WO2022124770A1 - 테라헤르츠 대역 기반 통신 환경에 적합한 프레임 구조 - Google Patents
테라헤르츠 대역 기반 통신 환경에 적합한 프레임 구조 Download PDFInfo
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Definitions
- the present invention relates to a design and apparatus for a frame structure necessary for wireless communication in a terahertz band.
- 5G 5th-generation
- connected devices which are on an explosive increase, will be connected to the communication network.
- things connected to the network may include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction machines, and factory equipment.
- Mobile devices are expected to evolve into various form factors such as augmented reality glasses, virtual reality headsets, and hologram devices.
- 6G 6th-generation
- efforts are being made to develop an improved 6G communication system to provide various services by connecting hundreds of billions of devices and things. For this reason, the 6G communication system is called a system after 5G communication (Beyond 5G).
- the maximum transmission speed is tera (that is, 1,000 gigabytes) bps
- the wireless latency is 100 microseconds ( ⁇ sec). That is, the transmission speed in the 6G communication system is 50 times faster than in the 5G communication system, and the wireless delay time is reduced by one-tenth.
- 6G communication systems use the terahertz band (for example, the 95 gigahertz (95 GHz) to 3 terahertz (3 THz) band). implementation is being considered.
- the terahertz band compared to the millimeter wave (mmWave) band introduced in 5G, the importance of technology that can guarantee the signal reach, that is, the coverage, is expected to increase due to more severe path loss and atmospheric absorption.
- mmWave millimeter wave
- the next hyper-connected experience (the next hyper-connected) through the hyper-connectivity of the 6G communication system, which includes not only the connection between things but also the connection between people and things experience) is expected to become possible.
- the 6G communication system is expected to provide services such as true immersive extended reality (XR), high-fidelity mobile hologram, and digital replica.
- services such as remote surgery, industrial automation, and emergency response through security and reliability enhancement are provided through the 6G communication system, so it is applied in various fields such as industry, medical care, automobiles, and home appliances.
- the present disclosure proposes a frame structure suitable for a terahertz band and a signal transmission/reception method using the frame structure.
- the invention of the present disclosure for solving the above problem, in a method performed by a base station of a communication system, comprising: checking a subcarrier spacing for transmitting and receiving a signal with a terminal; transmitting a signal including information indicating at least one of whether additional symbols are allocated or the number of additional symbols to the terminal; generating data allocation information for data based on the allocation of the additional symbols; and transmitting the data allocation information and the data to the terminal, wherein the additional symbol is allocated to a predetermined position of a first slot every 0.5 ms boundary.
- a method performed by a terminal of a communication system comprising: checking a subcarrier spacing for transmitting and receiving a signal with a base station; receiving a signal including information indicating at least one of whether additional symbols are allocated or the number of additional symbols from the base station; receiving data allocation information for data from the base station; and receiving the data on the additional symbol from the base station based on the data allocation information, wherein the additional symbol is allocated to a predetermined position of a first slot every 0.5 ms boundary.
- the transceiver In addition, in the base station of the communication system, the transceiver; And check subcarrier spacing for transmitting and receiving signals with the terminal, and transmit a signal including information indicating at least one of whether or not an additional symbol is allocated or the number of additional symbols to the terminal, and the additional symbol a controller for generating data allocation information for data based on allocation, and controlling to transmit the data allocation information and the data to the terminal, wherein the additional symbol is a predetermined position of a first slot every 0.5 ms boundary It is characterized in that it is assigned to
- the transceiver in the terminal of the communication system, the transceiver; and a signal including information indicating at least one of whether an additional symbol is allocated or the number of additional symbols from the base station is checked, and data is received from the base station.
- a control unit for receiving data allocation information for , and controlling to receive the data on the additional symbol based on the data allocation information from the base station, wherein the additional symbol is a predetermined position of a first slot every 0.5 ms boundary It is characterized in that it is assigned to
- FIG. 1 is a diagram illustrating a transmission structure of a time-frequency domain, which is a radio resource domain of a 5G or NR system.
- FIG. 2 is a diagram illustrating a PDCCH 201 that is a downlink physical channel through which DCI of an LTE system is transmitted.
- 3 is a diagram illustrating an example of a basic unit of time and frequency resources constituting a downlink control channel that can be used in a 5G system.
- CORESET control resource set
- FIG. 5 is a diagram illustrating an example in which a data channel is transmitted and received.
- 6A is a diagram showing an example of a frame structure of an NR system.
- 6B is a diagram illustrating an example of the length of a symbol when the SCS is extended.
- FIG. 7 is a diagram illustrating an example of an OFDM symbol when the SCS is extended to 15 kHz ⁇ 2 n .
- 8A is a diagram illustrating an example of a structure of a first symbol every 0.5 ms of the present disclosure.
- FIG. 9 is a diagram illustrating an example of an operation performed by a base station when an additional symbol is allocated.
- FIG. 10 is a diagram illustrating an example of an operation performed by a terminal when additional symbols are allocated.
- FIG. 11 is a diagram illustrating an example of a frame structure using a sample remaining every 0.5 ms as an auxiliary sequence.
- FIG. 12 is a diagram illustrating an example of an operation of a base station when an auxiliary sequence is transmitted/received every 0.5 ms according to the value of n.
- FIG. 13 is a diagram illustrating an example of an operation of a terminal when an auxiliary sequence is transmitted/received every 0.5 ms according to the value of n.
- FIG. 14 is a diagram illustrating an example of allocation of additional symbols and auxiliary symbols according to each SCS.
- 15 is a diagram illustrating an example of slot alignment.
- 16 is a diagram showing an example of a frame structure that satisfies condition A, condition B, and condition C;
- 17 is a diagram showing an example of a frame structure that satisfies condition A, condition B, condition C, and condition D;
- condition 18 is a diagram showing an example of a frame structure that satisfies condition A, condition C, and condition D;
- condition A is a diagram showing another example of a frame structure that satisfies condition A, condition C, and condition D;
- 20 is a diagram showing another example of a frame structure that satisfies condition A, condition C, and condition D;
- 21 is a diagram showing another example of a frame structure that satisfies condition A, condition C, and condition D;
- condition A is a diagram showing another example of a frame structure that satisfies condition A, condition C, and condition D;
- condition A is a diagram showing another example of a frame structure that satisfies condition A, condition C, and condition D;
- 24 is a diagram showing another example of a frame structure that satisfies condition A, condition C, and condition D;
- 25 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present invention.
- 26 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present invention.
- a wireless communication system 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 HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE 802.16e, such as communication standards such as broadband wireless broadband wireless providing high-speed, high-quality packet data service It is evolving into a communication system.
- HSPA High Speed Packet Access
- LTE-A Long Term Evolution-A
- LTE-Pro LTE-Pro
- 3GPP2 HRPD High Rate Packet Data
- UMB Ultra Mobile Broadband
- IEEE 802.16e such as communication standards such as broadband wireless broadband wireless providing high-speed, high-quality packet data service It is evolving into a communication system.
- an Orthogonal Frequency Division Multiplexing (OFDM) scheme is employed in downlink (DL), and single carrier frequency division multiple access (SC-FDMA) in uplink (UL). ) method is used.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA single carrier frequency division multiple access
- 5G system or NR (new radio) system
- CP-OFDM Cyclic-Prefix OFDM
- DFT-S-OFDM Discrete Fourier Transform Spreading OFDM
- a UE transmits a base station (gNB; gNode B or eNB; eNode B or BS); It refers to a radio link that transmits data or control signals to a base station or radio access unit, a base station controller, or one of nodes on a network, which is a subject that performs resource allocation of a terminal).
- gNB base station
- eNode B or BS base station
- the data or control information of each user is divided by allocation and operation so that the time-frequency resources to which the data or control information is transmitted for each user do not overlap, that is, orthogonality is established. make it possible
- the 5G communication system which is a future communication system after LTE, must be able to freely reflect various requirements such as users and service providers, services that simultaneously satisfy various requirements must be supported.
- Services considered for the 5G communication system include enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mNTC), and Ultra Reliability Low Latency Communication (URLLC). There is this.
- the eMBB aims to provide more improved data transfer rates than the data transfer rates supported by existing LTE, LTE-A or LTE-Pro.
- the eMBB in the 5G communication system, the eMBB must be able to provide a maximum data rate of 20 Gbps in the downlink and a maximum data rate of 10 Gbps in the uplink from the viewpoint of one base station.
- the 5G communication system must provide the maximum transmission speed and at the same time provide the increased user perceived data rate of the terminal. In order to satisfy such a requirement, it is required to improve various transmission/reception technologies, including a more advanced multi-antenna (MIMO) transmission technology.
- MIMO multi-antenna
- 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 more. Data transfer speed can be satisfied.
- mMTC is being considered to support application services such as the Internet of Things (IoT) in the 5G communication system.
- IoT Internet of Things
- mMTC requires large-scale terminal access support within a cell, improved terminal coverage, improved battery life, and reduced terminal cost. Since the Internet of Things is attached to various sensors and various devices to provide communication functions, it must be able to support a large number of terminals (eg, 1,000,000 terminals/km 2 ) within a cell.
- terminals supporting mMTC are highly likely to be located in shaded areas not covered by cells, such as basements of buildings, due to the characteristics of the service, wider coverage is required compared to other services provided by the 5G communication system.
- a terminal supporting mMTC should be configured as a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time such as 10 to 15 years is required.
- URLLC it is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, remote control of a robot or machine, industrial automation, unmanned aerial vehicle, remote health care, emergency situation A service used for an emergency alert, etc. 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 an air interface latency of less than 0.5 milliseconds, and at the same time has a requirement of a packet error rate of 10 -5 or less.
