Method and apparatus for transmitting and receiving physical uplink control channel

Abstract

The present invention relates to a method for transmitting and receiving a physical uplink control channel and an apparatus thereof. The present invention relates to a method for transmitting a physical uplink control channel, the method comprising: determining a sequence hopping pattern based on a frequency hopping index determined based on whether frequency hopping is configured in a time slot; and transmitting a first PUCCH including a demodulation reference signal to which the determined sequence hopping pattern is applied, or a second PUCCH to which the determined sequence hopping pattern is applied.

Description

[0001] This application is a divisional application of the patent application with application number 201880016794.7 (PCT / KR2018 / 006852) filed with the China Patent Office on September 9, 2019, with an international application date of June 18, 2018, and the invention name is “Method and device for sending and receiving physical uplink control channels”. Technical Field

[0002] The present disclosure relates to a wireless communication system, and more particularly, to a method for transmitting and receiving a physical uplink control channel between a terminal and a base station in the wireless communication system and an apparatus for supporting the method. Background Art

[0003] Wireless access systems have been widely deployed to provide various types of communication services, such as voice and data. Typically, wireless access systems are multiple-access systems that support communication among multiple users by sharing available system resources (bandwidth, transmission power, etc.). For example, multiple-access systems include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single-carrier frequency division multiple access (SC-FDMA).

[0004] As many communication devices have demanded higher communication capacity, the need for significantly improved mobile broadband communications compared to existing radio access technologies (RATs) has increased. Furthermore, large-scale machine-type communications (MTC), which connect multiple devices or objects to each other and can provide various services at any time and any place, have been considered in next-generation communication systems. Furthermore, communication system designs capable of supporting services and UEs that are sensitive to reliability and latency have been discussed.

[0005] As described above, introduction of the next generation RAT considering enhanced mobile broadband communication, massive MTC, ultra-reliable and low-latency communication (URLLC), and the like has been discussed. Summary of the Invention

[0006] Technical issues

[0007] An object of the present disclosure is to provide a method for transmitting and receiving a physical uplink control channel between a terminal and a base station in a wireless communication system and an apparatus for supporting the method.

[0008] It will be apparent to those skilled in the art that the objectives that can be achieved by the present disclosure are not limited to what has been described in detail above, and the above and other objectives that can be achieved by the present disclosure will be more clearly understood from the following detailed description.

[0009] Technical Solution

[0010] The present disclosure provides a method for transmitting and receiving a physical uplink control channel between a terminal and a base station in a wireless communication system and an apparatus for supporting the method.

[0011] In one aspect of the present disclosure, a method for transmitting a physical uplink control channel (PUCCH) by a user equipment (UE) to a base station in a wireless communication system is provided. The method may include: determining a sequence hopping pattern based on a frequency hopping index determined according to whether frequency hopping is configured in a time slot; and transmitting a first PUCCH including a demodulation reference signal (DM-RS) to which the determined sequence hopping pattern is applied, or a second PUCCH to which the determined sequence hopping pattern is applied.

[0012] For example, when frequency hopping is configured in a time slot, the frequency hopping indexes may be sequentially numbered from 0 to N (where N is a natural number) for hopping in the time slot.

[0013] As another example, when frequency hopping is not configured in the time slot, the frequency hopping index may correspond to 0.

[0014] The sequence hopping pattern may be determined based on a combination of a sequence group hopping pattern for selecting one sequence group from a plurality of sequence groups and a base sequence hopping pattern for selecting one base sequence from a plurality of base sequences in a specific sequence group.

[0015] In addition, in addition to the frequency hopping index, the sequence hopping pattern can also be determined based on the time slot index.

[0016] In another aspect of the present disclosure, a method for receiving a physical uplink control channel (PUCCH) by a base station from a UE in a wireless communication system is provided. The method may include receiving, from the UE, a first PUCCH including a demodulation reference signal (DM-RS) to which a specific sequence hopping pattern is applied, or a second PUCCH to which a specific sequence hopping pattern is applied. The specific sequence hopping pattern may be determined based on a frequency hopping index determined according to whether frequency hopping is configured in a time slot.

[0017] For example, when frequency hopping is configured in a time slot, the frequency hopping indexes may be sequentially numbered from 0 to N (where N is a natural number) for hopping in the time slot.

[0018] As another example, when frequency hopping is not configured in the time slot, the frequency hopping index may correspond to 0.

[0019] The sequence hopping pattern may be determined based on a combination of a sequence group hopping pattern for selecting one sequence group from a plurality of sequence groups and a base sequence hopping pattern for selecting one base sequence from a plurality of base sequences in a specific sequence group.

[0020] In addition, in addition to the frequency hopping index, the sequence hopping pattern can also be determined based on the time slot index.

[0021] In this case, the base station may transmit configuration information indicating whether frequency hopping is configured in the time slot to the UE.

[0022] In another aspect of the present disclosure, a terminal (UE) for transmitting a physical uplink control channel (PUCCH) to a base station in a wireless communication system is provided. The UE may include: a receiver; a transmitter; and a processor connected to the receiver and the transmitter. The processor may be configured to: determine a sequence hopping pattern based on a frequency hopping index determined according to whether frequency hopping is configured in a time slot; and transmit a first PUCCH including a demodulation reference signal (DM-RS) to which the determined sequence hopping pattern is applied, or a second PUCCH to which the determined sequence hopping pattern is applied.

[0023] In another aspect of the present disclosure, a base station for receiving a physical uplink control channel (PUCCH) from a user equipment (UE) in a wireless communication system is provided. The base station may include: a receiver; a transmitter; and a processor connected to the receiver and the transmitter. The processor may be configured to receive, from the UE, a first PUCCH including a demodulation reference signal (DM-RS) to which a specific sequence hopping pattern is applied, or a second PUCCH to which a specific sequence hopping pattern is applied. In this case, the specific sequence hopping pattern may be determined based on a frequency hopping index determined according to whether frequency hopping is configured in a time slot.

[0024] It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed.

[0025] Beneficial effects

[0026] As apparent from the above description, the embodiments of the present disclosure have the following effects.

[0027] According to the present disclosure, a sequence applied to a DM-RS transmitted with a PUCCH or a PUCCH may have various hopping patterns based on the presence of frequency hopping and / or a slot index.

[0028] Therefore, according to the present disclosure, interference between neighboring cells can be mitigated by randomizing the interference between neighboring cells.

[0029] The effects that can be achieved by the embodiments of the present disclosure are not limited to the effects specifically described above, and those skilled in the art can derive other effects not described herein from the following detailed description. In other words, it should be noted that those skilled in the art can derive undesirable effects of the present disclosure from the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are included to provide a further understanding of the present invention and, together with the detailed description, provide embodiments of the present disclosure. However, the technical features of the present disclosure are not limited to the specific drawings. The features disclosed in each of these drawings can be combined with each other to configure new embodiments. The reference numerals in each figure correspond to the structural elements.

[0031] Figure 1 is a diagram illustrating a physical channel and a signal transmission method using the physical channel;

[0032] Figure 2 is a diagram illustrating an exemplary radio frame structure;

[0033] Figure 3 is a diagram illustrating an exemplary resource grid for the duration of a downlink time slot;

[0034] Figure 4 is a diagram illustrating an exemplary structure of an uplink subframe;

[0035] Figure 5 is a diagram illustrating an exemplary structure of a downlink subframe;

[0036] Figure 6 is a diagram illustrating a self-contained subframe structure applicable to the present disclosure;

[0037] Figure 7 and Figure 8 is a diagram illustrating a representative connection method for connecting a TXRU to an antenna unit;

[0038] Figure 9 is a schematic diagram illustrating a hybrid beamforming structure according to an embodiment of the present invention in terms of TXRU and physical antennas;

[0039] Figure 10 is a diagram schematically illustrating a beam scanning operation for synchronization signals and system information during a downlink (DL) transmission procedure according to an embodiment of the present disclosure;

[0040] Figures 11 to 15 is a diagram illustrating various sequence / sequence group / CS hopping support methods according to the present disclosure;

[0041] Figure 16 is a flowchart illustrating a PUCCH transmission method performed by a user equipment according to the present disclosure; and

[0042] Figure 17 is a diagram illustrating the configuration of a user equipment and a base station for implementing the proposed embodiment. DETAILED DESCRIPTION

[0043] The embodiments of the present disclosure described below are combinations of elements and features of the present disclosure in a specific form. Unless otherwise stated, it can be considered that an element or feature is selective. Each element or feature can be put into practice without being combined with other elements or features. In addition, the embodiments of the present disclosure can be constructed by combining parts of elements and / or features. The order of operations described in the embodiments of the present disclosure can be rearranged. Some structures or elements of any one embodiment can be included in another embodiment, and can be replaced with the corresponding structures or features of another embodiment.

