CN116491202A - Method and apparatus for unlicensed data transmission in a wireless communication system - Google Patents
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Abstract
The present disclosure relates to a communication technology and system that converges 5 th generation (5G) communication systems and internet of things (IoT) technology, the 5 th generation (5G) communication systems supporting higher data rates after the 4 th generation (4G) systems. The present disclosure may be applied to smart services (e.g., smart home, smart building, smart city, smart car or networking car, healthcare, digital education, retail, security and security related services, etc.) based on 5G communication technology and IoT related technology. A method and apparatus for performing an unlicensed communication-based and hybrid automatic repeat request acknowledgement (HARQ-ACK) information transmission thereof are provided.
Description
Technical Field
The present disclosure relates to a method of unlicensed data transmission in a wireless communication system. More particularly, the present disclosure relates to a downlink unlicensed data transmission method.
Background
In order to meet the demand for increased wireless data services since the deployment of the 4 th generation (4G) communication systems, efforts have been made to develop improved 5 th generation (5G) or quasi-5G communication systems. Thus, a 5G or quasi-5G communication system is also referred to as a "super 4G network" communication system or a "Long Term Evolution (LTE) after" system.
A 5G communication system is considered to be implemented in a higher frequency (millimeter wave) band, for example, a 60GHz band, to achieve higher data rates. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, large-scale antenna techniques are discussed in 5G communication systems.
In addition, in the 5G communication system, development of system network improvement is underway based on advanced small cells, cloud Radio Access Networks (RANs), ultra dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), reception-side interference cancellation, and the like.
In 5G systems, hybrid Frequency Shift Keying (FSK) and Quadrature Amplitude Modulation (QAM) (FQAM) and Sliding Window Superposition Coding (SWSC) have been developed as Advanced Code Modulation (ACM); and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and Sparse Code Multiple Access (SCMA) have been developed as advanced access technologies.
The internet, which is a human-centric connectivity network in which humans generate and consume information, now evolves into the internet of things (IoT) in which distributed entities such as things exchange and process information without human intervention. Internet of everything (IoE), which is a combination of IoT technology and big data processing technology through connection with cloud servers, has emerged. As IoT implementations require technical elements such as "sensing technology," "wired/wireless communication and network infrastructure," "service interface technology," and "security technology," sensor networks, machine-to-machine (M2M) communications, machine Type Communications (MTC), etc. have recently been studied. Such IoT environments may provide intelligent internet technology services that create new value for human life by collecting and analyzing data generated between connections. IoT may be applied in a variety of fields including smart homes, smart buildings, smart cities, smart cars or networked cars, smart grids, healthcare, smart appliances, and advanced medical services through fusion and combination between existing Information Technology (IT) and various industrial applications.
Accordingly, various efforts have been made to apply 5G communication systems to IoT networks. For example, techniques such as sensor networks, machine Type Communications (MTC), and machine-to-machine (M2M) communications may be implemented by beamforming, MIMO, and array antennas. The application of cloud Radio Access Networks (RANs) as the big data processing technology described above may also be considered as an example of the fusion of 5G technology with IoT technology.
The 5G communication system has been evolving to provide various services, and since various services are provided, a scheme for efficiently providing these services is required. Thus, extensive research has been conducted on unlicensed communication.
The above information is presented merely as background information to aid in the understanding of the present disclosure. No determination has been made, nor has an assertion made, as to whether any of the above can be applied as prior art to the present disclosure.
Disclosure of Invention
Technical problem
Aspects of the present disclosure are directed to solving at least the problems and/or disadvantages described above and to providing at least the advantages described below. It is, therefore, an aspect of the present disclosure to provide an embodiment for performing unlicensed data transmission/reception while efficiently using radio resources. In particular, a downlink unlicensed data transmission/reception method, an uplink unlicensed data transmission/reception method, and a method and apparatus for transmitting hybrid automatic repeat request acknowledgement (HARQ-ACK) with respect to unlicensed data transmission/reception will be described.
Solution to the problem
According to the disclosed embodiments, radio resources can be efficiently used, and various services can be efficiently provided to users according to priorities.
Additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the presented embodiments.
According to an aspect of the present disclosure, there is provided a method performed by a terminal in a communication system. The method comprises the following steps: receiving configuration information about a multicast semi-persistent scheduling (SPS) from a base station; in the case of receiving first Downlink Control Information (DCI) for activating SPS from a base station, receiving a first SPS Physical Downlink Shared Channel (PDSCH) from the base station based on the configuration information and the first DCI; identifying hybrid automatic repeat request acknowledgement (HARQ-ACK) information corresponding to the first SPS PDSCH according to the first feedback scheme; receiving a second SPS PDSCH from the base station; and identifying HARQ-ACK information corresponding to the second SPS PDSCH according to the second feedback scheme.
According to another aspect of the present disclosure, a method performed by a base station in a communication system is provided. The method comprises the following steps: transmitting configuration information about a semi-persistent scheduling (SPS) of a multicast to a terminal; transmitting first Downlink Control Information (DCI) for activating SPS to a terminal; transmitting a first SPS Physical Downlink Shared Channel (PDSCH) corresponding to the configuration information and the first DCI to the terminal; identifying whether hybrid automatic repeat request acknowledgement (HARQ-ACK) information corresponding to the first SPS PDSCH is received; and transmitting a second SPS PDSCH to the terminal in case of receiving HARQ-ACK information corresponding to the first SPS PDSCH.
Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.
Advantageous effects of the invention
According to the disclosed embodiments, radio resources can be efficiently used, and various services can be efficiently provided to users according to priorities.
Drawings
The foregoing and other aspects, features, and advantages of certain embodiments of the disclosure will become more apparent from the following description, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a diagram illustrating a transmission structure of a time-frequency domain, which is a radio resource region of a 5G or NR system, according to an embodiment of the present disclosure;
fig. 2 is a diagram illustrating an example of allocating data for emmbb, URLLC, and mctc in a time frequency resource region in a 5G or NR system according to an embodiment of the present disclosure;
fig. 3 is a diagram illustrating an unlicensed transmit/receive operation according to an embodiment of the present disclosure;
fig. 4 is a diagram illustrating a method of configuring a semi-static HARQ-ACK codebook in an NR system according to an embodiment of the present disclosure;
fig. 5 is a diagram illustrating a method of configuring a dynamic HARQ-ACK codebook in an NR system according to an embodiment of the present disclosure;
Fig. 6a is a diagram illustrating an example of a HARQ-ACK transmission procedure for DL SPS according to an embodiment of the present disclosure;
fig. 6b is a diagram illustrating another example of a HARQ-ACK transmission procedure for DL SPS according to an embodiment of the present disclosure;
fig. 6c is a diagram illustrating another example of a HARQ-ACK transmission procedure for DL SPS according to an embodiment of the present disclosure;
fig. 7 is a block diagram illustrating a process in which a UE transmits HARQ-ACK information based on a semi-static HARQ-ACK codebook for DCI indicating deactivation of an SPS PDSCH according to an embodiment of the present disclosure;
fig. 8 is a block diagram illustrating a method for a UE to determine a dynamic HARQ-ACK codebook for SPS PDSCH reception according to an embodiment of the present disclosure;
fig. 9 is a block diagram illustrating a method of transmitting HARQ-ACK information according to a DL SPS transmission period of a UE according to an embodiment of the present disclosure;
fig. 10 is a block diagram illustrating simultaneous operation of UEs dynamically changing DL SPS transmit periods according to an embodiment of the present disclosure;
fig. 11 is a diagram of a method of transmitting HARQ-ACK information for SPS release for a UE in case of activating two or more DL SPS according to an embodiment of the present disclosure;
fig. 12 is a diagram schematically illustrating an example of a signal transmission/reception scheme for a multicast service in a wireless communication system according to an embodiment of the present disclosure;
Fig. 13 is a diagram illustrating an SPS-based multicast data transmission/reception method according to an embodiment of the present disclosure;
FIG. 14 is a flowchart illustrating a method of SPS operation of a UE according to an embodiment of the present disclosure;
FIG. 15 is a flowchart illustrating a method of SPS operation of a UE according to an embodiment of the present disclosure;
fig. 16 is a diagram illustrating HARQ-ACK information reporting according to PDSCH scheduling of a specific HARQ process according to an embodiment of the present disclosure;
fig. 17 is a flowchart illustrating an operation procedure in which a base station performs scheduling in consideration of the same HARQ process according to an embodiment of the present disclosure;
fig. 18 is a block diagram illustrating a structure of a UE capable of performing in accordance with an embodiment of the present disclosure; and
fig. 19 is a block diagram illustrating a structure of a base station that can be performed according to an embodiment of the present disclosure.
Throughout the drawings, it should be noted that the same reference numerals are used to describe the same or similar elements, features and structures.
Detailed Description
The following description is provided with reference to the accompanying drawings to assist in a comprehensive understanding of the various embodiments of the disclosure defined by the claims and their equivalents. The following description includes various specific details that facilitate understanding, but are to be considered exemplary only. Accordingly, one of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
The terms and words used in the following description and claims are not limited to written meanings, but are used only by the inventors to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following descriptions of the various embodiments of the present disclosure are provided for illustration only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.
It should be understood that the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more such surfaces.
In describing embodiments of the present disclosure, descriptions related to technical contents well known in the art and not directly associated with the present disclosure will be omitted. Unnecessary description is omitted so as to prevent obscuring the main idea of the present disclosure and to more clearly communicate the main idea.
For the same reasons, some elements may be exaggerated, omitted, or schematically shown in the drawings. Furthermore, the size of each element does not fully reflect the actual size. In the drawings, identical or corresponding elements have identical reference numerals.
The advantages and features of the present disclosure, as well as the manner of attaining them, will become apparent by reference to embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments set forth below, but may be embodied in various forms. The following examples are provided solely to fully disclose the present disclosure and to inform those of ordinary skill in the art of the scope of the present disclosure and the present disclosure is limited only by the scope of the appended claims. The same or similar reference numbers will be used throughout the specification to refer to the same or similar elements.
Herein, it will be understood that each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks. These computer program instructions may also be stored in a computer-usable or computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-usable or computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operations to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.
Furthermore, each block of the flowchart illustrations may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of order. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
As used herein, "unit" refers to a software element or a hardware element, such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), that performs a predetermined function. However, the "unit" does not always have a meaning limited to only software or hardware. The "unit" may be configured to be stored in an addressable storage medium or to execute one or more processors. Thus, a "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, procedures, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a "unit" may be combined into a smaller number of elements or "units" or divided into a larger number of elements or "units". Furthermore, the elements and "units" may be implemented as one or more CPUs within a rendering device or secure multimedia card. Further, a "unit" in an embodiment may include one or more processors.
Wireless communication systems have evolved from systems providing voice-oriented services to broadband wireless communication systems providing high speed high quality packet data services such as High Speed Packet Access (HSPA), long Term Evolution (LTE) or evolved universal terrestrial radio access (E-UTRA), LTE-advanced (LTE-a), high Rate Packet Data (HRPD) of 3GPP2, ultra Mobile Broadband (UMB), and communication standards of IEEE 802.16E. In addition, the communication standard of 5G or New Radio (NR) is being formed as a 5G wireless communication system.
As a representative example of the broadband wireless communication system, the 5G or NR system employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme in Downlink (DL) and Uplink (UL). More specifically, a cyclic prefix OFDM (CP-OFDM) scheme is employed in the downlink, and a discrete fourier transform spread OFDM (DFT-S-OFDM) scheme and CP-OFDM are employed in the uplink. UL refers to a radio link through which a terminal transmits data or control signals to a base station, and DL refers to a radio link through which a base station transmits data or control signals to a terminal. The multiple access scheme as described above generally allocates and operates time-frequency resources including data or control information to be transmitted to each other to prevent the time-frequency resources from overlapping each other, i.e., to establish orthogonality, thereby dividing the data or control information of each user.
When decoding failure occurs in the initial transmission, the 5G or NR system adopts a hybrid automatic repeat request (HARQ) method for retransmitting corresponding data in the physical layer. In the HARQ scheme, when a receiver fails to correctly decode (decode) data, the receiver transmits information (negative acknowledgement, NACK) informing the transmitter of the decoding failure so that the transmitter can retransmit the corresponding data in the physical layer. The receiver combines the data retransmitted by the transmitter with previously unsuccessful data to improve data reception performance. In addition, when the receiver correctly decodes data, the receiver may transmit information (acknowledgement, ACK) informing the transmitter of the decoding success so that the transmitter may transmit new data.
On the other hand, new 5G communication New Radio (NR) access technology systems are being designed so that various services can be freely multiplexed in time and frequency resources. Thus, waveforms, numbers and reference signals may be dynamically or freely allocated according to the needs of the corresponding service. On the other hand, in 5G or NR systems, supported service types can be divided into a plurality of categories, such as enhanced mobile broadband (emmbb), mass machine type communication (emtc), and Ultra Reliable Low Latency Communication (URLLC). An emmbc is a high-speed transmission of large-capacity data, emtc is a service that minimizes terminal power and connects a plurality of terminals, and URLLC is a service that targets high reliability and low latency. Depending on the type of service applied to the terminal, different requirements may be applied.
In the present disclosure, each term is a term defined in consideration of each function, which may be changed according to intention or habit of a user or an operator. Therefore, the definition should be made based on the content of the entire specification. Hereinafter, as a subject of performing resource allocation of the terminal, the base station is at least one of a gNode B (gNB), an eNode B (eNB), a node B, BS (base station), a radio access unit, a base station controller, or a node on a network. A terminal may include a User Equipment (UE), a Mobile Station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Hereinafter, the present disclosure will be described by taking an NR system as an example, but embodiments of the present disclosure are not limited thereto, and the embodiments of the present disclosure may be applied to various communication systems having similar technical backgrounds or channel shapes. In addition, the embodiments of the present disclosure may be applied to other communication systems by making some modifications within the scope not significantly departing from the scope of the present disclosure as judged by a person having skill in the art.
In the present disclosure, the related art terms physical channel and signal may be used interchangeably with data or control signals. For example, a Physical Downlink Shared Channel (PDSCH) is a physical channel that transmits data, but in the present disclosure, the PDSCH may be referred to as data. That is, PDSCH transmission/reception may be understood as data transmission/reception.
In the present disclosure, higher layer signaling (or higher layer signaling and higher layer signaling may be mixed) is a signaling method in which a base station transmits to a terminal using a downlink data channel of a physical layer or transmits from the terminal to the base station using an uplink data channel of the physical layer, and may also be referred to as RRC signaling or MAC Control Element (CE).
As research is being conducted on a 5G communication system, various methods for scheduling communication with a terminal are being discussed. Therefore, efficient scheduling and data transmission/reception methods considering characteristics of the 5G communication system are required. Accordingly, in order to provide a plurality of services to a user in a communication system, a method and an apparatus using the same are required to provide each service within the same period of time according to characteristics of the corresponding service.
The terminal must receive separate control information from the base station in order to transmit or receive data to the base station. However, in case of periodically generated traffic or service types requiring low delay and/or high reliability, data may be transmitted or received without separate control information. Such a transmission method is referred to in this disclosure as a data transmission method based on configured grants (which may be mixed with configured grants, unlicensed or configured scheduling). The method of receiving or transmitting data after receiving the data transmission resource configuration and related information configured by the control information is referred to as a first signal transmission/reception type, and the method of transmitting or receiving data based on information configured in advance without the control information may be referred to as a second signal transmission/reception type. For the second signal transmission/reception type, a predetermined resource region periodically exists. In these areas, there may be an uplink type 1 grant (UL type 1 grant) as a method configured with only higher order signals, and an uplink type 2 grant (UL type 2 grant) (or semi-persistent scheduling, SPS) as a method configured by a combination of an upper layer signal and an L1 signal (i.e., downlink control information { DCI }). In the case of UL type 2 grant (or SPS), some signals are higher layer signals and, in addition, whether or not to transmit actual data is determined by signal L1. Here, the signal L1 may be largely divided into a signal indicating that the resources configured to be higher are activated and a signal indicating that the activated resources are released (or deactivated) again.
In the present disclosure, when the DL SPS transmission period has an aperiodic or less than one slot, methods for determining corresponding semi-static HARQ-ACK codebook and dynamic HARQ-ACK codebook and HARQ-ACK information transmission methods are included.
Fig. 1 is a diagram illustrating a transmission structure of a time-frequency domain, which is a radio resource region of a 5G or NR system, according to an embodiment of the present disclosure.
Referring to fig. 1, in a radio resource region, a horizontal axis represents a time domain and a vertical axis represents a frequency domain. The smallest transmission unit in the time domain is an OFDM symbol and aggregates N symb The OFDM symbols 102 form a slot 106. The length of the subframe may be defined as 1.0ms and the radio frame 114 may be defined as 10ms. The smallest transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth can be defined by a total of N BW Subcarriers 104. However, these specific values may be variably applied according to a 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) 515 may be defined as N in the frequency domain RB Successive subcarriers 110.
In general, the smallest transmission unit of data is an RB unit. At 5G or In NR systems, in general, N symb =14 and N RB =12, and N BW Possibly proportional to the bandwidth of the transmission band of the system. The data rate may increase in proportion to the number of RBs scheduled for the UE. In a 5G or NR system, in case of a Frequency Division Duplex (FDD) system in which DL and UL are divided by frequency to operate, DL transmission bandwidths and UL transmission bandwidths may be different from each other. The channel bandwidth represents an RF bandwidth corresponding to a system transmission bandwidth. Table 1 below shows the correspondence between the system transmission bandwidth and the channel bandwidth defined in the LTE system, which is 4 th generation wireless communication before the 5G or NR system. For example, in an LTE system having a channel bandwidth of 10MHz, the transmission bandwidth may be composed of 50 RBs.
