KR20230004256A - Method and apparatus for subband duplex operation - Google Patents

Abstract

A partial band duplex (SD) operation method performed by a terminal comprises the following steps of: receiving slot pattern information for a slot from a base station; receiving information on at least one partial band from the base station; and performing uplink transmission and/or downlink reception with the base station in the at least one partial band belonging to at least one SD symbol belonging to the slot.

Description

Method and apparatus for sub-band duplex operation {METHOD AND APPARATUS FOR SUBBAND DUPLEX OPERATION}

The present invention relates to a communication method and apparatus for partial band duplex operation in a mobile communication system.

As scenarios in which wireless communication is applied, enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), and ultra-reliable and low latency communication (URLLC) may be considered. In addition, time sensitive communication (TSC) may be additionally considered. In particular, mMTC, URLLC, and TSC can be applied in IoT scenarios. All or some of the above scenarios must be supported in one network. The mMTC scenario is judged to satisfy the IMT-2020 requirements using NB-IoT and LTE-MTC, and a lot of discussion is needed to satisfy the URLLC scenario.

An object of the present invention to solve the above problems is to provide a method of operating a terminal and a method of operating a base station for partial band duplex operation.

Another object of the present invention to solve the above problems is to provide a configuration of a terminal and a base station for a partial band duplex operation.

According to an embodiment of the present invention for achieving the above object, a subband duplex (SD) operation method performed by a terminal includes: receiving slot pattern information for a slot from a base station; receiving information on at least one partial band from the base station; and performing uplink transmission and/or downlink reception with the base station in the at least one sub-band belonging to at least one SD symbol belonging to the slot.

The slot pattern information may be received by radio resource control (RRC) signaling or a combination of the RRC signaling and downlink control information (DCI).

The at least one SD symbol may be consecutive flexible (FL) symbols located between a downlink (DL) symbol and an uplink (UL) symbol in the slot.

The at least one SD symbol is consecutive symbols located between a DL symbol and a UL symbol in the slot (at least one DL symbol and at least one FL symbol) or (at least one FL symbol and at least one UL symbol ) can be configured.

Information on the at least one sub-band may be received through group common DCI, UE-specific DCI, or RRC signaling.

The information on the at least one sub-band may be limitedly applied to the at least one SD symbol.

The method further includes receiving information about a first symbol set and a second symbol set of the slot from the base station, wherein the information about the at least one sub-band corresponds to a first sub-band and a second sub-band. information, the first sub-band may be applied to the first symbol set, and the second sub-band may be applied to the second symbol set.

The terminal may perform DL reception in the first subband and UL transmission in the second subband.

A guard band may exist between the first sub-band and the second sub-band.

The information on the at least one sub-band may include information on a resource block (RB) set corresponding to each of the at least one sub-band.

The RB set may be indicated by a starting RB index and an ending RB index, or may be indicated by a starting RB index and the number of RBs constituting the RB set.

The receiving of information on at least one sub-band may include receiving information on a plurality of sub-bands through RRC signaling; and receiving a media access control (MAC) control element (CE) activating the at least one sub-band among the plurality of sub-bands.

According to another embodiment of the present invention for achieving the above object, a subband duplex (SD) operation method performed by a base station includes: transmitting slot pattern information for a slot to a terminal; Transmitting information on at least one partial band to the terminal; and performing uplink reception and/or downlink transmission with the terminal in the at least one sub-band belonging to at least one SD symbol belonging to the slot.

The at least one SD symbol may be consecutive flexible (FL) symbols located between a downlink (DL) symbol and an uplink (UL) symbol in the slot.

The at least one SD symbol is consecutive symbols located between a DL symbol and a UL symbol in the slot (at least one DL symbol and at least one FL symbol) or (at least one FL symbol and at least one UL symbol ) can be configured.

The method further includes transmitting information about a first and a second symbol set of the slot to the terminal, wherein the information about the at least one sub-band corresponds to the first sub-band and the second sub-band. information, the first sub-band may be applied to the first symbol set, and the second sub-band may be applied to the second symbol set.

The base station may perform DL transmission in the first subband and UL reception in the second subband.

According to another embodiment of the present invention for achieving the above object, a subband duplex (SD) operation method performed by a terminal includes: receiving configuration information for CORESET from a base station; determining whether at least a portion of the CORESET is unavailable; and when it is determined that at least a part of the CORESET is unavailable, under the assumption that control channel elements (CCEs) are mapped only to valid resource element group (REG) bundle(s) belonging to the CORESET, the valid REG bundle It may include monitoring a downlink control channel (physical downlink control channel) in (s).

At least a part of the CORESET is resource elements (REs) in which the downlink (DL) reception operation of the terminal is impossible due to a duplex gap or guard time according to the partial band duplex operation can be

The valid REG bundle(s) may be REG bundle(s) that do not include resource elements in which the DL reception operation of the terminal is impossible.

According to embodiments of the present invention, a processing method of a wireless system for partial band duplex operation may be provided. Thus, the efficiency of radio resource use of the communication system is increased, and the performance of the communication system can be improved.

1 is a conceptual diagram illustrating a first embodiment of a communication system.
Figure 2 is a block diagram showing a first embodiment of a device.
3 is a conceptual diagram for explaining an example of a configuration of resource allocation capable of performing DL transmission and UL reception in a specific slot.
4 is a conceptual diagram for explaining another example of a configuration of resource allocation capable of performing DL transmission and UL reception in a specific slot.
5 is a conceptual diagram illustrating an embodiment in which characteristics of subcarriers for consecutive SD symbols are configured as a bitmap.
6 is a conceptual diagram for explaining an example in which characteristics of subcarriers are expressed using an RB set.
7 is a conceptual diagram for explaining an example in which characteristics of subcarriers are expressed using RMR.
8 to 10 are conceptual diagrams illustrating cases in which some resources of CORESET are not received.
11 is a conceptual diagram for explaining an example of indexing for REG bundles mapped to valid resources.
12 is a conceptual diagram for explaining an example of utilizing a REG having invalid REs.
13 is a conceptual diagram for explaining examples of REGs and REG bundles according to CORESET duration.
14 is a conceptual diagram for explaining an example of interpreting the same resource as three consecutive resources, and FIG. 15 is a conceptual diagram for explaining another example of interpreting the same resource as three consecutive resources.
16 is a conceptual diagram for explaining an example of performing PUSCH rate matching according to an invalid resource.
17 is a conceptual diagram for explaining an example in which actual PUSCH instances are classified according to invalid resources.
18 is a conceptual diagram for explaining an example in which a full duplex operation is performed for one terminal in one carrier.
19 is another conceptual diagram for explaining an example in which a full duplex operation for one terminal is performed in one carrier.
20 is a conceptual diagram for explaining an example in which one UE performs only a part of DL reception for UL transmission in one carrier.
21 is a conceptual diagram for explaining an example in which one UE performs only a part of UL transmission for DL reception in one carrier.

Since the present invention can make various changes and have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The term "and/or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

In embodiments of the present application, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B”. Also, in the embodiments of the present application, “one or more of A and B” may mean “one or more of A or B” or “one or more of combinations of one or more of A and B”.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, they should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail. In order to facilitate overall understanding in the description of the present invention, the same reference numerals are used for the same components in the drawings, and redundant descriptions of the same components are omitted.

A communication system to which embodiments according to the present invention are applied will be described. The communication system may be a 4G communication system (eg, a long-term evolution (LTE) communication system, an LTE-A communication system), a 5G communication system (eg, a new radio (NR) communication system), a 6G communication system, and the like. there is. The 4G communication system can support communication in a frequency band of 6 GHz or less, and the 5G communication system can support communication in a frequency band of 6 GHz or more as well as a frequency band of 6 GHz or less. A communication system to which embodiments according to the present invention are applied is not limited to the contents described below, and embodiments according to the present invention can be applied to various communication systems. Here, the communication system may be used in the same sense as a communication network, "LTE" may indicate "4G communication system", "LTE communication system" or "LTE-A communication system", and "NR" may indicate "5G communication system" or "NR communication system".

In an embodiment, “setting an operation (eg, transmission operation)” means “setting information for the corresponding operation (eg, information element, parameter)” and/or “performing the corresponding operation”. It may mean that the "instructing information" is signaled. "Setting an information element (eg, parameter)" may mean that a corresponding information element is signaled. "Configuring a resource (eg, a resource region)" may mean that configuration information of a corresponding resource is signaled. Signaling is system information (SI) signaling (eg, transmission of system information block (SIB) and / or master information block (MIB)), RRC signaling (eg, transmission of RRC parameters and / or higher layer parameters) , MAC control element (CE) signaling, or PHY signaling (eg, transmission of downlink control information (DCI), uplink control information (UCI), and/or sidelink control information (SCI)).

1 is a conceptual diagram illustrating a first embodiment of a communication system.