[0044] In the description of the drawings, detailed description of known processes or steps of the present disclosure will be avoided to avoid obscuring the subject matter of the present disclosure. In addition, processes or steps that can be understood by those skilled in the art will not be described.

[0045] Throughout the specification, when a part “includes” or “comprises” a component, this does not exclude other components, and other components may be further included unless otherwise specified. The terms “unit”, “-or / er” and “module” described in the specification indicate a unit for processing at least one function or operation, which may be implemented by hardware, software or a combination thereof. In addition, unless otherwise indicated in the specification or unless the context clearly indicates otherwise, the terms “a or an”, “one”, “the” and the like may include both singular and plural expressions in the context of the present disclosure (more specifically, in the context of the appended claims).

[0046] In the embodiments of the present disclosure, the description mainly consists of the data transmission and reception relationship between the base station (BS) and the user equipment (UE). The BS refers to the terminal node of the network that directly communicates with the UE. The specific operations described as being performed by the BS can be performed by the upper layer node of the BS.

[0047] That is, it is apparent that in a network composed of a plurality of network nodes including a BS, various operations performed for communication with a UE may be performed by the BS or network nodes other than the BS. The term "BS" may be replaced with a fixed station, a Node B, an evolved Node B (eNode B or eNB), an advanced base station (ABS), an access point, etc.

[0048] In the embodiments of the present disclosure, the term terminal may be replaced with UE, mobile station (MS), subscriber station (SS), mobile subscriber station (MSS), mobile terminal, advanced mobile station (AMS), etc.

[0049] The transmitting end is a fixed and / or mobile node that provides data services or voice services, and the receiving end is a fixed and / or mobile node that receives data services or voice services. Therefore, on the uplink (UL), the UE can be used as the transmitting end and the BS can be used as the receiving end. Similarly, on the downlink (DL), the UE can be used as the receiving end and the BS can be used as the transmitting end.

[0050] The embodiments of the present disclosure may be supported by at least one of the disclosed standard specifications for wireless access systems including the following items: Institute of Electrical and Electronics Engineers (IEEE) 802.xx system, 3rd Generation Partnership Project (3GPP) system, 3GPP Long Term Evolution (LTE) system, 3GPP 5G NR system, and 3GPP2 system. Specifically, the embodiments of the present disclosure may be supported by the following standard specifications: 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321, 3GPP TS 36.331, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321, and 3GPP TS 38.331. That is, the steps or parts that are not described in the embodiments of the present disclosure to clearly reveal the technical concept of the present disclosure may be explained by the above-mentioned standard specifications. All terms used in the embodiments of the present disclosure may be interpreted by standard specifications.

[0051] The detailed description given below with reference to the accompanying drawings is intended to explain exemplary embodiments of the present disclosure rather than to show the only embodiments that can be implemented according to the present disclosure.

[0052] The following detailed description includes specific terms in order to provide a thorough understanding of the present disclosure. However, it is obvious to those skilled in the art that other terms can be used to replace specific terms without departing from the technical spirit and scope of the present disclosure.

[0053] Hereinafter, a 3GPP LTE / LTE-A system and a 3GPP NR system, which are examples of wireless access systems, are explained.

[0054] The embodiments of the present disclosure can be applied to various wireless access systems, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc.

[0055] CDMA can be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented as a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc.

[0056] UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP LTE is part of the Evolved UMTS (E-UMTS) using E-UTRA, adopting OFDMA for DL and SC-FDMA for UL. LTE-Advanced (LTE-A) is an evolution of 3GPP LTE.

[0057] Although the embodiments of the present disclosure are described based on the 3GPP NR system and the 3GPP / LTE-A system to illustrate the technical features of the present disclosure, the present disclosure is also applicable to the IEEE 802.16e / system and the like.

[0058] 1.3GPP LTE / LTE-A systems

[0059] 1.1. Physical Channel and Signal Transmission and Reception Method Using the Physical Channel

[0060] In a wireless access system, a UE receives information from an eNB on the downlink (DL) and transmits information to the eNB on the uplink (UL). Information sent and received between the UE and eNB includes general data and various types of control information. Numerous physical channels exist depending on the type and purpose of the information sent and received between the eNB and UE.

[0061] Figure 1 Physical channels that can be used in embodiments of the present disclosure and a general signal transmission method using the physical channels are illustrated.

[0062] When a UE is powered on or enters a new cell, it performs an initial cell search (S11). The initial cell search involves acquiring synchronization with the eNB. Specifically, the UE synchronizes its timing with the eNB and acquires information such as the cell identifier (ID) by receiving the Primary Synchronization Channel (P-SCH) and Secondary Synchronization Channel (S-SCH) from the eNB.

[0063] The UE can then obtain information broadcast in the cell by receiving a physical broadcast channel (PBCH) from the eNB.

[0064] During the initial cell search, the UE may monitor the DL channel status by receiving a downlink reference signal (DL RS).

[0065] After the initial cell search, the UE may acquire more detailed system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on information of the PDCCH (S12).

[0066] To complete the connection with the eNB, the UE may perform a random access procedure with the eNB (S13 to S16). During the random access procedure, the UE may transmit a preamble on a physical random access channel (PRACH) (S13) and may receive a PDCCH and a PDSCH associated with the PDCCH (S14). In the case of contention-based random access, the UE may additionally perform a contention resolution procedure, including transmitting an additional PRACH (S15) and receiving a PDCCH signal and a PDSCH signal corresponding to the PDCCH signal (S16).

[0067] In a general UL / DL signal transmission process, after the above process, the UE may receive PDCCH and / or PDSCH from the eNB (S17), and send a physical uplink shared channel (PUSCH) and / or a physical uplink control channel (PUCCH) to the eNB (S18).

[0068] The control information sent by the UE to the eNB is generally called uplink control information (UCI). UCI includes hybrid automatic repeat request acknowledgement / negative acknowledgement (HARQ-ACK / NACK), scheduling request (SR), channel quality indicator (CQI), precoding matrix index (PMI), rank indicator (RI), etc.

[0069] In LTE systems, UCI is typically transmitted periodically on the PUCCH. However, if control information and traffic data should be transmitted simultaneously, the control information and traffic data can be transmitted on the PUSCH. In addition, UCI can be transmitted aperiodically on the PUSCH after receiving a request / command from the network.

[0070] 1.2. Resource Structure

[0071] Figure 2 An exemplary radio frame structure used in the embodiments of the present disclosure is shown.

[0072] Figure 2 (a) shows a frame structure type 1. The frame structure type 1 is applicable to a full frequency division duplex (FDD) system and a half FDD system.

[0073] A radio frame is 10ms (Tf=307200·Ts) long and includes 20 time slots of equal size indexed from 0 to 19. Each time slot is 0.5ms (Tslot=15360·Ts) long. A subframe includes two consecutive time slots. The i-th subframe includes the 2i-th and (2i+1)-th time slots. That is, a radio frame includes 10 subframes. The time required to send one subframe is defined as the transmission time interval (TTI). Ts is the sampling time given by Ts=1 / (15kHz×2048)=3.2552×10-8 (about 33ns). A time slot includes multiple orthogonal frequency division multiplexing (OFDM) symbols or SC-FDMA symbols in the time domain and multiple resource blocks (RBs) in the frequency domain.

[0074] A slot consists of multiple OFDM symbols in the time domain. Since OFDMA is adopted for DL in the 3GPP LTE system, one OFDM symbol represents one symbol period. An OFDM symbol may be referred to as an SC-FDMA symbol or a symbol period. An RB is a resource allocation unit that includes multiple consecutive subcarriers in a slot.

[0075] In a full FDD system, each of the 10 subframes can be used for both DL and UL transmissions during a 10ms duration. The DL and UL transmissions are distinguished by frequency. On the other hand, in a half FDD system, the UE cannot transmit and receive simultaneously.

[0076] The above radio frame structure is purely exemplary.Thus, the number of subframes in a radio frame, the number of slots in a subframe, and the number of OFDM symbols in a slot may be changed.