TABLE 1
In a 5G or NR system, a channel bandwidth wider than that of LTE presented in table 1 may be employed. Table 2 shows the correspondence between the system transmission bandwidth, the channel bandwidth, and the subcarrier spacing (SCS) in the 5G or NR system.
TABLE 2
In the 5G or NR system, scheduling information of DL data or UL data is transmitted from a base station to a UE through Downlink Control Information (DCI). DCI is defined according to various formats, and may be indicated according to each format: whether DCI is scheduling information of UL data (UL grant) or scheduling information of DL data (DL grant); whether the DCI is compact DCI with control information of a smaller size; whether spatial multiplexing using a plurality of antennas is applied; whether the DCI is DCI for power control, etc. For example, DCI format 1_1, which is scheduling control information (DL grant) of DL data, may include at least one of the following control information.
-carrier indicator: indicating in which frequency carrier the corresponding information is transmitted.
-DCI format indicator: an indicator for distinguishing whether the corresponding DCI is for DL or UL.
-bandwidth part (BWP) indicator: indicating in which BWP the corresponding information is transmitted.
-frequency domain resource allocation: indicating RBs allocated for data transmission in the frequency domain. The resources to be expressed are determined according to the system bandwidth and the resource allocation method.
-time domain resource allocation: indicating that the data-related channel is to be transmitted in any symbol of any slot.
-VRB to PRB mapping: indicating how to map the virtual RB (hereinafter, VRB) index and the physical RB (hereinafter, PRB) index.
Modulation and coding scheme (hereinafter referred to as MCS): indicating the modulation scheme and coding rate used for data transmission. That is, this may indicate that a Transmission Block Size (TBS) and a coding rate value of channel coding information may be notified, as well as information on whether corresponding information quadrature phase shift monitoring (QPSK), 16 quadrature amplitude modulation (16 QAM), 64QAM, or 256 QAM.
-Code Block Group (CBG) transmit information: indicating information about which CBG is transmitted when CBG retransmission is configured.
-HARQ process number: the HARQ process number is indicated.
-a new data indicator: indicating whether the corresponding information is HARQ initial transmission or retransmission.
Redundancy version: indicating the redundancy version of HARQ.
-Physical Uplink Control Channel (PUCCH) resource indicator: PUCCH resources indicating ACK/NACK information for DL data.
PDSCH-to-HARQ feedback timing indicator: indicating a slot in which ACK/NACK information for DL data is transmitted.
Transmit Power Control (TPC) commands for PUCCH: a transmit power control command for PUCCH, which is a UL control channel, is indicated.
In the case of PUSCH transmission, the time domain resource assignment may be transmitted by information about the slot in which the PUSCH is transmitted, the starting OFDM symbol position S in the corresponding slot, and the number of OFDM symbols L to which the PUSCH is mapped. The aforementioned S may be a relative position from the beginning of the slot, L may be the number of consecutive OFDM symbols, and S and L may be determined according to a Start and Length Indicator Value (SLIV) defined as follows.
If (L-1) is 7, then
SLIV 14*(L-1)+S
Otherwise
SLIV＝14*(14-L+1)+(14-1-S)
Wherein 0< L is less than or equal to 14-S
In the 5G or NR system, in general, a table including information on a SLIV value, a PUSCH mapping type, and a slot in which a PUSCH is transmitted may be configured in one row through RRC configuration. Thereafter, in the time domain resource allocation of the DCI, the base station may transmit the SLIV value, the PUSCH mapping type, and information about the slot in which the PUSCH is transmitted to the UE by indicating the index value in the configured table. The method may also be applied to PDSCH.
Specifically, when the base station indicates to the UE the time resource allocation field index m included in the DCI for scheduling PDSCH, this informs DRMS type a location information corresponding to m+1, PDSCH mapping type information, slot index K in the table indicating time domain resource allocation information 0 A data resource start symbol S and a data resource allocation length L. As an example, table 3 below is a table including PDSCH time domain resource allocation information based on a normal cyclic prefix.
TABLE 3
In table 3, the DMRS-type a-position is a field indicating a symbol position of transmitting the DMRS in one slot indicated by a System Information Block (SIB) which is one of the UE common control information. The possible value of this field is 2 or 3. If the number of symbols constituting one slot is 14 in total and the first symbol index is 0, 2 means a third symbol and 3 means a fourth symbol. In table 3, the PDSCH mapping type is information indicating the location of the DMRS in the scheduled data resource region. When the PDSCH mapping type is a, the DMRS is always transmitted and received at a symbol position determined in the DMRS-type a-position regardless of the allocated data time domain resources. When the PDSCH mapping type is B, DMRS is always transmitted and received in the first symbol in the allocated data time domain resource. In other words, the PDSCH mapping type B does not use DMRS-typeA-position information.
In Table 1, K 0 Means an offset between a slot index to which a PDCCH through which DCI is transmitted belongs and a slot index to which a PDSCH or PUSCH scheduled in the corresponding DCI belongs. For example, when the slot index of the PDCCH is n, the slot index of the PDSCH or PUSCH scheduled by the DCI of the PDCCH is n+k 0 . In table 3, S means a start symbol index of a data time domain resource of one slot. The range of possible S values is typically 0 to 13 based on the normal cyclic prefix. In table 1, L represents a data time domain resource interval length within one slot. Possible values of L are in the range of 1 to 14.
In 5G or NR systems, PUSCH mapping types are defined as type a and type B. In PUSCH mapping type a, a first OFDM symbol of DMRS OFDM symbols is located in a second or third OFDM symbol in a slot. In PUSCH mapping type B, a first OFDM symbol of DMRS OFDM symbols is located in a first OFDM symbol of time domain resources allocated for PUSCH transmission. The PUSCH time domain resource allocation method described above may be equally applicable to PDSCH time domain resource allocation.
The DCI may be transmitted on a Physical Downlink Control Channel (PDCCH) (or control information, which may be used interchangeably hereinafter) through a channel coding and modulation procedure, which is a downlink physical control channel. In general, for each UE, DCI is scrambled independently with a specific Radio Network Temporary Identifier (RNTI) (or UE identifier), a Cyclic Redundancy Check (CRC) is added, and after channel coding, each resulting information is configured as an independent PDCCH and transmitted. The PDCCH maps to a control resource set (CORESET) configured for the UE and is transmitted.
Downlink data may be transmitted on a Physical Downlink Shared Channel (PDSCH), which is a physical channel used for downlink data transmission. The PDSCH may be transmitted after the control channel transmission part and scheduling information such as a specific mapping position and a modulation method in the frequency domain may be determined based on the DCI transmitted through the PDCCH.
In the control information constituting the DCI, the base station informs the UE of a modulation scheme applied to the PDSCH to be transmitted to the UE and a size of data to be transmitted (transport block size, { TBS }) through the MCS. In an embodiment, the MCS may be composed of 5 bits or more or less. The TBS corresponds to a data size before channel coding for error correction is applied to data (transport block { TB }) to be transmitted by the base station.
A Transport Block (TB) in the present disclosure may include a Medium Access Control (MAC) header, a MAC CE, one or more MAC Service Data Units (SDUs), and padding bits. Alternatively, the TB may represent a data unit or a MAC Protocol Data Unit (PDU) transferred from the MAC layer to the physical layer.
The modulation schemes supported by 5G or NR systems are Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64QAM, and 256QAM, and their modulation orders (Q m ) Respectively 2, 4, 6 and 8. That is, 2 bits per symbol may be transmitted for QPSK modulation, 4 bits per OFDM symbol for 16QAM modulation, 6 bits per symbol for 64QAM modulation, and 8 bits per symbol for 256QAM modulation, respectively.
When PDSCH is scheduled by DCI, HARQ-ACK information indicating whether decoding of PDSCH is successful or failed is transmitted from UE to base station through PUCCH. This HARQ-ACK information is transmitted in a slot indicated by a PDSCH-to-HARQ feedback timing indicator included in the DCI for scheduling the PDSCH. The values mapped to the 1-bit to 3-bit PDSCH-to-HARQ feedback timing indicators, respectively, are configured by higher layer signals as shown in table 4. When the PDSCH-to-HARQ feedback timing indicator indicates k, the UE transmits HARQ-ACK information after slot k in slot n where the PDSCH is transmitted (i.e., in the n+k slot).
TABLE 4
When the PDSCH-to-HARQ feedback timing indicator is not included in the DCI format 1_1 for scheduling the PDSCH, the UE transmits HARQ-ACK information in the slot n+k according to the k value configured for higher layer signaling. When transmitting HARQ-ACK information on the PUCCH, the UE transmits HARQ-ACK information to the base station using PUCCH resources determined based on a PUCCH resource indicator included in DCI for scheduling the PDSCH. In this case, the ID of the PUCCH resource mapped to the PUCCH resource indicator may be configured through higher layer signaling.
Fig. 2 is a diagram illustrating an example of allocating data for emmbb, URLLC, and mctc in a time frequency resource region in a 5G or NR system according to an embodiment of the present disclosure.
Referring to fig. 2, data for emmbb, URLLC, and mctc may be allocated throughout the system band 200. When URLLC data 203, 205, and 207 needs to be generated and transmitted when emmbb data 201 and emtc data 209 are allocated and transmitted in a specific frequency band, the transmitter may transmit URLLC data 203, 205, and 207 without transmitting or flushing a portion of the already allocated emmbb data 201 and emtc data 209. In the above service, since it is necessary to reduce the delay time of URLLC, URLLC data can be allocated and transferred to a part of resources to which the emmbc and emtc data are allocated. When URLLC data is additionally allocated and transmitted in the resource to which the eMBB data is allocated, the eMBB data may not be transmitted in the overlapping time-frequency resources, and thus the transmission performance of the eMBB data may be degraded. That is, an ebmb b data transfer failure due to the URLLC allocation may occur.
Fig. 3 is a diagram illustrating an unlicensed transmit/receive operation according to an embodiment of the present disclosure.
There are a first signal transmission/reception type in which the UE receives downlink data from the base station according to information configured only by the higher layer signal, and a second signal transmission/reception type in which the UE receives downlink data according to transmission configuration information indicated by the higher layer signal and the L1 signal. In the present disclosure, a method of operating a UE for the second signal transmission/reception type will be mainly described. In this disclosure, SPS, which is a second signal type for downlink data reception, means unlicensed PDSCH transmission in the downlink. In DL SPS, a UE may receive unlicensed PDSCH transmissions through higher layer signal configuration and additional configuration information indicated by DCI.
DL SPS means downlink semi-persistent scheduling and is a method in which a base station periodically transmits/receives downlink data information to a UE based on information configured as higher layer signaling without scheduling specific downlink control information. DL SPS may be applied in VoIP or periodically occurring traffic situations. Alternatively, the resource configuration of the DL SPS may be periodic, but the actually generated data may be aperiodic. In this case, since the UE does not know whether actual data is generated from the periodically configured resources, the following two types of operations can be performed.
-method 1: for the periodically configured DL SPS resource region, the UE transmits HARQ-ACK information of an uplink resource region corresponding to a corresponding resource region for demodulation and/or decoding (hereinafter, demodulation/decoding) result of the received data to the base station.
-method 2: for the periodically configured DL SPS resource region, when signal detection of at least DMRS or data is successfully performed, the UE transmits HARQ-ACK information of an uplink resource region corresponding to a corresponding resource region for demodulation and/or decoding results of the received data to the base station.
-method 3: for the periodically configured DL SPS resource region, upon successful decoding/demodulation (i.e., generating ACK), the UE transmits HARQ-ACK information of an uplink resource region corresponding to a corresponding resource region for demodulation and/or decoding results of the received data to the base station.
In method 1, the UE always transmits HARQ-ACK information to an uplink resource region corresponding to a DL SPS resource region even though the base station does not actually transmit downlink data of the DL SPS resource region. In method 2, since the base station does not know when to transmit data to the DL SPS resource region, HARQ-ACK information may be transmitted with the UE knowing whether to transmit/receive data, such as when DMRS detection is successful or CRC detection is successful. Method 3 transmits HARQ-ACK information to an uplink resource region corresponding to a DL SPS resource region only when the UE successfully performs data demodulation/decoding.
In the above method, the UE may always support one or two or more. One of the above methods may be selected as a 3GPP standard specification or a higher layer signal. For example, when the higher layer signal indicates method 1, the UE may be able to process HARQ-ACK information for the corresponding DL SPS based on method 1. Alternatively, one method may be selected according to DL SPS higher layer configuration information. For example, when the transmission period in the DL SPS higher layer configuration information is n slots or more, the UE may apply method 1, and in the opposite case, the UE may apply the method. In this example, a transmission period is mentioned as an example of a standard for selecting one method, but the transmission period may be entirely applied by an applied MCS table, DMRS configuration information, resource configuration information, or the like.
The UE performs downlink data reception in a downlink resource region configured for higher layer signaling. The activation or release of the downlink resource region configured by the higher layer signaling may be performed through L1 signaling.
Fig. 3 shows an operation of DL SPS. The UE configures the next DL SPS configuration information from the higher layer signal.
-periodicity: DL SPS transmission period
nrofHARQ-Processes: number of HARQ processes configured for DL SPS
N1PUCCH-AN HARQ resource information for DL SPS
-mcs-Table: MCS table configuration information for DL SPS
In the present disclosure, all DL SPS configuration information may be configured for each Pcell or Scell, and may also be configured for each band segment (bandwidth portion { BWP }). In addition, one or more DL SPS may be configured for each BWP of each specific cell.
Referring to fig. 3, the ue determines unlicensed transmit/receive configuration information 300 by receiving a higher-layer signal for DL SPS. The DL SPS may be capable of transmitting/receiving data to/from the configured resource region 308 after receiving the DCI 302 indicating activation, and may not transmit/receive data to/from the resource region 306 until receiving the DCI. In addition, the UE cannot perform data reception of the resource region 310 after receiving the DCI 304 indicating release.
For scheduling SPS activation or release, the UE validates the DL SPS assignment PDCCH when the following two conditions are met.
-condition 1: the case where the CRC bits of the DCI format transmitted in the PDCCH are scrambled with CS-RNTI configured through higher layer signaling.
-condition 2: the New Data Indicator (NDI) field of the activated transport block is configured to be 0.
When some of the fields constituting the DCI format transmitted to the DL SPS assignment PDCCH are identical to those shown in table 5 or table 6, the UE determines that the information in the DCI format is valid activation or valid release of the DL SPS. For example, when the UE detects a DCI format including information shown in table 5, the UE determines that DL SPS is activated. As another example, when the UE detects a DCI format including information shown in table 6, the UE determines that DL SPS is released.
When some of the fields constituting the DCI format transmitted to the DL SPS assignment PDCCH are different from those disclosed in table 5 (special field configuration information for activating DL SPS) or table 6 (special field configuration information for releasing DL SPS), the UE determines a CRC that the DCI format is detected as a mismatch.
TABLE 5
TABLE 6
| DCI field | DCI Format 1_0 |
| HARQ process number | All set to "0" |
| Redundancy version | Set to "00" |
| Modulation and coding scheme | All are set as '1' |
| Resource block assignment | All are set as '1' |
When the UE receives the PDSCH without receiving the PDCCH or receives the PDCCH indicating the SPS PDSCH release, the UE generates a corresponding HARQ-ACK information bit. In addition, at least in Rel-15 NR, the UE does not expect to transmit HARQ-ACK information for receiving two or more SPS PDSCH on one PUCCH resource. In other words, at least in Rel-15 NR, the UE includes only HARQ-ACK information received for one SPS PDSCH in one PUCCH resource.
DL SPS may also be configured in primary (P) cells and secondary (S) cells. The parameters that can be configured for DL SPS higher layer signaling are as follows.
-periodicity: transmission period of DL SPS
nrofHARQ-processes: number of HARQ processes that can be configured for DL SPS
N1PUCCH-AN PUCCH HARQ resources for DL SPS, base station configures the resources to PUCCH format 0 or 1.
In the case where only one DL SPS is configured for P per cell and BW, table 5 or table 6 above would be possible fields. In case of configuring a plurality of DL SPS for each cell and each BWP, a DCI field for activating (or releasing) each DL SPS resource may be changed. The present disclosure provides a method for addressing this situation.
In the present disclosure, not all DCI formats described in tables 5 and 6 are used to activate or release DL SPS resources, respectively. For example, DCI format 1_0 and DCI format 1_1 for scheduling PDSCH may be used to activate DL SPS resources. For example, DCI format 1_0 for scheduling PDSCH may be used to release DL SPS resources.
Fig. 4 is a diagram illustrating a method of configuring a semi-static HARQ-ACK codebook in an NR system according to an embodiment of the present disclosure.
Referring to fig. 4, in case that the number of HARQ-ACK PUCCHs that a UE can transmit in one slot is limited to one, when the UE receives a semi-static HARQ-ACK codebook higher layer configuration, the UE receives a PDSCH in the HARQ-ACK codebook in a slot indicated by a value of a PDSCH-to-harq_feedback timing indicator in DCI format 1_0 or DCI format 1_1 or reports HARQ-ACK information for PDSCH release. The UE reports the HARQ-ACK information bit value in the HARQ-ACK codebook as a NACK in a slot not indicated by the value of the PDSCH-to-HARQ-feedback timing indicator within DCI format 1_0 or DCI format 1_1. M when UE reports only candidate PDSCH reception in Pcell A,C When one PDSCH releases or one PDSCH receives HARQ-ACK information in each case and the report is scheduled by DCI format 1_0 including information indicating 1 in the counter DAI field, the UE determines one HARQ-ACK codebook for the corresponding SPS PDSCH release or the corresponding PDSCH reception.