Referring to FIG. 1, a communication system 100 includes a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). In addition, the communication system 100 includes a core network (eg, a serving-gateway (S-GW), a packet data network (PDN)-gateway (P-GW), and a mobility management entity (MME)). can include more. When the communication system 100 is a 5G communication system (eg, a new radio (NR) system), the core network includes an access and mobility management function (AMF), a user plane function (UPF), a session management function (SMF), and the like. can include

The plurality of communication nodes 110 to 130 may support communication protocols (eg, LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.) defined in the 3rd generation partnership project (3GPP) standard. The plurality of communication nodes 110 to 130 are CDMA (code division multiple access) technology, WCDMA (wideband CDMA) technology, TDMA (time division multiple access) technology, FDMA (frequency division multiple access) technology, OFDM (orthogonal frequency division) multiplexing) technology, filtered OFDM technology, CP (cyclic prefix)-OFDM technology, DFT-s-OFDM (discrete Fourier transform-spread-OFDM) technology, OFDMA (orthogonal frequency division multiple access) technology, SC (single carrier)-FDMA technology, NOMA (Non-orthogonal Multiple Access) technology, GFDM (generalized frequency division multiplexing) technology, FBMC (filter bank multi-carrier) technology, UFMC (universal filtered multi-carrier) technology, SDMA (Space Division Multiple Access) technology, etc. can support Each of the plurality of communication nodes may mean an apparatus or a device. Embodiments may be performed by an apparatus or device. The structure of the device (eg, device) may be as follows.

Figure 2 is a block diagram showing a first embodiment of a device.

Referring to FIG. 2 , an apparatus 200 may include at least one processor 210, a memory 220, and a transceiver 230 connected to a network to perform communication. In addition, the device 200 may further include an input interface device 240 , an output interface device 250 , a storage device 260 , and the like. Each component included in the device 200 may be connected by a bus 270 to communicate with each other.

The processor 210 may execute a program command stored in at least one of the memory 220 and the storage device 260 . The processor 210 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. Each of the memory 220 and the storage device 260 may include at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 220 may include at least one of a read only memory (ROM) and a random access memory (RAM).

Referring back to FIG. 1, the communication system 100 includes a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2), a plurality of terminals 130- 1, 130-2, 130-3, 130-4, 130-5, 130-6). Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may form a macro cell. Each of the fourth base station 120-1 and the fifth base station 120-2 may form a small cell. The fourth base station 120-1, the third terminal 130-3, and the fourth terminal 130-4 may belong to the cell coverage of the first base station 110-1. The second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 may belong to the cell coverage of the second base station 110-2. The fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 may belong to the cell coverage of the third base station 110-3. there is. The first terminal 130-1 may belong to the cell coverage of the fourth base station 120-1. The sixth terminal 130-6 may belong to the cell coverage of the fifth base station 120-2.

Here, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 is a NodeB (NB), an evolved NodeB (eNB), a gNB, an advanced base station (ABS), and a HR -BS (high reliability-base station), BTS (base transceiver station), radio base station, radio transceiver, access point, access node, radio access station (RAS) ), MMR-BS (mobile multihop relay-base station), RS (relay station), ARS (advanced relay station), HR-RS (high reliability-relay station), HNB (home NodeB), HeNB (home eNodeB), It may be referred to as a road side unit (RSU), a radio remote head (RRH), a transmission point (TP), a transmission and reception point (TRP), and the like.

Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 includes user equipment (UE), terminal equipment (TE), advanced mobile station (AMS), HR-MS (high reliability-mobile station), terminal, access terminal, mobile terminal, station, subscriber station, mobile station, mobile It may be referred to as a portable subscriber station, a node, a device, an on board unit (OBU), and the like.

Meanwhile, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in different frequency bands or may operate in the same frequency band. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to each other through an ideal backhaul link or a non-ideal backhaul link, and , information can be exchanged with each other through an ideal backhaul link or a non-ideal backhaul link. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to the core network through an ideal backhaul link or a non-ideal backhaul link. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits a signal received from the core network to a corresponding terminal 130-1, 130-2, 130-3, and 130 -4, 130-5, 130-6), and signals received from corresponding terminals 130-1, 130-2, 130-3, 130-4, 130-5, 130-6 are transmitted to the core network can be sent to

In addition, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits MIMO (eg, single user (SU)-MIMO, multi-user (MU)- MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, direct communication between devices (device to device communication, D2D) (or , proximity services (ProSe)), Internet of Things (IoT) communication, dual connectivity (DC), etc. may be supported. Here, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 is a base station 110-1, 110-2, 110-3, 120-1 , 120-2) and operations supported by the base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be performed. For example, the second base station 110-2 can transmit a signal to the fourth terminal 130-4 based on the SU-MIMO scheme, and the fourth terminal 130-4 uses the SU-MIMO scheme. A signal may be received from the second base station 110-2. Alternatively, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 based on the MU-MIMO scheme, and the fourth terminal 130-4 And each of the fifth terminal 130-5 may receive a signal from the second base station 110-2 by the MU-MIMO method.

Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may transmit a signal to the fourth terminal 130-4 based on the CoMP scheme, and The terminal 130-4 may receive signals from the first base station 110-1, the second base station 110-2, and the third base station 110-3 by CoMP. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 includes a terminal 130-1, 130-2, 130-3, and 130-4 belonging to its own cell coverage. , 130-5, 130-6) and a CA method. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 controls D2D between the fourth terminal 130-4 and the fifth terminal 130-5. and each of the fourth terminal 130-4 and the fifth terminal 130-5 may perform D2D under the control of the second base station 110-2 and the third base station 110-3, respectively. .

As scenarios in which wireless communication is applied, enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), and ultra-reliable and low latency communication (URLLC) may be considered. In addition, time sensitive communication (TSC) may be additionally considered. In particular, mMTC, URLLC, and TSC can be applied in IoT scenarios. All or some of the above scenarios must be supported in one network. The mMTC scenario is judged to satisfy the IMT-2020 requirements using NB-IoT and LTE-MTC, and a lot of discussion is needed to satisfy the URLLC scenario.

In order to reduce the error rate of data, a lower code rate and modulation rate (MCS) rate can be applied. However, in order not to increase the size of the field indicated by the DCI, MCSs that occur most frequently are selected, and then repeated transmission is supported to apply a lower MCS. In the case of the modulation rate, since QPSK is the lowest, an effect of further lowering the code rate can be obtained. In particular, since transmission power is limited in the case of UL, repetition can be performed in time resources rather than in frequency resources.

The eMBB traffic and URLLC traffic supported by the 5G system need to be lowered by MCS for different purposes. eMBB traffic requires a lower MCS to extend reach, whereas URLLC traffic requires a lower MCS to reduce latency and achieve a lower error rate. Because of these different requirements, eMBB traffic can be transmitted repeatedly consuming relatively delay time, and URLLC traffic can be used in DCI/RRC by introducing new MCSs rather than being repeatedly transmitted.

In order to temporally support repeated transmission of eMBB traffic, PUSCH repetition (or PUSCH repetition type A) has been introduced. In this case, PUSCH (or PUSCH mapping type A) allocated per slot is repeatedly transmitted. In order to extend the reach, this is a setting that allocates time resources over several slots. In DCI (type 2 configured grant and dynamic grant) / RRC (type 1 configured grant), by including only time resources transmitted in the first slot and indicating the number of repetitions with RRC signaling, time resources possessed by PUSCH repetition type A this is decided

In order to support URLLC traffic, it is desirable for a terminal to perform a reception operation more frequently using DL resources and a transmission operation more frequently using UL resources. In a time division duplex (TDD) system, since a terminal operates in a half duplex method, DL traffic and UL traffic are supported according to a set slot pattern (ie, UL/DL pattern) A lot of delay time may be generated to do so. On the other hand, in a frequency division duplex (FDD) system, since a UE can simultaneously utilize DL resources and UL resources, the aforementioned delay time problem does not occur. The FDD system uses two carriers. Even in the case of a TDD system, if two or more serving cells are configured for the UE, the UE can utilize DL resources and UL resources at the same time.

For example, in a system including at least one carrier operating in an FDD scheme, a UE may not have a delay time disadvantage. For example, in a system composed only of carriers operating in the TDD scheme, a disadvantage of delay time may occur to the terminal. To solve this problem, slots may be configured with different patterns in carriers operating in the TDD scheme.

Carrier aggregation (CA) is configured for the UE, and the PCell and at least one SCell may be activated. The PCell and the SCell may be distinguished in that the PCell includes at least one common search space (CSS) set. Here, in order to reduce delay time when URLLC traffic is supported, slots having different patterns may be configured and instructed to the terminal.

Sub-Band Duplex Operation

1 How to interpret duplex directions in sub-bands

In a TDD system, a slot pattern may be configured for a UE through RRC signaling. By receiving an additional DCI (eg, DCI format 2_0), downlink (DL) reception or uplink (UL) transmission is performed in a symbol set as a flexible (FL) symbol in a slot by RRC signaling. can The operation of the terminal according to the conventional technical standard is illustrated in Table 1.

An index included in DCI format 2_0 must indicate a DL symbol configured to the UE through RRC signaling as a DL symbol. Similarly, the index included in DCI format 2_0 should indicate the UL symbol configured to the UE through RRC signaling as a UL symbol. However, in an FL symbol configured for a UE through RRC signaling, reception of a DL signal and/or channel or transmission of a UL signal and/or channel may be permitted by an index included in DCI format 2_0. Here, the UE should consider only the DL signal and/or channel and/or the UL signal and/or channel allocated by scheduling DCI.

Table 1 below relates to transmission and reception interpretation methods when the terminal is configured to receive DCI format 2_0.

If DCI is not additionally received, the UE assumes only DL/FL/UL configured with RRC signaling. Accordingly, reception of a DL signal and/or channel may not be permitted in the FL symbol, and transmission of a UL signal and/or channel may not be permitted.

Uplink coverage may be limited while the UE operates in a full duplex scheme or a half duplex scheme. In this case, it is desirable that more FL symbols can be utilized as UL symbols. In a specific slot consisting of DL symbol(s), FL symbol(s), and UL symbol(s), specific subcarrier(s) of FL symbol(s) can be utilized for downlink and other specific subcarrier(s) A system that can be utilized for uplink is considered.