[0077] Figure 2 (b) shows frame structure type 2. Frame structure type 2 is applied to time division duplex (TDD) systems. A radio frame is 10 ms long (Tf = 307200·Ts) and includes two half-frames, each of which is 5 ms long (= 153600·Ts). Each half-frame includes five subframes, each of which is 1 ms long (= 30720·Ts). The i-th subframe includes the 2i-th and (2i+1)-th time slots, each of which is 0.5 ms long (Tslot = 15360·Ts). Ts is the sampling time given by Ts = 1 / (15 kHz × 2048) = 3.2552 × 10-8 (approximately 33 ns).

[0078] Type 2 frames include a special subframe with three fields: Downlink Pilot Time Slot (DwPTS), Guard Period (GP), and Uplink Pilot Time Slot (UpPTS). DwPTS is used for initial cell search, synchronization, or channel estimation at the UE, and UpPTS is used for channel estimation at the eNB and UL transmission synchronization with the UE. GP is used to eliminate UL interference between the UL and DL caused by multipath delay of the DL signal.

[0079] The following [Table 1] lists the special subframe configuration (DwPTS / GP / UpPTS length).

[0080] [Table 1]

[0081]

[0082] In addition, in LTE Release-13 systems, the configuration of special subframes (i.e., the length of DwPTS / GP / UpPTS) can be newly configured by considering the number X of additional SC-FDMA symbols, where X is provided by a higher-layer parameter named "srs-UpPtsAdd" (if this parameter is not configured, X is set to 0). In LTE Release-14 systems, special subframe configuration #10 is newly added. For special subframe configurations {3, 4, 7, 8} for normal cyclic prefix in the downlink and special subframe configurations {2, 3, 5, 6} for extended cyclic prefix in the downlink, the UE is not expected to be configured with two additional UpPTS SC-FDMA symbols. For special subframe configurations {1, 2, 3, 4, 6, 7, 8} for normal cyclic prefix in the downlink and special subframe configurations {1, 2, 3, 5, 6} for extended cyclic prefix in the downlink, the UE is not expected to be configured with four additional UpPTS SC-FDMA symbols.

[0083] [Table 2]

[0084]

[0085] Figure 3 FIG. 1 illustrates an exemplary structure of a DL resource grid for the duration of one DL slot that may be used in embodiments of the present disclosure.

[0086] refer to Figure 3 A DL slot includes multiple OFDM symbols in the time domain. One DL slot includes 7 OFDM symbols in the time domain, and an RB includes 12 subcarriers in the frequency domain, but the present disclosure is not limited thereto.

[0087] Each element of the resource grid is called a resource element (RE). An RB includes 12×7 REs. The number N DL of RBs in a DL slot depends on the DL transmission bandwidth.

[0088] Figure 4 The diagram illustrates the structure of a UL subframe that may be used in embodiments of the present disclosure.

[0089] refer to Figure 4 , the UL subframe can be divided into a control region and a data region in the frequency domain. The PUCCH carrying UCI is allocated to the control region, and the PUSCH carrying user data is allocated to the data region. To maintain the single-carrier attribute, the UE does not transmit the PUCCH and PUSCH at the same time. A pair of RBs in a subframe is allocated to the PUCCH for the UE. The RBs of the RB pair occupy different subcarriers in the two time slots. Therefore, it can be said that the RB pair hops on the time slot boundary.

[0090] Figure 5 FIGURE 1 illustrates the structure of a DL subframe that may be used in embodiments of the present disclosure.

[0091] refer to Figure 5 , up to three OFDM symbols of a DL subframe starting from OFDM symbol 0 are used as a control region to which control channels are allocated, and the other OFDM symbols of the DL subframe are used as a data region to which PDSCH is allocated. DL control channels defined for the 3GPP LTE system include the Physical Control Format Indicator Channel (PCFICH), the PDCCH, and the Physical Hybrid ARQ Indicator Channel (PHICH).

[0092] The PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols used to transmit control channels in the subframe (i.e., the size of the control region). The PHICH is a response channel for UL transmissions, delivering HARQ ACK / NACK signals. The control information carried on the PDCCH is called downlink control information (DCI). DCI transmits UL resource allocation information, DL resource allocation information, or UL transmit (Tx) power control commands for a group of UEs.

[0093] 1.3.CSI Feedback

[0094] In 3GPP LTE or LTE-A systems, it has been defined that a user equipment (UE) reports channel state information (CSI) to a base station (BS) (or eNB). Here, CSI means information indicating the quality of a radio channel (or link) formed between the UE and an antenna port.

[0095] For example, the CSI may include a rank indicator (RI), a precoding matrix indicator (PMI), and a channel quality indicator (CQI).

[0096] RI indicates rank information about the corresponding channel, which means the number of streams received by the UE using the same time-frequency resources. This value depends on the long-term fading of the channel. In addition, RI can be fed back to the BS by the UE with a longer period than PMI or CQI.

[0097] The PMI is a value reflecting characteristics of a channel space and indicates a precoding index preferred by the UE based on a metric such as SINR.

[0098] The CQI is a value indicating channel strength, and indicates a reception SINR that can be obtained when the BS uses the PMI.

[0099] In 3GPP LTE or LTE-A systems, a base station (BS) can configure multiple CSI processes for a UE and receive CSI reports from the UE regarding each process. Each CSI process is configured with a CSI-RS (CSI-RS) for specifying the signal quality from the BS and a CSI-Interference Measurement (CSI-IM) resource for interference measurement.

[0100] RRM Measurement

[0101] The LTE system supports radio resource management (RRM) operations, including power control, scheduling, cell search, cell reselection, handover, radio link or connection monitoring, and connection establishment / reestablishment. In this operation, the serving cell can request RRM measurement information from the UE, which is a measurement value used to perform RRM operations. As typical information, in the LTE system, the UE can measure information such as cell search information, reference signal received power (RSRP), and reference signal received quality (RSRQ) about each cell, and report it as typical information. Specifically, in the LTE system, the UE can receive "measConfig" from the serving cell through a higher layer signal for RRM measurement, and measure RSRP or RSRQ based on the information of "measConfig".

[0102] Here, RSRP, RSRQ, and RSSI disclosed in the LTE system may be defined as follows.

[0103] First, the reference signal received power (RSRP) is defined as the linear average of the power contributions (in [W]) of the resource elements carrying cell-specific reference signals within the measurement frequency bandwidth considered. For example, for RSRP determination, the cell-specific reference signal R0 should be used. If the UE can reliably detect that R1 is available, R1 can be used in addition to R0 to determine RSRP. The reference point for RSRP should be the UE's antenna connector.

[0104] The reference point for RSRP should be the UE's antenna connector.

[0105] If the UE is using receiver diversity, the reported value should not be lower than the corresponding RSRP of any individual diversity branch.

[0106] Reference Signal Received Quality (RSRQ) is defined as the ratio N × RSRP / (E-UTRA carrier RSSI), where N is the number of RBs in the E-UTRA carrier RSSI measurement bandwidth. The measurements of the numerator and denominator shall be performed on the same set of resource blocks.

[0107] The E-UTRA carrier received signal strength indicator (RSSI) consists of the linear average of the total received power (in [W]) observed by the UE over N resource blocks in the measurement bandwidth only in OFDM symbols containing reference symbols for antenna port 0 from all sources including co-channel serving and non-serving cells; adjacent channel interference; thermal noise, etc. If higher layer signaling indicates certain subframes for performing RSRQ measurements, the RSSI is measured over all OFDM symbols in the indicated subframes.

[0108] The reference point for RSRQ shall be the UE's antenna connector.

[0109] If the UE is using receiver diversity, the reported value should not be lower than the corresponding RSRQ of any individual diversity branch.

[0110] Next, the received signal strength indicator (RSSI) is defined as the received wideband power, including thermal noise and noise generated in the receiver within the bandwidth defined by the receiver pulse-shaping filter.

[0111] The reference point for the measurement shall be the UE's antenna connector.

[0112] If the UE is using receiver diversity, the reported value shall not be lower than the corresponding UTRA carrier RSSI of any individual receive antenna branch.

[0113] According to the above definition, in the case of intra-frequency measurement, a UE operating in an LTE system can measure RSRP in a bandwidth indicated by an Allowed Measurement Bandwidth Related Information Element (IE) transmitted on System Information Block Type 3 (SIB3). Alternatively, in the case of inter-frequency measurement, the UE can measure RSRP in a bandwidth corresponding to one of 6, 15, 25, 50, 75, and 100 resource blocks (RBs) indicated by an Allowed Measurement Bandwidth transmitted in SIB5. Alternatively, in the absence of an IE, the UE can measure RSRP in the frequency band of the entire downlink (DL) system as a default operation.

