CN116961859A

CN116961859A - Method and apparatus for uplink control information transmission in a wireless communication system

Info

Publication number: CN116961859A
Application number: CN202310462012.5A
Authority: CN
Inventors: 金亨泰; 姜智源; 高成源
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2022-04-27
Filing date: 2023-04-26
Publication date: 2023-10-27

Abstract

The present disclosure relates to methods and apparatus for uplink control information transmission in a wireless communication system. Methods and apparatus for uplink transmission in a wireless communication system are disclosed. A method performed by a terminal in a wireless communication system according to one embodiment of the present disclosure may include the steps of: receiving transmission reference information associated with a plurality of uplink channels from a network; and transmitting at least one uplink channel of the plurality of uplink channels in one time unit based on the transmission reference information.

Description

Method and apparatus for uplink control information transmission in a wireless communication system

Technical Field

The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for performing uplink transmission and reception in a wireless communication system.

Background

A mobile communication system has been developed to provide a voice service while guaranteeing mobility of a user. However, the mobile communication system has been extended to data traffic as well as voice traffic, and currently, explosive growth of traffic has resulted in resource shortage, and users have demanded faster services, and thus, more advanced mobile communication systems have been demanded.

The general need for the next generation mobile communication system should be able to support the accommodation of explosive data traffic, a significant increase in transmission rate per user, the accommodation of a significantly increased number of connected devices, very low end-to-end delay and energy efficiency. For this reason, various technologies such as dual connectivity, massive multiple input multiple output (massive MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), ultra wideband support, device networking, etc. have been studied.

Disclosure of Invention

Technical objects of the present disclosure are to provide a method and apparatus for performing uplink transmission in a wireless communication system.

An additional technical object of the present disclosure is to provide a method and apparatus for transmitting/discarding/multiplexing a plurality of physical control channels (e.g., PUCCHs) upon uplink transmission while supporting a terminal in a wireless communication system.

Technical objects to be achieved by the present disclosure are not limited to the above technical objects, and other technical objects not described herein will be apparent to those skilled in the art from the following description.

A method performed by a terminal in a wireless communication system according to an aspect of the present disclosure may include the steps of: receiving transmission reference information associated with a plurality of uplink channels from a network; and transmitting at least one uplink channel of the plurality of uplink channels in one time unit based on the transmission reference information. Wherein the transmission reference information may include at least one of a control resource set pool (CORESET pool), an uplink channel group, an uplink channel format, uplink content, or a transmission scheme. The transmission of the at least one of the plurality of uplink channels may be performed based on a first operation corresponding to simultaneous transmission of the plurality of uplink channels or a second operation corresponding to at least one of multiplexing or partial dropping for the plurality of uplink channels.

A method performed by a base station in a wireless communication system according to additional aspects of the present disclosure may include the steps of: transmitting transmission reference information related to a plurality of uplink channels to a terminal; and receiving at least one uplink channel of the plurality of uplink channels in one time unit based on the transmission reference information. Wherein the transmission reference information may include at least one of a control resource set pool (CORESET pool), an uplink channel group, an uplink channel format, uplink content, or a transmission scheme. The transmission of the at least one of the plurality of uplink channels may be performed based on a first operation corresponding to simultaneous transmission of the plurality of uplink channels or a second operation corresponding to at least one of multiplexing or partial dropping for the plurality of uplink channels.

According to embodiments of the present disclosure, methods and apparatuses for performing uplink transmission in a wireless communication system may be provided.

According to embodiments of the present disclosure, a method and apparatus for transmitting/dropping/multiplexing a plurality of physical control channels (e.g., PUCCHs) when uplink transmission while supporting a terminal in a wireless communication system may be provided.

The effects achievable by the present disclosure are not limited to the above-described effects, and other effects not described herein can be clearly understood by those skilled in the art from the following description.

Drawings

The accompanying drawings, which are included to provide a further understanding of the detailed description of the disclosure, provide embodiments of the disclosure and describe features of the disclosure through the detailed description.

Fig. 1 illustrates a structure of a wireless communication system to which the present disclosure can be applied.

Fig. 2 illustrates a frame structure in a wireless communication system to which the present disclosure may be applied.

Fig. 3 illustrates a resource grid in a wireless communication system to which the present disclosure may be applied.

Fig. 4 illustrates physical resource blocks in a wireless communication system to which the present disclosure may be applied.

Fig. 5 illustrates a slot structure in a wireless communication system to which the present disclosure may be applied.

Fig. 6 illustrates a physical channel used in a wireless communication system to which the present disclosure can be applied and general signal transmission and reception methods using the physical channel.

Fig. 7 illustrates a method of transmitting a plurality of TRPs in a wireless communication system to which the present disclosure may be applied.

Fig. 8 is a flowchart for describing an example of a method of uplink transmission by a terminal according to the present disclosure.

Fig. 9 is a diagram for describing an example of a method of receiving uplink transmissions by a base station according to the present disclosure.

Fig. 10 illustrates a block diagram of a wireless communication system according to one embodiment of the present disclosure.

Detailed Description

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description disclosed by the drawings is intended to describe exemplary embodiments of the disclosure and is not intended to represent the only embodiments in which the disclosure may be practiced. The following detailed description includes specific details to provide a thorough understanding of the present disclosure. However, it will be apparent to one skilled in the relevant art that the present disclosure may be practiced without these specific details.

In some cases, known structures and devices may be omitted or may be shown in block diagram form based on core functions of each structure and device in order to prevent ambiguity of the concepts of the present disclosure.

In this disclosure, when an element is referred to as being "connected," "combined," or "linked" to another element, it can comprise the indirect connection and the direct connection of yet another element therebetween. Furthermore, in the present disclosure, the terms "comprises" and/or "comprising" specify the presence of stated features, steps, operations, components, and/or elements, but do not preclude the presence or addition of one or more other features, stages, operations, components, elements, and/or groups thereof.

In this disclosure, terms such as "first," "second," and the like are used merely to distinguish one element from another element and are not intended to limit the order or importance between the elements unless otherwise indicated. Thus, within the scope of the present disclosure, a first element in an embodiment may be referred to as a second element in another embodiment, and as such, a second element in an embodiment may be referred to as a first element in another embodiment.

The terminology used in the present disclosure is for the purpose of describing particular embodiments, and is not intended to limit the claims. As used in the description of the embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "and/or" as used in this disclosure may refer to one of the relevant listed items or to any and all possible combinations of two or more of them. Furthermore, unless otherwise indicated, the words "/" and/or "between words in the present invention have the same meaning.

The present disclosure describes a wireless communication network or wireless communication system, and operations performed in the wireless communication network may be performed in a process in which a device (e.g., a base station) controlling the corresponding wireless communication network controls the network and transmits or receives signals, or may be performed in a process in which signals are transmitted or received between a terminal associated with the corresponding wireless network and the network or terminal

In the present disclosure, a transmission or reception channel includes a meaning of transmitting or receiving information or signals through a corresponding channel. For example, transmitting a control channel means transmitting control information or a control signal through the control channel. Similarly, transmitting a data channel means transmitting data information or a data signal through the data channel.

Hereinafter, downlink (DL) means communication from a base station to a terminal, and Uplink (UL) means communication from a terminal to a base station. In the downlink, the transmitter may be part of a base station and the receiver may be part of a terminal. In the uplink, the transmitter may be part of a terminal and the receiver may be part of a base station. The base station may be expressed as a first communication device and the terminal may be expressed as a second communication device. A Base Station (BS) may be replaced with terms such as a fixed station, a node B, eNB (evolved node B), a gNB (next generation node B), a BTS (base transceiver system), an Access Point (AP), a network (5G network), an AI (artificial intelligence) system/module, an RSU (road side unit), a robot, an unmanned aerial vehicle (UAV: unmanned aerial vehicle), an AR (augmented reality) device, a VR (virtual reality) device, and the like. In addition, the terminal may be fixed or mobile, and may be replaced with terms of UE (user equipment), MS (mobile station), UT (user terminal), MSs (mobile subscriber station), SS (subscriber station), AMS (advanced mobile station), WT (wireless terminal), MTC (machine type communication) device, M2M (machine to machine) device, D2D (device to device) device, vehicle, RSU (roadside unit), robot, AI (artificial intelligence) module, unmanned aerial vehicle (UAV: unmanned aerial vehicle), AR (augmented reality) device, VR (virtual reality) device, or the like.

The following description may be used for various radio access systems, such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA may be implemented by e.g. UTRA (universal terrestrial radio access) or CDMA 2000. TDMA may be implemented by radio technologies such as GSM (global system for mobile communications)/GPRS (general packet radio service)/EDGE (data rate enhanced GSM evolution). OFDMA may be implemented by radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA), and the like. UTRA is part of UMTS (universal mobile telecommunications system). The 3GPP (third Generation partnership project) LTE (Long term evolution) is a part of E-UMTS (evolved UMTS) that uses E-UTRA, and LTE-A (advanced)/LTE-Apro is a release-advanced version of 3GPP LTE. The 3GPP NR (New radio or New radio Access technology) is an advanced release of 3GPP LTE/LTE-A/LTE-Apro.

For the sake of clarity of description, description is made based on a 3GPP communication system (e.g., LTE-A, NR), but the technical ideas of the present disclosure are not limited thereto. LTE means technology after 3GPP TS (technical specification) 36.Xxx release 8. Specifically, the LTE technology in or after 3gpp TS 36.Xxx release is referred to as LTE-a, and the LTE technology in or after 3gpp TS 36.Xxx release 13 is referred to as LTE-a pro.3GPP NR means technology in or after TS 38.Xxx release. LTE/NR may be referred to as a 3GPP system. "xxx" means the detailed number of a standard file. LTE/NR may be generally referred to as a 3GPP system. For background art, terms, abbreviations, etc. used to describe the present disclosure, reference may be made to matters described in the standard documents disclosed before the present disclosure. For example, the following documents may be referred to.

For 3GPP LTE, reference may be made to TS 36.211 (physical channel and modulation), TS 36.212 (multiplexing and channel coding), TS 36.213 (physical layer procedure), TS 36.300 (general description), TS 36.331 (radio resource control).

For 3GPP NR, reference may be made to TS 38.211 (physical channel and modulation), TS 38.212 (multiplexing and channel coding), TS 38.213 (physical layer procedure for control), TS 38.214 (physical layer procedure for data), TS 38.300 (NR and NG-RAN (new generation radio access network) overall description), TS 38.331 (radio resource control protocol specification).

Abbreviations for terms that may be used in the present disclosure are defined as follows.

-BM: beam management

-CQI: channel quality indicator

-CRI: channel state information-reference signal resource indicator

-CSI: channel state information

CSI-IM: channel state information-interference measurement

-CSI-RS: channel state information-reference signal

-DMRS: demodulation reference signal

-FDM: frequency division multiplexing

-FFT: fast fourier transform

IFDMA: interleaved frequency division multiple access

-IFFT: inverse fast fourier transform

-L1-RSRP: layer 1 reference signal received power

-L1-RSRQ: layer 1 reference signal reception quality

-MAC: media access control

-NZP: non-zero power

-OFDM: orthogonal frequency division multiplexing

PDCCH: physical downlink control channel

PDSCH: physical downlink shared channel

-PMI: precoding matrix indicator

-RE: resource elements

RI: rank indicator

-RRC: radio resource control

-RSSI: received signal strength indicator

-Rx: reception of

-QCL: quasi co-placement

SINR: signal to interference noise ratio

SSB (or SS/PBCH block): synchronization signal block (including PSS (primary synchronization signal), SSS (secondary synchronization signal) and PBCH (physical broadcast channel))

-TDM: time division multiplexing

-TRP: transmitting and receiving points

-TRS: tracking reference signals

-Tx: transmitting

-UE: user equipment

-ZP: zero power

Integrated system

As more communication devices require higher capacity, a need has arisen for improved mobile broadband communications compared to existing Radio Access Technologies (RATs). In addition, large-scale MTC (machine type communication) that provides various services anytime and anywhere by connecting a plurality of devices and things is also one of the main problems to be considered for next-generation communication. In addition, communication system designs that consider reliability and latency sensitive services/terminals are discussed. Thus, the introduction of next generation RATs considering eMBB (enhanced mobile broadband communication), emtc (large scale MTC), URLLC (ultra reliable low latency communication), etc. is discussed, and for convenience, the corresponding technology is referred to as NR in this disclosure. NR is an expression representing an example of a 5G RAT.