- the 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, it is a design that must allocate wide resources in the frequency band to secure the reliability of the communication link. matters are required
- TTI Transmit Time Interval
- the three services of the 5G system ie, eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system.
- different transmission/reception techniques and transmission/reception parameters may be used between services to satisfy different requirements of each service.
- 5G systems to achieve higher data rates and ultra-low latency (beyond 5G)_systems, or 6G systems, are being studied.
- FIG. 1 is a diagram illustrating a transmission structure of a time-frequency domain, which is a radio resource domain of a 5G or NR system.
- a horizontal axis indicates a time domain and a vertical axis indicates a frequency domain.
- the minimum transmission unit in the time domain is an OFDM symbol, and N symb OFDM symbols 122 are gathered to form one slot 126 .
- the length of the subframe may be defined as 1.0 ms, and the radio frame 114 may be defined as 10 ms.
- the minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth may be composed of a total of N BW subcarriers 124 . However, these specific numerical values may be variably applied depending on the system.
- the basic unit of the time-frequency resource region is a resource element (RE) 112 and may be represented by an OFDM symbol index and a subcarrier index.
- a resource block (RB) 108 may be defined as N RB consecutive subcarriers 110 in the frequency domain.
- the minimum transmission unit of data is an RB unit.
- the data rate increases in proportion to the number of RBs scheduled for the UE.
- the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other.
- the channel bandwidth represents an RF bandwidth corresponding to a system transmission bandwidth.
- Table 1 is a table showing the correspondence between the system transmission bandwidth, the channel bandwidth, and the subcarrier spacing (SCS; subcarrier spacing) in the 5G or NR system.
- SCS subcarrier spacing
- DCI downlink control information
- DCI scheduling information for downlink data or uplink data is transmitted from the base station to the terminal through DCI.
- DCI is defined in various formats, whether it is scheduling information for uplink data or scheduling information for downlink data, whether it is a compact DCI with a small size of control information, and spatial multiplexing using multiple antennas is applied. It operates by applying a DCI format determined according to whether or not it is DCI for power control.
- DCI format 1 which is scheduling control information for downlink data, is configured to include at least the following control information.
- Type 0 allocates resources in a RBG (resource block group) unit by applying a bitmap method.
- a basic unit of scheduling in the LTE system is a resource block (RB) expressed by time and frequency domain resources, and the RBG is composed of a plurality of RBs to become a basic unit of scheduling in the type 0 scheme.
- Type 1 allows to allocate a specific RB within an RBG.
- - Resource block assignment Notifies the RB allocated for data transmission.
- the resource to be expressed is determined according to the system bandwidth and resource allocation method.
- MCS Modulation and Coding Scheme
- Hybrid automatic repeat request process number Notifies the process number of HARQ.
- New data indicator Notifies whether HARQ initial transmission or retransmission.
- TPC Transmit Power Control command for PUCCH (physical uplink control channel)
- PUCCH Physical uplink control channel
- the DCI is transmitted through a physical downlink control channel (PDCCH) that is a downlink physical control channel through channel coding and modulation.
- PDCCH physical downlink control channel
- a cyclic redundancy check (CRC) bit is added to the DCI message payload, and the CRC bit is scrambled with a radio network temporary identifier (RNTI) corresponding to the identity of the UE.
- RNTI radio network temporary identifier
- Different RNTIs are used according to the purpose of the DCI message, for example, UE-specific data transmission, a power control command, or a random access response. That is, the RNTI is not explicitly transmitted, but is transmitted while being included in the CRC calculation process.
- the UE Upon receiving the DCI message transmitted on the PDCCH, the UE checks the CRC using the assigned RNTI. If the CRC check result is correct, it can be seen that the corresponding message has been transmitted to the UE.
- FIG. 2 is a diagram illustrating a PDCCH 201 that is a downlink physical channel through which DCI of an LTE system is transmitted.
- the PDCCH 201 is time-multiplexed with the PDSCH 202, which is a data transmission channel, and is transmitted over the entire system bandwidth.
- the area of the PDCCH 201 is expressed by the number of OFDM symbols, which is indicated to the UE by a control format indicator (CFI) transmitted through a physical control format indicator channel (PCFICH).
- CFI control format indicator
- PCFICH physical control format indicator channel
- One PDCCH carries one DCI message, and since a plurality of terminals can be simultaneously scheduled for downlink and uplink, a plurality of PDCCHs are simultaneously transmitted in each cell.
- a cell-specific reference signal (CRS) 203 is used as a reference signal for decoding the PDCCH 201 .
- the CRS 203 is transmitted in every subframe over the entire band, and scrambling and resource mapping of the CRS are changed according to a cell ID (identity). Since the CRS 203 is a reference signal commonly used by all terminals, terminal-specific beamforming cannot be used. Therefore, the multi-antenna transmission method for the PDCCH of the LTE system is limited to open-loop transmission diversity.
- the number of ports of the CRS is implicitly known to the UE from decoding of a physical broadcast channel (PBCH).
- PBCH physical broadcast channel
- Resource allocation of the PDCCH 201 is based on a control channel element (CCE), and one CCE consists of 9 resource element groups (REGs), that is, a total of 36 resource elements (REs).
- the number of CCEs required for a specific PDCCH 201 may be 1, 2, 4, or 8, depending on the channel coding rate of the DCI message payload. As described above, the number of different CCEs is used to implement link adaptation of the PDCCH 201 .
- the UE needs to detect a signal without knowing information about the PDCCH 201.
- a search space indicating a set of CCEs is defined for blind decoding.
- the search space consists of a plurality of candidate sets for each aggregation level (AL) of each CCE, which is not explicitly signaled but is implicitly defined through a function and a subframe number by a UE identity.
- A aggregation level
- the UE performs decoding on the PDCCH 201 for all possible resource candidates that can be made from CCEs in the configured search space, and information declared valid for the UE through CRC verification. to process
- the search space is classified into a terminal-specific search space and a common search space.
- a group of terminals or all terminals may search the common search space of the PDCCH 201 to receive cell-common control information such as dynamic scheduling or paging messages for system information. For example, scheduling allocation information of a DL-SCH for transmission of a system information block (SIB)-1 including operator information of a cell may be received by examining the common search space of the PDCCH 201 .
- SIB system information block
- the entire PDCCH region is composed of a set of CCEs in the logical region, and a search space composed of the set of CCEs exists.
- the search space is divided into a common search space and a UE-specific search space, and the search space for the LTE PDCCH is defined as follows.
- the set of PDCCH candidates to monitor are defined in terms of search spaces, where a search space at aggregation level is defined by a set of PDCCH candidates.
- the CCEs corresponding to PDCCH candidate m of the search space are given by
- i 0, ... , L-1 .
- m' m.
- M (L) is the number of PDCCH candidates to monitor in the given search space.
- variable is defined by
- n s is the slot number within a radio frame.
- n RNTI The RNTI value used for n RNTI is defined in subclause 7.1 in downlink and subclause 8 in uplink.
- the search space is a set of candidate control channels composed of CCEs that the UE should attempt to decode on a given aggregation level. It has two search spaces.
- the number of PDCCH candidates to be monitored by the UE in the search space defined according to the aggregation level is defined in Table 2 below.
- the aggregation level ⁇ 1, 2, 4, 8 ⁇ is supported, and in this case, ⁇ 6, 6, 2, 2 ⁇ PDCCH candidates are each.
- an aggregation level ⁇ 4, 8 ⁇ is supported, and in this case, it has ⁇ 4, 2 ⁇ PDCCH candidate groups, respectively.
- the reason why the common search space supports only the aggregation level of ⁇ 4, 8 ⁇ is to improve the coverage characteristics because the system message generally has to reach the cell edge.
- DCI transmitted in the common search space is defined only for a specific DCI format, such as 0, 1A, 3, 3A, or 1C, which is used for a system message or power control for a UE group.
- DCI format with spatial multiplexing is not supported in the common search space.
- the downlink DCI format to be decoded in the UE-specific search space varies according to a transmission mode configured for the corresponding UE. Since the setting of the transmission mode is made through RRC (radio resource control) signaling, the exact subframe number for whether the setting is effective for the corresponding terminal is not specified. Accordingly, the terminal can be operated so as not to lose communication by always performing decoding on DCI format 1A regardless of the transmission mode.
- the basic unit (REG) of time and frequency resources constituting the control channel consists of 1 OFDM symbol 301 on the time axis, and 12 subcarriers 302 on the frequency axis, that is, 1 RB. Consists of.
- the data channel and the control channel can be time-multiplexed within one subframe by assuming that the time axis basic unit is 1 OFDM symbol 301 .
- the user's processing time can be reduced, so it is easy to satisfy the latency requirement.
- frequency multiplexing between the control channel and the data channel can be performed more efficiently.
- control channel regions of various sizes can be set.
- a basic unit to which a downlink control channel is allocated in a 5G system is referred to as a CCE 304
- one CCE 304 may include a plurality of REGs 303 .
- the REG 303 may be composed of 12 REs, and if 1 CCE 304 is composed of 6 REGs 303, then 1 CCE 304 is It means that it can be composed of 72 REs.
- the corresponding region may consist of a plurality of CCEs 304, and a specific downlink control channel may be mapped and transmitted to one or more CCEs 304 according to the aggregation level in the control region.
- the CCEs 304 in the control area are divided by numbers, and in this case, numbers may be assigned according to a logical mapping method.