[0114] In this case, if the UE receives information about the allowed measurement bandwidth, the UE can regard the corresponding value as the maximum measurement bandwidth and freely measure the RSRP value within the range of the corresponding value. However, if the serving cell sends an IE defined as WB-RSRQ to the UE and the allowed measurement bandwidth is set to 50 RBs or more, the UE will calculate the RSRP value for the entire allowed measurement bandwidth. In RSSI measurement, the UE uses the frequency band of the UE's receiver to measure RSSI according to the definition of the RSSI bandwidth.

[0115] 2. New radio access technology systems

[0116] As many communication devices require higher communication capacity, the need for mobile broadband communications, which significantly improves the performance of existing radio access technologies (RATs), has increased. Furthermore, there is a growing demand for large-scale machine-type communications (MTC), which can connect multiple devices or objects to provide various services at any time and anywhere. Furthermore, communication system designs that can support services and users that are sensitive to reliability and latency have been proposed.

[0117] As a new RAT considering enhanced mobile broadband communication, massive MTC and ultra-reliable and low-latency communication (URLLC), a new RAT system has been proposed. In this disclosure, for convenience of description, the corresponding technology is referred to as a new RAT or a new radio (NR).

[0118] Parameter Set

[0119] The NR system to which the present disclosure applies supports various OFDM parameter sets shown in the following table. In this case, the value of μ and cyclic prefix information for each carrier bandwidth part can be signaled in the DL and UL, respectively. For example, the value of μ and cyclic prefix information for each downlink carrier bandwidth part can be signaled via DL-BWP-mu and DL-MWP-cp corresponding to higher layer signaling. As another example, the value of μ and cyclic prefix information for each uplink carrier bandwidth part can be signaled via UL-BWP-mu and UL-MWP-cp corresponding to higher layer signaling.

[0120] [Table 3]

[0121] μ <![CDATA[Δf=2 μ ·15[kHz]]]> cyclic prefix 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0122] Frame structure

[0123] DL and UL transmissions are configured with frames of length 10ms. Each frame may consist of ten subframes, each of which has a length of 1ms. In this case, the number of consecutive OFDM symbols in each subframe is

[0124] In addition, each subframe may be composed of two half-frames of the same size, in which case the two half-frames are composed of subframes 0 to 4 and subframes 5 to 9, respectively.

[0125] With respect to the subcarrier spacing μ, the slots may be numbered within a subframe in ascending order as follows: And they can also be numbered in ascending order within the frame as follows: In this case, the number of consecutive OFDM symbols in a time slot can be determined based on the cyclic prefix As shown in the following table. The starting time slot of a subframe The starting OFDM symbol of the same subframe in the time dimension Table 4 shows the number of OFDM symbols in each slot / frame / subframe in case of a normal cyclic prefix, and Table 5 shows the number of OFDM symbols in each slot / frame / subframe in case of an extended cyclic prefix.

[0126] [Table 4]

[0127]

[0128] [Table 5]

[0129]

[0130] In the NR system to which the present disclosure is applicable, a self-contained time slot structure can be applied based on the above-mentioned time slot structure.

[0131] Figure 6 is a diagram illustrating a self-contained time slot structure suitable for use with the present disclosure.

[0132] exist Figure 6 , the hatched area (eg, symbol index = 0) indicates the downlink control region, and the black area (eg, symbol index = 13) indicates the uplink control region. The remaining area (eg, symbol index = 1 to 13) can be used for DL data transmission or UL data transmission.

[0133] Based on this structure, the eNB and UE can sequentially perform DL transmission and UL transmission in a single time slot. That is, the eNB and UE can transmit and receive not only DL data but also UL ACK / NACK in response to the DL data in a single time slot. Therefore, this structure reduces the time required for data retransmission in the event of a data transmission error, thereby minimizing the delay in the final data transmission.

[0134] In this self-contained slot structure, a predetermined time interval is required to allow the eNB and UE to switch from transmit mode to receive mode, and vice versa. To this end, in the self-contained slot structure, some OFDM symbols at the time of switching from DL to UL are set as guard periods (GPs).

[0135] Although it is described that the self-contained slot structure includes both the DL control region and the UL control region, these control regions may be selectively included in the self-contained slot structure. In other words, the self-contained slot structure according to the present disclosure may include either the DL control region or the UL control region, or both the DL control region and the UL control region, such as Figure 6 shown.

[0136] In addition, for example, the time slot can have various time slot formats. In this case, the OFDM symbol in each time slot can be divided into downlink symbols (represented by "D"), flexible symbols (represented by "X"), and uplink symbols (represented by "U").

[0137] Therefore, the UE may assume that DL transmissions occur only in symbols denoted by "D" and "X" in the DL slot. Similarly, the UE may assume that UL transmissions occur only in symbols denoted by "U" and "X" in the UL slot.

[0138] 2.3. Analog Beamforming

[0139] In millimeter wave (mmW) systems, due to the short wavelength, multiple antenna units can be installed in the same area. That is, considering that the wavelength in the 30GHz band is 1cm, in the case of a two-dimensional array, a total of 100 antenna units can be installed in a 5cm*5cm panel at intervals of 0.5λ (wavelength). Therefore, in mmW systems, it is possible to improve coverage or throughput by increasing beamforming (BF) gain using multiple antenna units.

[0140] In this case, each antenna unit may include a transceiver unit (TXRU) to enable adjustment of the transmit power and phase of each antenna unit. By doing so, each antenna unit can perform independent beamforming per frequency resource.

[0141] However, installing TXRUs in all approximately 100 antenna elements is not cost-effective. Therefore, a method has been considered to use analog phase shifters to map multiple antenna elements to a single TXRU and adjust the beam direction. However, because only one beam direction is generated across the entire frequency band, this method has the disadvantage that frequency-selective beamforming is not possible.

[0142] To address this issue, as an intermediate form between digital BF and analog BF, hybrid BF with B TXRUs, which has fewer than Q antenna elements, can be considered. In the case of hybrid BF, the number of beam directions that can be transmitted simultaneously is limited to B or less, depending on how the B TXRUs and Q antenna elements are connected.

[0143] Figure 7 and Figure 8 is a diagram illustrating a representative method for connecting a TXRU to an antenna unit. Here, the TXRU virtualization model represents the relationship between the TXRU output signal and the antenna unit output signal.

[0144] Figure 7 A method for connecting the TXRU to the subarray is shown. Figure 7 In the example, one antenna unit is connected to one TXRU.

[0145] at the same time, Figure 8 A method for connecting all TXRUs to all antenna elements is shown. Figure 8 In this case, a separate additional unit is required to connect all antenna elements to all TXRUs, such as Figure 8 shown.

[0146] exist Figure 7 and Figure 8 In this example, W indicates the phase vector weighted by the analog phase shifter. That is, W is the primary parameter that determines the direction of analog beamforming. In this case, the mapping between CSI-RS antenna ports and TXRUs can be 1:1 or 1:many.

[0147] Figure 7 The configuration shown in has a disadvantage in that beamforming focusing is difficult to achieve, but has an advantage in that all antennas can be configured at a low cost.

[0148] on the contrary, Figure 8 The advantage of the configuration shown in [1] is that beamforming focusing can be easily achieved. However, it has the disadvantage of high cost since all antenna elements are connected to the TXRU.

[0149] When multiple antennas are used in an NR system to which the present disclosure is applicable, a hybrid beamforming method obtained by combining digital beamforming and analog beamforming can be applied. In this case, analog (or radio frequency (RF)) beamforming means performing a precoding (or combining) operation at the RF end. In the case of hybrid beamforming, precoding (or combining) is performed at the baseband end and the RF end, respectively. Therefore, the advantage of hybrid beamforming is that while reducing the number of RF chains and the number of D / A (digital-analog) or A / D (analog-digital) z converters, performance similar to that of digital beamforming is guaranteed.

[0150] For ease of description, the hybrid beamforming structure can be represented by N transceiver units (TXRUs) and M physical antennas. In this case, the digital beamforming for L data layers to be transmitted by the transmitter can be represented by an N*L (N×L) matrix. The N converted digital signals are then converted into analog signals by the TXRU, and analog beamforming, which can be represented by an M*N (M×N) matrix, is then applied to the converted signals.