Consider a case where there are two or more consecutive FL symbols in a slot. This is because there is no symbol corresponding to a guard time if both downlink reception and uplink transmission are performed in one FL symbol. In one example, the FL symbols are (subcarrier(s) performing DL reception (i.e., DL subcarriers) and FL subcarrier(s)), (DL subcarrier(s), FL subcarrier(s), and performing UL transmission subcarrier(s) (i.e., UL subcarrier(s)), or (FL subcarriers and UL subcarriers). In another example, some of the FL symbols are utilized not only for DL reception but also for UL transmission. DL subcarrier(s), FL subcarrier(s), and UL subcarrier(s).

1.1 Method using Enhanced SFI

Considering specific FL symbols, guard subcarrier(s) or guard tone(s) are required between DL reception and UL transmission. Therefore, reducing the number of guard subcarrier(s) is desirable in terms of transmission efficiency. To this end, it is desirable that the number of boundaries in which DL and UL are changed is small. If both DL reception and UL transmission are allowed in FL symbol(s), UL transmission is preferably performed on subcarriers having a low frequency so that the reception SINR of the UL signal/channel in the base station increases.

3 is a conceptual diagram for explaining an example of a configuration of resource allocation capable of performing DL transmission and UL reception in a specific slot.

Referring to FIG. 3, FL symbols are continuously positioned, and FL symbols may be positioned between a DL symbol and a UL symbol. An area where UL signals/channels can be transmitted can be allocated to lower frequencies, and an area where DL signals/channels can be received can be allocated to higher frequencies. Here, since the terminal can operate in a half duplex scheme, it may not transmit a UL signal/channel while receiving a DL signal/channel.

4 is a conceptual diagram for explaining another example of a configuration of resource allocation capable of performing DL transmission and UL reception in a specific slot.

Referring to FIG. 4, a UL signal/channel may be allocated to be transmitted on some subcarriers of symbols from which a DL signal/channel may be received. Therefore, the frequency domain in which the UL signal/channel is transmitted may divide the frequency domain in which the DL signal/channel is received into two or more parts. In this case, in order to reduce interference (ie, adjacent channel leakage ratio (ACLR), etc.) of the UE's UL transmission to the adjacent band, the frequency domain in which the UL signal / channel is transmitted may not be located at the edge of the carrier. .

FL symbols and/or UL symbols may be referred to as non-DL symbols (or subband duplex (SD) symbols or subband full duplex (SBFD) symbols). In one embodiment, the SD symbol may mean only the FL symbol or may mean the FL symbol and the UL symbol.

Alternatively, FL symbols and/or DL symbols may be referred to as non-UL symbols (or SD symbols or SBFD symbols). In another embodiment, the SD symbol may also include some symbols of DL symbols, and in this case, it may mean a DL symbol, an FL symbol, or a UL symbol.

An arbitrary DL/UL pattern may be applied to subcarriers belonging to SD symbols whose duplex may vary for each subband. The base station may set this pattern to the terminals through RRC signaling or may indicate DCI. For convenience of description, this DCI is referred to as DCI format x.

In the proposed method, the SD symbol may be a symbol that is not indicated as a DL symbol in a common pattern of slot patterns. An SD symbol of one terminal may be indicated to another terminal as a DL symbol, FL symbol, UL symbol, or SD symbol according to a slot pattern for each terminal. Through RRC signaling, in the DL BWP and UL BWP configured for the UE, it can be known in which regions (ie, REs) DL reception is allowed and UL transmission is allowed.

Method 1-1: BWP configuration may include information on a DL region and a UL region in a frequency domain that can be allowed in an SD symbol.

The base station may determine which subcarriers of the SD symbol are to be placed in the DL region or the UL region according to the traffic situation or the location of the UE. This may be indicated to the UE by DCI. The base station may instruct the terminal using a group common DCI or a UE-specific DCI. For example, DCI format x may be DCI format 2_0.

In another example, DCI format x may be DCI format 2_1 or DCI format 2_4. DCI format 2_4 may be received by several terminals and may indicate a resource pattern for which UL transmission is allowed or not allowed.

Method 1-2: The UE can know patterns (DL, FL, UL) of subcarriers of an SD symbol by receiving DCI.

In DCI format x, a pattern of slots may be included as an index. More specifically, a DCI is formed by concatenating indices to be interpreted by several terminals, and each index can be interpreted as a pattern of slots. Each terminal may be configured with RRC signaling to determine where information should be obtained from DCI.

Method 1-3: For a given SD symbol, a pattern for subcarriers can be known by an index.

An index derived from the start index of a PRB or CRB and the number of consecutive RBs may be given for each SD symbol. In this method, when the number of SD symbols is large, a signaling burden may be high because many indices must be provided.

To solve this problem, a method of deriving a pattern for subcarriers from information having a fixed size may be considered.

Method 1-4: For a given SD symbol, a pattern for subcarriers may be known as a 2D bitmap.

The length of the 2D bitmap may be set by RRC signaling to the UE. One bit may mean a set of REs represented by consecutive symbols and consecutive subcarriers. Here, one value of each bit of the bitmap means that use of DL and UL in a set of REs corresponding to the corresponding bit is permitted, and other values are not permitted.

Method 1-5: In Method 1-4, the total length constituting the 2D bitmap and the length constituting one axis (ie, the number of consecutive symbols or the number of consecutive subcarriers) have independent values, and It can be configured with RRC signaling.

5 is a conceptual diagram illustrating an embodiment in which characteristics of subcarriers for consecutive SD symbols are configured as a bitmap.

Referring to FIG. 5, one value (eg, '1') set in each bit of the bitmap indicates that utilization of DL and UL is permitted, and another value (eg, '0') indicates that DL and UL You can indicate what is not allowed to be used. An area corresponding to a bit set to 1 may be interpreted as being utilized for UL transmission in a low frequency domain and as being utilized for DL reception in a high frequency domain. Conversely, 0 and 1 may be interpreted interchangeably, and DL and UL may be interpreted interchangeably.

The arrangement of 1's and 0's in the pattern of subcarriers in a given time (or SD symbol) may be limited. That is, the position of 0 is a configuration in which consecutive 1(s), consecutive 0(s), and consecutive 1(s) are arranged, or consecutive 0(s), in the order of increasing frequency at a given time. It may be limited to a configuration in which contiguous 1(s) are arranged, or a configuration in which contiguous 1(s) and contiguous 0(s) are arranged. In addition, the position of 0 is a configuration in which consecutive 1(s), consecutive 0(s), and consecutive 1(s) are arranged in order of increasing time at a given frequency, or consecutive 0(s) It may be limited to a configuration in which contiguous 1(s) are arranged, or a configuration in which contiguous 1(s) and contiguous 0(s) are arranged.

Therefore, it has a time order of DL, FL, and UL at a given frequency, and can satisfy a frequency order of DL, FL, and UL (or UL, FL, and DL) at a given time. This can be summarized by methods 1-6. In addition, positions of 0s represented by FL are arranged adjacent to each other in the time and frequency domains, and continuous 0s may not be broken by being surrounded by 1s in time or frequency.

Method 1-6: In method 1-4, the method in which the values of the bitmap are arranged may satisfy the rule that the pattern for time at a given frequency and the pattern for frequency at a given time are the same.

Method 1-7: In method 1-6, time and frequency resources classified as FL may not be divided by resources classified as UL and DL.

Here, since the numerologies of the DL BWP and the UL BWP may be different from each other, a reference numerology may be applied. Accordingly, the number of symbols and subcarriers corresponding to one bit may vary depending on whether it is interpreted in DL or UL.

The method expresses characteristics of subcarriers for consecutive FL symbols in one slot. When DCI format x is used, since a pattern of several consecutive slots is derived from one index, characteristics of FL symbols may also be included for each slot.

The number of slots (eg, N) may be set to the terminal through RRC signaling, and a pattern for N slots may be derived by one index. For example, N may not be greater than maxNrofSlotFormatsPerCombination.

Alternatively, a period in which DCI format x is received may be set to the terminal through RRC signaling, and indexes derived from DCI format x may be interpreted for SD symbols belonging to one period. For example, when a period in which DCI format x is received is y slots, SD symbols in units of z may be distinguished. Here, one unit means consecutive FL symbols, and the value of z can be derived differently for each slot pattern. The UE may apply an index derived from DCI format x to SD symbols belonging to one unit. Accordingly, the size of the resource for which the index is interpreted (ie, the number of symbols and/or characteristics of subcarriers) may be different for each slot pattern.

In order to derive characteristics of SD symbols for N slots, DCI format x may include N 2D bitmaps readable by the UE. Alternatively, by reading one 2D bitmap from DCI format x, the characteristics of SD symbols in N slots can be equally applied.

Method 1-8: The UE can derive one 2D bitmap from DCI format x, and accordingly, the characteristics of SD symbols can be equally applied to N slots.

A 2D bitmap may be expressed as a 1D bit string according to a predetermined rule. It can be interpreted to one or several terminals. Alternatively, several 1D bit strings may be concatenated. There may be one or more UE group(s) corresponding to one 2D bitmap or one 1D bit string.

1.2 Method using RB set

Since DCI format x has a characteristic commonly transmitted to several terminals, it may affect the average performance of the base station. In order to indicate the frequency resource structure of the SD symbol to specific terminals that intend to interpret the SD symbol, a method of using RRC signaling may be considered.