A new RAT system including NR uses an OFDM transmission method or a transmission method similar thereto. The new RAT system may follow different OFDM parameters than those of LTE. Alternatively, the new RAT system follows the parameters of the existing LTE/LTE-a as it is, but may support a wider system bandwidth (e.g., 100 MHz). Alternatively, one cell may support multiple parameter sets. In other words, terminals operating according to different parameter sets may coexist in one cell.

The parameter set corresponds to one subcarrier spacing in the frequency domain. As the reference subcarrier spacing is scaled by an integer N, different parameter sets may be defined.

Referring to fig. 1, NG-RAN is configured with a gNB providing a control plane (RRC) protocol side for NG-RA (NG radio access) user plane (i.e., new AS (access layer) sublayer/PDCP (packet data convergence protocol)/RLC (radio link control)/MAC/PHY) and UE. The gNB is interconnected by an Xn interface. Furthermore, the gNB is connected to the NGC (new generation core) through an NG interface. More specifically, the gNB is connected to an AMF (access and mobility management power) through an N2 interface, and to a UPF (user plane function) through an N3 interface.

The NR system can support multiple parameter sets. Here, the parameter set may be defined by a subcarrier spacing and a Cyclic Prefix (CP) overhead. Here, the plurality of subcarrier spacings may be derived by scaling the basic (reference) subcarrier spacing by an integer N (or μ). Furthermore, although it is assumed that a very low subcarrier spacing is not used in a very high carrier frequency, the parameter set used may be selected independently of the frequency band. Further, various frame structures according to a plurality of parameter sets may be supported in the NR system.

Hereinafter, OFDM parameter sets and frame structures that can be considered in an NR system will be described. The plurality of OFDM parameter sets supported in the NR system may be defined as table 1 below.

TABLE 1

μ	Δf＝2 ^μ ·15[kHz]	CP
			0	15	Normal state
1	30	Normal state
			2	60	Normal, extended
3	120	Normal state
			4	240	Normal state

The NR supports a plurality of parameter sets (or subcarrier spacing (SCS)) for supporting various 5G services. For example, when SCS is 15kHz, supporting wide area of traditional cellular band; and when SCS is 30kHz/60kHz, supporting dense city, lower time delay and wider carrier bandwidth; and when SCS is 60kHz or higher, bandwidths exceeding 24.25GHz are supported to overcome phase noise.

The NR frequency band is defined as the frequency range of both types (FR 1, FR 2). FR1 and FR2 can be configured as shown in table 2 below. In addition, FR2 may mean millimeter wave (mmW).

TABLE 2

Regarding the frame structure in the NR system, the sizes of various fields in the time domain are expressed as T _c ＝1/(Δf _max ·N _f ) Is a multiple of the time unit of (a). Here, Δf _max 480.10 ³ Hz, and N _f 4096. Downlink and uplink transmissions are configured (organized) to have a duration T _f ＝1/Δf _max N _f /100)T _c Radio frame of 10 ms. Here, the radio frame is configured with 10 subframes each having T _sf ＝(Δf _max N _f /1000)·T _c Time duration of=1 ms. In this case, there may be one frame set for the uplink and one frame set for the downlink. Furthermore, the transmission in the ith uplink frame from the terminal should start earlier by T than the corresponding downlink frame in the corresponding terminal _TA ＝(N _TA +N _TA,offset )T _c Starting. For subcarrier spacing configuration μ, slots are allocated in subframes in n _s ^μ ∈{0,...,N _slot ^subframe,μ -1} and in radio frame in n _s,f ^μ ∈{0,...,N _slot ^frame,μ -increasing order number of 1. One time slot is configured with N _symb ^slot Successive OFDM symbols, and N _symb ^slot Is determined according to the CP. Time slot n in subframe _s ^μ Is started with OFDM symbol n in the same subframe _s ^μ N _symb ^slot Is arranged in time. All terminals may not perform transmission and reception simultaneously, which means that downlink or uplink time slots may not be available Is a symbol of the OFDM symbol.

Table 3 shows the number of OFDM symbols (N _symb ^slot ) Number of slots per radio frame (N _slot ^frame,μ ) And the number of slots per subframe (N _slot ^subframe,μ ) And table 4 shows the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

TABLE 3

μ	N _symb ^slot	N _slot ^frame,μ	N _slot ^subframe,μ
				0	14	10	1
1	14	20	2
				2	14	40	4
3	14	80	8
				4	14	160	16

TABLE 4

μ	N _symb ^slot	N _slot ^frame,μ	N _slot ^subframe,μ
				2	12	40	4

Fig. 2 is an example of μ=2 (SCS is 60 kHz), and referring to table 3,1 subframe may include 4 slots. 1 subframe = {1,2,4} as shown in fig. 2 is an example, and the number of slots that can be included in 1 subframe is defined as in table 3 or table 4. In addition, the mini-slot may include 2,4, or 7 symbols or more or less.

Regarding physical resources in the NR system, antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc. may be considered. Hereinafter, physical resources that can be considered in the NR system will be described in detail.

First, with respect to antenna ports, antenna ports are defined such that channels carrying symbols in an antenna port can be inferred from channels carrying other symbols in the same antenna port. When the massive nature of the channel in which the symbols in one antenna port are carried can be inferred from the channel carrying the symbols of another antenna port, it can be said that 2 antenna ports are in a QC/QCL (quasi co-located or quasi co-located) relationship. In this case, the large-scale property includes at least one of delay spread, doppler spread, frequency shift, average received power, and reception timing.

Referring to fig. 3, a resource grid configured with N in the frequency domain is illustratively depicted _RB ^μ N _sc ^RB Subcarriers, and one subframe is configured with 14.2 ^μ OFDM symbols, but is not limited thereto. In NR system, the transmitted signal is represented by 2 ^μ N _symb ^(μ) Each OFDM symbol is configured with N _RB ^μ N _sc ^RB One or more resource grids of subcarriers. Here, N _RB ^μ ≤N _RB ^max,μ 。N _RB ^max,μ Represents the maximum transmission bandwidth, which may differ between uplink and downlink and between parameter sets. In this case, one resource grid may be configured per mu and antenna port p. Each element of the resource grid for μ and antenna port p is called a resource element and is uniquely identified by an index pair (k, l'). Here, k=0,.. _RB ^μ N _sc ^RB -1 is an index in the frequency domain, and l' =0, & 2 ^μ N _symb ^(μ) -1 refers to the symbol position in the subframe. When referencing a resource element in a slot, an index pair (k, l) is used. Here, l=0,.. _symb ^μ -1. The resource elements (k, l') for μ and antenna port p correspond to complex values a _k,l' ^(p,μ) . When there is no risk of confusion or when not indicatedWhen determining a particular antenna port or parameter set, the indices p and μmay be discarded, and the complex values may be ak, l '(p) or ak, l'. Further, a Resource Block (RB) is defined as N in the frequency domain _sc ^RB =12 consecutive subcarriers.

Point a functions as a common reference point for the resource block grid and is obtained as follows.

-the offsettopointea of the primary cell (PCell) downlink represents the frequency offset between point a and the lowest subcarrier of the lowest resource block overlapping with the SS/PBCH block used by the terminal for initial cell selection. It is assumed that a subcarrier spacing of 15kHz is used for FR1 and a subcarrier spacing of 60kHz is used for FR2, which is expressed in units of resource blocks.

The absoltateFrequencyPointA indicates the frequency location of Point A, expressed in ARFCN (absolute radio frequency channel number).

For a subcarrier spacing configuration μ, the common resource blocks are numbered from 0 up in the frequency domain. The center of subcarrier 0 of common resource block 0 for subcarrier spacing configuration μ is the same as "point a". Common resource block number n of subcarrier spacing configuration μ in the frequency domain _CRB ^μ The relation between the resource element (k, l) is given as the following equation 1.

[ 1]

In equation 1, k is defined with respect to point a such that k=0 corresponds to a subcarrier centered on point a. Physical resource blocks from 0 to N in bandwidth part (BWP) _BWP,i ^size,μ -1 number and i is the number of BWP. Physical resource block n in BWPi _PRB And common resource block n _CRB The relationship between them is given by the following equation 2.

[ 2]

N _BWP,i ^start,μ Is BWP versus common resourceCommon resource block beginning with block 0.

Fig. 4 illustrates physical resource blocks in a wireless communication system to which the present disclosure may be applied. Also, fig. 5 illustrates a slot structure in a wireless communication system to which the present disclosure can be applied.

Referring to fig. 4 and 5, a slot includes a plurality of symbols in the time domain. For example, for a normal CP,1 slot includes 7 symbols, but for an extended CP,1 slot includes 6 symbols

The carrier comprises a plurality of subcarriers in the frequency domain. An RB (resource block) is defined to be a plurality (e.g., 12) of consecutive subcarriers in the frequency domain. BWP (bandwidth part) is defined as a plurality of consecutive (physical) resource blocks in the frequency domain and may correspond to one parameter set (e.g., SCS, CP length, etc.). The carrier may include a maximum of N (e.g., 5) BWPs. Data communication may be performed through the activated BWP, and only one BWP may be activated for one terminal. In a resource grid, each element is referred to as a Resource Element (RE) and may map one complex symbol.

In an NR system, each Component Carrier (CC) may support up to 400MHz. If a terminal operating in such a wideband CC is always operated to turn on a radio Frequency (FR) chip for the entire CC, terminal battery consumption may increase. Alternatively, when considering a plurality of application cases operating in one wideband CC (e.g., eMBB, URLLC, mmtc, V2X, etc.), different parameter sets (e.g., subcarrier spacing, etc.) may be supported in each of the frequency bands in the corresponding CC. Alternatively, each terminal may have different capabilities for maximum bandwidth. In view of this, the base station may instruct the terminal to operate in only a partial bandwidth, not in the full bandwidth of the wideband CC, and for convenience, the corresponding partial bandwidth is defined as a bandwidth part (BWP). BWP may be configured with consecutive RBs on the frequency axis and may correspond to one parameter set (e.g., subcarrier spacing, CP length, slot/mini-slot duration).

Further, the base station may configure a plurality of BWP even in one CC configured for the terminal. For example, BWP occupying a relatively small frequency domain may be configured in a PDCCH monitoring slot, and PDSCH indicated by PDCCH may be scheduled in a larger BWP. Alternatively, when the UE is congested in a specific BWP, some terminals may be configured with other BWPs for load balancing. Alternatively, some full-bandwidth intermediate spectrum may be excluded in consideration of frequency domain inter-cell interference cancellation between neighboring cells, etc., and BWP on both edges may be configured in the same slot. In other words, the base station may configure at least one DL/UL BWP to a terminal associated with the wideband CC. The base station may activate at least one DL/UL BWP of the configured DL/UL BWP at a specific time (through L1 signaling or MAC CE (control element) or RRC signaling, etc.). Further, the base station may instruct (through L1 signaling or MAC CE or RRC signaling, etc.) to switch to other configured DL/UL BWP. Alternatively, based on the timer, when the timer value expires, it may be switched to the determined DL/UL BWP. Here, the activated DL/UL BWP is defined as an active DL/UL BWP. However, when the terminal performs an initial access procedure or sets up an RRC connection, configuration on DL/UL BWP may not be received, and thus the DL/UL BWP assumed by the terminal in these cases is defined as an initially active DL/UL BWP.