Other cases follow the method of determining the HARQ-ACK codebook according to the following method.
Suppose the set of PDSCH reception candidates in serving cell c is M A,c M can be obtained by the following pseudocode 1 step A,c 。
Start pseudocode 1
-step 1: initializing j to 0 and M A,c Initialized to an empty set. K, which is a HARQ-ACK transmission timing index, is initialized to 0.
-step 2: r is configured as a set of rows in a table including slot information, start symbol information, number of symbols, or length information to which PDSCH is mapped. If the mapping symbol supporting PDSCH indicated by each R value is configured as an UL symbol according to DL and UL configurations configured in a higher layer, corresponding information is deleted from R.
-step 3-1: if the UE can receive one unicast PDSCH in one slot and R is not an empty set, set M is given to A,c And adding one.
-step 3-2: if the UE can receive one or more PDSCH for unicast in one slot, counting the number of PDSCH in the calculated R that can be assigned to different symbols and adding the counted number to M A,c 。
-step 4: restart from step 2 by incrementing k by 1.
End pseudocode 1
Taking the above pseudocode 1 as an example of fig. 4, to perform HARQ-ACK PUCCH transmission in slot #k 408, consider all slot candidates supporting PDSCH-to-HARQ-ACK timing that may indicate slot #k 408. In fig. 4, by combining PDSCH-to-HARQ-ACK timings that are possible only for PDSCH scheduled in slot #n402, slot #n+1 404, and slot #n+2 406, it is assumed that HARQ-ACK transmission may be performed in slot #k 408. In addition, the maximum number of schedulable PDSCH per slot is derived considering time domain resource configuration information of each schedulable PDSCH in slots 402, 404, and 406 and information indicating whether the symbol in the slot is downlink or uplink. For example, assuming that the maximum schedule may be two PDSCH in slot 402, three PDSCH in slot 404, and two PDSCH in slot 406, the maximum number of PDSCH included in the HARQ-ACK codebook transmitted in slot 408 is 7 in total. This is called the radix of the HARQ-ACK codebook.
In a specific slot, step 3-2 (default PDSCH time domain resource allocation a of normal CP) is described by the following table 7.
TABLE 7
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Table 7 is a time resource allocation table, and the UE operates as a default table 7 before the UE receives the time resource allocation with a separate RRC signal. For reference, the PDSCH time resource allocation value is determined by DMRS-type a-position, which is a UE common RRC signal, in addition to being an RRC indication row index value alone. In table 7, for convenience of explanation, the end column and the order column are separately added values, and they may not actually exist. The meaning of the end column means an end symbol of the scheduled PDSCH, and the sub-sequence means a code position value located in a specific codebook in the semi-static HARQ-ACK codebook. Table 7 is applied to time resource allocation applied in DCI format 1_0 of the common search region of the PDCCH.
In order for the UE to determine the HARQ-ACK codebook by calculating the maximum number of non-overlapping PDSCH within a particular slot, the UE performs the following steps:
* Step 1: PDSCH allocation values ending first in a slot are retrieved in all rows of the PDSCH time resource allocation table. In table 7, it can be seen that the row index 14 ends first. The row index 14 is marked as "1" in the sequence column. The other row index overlapping the corresponding row index 14 by at least one symbol is indicated as "1x" in the order column.
* Step 2: the PDSCH allocation value that ends first is retrieved from the remaining row index not shown in the sequence columns. In table 7, a row having a row index of 7 and a DMRS-typeA-position value of 3 corresponds to the retrieved value. The other row index overlapping the corresponding row index by at least one symbol is indicated as "2x" in the order column.
* Step 3: step 2 is repeated and the sequence value is incremented and displayed. As an example, the PDSCH allocation value that ended first is retrieved in a row index that is not indicated in the order column in table 7. In table 7, a row having a row index of 6 and a DMRS-type a-position value of 3 corresponds thereto. Other row indices that overlap the corresponding row index by at least one symbol are indicated as "3x" in the order column.
* Step 4: when the order is displayed in all the line indexes, the corresponding steps are ended. The size of the corresponding order is the maximum number of PDSCH that can be scheduled in the corresponding slot without time overlap. Scheduling without time overlap means that different PDSCH is scheduled by TDM.
In the sub-sequence of table 7, the maximum order value means the HARQ-ACK codebook size of the corresponding slot, and the order value means the HARQ-ACK codebook point where the HARQ-ACK feedback bit of the corresponding scheduled PDSCH is located. For example, the row index 16 of table 7 means that it exists at the second code position in the semi-static HARQ-ACK codebook of size 3. When it is assumed that the actual set of candidates for PDSCH reception in the serving cell is M A,c At this time, as pseudocode 1 or pseudocode 2 step, the UE transmitting HARQ-ACK feedback may obtain M A,c 。M A,c May be used to determine the number of HARQ-ACK bits to be transmitted by the UE. In particular, M can be used A,c The cardinality of the set configures the HARQ-ACK codebook.
As another example, consideration for determining a semi-static HARQ-ACK codebook (or type 1HARQ-ACK codebook) may be as follows.
a) Set K of slot timing values associated with active UL BWP 1
a) If the UE is configured to monitor PDCCH to obtain DCI format 1_0 and is not configured to monitor PDCCH to obtain DCI format 1_1 on serving cell c, K 1 Is provided by slot timing values {1,2,3,4,5,6,7,8} for DCI format 1_0
b) If the UE is configured to monitor the PDCCH for serving cell c to obtain DCI format 1_1, K 1 Provided by dl-DataToUL-ACK for DCI format 1_1
b) If provided by PDSCH-TimeDomainResourceAllocationList in PDSCH-Config; associated with active DL BWP and defining a slot offset K 0 Corresponding group of start and length indicators SLIV and PDSCH mapping type of PDSCH reception (as in [6.ts 38.214)]Description of the above), then about time domain resource allocation by PDSCH-timedomainresource allocation list or default PDSCH in PDSCH-ConfigCommon a [6, ts 38.214 ]A first set of row indices of a table provided or a set of row indices of a table provided by a combination of a first set of row indices and a second set of row indices
c) With respect to activity separatelyDownlink SCS configuration μ provided by subsearrier spacing in BWP-Downlink and BWP-Uplink for DL BWP and active UL BWP DL Configuration mu with uplink SCS UL Ratio between
d) If provided, then with respect to TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedimated, as described in sub-clause 11.1.
As another example, the pseudo code for determining the HARQ-ACK codebook may be as follows.
Start pseudocode 2
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End pseudocode 2
In pseudo code 2, the position of the HARQ-ACK codebook including HARQ-ACK information for DCI indicating DL SPS release is based on the position where DL SPS PDSCH is received. For example, when a start symbol in which the transmission DL SPS PDSCH starts from the 4 th OFDM symbol based on the slot and has a length of 5 symbols, a position including HARQ-ACK information indicating DL SPS release corresponding to the release of SPS is determined as follows. Assuming that a start symbol starts from the 4 th OFDM symbol of a slot in which DL SPS transmission is transmitted and maps PDSCH of 5 symbols in length, the location of the corresponding HARQ-ACK information is determined by a PDSCH-to-HARQ-ACK timing indicator and PUCCH resource indicator included in control information indicating DL SPS release. As another example, when a start symbol in which the transmission DL SPS PDSCH starts from the 4 th OFDM symbol based on the slot and has a length of 5 symbols, a position including HARQ-ACK information indicating DL SPS release corresponding to release of SPS is determined as follows. Assuming that PDSCH of 5 symbols in length is mapped from the 4 th OFDM symbol of a slot indicated by Time Domain Resource Allocation (TDRA) of DCI, which is DL SPS release, the location of corresponding HARQ-ACK information is determined by PDSCH-to-HARQ-ACK timing indicator and PUCCH resource indicator included in control information indicating DL SPS release.
Fig. 5 is a diagram illustrating a method of configuring a dynamic HARQ-ACK codebook in an NR system according to an embodiment of the present disclosure.
PDSCH-to-harq_feedback timing value based on PUCCH transmission of HARQ-ACK information in slot n for PDSCH reception or SPS PDSCH release and transmission slot position information K of PDSCH scheduled in DCI format 1_0 or 1_1 0 The UE transmits HARQ-ACK information transmitted in one PUCCH in the corresponding slot n. Specifically, for transmitting the above HARQ-ACK information, the UE determines the timing and K at the time of feedback by PDSCH-to-harq_based on DAI included in DCI indicating PDSCH or SPS PDSCH release 0 HARQ-ACK codebook of PUCCH transmitted in indicated slot.
The DAI consists of a counter DAI and a total DAI. The counter DAI is information indicating a position of HARQ-ACK information corresponding to the PDSCH scheduled in the DCI format 1_0 or the DCI format 1_1 in the HARQ-ACK codebook. Specifically, the value of the counter DAI in DCI format 1_0 or 1_1 informs of the accumulated value of PDSCH reception or SPS PDSCH release scheduled by DCI format 1_0 or DCI format 1_1 in a specific cell c. The above accumulated value is configured based on PDCCH monitoring occasions and serving cells in which the scheduled DCI exists.
The total DAI is a value indicating the size of the HARQ-ACK codebook. Specifically, the value of the total DAI means the total number of previously scheduled PDSCH or SPS PDSCH releases including the point of time at which DCI is scheduled. The total DAI is a parameter used when HARQ-ACK information in the serving cell c further includes HARQ-ACK information of a PDSCH scheduled in another cell including the serving cell c in the case of Carrier Aggregation (CA). In other words, there is no total DAI parameter in a system operating with one cell.
An example of the operation of the DAI is shown in fig. 5.
Referring to fig. 5, when the UE transmits the HARQ-ACK codebook selected based on the DAI to the PUCCH 520 in the nth slot of carrier 0 (502) in the case where two carriers are configured, a change in the values of the counter DAI (C-DAI) and the total DAI (T-DAI) indicated by DCI retrieved for each PDCCH monitoring occasion configured for each carrier is shown. First, in DCI retrieved at m=0 (506), C-DAI and T-DAI indicate values (512) 1, respectively. DCI retrieved at m=1 (508) indicates a value (514) in which C-DAI and T-DAI are 2, respectively. In DCI retrieved in carrier 0 (c=0, 502) of m=2 (510), C-DAI indicates value (516) 3. In DCI retrieved in carrier 1 (c=1, 504) of m=2 (510), C-DAI indicates value (518) 4. At this time, when carriers 0 and 1 are scheduled at the same monitoring occasion, the T-DAI is all indicated as 4.
In fig. 4 and 5, HARQ-ACK codebook determination is performed in a case where only one PUCCH containing HARQ-ACK information is transmitted in one slot. This is referred to as mode 1. As an example of a method of determining one PUCCH transmission resource within one slot, when PDSCH scheduled in different DCI is multiplexed into one HARQ-ACK codebook in the same slot and transmitted, PUCCH resources selected for HARQ-ACK transmission are determined as PUCCH resources indicated by a PUCCH resource indicator field indicated in DCI of the final scheduled PDSCH. That is, PUCCH resources indicated by a PUCCH resource indicator field indicated in DCI scheduled before DCI are ignored.
The following description defines methods and apparatuses for determining a HARQ-ACK codebook in the case where two or more PUCCHs containing HARQ-ACK information can be transmitted in one slot. This is referred to as mode 2. The UE may be able to operate in only mode 1 (only one HARQ-ACK PUCCH is transmitted in one slot) or mode 2 (one or more HARQ-ACK PUCCHs are transmitted in one slot). Alternatively, the UE supporting both mode 1 and mode 2 configures the base station to operate in only one mode through higher layer signaling, or implicitly determines mode 1 and mode 2 by DCI format, RNTI, DCI specific field values, scrambling, etc. For example, PDSCH scheduled in DCI format a and HARQ-ACK information associated therewith are based on mode 1 and PDSCH scheduled in DCI format B and HARQ-ACK information associated therewith are based on mode 2.
Whether the HARQ-ACK codebook described above is semi-static in fig. 4 or dynamic in fig. 5 is determined by the RRC signal.
Fig. 6A is a diagram illustrating an example of a HARQ-ACK transmission procedure for DL SPS according to an embodiment of the present disclosure.
Referring to fig. 6A, reference numeral 600 shows a case in which maximum receivable PDSCHs 602, 604, and 606 are mapped in slot k without overlapping from the point of view of time resources. For example, if a PDSCH-to-HARQ feedback timing indicator is not included in the DCI format for scheduling the PDSCH, the UE transmits HARQ-ACK information 608 in slot k+1 according to a value 1 obtained by configuring HARQ-ACK information via a higher layer signal. Thus, the size of the semi-static HARQ-ACK codebook for slot k+1 is equal to the maximum number of transmittable PDSCH in slot k, and will be 3. In addition, when the HARQ-ACK information is 1 bit for each PDSCH, the HARQ-ACK codebook 600 to 608 of fig. 6A will be composed of a total of 3 bits [ X, Y, Z ], X may be HARQ-ACK information about the PDSCH 602, Y may be HARQ-ACK information about the PDSCH 604, and Z may be HARQ-ACK information about the PDSCH 606. If the PDSCH reception is successful, the corresponding information will be mapped to an ACK, otherwise it will be mapped to a NACK. In addition, when the actual DCI does not schedule the corresponding PDSCH, the UE reports NACK. Specifically, the position of the HARQ-ACK codebook according to the SLIV positioning of the PDSCH that can be scheduled in the DCI (hereinafter, which may be understood as the position of the HARQ-ACK bit on the HARQ-ACK codebook) may be changed, and the position of the HARQ-ACK codebook may be determined by table 7 or pseudocode 1 or pseudocode 2.
Reference numeral 610 of fig. 6A shows HARQ-ACK transmission in the case where DL SPS is activated. In Rel-15 NR, the minimum period of DL SPS is 10ms, and in 610, since the length of one slot is 1ms in a subcarrier interval of 15kHz, SPS PDSCH 612 is transmitted in slot n, and then SPS PDSCH 616 is transmitted in slot n+10.
According to information included in the DCI format indicating the corresponding SPS activation, HARQ-ACK information for each SPS PDSCH is a higher layer signal, indicates a period of SPS, HARQ-ACK transmission resource information, MCS table configuration, and the number of HARQ processes, and then indicates frequency resources, time resources, MCS values, and the like. For reference, a PUCCH resource through which HARQ-ACK information is transmitted may also be configured as a higher layer signal, and the PUCCH resource has the following characteristics.
Whether to perform frequency hopping
PUCCH format (start symbol, symbol length, etc.)
Here, MCS table configuration and HARQ-ACK transmission resource information may not exist. Rel-15 NR supports PUCCH format 0 or 1, which may be transmitted up to 2 bits, when there is HARQ-ACK transmission resource information. However, in the subsequent release, PUCCH formats 2, 3, or 4 of 2 bits or more may be sufficiently supported.
Since HARQ-ACK transmission resource information is included in the DL SPS higher layer signal configuration, the UE may be able to ignore a PUCCH resource indicator in a DCI format indicating DL SPS activation. Alternatively, the PUCCH resource indicator field itself may not be present in the corresponding DCI format. On the other hand, when there is no HARQ-ACK transmission resource information in the DL SPS higher layer signal configuration, the UE transmits HARQ-ACK information corresponding to the DL SPS in the PUCCH resource determined in the PUCCH resource indicator for activating the DCI format of the DL SPS. In addition, a difference between a slot in which the SPS PDSCH is transmitted and a slot in which corresponding HARQ-ACK information is transmitted is determined by a value indicated by a PDSCH-to-HARQ-ACK feedback timing indicator for a format of DCI for activating DL SPS. Alternatively, when no indicator is present, the difference between them follows a specific value that is configured in advance as a higher layer signal. For example, as in reference numeral 610 of fig. 6A, when the PDSCH-to-HARQ-ACK feedback timing indicator is 2, HARQ-ACK information of the SPS PDSCH 612 transmitted in slot n is transmitted in slot n+2 through the PUCCH 614. In addition, the PUCCH through which the corresponding HARQ-ACK information is transmitted may be configured as a higher layer signal, or the corresponding resource may be determined by the signal L1 indicating DL SPS activation. When it is assumed that a maximum of three PDSCHs can be received as 600 in fig. 6A and that the time resource of the PDSCH 612 is the same as the PDSCH 604, the position of the HARQ-ACK codebook of the SPS PDSCH 612 transmitted to the PUCCH 614 is located at Y in [ X Y Z ].
When transmitting DCI indicating DL SPS release, the UE needs to transmit HARQ-ACK information of the DCI to the base station. However, in the case of the semi-static HARQ-ACK codebook, as described above in the present disclosure, the size of the HARQ-ACK codebook and its position are determined by the time resource region to which the PDSCH is allocated and the slot interval (PDSCH to HARQ-ACK feedback timing) between the PDSCH and the HARQ-ACK indicated by the signal L1 or the higher layer signal. Thus, when HARQ-ACKs of DCI indicating DL SPS release are transmitted using a semi-static HARQ-ACK codebook, a specific rule is required instead of arbitrarily determining the position in the HARQ-ACK codebook, and in Rel-15 NR, the position of HARQ-ACK information of DCI indicating DL SPS release is equally mapped to a transmission resource region corresponding to DL SPS PDSCH.
As an example, reference numeral 620 of fig. 6A shows a case where DCI 622 indicating release of activated DL SPS PDSCH is transmitted in slot n. When the PDSCH-to-HARQ-ACK feedback timing indicator of the corresponding format DCI 622 indicates 2, HARQ-ACK information of the corresponding DCI 622 may be transmitted to PUCCH 623 of slot n+2. Here, as if a predetermined SPS PDSCH is scheduled in the slot n, the UE transmits HARQ-ACK information of DCI 622 indicating DL SPS release at a position corresponding to the HARQ-ACK codebook of the hypothesized SPS PDSCH. In this regard, the following two methods are possible, and the base station and the UE may transmit and receive corresponding DCI in at least one method according to a standard or a base station standard.