[0151] Figure 9 : is a schematic diagram illustrating a hybrid beamforming structure according to an embodiment of the present invention in terms of TXRU and physical antennas. Figure 9 In , it is assumed that the number of digital beams is L and the number of analog beams is N.

[0152] In addition, a method for providing effective beamforming to UEs located in a specific area by designing an eNB capable of changing analog beamforming based on symbols has been considered in an NR system to which the present invention applies. In addition, a method for introducing multiple antenna panels has been considered in an NR system to which the present disclosure applies, where independent hybrid beamforming can be applied by defining N TXRUs and M RF antennas as one antenna panel.

[0153] When the eNB uses multiple analog beams as described above, each UE has a different analog beam suitable for signal reception. Therefore, in the NR system to which the present disclosure is applicable, a beam sweeping operation has been considered, in which the eNB applies a different analog beam per symbol in a specific subframe (SF) (at least for synchronization signals, system information, paging, etc.) and then performs signal transmission to allow all UEs to have a reception opportunity.

[0154] Figure 10 is a diagram schematically illustrating a beam scanning operation for synchronization signals and system information during a downlink (DL) transmission procedure according to an embodiment of the present disclosure.

[0155] exist Figure 10In the NR system, the physical resource (or channel) used to broadcast system information of the NR system to which the present disclosure is applicable is called a physical broadcast channel (xPBCH). In this case, analog beams belonging to different antenna panels can be transmitted simultaneously in one symbol.

[0156] In addition, the introduction of a beam reference signal (BRS) corresponding to a reference signal (RS) to which a single analog beam (corresponding to a specific antenna panel) is applied as a configuration for measuring a channel per analog beam in an NR system that can be used in the present disclosure has been discussed. BRS can be defined for multiple antenna ports, and each BRS antenna port can correspond to a single analog beam. In this case, in contrast to BRS, all analog beams in the analog beam group can be applied to the synchronization signal or xPBCH to help random UEs correctly receive the synchronization signal or xPBCH.

[0157] 3. Proposed Examples

[0158] Hereinafter, embodiments of the present disclosure will be described in detail based on the above technical features.

[0159] Specifically, a wireless communication system including a base station and a user equipment terminal (UE) may support multiple sequence groups, each of which consists of one or more base sequences. In this case, after selecting a specific base sequence from the multiple sequence groups, the UE may generate a sequence by applying a (time or frequency domain) cyclic shift (CS) and use the generated sequence for an UL control signal and / or an UL reference signal (RS) (based on the sequence selection). With respect to the above-mentioned UE operation, the present disclosure proposes a method for changing the sequence group index and / or CS index offset value for each time and / or frequency resource unit based on a specific hopping pattern.

[0160] For the convenience of description, the operation of changing the sequence group for each specific resource unit is called "sequence group hopping".

[0161] In addition, the operation of changing the base sequence (in the same sequence group) for each specific resource unit is called "sequence hopping".

[0162] Furthermore, the operation of changing the CS value (applied to the same basic sequence) for each specific resource unit is called "CS hopping".

[0163] The NR system to which the present disclosure is applicable is intended to support multiple logical networks in a single physical system. Therefore, it is designed to support services with various requirements (e.g., enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra-reliable low latency communication (URLLC), etc.). In addition, the NR system is designed to support a PUCCH consisting of a relatively large number of OFDM symbols (e.g., 4 or more symbols) to support large UL coverage (hereinafter, long PUCCH) and a PUCCH consisting of a relatively small number of OFDM symbols (e.g., 1 or 2 symbols) to support low-latency transmission (hereinafter, short PUCCH) as the PUCCH of the physical channel for UCI transmission.

[0164] The short PUCCH can have at least one transmission structure. For example, if the UCI to be transmitted on the short PUCCH has a small amount of information (e.g., 1 or 2 bits), the BS can allocate a sequence set consisting of multiple sequences to the UE as short PUCCH resources, and the UE can perform transmission by selecting a specific sequence corresponding to the UCI to be transmitted from the sequences allocated as short PUCCH resources. In this case, the sequence can be designed to meet the low peak power to average power ratio (PAPR) characteristic.

[0165] For the convenience of description, the above sequence-based short PUCCH is named "SEQ-PUCCH".

[0166] The above-mentioned sequence group hopping, sequence hopping and / or CS hopping can be applied to the sequence of the SEQ-PUCCH of the NR system to which the present disclosure is applicable.

[0167] Therefore, the present disclosure proposes a method for changing the sequence group index and / or CS index offset value of such a SEQ-PUCCH for each time and / or frequency resource unit based on a specific hopping pattern when a plurality of sequence groups each consisting of one or more base sequences is defined in an NR system.

[0168] Although the operations of the present disclosure are described in terms of sequence hopping, the operations can be applied to resource hopping. In other words, the "sequence" mentioned in the present disclosure can also be interpreted as "resource".

[0169] Here, the sequence modulation-based PUCCH may mean a PUCCH that carries UCI by multiplying a sequence and a modulation symbol (eg, binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), etc.).

[0170] In the present disclosure, multiple sequence groups may be defined, each consisting of one or more base sequences applicable to a SEQ-PUCCH (or UL DM-RS or sequence-modulated PUCCH), and the sequence group (or sequence group index) to which a base sequence applicable to a SEQ-PUCCH (or UL DM-RS or sequence-modulated PUCCH) to be transmitted in a specific resource unit belongs may be determined based on an output value of a first specific function having an initial value as input and information about the corresponding resource unit. For ease of description, the first function is named "sequence group hopping pattern."

[0171] In addition, the base sequence applicable to the SEQ-PUCCH (or UL DM-RS or sequence-modulated PUCCH) to be transmitted in a specific resource unit can be limited to those belonging to the same sequence group, and the base sequence selected from the sequence group can be determined based on the output value of a second specific function having an input of an initial value and information about the corresponding resource unit. For ease of description, the second function is referred to as a "sequence hopping pattern."

[0172] In addition, the CS value (or CS offset value) of the base sequence of the SEQ-PUCCH (or UL DM-RS or sequence-modulated PUCCH) to be transmitted in a specific resource unit can be determined based on the output value of a third function having an input of an initial value and information about the index of the corresponding resource unit. For ease of description, the third function is named "CS hopping pattern".

[0173] In the present disclosure, a time slot may mean a basic time unit for scheduling, and one time slot may be composed of a plurality of mini-time slots.

[0174] In addition, a UL control resource set may mean a time-frequency resource region used to transmit UL control information such as PUCCH, etc. The BS may configure one or more different UL control resource sets for a specific UE within the system bandwidth.

[0175] 3.1. First Sequence / Sequence Group / CS Hopping Support Method

[0176] The BS may configure for the UE whether to apply (ie, enable or disable) the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) for SEQ-PUCCH (or UL DM-RS or sequence modulation-based pattern) using one of the following methods.

[0177] (1) Whether this mode is applied is configured by the physical broadcast channel (PBCH) and / or the system information block (SIB) (or system information).

[0178] - Whether this mode is applied (for each UL control resource set) is configured by (UE-specific) Radio Resource Control (RRC) signaling.

[0179] In an NR system to which the present disclosure is applicable, a UE may not always support signal transmission and reception across the entire system bandwidth. In other words, the UE may have a radio frequency (RF) circuit with a bandwidth smaller than the entire system bandwidth. Therefore, when the UE transmits UL control information such as the PUCCH, it may be difficult to define the cell-common UL control transmission region, which is already used in the LTE system, in the NR system to which the present disclosure is applicable.

[0180] At least one UL control resource set can be flexibly configured in the NR system to which the present disclosure is applied. In this case, whether to apply the sequence group hopping mode (or sequence hopping mode or CS hopping mode) can be independently configured for each UL control resource set. The configuration information can be sent to the UE in common through system information such as SIB, or can be sent via (UE-specific) RRC signaling.

[0181] Unless they conflict with each other, the above-mentioned first sequence / sequence group / CS hopping support method can be applied together with other proposed methods of the present disclosure.

[0182] 3.2. Second Sequence / Sequence Group / CS Hopping Support Method

[0183] When determining a sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) based on an initial value and index information about a resource unit (in which a sequence is transmitted) (or determining a sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) based on a function having an input of an initial value and index information about a resource unit (in which a sequence is transmitted)), one of the following items or any combination thereof may be used as the index information about the resource unit (in which a sequence is transmitted).