- the basic unit of the downlink control channel shown in FIG. 3 may include both REs to which DCI is mapped and a region to which a demodulation reference signal (DMRS) 305, which is a reference signal for decoding them, is mapped.
- DMRS 305 may be transmitted in 6 REs within 1 REG 303 .
- the terminal can decode the control information without information about which precoding the base station has applied.
- control region #1 401 within a system bandwidth 410 on the frequency axis and one slot 420 on the time axis (in the example of FIG. 4, one slot is assumed to be 7 OFDM symbols).
- control area #2 402
- the control regions 401 and 402 may be set to a specific subband 403 within the entire system bandwidth 410 on the frequency axis.
- control region length control resource set duration, 404).
- the control region #1 401 is set to a control region length of 2 symbols
- the control region #2 402 is set to a control region length of 1 symbol.
- the control region in the 5G system described above may be configured by the base station to the terminal through higher layer signaling (eg, system information, master information block (MIB), RRC signaling).
- Setting the control region to the terminal means providing information such as the location of the control region, subbands, resource allocation of the control region, control region length, and the like.
- the control area setting information may include information in Table 3 below.
- Frequency axis RB allocation information - Setting information 2.
- Control area start symbol - Setting information 3.
- Control area symbol length - Setting information 4.
- REG bundling size (2 or 3 or 6) - Setting information 5.
- Transmission mode Interleaved transmission method or Non-interleaved transmission method
- DMRS setting information Precoder granularity
- Search space type common search space, group-common search space, terminal-specific search space
- Setting information 8. DCI format to be monitored in the corresponding control area - etc.
- various pieces of information necessary for transmitting the downlink control channel may be configured for the terminal.
- DCI downlink control information
- scheduling information for uplink data (or PUSCH; physical uplink shared channel) or downlink data (or PDSCH; physical downlink shared channel) is transmitted from the base station to the terminal through DCI.
- the UE may monitor a DCI format for fallback and a DCI format for non-fallback for PUSCH or PDSCH.
- the DCI format for countermeasures may consist of a field fixed between the base station and the terminal, and the DCI format for non-prevention may include a configurable field.
- Countermeasure DCI for scheduling PUSCH may include, for example, the following information.
- Non-preparation DCI for scheduling PUSCH may include, for example, the following information.
- ⁇ 0 bit if only resource allocation type 0 is configured (0 bit when resource allocation type 0 is set); ⁇ 1 bit otherwise.
- - Modulation and coding scheme 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits as defined in section xx of [6, TS38.214] - HARQ process number - 4 bits - 1st downlink assignment index (first downlink assignment index) - 1 or 2 bits ⁇ 1 bit for semi-static HARQ-ACK codebook (1 bit for semi-static HARQ-ACK codebook); ⁇ 2 bits for dynamic HARQ-ACK codebook with single HARQ-ACK codebook (2 bits for single HARQ-ACK codebook and dynamic HARQ-ACK codebook).
- - 2nd downlink assignment index (second downlink assignment index) - 0 or 2 bits ⁇ 2 bits for dynamic HARQ-ACK codebook with two HARQ-ACK sub-codebooks (2 bits for two HARQ-ACK sub-codebooks and dynamic HARQ-ACK codebook); ⁇ 0 bit otherwise.
- - TPC command for scheduled PUSCH - 2 bits -SRS resource indicator (sounding reference signal resource indicator)- or bits ⁇ bits for non-codebook based PUSCH transmission (for non-codebook based PUSCH transmission); ⁇ bits for codebook based PUSCH transmission.
- Precoding information and number of layers - up to 6 bits - Antenna ports - up to 5 bits - SRS request (sounding reference signal request) - 2 bits - CSI request (channel state information request) - 0, 1, 2, 3, 4, 5, or 6 bits - CBG transmission information (code block group transmission information) - 0, 2, 4, 6, or 8 bits - PTRS-DMRS association (phase tracking reference signal - demodulation reference signal relationship) - 2 bits.
- beta_offset indicator (beta-offset indicator) - 2 bits - DMRS sequence initialization - 0 or 1 bit - UL/SUL indicator - 0 or 1 bit
- Countermeasure DCI for scheduling the PDSCH may include, for example, the following information.
- Non-preparation DCI for scheduling PDSCH may include, for example, the following information.
- PRB bundling size indicator (physical resource block bundling size indicator) - 1 bit - Rate matching indicator - 0, 1, 2 bits - ZP CSI-RS trigger (0 power CSI-RS trigger) - X bits
- transport block 1 - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits
- transport block 2 - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits - HARQ process number - 4 bits - Downlink assignment index - 0 or 4 bits - TPC command for scheduled PUCCH - 2 bits - PUCCH resource indicator - PDSCH-to-HARQ_feedback timing indicator - 3 bits - Antenna ports - up to 5 bits - Transmission configuration indication - 3 bits - SRS request - 2 bits - CBG transmission information - 0, 2, 4, 6, or 8 bits - CBG flushing out information (code block group flushing out information)
- the DCI may be transmitted through a PDCCH through channel coding and modulation.
- a CRC bit is added to the DCI message payload, and the CRC is scrambled with an RNTI corresponding to the identity of the UE.
- Different RNTIs are used according to the purpose of the DCI message, for example, UE-specific data transmission, a power control command, or a random access response. That is, the RNTI is not explicitly transmitted, but included in the CRC calculation process and transmitted.
- the UE Upon receiving the DCI message transmitted on the PDCCH, the UE checks the CRC using the assigned RNTI.
- DCI scheduling PDSCH for system information may be scrambled with SI-RNTI.
- DCI scheduling a PDSCH for a random access response (RAR) message may be scrambled with an RA-RNTI.
- DCI scheduling a PDSCH for a paging message may be scrambled with a P-RNTI.
- DCI notifying a slot format indicator (SFI) may be scrambled with an SFI-RNTI.
- DCI notifying transmit power control (TPC) may be scrambled with TPC-RNTI.
- DCI for scheduling UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (cell RNTI).
- 5 is a diagram illustrating an example in which a data channel is transmitted and received.
- a specific terminal receives a data channel, ie, PUSCH or PDSCH, scheduled through the PDCCH, data is transmitted/received along with DMRS in the corresponding scheduled resource region.
- 5 shows a case in which a specific terminal uses 14 OFDM symbols as one slot (or subframe) in downlink, PDCCH is transmitted in the first two OFDM symbols, and DMRS is transmitted in the third symbol.
- the PDSCH is transmitted by being mapped to REs in which DMRS is not transmitted in the third symbol and REs from the fourth to the last symbol thereafter.
- the subcarrier spacing ⁇ f expressed in FIG. 5 is 15 kHz in the case of LTE or LTE-A systems and one of ⁇ 15, 30, 60, 120, 240, 480 ⁇ kHz in the case of 5G systems.
- the SS/PBCH block means a physical layer channel block composed of a primary synchronization signal (primary SS, PSS), a secondary synchronization signal (secondary SS, SSS), and PBCH, which may be transmitted one or more within 5 ms time, Each SS/PBCH block to be transmitted may be distinguished by an index.
- the SS/PBCH block is specifically composed of the following signals and channels.
- - PSS A signal that serves as a reference for downlink time and frequency synchronization, and provides some information on cell ID.
- - SSS A signal that serves as a reference for downlink time and frequency synchronization, and provides remaining cell ID information not provided by PSS. Additionally, it may serve as a reference signal for demodulation of the PBCH.
- a master information block (MIB) transmitted on the PBCH provides essential system information necessary for transmitting and receiving a data channel and a control channel of the UE.
- PBCH may be mixed with a broadcast signal.
- the essential system information includes search space-related control information indicating radio resource mapping information of a control channel, and scheduling control information on a separate data channel for transmitting system information. and the like.
- the information included in the MIB includes the most significant bit (MSB) of the SS/PBCH block index, a half frame timing indicator, system frame number information, and a system information block (SIB).
- control region #0 The control region set by the control region setting information included in the MIB may be referred to as control region #0.
- SIB1 system information block 1
- SIB1 is also referred to as remaining minimum system information, and consists of system information that the terminal needs to know before accessing the network.
- the system information means common (ie, not specific to each terminal) information required for one terminal to properly operate in the network.
- System information is transmitted to the UE in the form of several types of SIBs, and each SIB includes different types of system information.
- SIB1 is periodically broadcast, and in particular, includes information for the terminal to perform initial random access.
- other SIBs include system information that the terminal does not need to know before accessing the network.
- the base station needs to transmit a reference signal.
- the UE can measure the channel state between the base station and the UE using CRS or CSI-RS (channel state information reference signal) transmitted by the base station, and in the case of the NR system, CSI-RS or SSB (synchronization) signal block), the terminal can measure the channel state between the base station and the terminal.
- CRS or CSI-RS channel state information reference signal
- CSI-RS or SSB (synchronization) signal block the terminal can measure the channel state between the base station and the terminal.
- the channel state should be measured in consideration of various factors, which may include an amount of interference in downlink.
- the amount of interference in the downlink includes an interference signal and thermal noise generated by an antenna belonging to an adjacent base station, and the amount of interference in the downlink is important for the UE to determine a downlink channel condition. For example, when a signal is transmitted from a base station having a single transmit antenna to a terminal having a single receive antenna, the terminal receives the energy per symbol that can be received in downlink from the reference signal received from the base station and simultaneously receives the symbol in the section receiving the corresponding symbol. Es/Io (interference amount to energy ratio per symbol) must be determined by judging the amount of interference to be made. The determined Es/Io is converted to a data transmission rate or a value corresponding thereto and transmitted to the base station in the form of a channel quality indicator (CQI), which is used for the base station to determine which data rate to transmit to the terminal.