Method 1-9: RB set (s) is indicated to the UE through RRC signaling, and the UE uses DL PRB (s) and UL PRB (s) for SD symbols based on the RB set (s) The PRB(s) to be interpreted are known.

DL PRB(s) may consist of only subcarriers capable of receiving DL signals/channels, and UL PRB(s) may consist of only subcarriers capable of transmitting UL signals/channels. A DL signal/channel and a UL signal/channel are not allocated to the PRB(s) that do not belong thereto, and the corresponding PRB(s) may be used as guard tones. The RB set is set only as a reference numerology or is set for each subcarrier spacing (SCS), and is determined by the index of the starting common resource block (CRB) calculated based on pointA and the number of consecutive CRBs. there is. That is, an RB set may be defined by a CRB grid.

An RB set may be indicated by one RB index and the number of RBs. The RB set may include both RB(s) to which data may be mapped or RBs to which data may not be mapped (ie, a guard band or gap).

6 is a conceptual diagram for explaining an example in which characteristics of subcarriers are expressed using an RB set.

또는

는 RB 인덱스만으로 표현될 수도 있지만, RB 인덱스와 RB들의 개수가 더해진 값으로부터 도출될 수도 있다. 여기서,

는 자연수일 수 있다. 예컨대, RB 집합 0은

와

로 표현될 수 있고, gap인 RB 집합은

와

로 표현될 수 있다. RB 집합 1은

와

로 표현될 수 있고, 또 다른 gap인 RB 집합은

와

로 표현될 수 있다. RB 집합 2는

와

로 표현될 수 있다. 여기서,

또는

는 부반송파 간격 혹은 BWP마다 지시될 수 있다. Referring to Figure 6,

or

may be expressed with only the RB index, but may be derived from a value obtained by adding the RB index and the number of RBs. here,

may be a natural number. For example, RB set 0 is

Wow

It can be expressed as, and the gap RB set is

Wow

can be expressed as RB set 1 is

Wow

It can be expressed as, and another set of gaps, RB, is

Wow

can be expressed as RB set 2 is

Wow

can be expressed as here,

or

may be indicated for each subcarrier interval or BWP.

The UE may be instructed on a set of RBs interpreted as DL subcarriers in a specific symbol. Similarly, the UE may be instructed to set RBs interpreted as UL subcarriers in a specific symbol. Specifically, the following methods may be considered.

Method 1-10: The symbols to which the UE applies the RB set may be limited to SD symbols.

Method 1-11: A set of symbols to which an RB set for DL reception is applied or a set of symbols to which an RB set for UL transmission is applied may be indicated by separate RRC signaling to the UE.

Method 1-12: If separate RRC signaling is not instructed to the UE, the UE may apply an RB set for DL reception and an RB set for UL transmission to all symbols belonging to a slot.

Since the RB set is indicated to the UE by RRC signaling, it may be difficult to apply the flexible RB set. Accordingly, several RB sets are configured for the UE, and any one RB set may be selected from among them. The base station may transmit MAC signaling indicating activation/deactivation of any one RB set to the terminal. For example, the RB set may be indicated to the UE using an index.

Method 1-13: The UE may be instructed to activate or deactivate a specific RB set(s) using MAC CE.

Method 1-14: In Method 1-13, an RB set for DL reception and an RB set for UL transmission may be independently instructed to the UE.

Method 1-15: In Method 1-13, when an RB set is indicated to the UE, the UE may derive an RB set for DL reception and an RB set for UL transmission from the indicated RB set.

When an RB set is indicated to the terminal, the terminal may apply the RB set to the duplex direction of symbols indicated by the SFI received as a group common DCI.

1.3 Method using rate matching resource (RMR)

In order to analyze frequency resources of SD symbols, an indication method using scheduling DCI may be considered. In the method of indicating the frequency resource of an SD symbol using group common DCI (eg, DCI format x), BLER may increase because a group common DCI having an increased size is received by terminals. However, if the scheduling DCI includes information on the frequency resource of the SD symbol, there is an advantage in that only a UE receiving a PDSCH or transmitting a PUSCH in the corresponding SD symbol receives information on the frequency resource of the SD symbol.

Method 1-16: Time and frequency resources including SD symbols may be expressed using a method of indicating a rate matching resource (RMR) in Scheduling DCI.

A field indicating application or non-application of RMR is included in the DCI format for scheduling the PDSCH, so that the location to which the REs of the PDSCH are mapped can be indicated to the UE. In addition, a field indicating application or non-application of RMR is included in the DCI format for scheduling the PUSCH, so that the location to which the REs of the PUSCH are mapped can be indicated to the UE.

The purpose of excluding data mapping for RMR is to suppress DL-UL interference by securing guard tones, and to dynamically reduce DL-UL interference with neighboring base stations by utilizing scheduling DCI including RMR. is to minimize

In the existing technical specifications, RMR was used for the purpose of preventing CORESET and PDSCH from colliding. According to the proposed method, since RMR is used to indirectly indicate guard subcarriers, the size of the field indicating RMR can be increased. Alternatively, a separate field may be introduced in scheduling DCI.

Method 1-17: When RMR for indirectly indicating guard subcarriers is indicated by scheduling DCI, the RMR may be indicated by increasing the size of a field indicating the RMR or introducing a separate field.

When guard REs are derived from the indicated RMR, RE(s) to which data of PDSCH or PUSCH is mapped and RE(s) to which data of PDSCH or PUSCH are not mapped can be distinguished. In addition, filtering or power control may be required to reduce DL-UL interference. Energy (or power or energy per resource element (EPRE)) allocated to the RE(s) to which data is mapped is not changed. However, even if energy of 0 is allocated to RE(s) to which data is not mapped, energy transmitted or received by sidelobes from adjacent REs may not be small, which may act as inter-carrier interference (ICI) .

Therefore, a base station transmitting a PDSCH or a terminal transmitting a PUSCH may perform multi-carrier modulation (IDFT) after appropriate filtering in a frequency domain.

If a method of indicating an RB set (or guard band) to the UE is applied, since RRC signaling is used, time for applying or changing the location of the guard subcarrier(s) may increase. Also, when RF filtering is performed in the guard band, time may be required for changing the RB set. For example, a time derived from the time to change the BWP may be applied.

On the other hand, in the method using RMR for indirectly indicating guard subcarriers, only data mapping is restricted without performing RF filtering, so time for ensuring RF retuning is unnecessary. Using this advantage, the base station can schedule the PDSCH in a section in which DL symbols and SD symbols are consecutive, or schedule the PUSCH in a section in which UL symbols and SD symbols are consecutive. If an RB set accompanied by RF filtering is indicated, it is difficult to schedule a PDSCH (or PUSCH) in a period in which DL (or UL) symbols and SD symbols are consecutive, and the minimum interval between DL (or UL) symbols and SD symbols is may have to be guaranteed.

7 is a conceptual diagram for explaining an example in which characteristics of subcarriers are expressed using RMR.

Referring to FIG. 7 , RMR may occur periodically, and whether the RMR is applied or ignored may be determined by scheduling DCI. The UE receives the scheduling DCI, interprets the bit(s) associated with the RMR(s), and applies the RMR(s) according to the value of the corresponding bit(s) so that the PDSCH (or PUSCH) does not belong to the RMR(s). It may be mapped only to REs that do not belong to the RMR(s) or may be mapped to REs belonging to RMR(s). In one example, the RMR group is indicated to the UE by RRC signaling, and the RMR group may indicate some of the RMRs. A certain field of Scheduling DCI corresponds to an RMR group, and it is possible to determine which bit of the field to map data in consideration of RMR(s) belonging to which RMR group. RMR is a resource composed of RB(s) and symbol(s) and is given to the UE through RRC signaling, and the time resource at which RMR occurs is expressed as an index and indicated to the UE through RRC signaling, and the period and slot offset are index can be derived from Therefore, RMRs may not always overlap in time resources where PDSCH (or PUSCH) is scheduled, and RMR groups may not be reflected in data mapping according to bits indicated in scheduling DCI.

For the RMR group instructed to reflect in the scheduling DCI, the UE may map data by considering it to be composed of activated RMR. The RMR group may correspond to PDSCH or PUSCH. The RMR for PDSCH and the RMR for PUSCH may be indicated in different resource units. As an example, the RMR for PDSCH may be expressed as a bitmap expressing RBs and symbols with one bit, but the RMR for PUSCH may represent symbols as well as bitmaps expressing RB(s) and symbol(s) as one bit. It can be expressed as a bitmap expressing (s) as one bit.

In this case, when the PUSCH is transmitted in CP-OFDM, it can be expressed as a bitmap representing RB (s) and symbol (s) in units, and when the PUSCH is transmitted in DFT-s-OFDM, symbol (s) ) can be expressed as a bitmap expressing units. In this case, the terminal may receive a method of interpreting the RMR bitmap through RRC signaling.

Method 1-18: RMRs corresponding to DL and RMRs corresponding to UL may be independently indicated to the UE.

An RMR (or RMR group) may be used to represent an RB set (or guard band). In this case, a bitmap representing RB(s) and symbol(s) as a unit may be utilized, and the RBs and symbols may be interpreted using a subcarrier interval derived from reference numerology. In an RB set (or guard band), PDSCH and PUSCH cannot be mapped, and the RMR for PDSCH and/or RMR for PUSCH must be derived from one signaling. Since the DL BWP and the UL BWP may have different subcarrier intervals, the interpretation of the RMR for DL may be different from the interpretation of RMR for UL.