In a wireless communication system, a terminal receives information from a base station through a downlink and transmits information to the base station through an uplink. The information transmitted and received by the base station and the terminal includes data and various control information, and there are various physical channels according to the type/purpose of the information they transmit and receive.

When the terminal is turned on or newly enters a cell, it performs an initial cell search including synchronization with a base station, etc. (S601). For initial cell search, a terminal may synchronize with a base station by receiving a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) from the base station and obtain information such as a cell Identifier (ID). The terminal may then acquire broadcast information in the cell by receiving a Physical Broadcast Channel (PBCH) from the base station. In addition, the terminal may check a downlink channel state by receiving a downlink reference signal (DLRS) in an initial cell search phase.

The terminal that completed the initial cell search may obtain more detailed system information by receiving a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) according to information carried in the PDCCH (S602).

Further, when the terminal accesses the base station for the first time or does not have radio resources for signal transmission, it may perform a Random Access (RACH) procedure on the base station (S603 to S606). For the random access procedure, the terminal may transmit a specific sequence as a preamble through a Physical Random Access Channel (PRACH) (S603 and S605), and may receive a response message to the preamble through a PDCCH and a corresponding PDSCH (S604 and S606)). The contention-based RACH may additionally perform a contention resolution procedure.

The terminal that then performs the above procedure may perform PDCCH/PDSCH reception (S607) and PUSCH (physical uplink shared channel)/PUCCH (physical uplink control channel) transmission (S608) as a general uplink/downlink signal transmission procedure. Specifically, the terminal receives Downlink Control Information (DCI) through the PDCCH. Here, the DCI includes control information such as resource allocation information for a terminal, and a format varies according to its purpose of use.

Further, the control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station includes downlink/uplink ACK/NACK (acknowledgement/non-acknowledgement) signals, CQI (channel order indicator), PMI (precoding matrix indicator), RI (rank indicator), and the like. For the 3GPP LTE system, the terminal can transmit the control information of CQI/PMI/RI and the like through PUSCH and/or PUCCH.

Table 5 shows an example of DCI formats in an NR system.

TABLE 5

Referring to table 5, DCI formats 0_0, 0_1, and 0_2 may include resource information (e.g., UL/SUL (supplemental UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), information related to a Transport Block (TB) (e.g., MCS (modulation coding and scheme), NDI (new data indicator), RV (redundancy version), etc.), information related to HARQ (hybrid-automatic repeat and request) (e.g., procedure number, DAI (downlink assignment index), PDSCH-HARQ feedback timing, etc.), information related to multiple antennas (e.g., DMRS sequence initialization information, antenna port, CSI request, etc.), power control information related to scheduling of PUSCH (e.g., PUSCH power control, etc.), and control information included in each DCI format may be predefined.

DCI format 0_0 is used to schedule PUSCH in one cell. The information included in the DCI format 0_0 is CRC (cyclic redundancy check) scrambled by a C-RNTI (cell radio network temporary identifier) or CS-RNTI (configured scheduling RNTI) or MCS-C-RNTI (modulation coding scheme cell RNTI) and is transmitted.

DCI format 0_1 is used to indicate scheduling of one or more PUSCHs or Configuring Grant (CG) downlink feedback information to terminals in one cell. The information included in the DCI format 0_1 is scrambled by a C-RNTI or CS-RNTI or SP-CSI-RNTI (semi-persistent CSI RNTI) or MCS-C-RNTI and transmitted.

DCI format 0_2 is used to schedule PUSCH in one cell. The information included in the DCI format 0_2 is scrambled by a C-RNTI or CS-RNTI or SP-CSI-RNTI or MCS-C-RNTI and transmitted.

Next, DCI formats 1_0, 1_1, and 1_2 may include resource information (e.g., frequency resource allocation, time resource allocation, VRB (virtual resource block) -PRB (physical resource block) mapping, etc.), information related to a Transport Block (TB) (e.g., MCS, NDI, RV, etc.), information related to HARQ (e.g., a process number, DAI, PDSCH-HARQ feedback timing, etc.), information related to multiple antennas (e.g., antenna ports, TCI (transmission configuration indicator), SRS (sounding reference signal) request, etc.), information related to a PUCCH related to scheduling of PDSCH (e.g., PUCCH power control, PUCCH resource indicator, etc.), and control information included in each DCI format may be predefined.

DCI format 1_0 is used to schedule PDSCH in one DL cell. The information included in the DCI format 1_0 is a CRC scrambled and transmitted by a C-RNTI or CS-RNTI or MCS-C-RNTI.

DCI format 1_1 is used to schedule PDSCH in one cell. The information included in the DCI format 1_1 is a CRC scrambled and transmitted by a C-RNTI or CS-RNTI or MCS-C-RNTI.

DCI format 1_2 is used to schedule PDSCH in one cell. The information contained in DCI format 1_2 is a CRC scrambled and transmitted by C-RNTI or CS-RNTI or MCS-C-RNTI.

Operation related to multiple TRP

A coordinated multipoint (CoMP) scheme refers to a scheme in which a plurality of base stations effectively control interference by exchanging (e.g., using an X2 interface) or using channel information (e.g., RI/CQI/PMI/LI (layer indicator), etc.) fed back by a terminal and cooperatively transmitted to the terminal. CoMP can be classified into Joint Transmission (JT), coordinated Scheduling (CS), coordinated Beamforming (CB), dynamic Point Selection (DPS), dynamic Point Blocking (DPB), and the like according to the scheme used.

The M-TRP transmission scheme in which M TRPs transmit data to one terminal can be largely classified as i) an emmbb M-TRP transmission, which is a scheme for increasing a transmission rate, and ii) a URLLC M-TRP transmission, which is a scheme for increasing a reception success rate and reducing a delay.

In addition, regarding DCI transmission, M-TRP transmission schemes may be classified into i) M-TRP transmission of M-DCI (a plurality of DCIs) transmitting different DCIs based on each TRP and ii) M-TRP transmission of S-DCI (a single DCI) transmitting DCIs based on one TRP. For example, for M-TRP transmission based on S-DCI, all scheduling information about data transmitted by M TRPs should be delivered to a terminal through one DCI, which can be used in an environment where dynamic cooperation between two TRPs is an ideal backhaul (ideal BH) possible.

For TDM-based URLLC M-TRP transmission, scheme 3/4 is under discussion for standardization. In particular, scheme 4 means a scheme in which one TRP transmits a Transport Block (TB) in one slot, and it has an effect of improving probability of data reception by the same TB received from a plurality of TRPs in a plurality of slots. Further, scheme 3 means a scheme in which one TRP transmits TBs through a consecutive number of OFDM symbols (i.e., symbol groups), and the TRP may be configured to transmit the same TBs through different symbol groups in one slot.

In addition, the UE may identify PUSCH (or PUCCH) scheduled by DCI received in different control resource sets (CORESETs) (or CORESETs belonging to different CORESETs) as PUSCH (or PUCCH) transmitted to different TRPs, or may identify PDSCH (or PDCCH) from different TRPs. In addition, the method for UL transmission (e.g., PUSCH/PUCCH) transmitted to different TRPs described below may be equally applied to UL transmission (e.g., PUSCH/PUCCH) transmitted to different panels belonging to the same TRP.

Hereinafter, non-coherent joint transmission (NCJT) based on a plurality of DCIs/NCJT based on a single DCI will be described.

NCJT (incoherent joint transmission) is a scheme in which a plurality of Transmission Points (TPs) transmit data to one terminal by using the same time-frequency resource, and the TPs transmit data by using different DMRS (demodulation multiplexing reference signals) through different layers (i.e., through different DMRS ports) between the TPs.

The TP transmits data scheduling information to the terminal receiving the NCJT through DCI. Here, a scheme in which each TP participating in the NCJT transmits scheduling information on data itself transmitted through DCI is referred to as "NCJT based on a plurality of DCIs". When each of N TPs participating in NCJT transmission transmits DL grant DCI and PDSCH to the UE, the UE receives N DCI and N PDSCH from the N TPs. In addition, a scheme in which one representative TP transmits scheduling information over one DCI on data transmitted by itself and data transmitted by different TPs (i.e., TPs participating in NCJT) is referred to as "NCJT based on a single DCI". Here, N TPs transmit one PDSCH, but each TP transmits only some of the layers included in one PDSCH. For example, when transmitting 4 layers of data, TP1 may transmit 2 layers and TP2 may transmit 2 remaining layers to the UE.

The plurality of TRP (MTRP) performing NCJT transmission may transmit DL data to the terminal by using either one of the following two schemes.

First, a "single DCI based MTRP scheme" is described. MTRP cooperatively transmits one common PDSCH, and each TRP involved in the cooperative transmission is spatially divided and transmits the corresponding PDSCH to different layers (i.e., different DMRS ports) by using the same time-frequency resources. Here, scheduling information on PDSCH is indicated to the UE through one DCI, and which DMRS (group) port uses which QCL RS and QCL type information is indicated by a corresponding DCI (which is different from the indicated QCL RS indicated in the existing scheme and the DCI of the type to be commonly applied to all DMRS ports). In other words, M TCI states (e.g., m=2 for 2TRP cooperative transmission) may be indicated by a TCI (transmission configuration indicator) field in the DCI, and QCL RS and types may be indicated by using M different TCI states for the M DMRS port group. In addition, DMRS port information may be indicated by using a new DMRS table.

Next, "MTRP scheme based on a plurality of DCIs" is described. Each MTRP transmits different DCI and PDSCH, and (part or all) the corresponding PDSCH overlaps each other and is transmitted in frequency-time resources. The corresponding PDSCH may be scrambled by different scrambling IDs (identifiers) and the DCI may be transmitted through coreets belonging to different coreet groups. (where the CORESET may be identified by an index defined in the CORESET configuration of each CORESET, for example, when index=0 is configured for CORESET1 and CORESET2 and index=1 is configured for CORESET3 and CORESET4, CORESET1 and CORESET3 and CORESET4 belong to CORESET 1. Additionally, when no index is defined in CORESET, it may be interpreted as index=0) when multiple scrambling IDs are configured in one serving cell or two or more CORESET groups are configured, the UE may notice that it receives data according to MTRP operations based on multiple DCIs.

Alternatively, whether the MTRP scheme based on a single DCI or the MTRP scheme based on a plurality of DCIs may be indicated to the UE through separate signaling. In an example, for one serving cell, multiple CRS (cell reference signal) patterns for MTRP operation may be indicated to the UE. In this case, PDSCH rate matching (ratemating) for CRS may be different depending on a single DCI-based MTRP scheme or multiple DCI-based MTRP schemes (because CRS patterns are different).