- CQI channel quality indicator
- the terminal feeds back information on the downlink channel state to the base station so that it can be utilized for downlink scheduling of the base station. That is, the terminal measures the reference signal transmitted by the base station in the downlink, and feeds back information extracted thereto to the base station in the form defined in the standard.
- the information fed back by the UE in may be referred to as channel state information, and the channel state information may include the following three pieces of information.
- RI rank indicator
- PMI Precoding matrix indicator
- CQI channel quality indicator
- CQI may be replaced with a signal to interference plus noise ratio (SINR) that can be utilized similarly to the maximum data rate, the maximum error correction code rate and modulation method, data efficiency per frequency, etc. have.
- SINR signal to interference plus noise ratio
- the RI, PMI, and CQI are related to each other and have meaning.
- a precoding matrix supported by the standard is defined differently for each rank. Therefore, the PMI value X when RI has a value of 1 and the PMI value X when RI has a value of 2 may be interpreted differently.
- the terminal determines the CQI under the assumption that the PMI and X notified to the base station are applied by the base station. That is, the UE reporting RI_X, PMI_Y, and CQI_Z to the base station is equivalent to reporting that the UE can receive the data rate corresponding to CQI_Z when the rank is RI_X and the PMI is PMI_Y. In this way, when the UE calculates the CQI, it is assumed that the base station will perform the transmission method so that optimized performance can be obtained when actual transmission is performed using the transmission method.
- RI, PMI, and CQI which are channel state information fed back by the UE, may be fed back in periodic, aperiodic, or semi-persistent form.
- the base station uses an aperiodic feedback indicator (or channel state information request field, channel state information request information) included in DCI for the terminal to provide aperiodic feedback (or aperiodic channel state information reporting) may be set to be performed.
- feedback information (or channel state information) includes RI, PMI, and CQI, and RI and PMI may not be fed back according to feedback configuration (or channel status report configuration).
- a frame structure for wireless communication including a terahertz (THz) band is proposed.
- the present disclosure proposes a frame structure and an operation of a base station and a terminal when an additional symbol is transmitted every 0.5 ms when extended to support a wider SCS according to the design principle of the frame structure of the existing NR system.
- the present disclosure proposes an operation of a base station and a terminal to transmit and receive system information by transmitting an auxiliary sequence every 0.5 ms.
- a method for designing a frame structure suitable for the terahertz band based on a number of conditions and a specific frame structure are proposed.
- 6A is a diagram showing an example of a frame structure of an NR system.
- SCS 15, 30, 60, 120, and 240 kHz is supported.
- 14 OFDM symbols are included per slot according to each SCS.
- Each OFDM symbol period corresponds to the sum of a cyclic prefix (CP) and an effective symbol length, and the CP means that the last part of the OFDM symbol is copied and inserted into the beginning of the OFDM symbol.
- Inter-subcarrier orthogonality can be protected by reducing signal spread on the time axis and inter-subcarrier interference through CP insertion.
- 6 illustrates a case in which 4096 is assumed as the FFT size (fast Fourier transform size), and the number of CPs means the number of samples (samples, which may be understood as resources of a certain time unit).
- the SCS is 15 kHz (600)
- 7 OFDM symbols are included within 0.5 ms, of which the length of the cyclic prefix (CP) of the first symbol 602 is longer than the length of the CPs of other symbols. Since the number of time units per slot is not divided by the number of symbols, the CP length of the first symbol is increased to fit the slot length of 1 ms.
- the SCS is 30 kHz (610)
- 14 OFDM symbols are included within 0.5 ms, of which the length of the CP of the first symbol 612 is longer than the length of the CPs of other symbols.
- the first OFDM symbol 602 at 0.5 ms of 15 kHz SCS is determined to achieve time synchronization with the first OFDM symbol 612 and second OFDM symbol 614 at 0.5 ms of 30 kHz SCS. That is, the sum of the length of the first symbol 602 at 0.5 ms of 15 kHz SCS and the length of the first symbol 612 and the second symbol 614 at 0.5 ms of 30 kHz SCS is the same.
- the SCS is 60 kHz (620)
- 28 OFDM symbols are included within 0.5 ms, and the length of the CP of the first symbol 622 is longer than the length of the CPs of other symbols.
- the first OFDM symbol 602 at 0.5 ms of 15 kHz SCS is the first OFDM symbol 622, the second OFDM symbol 624, the third OFDM symbol 626 and the fourth OFDM symbol at 0.5 ms of 60 kHz SCS. This is because it has been determined to achieve time synchronization with symbol 628 .
- the SCS is 120 kHz (630)
- 56 OFDM symbols are included in 0.5 ms
- the length of the CP of the first symbol 632 in 0.5 ms is longer than the length of the CPs of other symbols.
- the first OFDM symbol 602 at 0.5 ms of 15 kHz SCS is time-synchronized with the first OFDM symbol 632 and up to the 8th OFDM symbol at 0.5 ms of 120 kHz SCS.
- T1 (650) is the length of the first OFDM symbol among 7 OFDM symbols with a boundary of 0.5 ms when the SCS is 15 kHz
- T (652) is the length of the second and other OFDM symbols when the SCS is 15 kHz.
- the first OFDM symbol 720 of the first slot 710 includes a CP 722 of 539.1 ns and an effective symbol length 724 of 260.4 ns. That is, the length occupied by the CP 722 in the first OFDM symbol 720 is 67.4%.
- the second OFDM symbol 730 includes a CP 732 of 18.3 ns and an effective symbol length 734 of 260.4 ns, and in this case, the CP 732 accounts for 6.57%.
- Table 8 shows the percentage (CP overhead) occupied by the CP in the first symbol of the 0.5 ms time unit according to each SCS.
- the CP occupies a high ratio in the first symbol.
- the present disclosure proposes a method for reducing the excessive CP overhead and usefully using the first symbol.
- n Scaling Subcarrier Spacing (kHz) FFT size (Number of samples for data symbol) Number of samples of normal CP Number of remaining samples CP overhead of other's symbols (%) CP overhead of first symbol (%) 5 32 480 512 36 128 6.569 24.2 6 64 960 512 36 256 6.569 36.3 7 128 1920 512 36 512 6.569 51.6 8 256 3840 512 36 1024 6.569 67.4 9 512 7680 512 36 2048 6.569 80.3 10 1024 15360 512 36 4096 6.569 89.0
- the first method is to additionally allocate X symbols to the residual samples of the first symbol every 0.5 ms.
- 548 minimum samples which is the sum of 36 samples for CP and 512 samples for effective symbol, are required.
- Table 10 below describes the number of symbols that can be additionally allocated according to the SCS.
- Subcarrier Spacing Number of samples allocated to data symbol Number of samples allocated to CP Number of samples remaining before the leading symbol per 0.5 ms Number of additional symbols allocable to slot 0 per 0.5 ms 0 15 512 36 4 0
- Table 10 assumes that the number of samples allocated to the effective symbol part in one symbol is 512, but the number of samples can be simply extended to 1024, 2048, and 4096.
- 2 n ⁇ 1 slots are allocated every 0.5 ms in the same manner as the design principle of the NR system.
- 14 symbols 880 are allocated to the slot k (1 ⁇ k ⁇ 2 n-1 - 1) 860 as in the NR system, whereas, according to the present disclosure, X number of symbols are allocated to the slot 0 850 according to the present disclosure. Additional symbols may be allocated, so that a total of 14+X symbols 870 may be allocated.
- samples remaining after allocation of X additional symbols may be used for CP, for example, the CP of the first symbol may be as long as the number of remaining samples.
- the base station transmits information on the number of additional symbols allocated (eg, X) with RRC signaling (radio resource control signaling or higher layer signaling), MIB (master information block), SIB (system information block, system information) and It can be used interchangeably).
- the additional symbol number information may indicate the value of X directly or indirectly through a flag, a bitmap, or the like, and the value of X according to each SCS may be indicated. (900).
- the value of X is preset according to the value of n or that the value of X is defined in a standard.
- the base station does not signal the value of X, and the terminal may have to blindly detect whether additional symbols are allocated.
- step 900 may be omitted.
- the base station determines the transport block size, (data) scheduling, resource allocation, etc., considering that a total of 14+X symbols including X additional symbols are allocated to the first slot every 0.5 ms. to perform (910).
- the base station may transmit control information including, for example, data allocation information to the terminal, and the data allocation information may indicate a resource including an additionally allocated symbol.
- the base station transmits data to the terminal by mapping the data to the additional symbol ( 920 ). Alternatively, the base station may receive data from the terminal in an additional symbol.
- the terminal may acquire additional symbol number information (eg, X) through signaling of the base station.
- additional symbol number information can be obtained through RRC signaling, MIB, SIB, or the like.
- the additional symbol number information may indicate the value of X directly or indirectly through a flag, a bitmap, or the like, and the value of X according to each SCS may be indicated.
- the additional symbol number X information is preset according to the value of n, or the value of X is defined in the standard.
- the UE may blindly detect whether additional symbols are allocated and obtain the X value.
- the terminal may receive, for example, control information including data allocation information from the base station, and the data allocation information may indicate resources including additional allocated symbols.
- the terminal receives data allocated to 14+X symbols in the first slot, slot 0, every 0.5 ms (1010).
- the terminal may demapping the data symbol from the additionally allocated symbols.
- the terminal transmits data to the base station using 14+X symbols in slot 0.