* Method 1-1-1: transmitting DCI indicating DL SPS release only in a slot where a predetermined SPS PDSCH is to be transmitted
For example, as shown in reference numeral 620 of fig. 6A, when the SPS PDSCH is configured to be transmitted in slot n, the UE transmits DCI 622 indicating release of the SPS PDSCH only in slot n, and when it is assumed that the SPS PDSCH is transmitted, the slots in which HARQ-ACK information is transmitted have the same determined slot position. In other words, when the slot in which the HARQ-ACK information of the SPS PDSCH is transmitted is n+2, the slot in which the HARQ-ACK information of the DCI indicating the release of DL SPS PDSCH is transmitted is also n+2.
* Methods 1-1-2: the DCI indicating the DL SPS release is transmitted in any slot regardless of the slot in which the SPS PDSCH is transmitted.
For example, as in reference numeral 620 of fig. 6A, assuming that SPS PDSCH is transmitted in slots n, n+10, n+20, … …, the base station transmits DCI 624 indicating release of the corresponding DL SPS PDSCH in slot n+3. Here, when the value indicated in the PDSCH-to-HARQ-ACK feedback timing indicator included in the corresponding DCI is 1 or there is no corresponding field, or when the value previously configured as a higher layer signal is 1, HARQ-ACK information 626 of DCI released by the indication DL SPS PDSCH is transmitted/received in the slot n+4.
In addition, there may be a case where the minimum period of DL SPS is shorter than 10 ms. For example, when there is data requiring high reliability and low latency wirelessly by different devices in the factory and the transmission period of the data is constant and the period itself is short, the transmission period should be shorter than the current minimum period of 10 ms. Thus, the DL SPS transmit period may be determined in units of slots, symbols, or groups of symbols other than ms, regardless of the subcarrier spacing.
For reference, the minimum transmission period of the grant PUSCH resource of the uplink configuration is 2 symbols.
Fig. 6B is a diagram illustrating another example of a HARQ-ACK transmission procedure for DL SPS according to an embodiment of the present disclosure.
Referring to fig. 6B, reference numeral 630 of fig. 6B shows a case where a transmission period of the DL SPS is 7 symbols smaller than a corresponding slot. Since the transmission period is within one slot, a minimum of two SPS PDSCH 632 and 634 may be transmitted in slot k. When there is no value or corresponding field indicated by the PDSCH-to-HARQ-ACK feedback timing indicator included in the DCI indicating SPS activation, HARQ-ACK information corresponding to SPS PDSCH 632 and SPS PDSCH 634 is transmitted in a slot according to a value previously configured as a higher layer signal. For example, when the corresponding value is i, the UE transmits HARQ-ACK information 636 for SPS PDSCH 632 and SPS PDSCH 634 in slot k+i.
The location of the HARQ-ACK information on the HARQ-ACK codebook should be obtained by considering the transmission period and TDRA, which is time resource information for which the SPS PDSCH is scheduled. In the related art, since only one SPS PDSCH can be transmitted per slot, the position of the HARQ-ACK codebook is determined based on the TDRA as time resource information without considering a transmission period. However, when the DL SPS transmission period is smaller than the slot, the TDRA as time resource information and the transmission period should be considered together in order to determine the position of the HARQ-ACK codebook. Here, the TDRA is a time domain resource allocation, and includes a transmission start symbol and length information of the SPS PDSCH. For example, when the DL SPS transmit period is 7 symbols, the start symbol of DL SPS PDSCH determined by the TDRA is 2, and the length is 3, two DL SPS PDSCH may exist in one slot, as reference numeral 630 of fig. 6B. That is, the first SPS PDSCH 632 is a PDSCH with OFDM symbol indices 2, 3, and 4 determined in the TDRA, and the second SPS PDSCH 634 is a PDSCH with OFDM symbol indices 9, 10, and 11 in consideration of the TDRA and the transmission period of 7 symbols. That is, the second SPS PDSCH in the slot has the same length as the first SPS PDSCH but with the offset shifted by the transmission period. In summary, to determine the position of the HARQ-ACK codebook of the SPS PDSCH in one slot, the UE uses the time resource allocation information to generate and determine a quasi-static HARQ-ACK codebook when the SPS PDSCH transmission period is greater than one slot, or considers the time resource allocation information and the SPS PDSCH transmission period together when the SPS PDSCH transmission period is less than one slot.
When the SPS PDSCH transmission period is less than one slot, a case where the SPS PDSCH extends the slot boundary may occur according to a combination of the transmission period and the TDRA. Fig. 6C is a diagram illustrating another example of a HARQ-ACK transmission procedure for DL SPS according to an embodiment of the present disclosure.
Referring to fig. 6C, reference numeral 650 of fig. 6C shows a corresponding example. In this case, the base station is configured in such a manner that one SPS PDSCH outside the slot boundary is divided into PDSCH 652 and PDSCH 654 for repeated transmission. In this case, PDSCH 652 and PDSCH 654 may always have the same length or different lengths. In addition, the UE transmits only one HARQ-ACK information 656 for the SPS PDSCH consisting of PDSCH 652 and PDSCH 654, and the corresponding reference slot is based on slot k+1 where the last repeatedly transmitted PDSCH 654 has been transmitted.
Example 1-1: method of mapping semi-static HARQ-ACK codebook for DCI indicating DL SPS release
In case that the transmission period of the SPS PDSCH becomes smaller than one slot, when the UE transmits HARQ-ACK information for requesting DCI for release of the corresponding SPS PDSCH based on the semi-persistent HARQ-ACK codebook, the UE maps the HARQ-ACK codebook of the corresponding DCI by at least one of the following methods.
* Method 1-2-1: the position on the semi-persistent HARQ-ACK codebook of the HARQ-ACK information of the DCI indicating the release of the SPS PDSCH is the same as the position on the HARQ-ACK codebook of the first SPS PDSCH from the time resource perspective among the SPS PDSCH received in one slot.
-when the number of SPS PDSCH in a slot of a DCI indicating release of SPS PDSCH is two or more, the UE maps HARQ-ACK information of the corresponding DCI to a position of a semi-static HARQ-ACK codebook of HARQ-ACK information of the SPS PDSCH first in time and transmits the resulting information.
For example, SPS PDSCH is included in a slot in which DCI indicating release of SPS PDSCH is to be transmitted, when the maximum number of PDSCH that can be transmitted and received without simultaneous PDSCH reception is 4, the HARQ-ACK codebook size of the corresponding slot is 4, and HARQ-ACK information for SPS PDSCH or PDSCH reception may be mapped to each location {1,2,3,4}. When it is assumed that two SPS PDSCH exist at positions {2} and {3} respectively, the released HARQ-ACK information of the indication DL SPS PDSCH is mapped to a position {2} among positions in the HARQ-ACK codebook of HARQ-ACK information corresponding to positions {2} and {3 }.
* Method 1-2-2: the position of the semi-persistent HARQ-ACK codebook of the HARQ-ACK information of the DCI indicating the release of the SPS PDSCH is the same as the position of the HARQ-ACK codebook of the SPS PDSCH located last in terms of time resources among the SPS PDSCH received in one slot.
-when the number of SPS PDSCH in a slot of a DCI indicating release of SPS PDSCH is two or more, the UE maps HARQ-ACK information of the corresponding DCI to a position of a semi-static HARQ-ACK codebook of HARQ-ACK information of the last SPS PDSCH in time and transmits the resulting information.
For example, when the maximum number of PDSCHs that can be transmitted and received without simultaneous PDSCH reception is 4 while SPS PDSCH is included in a slot in which DCI indicating release of SPS PDSCH is to be transmitted, the size of HARQ-ACK codebook of the corresponding slot is 4, and HARQ-ACK information for SPS PDSCH or PDSCH reception may be mapped to each location {1,2,3,4}. When it is assumed that two SPS PDSCH exist at positions {2} and {3} respectively, the released HARQ-ACK information of the indication DL SPS PDSCH is mapped to a position {3} among positions in the HARQ-ACK codebook of HARQ-ACK information corresponding to positions {2} and {3}.
* Methods 1-2-3: the position of the semi-persistent HARQ-ACK codebook of HARQ-ACK information of DCI indicating release of the SPS PDSCH is the same as the position of all HARQ-ACK codebooks of the SPS PDSCH received in one slot.
-when the number of SPS PDSCH in a slot of DCI indicating release of SPS PDSCH is two or more, the UE repeatedly maps HARQ-ACK information of the corresponding DCI to positions of semi-static HARQ-ACK codebooks of HARQ-ACK information of all SPS PDSCH and transmits the resulting information.
For example, when the maximum number of PDSCHs that can be transmitted and received without simultaneous PDSCH reception is 4 while SPS PDSCH is included in a slot in which DCI indicating release of SPS PDSCH is to be transmitted, the size of HARQ-ACK codebook of the corresponding slot is 4, and HARQ-ACK information for SPS PDSCH or PDSCH reception may be mapped to each location {1,2,3,4}. When it is assumed that two SPS PDSCH exist at positions {2} and {3} respectively, the released HARQ-ACK information indicating DL SPS PDSCH is repeatedly mapped to positions {2} and {3}. That is, the same HARQ-ACK information is mapped to positions {2} and {3}.
* Methods 1-2-4: the location of the semi-persistent HARQ-ACK codebook of HARQ-ACK information of DCI indicating release of the SPS PDSCH is selected as one of a plurality of HARQ-ACK codebook candidate locations of the SPS PDSCH received in one slot based on a higher layer signal configured by a base station, a signal L1, or a combination thereof.
-when the number of SPS PDSCHs in a slot of a DCI indicating release of SPS PDSCH is two or more, the base station selects one of positions of a semi-persistent HARQ-ACK codebook of HARQ-ACK information of SPS PDSCH based on a higher layer signal, signal L1, or a combination thereof, and the UE maps HARQ-ACK information of the corresponding DCI to the selected position and transmits the resulting information.
For example, when the maximum number of PDSCHs that can be transmitted and received without simultaneous PDSCH reception is 4 while SPS PDSCH is included in a slot in which DCI indicating release of SPS PDSCH is to be transmitted, the size of HARQ-ACK codebook of the corresponding slot is 4, and HARQ-ACK information for SPS PDSCH or PDSCH reception may be mapped to each location {1,2,3,4}. When it is assumed that two SPS PDSCH exist at positions {2} and {3} respectively, the base station selects {2} by using the released DCI indicating DL SPS PDSCH, and the UE maps the released HARQ-ACK information indicating DL SPS PDSCH to position {2} and transmits the resulting information. As a DCI field for determining the location of the semi-static HARQ-ACK codebook, a time resource allocation field, a HARQ process number, or a PDSCH-to-HARQ feedback timing indicator may be utilized. For example, a time resource allocation field in DCI indicating release of SPS PDSCH indicates time resource information of one of SPS PDSCH that may be transmitted in a corresponding slot, and UE may transmit HARQ-ACK information of the corresponding DCI to a location corresponding to the indicated semi-persistent HARQ-ACK codebook of SPS PDSCH.
* Methods 1-2-5: the location of the semi-static HARQ-ACK codebook of HARQ-ACK information of DCI indicating release of SPS PDSCH is indicated or configured by the base station through a higher layer signal, signal L1, or a combination thereof. When the maximum number of receivable PDSCHs, which are not time-overlapped, in a slot of DCI indicating release of the SPS PDSCH is two or more, the base station selects one of positions of a semi-static HARQ-ACK codebook of HARQ-ACK information of the corresponding PDSCH according to a higher layer signal, a signal L1, or a combination thereof, and the UE maps the HARQ-ACK information of the corresponding DCI to the selected position and transmits the resultant information.
The set of semi-persistent HARQ-ACK codebook positions that can be selected by the base station through methods 1-2-4 consists of semi-persistent HARQ-ACK codebook positions to which HARQ-ACK information of the SPS PDSCH can be mapped, and the set of semi-persistent HARQ-ACK codebook positions that can be selected by the base station through methods 1-2-5 consists of semi-persistent HARQ-ACK codebook positions to which HARQ-ACK information of all PDSCH can be mapped. For example, when the maximum number of PDSCHs that can be transmitted and received without simultaneous PDSCH reception is 4 while SPS PDSCH is included in a slot in which DCI indicating release of SPS PDSCH is to be transmitted, it is assumed that two SPS PDSCHs exist at positions {2} and {3} respectively, candidate positions in which HARQ-ACKs of DCI indicating SPS PDSCH release can be transmitted are {2} according to methods 1-2-4, {3} and {1} according to methods 1-2-5, {2}, {3}, {4}.
For example, when the maximum number of PDSCHs that can be transmitted and received without simultaneous PDSCH reception is 4 while including SPS PDSCH in a slot in which DCI indicating release of SPS PDSCH is to be transmitted, the HARQ-ACK codebook size of the corresponding slot is 4, and HARQ-ACK information for SPS PDSCH or PDSCH reception may be mapped to each location {1,2,3,4}. The base station selects {1} using the released DCI indicating DL SPS PDSCH, and the UE maps the released HARQ-ACK information indicating DL SPS PDSCH to location {1} and transmits the resulting information. As a DCI field for determining the semi-static HARQ-ACK codebook location, a time resource allocation field, a HARQ process number, or a PDSCH-to-HARQ feedback timing indicator may be utilized. For example, a time resource allocation field in DCI indicating release of SPS PDSCH indicates time resource information of one PDSCH among PDSCH that can be transmitted in a corresponding slot, and UE transmits HARQ-ACK information of the corresponding DCI to a semi-static HARQ-ACK codebook location corresponding to the indicated PDSCH.
The above method will be possible in case only one HARQ-ACK transmission is supported in one slot. When configuring Code Block Group (CBG) -based transmission to a higher layer through DL SPS PDSCH, the UE may repeat HARQ-ACK information of the released DCI indicating DL SPS PDSCH through the number of CBGs, may map the repeated HARQ-ACK information to semi-static HARQ-ACK codebook resources determined through at least one of the above methods, and may transmit the resulting information. Although the above method has been described as a method of transmitting HARQ-ACK information of DL SPS PDSCH indicating release of one SPS PDSCH transmission/reception, the above method may be applied to a method of transmitting HARQ-ACK information of DL SPS PDSCH indicating simultaneous release of two or more activated PDSCH transmissions/receptions in one cell or/and one BWP. As an example, when DCI indicating release of one DL SPS PDSCH is related to SPS PDSCH activated in one cell or/and one BWP, SPS PDSCH considered for HARQ-ACK codebook positioning may belong to one SPS configuration or may be SPS PDSCH belonging to all configurations. At this time, when the SPS PDSCH under consideration belongs to one SPS configuration, one SPS configuration may be the SPS configuration having the lowest SPS PDSCH configuration number (or SPS index or SPS configuration identifier) or the SPS configuration that was activated first. This is merely an example and other similar methods may be sufficiently possible.
Examples 1-2: dynamic HARQ-ACK codebook mapping method for multiple SPS PDSCH transmitted in one slot
In the dynamic HARQ-ACK codebook (or type 2HARQ-ACK codebook), the location of the corresponding HARQ-ACK information is basically determined by the total DAI and the counter DAI included in the DCI for scheduling the PDSCH. The total DAI informs of the size of the HARQ-ACK codebook transmitted in the slot n, and the counter DAI informs of the position of the HARQ-ACK codebook transmitted in the slot n. Next, the dynamic HARQ-ACK codebook in Rel-15 NR is configured by pseudo code 3.
Start pseudocode 3
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End pseudocode 3
When the transmission period of the SPS PDSCH is greater than one slot, the pseudo code 3 is applied, and when the transmission period of the SPS PDSCH is less than one slot, the dynamic HARQ-ACK codebook is determined by the following pseudo code 4. Alternatively, the pseudo code 4 may be generally applied regardless of the SPS PDSCH transmission period or the number of SPS PDSCH activated in one cell or/and one BWP (or one cell/one BWP).
Start pseudocode 4
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End pseudocode 4
In the above pseudo code 4, the value k as the number of SPS PDSCH in one slot corresponds to only one SPS PDSCH configuration in one cell/one BWP, or when a plurality of SPS PDSCH configurations can be configured within one cell or/and one BWP, all SPS PDSCH configurations may be included.
Pseudocode 3 or pseudocode 4 may be applied when HARQ-ACK information transmission is limited to at most one per slot.
Examples 1-3: method for transmitting single HARQ-ACK codebook of multiple SPS PDSCH transmitted in one time slot
When the UE receives a configuration of a DL SPS transmission period of less than one slot from the base station according to a higher layer signal to transmit only one HARQ-ACK per slot, the UE transmits HARQ-ACK information about DL SPS PDSCH and DL SPS PDSCH 634 as received in slot k in 630 of fig. 6B to PUCCH of slot k+i indicated in advance by the higher layer signal, signal L1, or a combination thereof. For example, the UE determines granularity of PDSCH-to-HARQ-ACK feedback timing indicator in DCI format indicating DL SPS activation to be determined as a slot level, the base station provides the UE with a difference between a slot index of reception DL SPS PDSCH and a slot index of transmission HARQ-ACK information, and PUCCH resources through which the HARQ-ACK information is transmitted in a slot indicated by L1 are configured to the UE according to a higher layer signal. Reference numeral 630 of fig. 6B shows a case of PDSCH to HARQ-ACK feedback timing indicator indication value i. The corresponding value may be selected directly from the signal SL, or the candidate value may be configured from a higher layer signal, and one of these values may be selected from the signal L1.