Method 1-19: When RMRs are indicated to the UE, the UE may derive RMRs corresponding to DL and RMRs corresponding to UL from the indicated RMRs.

In one example, when RMR (or RMR group) means an RB set (or guard band), RMR (or RMR group) may not necessarily be instructed to the UE only through scheduling DCI, and can be received from group common DCI there is. The group common DCI may have a separate format in order to indicate the RB set (or guard band) to the terminal (s), or may reuse a format supported in the conventional technical standard.

A plurality of candidate RMRs are indicated to the UE by RRC signaling, and one candidate RMR may be selected using a small number of bits of scheduling DCI or group common DCI. In order for the candidate RMR(s) to be appropriately indicated to a corresponding terminal according to traffic and scheduling conditions or channel conditions with base stations, RRC signaling must be used, so not only a long delay time but also a sufficiently flexible application may not be possible. Accordingly, the base station may transmit MAC signaling instructing the terminal to activate/deactivate the RMR(s) so that several RMRs are configured for the terminal and some of the RMR(s) may be selected. For example, RMR (s) may be indicated to the terminal using index (s).

Method 1-20: The UE may be instructed to activate or deactivate specific RMRs using MAC CE.

2 Reception of PDCCH

The UE can detect the PDCCH(s) using the time resource indicated as the search space set and the frequency resource indicated as the CORESET. Time resources of the search space set configured for the UE may be limited to DL symbols indicated by RRC signaling. When full duplex is applied, time resources of the search space set may be extended to DL resources indicated to the UE by RRC signaling. Here, the DL resources may include RB(s) (or subbands) capable of DL reception in SD symbols or SBFD symbols as well as DL symbols.

Method 2-1: Even in an SD symbol, a DL resource to which a PDCCH candidate (or CCE) can be mapped can be set by RRC signaling or indicated by DCI format.

Even if the time resource for receiving the search space set by the UE is extended to DL resources configured (or indicated) to the UE using RRC signaling or DCI format, the type of the corresponding search space set may be limited. That is, the type of search space set received in the corresponding DL resource may be limited to only the USS set or limited to the USS set and some types of CSS sets. Alternatively, search space sets of all types may be received in a corresponding DL resource.

Method 2-2: In Method 2-1, when reception of some types of CSS sets is allowed in DL resources configured (or indicated) using RRC signaling or DCI format to the terminal, reception of Type-3 CSS sets It may be allowed in DL resources configured (or indicated) using RRC signaling or DCI format to the UE.

In the Type-0/-0A/-1/-2 CSS set, scheduling information for system information required when the terminal performs initial access, cell search, or camping is received. can Therefore, it is preferable that the Type-0/-0A/-1/-2 CSS set does not depend on duplex directions of slots and subbands. On the other hand, since only some terminal(s) can observe the Type-3 CSS set according to the allocated RNTI, reception of the Type-3 CSS set can be allowed at least in DL resources configured by RRC signaling to the terminal.

Meanwhile, reception may be impossible in some resources of SS set and CORESET according to the indicated duplex direction.

8 to 10 are conceptual diagrams illustrating cases in which some resources of CORESET are not received. 8 and 9 show a case in which one CORESET is associated with any one CSS set, and FIG. 10 shows a case in which one or more CORESETs are associated with any one CSS set.

Referring to FIG. 8, a terminal can receive a CSS set only in a time resource capable of receiving a CSS set. According to the prior art standard, since the CSS set and the CORESET correspond to each other, the PDCCH candidate can be decoded by receiving the CORESET at the symbol observed in the CSS set (that is, when all subcarriers mean DL resources). When a CSS set and a CORESET associated therewith are not received by duplex direction, the terminal may not observe the CSS set and the CORESET. Methods 2-9 will be described in more detail.

Referring to FIG. 9, a CSS set is associated with one CORESET and can be received from a DL resource. One CORESET may be configured by gathering one or more contiguous frequency resources. With respect to a CSS set and CORESETs related thereto, PDCCH candidates can be decoded by observing CSS sets and CORESETs in some CORESETs that can be received through a duplex direction. The method of interpreting the part of the receivable CORESET will be described in more detail in method 2-10.

Referring to FIG. 10, a CSS set may be associated with one or more CORESETs (CORESET 1 and CORESET 2 or alternate CORESET or alternative CORESET). If CORESET 1 can be received in a certain DL resource, the terminal can decode the PDCCH candidate mapped in CORESET 1 to observe the CSS set. If it is impossible to receive all or part of CORESET 1 in the DL resource, the terminal can decode the PDCCH candidate mapped in CORESET 2 to observe the CSS set. Here, CORESET 2 must be able to be received in the DL resource. By extending this method, CORESETs related to CSS sets can be sequentially changed. It is associated with a CSS set and several CORESETs, and must be signaled to the terminal so that the order of these CORESETs can be derived.

Referring to FIGS. 8 to 10 , processing methods for SS set overbooking and REG bundle reception for CSS set and CORESET must be specified.

2.1 How to support SS set overbooking

According to the conventional technical standard, a portion of USS sets may be dropped in a corresponding serving cell when operating with only one serving cell or in a PCell when operating through carrier aggregation.

The UE can assume that all CSS sets are received, and the UE determines the number of PDCCHs that the UE can receive (i.e., number of PDCCH candidates for monitoring per span or per slot) and the number of CCEs that can be received by the UE (ie, number of non-overlapped CCEs per span or per slot), some USS set(s) may not be received.

When coresetPoolIndex is set, according to the conventional standard, a terminal may not receive some USS sets only in USS sets associated with a CORESET having coresetPoolIndex of 0 (ie, first CORESET). In other cases, USS set(s) must be configured for the UE so that the number of receivable PDCCHs and the number of receivable CCEs according to the capability of the UE do not exceed. The number of receivable PDCCHs and the number of receivable CCEs according to the capability of the UE may be determined based on the capability of the UE and the numerology of an active DL BWP.

In a system in which DL resources are changed according to the duplex direction, the number of PDCCHs and/or CCEs that can be received by the UE may decrease. In this case, the terminal may not be able to receive a part of the configured search space set.

For example, a part of the search space set that the terminal cannot receive may be determined by the type of the corresponding search space set.

Method 2-3: Part of PCell's Type-3 CSS set and part of USS set may not be received.

Method 2-4: Part of SCell's USS set may not be received.

Method 2-5: In Method 2-3 and/or Method 2-4, part of the SS set associated with the first CORESET or part of the SS set associated with the first CORESET and the second CORESET may not be received.

When a CSS set is configured in the SCell, method 2-3 may also be applied to the SCell. When a CSS set is configured in the PCell, it can be assumed that the terminal can always receive the Type-0/-0A/-1/-2 CSS set. Since the Type-3 CSS set can be identified by the RNTI, the terminal applies a predetermined priority to the RNTI, receives only the CSS set associated with the RNTI corresponding to the high priority, and CSS associated with the RNTI corresponding to the low priority. set can be assumed not to receive.

Alternatively, a part of the search space set may be identified by an identifier (ID).

Method 2-6: Parts of the search space set may be received in descending order of IDs assigned to the parts. That is, a part of the search space set to which a lower ID is assigned may be preferentially received.

Method 2-7: In method 2-6, a part of the search space set associated with the first CORESET or a part of the search space set associated with the first CORESET and the second CORESET may not be received.

)와 PDCCH candidate들의 개수 (

)을 제외하고, 나머지 CCE들의 개수(

)와 PDCCH candidate들의 개수(

)에 대해서만 SS set의 일부가 수신될지 여부가 결정될 수 있다.If part of the search space set is not received, the number of CCEs allocated to the SS set that the terminal should receive (

) and the number of PDCCH candidates (

), the number of remaining CCEs (

) and the number of PDCCH candidates (

), it may be determined whether a part of the SS set is received.

2.2 How to support REG bundle and DM-RS

A frequency resource of one CORESET set to the terminal may be discontinuous. Consecutive RBs to which CCEs are mapped form an RB set, and a CORESET may consist of two or more RB sets. Since the duplex directions are different, two or more RB sets may be divided into a set of RBs in which part of the CORESET is received and a set of RBs in which part of the CORESET is not received.

Method 2-8: The UE may assume that all RBs belonging to CORESET can always be received.

When the base station determines the duplex gap and/or guard time, the frequency resource and/or time resource of CORESET set to the UE(s) and the duplex gap and/or guard time do not always overlap with the frequency resource and/or time resource of CORESET. and duplex gap and/or guard time can be set. At this time, method 2-8 may be applied. However, since the base station may not satisfy these conditions, a method for receiving only part of the CORESET is required.

Method 2-9: If some of the CORESETs received by the UE are unavailable REs, the UE may not receive all of the CORESETs.

Here, unavailable REs mean REs that cannot receive a DL signal/channel due to a duplex gap or guard time. Available REs refer to REs capable of receiving a DL signal/channel. In order to follow Method 2-9, the base station preferably sets CORESET to the terminal so that unavailable REs do not occur.

When part of the CORESET set by the base station to the terminal is unavailable, some of the REGs constituting the REG bundle may not be valid. Alternatively, some of the REs constituting the REG bundle may be invalid. In this case, the terminal can utilize only valid REG(s) in one REG bundle. The reason is that if the REG is configured with only valid REs, the number of REs constituting the REG is reduced. This may affect BLER performance according to DCI rate matching. Similarly, if a REG bundle is configured with only valid REGs, the number of REGs constituting the REG bundle is reduced, and BLER performance according to DCI rate matching may be affected.