- the additional symbol located in the first slot every 0.5 ms may be located at the very front of the slot or at a predetermined position among the slots. For example, it is also possible to be located at the rearmost part of the slot or located after the first symbol. Such a location is predetermined, or it is also possible for the terminal to obtain it through RRC signaling, MIB, SIB, etc. transmitted by the base station.
- Table 11 is a table showing the number of samples still remaining to satisfy 0.5 ms alignment after allocation of X additional symbols to the first slot every 0.5 ms.
- n Scaling Subcarrier Spacing FFT size (number of samples for data symbol) number of samples of normal CP number of remaining samples (before) Additional symbol in the first slot in 0.5 ms # of remaining samples (after) 0 One 15 512 36 4 0 4 One 2 30 512 36 8 0 8 2 4 60 512 36 16 0 16 3 8 120 512 36 32 0 32 4 16 240 512 36 64 0 64 5 32 480 512 36 128 0 128 6 64 960 512 36 256 0 256 7 128 1920 512 36 512 0 512 8 256 3840 512 36 1024 One 476 9 512 7680 512 36 2048 3 404 10 1024 15360 512 36 4096 7 206
- FIG. 11 is a diagram illustrating an example of a frame structure using a sample remaining every 0.5 ms as an auxiliary sequence.
- the structure of the slot k (1 ⁇ k ⁇ 2 n-1 - 1) is the same as that of the existing NR system, and 14 symbols are allocated to one slot.
- the number of samples used in the auxiliary sequence does not necessarily use all the residual samples (after additional symbol allocation or when there is no additional symbol allocation) according to the value of the SCS, and may be smaller than the number of residual samples described in Table 11. have.
- the auxiliary sequence may be used for system information transmission or control information transmission of the base station, or may be used for transmission of uplink control information of the terminal.
- the auxiliary sequence may indicate at least one of information included in the MIB or the SIB.
- the auxiliary sequence may include system frame number information, information related to a control channel for receiving SIB1, or a part thereof when transmitted through downlink.
- the auxiliary sequence may include a scheduling request (or information requesting resource allocation of a base station to transmit uplink data) or ACK/NACK information for downlink data.
- the auxiliary sequence may be, for example, a Zadoff-chu sequence or a Hadamard sequence in which each row of a Hadamard matrix constitutes a sequence.
- the information to be indicated by each auxiliary sequence can be indicated by using the values of u and q.
- the auxiliary sequence may be generated by the transmitting end based on a specific number of information, and the receiving end similarly generates a possible sequence based on a specific number of information and receives the sequence transmitted by the transmitting end to correlate ( correlation), it can be determined that the sequence showing the highest correlation is transmitted by the transmitter.
- the auxiliary sequence may be assigned to a sample from the first sample of the first slot to the additional symbol every 0.5 ms boundary or to a predetermined position of the first slot. For example, it is also possible to be allocated in front of a predetermined symbol (eg, the first symbol) or to be located in the rearmost part of the first slot.
- the position of the auxiliary sequence is predetermined, or it is also possible for the terminal to obtain it through RRC signaling, MIB, SIB, etc. transmitted by the base station.
- the base station determines the length of the auxiliary sequence according to the n value of the SCS, and matches each auxiliary sequence with the system information based on the system information to be transmitted.
- the system information may be a part of the MIB or SIB.
- the base station shares the mapping relationship for each auxiliary sequence and the corresponding system information to the terminal through RRC signaling or MIB or SIB, or the mapping relationship may be preset or may be determined in a standard. In this case, separate signaling may not be required ( 1200 ).
- the base station notifies the terminal of information that the auxiliary sequence is transmitted through RRC signaling, MIB, SIB, or the like, or whether the report sequence is transmitted or not may be preset or determined in a standard.
- information indicating whether to transmit the auxiliary sequence may be transmitted through the same signaling as information indicating whether to allocate additional symbols.
- the terminal may blindly detect whether the auxiliary sequence is transmitted. In this case, signaling that the report sequence has been transmitted may be omitted ( 1210 ).
- the base station generates an auxiliary sequence having a length of Y samples remaining every 0.5 ms according to the value of n ( 1220 ).
- the base station transmits an auxiliary sequence in the first sample (or time resource) for every 0.5 ms boundary ( 1230 ).
- the UE may transmit an auxiliary sequence in the sample located first at every boundary of 0.5 ms, and this auxiliary sequence may be generated based on specific information among uplink control information transmitted by the UE to the base station.
- FIG. 13 is a diagram illustrating an example of an operation of a terminal when an auxiliary sequence is transmitted/received every 0.5 ms according to the value of n.
- the terminal checks the value of n through the MIB or based on the transmission band, and obtains mapping relationship information between the length of the corresponding auxiliary sequence and the type of the transmitted auxiliary sequence and the system information corresponding thereto ( 1300 ).
- Such acquisition is possible through RRC signaling, MIB or SIB, or the like.
- the mapping relationship information may be preset or may be determined in a standard.
- the UE may recognize whether the auxiliary sequence is transmitted through separate signaling such as MIB, SIB, or RRC signaling, or through a preset process, or may detect it in a blind manner.
- the information indicating whether to transmit the auxiliary sequence may be received through the same signaling as information indicating whether to allocate additional symbols.
- blind detection corresponds to taking the correlation between the auxiliary sequence already known by the terminal and the received sequence and determining that the auxiliary sequence is transmitted when the correlation is greater than or equal to a specific threshold.
- whether to transmit the auxiliary sequence may be determined in the standard (1310).
- the UE recognizes and receives a predefined number of samples located first at every 0.5 ms boundary as corresponding to the auxiliary sequence ( 1320 ).
- the terminal selects an auxiliary sequence showing the highest correlation by taking a correlation between the received sample and a predefined auxiliary sequence ( 1330 ).
- the terminal acquires system information corresponding to the auxiliary sequence through the mapping relationship between the auxiliary sequence and the system information showing the highest correlation ( 1340 ).
- FIG. 14 is a diagram illustrating an example of allocation of additional symbols and auxiliary symbols according to each SCS.
- the number of residual samples 1402 may be 1024
- 476 samples may be allocated to the auxiliary sequence 1404
- 548 samples may be allocated to the additional symbol 1406 .
- the number of residual samples 1412 is 2048
- 404 samples may be allocated to the auxiliary sequence 1413
- 548 samples may be allocated to each additional symbol 1414 , 1415 , and 1416 .
- 684, 682, and 682 samples may be allocated to the additional symbols 1417, 1418, and 1419, respectively.
- the length of the CP in each additional symbol may be increased.
- the number of residual samples 1422 may be 4096
- 206 samples may be allocated to the auxiliary sequence 1424
- 548 samples may be allocated to each of the 7 additional symbols 1426 .
- 586, 585, 585, 585, 585, 585, 585, and 585 samples may be allocated to the seven additional symbols 1428, respectively.
- the number of samples of the auxiliary sequence and the additional symbol shown in FIG. 14 is only an example, and the present invention is not limited to the specific number of samples.
- a new frame structure other than the frame structure used in LTE or NR systems is proposed.
- the present disclosure suggests the following conditions for designing a new frame structure, and proposes a frame structure that satisfies all or part of each condition.
- condition A is SCS , an integer with l ⁇ 0, or , l, m, and n are limited to integers greater than or equal to 0. This is in consideration of phase locked loop (PLL) clock multiplication, but the present invention is not limited thereto.
- PLL phase locked loop
- an SCS within 2.8 to 3.4 MHz was selected in consideration of phase noise.
- Condition B is a slot alignment condition, consisting of a slot consisting of a symbol having a normal CP (Normal CP) and a symbol having an extended CP (extended CP, which may be in consideration of a communication environment in which a delay may be longer). It is a condition that the length between slots must be the same.
- Condition C is a condition that the CPs of all symbols are the same.
- Condition D is a condition in which a plurality of slots are accurately packed in 1 ms. That is, it means that the sum of the lengths of the plurality of slots becomes 1 ms.
- 16 shows SCS under condition A. , an integer with l ⁇ 0, It is a diagram showing an example of a frame structure that satisfies the conditions B and C. 16 is a frame in which SCS is selected in condition A in the range of 2.7 MHz to 3.4 MHz, and conditions B and C are satisfied, the length of the normal CP is 20 to 24 ns, and the length of the extended CP is selected from the range of 40 to 50 ns This is an example of a structure. According to FIG.
- symbol length, effective symbol length, normal CP and extended CP length, general CP overhead in case of SCS satisfying the above conditions A, B and C and normal CP and extended CP in this case , the overhead of the extended CP, the number of symbols per slot when the normal CP and the extended CP are used, and the length of the slot are shown.
- the number of samples described in FIG. 16 assumes that the FFT size is 512, that is, the number of samples of an effective symbol is 512, but the invention of the present disclosure is not limited to this example.
- the length of the symbol including the normal CP may be 3.69*10 -7 s
- the length of the symbol including the extended CP may be 3.91*10 -7 s
- one symbol The length of my valid symbol can be 3.47*10 -7 s.
- the length of the normal CP may be 2.17*10 -8 s
- the length of the extended CP may be 4.34*10 -8 s.
- 18 symbols with a normal CP may be included in one slot
- 17 symbols with an extended CP may be included
- the length of the slot may be 6.64*10 -6 s.
- the base station and the terminal can transmit and receive signals based on this frame structure.
- 17 is condition A. , an integer with l ⁇ 0, It is a diagram showing an example of a frame structure that satisfies condition B, condition C, and condition D. 17 shows that in condition A, the SCS is selected from 2.6 MHz to 3.0 MHz, and conditions B, C, and D are satisfied, and the length of the normal CP is 20 to 24 ns, and the length of the extended CP is in the range of 40 to 50 ns This is an example of the frame structure selected from According to FIG.
