에서 동기화 신호 블록 앞에 있지 않고, 상기 제1 설정 정보에 따른 적어도 하나의 하향링크 심볼과 상기 제2 설정 정보에 따른 적어도 하나의 하향링크 심볼의 교집합(intersection)으로 결정되는 적어도 하나의 하향링크 심볼의 마지막 하향링크 심볼부터 기결정된 심볼 구간 이후에 시작하며, 마지막 동기화 신호 블록 심볼부터 상기 기결정된 심볼 구간 이후에 시작하는 PRACH occasion을 포함하는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 적어도 하나의 유효한 PRACH occasion 및 하향링크 스케쥴링 간의 우선순위에 대한 제3 설정 정보를 상기 기지국으로부터 수신하는 단계; 및상기 적어도 하나의 유효한 PRACH occasion 및 상기 하향링크 스케쥴링이 충돌하는 경우, 상기 제3 설정 정보에 기반하여, 상기 랜덤 엑세스 프리앰블을 전송할지 또는 상기 하향링크 스케쥴링에 따른 하향링크 신호를 수신할지 여부를 결정하는 단계를 더 포함하는 방법.
- 무선 통신 시스템의 기지국에 의해 수행되는 방법에 있어서,TDD (time division duplex)와 관련된 제1 설정 정보 및 하향링크 시간 자원에 상응하는 일부 주파수 자원이 상향링크를 위해 사용되는 듀플렉스(duplex)와 관련된 제2 설정 정보를 단말로 전송하는 단계;상기 제1 설정 정보 및 상기 제2 설정 정보에 따른 적어도 하나의 유효한 PRACH (physical random access channel) 전송 시점(occasion)을 식별하는 단계; 및상기 적어도 하나의 유효한 PRACH occasion에 기반하여 랜덤 엑세스 프리앰블을 상기 단말로부터 수신하는 단계를 포함하는 방법.
- 제5항에 있어서,상기 적어도 하나의 유효한 PRACH occasion은,상기 제1 설정 정보에 따른 적어도 하나의 상향링크 심볼과 상기 제2 설정 정보에 따른 적어도 하나의 상향링크 심볼의 합집합(union)으로 결정되는 적어도 하나의 상향링크 심볼 내의 PRACH occasion을 포함하는 것을 특징으로 하는 방법.
- 제5항에 있어서,상기 적어도 하나의 유효한 PRACH occasion은,PRACH 슬롯(slot) 내에서 동기화 신호 블록 앞에 있지 않고, 상기 제1 설정 정보에 따른 적어도 하나의 하향링크 심볼과 상기 제2 설정 정보에 따른 적어도 하나의 하향링크 심볼의 교집합(intersection)으로 결정되는 적어도 하나의 하향링크 심볼의 마지막 하향링크 심볼부터 기결정된 심볼 구간 이후에 시작하며, 마지막 동기화 신호 블록 심볼부터 상기 기결정된 심볼 구간 이후에 시작하는 PRACH occasion을 포함하는 것을 특징으로 하는 방법.
- 제5항에 있어서,상기 적어도 하나의 유효한 PRACH occasion 및 하향링크 스케쥴링 간의 우선순위에 대한 제3 설정 정보를 상기 단말로 전송하는 단계; 및상기 적어도 하나의 유효한 PRACH occasion 및 상기 하향링크 스케쥴링이 충돌하는 경우, 상기 제3 설정 정보에 따라, 상기 랜덤 엑세스 프리앰블을 수신할지 또는 상기 하향링크 스케쥴링에 따른 하향링크 신호를 전송할지 여부를 결정하는 단계를 더 포함하는 방법.
- 무선 통신 시스템의 단말에 있어서,송수신부; 및TDD (time division duplex)와 관련된 제1 설정 정보 및 하향링크 시간 자원에 상응하는 일부 주파수 자원이 상향링크를 위해 사용되는 듀플렉스(duplex)와 관련된 제2 설정 정보를 기지국으로부터 수신하도록 상기 송수신부를 제어하고, 상기 제1 설정 정보 및 상기 제2 설정 정보에 기반하여, 적어도 하나의 유효한 PRACH (physical random access channel) 전송 시점(occasion)을 식별하고, 상기 적어도 하나의 유효한 PRACH occasion에 기반하여 랜덤 엑세스 프리앰블을 상기 기지국으로 전송하도록 상기 송수신부를 제어하는 제어부를 포함하는 단말.