When the UE or the base station wants to separately transmit and receive the HARQ-ACK information of DL SPS PDSCH independently transmitted and received, the base station may transmit two or more HARQ-ACKs per slot according to a higher layer signal configuration in a DL SPS transmission period of less than one slot. For example, as in 660 of fig. 6C, the UE transmits HARQ-ACK information of SPS PDSCH 662 received in slot k through PUCCH 666 in slot k+i, and HARQ-ACK information of SPS PDSCH 664 may be transmitted through PUCCH 668 in slot k+i. For this, as an example, the UE determines granularity of PDSCH-to-HARQ-ACK feedback timing indicators in a DCI format indicating DL SPS activation as a symbol level, and the corresponding value may mean a total symbol length from a transmission end symbol (or transmission start symbol) of the SPS PDSCH to a transmission start symbol (or transmission end symbol) of a PUCCH in which corresponding HARQ-ACK information is transmitted.
In 660 of fig. 6C, when the end symbol of the SPS PDSCH 662 is s0 and the start symbol of the PUCCH 666 through which the HARQ-ACK information of the SPS PDSCH 662 is transmitted is s1, the value indicated by the PDSCH-to-HARQ-ACK timing indicator may be "s1-s0", and this value is directly selected by the signal L1 or the candidate value is configured according to the higher layer signal. Here, one of these values is configured according to the signal L1. From this information, the UE can determine a starting symbol of PUCCH to which HARQ-ACK information of the SPS PDSCH is to be transmitted.
Other PUCCH transmission information may be determined according to a higher layer signal, signal L1, or a combination thereof. When using the PUCCH resource indicator in the L1 or higher layer signal of Rel-15, the UE may determine not to use the "start symbol index" field among the values indicated by the corresponding indicators. Alternatively, since the start symbol of transmitting the HARQ-ACK information has been provided through the PDSCH-to-HARQ-ACK feedback timing indicator information, a signal composed of a new higher layer signal without a corresponding field, a signal L1, or a combination thereof may be provided to the UE. In summary, the UE may interpret PDSCH-to-HARQ-ACK feedback timing indicator fields included in DCI indicating activation of SPS PDSCH differently according to SPS PDSCH transmission period as follows.
-method 1-3-1: determination by slot level
For example, when the transmission period of the SPS PDSCH is greater than one slot, the UE determines the granularity of the PDSCH-to-HARQ-ACK feedback timing indicator as the slot level.
-methods 1-3-2: determination by symbol level
For example, when the transmission period of the SPS PDSCH is less than one slot, the UE determines the granularity of the PDSCH-to-HARQ-ACK feedback timing indicator as a symbol level.
Examples 1 to 4: DL SPS or Configuration Grant (CG) period change method for aperiodic traffic
The transmission period of the DL SPS supported by the base station may be a unit of a slot level or a symbol level. When delay time sensitive information of devices operating in a factory is periodically generated and the period is not the value of the standard supported by the 3GPP standards organization or a multiple of its value, the base station may not be able to configure a valid DL SPS transmit period. For example, if there is a traffic pattern with a 2.5 symbol interval, the base station may not be able to allocate only DL SPS with a transmission period of 2 symbols or 3 symbols. Therefore, it is not necessary to introduce a signal for configuring a DL SPS transmission period having an aperiodicity or a signal to dynamically change the transmission period. The UE may dynamically change the transmission period by at least one of the following methods.
* Method 1-4-1: method for distributing transmission period of DL SPS with aperiodicity
The base station may be able to configure the DL SPS transmit period in a bitmap manner. For example, when bitmap information composed of 10 bits exists as a higher layer signal and 1 indicates DL SPS transmission and 0 indicates DL SPS is not transmitted, in the case where a unit of bit means a unit of slot, DL SPS transmission periods of various modes, even periods other than 10 slots, may be generated. In addition, the pattern may be repeated in units of 10 slots. Alternatively, the bitmap size and the portion indicated by the corresponding bit may be a slot, symbol, or group of symbols. The corresponding information may be independently configured as a higher layer signal, or the range of transmission periods that each bit may indicate may be changed according to the size of the bitmap. For example, when the size of the bitmap is 20, the time range indicated by each bit is 7 symbol units, and when the size of the bitmap is 10, the time range indicated by each bit may be in units of slots.
Alternatively, the base station may configure two or more DL SPS transmit periods with higher layer signals in advance and configure the time difference of each continuously transmitted DL SPS as a pattern. For example, a DL SPS transmit period having a 2 symbol interval and a 3 symbol interval may be determined for a 2.5 symbol traffic mode. Table 8 below is a table of the configuration of aperiodic DL SPS transmit period. Z is a prime number having a value of (up to) the first decimal unit and has the relationship X < Z < x+1. For example, when Z is 3.2, X has a value of 3. Gap 1 means a symbol interval between reception of a first SPS PDSCH resource and a second SPS PDSCH resource thereafter by the UE after receiving DCI indicating SPS activation. The gap 2 means a symbol interval between the second SPS PDSCH resource and the third SPS PDSCH resource thereafter. That is, the gap i means a symbol interval between the i-th SPS PDSCH resource and the (i+1) -th SPS PDSCH resource thereafter. The configuration is a parameter for selecting one of the various modes, and table 8 shows a configuration having a total of 9 modes. The corresponding parameter is provided to the UE by a higher layer signal or signal L1, and the UE may determine DL SPS PDSCH the transmission periodic pattern by a value indicated by the corresponding parameter. As another example, the value of one of the configurations may be implicitly determined from the value of the traffic generation period. For example, when the base station and the UE transmit/receive corresponding information by configuring the 2.3 symbol traffic pattern and the corresponding pattern through the higher layer signal configuration, the base station and the UE may determine the application configuration 3.
TABLE 8
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* Method 1-4-2: method for changing dynamic DL SPS transmission period
-method 1-4-2-1: including transmission period information in DCI indicating DL SPS activation
The DL SPS transmit period value may be included in the DCI information. A set of transmit period candidates was previously configured according to higher layer signals? * And may indicate a specific value in the group according to information included in the DCI. For example, when a transmission period is configured with a higher layer signal {1 slot, 2 slots }, one bit of a corresponding transmission period field is included in DCI, and the one bit indicates whether the transmission period is one slot or two slots. That is, the number of DCI bits is determined according to the group of transmission periods configured in accordance with the higher layer signal, and when the number of groups is N, the total ceil (log 2 (N)) bits are included in the DCI. DCI corresponds to non-fallback DCI such as DCI format 1_1, and in the case of fallback DCI such as DCI format 1_0, a fixed bit value and/or a periodic value associated with each corresponding bit value may always be applied even if no corresponding field is present or present? * . For example, in case of the fallback DCI, a field indicating a transmission period may have a fixed number of bits, i.e., n bits, or/and a value of the transmission period indicated by each value of the field may be fixed.
* Method 1-4-2-2: existing field utilization 1 in DCI format indicating DL SPS activation
When a field in the DCI format indicating DL SPS activation indicates a specific value, a value of another field may be used to indicate a transmission period instead of a previously indicated value. For example, when all bit values of a field indicating a HARQ process number in DCI indicating DL SPS activation indicate a value of "1", a field informing of time resource information may be used for the purpose of informing of one DL SPS transmission period among a set of DL SPS transmission periods previously configured according to a higher layer signal.
* Method 1-4-2-3: existing field utilization 2 in DCI format indicating DL SPS activation
In the case of a DCI format indicating DL SPS activation, a specific field in the corresponding DCI format itself may always indicate a transmission period, or a specific value in the specific field in the corresponding DCI format may indicate a transmission period. In one example, in case that the received DCI is verified in a format indicating SPS PDSCH activation, when the value of the time resource allocation field included in the DCI is a specific value, the UE determines that the value of the time resource allocation field is used as a value indicating a transmission period of the SPS PDSCH instead of a value indicating a start symbol and a length of an existing SPS PDSCH. The mapping relationship between the specific value of the time resource allocation field and the SPS PDSCH transmission period may be configured by higher layer signaling or may be predetermined.
* Methods 1-4-2-4: implicit transmit period information configuration based on search space
The transmission period value is dynamically changed according to a search space in which DCI indicating DL SPS activation is transmitted. As an example, DCI indicating DL SPS activation transmitted to a common search space indicates an SPS PDSCH transmission period a value, and the UE may implicitly determine a DCI indicating activation of DL SPS transmitted to a UE-specific search space indicates a transmission period B value.
The transmission period a and the transmission period B associated with the search space may be previously configured as higher layer signals by the UE.
* Method 1-4-2-5: implicit transmission period information configuration based on DCI format
The transmission period value is dynamically changed according to a DCI format indicating DL SPS activation. For example, DCI indicating DL SPS activation transmitted in DCI format 1_0 as a fallback DCI indicates an SPS PDSCH transmission period a value, and the UE may implicitly determine a value indicating SPS PDSCH transmission period B for DCI indicating activation of DL SPS transmitted in DCI format 1_1 as a non-fallback DCI. The transmission period a and the transmission period B may be previously configured as higher layer signals by the UE.
In the present disclosure, when the transmission period of the SPS is within one slot, the UE does not desire to configure or receive DL SPS PDSCH time resource information having a length exceeding the transmission period of the DL SPS. Here, when a corresponding configuration or instruction is given, the UE regards it as erroneous and ignores it. For example, when the transmission period of the DL SPS is 7 symbols, the UE must have the time resource length information of DL SPS PDSCH within 7 symbols.
Fig. 7 is a block diagram illustrating a process of a UE transmitting HARQ-ACK information based on a semi-static HARQ-ACK codebook for DCI indicating deactivation of an SPS PDSCH according to an embodiment of the present disclosure.
The UE receives SPS PDSCH configuration information as a higher layer signal. In this case, the information configured as the higher layer signal may include a transmission period, an MCS table, HARQ-ACK configuration information, and the like. After receiving the higher layer signal, the UE receives DCI for activating the SPS PDSCH from the base station at operation 700. After receiving the DCI indicating activation, the UE periodically receives the SPS PDSCH and transmits HARQ-ACK information corresponding thereto at operation 702. Thereafter, when there is no more downlink data to be periodically transmitted/received, the base station transmits DCI indicating SPS PDSCH deactivation to the UE, and the UE receives the DCI at operation 704.
At operation 706, the UE transmits HARQ-ACK information for DCI indicating deactivation of the SPS PDSCH according to the SPS PDSCH transmission period. For example, when the transmission period is greater than one slot, the UE transmits HARQ-ACK information of DCI indicating deactivation of the SPS PDSCH in a position of a HARQ-ACK codebook corresponding to HARQ-ACK information of the SPS PDSCH. The HARQ-ACK information may be transmitted through at least one of the above-described methods 1-1-1 or 1-1-2 of fig. 6A. When the transmission period is less than one slot, the UE transmits HARQ-ACK information indicating DCI information for SPS PDSCH deactivation through at least one of methods 1-2-1 to 1-2-5.
Referring to fig. 7, the above description is an operation applied when the UE is previously configured from the base station according to a higher layer signal to use a semi-static HARQ-ACK codebook. In addition, the description described above in fig. 7 may be limited to a case in which the UE is configured to implement only one HARQ-ACK transmission per slot in advance through a higher layer signal or standard or UE capability.
Fig. 8 is a block diagram illustrating a method for a UE to determine a dynamic HARQ-ACK codebook for SPS PDSCH reception according to an embodiment of the present disclosure.
Referring to fig. 8, in case the UE is configured to operate with a dynamic HARQ-ACK codebook in advance according to a higher layer signal, the UE starts to determine the size of the HARQ-ACK codebook of HARQ-ACK information to be transmitted in a specific slot at operation 800. The UE not only determines the size of the HARQ-ACK codebook of the dynamically scheduled PDSCH but also calculates the total number of SPS PDSCHs generated in slots corresponding to slots to which HARQ-ACK information is to be transmitted, and at operation 802, reflects the calculated number in the size of the HARQ-ACK codebook. The UE may be able to configure the dynamic HARQ-ACK codebook by at least one of the above-described pseudocode 3 or pseudocode 4. Thereafter, at operation 804, the UE ends determining the size of the HARQ-ACK codebook and transmitting HARQ-ACK information in the corresponding slot.
In addition, the description described above in fig. 8 may be limited to a case where the UE is configured to implement only one HARQ-ACK transmission per slot in advance through a higher layer signal or standard or UE capability. For reference, in case of repeatedly transmitting one SPS PDSCH across a slot boundary (such as 650 in fig. 6C), when determining the dynamic HARQ-ACK codebook, the UE determines the size of the HARQ-ACK codebook based on the last repeatedly transmitted slot of the SPS PDSCH. Specifically, in the case of slot k in 650 of fig. 6C, although SPS PDSCH 652 is transmitted in slot k, 652 is not counted as an effective number of SPS PDSCH for determining the dynamic HARQ-ACK codebook size. In contrast, the UE determines the dynamic HARQ-ACK codebook size in consideration of the SPS PDSCH 654 transmitted in slot k+1. In addition, according to the pseudo code 4, in the case where the value of the number of SPS PDSCH per slot (k) is determined when the dynamic HARQ-ACK codebook size in a specific slot is determined, the UE determines that the SPS PDSCH is valid in a slot (or end slot) to which the end symbol of the last SPS PDSCH in the repeatedly transmitted SPS PDSCH belongs.
Fig. 9 is a block diagram illustrating a method of transmitting HARQ-ACK information according to a DL SPS transmission period of a UE according to an embodiment of the present disclosure.
Referring to fig. 9, at operation 900, the UE receives configuration information provided by a higher layer signal or signal L1 regarding a maximum number of HARQ-ACK information transmissions per DL SPS transmission period or slot. The DL SPS transmit period and the HARQ-ACK information transmission condition per slot are then checked at operation 902. When condition 1 is satisfied, the UE performs transmission of the first type of HARQ-ACK information at operation 904. When condition 2 is satisfied, the UE performs a second type of HARQ-ACK information transmission at operation 906. Condition 1 may be equal to at least one of the following.
When the transmission period of DL SPS PDSCH is greater than one slot
When only one HARQ-ACK transmission per slot is possible
Condition 2 may be the same as at least one of the following.
When the transmission period of DL SPS PDSCH is less than one slot
-when two or more HARQ-ACK transmissions per slot are possible
In the case of the above-described first type HARQ-ACK information transmission, the following fields are included in the DCI format indicating the activation of DL SPS PDSCH.
PDSCH-to-HARQ-ACK feedback timing indicator: the time slot in which the PDSCH is transmitted and the time slot interval (in time slots) in which the HARQ-ACK information is transmitted are indicated. When one SPS PDSCH is repeatedly transmitted across slot boundaries as in 650 of fig. 6C, the reference to the slot in which the PDSCH was transmitted refers to the slot in which the SPS PDSCH was last repeatedly transmitted.
PUCCH resource indicator: the number of symbols, start symbols, PRB index, PUCCH format, etc. With the above information, the UE can configure PUCCH transmission resources and transmission formats to transmit the HARQ-ACK information of DL SPS PDSCH. In addition, a set of two field values may be configured in advance as a higher layer signal, and one of the values may be selected in accordance with DCI.
In the case of the above-described second type HARQ-ACK information transmission, the following fields are included in the DCI format indicating the activation of DL SPS PDSCH.
PDSCH-to-HARQ-ACK feedback timing indicator: indicates an end symbol of the PDSCH and a start symbol interval (in symbols) of transmitting HARQ-ACK information.
PUCCH resource indicator: the number of symbols, PRB index, PUCCH format, etc.
With the above information, the UE can configure PUCCH transmission resources and transmission formats to transmit the HARQ-ACK information of DL SPS PDSCH. In addition, a set of two field values may be configured in advance as a higher layer signal, and one of the values may be selected in accordance with DCI.
Fig. 10 is a block diagram illustrating simultaneous operation of UEs that dynamically change DL SPS transmit periods according to an embodiment of the present disclosure.
Referring to fig. 10, the ue receives higher layer information on the SPS PDSCH including information such as a transmission period, an MCS table, and HARQ-ACK information. Next, at operation 1000, the UE receives DCI indicating activation of an SPS PDSCH. The UE then receives the SPS PDSCH in the resource region determined by the higher layer signal and the signal L1 and transmits HARQ-ACK information corresponding thereto in operation 1002. At operation 1004, the UE receives DCI indicating SPS PDSCH variation information. Here, the variation information may include an SPS PDSCH transmission period value in addition to the MCS value or the size of the frequency and time resource region. For reference, as a possible method of changing the SPS PDSCH transmission period, at least one of the above-described methods 1-4-1 to 1-4-2 may be used. After receiving the DCI, the UE receives the SPS PDSCH according to the changed information and transmits HARQ-ACK information corresponding thereto at operation 1006.
In the case where the SPS PDSCH transmission period becomes the higher layer signal or signal L1, when an SPS PDSCH crossing a slot boundary, which may be generated according to the transmission period and the time resource region of the transmission/reception SPS PDSCH, occurs, the UE may transmit/receive the corresponding SPS PDSCH by at least one of the following methods.
-method 2-1: not transmitting/receiving corresponding SPS PDSCH
For example, when SPS PDSCH is allocated across time slot k and time slot k+1 as in 650 of fig. 6C, the UE considers that SPS PDSCH allocated as described above is incorrectly configured and not received, and does not transmit HARQ-ACK information corresponding thereto.
-method 2-2: repeatedly transmitting/receiving by dividing corresponding SPS PDSCH based on slot boundary
For example, when allocating SPS PDSCH across time slot k and time slot k+1 as in 650 of fig. 6B, the UE determines to repeatedly receive SPS PDSCH in the form of SPS PDSCH 652 and SPS PDSCH 654. In addition, the UE transmits only one HARQ-ACK information for this based on the last SPS PDSCH 654.