- the number of symbols per slot in the case of the SCS satisfying the conditions A, B, C and D and the normal CP and the extended CP in this case the number of slots within 1 ms, the length of the slot, the normal CP value extension
- the symbol length, the effective symbol length, the number of samples of the normal CP and the extended CP, the overhead of the normal CP, and the overhead of the extended CP are shown.
- the number of samples described in FIG. 17 assumes that the FFT size is 512, that is, the number of samples of an effective symbol is 512, but the invention of the present disclosure is not limited to this example.
- the base station and the terminal can transmit and receive signals based on this frame structure.
- 18 shows SCS under condition A.
- l, m, and n are integers equal to or greater than 0, and it is a diagram showing an example of a frame structure that satisfies the conditions C and D.
- 18 is a frame in which the SCS is selected in the range of 2.4 MHz to 4.1 MHz in condition A, the length of the general CP is selected in the range of 15 to 70 ns while satisfying the conditions C and D, and the number of symbols per slot satisfies 9 This is an example of a structure. According to FIG.
- the SCS satisfying the conditions A, C and D, the number of slots packed in 1 ms according to each SCS, the number of samples of the CP, the length of the symbol including the CP, the length of the effective symbol, the length of the CP are shown respectively.
- the number of samples described in FIG. 18 assumes that the FFT size is 512, that is, the number of samples of an effective symbol is 512, but the invention of the present disclosure is not limited to this example.
- FIG. 19 shows SCS under condition A.
- l, m, and n are integers equal to or greater than 0, and it is a diagram showing an example of a frame structure that satisfies the conditions C and D.
- 19 is a frame in which the SCS is selected in the range of 2.4 MHz to 4.1 MHz in condition A, the length of the general CP is selected in the range of 15 to 70 ns while satisfying the conditions C and D, and the number of symbols per slot satisfies 10 This is an example of a structure.
- FIG. 19 shows SCS under condition A.
- l, m, and n are integers equal to or greater than 0
- n are integers equal to or greater than 0
- 19 is a frame in which the SCS is selected in the range of 2.4 MHz to 4.1 MHz in condition A, the length of the general CP is selected in the range of 15 to 70 ns while satisfying the conditions C and D, and the number of symbols per slot satisfies 10
- the SCS satisfying the conditions A, C and D, the number of slots packed in 1 ms according to each SCS, the number of samples of the CP, the length of the symbol including the CP, the length of the effective symbol, the length of the CP are shown respectively.
- the number of samples described in FIG. 19 assumes that the FFT size is 512, that is, the number of samples of an effective symbol is 512, but the invention of the present disclosure is not limited to this example.
- the base station and the terminal can transmit and receive signals based on this frame structure.
- 20 shows SCS under condition A.
- l, m, and n are integers greater than or equal to 0, and is a diagram showing another example of a frame structure that satisfies the conditions C and D.
- 20 is a frame in which SCS is selected in the range of 2.4 MHz to 4.1 MHz in condition A, conditions C and D are satisfied, the length of the general CP is selected in the range of 15 to 70 ns, and the number of symbols per slot satisfies 12 This is an example of a structure. According to FIG.
- the SCS satisfying the conditions A, C and D, the number of slots packed in 1ms according to each SCS, the number of samples of the CP, the length of the symbol including the CP, the length of the effective symbol, the length of the CP are shown respectively.
- the number of samples described in FIG. 20 assumes that the FFT size is 512, that is, the number of samples of an effective symbol is 512, but the invention of the present disclosure is not limited to this example.
- the base station and the terminal can transmit and receive signals based on this frame structure.
- 21 shows SCS under condition A.
- l, m, and n are integers greater than or equal to 0, and is a diagram showing another example of a frame structure that satisfies the conditions C and D.
- 21 is a frame in which SCS is selected in the range of 2.4 MHz to 4.5 MHz in condition A, conditions C and D are satisfied, the length of the general CP is selected in the range of 15 to 70 ns, and the number of symbols per slot satisfies 15 This is an example of a structure. According to FIG.
- the SCS satisfying the conditions A, C and D, the number of slots packed in 1 ms according to each SCS, the number of samples of the CP, the length of the symbol including the CP, the length of the effective symbol, the length of the CP are shown respectively.
- the number of samples described in FIG. 21 assumes that the FFT size is 512, that is, the number of samples of an effective symbol is 512, but the invention of the present disclosure is not limited to this example.
- the base station and the terminal can transmit and receive signals based on this frame structure.
- 22 shows SCS under condition A.
- l, m, and n are integers greater than or equal to 0, and is a diagram showing another example of a frame structure that satisfies the conditions C and D.
- 22 is a frame in which SCS is selected in the range of 2.4 MHz to 4.5 MHz in condition A, conditions C and D are satisfied, the length of the general CP is selected in the range of 15 to 70 ns, and the number of symbols per slot satisfies 16 This is an example of a structure. According to FIG.
- the SCS satisfying the conditions A, C and D, the number of slots packed in 1ms according to each SCS, the number of samples of the CP, the length of the symbol including the CP, the length of the effective symbol, the length of the CP are shown respectively.
- the number of samples described in FIG. 22 assumes that the FFT size is 512, that is, the number of samples of an effective symbol is 512, but the invention of the present disclosure is not limited to this example.
- the base station and the terminal can transmit and receive signals based on this frame structure.
- 23 shows SCS under condition A.
- l, m, and n are integers greater than or equal to 0, and is a diagram showing another example of a frame structure that satisfies the conditions C and D.
- 23 is a frame in which SCS is selected in the range of 2.4 MHz to 4.5 MHz in condition A, conditions C and D are satisfied, the length of the general CP is selected in the range of 15 to 70 ns, and the number of symbols per slot satisfies 18 This is an example of a structure. According to FIG.
- the SCS satisfying the conditions A, C and D, the number of slots packed in 1 ms according to each SCS, the number of samples of the CP, the length of the symbol including the CP, the length of the effective symbol, the length of the CP are shown respectively.
- the number of samples described in FIG. 23 assumes that the FFT size is 512, that is, the number of samples of an effective symbol is 512, but the invention of the present disclosure is not limited to this example.
- the base station and the terminal can transmit and receive signals based on this frame structure.
- 24 shows SCS under condition A.
- l, m, and n are integers greater than or equal to 0, and it is a diagram showing still another example of a frame structure that satisfies the conditions C and D.
- 24 is a frame in which SCS is selected in the range of 2.4 MHz to 4.5 MHz in condition A, conditions C and D are satisfied, the length of the general CP is selected in the range of 15 to 70 ns, and the number of symbols per slot satisfies 20 This is an example of a structure. According to FIG.
- the SCS satisfying the conditions A, C and D, the number of slots packed in 1ms according to each SCS, the number of samples of the CP, the length of the symbol including the CP, the length of the effective symbol, the length of the CP are shown respectively.
- the number of samples described in FIG. 24 assumes a case where the FFT size is 512, that is, a case where the number of samples of an effective symbol is 512, but the invention of the present disclosure is not limited to this example.
- the base station and the terminal can transmit and receive signals based on this frame structure.
- a transmitter, a receiver, and a controller of the terminal and the base station are shown in FIGS. 25 and 26, respectively.
- a method for transmitting and receiving a base station and a terminal for applying a method for transmitting and receiving a downlink control channel and a data channel in the communication system corresponding to the above embodiment is shown, and a transmitter, a receiver, and a processing unit of the base station and the terminal are respectively implemented to perform this It should work according to the example.
- FIG. 25 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present invention.
- the terminal of the present invention may include a terminal processing unit 2501 , a receiving unit 2502 , and a transmitting unit 2503 .
- the terminal processing unit 2501 may control a series of processes in which the terminal may operate according to the above-described embodiment of the present invention.
- the processing unit 2501 of the terminal may be controlled to receive and decode symbols additionally allocated and transmitted by the base station according to an embodiment of the present invention, and to perform a process of checking system information by receiving and confirming an auxiliary sequence.
- the terminal receiving unit 2502 and the terminal transmitting unit 2503 may be collectively referred to as a transceiver in the embodiment of the present invention.
- the transceiver may transmit/receive a signal to/from the base station.
- the signal may include control information and data.
- the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal.
- the transceiver may receive a signal through the wireless channel and output it to the terminal processing unit 2501 , and transmit the signal output from the terminal processing unit 2501 through the wireless channel.
- the base station of the present invention may include a base station processing unit 2601 , a receiving unit 2602 , and a transmitting unit 2603 .
- the base station processing unit 2601 may control a series of processes so that the base station can operate according to the above-described embodiment of the present invention.
- the processing unit 2601 of the base station transmits a signal using X additional symbols additionally allocated to the first slot every 0.5 ms according to the value of n according to the embodiment of the present invention and/or corresponds to the auxiliary sequence.
- a transceiver in the embodiment of the present invention.
- the transceiver may transmit/receive a signal to/from the terminal.
- the signal may include control information and data.
- the transceiver may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low-noise amplifying and down-converting a received signal.
- the transceiver may receive a signal through a wireless channel and output it to the base station processing unit 2601 , and transmit the signal output from the base station processing unit 2601 through the wireless channel.