Since it is assumed that the same precoding is applied to REGs constituting one REG bundle, if invalid REGs are excluded from the REG bundle, channel estimation is performed using only a smaller number of REGs. do. Similarly, if unavailable REs among REs constituting one REG are excluded from the REG, channel estimation is performed using only a smaller number of REs. Also, a change may be required in the mapping of the DM-RS.

Therefore, as exemplified in FIG. 11 to be described later, it is preferable that a unit received by a terminal in an effective resource is a REG bundle. A CCE is configured only with valid REG bundles, and a mapping method between a REG bundle and a CCE and a mapping method between a CCE and a PDCCH candidate may follow a conventional method.

Method 2-10: If part of the CORESET received by the terminal is an invalid resource, the terminal may assume that CCEs are mapped only to REG bundles determined to be valid.

11 is a conceptual diagram for explaining an example of indexing for REG bundles mapped to valid resources.

와 REG bundle

은 유효하지 않은 RE들 때문에 연속적인 주파수 자원을 갖지 못한다. 이 때, 유효하지 않은 RE들을 가지는 REG에 대해서, DM-RS를 수신하는 동작이 더욱 구체화될 수 있다.Referring to FIG. 11 , REG bundles may be indexed in order from a low frequency to a high frequency. REG bundle

and REG bundle

does not have contiguous frequency resources due to invalid REs. At this time, for REGs having invalid REs, an operation of receiving a DM-RS may be further specified.

Method 2-11: In method 2-10, when some REs belonging to the REG are not valid, the UE may assume that the DM-RS is not mapped to the remaining REs belonging to the corresponding REG.

A UE may not receive a DM-RS in an invalid REG. The reason is that since the terminal performs channel estimation in units of REG bundles, the gain of joint channel estimation is reduced when REG bundles are composed of REGs in which time and/or frequency resources are discontinuously arranged. . Therefore, according to method 2-11, the terminal may not utilize an invalid REG.

Method 2-11 has the advantage of simplified operation, but has the disadvantage that REGs excluded from utilization due to the inclusion of invalid REs are not utilized for CORESET nor utilized for PDSCH. Mapping the DCI to an unused REG is not desirable for the above reasons, but a benefit may be obtained when combined channel estimation is performed by mapping only the DM-RS to the unused REG.

Method 2-12: In Method 2-10, even if some REs belonging to the REG are not valid, DM-RSs are mapped to the remaining REs belonging to the REG, and the corresponding DM-RSs can be received by the UE. At this time, it can be assumed that the same precoding as the adjacent REG bundle is applied to the DM-RS.

12 is a conceptual diagram for explaining an example of utilizing a REG having invalid REs.

에 인접한 REG(즉, 유효하지 않은 자원)에 DM-RS가 맵핑될 수 있다. 단말은 REG bundle

에 대해서, 보다 많은 DM-RS들을 이용하여 결합 채널 추정을 수행할 수 있다. 마찬가지로, 단말은 REG bundle

에 인접한 REG에도 DM-RS가 맵핑됨을 가정할 수 있다. 반면, REG bundle에 속한 REG에서만 DM-RS를 활용하는 경우는, 도 11에서 예시된 바와 같이 종래의 기술 규격을 그대로 활용할 수 있다.Referring to Figure 12, REG bundle

A DM-RS may be mapped to a REG (ie, an invalid resource) adjacent to . Terminal REG bundle

For , combined channel estimation can be performed using more DM-RSs. Similarly, the terminal is REG bundle

It can be assumed that the DM-RS is also mapped to the REG adjacent to . On the other hand, when the DM-RS is used only in REGs belonging to the REG bundle, the conventional technical standards can be used as they are as illustrated in FIG. 11 .

Method 2-13: Application of either method 2-11 or method 2-12 may be indicated by RRC signaling to the UE. Alternatively, without separate signaling, the UE may perform only one of Methods 2-11 and 2-12.

A sequence constituting the DM-RS may be generated using conventional technical specifications as they are. The UE may assume that at least the DM-RS sequence is not received in the RE(s) overlapping the duplex gap and/or the guard time. The above methods can be used both when precoderGranularity is indicated as sameAsREG-bundle and when precoderGranularity is indicated as allContiguousRBs .

Referring to FIG. 13, when REG bundles form one CCE, this means the order of giving REG bundles. Indexes may be first assigned to REG bundles in order of time (ie, symbol indexes of REG bundles), and indexes may be given in order of frequencies (ie, RB indexes of REG bundles).

Some REG bundles constituting the same CCE may not be received due to duplex direction. According to methods 2-10 to 2-13, the REG bundle may be reflected in the configuration of the CCE only when it is determined to be valid. Accordingly, even if the order of REG bundles is adjacent, symbols and/or RBs of REG bundles may not be adjacent to each other.

Transmission of 3 PUSCH

Upon receiving the scheduling DCI, the UE must be able to obtain sufficient information to receive the PDSCH or transmit the PUSCH from the received scheduling DCI. When the subband duplex is changed, information about the change of the subband duplex should be indicated to the UE through scheduling DCI.

According to the conventional technical specification, signaling instructing the UE to perform PDSCH rate matching and signaling instructing the UE to perform PUSCH rate matching are different.

In the case of PDSCH rate matching, several patterns may be configured for each BWP by RRC signaling to the UE. It is assumed that set patterns occur periodically and one pattern indicated using scheduling DCI is actually applied to PDSCH rate matching. One pattern can be expressed as one bitmap or a union of two bitmaps. Each bitmap may represent different periods and different time/frequency resources. The bitmap may be set to the UE through RRC signaling. For example, the parameter(s) setting the bitmap may be rateMatchPatternGroup or rateMatchPatternGroup1 and rateMatchPatternGroup2 .

A resource on which an SS/PBCH block is received may be set to the UE through RRC signaling. For example, the parameter(s) to set this may be ssb-PositionInBurst .

When a CORESET is received, the PDSCH rate matching method differs according to the setting of the precoder granularity of the corresponding CORESET. In the case of CORESET in which precoderGranularity is set to sameAsREG-bundle , only PDCCH and PDCCH DM-RS including scheduling DCI can be used in PDSCH rate matching. In the case of CORESET in which precoderGranularity is set to allContinuousRBs , DM-RSs mapped to all REGs belonging to CORESET can be used in PDSCH rate matching.

ZP-CSI-RS or LTE CRS can be utilized in PDSCH rate matching. When PDSCH is allocated by non-fallback DCI, aperiodic ZP-CSI-RS can be triggered, which can be used in PDSCH rate matching. On the other hand, when PDSCH is allocated by fallback DCI, PDSCH RE may be mapped regardless of ZP-CSI-RS or LTE CRS.

Rate matching may also be applied to uplink. In order to widen the coverage area of the PUSCH, the PUSCH may be repeatedly transmitted. PUSCH repetition type A or PUSCH repetition type B may be configured for RRC signaling to the UE. For convenience of description, when PUSCH repetition type B is indicated, all PUSCH transmissions are represented by a PUSCH occasion, and each PUSCH repetition is represented by a PUSCH instance.

PUSCH instances are further divided into nominal PUSCH instances transmitted in resources allocated by DCI or RRC signaling and actual PUSCH instances transmitted only in some resources. An actual PUSCH instance has an independent DM-RS and may have an independent RV.

In the case of transmitting the configured grant PUSCH, the UE may transmit the PUSCH in resources allocated through scheduling DCI or RRC signaling. Here, in order to derive resources capable of transmitting the PUSCH, the UE may need to consider separate DCI or RRC signaling for SD symbol(s) in addition to group common DCI (eg, DCI format 2_0, format 2_4).

The boundaries of actual PUSCH instances may be slot boundaries, DL symbols, or FL symbols. This can be derived only by RRC signaling (eg, numberOfInvalidSymbolsForDL-UL-Switching) or by applying a predetermined pattern that occurs periodically. Depending on DCI or RRC signaling allocating PUSCH repetition type B, a predetermined pattern may not be applied. For example, the predetermined pattern may be indicated by invalidSymbolPattern of RRC signaling.

As described above, PUSCH rate matching is applied in units of symbols and is applied only when it is set to repetition type B. In other cases, that is, in the case of repetition type A or single transmission, PUSCH (instance) is dropped. Invalid symbol pattern or rate matching resource pattern so that PUSCH rate matching is also applied to single transmission of PUSCH and PUSCH occasion. A method of instructing should be introduced. The corresponding pattern may be instructed (or set) to the UE by scheduling DCI and/or activating DCI and/or RRC signaling.

Method 3-1: A resource to which data is not mapped may be indicated in PUSCH transmission.

An invalid resource that cannot perform UL transmission to the UE may be indicated by RRC signaling and / or DCI. Alternatively, a rate matching resource pattern may be instructed to the UE through scheduling DCI (or group common DCI), and the UE may apply the corresponding pattern to rate matching. Scheduled resource and invalid resource may overlap in some RE(s). In this case, the UE may map UCI and/or TB only to REs in which scheduled resource and invalid resource do not overlap.

Method 3-2: In method 3-1, rate matching may be applied in units of symbols and units of RBs in all PUSCH instances.

Method 3-3: In method 3-1, InvalidSymbolPattern can be extended to subband. To this end, patterns utilized in PDSCH rate matching may be reused.