- 제9항에 있어서,상기 적어도 하나의 유효한 PRACH occasion은,상기 제1 설정 정보에 따른 적어도 하나의 상향링크 심볼과 상기 제2 설정 정보에 따른 적어도 하나의 상향링크 심볼의 합집합(union)으로 결정되는 적어도 하나의 상향링크 심볼 내의 PRACH occasion을 포함하는 것을 특징으로 하는 단말.
- 제9항에 있어서,상기 적어도 하나의 유효한 PRACH occasion은,PRACH 슬롯(slot) 내에서 동기화 신호 블록 앞에 있지 않고, 상기 제1 설정 정보에 따른 적어도 하나의 하향링크 심볼과 상기 제2 설정 정보에 따른 적어도 하나의 하향링크 심볼의 교집합(intersection)으로 결정되는 적어도 하나의 하향링크 심볼의 마지막 하향링크 심볼부터 기결정된 심볼 구간 이후에 시작하며, 마지막 동기화 신호 블록 심볼부터 상기 기결정된 심볼 구간 이후에 시작하는 PRACH occasion을 포함하는 것을 특징으로 하는 단말.
- 제9항에 있어서,상기 제어부는,상기 적어도 하나의 유효한 PRACH occasion 및 하향링크 스케쥴링 간의 우선순위에 대한 제3 설정 정보를 상기 기지국으로부터 수신하도록 상기 송수신부를 제어하고, 상기 적어도 하나의 유효한 PRACH occasion 및 상기 하향링크 스케쥴링이 충돌하는 경우, 상기 제3 설정 정보에 기반하여, 상기 랜덤 엑세스 프리앰블을 전송할지 또는 상기 하향링크 스케쥴링에 따른 하향링크 신호를 수신할지 여부를 결정하는 것을 특징으로 하는 단말.
- 무선 통신 시스템의 기지국에 있어서,송수신부; 및TDD (time division duplex)와 관련된 제1 설정 정보 및 하향링크 시간 자원에 상응하는 일부 주파수 자원이 상향링크를 위해 사용되는 듀플렉스(duplex)와 관련된 제2 설정 정보를 단말로 전송하도록 상기 송수신부를 제어하고, 상기 제1 설정 정보 및 상기 제2 설정 정보에 따른 적어도 하나의 유효한 PRACH (physical random access channel) 전송 시점(occasion)을 식별하고, 상기 적어도 하나의 유효한 PRACH occasion에 기반하여 랜덤 엑세스 프리앰블을 상기 단말로부터 수신하도록 상기 송수신부를 제어하는 제어부를 포함하는 기지국.
- 제13항에 있어서,상기 적어도 하나의 유효한 PRACH occasion은,상기 제1 설정 정보에 따른 적어도 하나의 상향링크 심볼과 상기 제2 설정 정보에 따른 적어도 하나의 상향링크 심볼의 합집합(union)으로 결정되는 적어도 하나의 상향링크 심볼 내의 PRACH occasion, 또는 PRACH 슬롯(slot) 내에서 동기화 신호 블록 앞에 있지 않고, 상기 제1 설정 정보에 따른 적어도 하나의 하향링크 심볼과 상기 제2 설정 정보에 따른 적어도 하나의 하향링크 심볼의 교집합(intersection)으로 결정되는 적어도 하나의 하향링크 심볼의 마지막 하향링크 심볼부터 기결정된 심볼 구간 이후에 시작하며, 마지막 동기화 신호 블록 심볼부터 상기 기결정된 심볼 구간 이후에 시작하는 PRACH occasion을 포함하는 것을 특징으로 하는 기지국.
- 제13항에 있어서,상기 제어부는,상기 적어도 하나의 유효한 PRACH occasion 및 하향링크 스케쥴링 간의 우선순위에 대한 제3 설정 정보를 상기 단말로 전송하도록 상기 송수신부를 제어하고, 상기 적어도 하나의 유효한 PRACH occasion 및 상기 하향링크 스케쥴링이 충돌하는 경우, 상기 제3 설정 정보에 따라, 상기 랜덤 엑세스 프리앰블을 수신할지 또는 상기 하향링크 스케쥴링에 따른 하향링크 신호를 전송할지 여부를 결정하는 것을 특징으로 하는 기지국.
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KR20210040703A (ko) * | 2019-10-04 | 2021-04-14 | 삼성전자주식회사 | 무선 통신 시스템에서 신호를 송수신하는 방법 및 장치 |
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