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Abstract
Description
SCS (kHz) | 채널 대역폭 (Channel bandwidth) BWChannel (MHz) | ||||||||||
5 | 10 | 15 | 20 | 25 | 40 | 50 | 60 | 80 | 100 | ||
최대 전송 대역폭 Maximum Transmission bandwidth NRB |
15 | 25 | 52 | 79 | 106 | 133 | 216 | 270 | N.A. | N.A. | N.A. |
30 | 11 | 24 | 38 | 51 | 65 | 106 | 133 | 162 | 217 | 273 | |
60 | N.A. | 11 | 18 | 24 | 31 | 51 | 65 | 79 | 107 | 135 |
Search space Sk (L) | Number of PDCCH candidates M(L) | ||
Type | Aggregation level L | Size (in CCEs) | |
UE-specific | 1 | 6 | 6 |
2 | 12 | 6 | |
4 | 8 | 2 | |
8 | 16 | 2 | |
Common | 4 | 16 | 4 |
8 | 16 | 2 |
- 설정정보 1. 주파수 축 RB 할당 정보 - 설정정보 2. 제어영역 시작 심볼 - 설정정보 3. 제어영역 심볼 길이 - 설정정보 4. REG 번들링 크기 (2 또는 3 또는 6) - 설정정보 5. 전송 모드 (Interleaved 전송 방식 또는 Non-interleaved 전송 방식) - 설정정보 6. DMRS 설정 정보 (Precoder granularity) - 설정정보 7. 탐색공간 타입 (공통 탐색공간, 그룹-공통 탐색공간, 단말-특정 탐색공간) - 설정정보 8. 해당 제어영역에서 모니터링 할 DCI 포맷 - 그 외 |
- Identifier for DCI formats (DCI 포맷 식별자) - [1] bit - Frequency domain resource assignment (주파수 도메인 자원 할당) - [] bits - Time domain resource assignment (시간 도메인 자원 할당) - X bits - Frequency hopping flag (주파수 호핑 플래그) - 1 bit. - Modulation and coding scheme - [5] bits - New data indicator - 1 bit - Redundancy version - [2] bits - HARQ process number - [4] bits - TPC command for scheduled PUSCH - [2] bits - UL/SUL indicator (상향링크/추가 상향링크 지시자) - 0 or 1 bit |
- Carrier indicator (캐리어 식별자) - 0 or 3 bits - Identifier for DCI formats - [1] bits - Bandwidth part indicator (대역폭 파트 지시자) 0 0, 1 or 2 bits - Frequency domain resource assignment ○ For resource allocation type 0, bits ○ For resource allocation type 1, bits - Time domain resource assignment - 1, 2, 3, or 4 bits - VRB-to-PRB mapping (가상 자원 블록(virtual resource block)-to-물리 자원 블록(physical resource block) 매핑)- 0 or 1 bit, only for resource allocation type 1(자원 할당 타입 1의 경우 1 비트 또는 다른 경우 0 비트). ○ 0 bit if only resource allocation type 0 is configured(자원 할당 타입 0 설정시 0비트); ○ 1 bit otherwise(다른 경우 1 비트). - Frequency hopping flag - 0 or 1 bit, only for resource allocation type 1. ○ 0 bit if only resource allocation type 0 is configured; ○ 1 bit otherwise. - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits as defined in section x.x of [6, TS38.214] - HARQ process number - 4 bits - 1st downlink assignment index (제1 하향링크 할당 인덱스) - 1 or 2 bits ○ 1 bit for semi-static HARQ-ACK codebook(준정적 HARQ-ACK 코드북의 경우 1 비트); ○ 2 bits for dynamic HARQ-ACK codebook with single HARQ-ACK codebook(단일 HARQ-ACK 코드북과 동적 HARQ-ACK 코드북의 경우 2 비트). - 2nd downlink assignment index(제2 하향링크 할당 인덱스) - 0 or 2 bits ○ 2 bits for dynamic HARQ-ACK codebook with two HARQ-ACK sub-codebooks(2개의 HARQ-ACK 서브 코드북과 동적 HARQ-ACK 코드북의 경우 2 비트); ○ 0 bit otherwise(다른 경우 0 비트). - TPC command for scheduled PUSCH - 2 bits - SRS resource indicator (사운딩 기준 신호 자원 지시자)- or bits ○ bits for non-codebook based PUSCH transmission(코드북 기반이 아닌 PUSCH 전송의 경우); ○ bits for codebook based PUSCH transmission(코드북 기반 PUSCH 전송의 경우). - Precoding information and number of layers(프리코딩 정보와 레이어의 수) - up to 6 bits - Antenna ports(안테나 포트) - up to 5 bits - SRS request(사운딩 기준 신호 요청) - 2 bits - CSI request(채널 상태 정보 요청) - 0, 1, 2, 3, 4, 5, or 6 bits - CBG transmission information(코드 블록 그룹(code block group) 전송 정보) - 0, 2, 4, 6, or 8 bits - PTRS-DMRS association(위상 트래킹 기준 신호-복조 기준 신호 관계) - 2 bits. - beta_offset indicator(베타-오프셋 지시자) - 2 bits - DMRS sequence initialization(DMRS 시퀀스 초기화) - 0 or 1 bit - UL/SUL indicator - 0 or 1 bit |
- Identifier for DCI formats - [1] bit - Frequency domain resource assignment - [] bits - Time domain resource assignment - X bits - VRB-to-PRB mapping - 1 bit. - Modulation and coding scheme - [5] bits - New data indicator - 1 bit - Redundancy version - [2] bits - HARQ process number - [4] bits - Downlink assignment index - 2 bits - TPC command for scheduled PUCCH - [2] bits - PUCCH resource indicator(물리 상향링크 제어 채널(physical uplink control channel, PUCCH) 자원 지시자) - [2] bits - PDSCH-to-HARQ feedback timing indicator (PDSCH-to-HARQ 피드백 타이밍 지시자) - [3] bits |
- Carrier indicator - 0 or 3 bits - Identifier for DCI formats - [1] bits - Bandwidth part indicator - 0, 1 or 2 bits - Frequency domain resource assignment ○ For resource allocation type 0, bits ○ For resource allocation type 1, bits - Time domain resource assignment - 1, 2, 3, or 4 bits - VRB-to-PRB mapping - 0 or 1 bit, only for resource allocation type 1. ○ 0 bit if only resource allocation type 0 is configured; ○ 1 bit otherwise. - PRB bundling size indicator(물리 자원 블록 번들링 크기 지시자) - 1 bit - Rate matching indicator(레이트 매칭 지시자) - 0, 1, 2 bits - ZP CSI-RS trigger(0전력 CSI-RS 트리거) - X bits For transport block 1: - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits For transport block 2: - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits - HARQ process number - 4 bits - Downlink assignment index - 0 or 4 bits - TPC command for scheduled PUCCH - 2 bits - PUCCH resource indicator - PDSCH-to-HARQ_feedback timing indicator - 3 bits - Antenna ports - up to 5 bits - Transmission configuration indication(전송 설정 지시) - 3 bits - SRS request - 2 bits - CBG transmission information - 0, 2, 4, 6, or 8 bits - CBG flushing out information(코드 블록 그룹 플러싱 아웃 정보) - 0 or 1 bit - DMRS sequence initialization - 0 or 1 bit |
n | SCS (Hz) | CP overhead of the first symbol (%) |
0 | 15000 | 7.2 |
1 | 30000 | 7.9 |
2 | 60000 | 9.2 |
3 | 120000 | 11.7 |
4 | 240000 | 16.3 |
5 | 480000 | 24.2 |
6 | 960000 | 36.3 |
7 | 1920000 | 51.6 |
8 | 3840000 | 67.4 |
n | Scaling | Subcarrier Spacing (kHz) |
FFT size (Number of samples for data symbol) |
Number of samples of normal CP |
Number of remaining samples |
CP overhead of other's symbols (%) | CP overhead of first symbol (%) |
5 | 32 | 480 | 512 | 36 | 128 | 6.569 | 24.2 |
6 | 64 | 960 | 512 | 36 | 256 | 6.569 | 36.3 |
7 | 128 | 1920 | 512 | 36 | 512 | 6.569 | 51.6 |
8 | 256 | 3840 | 512 | 36 | 1024 | 6.569 | 67.4 |
9 | 512 | 7680 | 512 | 36 | 2048 | 6.569 | 80.3 |
10 | 1024 | 15360 | 512 | 36 | 4096 | 6.569 | 89.0 |
n | Subcarrier Spacing (kHz) |
데이터 심볼에 할당되는 샘플의 수 | CP에 할당되는 샘플의 수 | 0.5 ms 당 가장 앞 심볼 앞에 남아 있는 샘플의 수 | 0.5 ms 당 slot 0에 할당 가능한 추가 심볼 수 |
0 | 15 | 512 | 36 | 4 | 0 |
1 | 30 | 512 | 36 | 8 | 0 |
2 | 60 | 512 | 36 | 16 | 0 |
3 | 120 | 512 | 36 | 32 | 0 |
4 | 240 | 512 | 36 | 64 | 0 |
5 | 480 | 512 | 36 | 128 | 0 |
6 | 960 | 512 | 36 | 256 | 0 |
7 | 1920 | 512 | 36 | 512 | 0 |
8 | 3840 | 512 | 36 | 1024 | 1 |
9 | 7680 | 512 | 36 | 2048 | 3 |
10 | 15360 | 512 | 36 | 4096 | 7 |
n | Scaling | Subcarrier Spacing (kHz) |
FFT size (number of samples for data symbol) |
number of samples of normal CP |
number of remaining samples (before) |
Additional symbol in the first slot in 0.5 ms |
# of remaining samples (after) |
0 | 1 | 15 | 512 | 36 | 4 | 0 | 4 |
1 | 2 | 30 | 512 | 36 | 8 | 0 | 8 |
2 | 4 | 60 | 512 | 36 | 16 | 0 | 16 |
3 | 8 | 120 | 512 | 36 | 32 | 0 | 32 |
4 | 16 | 240 | 512 | 36 | 64 | 0 | 64 |
5 | 32 | 480 | 512 | 36 | 128 | 0 | 128 |
6 | 64 | 960 | 512 | 36 | 256 | 0 | 256 |
7 | 128 | 1920 | 512 | 36 | 512 | 0 | 512 |
8 | 256 | 3840 | 512 | 36 | 1024 | 1 | 476 |
9 | 512 | 7680 | 512 | 36 | 2048 | 3 | 404 |
10 | 1024 | 15360 | 512 | 36 | 4096 | 7 | 206 |
Claims (15)
- 통신 시스템의 기지국이 수행하는 방법에 있어서,단말과 신호를 송수신할 서브캐리어 스페이싱(subcarrier spacing)을 확인하는 단계;상기 단말로 추가 심볼의 할당 여부 또는 추가 심볼의 개수 중 적어도 하나를 지시하는 정보를 포함하는 신호를 전송하는 단계;상기 추가 심볼의 할당을 기반으로, 데이터를 위한 데이터 할당 정보를 생성하는 단계;상기 단말로 상기 데이터 할당 정보 및 상기 데이터를 전송하는 단계를 포함하며,상기 추가 심볼은 0.5ms 경계마다의 첫 슬롯의 미리 정해진 부분에 할당되는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 추가 심볼의 개수는 상기 서브캐리어 스페이싱에 기반하며,상기 서브캐리어 스페이싱이 15Х2n kHz이고 n이 8인 경우 상기 추가 심볼의 개수는 최대 1개이며,상기 서브캐리어 스페이싱이 15Υ2n kHz이고 n이 9인 경우 상기 추가 심볼의 개수는 최대 3개이며,상기 서브캐리어 스페이싱이 15Υ2n kHz이고 n이 10인 경우 상기 추가 심볼의 개수는 최대 7개인 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 단말로 보조 수열 전송 여부 또는 보조 수열과 상기 보조 수열가 포함하는 정보의 매핑 관계 중 적어도 하나를 지시하는 정보를 포함하는 신호를 전송하는 단계를 더 포함하며,상기 보조 수열은 상기 0.5ms 경계마다의 첫 슬롯의 가장 첫 샘플부터 상기 추가 심볼 전까지의 샘플 또는 상기 0.5ms 경계를 기반으로 미리 결정된 위치에 위치하는 것을 특징으로 하는 방법.