Hereinafter, the CORESET ID described/mentioned in the present disclosure may represent index/identification information (e.g., ID, etc.) of CORESET for distinguishing each TRP/panel (panel). In addition, the CORESET group may be a group/combination set of coreets distinguished by index/identification information (e.g., ID)/CORESET group ID or the like for distinguishing coreets of each TRP/panel. In an example, the CORESET group ID may be specific index information defined in the CORESET configuration. In this case, the CORESET may be configured/indicated/defined by an index defined in the CORESET configuration of each CORESET. Additionally/alternatively, the CORESET group ID may represent index/identification information/indicator, etc. for distinguishing/identifying between coreets configured/associated with each TRP/panel. In the following, the CORESET group IDs described/mentioned in the present disclosure may be represented by being replaced with specific index/specific identification information/specific indicator for distinguishing/identifying between CORESETs configured/associated with each TRP/panel. CORESET group IDs (i.e., specific indices/specific identification information/specific indicators for distinguishing/identifying between coreets configured/associated with each TRP/panel) may be configured/indicated to the terminal by higher layer signaling (e.g., RRC signaling)/L2 signaling (e.g., MAC-CE)/L1 signaling (e.g., DCI), etc. In an example, it may be configured/indicated such that PDCCH detection will be performed for each TRP/panel in a cell of the corresponding CORESET group (i.e. for TRP/panels belonging to the same CORESET group). Additionally/alternatively, it may be configured/indicated such that uplink control information (e.g., CSI, HARQ-a/N (ACK/NACK), SR (scheduling request)) and/or uplink physical channel resources (e.g., PUCCH/PRACH/SRs resources) are separated and managed/controlled for each TRP/panel in the cells of the corresponding CORESET group (i.e., for TRP/panels belonging to the same CORESET group). Additionally/alternatively, harq a/N (processing/retransmission) or the like for PDSCH/PUSCH or the like scheduled for each TRP/panel may be managed for the corresponding CORESET group (i.e., for TRP/panels belonging to the same CORESET group).

Hereinafter, partially overlapping NCJTs will be described.

In addition, NCJTs may be classified into fully overlapped NCJTs where time-frequency resources transmitted by each TP are fully overlapped and partially overlapped NCJTs where only some of the time-frequency resources are overlapped. In other words, for partially overlapping NCJTs, data for both TP1 and TP2 are transmitted in some time-frequency resources, and data for only one of TP1 or TP2 is transmitted in the remaining time-frequency resources.

Hereinafter, a method for improving reliability in the multi-TRP will be described.

As a transmission and reception method for improving reliability using transmission among a plurality of TRPs, the following two methods can be considered.

Fig. 7 illustrates a method of multiple TRP transmissions in a wireless communication system to which the present disclosure may be applied.

Referring to fig. 7 (a), a case where groups of layers transmitting the same Codeword (CW)/Transport Block (TB) correspond to different TRPs is shown. Here, a layer group may mean a predetermined set of layers including one or more layers. In this case, there is an advantage in that since the number of layers increases, the amount of transmission resources increases, and thus robust channel coding with a low coding rate can be used for TBs, and in addition, since a plurality of TRPs have different channels, it can be expected to improve the reliability of a received signal based on diversity gain.

Referring to (b) of fig. 7, an example of transmitting different CWs through groups of layers corresponding to different TRPs is shown. Here, it can be assumed that TBs corresponding to cw#1 and cw#2 in the drawing are identical to each other. In other words, cw#1 and cw#2 mean that the same TB is respectively transformed into different CWs by different TRPs through channel coding or the like. Thus, an example of repeatedly transmitting the same TB may be considered. In the case of (b) of fig. 7, there may be a disadvantage in that a code rate corresponding to TB is higher as compared with (a) of fig. 7. However, it has the advantage that: the code rate may be adjusted by indicating different RV (redundancy version) values or the modulation order of each CW may be adjusted for coded bits generated from the same TB according to the channel environment.

According to the methods shown in fig. 7 (a) and 7 (b) above, since the same TB is repeatedly transmitted through different groups of layers and each group of layers is transmitted by a different TRP/panel, the data reception probability of the terminal can be improved. It is called an SDM (space division multiplexing) -based M-TRP URLLC transmission method. Layers belonging to different layer groups are respectively transmitted through DMRS ports belonging to different DMRS CDM groups.

In addition, the above-described content related to a plurality of TRPs is described based on an SDM (space division multiplexing) method using different layers, but it can naturally be extended and applied to an FDM (frequency division multiplexing) method based on different frequency domain resources (e.g., RB/PRB (set) and the like) and/or a TDM (time division multiplexing) method based on different time domain resources (e.g., slots, symbols, sub-symbols and the like).

Regarding a method for multiple TRP-based URLLC scheduled by a single DCI, the following method is discussed.

1) Method 1 (SDM): the time and frequency resource allocations overlap and n (n < = Ns) TCI states in a single slot

1-a) method 1a

Transmitting the same TB in one layer or set of layers at each transmission time (occasion), and each layer or each set of layers is associated with one TCI and one DMRS port set.

-using a single codeword with one RV in all spatial layers or all layer sets. Regarding the UE, different coded bits are mapped to different layers or layer sets by using the same mapping rule.

1-b) method 1b

-using a single codeword with one RV in each spatial layer or each layer set. The RV corresponding to each spatial layer or each layer set may be the same or different.

1-c) method 1c

-transmitting the same TB with one DMRS port associated with multiple TCI state indexes in one layer or transmitting the same TB with multiple DMRS ports one-to-one associated with multiple TCI state indexes in one layer at one transmission time (occasion).

In the case of methods 1a and 1c, the same MCS is applied to all layers or all layer sets.

2) Method 2 (FDM): the frequency resource allocations do not overlap and n (n < = Nf) TCI states in a single slot

Each non-overlapping frequency resource allocation is associated with a TCI state.

The same DMRS port/s is/are associated with all non-overlapping frequency resource allocations.

2-a) method 2a

A single codeword with one RV is used for all resource allocations. With respect to UEs, common RB matching (codeword to layer mapping) is applied to all resource allocations.

2-b) method 2b

A single codeword with one RV is used for each non-overlapping frequency resource allocation. The RV corresponding to each non-overlapping frequency resource allocation may be the same or different.

For method 2a, the same MCS is applied to all non-overlapping frequency resource allocations.

3) Method 3 (TDM): the time resource allocations do not overlap and n (n < = Nt 1) TCI states in a single slot

Each transmission time (occasion) of a TB has a time granularity of mini-slots and has one TCI and one RV.

All transmit time (occasion) common MCS in a slot are used with a single or multiple DMRS ports.

The RV/TCI may be the same or different at different transmission times (occasions).

4) Method 4 (TDM): n (n < =n2) TCI states in K (n < =k2) different time slots

Each transmission time (occasion) of a TB has one TCI and one RV.

-using a common MCS and single or multiple DMRS ports across each transmit time (occasion) of K slots.

Hereinafter, MTRP URLLC is described.

In the present disclosure, DL MTRP URLLC means that a plurality of TRPs transmit the same data (e.g., the same TB)/DCI by using different layers/time/frequency resources. For example, TRP 1 transmits the same data/DCI in resource 1 and TRP 2 transmits the same data/DCI in resource 2. The UE configured with the DL MTRP-URLLC transmission method receives the same data/DCI by using different layers/time/frequency resources. Here, the UE configures from the base station which QCL RS/type (i.e., DL TCI state) should be used in layer/time/frequency resources receiving the same data/DCI. For example, when the same data/DCI is received in resource 1 and resource 2, the DL TCI state used in resource 1 and the DL TCI state used in resource 2 may be configured. The UE may achieve high reliability because it receives the same data/DCI over resource 1 and resource 2. Such DL MTRP URLLC may be applied to PDSCH/PDCCH.

Further, in the present disclosure, UL MTRP-URLLC means that a plurality of TRPs receive the same data/UCI (uplink control information) from any UE by using different layer/time/frequency resources. For example, TRP 1 receives the same data/DCI from the UE in resource 1 and TRP 2 receives the same data/DCI from the UE in resource 2 to share the received data/DCI through the backhaul links connected between the TRPs. UEs configured with the UL MTRP-URLLC transmission method transmit the same data/UCI by using different layers/time/frequency resources. In this case, the UE configures from the base station which Tx beam and which Tx power (i.e., UL TCI state) should be used in the layer/time/frequency resource transmitting the same data/DCI. For example, when the same data/UCI is transmitted in resource 1 and resource 2, the UL TCI state used in resource 1 and the UL TCI state used in resource 2 may be configured. Such UL MTRP URLLC may be applied to PUSCH/PUCCH.

In addition, in the present disclosure, when a specific TCI state (or TCI) is used (or mapped) in receiving data/DCI/UCI for any frequency/time/space resource (layer), it means the following. For DL, it may mean that a channel is estimated from the DMRS by using QCL type and QCL RS indicated by a corresponding TCI state in the frequency/time/space resource (layer), and data/DCI is received/demodulated based on the estimated channel. In addition, for UL, it may mean transmitting/modulating DMRS and data/UCI by using Tx beams and power indicated by the corresponding TCI state in the frequency/time/space resource.

Here, the UL TCI state has Tx beam and/or Tx power information of the UE, and spatial relationship information or the like may be configured to the UE through other parameters instead of the TCI state. The UL TCI status may be directly indicated by the UL grant DCI or may represent spatial relationship information of SRS resources indicated by an SRI (sounding resource indicator) field of the UL grant DCI. Alternatively, it may mean an Open Loop (OL) Tx power control parameter (e.g., j: an index of an open loop parameter Po and α (up to 32 parameter value sets per cell), q_d: an index of DLRS resources for PL (path loss) measurements (up to 4 measurements per cell), l: a closed loop power control procedure index (up to 2 procedures per cell) connected to a value indicated by an SRI field of UL grant DCI.

Hereinafter, MTRP eMBB is described.

In this disclosure, MTRP-eMBB means that a plurality of TRPs transmit different data (e.g., different TBs) by using different layers/times/frequencies. The UE configured with the MTRP-eMBB transmission method receives indications on a plurality of TCI states through DCI and assumes that data received through QCL RSs using each TCI state is different data.

On the other hand, the UE can understand whether the MTRP URLLC or the MTRP eMBB is transmitted/received by dividing the RNTI for the MTRP-URLLC and the RNTI for the MTRP-eMBB, respectively, and using them. In other words, the UE considers DCI as URLLC transmission when performing CRC masking by using RNTI for URLLC, and considers DCI as embbc transmission when performing CRC masking by using RNTI for embbc. Alternatively, the base station may configure MTRP URLLC transmission/reception or TRP eMBB transmission/reception to the UE through other new signaling.

In the description of the present disclosure, for convenience of description, description is made by assuming cooperative transmission/reception between two TRPs, but the method proposed in the present disclosure can also be extended and applied in 3 or more multi-TRP environments, and in addition, it can also be extended and applied in a multi-panel environment (i.e., by matching TRPs with panels). In addition, different TRPs may be identified as different TCI states for the UE. Thus, when the UE receives/transmits data/DCI/UCI by using TCI state 1, it means receiving data/DCI/UCI from/transmitting data/DCI/UCI to TRP 1.

Hereinafter, the method proposed in the present disclosure may be utilized in a case where MTRP cooperatively transmits PDCCHs (repeatedly transmitting or partially transmitting the same PDCCH). In addition, the method proposed in the present disclosure may also be utilized in the case where MTRP cooperatively transmits PDSCH or cooperatively receives PUSCH/PUCCH.

In addition, in the present disclosure, when a plurality of base stations (i.e., MTRP) repeatedly transmit the same PDCCH, it may mean that the same DCI is transmitted through a plurality of PDCCH candidates, and also it may mean that a plurality of base stations repeatedly transmit the same DCI. Here, the same DCI may mean two DCIs having the same DCI format/size/payload. Alternatively, although two DCIs have different payloads, they may be considered to be the same DCI when the scheduling result is the same. For example, a TDRA (time domain resource allocation) field of DCI relatively determines a slot/symbol position of data and a slot/symbol position of a/N (ACK/NACK) based on a reception occasion of DCI, such that if DCI received at N occasion and DCI received at n+1 occasion inform UE of the same scheduling result, the TDRA fields of the two DCIs are different, and necessarily, DCI payloads are different. R (number of repetitions) may be indicated directly by the base station or mutually promised to the UE. Alternatively, although the payloads of two DCIs are different and the scheduling results are different, when the scheduling result of one DCI is a subset of the scheduling results of the other DCI, it may be considered as the same DCI. For example, when the same data is repeatedly transmitted N times through TDM, DCI 1 received before the first data indicates N data repetitions, and DCI 2 received after the first data and before the second data indicates N-1 data repetitions. The scheduling data of DCI 2 becomes a subset of the scheduling data of DCI 1, and both DCIs schedule the same data, so in this case it can be regarded as the same DCI.