[0184] (1) Time slot index (or micro-time slot index)

[0185] (2) Symbol index

[0186] (3) Physical Resource Block (PRB) Index

[0187] (4) Local symbol index (in UL control region or PUCCH)

[0188] (5) Local PRB index (in UL control region or PUCCH)

[0189] (6)UL Control Resource Set Index

[0190] Here, PRB may mean an index of a frequency-domain resource unit, and a UL control resource set may mean a time-frequency-domain resource region for transmitting UL control (such as PUCCH, etc.).

[0191] Figure 11 The figure schematically illustrates a sequence / sequence group / CS hopping support method according to an embodiment of the present disclosure.

[0192] For example, the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) can be given as a function of f(x) (where x can be a vector), and the function can use the time slot index as input. In this case, the sequence group (or base sequence or CS value) used for SEQ-PUCCH (or UL DM-RS) can be the same within a time slot, but change for each time slot, such as Figure 11 As shown in .

[0193] Figure 12 The following schematically illustrates a sequence / sequence group / CS hopping support method according to another embodiment of the present disclosure.

[0194] As another example, the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) can be given as a function of f(x) (where x can be a vector), and the function can use the symbol index as input. In this case, the sequence group (or base sequence or CS value) used for SEQ-PUCCH (or UL DM-RS) can be changed based on the symbol within the time slot, such as Figure 12 As shown in .

[0195] As another example, the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) may be given as a function of f(x) (where x may be a vector), and the function may use a slot index and a local symbol index (in the UL control region) as inputs. In this case, the local symbol index may be an index defined for the UL control region configured in the current slot or an index defined for a maximum symbol period that can be configured as the UL control region.

[0196] As another example, the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) can be given as a function of f(x) (where x can be a vector), and the function can use a slot index as an input. In addition, the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) can have a different initial value for each symbol.

[0197] For example, in the case of the last symbol in a slot, the slot index may be input to the sequence group hopping mode (or sequence hopping mode or CS hopping mode) after applying the initial value of X0. On the other hand, in the case of the penultimate symbol in a slot, the slot index may be input to the sequence group hopping mode (or sequence hopping mode or CS hopping mode) after applying the initial value of X1.

[0198] In this case, the BS may configure X0 and X1 commonly through system information UEs such as SIB, or UE-specifically through (UE-specific) higher-layer signals such as RRC signaling, etc. In other words, the BS may configure the initial value of the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) for each symbol using a higher-layer signal.

[0199] In addition, when the CS offset value for a specific resource element is determined based on the CS hopping pattern, the SEQ-PUCCH transmitted in the corresponding resource element can represent UCI by selecting one of multiple CS resources. In this case, the value obtained by adding the CS offset value depending on the CS hopping pattern to the CS value selected based on the specific UCI state can be used as the final CS resource.

[0200] Unless they conflict with each other, the above-mentioned second sequence / sequence group / CS hopping support method can be applied together with other proposed methods of the present disclosure.

[0201] 3.3. Third Sequence / Sequence Group / CS Hopping Support Method

[0202] When a sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) is determined using an initial value and index information about a resource unit (in which a sequence is transmitted) as input, the initial value may be configured as follows.

[0203] (1) Before receiving (UE-specific) RRC signaling (i.e., initial access procedure), (1-1) the initial value is configured based on the physical cell ID (PCID) or beam ID detected from the synchronization signal. In this case, the beam ID can be derived from the index of the resource area (dedicated to the synchronization signal).

[0204] (1-2) The initial value is configured based on the virtual cell ID (VCID) or beam ID, which is indicated by the PBCH / SIB / random access response (RAR). In this case, the VCID or beam ID can be configured independently of the PCID.

[0205] (2) After receiving (UE-specific) RRC signaling

[0206] -Configuring the initial value based on a specific seed value configured by the BS. In this case, the BS can configure an independent seed value for each symbol and / or UL control resource set.

[0207] For example, if the UE is to receive (UE-specific) RRC signaling after performing a random access procedure, the UE may obtain an initial value of the sequence group hopping pattern (or sequence hopping pattern or CS frequency hopping pattern) from detected information (from a synchronization signal) or system information such as PBCH / SIB (configured by the BS).

[0208] Alternatively, if the UE is capable of receiving (UE-specific) RRC signaling, the BS can UE-specifically configure the initial value of the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern). In this case, the initial value can be configured independently for each symbol and / or UL control resource set.

[0209] Unless they conflict with each other, the above-mentioned third sequence / sequence group / CS hopping support method can be applied together with other proposed methods of the present disclosure.

[0210] 3.4. Fourth Sequence / Sequence Group / CS Frequency Hopping Support Method

[0211] When a sequence group hopping pattern (or sequence hopping pattern) is applied to a PUCCH, a time unit in which the sequence group hopping pattern (or sequence hopping pattern) is applied may vary according to the number of symbols included in the PUCCH.

[0212] Specifically, the basic transmission unit for long PUCCH can be a time slot (or micro-time slot), while the basic transmission unit for short PUCCH can be a symbol. Therefore, in the case of long PUCCH, a sequence group hopping mode (or sequence hopping mode) can be applied on a time slot basis using a time slot index as input. On the other hand, in the case of short PUCCH, a sequence group hopping mode (or sequence hopping mode) can be applied on a symbol basis using a symbol index as input. In addition, when long PUCCH is transmitted in multiple time slots, a sequence group hopping mode (or sequence hopping mode or CS hopping mode) can be applied on a multi-slot basis using the indices of multiple time slots as input.

[0213] Unless they conflict with each other, the above-mentioned fourth sequence / sequence group / CS hopping support method can be applied together with other proposed methods of the present disclosure.

[0214] 3.5. Fifth Sequence / Sequence Group / CS Frequency Hopping Support Method

[0215] When the sequence group hopping pattern (or the sequence hopping pattern or the CS hopping pattern) is repeated at a predetermined period, the period may be configured as one of the following.

[0216] (1) Fixed duration (corresponding to a radio frame) (e.g., 10ms)

[0217] (2) A duration corresponding to a fixed number of time slots (regardless of the parameter set)

[0218] (3) Duration corresponding to a specific number of time slots (configured by the BS)

[0219] For example, a sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) may be configured to have a period of a specific number of time slots. In this case, regardless of the parameter set, the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) may be configured to always have the same number of time slots as its period.

[0220] Alternatively, as the subcarrier spacing (SCS) increases, the time unit may decrease, and more sequence group hopping patterns (or sequence hopping patterns or CS hopping patterns) may be required. In this case, the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) may be configured to have a fixed period (e.g., 10 ms). That is, as the SCS increases, the number of time slots within the period increases, and thus the number of sequence hopping patterns may increase significantly.

[0221] In the present disclosure, a parameter set may mean the length of a symbol and an SCS in an OFDM structure.

[0222] In addition, for a specific parameter set (or SCS), the period and unit of applying the sequence group hopping mode (or sequence hopping mode or CS hopping mode) can be determined according to one of the following options.

[0223] Figure 13 Schematically illustrates a configuration in which a sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) is applied with a specific period and on a specific basis for a specific parameter set (or SCS) according to an embodiment of the present disclosure. Figure 13 The detailed description is applicable to Option 1 of the present disclosure.

[0224] 1) Option 1: Applying a fixed period and a sequence group hopping mode (or sequence hopping mode or CS hopping mode) with a fixed time unit.

[0225] - For example, the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) may be applied with a period of 10 ms and based on 0.5 ms.

[0226] --In case of SCS=15kHz, a hopping pattern of length 20 is applied and sequence group (or sequence or CS) hopping is performed on a slot basis.

[0227] --In case of SCS=15kHz*N, a hopping pattern of length 20 is applied and sequence group (or sequence or CS) hopping is performed on an N-slot basis.

[0228] - When there are multiple time slots within a fixed time unit, the initial value of the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) can be changed according to the relative positions of the time slots in the fixed time unit.

[0229] When there are multiple time slots within a fixed time unit, additional sequence hopping (e.g., basic sequence hopping in the same sequence group) may be applied to the multiple time slots in the fixed time unit, or an offset value may be applied to the sequence group index based on the (relative) position of the time slots in the fixed time unit.

[0230] Figure 14 Schematically illustrates a configuration in which a sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) is applied with a specific period and on a specific basis for a specific parameter set (or SCS) according to another embodiment of the present disclosure. Figure 14 The detailed description is applicable to Option 2 of the present disclosure.

[0231] (2) Option 2: The sequence group hopping mode (or sequence hopping mode or CS hopping mode) is applied with a fixed period and based on an extendable time unit (depending on the parameter set).