-method 2-3: partial transmission/reception is performed only in a slot preceding a slot boundary of a corresponding SPS PDSCH
For example, when allocating SPS PDSCH across time slot k and time slot k+1 as in 650 of fig. 6C, the UE determines that valid SPS PDSCH is allocated only to SPS PDSCH 652 and receives SPS PDSCH. That is, the UE and the base station do not transmit/receive with respect to the SPS PDSCH 654. When transmitting HARQ-ACK information, the UE transmits one based on only SPS PDSCH 652.
-method 2-4: corresponding transmission and reception is performed only for slots outside the slot boundary of the SPS PDSCH
For example, when SPS PDSCH is allocated across slot k and slot k+1 in 650 of fig. 6C, the UE determines that valid SPS PDSCH is allocated only to SPS PDSCH 654 and receives SPS PDSCH. That is, the UE and the base station do not perform transmission and reception with respect to the SPS PDSCH 652. When transmitting HARQ-ACK information, the UE transmits one based on only SPS PDSCH 654.
Fig. 11 is a UE operation diagram of a method of transmitting HARQ-ACK information for SPS release of a UE in case of activating two or more DL SPS according to an embodiment of the present disclosure.
Referring to fig. 11, when a UE may operate two or more activated DL SPS in one cell or/and one BWP, a base station may perform two or more DL SPS configurations for one UE. The reason for supporting two or more DL SPS configurations is that when the UE supports various services, different MCS or time/frequency resource allocation or period may be different for each service, so that it may be advantageous to configure DL SPS for each purpose.
For DL SPS, the UE may receive at least one of the higher layer signal configuration information as shown in table 9.
TABLE 9
The SPS index in the higher layer signal configuration information may be used to indicate which SPS is indicated by the DCI (L1 signaling) providing SPS activation or deactivation. Specifically, in the case where two SPS are configured as higher layer signals in one cell or/and one BWP, in order for the UE to know which of two DCIs indicating activation of SPS, SPS index information informing of SPS higher layer information may be required. As an example, a HARQ process number field in DCI indicating SPS activation or deactivation indicates an index of a specific SPS, and the UE may perform activation or deactivation of the SPS indicated by the HARQ process number field. Specifically, as shown in table 10, when DCI including CRC scrambled with CG-RNTI includes the following information and a New Data Indicator (NDI) field of the DCI indicates 0, the UE may determine that the DCI indicates a specific pre-activated SPS PDSCH release (deactivation) indicated by a HARQ process number field.
TABLE 10
| DCI field | DCI Format 0_0 | DCI Format 1_0 |
| HARQ process number | SPS index | SPS index |
| Redundancy version | Setting upIs '00' | Set to "00" |
| Modulation and coding scheme | All are set as '1' | All are set as '1' |
| Frequency domain resource assignment | All are set as '1' | All are set as '1' |
In table 10, one HARQ process number may indicate one SPS index, or may indicate a plurality of SPS indexes. In addition to the HARQ process number field, one or more SPS indices may be indicated by other DCI fields (time resource field, frequency resource field, MCS, RV, PDSCH-to-HARQ timing field, etc.). Basically, one SPS may be activated or deactivated by one DCI.
The location of the type 1HARQ-ACK codebook for the HARQ-ACK information of the DCI indicating SPS PDSCH release is the same as the location of the type 1HARQ-ACK codebook corresponding to the reception location of the corresponding SPS PDSCH. When the position of the HARQ-ACK codebook received corresponding to the candidate SPS PDSCH in the slot is k1, the position of the HARQ-ACK codebook for DCI indicating release of the corresponding SPS PDSCH is also k1. Therefore, when DCI indicating the release of SPSPDSCH is transmitted in slot k, the UE does not expect to receive PDSCH corresponding to HARQ-ACK codebook position k1 in the same slot k, and when this occurs, the UE regards it as an error condition.
Although DCI formats 0_0 and 1_0 are given as examples in table 10, DCI formats 0_1 and 1_1 may also be applied, and DCI formats 0_x and 1_x may be fully extended and applied to other DCI formats 0_x and 1_x. Through the above-described operations, the UE receives DCI indicating the reception of an SPS PDSCH higher layer signal and the activation of the SPS PDSCH such that one or more SPS PDSCH operate simultaneously in one cell or/and one BWP at operation 1100. Next, at operation 1102, the UE periodically receives an activated SPS PDSCH in one cell or/and one BWP and transmits HARQ-ACK information corresponding thereto. The UE determines PUCCH resources to transmit HARQ-ACK information corresponding to the SPS PDSCH through slot interval information of a PDSCH-to-HARQ-ACK feedback timing field included in the activated DCI information, accurate time and frequency information in a corresponding slot of n1PUCCH-AN information included in the SPS higher layer configuration information, and PUCCH format information. When there is no PDSCH-to-HARQ-ACK feedback timing field included in the DCI information, the UE assumes that one value previously configured as a higher layer signal is a default value and determines to apply the corresponding value.
When the UE receives DCI indicating deactivation of one SPS PDSCH with the type 1HARQ-ACK codebook configured, the UE determines that the position of the HARQ-ACK codebook of HARQ-ACK information of the corresponding DCI is the corresponding HARQ-ACK codebook position received by the corresponding SPS PDSCH and transmits HARQ-ACK information at operation 1104. When deactivation of two or more SPS PDSCH is indicated by one DCI, the UE may have a problem of at which HARQ-ACK codebook location HARQ-ACK information for the DCI is to be included and transmitted. To address this issue, at operation 1106, the UE transmits HARQ-ACKs using at least one of the following methods.
-method 3-1: the position of the HARQ-ACK codebook of SPS PDSCH following SPS configuration with the lowest SPS index (or highest SPS index)
According to this method, when two or more SPS PDSCH are deactivated by DCI indicating deactivation, HARQ-ACK information corresponding to the DCI indicating deactivation is included by the UE in a HARQ-ACK codebook location corresponding to SPS PDSCH reception having a minimum value (or a highest value or a middle value, etc.) in an index of the corresponding SPS PDSCH. For example, when SPS PDSCH index 1, SPS PDSCH index 4, and SPS PDSCH index 5 are simultaneously deactivated by one DCI, the UE transmits HARQ-ACK information of the DCI in a position of the HARQ-ACK codebook corresponding to SPS PDSCH index 1 (or 5).
-method 3-2: including HARQ-ACK information in the earliest HARQ-ACK codebook occasion (latest HARQ-ACK codebook occasion)
According to this method of the present invention,when two or more SPS PDSCH are deactivated by the DCI indicating deactivation, the UE includes HARQ-ACK information corresponding to the DCI indicating deactivation in an earliest (or latest) HARQ-ACK codebook position among positions of HARQ-ACK codebooks corresponding to the SPS PDSCH. For example, in the case where SPS PDSCH index 1, SPS PDSCH index 4, and SPS PDSCH index 5 are simultaneously deactivated by one DCI, the HARQ-ACK codebook position received when the PDSCH corresponding to SPS PDSCH index 1 is k 1 When the HARQ-ACK codebook position for PDSCH reception corresponding to SPS PDSCH index 2 is k 2 When the position of the HARQ-ACK codebook received by PDSCH corresponding to SPS PDSCH index 3 is k 3 When or when k 1 <k 2 <k 3 At time, UE is at k 1 (or k) 3 ) HARQ-ACK information corresponding to the DCI. When the positions of HARQ-ACK codebooks received by PDSCH of two or more SPS PDSCH are identical, the UE regards them as one and performs the above operations.
-method 3-3: all HARQ-ACK codebook occasions include HARQ-ACK information
According to this method, when two or more SPS PDSCH are deactivated by DCI indicating deactivation, the UE includes HARQ-ACK of DCI at all HARQ-ACK codebook positions and transmits the resulting information, instead of selecting HARQ-ACK codebook positions according to the above-described method a-3-1 or a-3-2. For example, when SPS PDSCH index 1, SPS PDSCH index 4, and SPS PDSCH index 5 are simultaneously deactivated by one DCI, the UE transmits HARQ-ACK information of the DCI in HARQ-ACK codebook positions corresponding to SPS PDSCH indexes 1, 4, and 5. When at least two or more HARQ-ACK codebook positions in the SPS PDSCH are identical, the UE regards them as one and transmits HARQ-ACK information.
As another example, in the case where SPS PDSCH index 1, SPS PDSCH index 4, and SPS PDSCH index 5 are simultaneously deactivated by one DCI, the HARQ-ACK codebook position received when the PDSCH corresponding to SPS PDSCH index 1 is k 1 When the HARQ-ACK codebook position for PDSCH reception corresponding to SPS PDSCH index 2 is k 2 When the position of the HARQ-ACK codebook received by PDSCH corresponding to SPS PDSCH index 3 is k 3 When, and when k 1 <k 2 <k 3 At time, UE is at k 1 、k 2 And k 3 HARQ-ACK information corresponding to the DCI. When the positions of HARQ-ACK codebooks received by PDSCH of two or more SPS PDSCH are identical, the UE regards them as one and performs the above operations.
-method 3-4: gNB configuration
This method first means that the base station determines the above-described methods a-3-1 to a-3-3 as high-layer signals. Alternatively, secondly, the base station may directly determine the position of the HARQ-ACK codebook as a higher layer signal or signal L1, in addition to methods 3-1 to 3-3. At this time, when two or more SPS PDSCH are deactivated by one DCI, the base station configures one or more HARQ-ACK codebook positions within candidate HARQ-ACK codebook positions corresponding to the unactivated SPS PDSCH using the higher layer signal or signal L1, or the base station can determine the HARQ-ACK position as the higher layer signal or signal L1.
When receiving DCI indicating release or deactivation of one or more SPS PDSCH, the UE does not expect to receive PDSCH scheduled by another DCI such that HARQ-ACK codebook location for transmitting HARQ-ACK information of the corresponding DCI and HARQ-ACK codebook location for transmitting HARQ-ACK information of PDSCH scheduled by another DCI are identical to each other. When such a schedule is received, the UE regards it as an error condition and performs any operation. For example, in this case, the UE may consider another DCI as an error and may not receive the PDSCH.
Next, an example of a signal transmission/reception scheme for a multicast service in a wireless communication system according to various embodiments of the present disclosure will be described with reference to fig. 12.
Fig. 12 is a diagram schematically illustrating an example of a signal transmission/reception scheme for a multicast service in a wireless communication system according to an embodiment of the present disclosure.
Referring to fig. 12, an example of multicasting will be described in which a base station 1201 transmits the same control information and the same data to a plurality of UEs (e.g., UEs 1203, 1205, 1207, and 1211). First, the base station may inform a system information block (SIB, hereinafter referred to as "SIB") for the UE, or inform the G-RNTI, which may be used to receive control information of the multicast, through preset information or a preset message, to the plurality of UEs 1203, 1205, 1207, and 1211. Here, the G-RNTI is a group radio network temporary identifier (G-RNTI, hereinafter referred to as "G-RNTI").
Each of the UEs 1203, 1205, 1207, and 1211 receives the G1-RNTI (or G-RNTI) transmitted from the base station 1201, and receives the multicast control information using the G-RNTI. The G-RNTI is a Cyclic Redundancy Check (CRC) of multicast control information, for example, downlink control information (DCI, hereinafter referred to as "DCI") is scrambled and transmitted.
In fig. 12, the UE 1209 may be a UE accessing the base station 1201, or a UE having received a cell radio network temporary identifier (C-RNTI, hereinafter "C-RNTI") from the base station 1201. In addition, the UE 1211 may be a UE accessing the base station 1201, and may be a UE that has received a C-RNTI from the base station 1201 and also received a multicast G-RNTI.
Meanwhile, when the same control information and data are transmitted and one or more UEs may receive the transmitted same control information and data, this may be referred to as multicasting of the control information and data. In addition, as in UE 1209 or UE 1211 in fig. 12, when the C-RNTI or UE-specific RNTI is received and only some UEs are receiving control information and data using the C-RNTI or UE-specific RNTI, this may be referred to as unicast of control information and data.
Meanwhile, in various embodiments of the present disclosure, the UE may be configured to receive a control channel signal and a data channel signal for multicasting from the transmitting end a and a control channel signal and a data channel signal for unicasting from the transmitting end B. In various embodiments of the present disclosure, transmitting end a and transmitting end B may be the same transmitter or different transmitters. In addition, in various embodiments of the present disclosure, each of transmitting end a and transmitting end B may be a base station, or may be a vehicle or general UE.
When each of the transmitting end a and the transmitting end B is a base station, multicast data and unicast data may be transmitted from the base station, that is, transmitted through a Uu link.
In contrast, when each of the transmitting end a and the transmitting end B is a vehicle or a general UE, the multicast transmission and the unicast transmission may be side link transmission. In this case, each of the transmitting end a and the transmitting end B may be a UE that operates as a leader node or an anchor node in the corresponding group such that each of the transmitting end a and the transmitting end B may perform multicast transmission for at least one other terminal in the corresponding group or a UE capable of receiving control information from at least one other UE. In addition, in various embodiments of the present disclosure, it is apparent that the transmitting end a may be a vehicle and the transmitting end B may be a base station. In addition, it is assumed that the transmitting terminal a and the transmitting terminal B are one transmitting terminal to describe various embodiments of the present disclosure, but it is apparent that the various embodiments of the present disclosure can be applied even when the transmitting terminal a and the transmitting terminal B are different transmitting terminals.
On the other hand, for receiving the control channel signal and the data channel signal for multicast, the UE may receive an RNTI (in the following description, for receiving the control channel signal and the data channel signal for multicast) corresponding to a unique identifier (ID, hereinafter referred to as "ID") from the base station or another terminal in the group (here, another terminal in the group may be a leader node), it should be noted that the RNTI corresponding to the unique ID may be used in combination with the G-RNTI or the group common RNTI or the Multicast and Broadcast Service (MBS) -RNTI or the group identifier. The UE may receive a control channel signal for multicast using the G-RNTI and may receive a data channel signal based on the control channel signal for multicast.
In addition, in various embodiments of the present disclosure, a control channel for data scheduling may be used interchangeably with a physical downlink control channel (PDCCH: physical downlink control channel, hereinafter referred to as "PDCCH") or a physical side link control channel (PSCCH: physical side link control channel, hereinafter referred to as "PSCCH"). The data channel may be used interchangeably with physical downlink shared channel (PDSCH: physical downlink control channel, hereinafter referred to as "PDSCH") or physical side shared channel (PSSCH: physical side link control channel, hereinafter referred to as "PSSCH"). The feedback channel may be used interchangeably with physical uplink control channel (PUCCH, hereinafter "PUCCH") or PSCCH. In addition, in various embodiments of the present disclosure, it is assumed that control information for scheduling received by a UE is DCI as an example, but it is apparent that the control information for scheduling may be implemented in various forms other than DCI.
In various embodiments of the present disclosure, transmitting the same data by one UE to multiple UEs or transmitting the same data by a base station to multiple UEs may be referred to as multicasting or multicasting. It should be noted that in various embodiments of the present disclosure, multicasting may be used interchangeably with multicasting.
In addition, in various embodiments of the present disclosure, "data" may include Transport Blocks (TBs) transmitted over a shared channel such as PDSCH, PUSCH, PSSCH.
In the present disclosure, examples described as higher layer signals may mean that the UE shares higher layer signals, such as MIB or SIB, or may mean UE-specific higher order signals, such as RRC or MAC CE.
In the present disclosure, an example described as the signal L1 may mean a specific field in DCI or DCI format information, or may mean DCI CRC and scrambled RNTI information or DCI transmission/reception control region resource information.
In the present disclosure, multicast data may be scheduled by DCI or may be semi-persistent scheduled without DCI, such as SPS. In addition, the presence or absence of HARQ-ACK feedback for multicast data may be notified by a higher layer signal or signal L1. In addition, when HARQ-ACK feedback for multicast data is configured, the corresponding HARQ-ACK feedback type may be divided into two types. The first type transmits a NACK when data decoding fails, and transmits an ACK when data decoding is successful. This is referred to as a first HARQ-ACK feedback type (ACK/NACK information report). The second type is a case where HARQ-ACK feedback is not performed when data decoding is successful and NACK is transmitted only when data decoding fails, which is referred to as a second HARQ-ACK feedback type (only NACK information is reported).
With the first HARQ-ACK feedback type, the base station can know whether data decoding is successful or failed for each UE that receives multicast data. Thus, the optimized group data of the failed UE may be retransmitted. In addition, when the UE misses DCI for scheduling corresponding data, neither ACK nor NACK is transmitted by the UE. This is called no Detection (DTX) and the base station may perform a more optimal retransmission in view of this. Specifically, when retransmitting data, the base station configures the data information segment to be transmitted using a Redundancy Version (RV). When the base station reschedules the data because the UE fails to decode the data, the base station changes the RV value so that the decoding performance of the UE can be improved by transmitting and receiving more check bits. On the other hand, when the UE does not receive the data itself due to the scheduled DCI of the first data being missed, the base station may retransmit the data with the same RV value as the first transmission. According to this method, since HARQ-ACK feedback resources need to be configured for each UE that receives multicast data, many uplink resources may be required.