In addition, in the present disclosure, when a plurality of base stations (i.e., MTRP) partially transmit the same PDCCH, it means that one DCI is transmitted through one PDCCH candidate, but TRP 1 transmits some resources such that such PDCCH candidate is defined and TRP 2 transmits the remaining resources. For example, when the PDCCH candidates corresponding to the aggregation level m1+m2 are transmitted divided by TRP 1 and TRP 2, the PDCCH candidates may be divided into PDCCH candidate 1 corresponding to the aggregation level m1 and PDCCH candidate 2 corresponding to the aggregation level m2, and TRP 1 may transmit PDCCH candidate 1 and TRP 2 may transmit PDCCH candidate 2 to different time/frequency resources. After receiving PDCCH candidate 1 and PDCCH candidate 2, the UE may generate a PDCCH candidate corresponding to an aggregation level m1+m2 and attempt DCI decoding.

In addition, in the present disclosure, when the UE repeatedly transmits the same PUSCH such that a plurality of base stations (i.e., MTRP) can receive the same PUSCH, it may mean that the UE transmits the same data through the plurality of PUSCHs. In this case, each PUSCH may be optimized and transmitted to UL channels of different TRPs. For example, when the UE repeatedly transmits the same data through PUSCH 1 and PUSCH 2, PUSCH 1 is transmitted by using UL TCI state 1 for TRP 1, and in this case, link adaptation such as precoder/MCS and the like may also be scheduled/applied to a value optimized for the channel of TRP 1. PUSCH 2 is transmitted by using UL TCI state 2 for TRP 2, and link adaptation such as precoder/MCS may also be scheduled/applied to the values optimized for the channel of TRP 2. In this case, the PUSCH 1 and PUSCH 2 that are repeatedly transmitted may be transmitted at different times for TDM, FDM, or SDM.

In addition, in the present disclosure, when the UE partially transmits the same PUSCH such that a plurality of base stations (i.e., MTRP) can receive the PUSCH, it may mean that the UE transmits one data through one PUSCH, but it divides resources allocated to the PUSCH, optimizes them for UL channels of different TRPs, and transmits them. For example, when the UE transmits the same data through the 10-symbol PUSCH, the data is transmitted by using UL TCI state 1 for TRP 1 in 5 previous symbols, and in this case, link adaptation such as precoder/MCS and the like may also be scheduled/applied to a value optimized for the channel of TRP 1. The remaining data is transmitted in the remaining 5 symbols by using UL TCI state 2 for TRP 2, and in this case, link adaptation such as precoder/MCS may also be scheduled/applied to the channel-optimized values for TRP 2. In an example, the transmission for TRP 1 and the transmission for TRP 2 are TDM by dividing one PUSCH into time resources, but may be transmitted by the FDM/SDM method.

In addition, similar to the PUSCH transmission described above, the UE may repeatedly transmit the same PUCCH or may partially transmit the same PUCCH, as well as for PUCCH, so that a plurality of base stations (i.e., MTRP) receive it.

Hereinafter, the proposal of the present disclosure may be extended and applied to various channels such as PUSCH/PUCCH/PDSCH/PDCCH and the like.

The proposal of the present disclosure can be extended and applied to a case where various uplink/downlink channels are repeatedly transmitted to different time/frequency/space resources and a case where various uplink/downlink channels are partially transmitted to different time/frequency/space resources.

In the present disclosure, a Transmission Opportunity (TO) may correspond TO a resource unit of a transmission/reception channel or a candidate resource unit of a transmission/reception channel. For example, when multiple channels are transmitted in a TDM scheme, a TO may refer TO each channel transmitted in a different time resource or may be transmitted in a different time resource. For example, when multiple channels are transmitted in accordance with an FDM scheme, TO may refer TO each channel transmitted in a different frequency resource (e.g., RB) or may be transmitted in a different frequency resource (e.g., RB). For example, when multiple channels are transmitted in accordance with an SDM scheme, TO may refer TO each channel transmitted in a different layer/beam/DMRS port or may be transmitted in a different layer/beam/DMRS port. One TCI state may be mapped TO each TO. When the same channel is repeatedly transmitted, the complete DCI/data/UCI may be transmitted at one TO, and the receiving end may receive a plurality of TO increase the reception success rate.

The above-described multi-TB PUSCH/PDSCH scheduling scheme based on a single DCI (S-DCI) may be applied, for example, to the case where one DCI schedules a plurality of PUSCH/PDSCH simultaneously in a very high frequency band (e.g., a frequency band higher than 5.26 GHz). For example, a plurality of Time Domain Resource Allocations (TDRA) (or TO) may be indicated at a time through a TDRA field of DCI for scheduling PUSCH, and a different TB may be transmitted through PUSCH in each TO. The Frequency Domain Resource Allocation (FDRA), MCS, transmission Precoding Matrix Indicator (TPMI), SRI value of the multi-TB PUSCH scheduling DCI may be commonly applied to a plurality of TBs scheduled by the corresponding DCI. In addition, NDI, RV may be indicated separately/independently for each TB through a multi-TB PUSCH scheduling DCI. In addition, in such a multi-TB PUSCH of scheduling DCI, one value is indicated for HARQ (process) number (HPN), but values sequentially increasing from initial TO in order of TO may be applied.

In addition, an M-TRP PUSCH repetition transmission scheme based on S-DCI may be considered. In this regard, the base station configures two SRS sets to the terminal for S-DCI based M-TRP PUSCH transmission, and each set is used to indicate UL Tx ports for/to TRP 1 and TRP 2 and UL beam/QCL information. In addition, the base station performs SRS resource indication for each SRS resource set, and may indicate up to two PC parameter sets through two SRI fields included in one DCI.

For example, the first SRI field may indicate the SRS resources and PC parameter set defined in SRS resource set 0, and the second SRI field may indicate the SRS resources and PC parameter set defined in SRS resource set 1. The terminal may receive an indication of UL Tx port, PC parameter set, and UL beam/QCL information for TRP 1 through the first SRI field, through which the terminal performs PUSCH transmission at a TO corresponding TO SRS resource set 0. Similarly, the terminal may receive an indication of UL Tx port, PC parameter set, and UL beam/QCL information for TRP 2 through the second SRI field, through which the terminal may perform PUSCH transmission at the TO corresponding TO SRS resource set 1.

In addition to the SRI field described above, an existing one field may be extended to two fields such that TPMI, PTRS, and TPC related fields may be indicated for each TRP.

In addition, an SRS resource set indication field (e.g., a 2-bit field) may be defined, and based thereon, the terminal may perform S-TRP PUSCH retransmission by selecting a specific one of the two SRS resource sets, or may perform M-TRP PUSCH retransmission by selecting both of the two SRS resource sets.

For example, a code point "00" of the SRS resource set indication field may indicate a first SRS resource set and a code point "01" may indicate a second SRS resource set/definition. When the code point "00" or "01" is indicated, S-TRP PUSCH transmission corresponding to the SRS resource set indicated by each code point may be performed. In addition, code point "10" may be configured/defined to indicate [ first SRS resource set, second SRS resource set ], and code point "11" may be configured/defined to indicate [ second SRS resource set, first SRS resource set ]. When the code point "10" or "11" is indicated, M-TRP PUSCH transmission may be performed in the order in which SRS resource set pairs are indicated. The first SRS resource set corresponds TO the first PUSCH TO when the code point "10" is indicated, and the second SRS resource set corresponds TO the first PUSCH TO when the code point "11" is indicated.

In addition, an M-TRP repetition PUCCH transmission scheme based on a single PUCCH resource may be considered. In this regard, for M-TRP PUCCH transmission based on a single PUCCH resource, the base station may activate/configure two spatial relationship information (if FR1, two PC parameter sets may be activated/configured) to the terminal on the single PUCCH resource. Each spatial relationship information is used to indicate spatial relationship information about TRP 1 and TRP 2, respectively, to a terminal when UL UCI is transmitted through a corresponding PUCCH resource. For example, a Tx beam/PC parameter with respect TO TRP 1 is indicated TO the terminal by a value indicated in the first spatial relationship information, and the terminal performs PUCCH transmission at TO corresponding TO TRP 1 by using the corresponding information. Similarly, the Tx beam/PC parameter with respect TO TRP 2 is indicated TO the terminal by the value indicated in the second spatial relationship information, and the terminal performs PUCCH transmission at TO corresponding TO TRP 2 by using the corresponding information.

In addition, for M-TRP PUCCH repetition transmission, a configuration method has been improved so that two spatial relationship information can be configured in PUCCH resources. That is, when Power Control (PC) parameters such as PLRS, alpha, P0 and closed-loop index are set/configured for each spatial relationship information, the spatial relationship RS may be configured. Accordingly, PC information and spatial relationship RS information corresponding to two TRPs can be configured by two spatial relationship information. By doing so, the terminal transmits UCI (i.e., CSI, ACK/NACK, SR, etc.) PUCCH by using the first spatial relationship information at the first TO, and transmits the same UCI PUCCH by using the second spatial relationship information at the second TO. In the present disclosure, PUCCH resources configured with two spatial relationship information may be referred to as M-TRP PUCCH resources, and PUCCH resources configured with one spatial relationship information may be referred to as S-TRP PUCCH resources.

In addition, regarding the proposals of the present disclosure, a unified TCI framework scheme may be considered. That is, the UL TCI state and the DL TCI state may be indicated together by DL DCI (e.g., DCI format 1_1/1_2, etc.). Alternatively, only the UL TCI state may be indicated and the DL TCI state is not indicated through the DL DCI. By doing so, the scheme conventionally used for UL beam and Power Control (PC) configuration can be replaced by the UL TCI status indication scheme described above.

As a specific example, one UL TCI state may be indicated by a TCI field in DL DCI. In this case, the UL TCI state may be applied to all PUSCHs/PUCCHs after a specific time (e.g., beam application time), and may be applied to some or all of the indicated SRS resource sets. Alternatively, multiple UL TCI states (and/or DL TCI states) may be indicated by a TCI field in the DL DCI.

Method for transmitting physical control channel considering simultaneous transmission related to multiple transmission elements/multiple transmission targets

New methods of simultaneously transmitting a plurality of Channels (CH)/Reference Signals (RS) of the same type and simultaneously transmitting a plurality of CH/RSs of different types by a terminal are being discussed. In the conventional scheme, the operation in which the terminal transmits a plurality of CH/RSs at one point of time (or within one time unit) is restricted. For example, for a terminal according to the conventional scheme, simultaneous transmission of a plurality of SRS resources belonging to different SRS resource sets is supported for uplink beam measurement, but simultaneous transmission of a plurality of different PUSCHs is not supported. Accordingly, in order to support more advanced terminal operation by alleviating the above-described limitations, a method of simultaneously transmitting a plurality of CH/RSs using a plurality of transmission elements of one terminal is being discussed.

For example, according to the present disclosure, a terminal may simultaneously perform uplink transmission for a plurality of transmission targets using a plurality of transmission elements. In addition, the base station may simultaneously receive uplink transmissions sent through the plurality of transmission elements from terminals in the plurality of transmission targets. For example, the transmission element of the terminal may correspond to an antenna group or antenna panel, and one antenna group/panel may correspond to one RS set (or one RS candidate set). That is, the antenna group/panel may be indicated/identified by an RS (candidate) set, e.g., a transmission target of an uplink transmission from a terminal may correspond to a TRP or cell, and one TRP/cell may correspond to one CORESET/pool. That is, TRP/cells may be indicated/identified by CORESET groups/pools. For example, a simultaneous uplink transmission scheme for multiple transmission targets by multiple transmission elements may be referred to as a cross multi-panel (STxMP) simultaneous transmission. However, the scope of the present disclosure is not limited by the name of the transmission scheme, examples of units of the transmission element, and/or examples of units of the transmission target.