According to conventional technical specifications, such PUSCH (instance) is not transmitted, or an actual PUSCH instance is transmitted together with a DM-RS using only symbols that do not belong to invalid resources. If the DM-RS cannot be transmitted, the actual PUSCH instance may not be transmitted.

According to the proposed methods (methods 3-2 and 3-3), the terminal can exclude resources overlapping with invalid resources in units of RBs. The UE can map PUSCH data using resources that are not excluded.

However, it is preferable that data is mapped using consecutive RBs and symbols among resources other than invalid resources. Considering a situation in which any one frequency hop of PUSCH (instance) is divided into two or more contiguous resources by an invalid resource, the method of dividing into two or more is not unique and several methods may be considered.

14 is a conceptual diagram for explaining an example of interpreting the same resource as three consecutive resources, and FIG. 15 is a conceptual diagram for explaining another example of interpreting the same resource as three consecutive resources.

Referring to FIG. 14, among two or more contiguous resources divided by an invalid resource, a terminal may select a resource having a large region in the time domain. Referring to FIG. 15, among two or more contiguous resources divided by an invalid resource, a terminal may select a resource having a large region in the frequency domain. In this case, in order to increase the transmission amount, it is preferable for the terminal to select one resource having a larger number of REs. However, since it is complicated to calculate all of these combinations, the base station can prevent these resources from being generated.

Method 3-4: The UE may assume that only one contiguous resource is determined from resources other than an invalid resource, otherwise the UE may not transmit PUSCH (instance).

In one example, when the UE performs rate matching, it may be assumed that the UE performs only symbol-level rate matching or only RB-level rate matching. That is, when symbol-level rate matching is applied, PUSCH is transmitted in a scheduled bandwidth, but may be transmitted only in some consecutive symbols. That is, when RB-level rate matching is applied, PUSCH is transmitted in scheduled symbols, but may be transmitted only in some consecutive RBs.

In general, when allocating a PUSCH (instance), it may have more symbols than an invalid resource or may not have a wider bandwidth. Therefore, when excluding invalid resources, the UE may not divide any one frequency hop of PUSCH (instance) into discontinuous resources. In this case, for one frequency hop of PUSCH (instance), a resource having a constant bandwidth may be selected from consecutive symbols.

16 is a conceptual diagram for explaining an example of performing PUSCH rate matching according to an invalid resource.

Referring to FIG. 16, a bandwidth may be uniformly limited regardless of a symbol belonging to any one frequency hop of a scheduled PUSCH (instance). In this case, when performing frequency hopping, each frequency hop belonging to the same PUSCH (instance) may have different bandwidths.

Method 3-5: In the case of a PUSCH to which frequency hopping is applied, the number of RBs of the ^1st hop and the number of RBs of the ^2nd hop may differ from each other due to an invalid resource.

17 is a conceptual diagram for explaining an example in which actual PUSCH instances are classified according to invalid resources.

Referring to FIG. 17, in a frequency hop of a scheduled PUSCH (instance), when a constant bandwidth 1 is applied to a certain symbol (s) and a constant bandwidth 2 is applied to another symbol (s), bandwidth 1 and bandwidth 2 are can be different In this case, since the bandwidth is different, it is preferable for the base station to estimate the channel by differently mapping the DM-RS for each bandwidth.

Method 3-6: PUSCH (instance) allocated to the UE may be divided into actual PUSCH (instance) when the bandwidth is changed, except for invalid resources.

In the case of a PUSCH to which frequency hopping is applied, an RB index starting with any one frequency hop of the PUSCH (instance) may be recalculated while being classified as an actual PUSCH (instance). In this case, the example of FIG. 17 may not be applied. This is because the ^2nd RB index of actual PUSCH instance1 may be different from the ^1st RB index of actual PUSCH instance2 because the frequency resource of PUSCH can be composed of two RB indices.

When the UE performs PUSCH rate matching, UCI and/or TB are mapped and DM-RS is mapped. To support this, a method for determining the size of TB, a method for mapping DM-RS, and a method for determining UCI rate matching are required.

The UE may not perform PUSCH rate matching. In this case, when the UE fails to perform UL transmission in the resource for which the PUSCH is scheduled, the UE may drop the corresponding PUSCH. According to the conventional technical specifications, PUSCH can be transmitted in semi-static UL symbols, configured PUSCH is not allowed to be transmitted in semi-static FL symbols, but dynamic PUSCH can be transmitted in FL symbols. That is, when dynamic SFI is not set, PUSCH can be transmitted even in a semi-static FL symbol, and when dynamic SFI is set, PUSCH can be transmitted in dynamic UL.

Method 3-7: When the UE can distinguish DL/FL/UL for each sub-band, the PUSCH can be transmitted when UL transmission is allowed in all resources of the PUSCH belonging to the SD symbol.

3.1 Transform precoding application method

A waveform configured for PUSCH transmission may be cyclic prefix (CP)-OFDM or DFT-s-OFDM. The waveform may be determined depending on whether transform precoding is additionally applied. For example, a DFT-s-OFDM waveform may be generated when transform precoding is additionally applied, and a CP-OFDM waveform may be generated when transform precoding is not applied.

The bandwidth for applying transform precoding is limited, and transform precoding can be applied to RBs that are multiples of 2, 3, and 5. Therefore, if PUSCH (instance) is transmitted only in a part of the bandwidth due to an invalid resource, it may be difficult to keep the above-described bandwidth restriction for transform precoding. Therefore, PUSCH rate matching can be applied only when the CP-OFDM waveform is used.

Method 3-8: Rate matching may be performed only on the PUSCH transmitted in the CP-OFDM waveform.

In one example, the UE may perform rate matching only when the PUSCH is transmitted in a CP-OFDM waveform. As another example, when PUSCH (instance) is rate-matched to have a narrow bandwidth, PUSCH (instance) may be restricted to have multiple RBs of 2, 3, and 5. In this case, the largest number allowed among multiples of 2, 3, and 5 is derived. This may correspond to the bandwidth of PUSCH to which rate matching is applied.

Method 3-9: In order to perform rate matching on a PUSCH transmitted in a DFT-s-OFDM waveform, the number of RBs of the PUSCH may be limited to a multiple of 2, 3, or 5.

A method of generating/mapping a DM-RS when a CP-OFDM waveform is used is different from a method of generating/mapping a DM-RS when a DFT-s-OFDM waveform is used. The UE may map DM-RS for each actual PUSCH instance. In the process of performing PUSCH rate matching, some bandwidths overlap with invalid resources and may be excluded. In this case, the DM-RS should be mapped only to a narrower bandwidth than the DM-RS allocated to the UE.

When the PUSCH waveform is set to CP-OFDM, the DM-RS sequence may be mapped based on pointA. That is, the UE may generate a DM-RS assuming that PUSCH rate matching is not performed, and map the DM-RS only to RBs to which PUSCH (instance) is mapped.

When the waveform of PUSCH is set to DFT-s-OFDM, the sequence of DM-RS can be mapped only to scheduled RBs. That is, the UE may determine the required DM-RS sequence length, modulate the DM-RS sequence, and map the DM-RS sequence to REs in consideration of performing PUSCH rate matching.

Accordingly, the length of the DM-RS is determined by the bandwidth through which the PUSCH is transmitted, and according to method 3-5, the length of the DM-RS may vary for each frequency hopping.

3.2 How to determine the size of TB

When rate matching is applied to PUSCH, the size of TB for PUSCH of single transmission may be determined based on the amount of scheduled resources. Similarly, when set to repetition type A or repetition type B, the size of TB may be determined by the amount of scheduled resources.

However, when the resource of the PUSCH is determined by scheduling DCI, the rate matching resource (or invalid resource) is reflected when determining the number of REs allocated to the UE, and TB based on the number of REs actually available for transmission size can be determined. In addition, even in the case of configured grant PUSCH, the size of TB may be determined by reflecting a rate matching resource (or invalid resource).

Method 3-10: When the UE performs repetitive transmission of PUSCH, the size of TB may be determined by reflecting a rate matching resource.

3.3 How to determine the size of transmit power

The UE may determine transmission power applied to the PUSCH based on the amount of scheduled resources. According to the conventional technical specifications, the transmit power of the PUSCH remains the same in all REs of the PUSCH and is determined regardless of frequency hopping.

Therefore, when rate matching is applied and the bandwidth is changed, a method for determining power applied to any one frequency hop of a PUSCH (instance) is required. It is advantageous for phase continuity that the transmission power is maintained as it is. When the transmission power is changed, noise may occur in some OFDM samples during the time required for changing the transmission power.

Method 3-11: Transmission power of PUSCH may be determined regardless of PUSCH rate matching.

개인 경우, 전송 전력에는

이 반영될 수 있다. 따라서, rate matching이 수행되어 RB들의 개수가

으로 변경되면, 전송 전력을 결정하는 수식에도

이 반영될 수 있다.When the bandwidth of the PUSCH is changed, transmission power is changed according to conventional technical standards. For example, the number of RBs of scheduled PUSCH

In the case of an individual, the transmission power has

this can be reflected. Therefore, rate matching is performed so that the number of RBs

When changed to , the formula for determining the transmit power also

this can be reflected.