[0232] - For example, the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) may be applied with a period of 10 ms and on a (micro)slot basis (depending on the parameter set).

[0233] --In case of SCS=15kHz, a hopping pattern of length 20 is applied and sequence group (or sequence or CS) hopping is performed on a slot (0.5ms) basis.

[0234] --In case of SCS=15kHz*N, a length (20*N) hopping pattern is applied, and sequence group (or sequence or CS) hopping is performed based on time slot (0.5ms / N).

[0235] Figure 15 Schematically illustrates a configuration in which a sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) is applied with a specific period and on a specific basis for a specific parameter set (or SCS) according to another embodiment of the present disclosure. Figure 15 The detailed description is applicable to Option 3 of the present disclosure.

[0236] (3) Option 3: The sequence group hopping mode (or sequence hopping mode or CS hopping mode) is applied with a period of X scalable time units (depending on the parameter set) (where X is a fixed value) and on a scalable time unit basis (depending on the parameter set).

[0237] - For example, the sequence group hopping pattern (or sequence hopping pattern or CS hopping pattern) can be applied with 20 (mini) slots (depending on the parameter set) and on a (mini) slot basis (depending on the parameter set).

[0238] In the case of SCS=15kHz, a hopping pattern of length 20 is applied, and sequence group (or sequence or CS) hopping is performed based on time slots (0.5ms). In this case, the period can be set to 20 time slots (ie, 10ms).

[0239] In the case of SCS=15kHz*N, a hopping pattern of length 20 is applied and sequence group (or sequence or CS) hopping is performed based on time slots (0.5ms / N). In this case, the period can be set to 20 time slots (10ms / N).

[0240] When there are multiple time periods in a specific fixed duration, additional sequence hopping (e.g., basic sequence hopping in the same sequence group) may be applied to the multiple time periods in the specific fixed duration, or an offset value may be applied to the sequence group index based on the (relative) position of the time periods in the specific fixed duration.

[0241] Unless they conflict with each other, the above-mentioned fifth sequence / sequence group / CS hopping supporting method can be applied together with other proposed methods of the present disclosure.

[0242] 3.6. Sixth Sequence / Sequence Group / CS Hopping Support Method

[0243] When there are N PRBs and M CS values per PRB, L resources for log2(L)-bit SEQ-PUCCH may be allocated as follows.

[0244] (1) The BS configures the values of k0 (e.g., k0∈{0, 1, ..., M*N-1}) and Δk (e.g., Δk∈{1, 2, 3}) for the UE.

[0245] - This information may be configured through higher layer signals such as RRC signaling.

[0246] (2) For p = 0, 1, ..., L-1, the UE can use L CS resources corresponding to k(p) = k0 + Δk*p.

[0247] - In this case, the PRBs and CS resources corresponding to k(p) can be configured as follows.

[0248] --floor(k(p) / M) indicates the index of a specific PRB among N PRBs.

[0249] --k(p) mod M indicates the index of a specific CS in a specific PRB.

[0250] More specifically, considering the resource allocation efficiency of SEQ-PUCCH, if the SEQ-PUCCH is configured using only the sequence corresponding to the CS resource in one PRB, the resource allocation efficiency may be reduced because there are unused CS resources in a specific PRB. Therefore, it may be preferable that the UE configure the SEQ-PUCCH using CS resources in multiple PRBs.

[0251] However, for this purpose, when allocating resources for SEQ-PUCCH, the BS should separately provide the UE with information on PRB resources for each CS (to which the corresponding CS belongs). That is, this operation may not be desirable in terms of signaling overhead.

[0252] Therefore, the present disclosure proposes a method for configuring SEQ-PUCCH using CS resources of multiple PRBs while reducing signaling overhead.

[0253] For example, when each of multiple PRBs has M CS resources, the BS and UE can index the CS resources. Thereafter, if the starting index and gap are configured, the UE can consider: regarding the starting index, for SEQ-PUCCH, L CS resources with an index of p*Gap with p=0, 1, ..., L-1 are allocated.

[0254] Unless they conflict with each other, the above-mentioned sixth sequence / sequence group / CS hopping support method can be applied together with other proposed methods of the present disclosure.

[0255] 3.7. Seventh Sequence / Sequence Group / CS Hopping Support Method

[0256] In the following, it is assumed that a sequence resource set includes N base sequences, and M CSs can be applied to each base sequence. In this case, if the resources in the sequence resource set are used for UCI or DM-RS transmission sequences on a specific UL channel, the operation of changing the base sequence for each specific time resource unit is called "base sequence hopping," and the operation of changing the (applied) CS for each specific time resource unit is called "CS hopping." In addition, the operation of changing the time domain orthogonal cover code (TD-OCC) applied to the UCI or DM-RS on a specific UL channel is called "OCC hopping."

[0257] According to the present disclosure, when the BS indicates a specific initial CS index for the CS hopping pattern, the initial CS index can be used as an input of the CS hopping pattern. In this case, the initial CS index can mean a UE-specific CS offset value added to the cell-specific CS hopping pattern.

[0258] When basic sequence hopping, CS hopping, or TD-OCC hopping is applied to a UL physical channel (e.g., PUCCH, PUSCH, etc.) that can enable or disable frequency hopping in a time slot, at least one of the following parameters may be used as input for the basic sequence hopping mode, CS hopping mode, or TD-OCC hopping mode.

[0259] (1) Time slot index

[0260] (2) OFDM symbol index

[0261] - OFDM symbol index may mean an OFDM symbol index that is fixed for a time slot (regardless of the transmission period of the UL physical channel).

[0262] (3) Frequency Hopping Index

[0263] The frequency hopping index may refer to an index sequentially assigned to each hop when frequency hopping is enabled (e.g., indices 0, 1, 2, ..., K-1 are assigned to K hops). If frequency hopping is disabled, the frequency hopping index may be assumed to be 0. Alternatively, the frequency hopping index may be determined by assuming that the frequency hopping index assigned to the corresponding hop is still applied to the time period (or symbol) corresponding to each hop (when frequency hopping is applied).

[0264] For example, in the case of a basic sequence hopping pattern applied to PUCCH or PUCCH / PUSCH DM-RS (based on sequence selection or sequence modulation), the physical cell ID or the ID configured by the BS can be used as a seed value, and the time slot index can be used as an additional input value (i.e., each time slot has a different basic sequence).

[0265] Similarly, in the case of CS hopping mode, the physical cell ID or the ID configured by the BS may be used as a seed value, and the slot index and / or OFDM symbol index may be used as additional input values (ie, each symbol has a different CS).

[0266] On the other hand, the OCC hopping pattern may be valid only within a time slot. Therefore, the frequency hopping index can be used as the input of the OCC hopping pattern (ie, each hopping frequency (or the virtual time period corresponding to each hopping frequency) has a different OCC).

[0267] In addition, with respect to interference randomization, the seventh sequence / sequence group / CS hopping support method described above can be similarly applied to UCI or data scrambling. That is, if UCI or data scrambling is applied to a UL physical channel (e.g., PUCCH, PUSCH) with frequency hopping enabled or disabled in a time slot, at least one of the following values can be used as input to the scrambling function.

[0268] 1) Time slot index

[0269] 2) OFDM symbol index

[0270] - OFDM symbol index may mean an OFDM symbol index that is fixed for a time slot (regardless of the transmission period of the UL physical channel).

[0271] 3) Frequency Hopping Index

[0272] The frequency hopping index may refer to an index sequentially assigned to each hop when frequency hopping is enabled (e.g., indices 0, 1, 2, ..., K-1 are assigned to K hops). If frequency hopping is disabled, the frequency hopping index may be assumed to be 0. Alternatively, the frequency hopping index may be determined by assuming that the frequency hopping index assigned to the corresponding hop (when frequency hopping is applied) is still applied to the time period (or symbol) corresponding to each hop.

[0273] Unless they conflict with each other, the above-mentioned seventh sequence / sequence group / CS hopping support method can be applied together with other proposed methods of the present disclosure.

[0274] Figure 16 is a flowchart illustrating a PUCCH transmission method performed by a UE according to the present disclosure.

[0275] First, the UE determines a sequence hopping pattern based on a frequency hopping index determined according to whether frequency hopping is configured in a time slot (S1610). Subsequently, the UE transmits a first PUCCH including a DM-RS to which the determined sequence hopping pattern is applied or a second PUCCH to which the determined sequence hopping pattern is applied (S1620).