As one example of STxMP operation, two PUSCHs corresponding to two UL TBs (e.g., a first PUSCH carrying a first TB, a second PUSCH carrying a second TB) may be scheduled on the same RB. In addition, a separate TCI state may be configured/indicated for each of the plurality of PUSCH transmissions. The plurality of TCI states may correspond to a plurality of transmission elements (e.g., panel/RS sets), respectively. In addition, one transmission element may correspond to one transmission target, respectively, and a plurality of transmission elements may correspond to one transmission target.

For example, a first spatial relationship RS and a first Power Control (PC) parameter set (or first UL TCI state) may be configured/indicated for a first PUSCH transmission, and a second spatial relationship RS and a second PC parameter set (or second UL TCI state) may be configured/indicated for a second PUSCH transmission. For example, a terminal may transmit a first PUSCH in a first time unit using a first panel corresponding to a first UL TCI state, and may transmit a second PUSCH in a first time unit using a second panel corresponding to a second UL TCI state. For example, the terminal may transmit a first PUSCH over a first set of RSs (for a first CORESET pool) based on a first UL TCI state in a first time unit, and may transmit a second PUSCH over a second set of RSs (for a second CORESET pool) based on a second UL TCI in the first time unit. The time units may correspond to at least one of symbols, groups of symbols, slots, or groups of slots.

In this regard, when PUSCH scheduling is performed through DCI, the base station may indicate whether or not to transmit the corresponding PUSCH through STxMP, a single panel, or M-TRP repetition PUSCH. In this case, the terminal needs to have STxMP-related capability, and needs to enable the STxMP mode in advance through higher layer signaling (e.g., RRC signaling, etc.). For this indication, the existing SRS resource set indication field may be redefined and used, or a new DCI field may be introduced/defined.

For example, in the case of M-DCI based M-TRP operation with multiple CORESET pools in a wireless communication system, a PUCCH (e.g., first PUCCH, PUCCH 0) linked to a first CORESET pool (e.g., CORESET pool 0) and a PUCCH (e.g., second PUCCH, PUCCH 1) linked to a second CORESET pool (e.g., CORESET pool 1) may not be scheduled to overlap simultaneously and may be Time Division Multiplexed (TDM).

In contrast, in case of collision between PUCCHs linked to the same CORESET pool or collision between PUCCH/PUSCH, it may be multiplexed with one channel or some channels may be dropped according to existing collision handling rules.

However, a terminal having STXMP-based transmission capability as described above (i.e., an enhanced terminal) can simultaneously transmit a plurality of PUCCHs, which have collided, through a plurality of transmission elements (e.g., panels) without multiplexing/dropping. In addition, a network (e.g., a base station) may schedule PUCCHs linked to different CORESET pools for corresponding terminals simultaneously without TDM-based scheduling, and the corresponding terminals may transmit PUCCHs linked to each CORESET pool according to an STxMP scheme.

The present disclosure proposes a method of determining under what conditions (existing) multiplexing/dropping is applied and under what conditions simultaneous transmission (e.g., STxMP-based transmission) is performed when a plurality of PUCCHs are scheduled to have overlap for STxMP-based transmission enabled terminals.

Fig. 8 is a diagram for explaining an example of an uplink transmission method of a terminal according to the present disclosure.

The terminal may receive transmission reference information related to a plurality of uplink channels from the network at step S810.

Here, the transmission reference information may include at least one of a control resource set pool (core pool), an uplink channel group, an uplink channel format, uplink content, or a transmission scheme.

In step S820, the terminal may transmit at least one uplink channel of the plurality of uplink channels to the network based on the transmission reference information (in one time unit).

In this regard, the transmission of at least one of the plurality of uplink channels may be performed based on at least one of: i) A first operation corresponding to simultaneous transmission of a plurality of uplink channels, or ii) a second operation corresponding to at least one of multiplexing or partial dropping for the plurality of uplink channels. For example, the first operation may correspond to the STxMP-based transmission described above, and the second operation may correspond to an operation according to the (existing) conflict resolution rule described above.

For example, when a plurality of uplink channels are associated with different CORESET pools, transmission of at least one of the plurality of uplink channels may be performed in accordance with a first operation. On the other hand, when a plurality of uplink channels are associated with the same core pool, transmission of at least one of the plurality of uplink channels may be performed according to the second operation.

For example, when a plurality of uplink channels are associated with different uplink channel groups, transmission of at least one of the plurality of uplink channels may be performed according to a first operation. On the other hand, when a plurality of uplink channels are associated with the same uplink channel group, transmission of at least one of the plurality of uplink channels may be performed according to the second operation.

For example, whether to perform transmission of at least one of the plurality of uplink channels according to the first operation may be determined based on at least one of an uplink channel format, uplink content, or transmission scheme of the plurality of uplink channels.

For example, when the number of the plurality of uplink channels exceeds the number of simultaneous transmissions possible by the terminal, the number of uplink channels capable of simultaneous transmissions may be transmitted according to the first operation. In this regard, the number of uplink channels capable of simultaneous transmission may be respectively associated with different reference signal candidate sets. Additionally or alternatively, the number of uplink channels capable of simultaneous transmission may be determined based on at least one of an index of a CORESET pool, an index of an uplink channel group, or an index of a resource.

For example, whether the first operation or the second operation is applied to at least one of the plurality of uplink channels may be determined based on a number of uplink transmission configuration indicators (UL TCIs) configured for each of the plurality of uplink channels.

For example, the terminal may receive indication information from the network regarding an application of the first operation or the second operation related to transmission of at least one of the plurality of uplink channels. In this case, the terminal may perform uplink channel transmission by applying the first operation/the second operation according to the corresponding indication information.

For example, the uplink content may correspond to at least one of HARQ-ACK (hybrid automatic repeat request-acknowledgement) information, a scheduling request, or Channel State Information (CSI). Additionally or alternatively, transmission schemes may be distinguished/classified based on whether or not the uplink channel is repeated.

Fig. 9 is a diagram for explaining an example of an uplink reception method of a base station according to the present disclosure.

The base station may transmit transmission reference information related to a plurality of uplink channels to the terminal at step S910.

In step S920, the base station may receive at least one uplink channel of a plurality of uplink channels from the terminal based on the transmission reference information (in one time unit).

Since specific examples of the transmission reference information, the first operation (i.e., simultaneous transmission), and the second operation (i.e., multiplexing/partial discarding) are the same as those described in fig. 8, duplicate descriptions are omitted.

In the examples of fig. 8 and 9, the relevant capability information is reported (in advance) from the terminal to the network for each of a plurality of transmission elements (e.g., a plurality of antenna panels, a plurality of RS sets, a plurality of RS candidate sets, etc.). The base station may refer to capability information of the terminal and may configure/indicate transmission parameters related to a transmission target (e.g., CORESET pool, CORESET group, TRP) and/or a transmission element (e.g., antenna panel, RS set, RS candidate set, etc.) to the terminal.

Hereinafter, in the present disclosure, when a plurality of physical control channels are scheduled to have overlap for a terminal supporting simultaneous transmission, a detailed method of transmitting/discarding/multiplexing the physical control channels by the terminal will be described through various embodiments.

In the present disclosure, the scope of the present disclosure is not limited to this example, taking the case where a unified TCI indication scheme configures/indicates two UL TCI states, configures two spatial relationship information/RSs and PC sets through an existing UL M-TRP transmission method, and uses two transmission elements (e.g., panels) as an example. That is, the proposal of the present disclosure can be extended and applied even when the unified TCI indication scheme configures/indicates more than two (e.g., N1) UL TCI states, when more than two (e.g., N2) sets of spatial relationship information/RS and PC are configured/indicated, and when more than two transmission elements are used.

Hereinafter, the proposal of the present disclosure has been described as a representative example of PUCCH, but may be extended and applied to other channels such as PUSCH/PDSCH/PDCCH.

In addition, for clarity of the following description, although a representative example of a panel as a transmission element of a terminal is assumed and described, and a representative example of a CORESET pool as a transmission target of a terminal is assumed and described, the scope of the present disclosure is not limited to this example.

The embodiments described below are distinguished for clarity of explanation, and each embodiment may be applied independently, or part/all of the configuration of one embodiment may be combined/alternatively applied with some of the overall configuration of another embodiment.

Embodiment 1

When two PUCCHs where collision occurs are linked to different CORESET pools, the terminal transmits the corresponding PUCCH method according to the STxMP method, otherwise, it may be considered to apply the existing collision handling rule.

For example, two TRPs corresponding to two CORESET pools have a large backhaul delay (e.g., a delay of tens of ms or more that may not be dynamically coordinated) and scheduling is performed independently of each other.

In view of this, it may not be desirable to multiplex PUCCHs linked to different CORESET pools. This is because a delay occurs when a multiplexed PUCCH received by one TRP is transmitted to another TRP due to a backhaul delay.

In addition, it may not be desirable to discard PUCCHs linked to different CORESET claim pools. This is because it is difficult for the TRP to receive the discarded PUCCH to identify whether the corresponding PUCCH has been discarded, because it may not identify the PUCCH scheduling state of other TRPs.

Thus, when two PUCCHs are linked to different CORESET pools, it may be desirable for a terminal to transmit the corresponding PUCCHs according to the STxMP scheme. On the other hand, when two PUCCHs are linked to the same CORESET pool (or considered to be the same CORESET pool when there is no CORESET pool configuration), the terminal may follow existing collision handling rules.

In addition, in the case where the CORESET pool is extended to three or more, if PUCCH resources belonging to/connected to each of the first CORESET pool (e.g., CORESET pool 0), the second CORESET pool (e.g., CORESET pool 1), and the third CORESET pool (e.g., CORESET pool 2) are conflicting, the terminal may perform STxMP-based transmission by selecting two PUCCH resources from among the three PUCCH resources.

In this regard, since a terminal supporting two panels can transmit two PUCCHs according to the STxMP scheme, one PUCCH resource needs to be discarded. In this case, the terminal may perform STxMP-based transmission by selecting two PUCCHs having low indexes based on CORESET pool index/PUCCH resource index and discarding PUCCHs having high indexes.

This approach may not be effective if the two PUCCHs selected as described above are associated with the same panel (i.e., are configured to be transmitted using the same panel). Therefore, in this case, the differentiated PUCCHs associated with different panels need to be prioritized. Thereafter, it may be desirable for the terminal to select PUCCH within the PUCCH associated with the first panel based on the CORESET pool index/PUCCH resource index and to select PUCCH within the PUCCH associated with the second panel based on the CORESET pool index/PUCCH resource index. The corresponding method can also be used in example 2 to be described later.

In addition, STxMP-based transmission of two PUCCHs with different CORESET pools may not always be possible. For example, the following terminals may be considered: since the channel state between the TRP panel (hereinafter abbreviated as first terminal) and the terminal incapable of STxMP (hereinafter abbreviated as second terminal), the terminal is capable of STxMP but preferably/performs communication with both TRPs through the same panel.

In the case of the second terminal, as UE capabilities, the corresponding terminal may report to the base station whether STxMP transmissions are available in different CORESET pools, in particular, the terminal may distinguish and report whether STxMP is available in the same CORESET pool and whether STxMP is available between different CORESET pools. In the case of the first terminal, the corresponding terminal may need a terminal report as to whether STxMP is available between different CORESET pools. The report may be composed/configured of MAC-CE or dynamic UCI reporting and MAC-CE based reporting may be desirable in view of the reporting having event-based reporting characteristics.