On the other hand, with the second HARQ-ACK feedback type, the base station can only know whether data decoding of multicast data fails, and when a UE receiving multicast fails to decode data, NACK information can generally be transmitted through a common HARQ-ACK feedback resource. Thus, unlike the first HARQ-ACK feedback type, it is impossible to determine whether multicast data decoding of each UE is successful. Thus, when a NACK is detected (or the detected received energy is above a certain level) at least through the HARQ-ACK feedback resource, the base station may determine that at least one terminal fails to decode the multicast data. Thus, the base station retransmits the corresponding multicast data. Some or some terminals receiving the multicast data may report NACK information as a common HARQ-ACK feedback resource according to the corresponding backoff type. It will be possible to retransmit the multicast data with small HARQ-ACK feedback resources. However, when some UEs miss DCI scheduling multicast data, they will not be able to transmit HARQ-ACK information. Thus, when at least one of the UEs receiving the multicast data does not transmit NACK, the base station may consider that all UEs have successfully received the multicast data. Thus, a UE that has missed DCI scheduling multicast data may not retransmit the corresponding data.
In the case of transmitting and receiving multicast data through SPS, since there is no separate scheduling DCI, a UE receiving multicast data will not miss DCI reception. Thus, some disadvantages of the second HARQ-ACK feedback type described above may not be present in SPS. However, when the SPS receives higher layer signal information as shown in table 9 and receives the remaining information through the DCI, activation of the SPS will be indicated by the DCI, and the UE receives data scheduled by the DCI indicating the activation of the SPS and reports its HARQ-ACK information, thereby completing the activation of the SPS. Similarly, with DCI indicating release (or deactivation) of SPS, the UE reports HARQ-ACK information of DCI without separate data transmission and reception, thereby completing SPS release. When SPS is transmitted/received for multicast data, there is a possibility that SPS is transmitted/received based on multicast according to DCI indicating activation and release of SPS. Thus, the following describes a process of transmitting and receiving multicast data using SPS.
Fig. 13 is a diagram illustrating an SPS-based multicast data transmission/reception method according to an embodiment of the present disclosure. Fig. 13 shows an SPS for multicast data when the SPS described in fig. 3, 4, 5, 6A, 6B, 6C, 7, 8, 9, 10, and 11 is mainly an SPS for unicast data.
Referring to fig. 13, when the SPS operation procedure for unicast data is applied to multicast as it is, a UE receiving multicast data first receives SPS higher layer signal information as shown in table 9 in advance, receives DCI 1301 for activating a corresponding SPS, receives PDSCH 1303 scheduled by the DCI, and may then report PDSCH decoding result to a base station as HARQ-ACK 1313. Next, the UE receiving the multicast data receives the PDSCHs 1305 and 1307 without DCI scheduling in a period 1311 previously configured as a higher layer signal based on the slot of transmitting and receiving the PDSCH 1303, and may report HARQ-ACKs 1315 and 1317 for this. Thereafter, the UE receiving the multicast data receives DCI 1309 indicating release of a corresponding SPS, and reports a DCI decoding result through HARQ-ACK 1319 scheduled by the DCI. Next, the release of SPS may be completed.
The above description of SPS operation corresponds to the case where all UEs have successfully received DCI information indicating activation or release of SPS for multicast data. When some UEs attempting to receive multicast data miss DCI information indicating SPS activation or release, since SPS operations cannot be properly performed, it may be necessary to improve SPS operations in consideration of the case where the UEs miss DCI information.
In addition, when HARQ-ACKs 1313 and 1319 corresponding to DCI 1301 or 1309 indicating SPS activation or release are the second HARQ-ACK feedback type reporting only NACK information, although small HARQ-ACK information resources may be used to transmit and receive data, it cannot be guaranteed that all UEs well receive all DCI 1301 and 1309 indicating SPS activation DCI or release. For this reason, HARQ-ACKs 1313 and 1319 corresponding to DCIs 1301 and 1309 indicating SPS activation or release should be the first HARQ-ACK feedback type. That is, HARQ-ACK 1313 for multicast data 1303 in which the corresponding DCI 1301 exists is a first feedback type, and at 1313, the base station may receive ACK or NACK.
After SPS is activated, HARQ-ACKs 1315 and 1317 for multicast data 1305 and 1307 received without scheduling DCI may be a first HARQ-ACK feedback type or a second HARQ-ACK feedback type, and information indicating whether the first HARQ-ACK feedback type or the second HARQ-ACK feedback type is applied may be indicated by a specific field in the DCI activating SPS or may be signaled by a higher order. When the HARQ-ACK 1313 corresponding to the DCI 1301 indicating SPS activation is the first HARQ-ACK feedback type, the base station may determine whether the corresponding DCI (first DCI) has been well received by the UE receiving the multicast data through ACK, NACK, or DTX.
Specifically, when receiving the ACK or NACK, the base station may determine that the UE has at least well received DCI (first DCI) for activating SPS. On the other hand, when the base station determines that DTX is fed back, the base station may determine that the corresponding UE has not received DCI (first DCI) for activating SPS. Thus, the base station may be able to retransmit DCI (second DCI, 1302) indicating SPS activation information at least for the DTX UE again. However, since there is a possibility that DCI (second DCI) information for activating SPS has RNTI scrambled into one RNTI (G-RNTI) by all multicast UEs, a UE that well receives DCI (first DCI) for activating SPS may also receive the second DCI.
Thus, it is inefficient for the base station to configure resources over the second DCI other than SPS previously activated by at least some UEs over the first DCI. Thus, it would be reasonable for the base station to activate at least one of the SPS resources 1305 and 1307 after the first SPS resource 1303 according to the second DCI for the UE that missed the first DCI. This is because when SPS resource 1305 is activated by the second DCI, it has the same period as SPS resource 1303 activated by the first DCI. Thus, UEs receiving the first DCI and the second DCI may consider SPS having the same period to be activated.
In the case of a UE that well receives the first DCI 1301, the UE may receive SPS resources 1305 and 1307 without the second DCI 1302. Accordingly, in the case of the corresponding UE, when the corresponding information is the same as the first DCI 1301, even if the second DCI 1302 is received, the corresponding information may be ignored. In this case, the UE may report HARQ-ACK information 1315 and 1317 for SPS resources 1305 and 1307 configured in advance. The corresponding HARQ-ACK feedback may be of the first HARQ-ACK feedback type or of the second HARQ-ACK feedback type. Alternatively, in the case of the corresponding UE, although the first DCI 1301 is well received, information indicated by the second DCI 1302 may be followed. Accordingly, the corresponding UE may receive the SPS resource region 1305 indicated by the second DCI 1302 and report HARQ-ACK information of the received information.
As another example, from the perspective of the base station, the HARQ-ACK information of DCI scheduled for SPS activation or release and the resource region of HARQ-ACK information for other SPS PDSCH may be the same or different from each other, and the UE may be informed of these resources in advance through a higher layer signal or signal L1. In addition, in addition to DCI scrambled by a multicast data-related RNTI (e.g., G-RNTI), HARQ-ACK resources may be additionally configured differently for each multicast terminal through DCI scrambled by a unicast data-related RNTI (e.g., C-RNTI). Accordingly, the resource region where the HARQ-ACK information 1315 for the UE to receive the second DCI 1302 (that is, the HAQ-ACK resource region for whether the second DCI is received) and the resource region where the HARQ-ACK information 1315 corresponding to the UE receiving the second DCI 1302 but ignoring it or receiving SPS resources 1305 but not receiving the second DCI 1302 (that is, the HARQ-ACK resource region for the SPS PDSCH 1305) are transmitted and received may be the same or different, and may also have different HARQ-ACK feedback types.
The above HARQ-ACK information may mean PUCCH or PUSCH resources through which HARQ-ACK feedback information is transmitted and received, or may mean HARQ-ACK information such as ACK/NACK/DTX itself. HARQ-ACK information is information transmitted by a UE to a base station. The SPS resources described above may mean a resource region in which the SPS PDSCH is transmitted/received, or may be a resource region of a specific SPS index.
Similarly, when some UEs do not receive corresponding DCI with respect to DCI 1309 indicating release of SPS, the base station may retransmit the corresponding DCI information. Accordingly, since the UE missing the DCI 1309 indicating the corresponding SPS release determines that the SPS can continue to operate, HARQ-ACK information of the previously configured SPS is not valid. However, it is preferable that resources through which corresponding HARQ-ACK information is transmitted and received are not used for other UEs until SPS of all UEs is released. When DCI 1309 indicating SPS release is transmitted as multicast, if DCI indicating the same SPS release is then retransmitted, a UE that has transmitted HARQ-ACK information 1319 for this may not transmit HARQ-ACK information for the retransmitted DCI. This is because since acknowledgement information (HARQ-ACK information) for SPS release is transmitted to the base station, the UE does not need to transmit the same information again, and thus power consumption of the UE can be reduced.
As another example, when DCI 1309 indicating SPS release is transmitted as multicast, a UE having transmitted HARQ-ACK information 1319 of the DCI may transmit HARQ-ACK information of the DCI without ignoring the corresponding DCI even when DCI indicating the same SPS release is retransmitted later. Because there is a possibility that the base station will miss the acknowledgement information (HARQ-ACK information) for SPS release even though the UE previously transmitted the information. Thus, for a completed SPS release, HARQ-ACK information needs to be transmitted when SPS release DCI is continuously transmitted.
Fig. 13 basically considers the case where the SPS for multicasting data is activated or released by a combination of a higher layer signal and a signal L1, but the case where the SPS is configured only as a higher layer signal will be described below. When the SPS for multicast is configured only to the higher layer signals, at least some of the information shown in the following table 11 should be configured to the higher layer signals, except for table 9, for the UE.
TABLE 11
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Thus, as a higher layer signal, the UE receives the configuration of at least some of the pieces of information in tables 9 and 11, periodically receiving SPS-based multicast data without reporting HARQ-ACK information for individual SPS activation or release. The high layer signal may be a UE specific high layer signal, a specific group of high layer signals for multicasting UEs, or a high layer signal such as SIB.
Fig. 14 is a flowchart illustrating a method of operating an SPS of a UE according to an embodiment of the present disclosure.
Referring to fig. 14, the ue determines whether to activate a corresponding SPS PDSCH through DCI indicating SPS higher layer signal reception and SPS PDSCH activation. The information on whether the corresponding SPS PDSCH is unicast or multicast is classified by a higher layer signal or classified as an RNTI scrambled to DCI indicating SPS PDSCH activation, specific bit field information in DCI, or DCI format information. At operation 1400, the UE receives data in an SPS PDSCH resource region indicated by the scheduling DCI and transmits HARQ-ACK information.
At this time, when the SPS PDSCH is multicast as described above in fig. 13, different HARQ-ACK feedback types may be applied according to whether the corresponding HARQ-ACK information is HARQ-ACK information for SPS PDSCH reception indicated by the scheduling DCI or HARQ-ACK information for SPS PDSCH reception periodically received without the scheduling DCI. Also in this case, the UE may transmit HARQ-ACK information using different HARQ-ACK resources in operation 1402. The UE may be informed of HARQ-ACK resources by SPS higher layer signals or DCI indicating SPS PDSCH activation, respectively. After periodically receiving the SPS PDSCH later, the UE receives DCI indicating deactivation of the SPS PDSCH in operation 1404 and transmits HARQ-ACK information to complete release of the SPS PDSCH in operation 1406.
As another example, when the SPS PDSCH is for multicast data, the UE may not report HARQ-ACK information for SPS PDSCH periodically received without separate DCI scheduling, except for reporting HARQ-ACK information for DCI indicating SPS PDSCH activation or release, and may inform whether to configure such operation through a higher layer signal or signal L1.
Fig. 15 is a flowchart illustrating a method of operating an SPS of a UE according to an embodiment of the present disclosure.
Referring to fig. 15, when the corresponding SPS PDSCH is for multicast data, the UE may be able to activate or release the SPS PDSCH only with higher layer signals without DCI indicating separate activation or release of the SPS PDSCH. Specifically, in operation 1500, the UE receives a higher layer signal indicating activation of an SPS PDSCH. In this case, the higher layer signal may be a multicast-based higher layer signal, a unicast-based higher layer signal (or a UE-specific higher layer signal), or a UE-common higher layer signal, such as SIB. In particular, the multicast-based higher layer signal may be a destination higher layer signal for transmitting and receiving the same higher layer signal to and from a group of UEs in order to transmit and receive multicast data. UEs receiving corresponding higher layer signal information may be included in a group for transmitting and receiving the same multicast data. Thereafter, in operation 1502, the UE may receive an SPS PDSCH for multicast data and transmit HARQ-ACK information in a periodic resource region designated as a higher layer signal. Alternatively, HARQ-ACK information may or may not exist, and the presence or absence of HARQ-ACK information for the SPS PDSCH may be configured as a higher layer signal. In addition, the HARQ-ACK information may be a first HARQ-ACK feedback type or a second HARQ-ACK feedback type, and this feedback type may be configured as a higher layer signal. Thereafter, when the base station deactivates the SPS PDSCH for multicast data transmission and reception, in operation 1504, a higher layer signal indicating the deactivation of the SPS PDSCH may be transmitted and received to the UE receiving the corresponding multicast data, and thereafter, the UE may no longer periodically receive the SPS PDSCH.
Fig. 16 is a diagram illustrating HARQ-ACK information reporting according to PDSCH scheduling of a specific HARQ process according to an embodiment of the present disclosure.
Referring to fig. 16, a base station transmits a first PDSCH 1600 corresponding to a first HARQ process to a UE and receives a PUCCH or PUSCH including HARQ-ACK information 1602 for this. Next, the base station transmits a second PDSCH 1610 corresponding to the first HARQ process to the UE, and receives a PUCCH or PUSCH including HARQ-ACK information 1612 for the second PDSCH 1610. In fig. 16, the first PDSCH and the second PDSCH may include the same Transport Block (TB) or different TBs, which may be distinguished by the UE by NDI included in control information (DCI). The identification of the specific HARQ process corresponding to the first PDSCH is indicated by the HARQ process number field included in the DCI scheduling the first PDSCH, or may be determined according to the period and time of transmitting/receiving the corresponding SPS PDSCH and the number of HARQ processes in the case of transmitting and receiving the SPS PDSCH without the DCI. As an example, the HARQ process may be determined by the following equation 1.
[ equation 1]
HARQ Process ID＝[floor(CURRENT_slotΥ10/(numberOfSlotsPerFrameΥperiodicity))]modulo nrofHARQ-Processes+harq-ProcID-Offset
In equation 1, current_slot is a slot number through which the SPS PDSCH is transmitted and received, and numberofslot perframe is the total number of slots in one slot (10 ms) and may have a different number of slots according to subcarrier spacing. For example, in the case of 15kHz, there are 10. The periodicity is a transmission/reception period of the corresponding SPS PDSCH. nrofHARQ-Processes is the number of HARQ Processes that can be configured in the corresponding SPS PDSCH, and may have a value between 1 and 16. The HARQ-ProcID-Offset is a HARQ process ID Offset value and may have a value between 0 and 16 and there may be no corresponding parameter itself.
When the UE receives the first PDSCH 1600 corresponding to the first HARQ process, receives the second PDSCH corresponding to the first HARQ process from the base station before transmitting the last symbol of the PUCCH or PUSCH including the HARQ-ACK information 1602 for the first PDSCH 1600 or receives the PDCCH including the DCI for scheduling the PDSCH, the UE regards this as an error condition and may or may not receive the corresponding PDSCH. For this reason, the UE places a separate buffer for each HARQ process number and reports HARQ-ACK information generated after demodulating/decoding a separate PDSCH. This is because when PDSCH with the same HARQ process number or PDCCH scheduling the corresponding PDSCH is received before reporting the corresponding HARQ-ACK information, a problem may occur in processing the PDSCH processed in the corresponding buffer. Thus, when PDSCH 1600 and 1610 have the same HARQ process for smooth PDSCH demodulation/decoding and HARQ-ACK reporting for the UE, the base station must guarantee scheduling, as shown in fig. 16.
When the PDSCH 1600 is multicast data and the presence or absence of its HARQ-ACK information transmission is determined by the higher layer signal or signal L1, the PUCCH or PUSCH including the actual HARQ-ACK information 1602 for the PDSCH 1600 may not be present. In this case, since there is no actual HARQ-ACK information 1602 as shown in fig. 16, it is difficult for the base station to determine from which point of time the UE can receive the PDSCH 1610 for the first HARQ process number or can receive the PDCCH including DCI for scheduling the PDSCH 1610. Therefore, when there is no actual HARQ-ACK information transmission/reception, a timing point for scheduling PDSCH with the same HARQ process needs to be defined, and the base station and the UE can support this by at least one of the following methods.
-method 3-1: determined by PDSCH-to-HARQ feedback timing and PUCCH resource indicator included in the DCI. In control information (DCI) for scheduling PDSCH, there is a PDSCH-to-HARQ feedback timing field indicating a difference between a slot in which PDSCH is transmitted/received and a slot in which HARQ-ACK information is transmitted/received. In addition, there is a 'PUCCH resource indicator' field informing of transmission resource (e.g., a starting symbol and a transmission length of PUCCH) information of a PUCCH to be transmitted in a slot in which corresponding HARQ-ACK information is transmitted and received. The two fields may be configured by the higher layer signal and one value configured by the higher layer signal may be used when there is no corresponding field. At this time, the corresponding base station and UE serve only as information for determining at which point of time PDSCH can be scheduled again using the same HARQ process described in fig. 16, and transmission and reception of PUCCH including actual HARQ-ACK information does not occur.