[0276] For example, when frequency hopping is configured in a time slot, the frequency hopping indexes may be sequentially numbered from 0 to N (where N is a natural number) for hopping in the time slot.

[0277] Specifically, when frequency hopping is applied in a time slot, according to PUCCH (N PUCCH,symb ) symbol length, can be distinguished with ceiling(N PUCCH,symb / 2) and has N PUCCH,symb -ceiling(N PUCCH,symb / 2) of the symbol length.

[0278] As another example, when frequency hopping is not configured in a time slot, the frequency hopping index may be configured as 0.

[0279] In this case, the sequence hopping pattern may be determined based on a combination of a sequence group hopping pattern for selecting one sequence group from a plurality of sequence groups and a base sequence hopping pattern for selecting one base sequence from a plurality of base sequences in a specific sequence group.

[0280] According to the present disclosure, a sequence hopping pattern may be determined based on a time slot index and a frequency hopping index.

[0281] Specifically, as described above, the absolute time length corresponding to a time slot can be configured differently according to the applied parameter set. Therefore, the absolute time unit of the application sequence hopping pattern can be configured differently according to the applied parameter set.

[0282] Because each example of the proposed method can be included as a method for implementing the present disclosure, it is obvious that each example can be regarded as a proposed method. In addition, although the proposed methods can be implemented independently, some of the proposed methods can be combined (or merged) for implementation. In addition, a rule can be defined as follows: information about whether to apply the proposed method (or information about rules related to the proposed method) should be sent from the BS to the UE via a predefined signal (e.g., a physical layer signal, a higher layer signal, etc.).

[0283] 4. Device Configuration

[0284] Figure 17 The diagram illustrates configurations of a UE and a BS for implementing the proposed embodiment. Figure 17 The UE and BS illustrated in FIG. 5 operate to implement an embodiment of the above-described PUCCH transmission and reception method between the UE and the BS.

[0285] The UE 1 can function as a transmitter in the uplink and a receiver in the downlink. The BS (eNB or gNB) 100 can function as a receiver in the uplink and a transmitter in the downlink.

[0286] Each of the UE and the BS may include a transmitter 10 / 110 and a receiver 20 / 120 for controlling transmission and reception of information, data, and / or messages, and an antenna 30 / 130 for transmitting and receiving information, data, and / or messages.

[0287] In addition, each of the UE and the BS may include a processor 40 / 140 for implementing the above-described embodiments of the present disclosure and a memory 50 / 150 for temporarily or permanently storing the operation of the processor 40 / 140 .

[0288] With the above configuration, UE 1 determines a sequence hopping pattern based on a frequency hopping index determined according to whether frequency hopping is configured in a time slot through processor 40. UE 1 then transmits a first PUCCH including a DM-RS to which the determined sequence hopping pattern is applied, or a second PUCCH to which the determined sequence hopping pattern is applied, through transmitter 10.

[0289] BS 100 receives a first PUCCH including a DM-RS to which a specific sequence hopping pattern is applied or a second PUCCH to which a specific sequence hopping pattern is applied from UE 1 through receiver 120. In this case, the specific sequence hopping pattern may be determined based on a frequency hopping index determined according to whether frequency hopping is configured in a slot.

[0290] The transmitter and receiver of each of the UE and the BS may perform packet modulation / demodulation, high-speed packet channel coding, OFDM packet scheduling, TDD packet scheduling, and / or channel multiplexing for data transmission. Figure 17 Each of the UE and the BS may also include a low-power radio frequency (RF) / intermediate frequency (IF) module.

[0291] Meanwhile, the UE may be any one of a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a global system for mobile (GSM) phone, a wideband code division multiple access (WCDMA) phone, a mobile broadband system (MBS) phone, a handheld PC, a laptop PC, a smart phone, a multi-mode multi-band (MM-MB) terminal, and the like.

[0292] A smartphone is a terminal that combines the advantages of both mobile phones and PDAs. It incorporates the functions of a PDA (i.e., schedule management, data communication such as fax transmission and reception, and internet connection) into a mobile phone. An MB-MM terminal is a terminal that has a built-in multi-modem chip and is capable of operating in both mobile internet systems and other mobile communication systems (e.g., CDMA2000, WCDMA, etc.).

[0293] The embodiments of the present disclosure may be implemented by various means (for example, hardware, firmware, software, or a combination thereof).

[0294] In a hardware configuration, the method according to the exemplary embodiments of the present disclosure may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

[0295] In a firmware or software configuration, the method according to the embodiment of the present disclosure may be implemented in the form of a module, procedure, function, etc. that performs the above-mentioned functions or operations. The software code may be stored in the memory 50 or 150 and executed by the processor 40 or 140. The memory is located inside or outside the processor and can send data to and receive data from the processor via various known means.

[0296] It will be apparent to those skilled in the art that the present disclosure may be implemented in other specific ways than those set forth herein without departing from the spirit and essential characteristics of the present disclosure. The above embodiments are therefore to be construed in all respects as illustrative and not restrictive. The scope of the present disclosure should be determined by the appended claims and their legal equivalents, not by the foregoing description, and all changes that come within the meaning and range of equivalence of the appended claims are intended to be included therein. It will be apparent to those skilled in the art that claims that are not explicitly referenced to each other in the appended claims may be combined to present embodiments of the present disclosure, or included as new claims by subsequent amendments after the application is filed.

[0297] Industrial Applicability

[0298] The present disclosure is applicable to various wireless access systems including 3GPP systems and / or 3GPP2 systems. In addition to these wireless access systems, the embodiments of the present disclosure are also applicable to all technical fields in which wireless access systems find their applications. In addition, the proposed method can also be applied to millimeter wave (mmWave) communications using ultra-high frequency bands.

Claims

1. A method for receiving, by a base station, a physical uplink control channel (PUCCH) signal from a user equipment (UE) in a wireless communication system, the method comprising: receiving the PUCCH signal generated based on sequence information and cyclic shift information in a time slot, The sequence information is determined based on the relevant frequency hopping index and the relevant time slot information. The cyclic shift information is determined based on the relevant time slot information and the relevant symbol information; and The frequency hopping index is determined based on the frequency hopping configuration within the time slot. Wherein, if the frequency hopping is enabled, the time slot includes N hops to which frequency hopping indices are assigned from 0 to N-1, where N>1, If the frequency hopping is disabled, the frequency hopping index is equal to 0.

2. The method according to claim 1, wherein The absolute time unit for applying the sequence hopping pattern is configured differently according to the parameter set of the application.

3. The method according to claim 1, wherein The time slot includes 14 symbols.

4. The method according to claim 1, wherein The time slot corresponds to a basic scheduling unit.

5. The method according to any one of claims 1 to 4, wherein: The sequence information is determined for each hop.

6. The method according to claim 5, wherein: The sequence information identifies a basic sequence used in hopping.

7. The method according to any one of claims 1 to 4, wherein: The cyclic shift information is determined for each symbol.

8. The method according to claim 7, wherein: Each symbol corresponds to an Orthogonal Frequency Division Multiplexing (OFDM) symbol.

9. A base station, configured to receive a physical uplink control channel (PUCCH) signal from a user equipment (UE) in a wireless communication system, the base station comprising: at least one transmitter and at least one receiver; at least one processor; as well as At least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: receiving the PUCCH signal generated based on sequence information and cyclic shift information in a time slot, The sequence information is determined based on the relevant frequency hopping index and the relevant time slot information. The cyclic shift information is determined based on the relevant time slot information and the relevant symbol information; and The frequency hopping index is determined based on the frequency hopping configuration within the time slot. wherein, if frequency hopping is enabled, the time slot comprises N hops to which frequency hopping indices are assigned from 0 to N-1, where N>1, and If the frequency hopping is disabled, the frequency hopping index is equal to 0.

10. The base station according to claim 9, wherein: The absolute time unit for applying the sequence hopping pattern is configured differently according to the parameter set of the application. The base station according to claim 9 , wherein: The time slot includes 14 symbols.

12. The base station according to claim 9, wherein: The time slot corresponds to a basic scheduling unit.

13. The base station according to any one of claims 9 to 12, wherein: The sequence information is determined for each hop.

14. The base station according to claim 13, wherein: The sequence information identifies a basic sequence used in hopping.

15. The base station according to any one of claims 9 to 12, wherein: The cyclic shift information is determined for each symbol.

16. The base station according to claim 15, wherein: Each symbol corresponds to an Orthogonal Frequency Division Multiplexing (OFDM) symbol.

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