Embodiment 2

When two PUCCHs where collision occurs are linked to different PUCCH groups, the terminal transmits a method of the corresponding PUCCH according to the STxMP method, otherwise, it may be considered to apply the existing collision handling rule.

In this regard, a terminal may be configured with up to four PUCCH groups, and one or more PUCCH resources may be configured for each PUCCH group. The base station can reduce signaling overhead by updating beam/Power Control (PC) set/spatial relationship RSs of PUCCHs belonging to the same PUCCH group at a time.

For example, PUCCH resources of a first TRP may be configured as a first PUCCH group, PUCCH resources of a second TRP may be configured as a second PUCCH group, and then PUCCHs of each TRP may be grouped and used. In this case, the beam/Power Control (PC) set/spatial relationship information/spatial relationship RS for each group may be updated at a time. By doing so, the base station can generally manage PUCCHs belonging to/bonded to the same PUCCH group, and separately/individually manage PUCCHs existing in different PUCCH groups.

In view of the characteristics of the PUCCH groups described above, it may be desirable to apply (existing) collision handling rules to PUCCHs of the same group, and to perform STxMP-based transmission for PUCCHs of different groups.

When PUCCH resources belonging to each of the first, second, and third PUCCH groups collide, the terminal selects two PUCCH resources from among the three PUCCH resources to perform STxMP-based transmission.

In this regard, since a terminal supporting two panels can transmit two PUCCHs according to the STxMP scheme, one PUCCH resource needs to be discarded. In this case, the terminal may perform STxMP-based transmission by selecting two PUCCHs having low indexes based on the PUCCH group index/PUCCH resource index and discarding PUCCHs having high indexes.

This approach may not be effective if the two PUCCHs selected as described above are associated with the same panel (i.e., configured to be transmitted using the same panel). Therefore, in this case, as in embodiment 1 described above, it is necessary to prioritize the PUCCH distinction associated with different panels. Thereafter, it may be desirable for the terminal to select a PUCCH within the PUCCH associated with each panel based on the PUCCH group index/PUCCH resource index.

Embodiment 3

The following method can be considered: when a link between a PUCCH group and a CORESET pool is configured/established, an existing collision handling rule is applied between PUCCH groups linked to the same CORESET pool, and STxMP-based transmission is performed between PUCCH groups linked to different CORESET pools.

For example, a first PUCCH group and a second PUCCH group may be linked to a first CORESET pool (e.g., CORESET pool 0), and a third PUCCH group and a fourth PUCCH group may be linked to a second CORESET pool (e.g., CORESET pool 1). In this case, for a collision between PUCCHs belonging to the first PUCCH group and the second PUCCH group or between PUCCHs belonging to the third PUCCH group and the fourth PUCCH group, an existing collision handling rule may be applied. On the other hand, when there is a collision between PUCCHs belonging to PUCCH groups (e.g., a first PUCCH group and a third PUCCH group) linked to different CORESET pools, the terminal may transmit the corresponding PUCCHs according to the STxMP scheme.

Embodiment 4

The following method can be considered: the STxMP-based transmission is restricted from being performed for collisions between specific PUCCH formats or from being performed for collisions between specific UCI contents.

For example, information on PUCCH formats that enable STxMP-based transmission may be individually indicated to the terminal by the base station, or may be previously agreed/defined between the base station and the terminal. When the corresponding PUCCH collides, the terminal may transmit the corresponding PUCCH according to the STxMP scheme.

Alternatively, STxMP-based transmission may be performed only between the same PUCCH formats, or conversely, STxMP-based transmission may be restricted to be performed only between different PUCCH formats.

For example, PUCCH format 3 and PUCCH format 4 are similar in DMRS pattern/UCI coding scheme and the like, and PUCCH format 0, PUCCH format 1, and PUCCH format 2 may generate signals in a completely different manner from PUCCH format 3 and PUCCH format 4. In addition, signals may be generated in a completely different manner between PUCCH format 0, PUCCH format 1 and PUCCH format 2. Accordingly, as described above, STxMP-based transmission may be performed for signals having similar signal generation schemes, and STxMP-based transmission may not be performed between different schemes.

Alternatively, whether to perform STxMP-based transmission may be determined according to whether the collided PUCCH is a long PUCCH (e.g., PUCCH format 1/3/4) or a short PUCCH (e.g., PUCCH format 0/2).

For example, in a collision between long PUCCHs or between short PUCCHs, simultaneous transmission (i.e., STxMP-based transmission) is possible, and in a collision between long PUCCH and short PUCCH, simultaneous transmission may not be possible.

According to the proposal of the present disclosure, when a collision occurs between PUCCHs that do not perform STxMP transmission, a terminal can discard/multiplex PUCCHs according to existing collision handling rules.

Additionally or alternatively, UCI content (e.g., ACK/NACK, SR, periodic (P) -CSI, semi-persistent (SP) -CSI, aperiodic (AP) -CSI, etc.) capable of STxMP-based transmission may be configured by a base station or pre-agreed/defined between the base station and a terminal. When the PUCCH collision corresponding to UCI is included, the terminal may transmit the corresponding PUCCH according to the STxMP scheme. Alternatively, the terminal may perform STxMP-based transmission only between the same UCI contents or, conversely, perform STxMP-based transmission only between different UCI contents.

Embodiment 5

In the above-described embodiments of the present disclosure (e.g., embodiment 1 to embodiment 4), it has been described that one UL TCI (or spatial relationship information/RS and/or PC set) is assumed to be configured in PUCCH resources.

Thus, when a collision between two PUCCHs occurs, a terminal supporting two panels can perform STxMP-based transmission by applying UL TCI (i.e., UL TCI state) of each PUCCH. On the other hand, the base station may configure two UL TCIs for one PUCCH, and the terminal may use the corresponding PUCCH for STxMP-based transmission. That is, the terminal may transmit one PUCCH through a first panel corresponding to a first UL TCI and simultaneously transmit the same PUCCH through a second panel corresponding to a second UL TCI.

For clarity of the following description, as described above, the PUCCH configured with two UL TCIs is referred to as PUCCH a, and the PUCCH configured with one UL TCI is referred to as PUCCH B.

The transmission of PUCCH a/PUCCH B may be performed according to at least one of the following methods (option 5-1 to option 5-4).

(option 5-1)

When a collision occurs between PUCCH a and PUCCH B, the terminal may prioritize PUCCH a and discard PUCCH B, or conversely, prioritize PUCCH B and discard PUCCH a.

(option 5-2)

When a collision occurs between PUCCH a and PUCCH B, PUCCH B may be multiplexed to PUCCH a and transmitted. At this time, by comparing QCL reference RSs (i.e., spatial relationship RSs) defined for two UL TCIs of PUCCH a and QCL reference RSs of PUCCH B, PUCCH can be transmitted using UL TCIs configured with the same RS. In addition, PUCCH transmission using a different UL TCI may not be performed.

For example, the first UL TCI and the second UL TCI may be configured for PUCCH a, the third UL TCI may be configured for PUCCH B, and QCL reference RSs of the first UL TCI and the third UL TCI may be the same. In this case, PUCCH B is multiplexed with PUCCH a, and the terminal may transmit PUCCH a through the first UL TCI. That is, STxMP-based transmission is not performed, and a corresponding PUCCH is transmitted through a single panel. Alternatively, the terminal may transmit the multiplexed PUCCH a through the first UL TCI and the existing UCI of the non-multiplexed PUCCH a through the second UL TCI, so that the terminal may perform STxMP-based transmission through the two panels.

In the above method, comparison of QCL reference RSs has been utilized, but additionally the top QCL source RSs (i.e., QCL reference RSs of UL TCI (e.g., RS a) or QCL reference RSs of RS a)) may be compared.

Alternatively, instead of comparing QCL reference RSs, when UL panel information for TCI (i.e., UL TCI) is present/configured, the above-described method may be applied by comparison between UL panels.

Alternatively, instead of comparing QCL reference RSs, the multiplexed UCI may be transmitted according to the STxMP scheme by multiplexing PUCCH B to PUCCH a and using/applying both UL TCIs of PUCCH a.

(options 5-3)

When a collision occurs between PUCCH a and PUCCH B, PUCCH a may be multiplexed with PUCCH B and transmitted. That is, UCI of two PUCCHs may be multiplexed and transmitted through PUCCH B.

At this time, as set forth in option 5-2 above, by comparing the QCL reference RS, the top QCL source RS, and the UL panel, etc., the terminal can transmit PUCCH a and PUCCH B according to the STxMP scheme by additionally transmitting PUCCH a using a UL TCI different from the UL TCI of PUCCH B among the two UL TCIs of PUCCH a.

For example, a first UL TCI and a second UL TCI may be configured and ACK/NACK transmission may be configured for PUCCH a, and a third UL TCI may be configured and CSI transmission may be configured for PUCCH B. In this case, if QCL reference RSs of the first UL TCI and the third UL TCI are identical, the terminal may multiplex ACK/NACK information and CSI and transmit them through PUCCH B, and simultaneously transmit ACK/NACK information through PUCCH a by applying the second UL TCI.

(options 5-4)

The terminal may transmit PUCCH a and PUCCH B according to the STxMP scheme by transmitting PUCCH a by applying only one UL TCI of two UL TCIs of PUCCH a and transmitting PUCCH B. Accordingly, PUCCH a may be transmitted only once instead of being repeatedly transmitted through STxMP-based transmission, and PUCCH B may be simultaneously transmitted using the remaining panels instead.

At this time, which UL TCI among the two UL TCIs of PUCCH a is to be applied may be determined by the method in the following example. For example, it may be determined to apply the TCI having the lowest TCI state ID among the two UL TCIs. As another example, it may be determined to apply a first UL TCI (first TCI state) of the two UL TCIs. As another example, among the two UL TCIs, a UL TCI having a QCL reference RS different from the UL TCI of PUCCH B may be determined.

Embodiment 6

As PUCCH transmission schemes, there are various schemes such as S-TRP-based PUCCH repetition/M-TRP-based PUCCH repetition/PUCCH without repetition.

In this regard, a method of applying or not applying STxMP-based transmission according to a transmission method of transmitting a PUCCH where collision occurs will be proposed.

For example, in case of collision between repeated PUCCHs, STxMP-based transmission may be excluded, and existing collision handling rules may be applied.

In case of collision between the S-TRP based repetition PUCCH and the non-repetition PUCCH, priority may be given to the repetition PUCCH according to an existing collision handling rule. Additionally or alternatively, in this case, if transmission panels of the S-TRP based repetition PUCCH and the non-repetition PUCCH are different, STxMP based transmission may be allowed.

Even in the case of collision between the M-TRP based repetition PUCCH and the non-repetition PUCCH, STxMP based transmission may not be allowed by prioritizing the M-TRP based repetition PUCCH. This is because, in the case of M-TRP based PUCCH repetition, it is complicated by the possibility of beam scanning. Additionally or alternatively, when a collision occurs between a non-repeated PUCCH and a specific TO of an M-TRP based repeated PUCCH, if transmission panels of the two PUCCHs are different, STxMP based transmission may be allowed.

In addition, when a plurality of TO of the repetition PUCCH collides with the non-repetition PUCCH, the following scheme may be considered.

For example, in the case where PUCCHs within a slot are repeated, a plurality of short PUCCHs may be repeatedly transmitted in one slot, and a collision between one long PUCCH configured not to be repeated and the plurality of short PUCCHs may occur. In this case, STxMP-based transmission may be performed on a short PUCCH having a transmission panel different from a long PUCCH among the collided plurality of short PUCCHs, otherwise the short PUCCH may be discarded. Alternatively, the terminal may discard all short PUCCHs where collisions occur and preferentially transmit long PUCCHs. In contrast, the terminal may discard the long PUCCH and transmit the short PUCCH.