Method 3-1 may be limitedly applied to a case in which HARQ-ACK information of PDSCH for scheduling multicast data may be indicated to another specific field in DCI by a higher layer signal, regardless of whether HARQ-ACK information is transmitted or not. Alternatively, method 3-1 may be operated by configuring a separate higher layer signal. Alternatively, method 3-1 may be applied to a limited extent to UEs that have reported specific UE capabilities related to the same operation as method 3-1. For reference, the method 3-1 may be a method applicable even when actual HARQ-ACK information transmission is performed through the PUCCH or PUSCH. At this time, the PUCCH including HARQ-ACK information is determined by PDSCH-to-HARQ feedback timing and PUCCH resource indicator. When the PUCCH including HARQ-ACK information overlaps another PUSCH, it is determined by additionally considering transmission resources of the scheduled PUSCH other than the PUCCH. On the other hand, if there is no actual HARQ-ACK information transmission in the method 3-1, since there is no PUCCH resource including the actual HARQ-ACK information, PUSCH transmission resources may not be considered separately.
-method 3-2: let us assume the minimum PDSCH-to-HARQ processing time (PDSCH processing time) value of the UE. When the UE is not instructed to report HARQ-ACK information through the higher layer signal or signal L1, it is assumed that the PDSCH processing time is a reference timing for considering a time for transmitting/receiving the PDSCH using the same HARQ process number or transmitting/receiving the PDCCH including DCI for scheduling the PDSCH. For example, the base station and the UE transmit and receive a first PDSCH scheduled with a first HARQ process number up to x symbols, and then transmit and receive a second PDSCH scheduled with the first HARQ process number after x+n symbols. Here, n may be a minimum PDSCH processing time value of the UE.
Specifically, next, PDSCH processing procedure time will be described. When the base station schedules the UE to transmit the PDSCH using DCI format 1_0, 1_1, or 1_2, the UE may need PDSCH processing time for receiving the PDSCH through a transmission method (modulation/demodulation and coding indication index (MCS), demodulation reference signal related information, time and frequency resource allocation information, etc.) indicated through the DCI. In NR, PDSCH processing time is defined in consideration of this. The PDSCH processing time of the UE may follow equation 2 below.
[ equation 2]
T proc,1 ＝(N 1 +d 1,1 +d 2 )(2048+144)κ2 -μ T c +T ext
T described above in equation 2 proc,1 Each variable of (a) may have the following meaning.
N 1 : the number of symbols determined according to UE processing capability 1 or 2 and the parameter set μ according to UE capability. The values of table 12 may be obtained when reporting as UE processing capability 1 according to the capability report of the UE. The values of table 13 may be obtained when the available UE processing capability 2 is configured through higher layer signaling and the UE processing capability 2 is reported. Parameter set μmay correspond to μ PDCCH 、μ PDSCH 、μ UL To be the minimum of T proc,1 Maximize, and μ PDCCH 、μ PDSCH Sum mu UL May refer to a parameter set of a PDCCH scheduling a PDSCH, a parameter set of a scheduled PDSCH, and a parameter set of an uplink channel transmitting HARQ-ACKs, respectively.
TABLE 12
TABLE 13
κ：64
T ext : when the UE uses the shared spectrum channel access method, the UE may calculate Text and apply it to PDSCH processing time. Otherwise, let Text be 0.
When l of PDSCH DMRS position value is indicated 1 When it is 12, N in Table 12 1,0 With a value of 14, otherwise with a value of 13.
For PDSCH mapping type a, the last symbol of PDSCH is the i-th symbol in the slot in which PDSCH is transmitted, and if i<7, d 1,1 Is 7-i, otherwise d 1,1 Is 0.
d 2 : when the PUCCH with the high priority index and the PUCCH or PUSCH with the low priority index overlap in time, d of the PUCCH with the high priority index 2 May be configured as a value reported by the UE. Otherwise, d 2 Is 0.
D when PDSCH mapping type B is used for UE processing capability 1 1,1 The value of (2) may be determined according to the number d of overlapping symbols between L, which is the number of symbols of the scheduled PDSCH and the PDCCH of the scheduled PDSCH, as follows.
When L is greater than or equal to 7, d 1,1 ＝0
-d when L.gtoreq.4 and L.gtoreq.6 1,1 ＝7-L
-d when l=3 1,1 ＝min(d,1)
-d when l=2 1,1 ＝3+d
When PDSCH mapping type B is used for UE processing capability 2, d 1,1 The value may be determined according to the number d of overlapping symbols between L, which is the number of symbols of the scheduled PDSCH and the PDCCH of the scheduled PDSCH, as follows.
When L is greater than or equal to 7, d 1,1 ＝0
-d when L.gtoreq.4 and L.gtoreq.6 1,1 ＝7-L
When l=2, d in case the PDCCH to be scheduled is present in a CORESET consisting of three symbols and the corresponding CORESET and the PDSCH to be scheduled have the same starting symbol 1,1 =3. Otherwise, d 1,1 ＝d。
For a UE supporting capability 2 in a given serving cell, PDSCH processing time according to UE processing capability 2 may be applied when the UE configures processing type2Enabled as higher layer signaling to be Enabled for that cell.
When the position of the first uplink transmission symbol of the PUCCH including HARQ-ACK information (the corresponding position may be regarded as K1, which is defined as the transmission time of HARQ-ACK, the PUCCH resource for HARQ-ACK transmission, and the effect of timing advance) is not more than at time T from the last symbol of PDSCH proc,1 After that goes outThe UE must transmit a valid HARQ-ACK message when the first uplink transmission symbol now starts early. That is, the UE should transmit the PUCCH including the HARQ-ACK only when the PDSCH processing time is sufficient. Otherwise, the UE cannot provide the base station with valid HARQ-ACK information corresponding to the scheduled PDSCH. T (T) proc,1 May be used for both normal and extended CP. When the PDSCH is composed of two PDSCH transmission positions in one slot, d is calculated based on the first PDSCH transmission position in the corresponding slot 1,1 . When equation 2 is described with reference to fig. 16, the minimum time interval between the first PDSCH 16800 and the second PDSCH 16810 should be T proc,1 。
The method 3-2 may be limitedly applied to a case in which an indication through a specific field of a DCI format is configured to dynamically determine whether multicast HARQ-ACK information is transmitted with an upper layer signal, and a case in which no transmission of corresponding HARQ-ACK information is indicated through a specific field of a DCI format. Alternatively, the method 3-2 may be applied only in a case where the reception-free multicast HARQ-ACK information transmission is configured as a higher layer signal. Alternatively, method 3-2 may be set by a separate higher layer signal. Alternatively, method 3-2 may be applied to UEs reporting specific UE capabilities in a limited manner.
Method 3-3 uses a reference value configured as a higher layer signal. According to the method, unlike the methods 3-1 and 3-2, the base station may configure a reference time for transmitting and receiving PDSCH with the same HARQ process number to the UE or a reference time for transmitting and receiving PDCCH including DCI for scheduling PDSCH in advance as a higher layer signal. Taking fig. 16 as an example, when the minimum time interval between the first PDSCH 1600 and the second PDSCH 1610 is b symbols, the corresponding value b is a value previously configured as a higher layer signal. Alternatively, the value b may correspond to at least one of the possible values reported by the UE capabilities prior to higher layer configuration.
Fig. 17 is a flowchart illustrating an operation procedure in which a base station performs scheduling in consideration of the same HARQ process according to an embodiment of the present disclosure.
Referring to fig. 17, in 1700, a base station transmits a first PDSCH corresponding to a first HARQ process number to a UE. Next, the base station considers at least one of methods 3-1 to 3-3 or a combination of at least one of methods 3-1 to 3-3 in order to determine a condition for scheduling another PDSCH corresponding to the first HARQ process number used in the first PDSCH. For example, after the first PDSCH transmission, according to at least one of methods 3-1 or methods 3-1 to 3-3 (although HARQ-ACK information is not actually received) receiving the last symbol of the resource of the actual HARQ-ACK information, the base station may be scheduled and transmitted to transmit a second PDSCH corresponding to the first HARQ process number or a PDCCH for scheduling the second PDSCH to the corresponding terminal after a time of receiving the preset virtual HARQ-ACK report in 1710. When the base station schedules the second PDSCH or the PDCCH for scheduling the second PDSCH to the corresponding terminal before the point of time, the UE may perform any operation by regarding it as an error condition, or the UE may not receive the second PDSCH or the PDCCH for scheduling the second PDSCH. Therefore, even if the base station transmits the second PDSCH or the PDCCH for scheduling the second PDSCH to the UE, it cannot predict which information of the UE has been received.
Although fig. 17 has been described from the operation point of view of the base station, it can be completely regarded as operation from the point of view of the UE. In 1700, the UE receives a first PDSCH corresponding to a first HARQ process number from a base station. Next, the UE considers at least one of methods 3-1 to 3-3 or a combination of at least one of methods 3-1 to 3-3 in order to determine a condition for scheduling another PDSCH corresponding to the first HARQ process number used in the first PDSCH. For example, after the first PDSCH transmission, the UE receives a second PDSCH corresponding to the first HARQ process number or a PDCCH for scheduling the second PDSCH from the corresponding base station after a time of receiving a preset virtual HARQ-ACK report according to a last symbol of a resource for receiving actual HARQ-ACK information according to at least one of methods 3-1 or methods 3-1 to 3-3 (although HARQ-ACK information is not actually received) (1710). When the base station transmits the second PDSCH or the PDCCH scheduling the second PDSCH to the UE between time points, the UE may be regarded as an error condition and may perform any operation based on the received second PDSCH or PDCCH or may not consider the received information. Alternatively, the UE may stop the reception operation of the first PDSCH and may not perform HARQ-ACK information transmission corresponding thereto.
Fig. 18 is a block diagram illustrating a structure of a UE capable of performing according to an embodiment of the present disclosure.
Referring to fig. 18, a UE of the present disclosure may include a terminal receiver 1800, a terminal transmitter 1804, and a terminal processor 1802. In an embodiment, the terminal receiver 1800 and the terminal transmitter 1804 may be collectively referred to as a transceiver. The transceiver may transmit signals to/receive signals from the base station. The signals may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal and an RF receiver for low noise amplifying and down-converting the received signal. In addition, the transceiver may receive signals through a wireless channel, output the received signals to the terminal processor 1802, and transmit signals output from the terminal processor 1802 through the wireless channel. The terminal processor 1802 may control a series of processes so that the UE may operate according to the above-described embodiments.
Fig. 19 is a block diagram illustrating a structure of a base station that can be performed according to an embodiment of the present disclosure.
Referring to fig. 19, in an embodiment, a base station may include at least one of a base station receiver 1901, a base station transmitter 1905, and a base station processor 1903. In embodiments of the present disclosure, the base station receiver 1901 and the base station transmitter 1905 may be collectively referred to as transceivers. The transceiver may transmit/receive signals to/from the UE. The signals may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal and an RF receiver for low noise amplifying and down-converting the received signal. In addition, the transceiver may receive signals through a wireless channel and output the received signals to the base station processor 1903, and transmit signals output from the terminal processor 1903 through the wireless channel. The base station processing unit 1903 may control a series of processes so that the base station may operate according to the above-described embodiments of the present disclosure.
In the drawings describing the methods of the present disclosure, the order of description does not always correspond to the order in which the steps of each method are performed, and the order relationship between the steps may be changed or the steps may be performed in parallel. Alternatively, in the drawings describing the method of the present disclosure, some elements may be omitted, and only some elements may be included therein, without departing from the true spirit and scope of the present disclosure.
Although the present disclosure mainly describes UE operation for SPS PDSCH, it may be applied sufficiently to apply equally to unlicensed PUSCH (or configured grant type 1 and type 2).
Further, in the methods of the present disclosure, some or all of the contents of each embodiment may be combined without departing from the true spirit and scope of the present disclosure.
The embodiments of the present disclosure described and illustrated in the specification and drawings are presented merely to facilitate explanation of the technical content of the present disclosure and to aid in understanding the present disclosure, and are not intended to limit the scope of the present disclosure. That is, other modifications and variations thereof may be made on the basis of the technical ideas of the present disclosure, which will be apparent to those skilled in the art. Furthermore, the respective embodiments described above may be used in combination, if necessary. For example, several embodiments of the present disclosure may operate a base station and a terminal in part in combination. Furthermore, although the above embodiments have been described based on an NR system, other variations of the technical ideas based on the embodiments may be implemented in other systems such as an FDD or Time Division Duplex (TDD) LTE system.
While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.
Claims (15)
1. A method performed by a terminal in a communication system, the method comprising:
receiving configuration information about a multicast semi-persistent scheduling, SPS, from a base station;
receiving a first SPS physical downlink shared channel, PDSCH, from the base station based on the configuration information and the first DCI upon receiving first downlink control information, DCI, from the base station for activating the SPS;
identifying hybrid automatic repeat request acknowledgement, HARQ-ACK, information corresponding to the first SPS PDSCH according to a first feedback scheme;
receiving a second SPS PDSCH from the base station; and
HARQ-ACK information corresponding to the second SPS PDSCH is identified according to a second feedback scheme.
2. The method of claim 1, further comprising:
receiving a second DCI for activating the SPS from the base station in a case that the DCI is not detected,
wherein the second DCI includes resource allocation information associated with resource allocation included in the first DCI.
3. The method of claim 1, further comprising:
receiving a third DCI for SPS release from the base station; and
and identifying HARQ-ACK information corresponding to the third DCI.
4. The method of claim 1, further comprising:
receiving a third SPS PDSCH associated with a HARQ process identifier from the base station; and
after a duration of reception of the data from the third SPS PDSCH, a fourth SPS PDSCH associated with the same HARQ process identifier is received from the base station.
5. A method performed by a base station in a communication system, the method comprising:
transmitting configuration information about a multicast semi-persistent scheduling SPS to a terminal;
transmitting first downlink control information, DCI, for activating the SPS to the terminal;
transmitting a first SPS physical downlink shared channel, PDSCH, corresponding to the configuration information and the first DCI to the terminal;
identifying whether hybrid automatic repeat request acknowledgement, HARQ-ACK, information corresponding to the first SPS PDSCH is received; and
a second SPS PDSCH is transmitted to a terminal upon receiving the HARQ-ACK information corresponding to the first SPS PDSCH.
6. The method of claim 5, further comprising:
In the case where the HARQ-ACK information corresponding to the first SPS PDSCH is not received, transmitting a second DCI for activating the SPS to the terminal,
wherein the second DCI includes resource allocation information associated with resource allocation included in the first DCI.
7. The method of claim 5, further comprising:
transmitting a third DCI for SPS release to the terminal; and
identifying whether HARQ-ACK information corresponding to the third DCI is received.
8. The method of claim 5, further comprising:
transmitting a third SPS PDSCH associated with the HARQ process identifier to the terminal; and
a fourth SPS PDSCH associated with the same HARQ process identifier is transmitted to the terminal after a duration of reception of the third SPS PDSCH.
9. A terminal in a communication system, the terminal comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
configuration information about a multicast semi-persistent scheduling SPS is received from a base station,
in case a first downlink control information, DCI, is received from the base station for activating the SPS, a first SPS physical downlink shared channel, PDSCH, is received from the base station based on the configuration information and the first DCI,
Hybrid automatic repeat request acknowledgement HARQ-ACK information corresponding to the first SPS PDSCH is identified according to a first feedback scheme,
receiving a second SPS PDSCH from the base station, an
HARQ-ACK information corresponding to the second SPS PDSCH is identified according to a second feedback scheme.
10. The terminal according to claim 9,
wherein the controller is further configured to:
receiving a second DCI for activating the SPS from the base station in the case that the DCI is not detected, and
wherein the second DCI includes resource allocation information associated with resource allocation included in the first DCI.
11. The terminal of claim 9, wherein the controller is further configured to:
receiving a third DCI for SPS release from the base station, and
and identifying HARQ-ACK information corresponding to the third DCI.
12. The terminal of claim 9, wherein the controller is further configured to:
receiving a third SPS PDSCH associated with a HARQ process identifier from the base station, an
A fourth SPS PDSCH associated with the same HARQ process identifier is received from the base station after a duration of reception of the packet from the third SPS PDSCH.
13. A base station in a communication system, the base station comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
transmitting configuration information about the multicast semi-persistent scheduling SPS to the terminal,
transmitting first downlink control information DCI for activating the SPS to the terminal,
transmitting a first SPS physical downlink shared channel PDSCH corresponding to the configuration information and the first DCI to the terminal,
identifying whether hybrid automatic repeat request acknowledgement, HARQ-ACK, information corresponding to the first SPS PDSCH is received, and
a second SPS PDSCH is transmitted to a terminal upon receiving the HARQ-ACK information corresponding to the first SPS PDSCH.
14. The base station of claim 13,
wherein the controller is further configured to:
transmitting a second DCI for activating the SPS to the terminal without receiving the HARQ-ACK information corresponding to the first SPS PDSCH, and
wherein the second DCI includes resource allocation information associated with resource allocation included in the first DCI.
15. The base station of claim 13, wherein the controller is further configured to:
Transmitting a third SPS PDSCH associated with the HARQ process identifier to the terminal, and
a fourth SPS PDSCH associated with the same HARQ process identifier is transmitted to the terminal after a duration of reception of the third SPS PDSCH.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2020-0135145 | 2020-10-19 | ||
| KR10-2021-0127967 | 2021-09-28 | ||
| KR1020210127967A KR20220051798A (en) | 2020-10-19 | 2021-09-28 | Method and apparatus for data transmission based on grant free in wireless communication system |
| PCT/KR2021/014551 WO2022086111A1 (en) | 2020-10-19 | 2021-10-19 | Method and apparatus for grant-free data transmission in wireless communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116491202A true CN116491202A (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180071083.1A Pending CN116491202A (en) | 2020-10-19 | 2021-10-19 | Method and apparatus for unlicensed data transmission in a wireless communication system |
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| Country | Link |
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| CN (1) | CN116491202A (en) |
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2021
- 2021-10-19 CN CN202180071083.1A patent/CN116491202A/en active Pending
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