- 제3항에 있어서,상기 단말로 전송하고자 하는 제어 정보를 확인하는 단계;상기 제어 정보에 상응하는 상기 보조 수열을 생성하는 단계; 및상기 보조 수열을 전송하는 단계를 더 포함하는 것을 특징으로 하는 방법.
- 통신 시스템의 단말이 수행하는 방법에 있어서,기지국과 신호를 송수신할 서브캐리어 스페이싱(subcarrier spacing)을 확인하는 단계;상기 기지국으로부터 추가 심볼의 할당 여부 또는 추가 심볼의 개수 중 적어도 하나를 지시하는 정보를 포함하는 신호를 수신하는 단계;상기 기지국으로부터 데이터를 위한 데이터 할당 정보를 수신하는 단계;상기 기지국으로부터 상기 데이터 할당 정보을 기반으로 상기 추가 심볼 상에서 상기 데이터를 수신하는 단계를 포함하며,상기 추가 심볼은 0.5ms 경계마다의 첫 슬롯의 미리 정해진 부분에 할당되는 것을 특징으로 하는 방법.
- 제5항에 있어서,상기 추가 심볼의 개수는 상기 서브캐리어 스페이싱에 기반하며,상기 서브캐리어 스페이싱이 15Υ2n kHz이고 n이 8인 경우 상기 추가 심볼의 개수는 최대 1개이며,상기 서브캐리어 스페이싱이 15Υ2n kHz이고 n이 9인 경우 상기 추가 심볼의 개수는 최대 3개이며,상기 서브캐리어 스페이싱이 15Υ2n kHz이고 n이 10인 경우 상기 추가 심볼의 개수는 최대 7개인 것을 특징으로 하는 방법.
- 제5항에 있어서,상기 기지국으로부터 보조 수열 전송 여부 또는 보조 수열과 상기 보조 수열가 포함하는 정보의 매핑 관계 중 적어도 하나를 지시하는 정보를 포함하는 신호를 수신하는 단계를 더 포함하며,상기 보조 수열은 상기 0.5ms 경계마다의 첫 슬롯의 가장 첫 샘플부터 상기 추가 심볼 전까지의 샘플 또는 상기 0.5ms 경계를 기반으로 미리 결정된 위치에 위치하는 것을 특징으로 하는 방법.
- 제7항에 있어서,상기 보조 수열을 수신하는 단계;복수의 수열과 상기 보조 수열의 상관도를 확인하는 단계; 및상기 확인된 상관도 중 가장 높은 상관도에 해당하는 수열에 대응되는 제어 정보를 확인하는 단계를 더 포함하는 것을 특징으로 하는 방법.
- 통신 시스템의 기지국에 있어서,송수신부; 및단말과 신호를 송수신할 서브캐리어 스페이싱(subcarrier spacing)을 확인하고, 상기 단말로 추가 심볼의 할당 여부 또는 추가 심볼의 개수 중 적어도 하나를 지시하는 정보를 포함하는 신호를 전송하고, 상기 추가 심볼의 할당을 기반으로, 데이터를 위한 데이터 할당 정보를 생성하고, 상기 단말로 상기 데이터 할당 정보 및 상기 데이터를 전송하도록 제어하는 제어부를 포함하고,상기 추가 심볼은 0.5ms 경계마다의 첫 슬롯의 미리 정해진 부분에 할당되는 것을 특징으로 하는 기지국.
- 제9항에 있어서,상기 추가 심볼의 개수는 상기 서브캐리어 스페이싱에 기반하며,상기 서브캐리어 스페이싱이 15Υ2n kHz이고 n이 8인 경우 상기 추가 심볼의 개수는 최대 1개이며,상기 서브캐리어 스페이싱이 15Υ2n kHz이고 n이 9인 경우 상기 추가 심볼의 개수는 최대 3개이며,상기 서브캐리어 스페이싱이 15Υ2n kHz이고 n이 10인 경우 상기 추가 심볼의 개수는 최대 7개인 것을 특징으로 하는 기지국.
- 제9항에 있어서,상기 제어부는 상기 단말로 보조 수열 전송 여부 또는 보조 수열과 상기 보조 수열가 포함하는 정보의 매핑 관계 중 적어도 하나를 지시하는 정보를 포함하는 신호를 전송하도록 더 제어하고,상기 보조 수열은 상기 0.5ms 경계마다의 첫 슬롯의 가장 첫 샘플부터 상기 추가 심볼 전까지의 샘플 또는 상기 0.5ms 경계를 기반으로 미리 결정된 위치에 위치하는 것을 특징으로 하는 기지국.
- 제11항에 있어서,상기 제어부는 상기 단말로 전송하고자 하는 제어 정보를 확인하고, 상기 제어 정보에 상응하는 상기 보조 수열을 생성하고, 상기 보조 수열을 전송하도록 더 제어하는 것을 특징으로 하는 기지국.
- 통신 시스템의 단말에 있어서,송수신부; 및기지국과 신호를 송수신할 서브캐리어 스페이싱(subcarrier spacing)을 확인하고, 상기 기지국으로부터 추가 심볼의 할당 여부 또는 추가 심볼의 개수 중 적어도 하나를 지시하는 정보를 포함하는 신호를 수신하고, 상기 기지국으로부터 데이터를 위한 데이터 할당 정보를 수신하고, 상기 기지국으로부터 상기 데이터 할당 정보을 기반으로 상기 추가 심볼 상에서 상기 데이터를 수신하도록 제어하는 제어부를 포함하고,상기 추가 심볼은 0.5ms 경계마다의 첫 슬롯의 미리 정해진 부분에 할당되는 것을 특징으로 하는 단말.
- 제13항에 있어서,상기 추가 심볼의 개수는 상기 서브캐리어 스페이싱에 기반하며,상기 서브캐리어 스페이싱이 15Υ2n kHz이고 n이 8인 경우 상기 추가 심볼의 개수는 최대 1개이며,상기 서브캐리어 스페이싱이 15Υ2n kHz이고 n이 9인 경우 상기 추가 심볼의 개수는 최대 3개이며,상기 서브캐리어 스페이싱이 15Υ2n kHz이고 n이 10인 경우 상기 추가 심볼의 개수는 최대 7개인 것을 특징으로 하는 단말.
- 제13항에 있어서,상기 제어부는 상기 기지국으로부터 보조 수열 전송 여부 또는 보조 수열과 상기 보조 수열가 포함하는 정보의 매핑 관계 중 적어도 하나를 지시하는 정보를 포함하는 신호를 수신하고, 상기 보조 수열은 상기 0.5ms 경계마다의 첫 슬롯의 가장 첫 샘플부터 상기 추가 심볼 전까지의 샘플 또는 상기 0.5ms 경계를 기반으로 미리 결정된 위치에 위치하고,상기 보조 수열을 수신하고, 복수의 수열과 상기 보조 수열의 상관도를 확인하고, 상기 확인된 상관도 중 가장 높은 상관도에 해당하는 수열에 대응되는 제어 정보를 확인하도록 더 제어하는 것을 특징으로 하는 단말.
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