The proposal of the present disclosure may be applied by a specific rule, but the base station may directly indicate/provide the configuration for the (specific) proposal method to the terminal without applying the specific rule.

According to the above proposal of the present disclosure, when a terminal capable of supporting simultaneous transmission (e.g., STxMP-based transmission) and enabling to receive scheduling/configuration of a collision PUCCH, ambiguity regarding transmission/dropping/multiplexing of a corresponding PUCCH is resolved, and a PUCCH transmission scheme can be clarified.

General device to which the present disclosure can be applied

Fig. 10 illustrates a block diagram of a wireless communication device according to an embodiment of the present disclosure.

Referring to fig. 10, the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various radio access technologies (e.g., LTE, NR).

The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and/or one or more antennas 108. The processor 102 may control the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure. For example, the processor 102 may transmit a wireless signal including the first information/signal through the transceiver 106 after generating the first information/signal by processing the information in the memory 104. In addition, the processor 102 may receive a wireless signal including the second information/signal through the transceiver 106 and then store information obtained through signal processing of the second information/signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for performing all or part of the processing controlled by the processor 102 or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow diagrams disclosed in this disclosure. Here, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement wireless communication technologies (e.g., LTE, NR). The transceiver 106 may be coupled to the processor 102 and may transmit and/or receive wireless signals via one or more antennas 108. Transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be used with an RF (radio frequency) unit. In this disclosure, a wireless device may mean a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally include one or more transceivers 206 and/or one or more antennas 208. The processor 202 may control the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure. For example, the processor 202 may generate the third information/signal by processing the information in the memory 204 and then transmit a wireless signal including the third information/signal through the transceiver 206. In addition, the processor 202 may receive a wireless signal including fourth information/signals through the transceiver 206 and then store information obtained through signal processing of the fourth information/signals in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for performing all or part of the processing controlled by the processor 202 or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow diagrams disclosed in this disclosure. Here, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver 206 may be coupled to the processor 202 and may transmit and/or receive wireless signals via one or more antennas 208. Transceiver 206 may include a transmitter and/or a receiver. The transceiver 206 may be used with an RF unit. In this disclosure, a wireless device may mean a communication modem/circuit/chip.

Hereinafter, the hardware elements of the wireless device 100, 200 will be described in more detail. Without limitation, one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). The one or more processors 102, 202 may generate one or more PDUs (protocol data units) and/or one or more SDUs (service data units) according to the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in the present disclosure. One or more processors 102, 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts included in the present disclosure. The one or more processors 102, 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information to provide to the one or more transceivers 106, 206 according to the functions, procedures, suggestions, and/or methods disclosed in the present disclosure. The one or more processors 102, 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in the present disclosure.

One or more of the processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more of the processors 102, 202 may be implemented in hardware, firmware, software, or a combination thereof. For example, one or more ASICs (application specific integrated circuits), one or more DSPs (digital signal processors), one or more DSPDs (digital signal processing devices), one or more PLDs (programmable logic devices), or one or more FPGAs (field programmable gate arrays) may be included in the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in the present disclosure may be implemented by using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, and the like. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and/or operational flow diagrams disclosed in this disclosure may be included in one or more processors 102, 202 or may be stored in one or more memories 104, 204 and driven by one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in this disclosure may be implemented using firmware or software in the form of codes, commands and/or command sets.

The one or more memories 104, 204 may be connected to the one or more processors 102, 202 and may store data, signals, messages, information, programs, code, instructions, and/or commands in various forms. One or more of the memories 104, 204 may be configured with ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage medium, and/or combinations thereof. The one or more memories 104, 204 may be located internal and/or external to the one or more processors 102, 202. In addition, one or more memories 104, 204 may be connected to one or more processors 102, 202 through various techniques, such as a wired or wireless connection.

One or more transceivers 106, 206 may transmit user data, control information, wireless signals/channels, etc. referred to in the methods and/or operational flowcharts, etc. of the present disclosure to one or more other devices. One or more transceivers 106, 206 may receive the user data, control information, wireless signals/channels, etc. mentioned in the description, functions, procedures, suggestions, methods, and/or operational flowcharts, etc. disclosed in this disclosure from one or more other devices. For example, one or more transceivers 106, 206 may be connected to one or more processors 102, 202 and may transmit and receive wireless signals. For example, the one or more processors 102, 202 may control the one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. In addition, the one or more processors 102, 202 may control the one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or more transceivers 106, 206 may be connected to one or more antennas 108, 208, and one or more transceivers 106, 206 may be configured to transmit and receive user data, control information, wireless signals/channels, etc. mentioned in the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts, etc. disclosed in this disclosure through one or more antennas 108, 208. In the present disclosure, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). The one or more transceivers 106, 206 may convert received wireless signals/channels, etc. from RF band signals to baseband signals to process received user data, control information, wireless signals/channels, etc. using the one or more processors 102, 202. The one or more transceivers 106, 206 may convert user data, control information, wireless signals/channels, etc., processed by using the one or more processors 102, 202 from baseband signals to RF band signals. Thus, one or more transceivers 106, 206 may include (analog) oscillators and/or filters.

The above-described embodiments are intended to combine elements and features of the present disclosure in a predetermined form. Individual elements or features should be considered optional unless explicitly mentioned otherwise. Each element or feature may be implemented in a form not combined with other elements or features. Additionally, embodiments of the present disclosure may include combined partial elements and/or features. The order of operations described in embodiments of the present disclosure may be changed. Some elements or features of one embodiment may be included in or substituted for corresponding elements or features of other embodiments. It will be apparent that embodiments may include claims that do not explicitly refer to a relationship in a combination claim or may be included as new claims by modification after application.

It will be apparent to those skilled in the relevant art that the present disclosure may be embodied in other specific forms without departing from the essential characteristics of the disclosure. The foregoing detailed description is, therefore, not to be taken in a limiting sense, and is intended to be illustrative in every respect. The scope of the present disclosure should be determined by a fair interpretation of the accompanying claims, and all changes that come within the meaning and range of equivalency of the disclosure are intended to be embraced therein.

The scope of the present disclosure includes software or machine-executable instructions (e.g., operating systems, application programs, firmware, programs, etc.) that perform operations in accordance with the methods of the various embodiments in an apparatus or computer, as well as non-transitory computer-readable media that cause the software or instructions to be stored and executed in an apparatus or computer. Commands that may be used to program a processing system that performs the features described in this disclosure may be stored in a storage medium or a computer readable storage medium, and the features described in this disclosure may be implemented by using a computer program product that includes such a storage medium. The storage medium may include, but is not limited to, high speed random access memory, such as DRAM, SRAM, DDRRAM or other random access solid state storage devices, and it may include non-volatile memory, such as one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or other non-volatile solid state storage devices. The memory optionally includes one or more storage devices located remotely from the processor. The memory, or alternatively, the non-volatile memory device in the memory, comprises a non-transitory computer-readable storage medium. The features described in this disclosure may be stored in any one of a variety of machine-readable media to control the hardware of the processing system, and may be integrated into software and/or firmware that allows the processing system to interact with other mechanisms using results from embodiments of the present disclosure. Such software or firmware may include, but is not limited to, application code, device drivers, operating systems, and execution environments/containers.

Here, the wireless communication technology implemented in the wireless apparatus 100, 200 of the present disclosure may include narrowband internet of things for low power consumption communication and LTE, NR, and 6G. Here, for example, NB-IoT technology may be an example of LPWAN (low power wide area network) technology, may be implemented in standards such as LTE Cat NB1 and/or LTE Cat NB2 and is not limited to the above names. Additionally or alternatively, wireless communication techniques implemented in the wireless devices 100, 200 of the present disclosure may perform communications based on LTE-M techniques. Here, for example, the LTE-M technology may be an example of the LPWAN technology and may be referred to as various names such as eMTC (enhanced machine type communication) and the like. For example, LTE-M technology may be implemented in at least any of a variety of standards, including 1) LTE CAT 0; 2) LTE Cat M1; 3) LTE Cat M2; 4) LTE non-BL (non-bandwidth limited); 5) LTE-MTC; 6) LTE machine type communication; and/or 7) LTE M, etc., and is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless device 100, 200 of the present disclosure may include at least any one of ZigBee, bluetooth, and low energy wide area network (LPWAN) that allows for low energy communication, and is not limited to the above names. For example, zigBee technology can generate PANs (personal area networks) related to small/low power consumption digital communication based on various standards (e.g., IEEE 802.15.4, etc.), and can be referred to by various names.

The method proposed by the present disclosure is mainly described based on an example applied to the 3GPP LTE/LTE-a, 5G system, but may also be applied to various wireless communication systems other than the 3GPP LTE/LTE-a, 5G system.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising the steps of:

receiving transmission reference information associated with a plurality of uplink channels from a network; and

transmitting at least one of the plurality of uplink channels in one time unit based on the transmission reference information,

wherein the transmission reference information includes at least one of a control resource set pool, an uplink channel group, an uplink channel format, uplink content or a transmission scheme, the control resource set pool is a CORESET pool, and

wherein the transmission of the at least one of the plurality of uplink channels is performed based on a first operation corresponding to simultaneous transmission of the plurality of uplink channels or a second operation corresponding to at least one of multiplexing or partial dropping for the plurality of uplink channels.

2. The method of claim 1, wherein the transmission of the at least one of the plurality of uplink channels is performed in accordance with the first operation based on the plurality of uplink channels being associated with different CORESET pools, and

Wherein the transmission of the at least one of the plurality of uplink channels is performed according to the second operation based on the plurality of uplink channels being associated with a same CORESET pool.

3. The method of claim 1, wherein the transmission of the at least one of the plurality of uplink channels is performed in accordance with the first operation based on the plurality of uplink channels being associated with different uplink channel groups, and

wherein the transmission of the at least one of the plurality of uplink channels is performed according to the second operation based on the plurality of uplink channels being associated with a same uplink channel group.

4. The method of claim 1, wherein whether to perform the transmission of the at least one of the plurality of uplink channels according to the first operation is determined based on at least one of the uplink channel format, the uplink content, or the transmission scheme of the plurality of uplink channels.

5. The method of claim 1, wherein the number of uplink channels that can be simultaneously transmitted is transmitted according to the first operation based on the number of the plurality of uplink channels exceeding the number of the terminals that can be simultaneously transmitted.

6. The method of claim 5, wherein a number of uplink channels capable of simultaneous transmission are respectively associated with different reference signal candidate sets.

7. The method of claim 5, wherein a number of uplink channels capable of simultaneous transmission is determined based on at least one of an index of the CORESET pool, an index of the uplink channel group, or an index of a resource.

8. The method of claim 1, wherein whether to apply the first operation or the second operation to the at least one of the plurality of uplink channels is determined based on a number of uplink transmission configuration indicators configured for each of the plurality of uplink channels.

9. The method of claim 1, further comprising the step of:

-receiving, from the network, indication information regarding an application of the first operation or the second operation related to the transmission of the at least one of the plurality of uplink channels.

10. The method of claim 1, wherein the uplink content corresponds to at least one of hybrid automatic repeat request-acknowledgement, HARQ-ACK, information, scheduling request, or channel state information, CSI.

11. The method of claim 1, wherein the transmission scheme is distinguished based on whether an uplink channel is repeated.

12. A terminal in a wireless communication system, the terminal comprising:

at least one transceiver; and

at least one processor coupled to the at least one transceiver,

wherein the at least one processor is configured to:

13. A base station in a wireless communication system, the base station comprising:

at least one transceiver; and

at least one processor coupled to the at least one transceiver,

wherein the at least one processor is configured to:

transmitting transmission reference information related to a plurality of uplink channels to a terminal; and

receiving at least one of the plurality of uplink channels in a time unit based on the transmission reference information,