이 반영될 수 있다. PUSCH의 첫번째 홉(1^st hop)과 두번째 홉(2^nd hop)은 서로 다른 대역폭들을 가질 수 있지만, 그 전송 전력들은 같도록 유지될 수 있다. 이러한 경우, PUSCH의 첫번째 홉(1^st hop)의 EPRE과 두번째 홉(2^nd hop)의 EPRE는 서로 달라질 수 있다. 따라서, PUSCH의 각 홉에 대해서, 기지국이 얻는 수신 SINR이 홉마다 달라질 수 있다. 또한 PUSCH의 홉마다 대역폭을 가질 수 있으므로, DM-RS에 적용되는 시퀀스의 길이가 달라야 한다. 따라서 DM-RS는 첫번째 홉(1^st hop)과 두번째 홉(2^nd hop)에서 서로 다른 파라메터를 갖는 것이 바람직하다.According to method 3-11, when determining transmit power even when the number of RBs is changed,

this can be reflected. The first hop (1st ^hop ) and the second hop ( ^2nd hop) of the PUSCH may have different bandwidths, but their transmit powers may be kept the same. In this case, the EPRE of the first hop ( ^1st hop) of the PUSCH and the EPRE of the second hop ( ^2nd hop) may be different from each other. Therefore, for each hop of the PUSCH, the received SINR obtained by the base station may be different for each hop. In addition, since each hop of the PUSCH may have a bandwidth, the length of the sequence applied to the DM-RS should be different. Therefore, the DM-RS preferably has different parameters in the first hop (1st ^hop ) and the second hop ( ^2nd hop).

개인 경우, 전송 전력에는

이 반영될 수 있다. 여기서, TBS는 TB에 속한 RE들의 개수일 수 있다. 따라서, rate matching이 수행되는 경우, RE들의 개수가

으로 변경되면, 전송 전력을 결정하는 수식에도

이 반영될 수 있다.As another setting variable for determining transmission power, the number of REs may be used. According to the conventional technical standard, it is possible to set the transmission power to increase when the number of REs increases. For example, deltaMCS can be enabled. In this case, the number of REs may depend on the result of rate matching. For example, the scheduled PUSCH includes at least TB, and the number of REs is

In the case of an individual, the transmission power has

this can be reflected. Here, TBS may be the number of REs belonging to TB. Therefore, when rate matching is performed, the number of REs

When changed to , the formula for determining the transmit power also

this can be reflected.

이 반영될 수 있다.According to the proposed method 3-11, when determining transmit power even when the number of REs is changed,

this can be reflected.

3.4 How to report transmit power margin

The result of rate matching may have an effect not only when determining transmit power of the PUSCH but also when generating a power headroom report. However, according to method 3-11, the result of rate matching may not affect the generation of the power headroom report.

When generating the Type1 power headroom report, the UE may generate the Type1 power headroom report for actual transmission or for a reference format.

According to the conventional technical specifications, the terminal can report the power reserve to the base station using the PHR MAC CE. The PHR MAC CE may be a single entry PHR MAC CE or a multiple entry PHR MAC CE according to a MAC subheader. When multiple entry PHR MAC CE is used, whether the power headroom report is generated for actual transmission or reference format can be reported to the base station using one bit.

Method 3-12: When power headroom for actual transmission is derived, power headroom in which rate matching is reflected may be derived.

3.5 UCI rate matching method

The UE may transmit only the PUSCH without simultaneously transmitting the PUCCH and the PUSCH, but may multiplex the UCI to be included in the PUCCH to the PUSCH. When frequency hopping is applied to the PUSCH, the UE may perform UCI rate matching and map coded data (ie, coded TB) to other REs.

PUSCH to which frequency hopping is applied may be considered. According to conventional technical specifications, hops of PUSCH may have the same number of REs. Accordingly, rate matching is performed by considering half the number of REs to which the encoded UCI is mapped.

개의 RE들과

개의 RE들을 가지는 경우, 이들의 상대적인 비율인

(이하,

)과

(이하,

)가 계산될 수 있다. 그러므로, 부호화된 UCI가 PUSCH의 첫번?? 홉(1^st hop)에 맵핑되는 양과 PUSCH의 두번째 홉(2^nd hop)에서 맵핑되는 양을 결정할 때, 상기 비율이 반영될 수 있다.However, when PUSCH rate matching is performed and the first hop (1 ^st hop) and the second hop (2 ^nd hop) of the PUSCH have different numbers of REs, the coded UCI may not be divided in half. For example, the first hop (1st ^hop ) and the second hop ( ^2nd hop) of the PUSCH are

with two REs

In the case of having two REs, their relative ratio

(Below,

)class

(Below,

) can be calculated. Therefore, the coded UCI is the first ?? of the PUSCH. When determining the amount mapped to the ^1st hop and the amount mapped to the ^2nd hop of the PUSCH, the ratio may be reflected.

비트로 표현되는 UCI가 PUSCH 홉들에 매핑되는 양(

)은

과

으로 결정될 수 있다. Method 3-13:

The amount of UCI represented by bits mapped to PUSCH hops (

)silver

class

can be determined by

가 정의되며,

성립될 수 있다. 여기서,

는 전송에 이용되는 전송 레이어들(layer)의 개수이며,

는 PUSCH에 적용하는 변조율일 수 있다. 다른 예로, PUSCH with UL-SCH일 때,

가 정의되며,

가 성립될 수 있다. 여기서 UCI는 HARQ-ACK, CSI part1, 또는 CSI part2일 수 있다.For example, when PUSCH with UL-SCH,

is defined,

can be accomplished here,

Is the number of transport layers used for transmission,

may be a modulation rate applied to the PUSCH. As another example, when PUSCH with UL-SCH,

is defined,

can be achieved. Here, UCI may be HARQ-ACK, CSI part1, or CSI part2.

3.6 Interpretation method of available slot counting

When PUSCH repetition typeA is indicated, the terminal may determine available slots to transmit the PUSCH. Regarding the repetition factor (K) indicated to the terminal, since the terminal transmits the PUSCH only in some slots among K consecutive slots, the number of actually transmitted repetitions may be less than K. Alternatively, the terminal may select slots through which the PUSCH is transmitted such that the number of transmitted repetitions is K.

Here, the slot in which PUSCH repetition is not transmitted is a slot in which a DL symbol belonging to a slot format indicated by RRC signaling ( tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated ) to the UE and a scheduled PUSCH overlap and SS/PBCH block indicated to the UE by RRC signaling ( ssb-PositionsInBurst ) and a scheduled PUSCH may mean a slot overlapping.

According to the conventional technical specifications, valid slots are determined by slot format except for symbols configured to receive DL signals/channels. Therefore, if a UL signal/channel can be transmitted in a part of a DL (or SD) symbol according to embodiments of the present invention, the above-described criteria must be changed.

Method 3-14: When the UE transmits the PUSCH (repeatedly), if the UL signal/channel can be transmitted even in the DL (or SD) symbol, the UE selects an effective slot based on whether the scheduled PUSCH can be transmitted can decide

Similarly, the same method can be applied to reception of a DL signal/channel.

Method 3-15: When the terminal receives the PDSCH (repeatedly), if the DL signal / channel can be received even in the UL (or SD) symbol, the terminal is effective based on whether the scheduled PDSCH can be received slots can be determined.

An index of a redundancy version (RV) mapped to a PDSCH repetition or a PUSCH repetition may be determined based on a valid slot.

Reception of 4 DL RS

The base station can schedule DL transmission and UL reception in different frequency resources in the same symbol (subband full duplex). In this case, cross link interference may occur in the same frequency resource due to DL and UL misalignment between adjacent base stations. In addition, while a UE performs UL transmission, it may act as interference to DL reception of another UE.

In this case, the terminal may derive transmission power applied to the same symbol differently from the conventional method in order to reduce interference with other terminals. In addition, the base station may allocate transmission power applied to the same symbol differently from the conventional method.

Method 4-1: When deriving a DL EPRE, a separate power offset may be applied to a symbol (SD symbol) to which subband duplex is applied.

For example, when the transmission power of the SS/PBCH block is set by RRC signaling, one or more values may be set to the UE. Here, one value may be applied to DL symbols or FL symbols, and another value may be applied to SD symbols.

For example, when power applied to transmission of CSI-RS is set by RRC signaling, one or more offsets for transmission power of an SS/PBCH block may be set to the UE. Here, one value may be applied to DL symbols or FL symbols, and another value may be applied to SD symbols.

Method 4-2: It may be assumed that the SS/PBCH block providing a reference for transmit power of CSI-RS received in SD symbol is transmitted in DL symbol or FL symbol.

On the other hand, the UE can distinguish SD symbols and non-SD symbols (DL symbols, FL symbols, or UL symbols) for L1 measurement or L3 measurement derived using the SS / PBCH block and / or CSI-RS can When reporting a measurement result to the base station, a measurement target symbol may be reported. Measurement values obtained by the measurement may be received signal reference power (RSRP) and/or signal-to-interference-plus-noise ratio (SINR).

Measurement resources may be composed of specific symbols and specific subcarriers.

Method 4-3: A set of measurement resources is configured separately through RRC signaling to the UE, and measurement and reporting may be independently performed for each measurement resource.

For example, measurement resource 1 and measurement resource 2 may be configured for the terminal. Measurement resource 1 may consist of DL/FL symbols, and measurement resource 2 may consist of SD symbols. Even when using the same DL-RS (SS/PBCH block and/or CSI-RS), if they belong to different measurement resources, the UE may not utilize them for L1 filtering or L3 filtering. This is because the transmission power (or EPRE) of the base station may be different for each measurement resource, and the reception power may also be different for each measurement resource.

The UE may report the measurement result for measurement resource 1 and/or the measurement result for measurement resource 2 to the base station. In one example, the measurement result for measurement resource 2 may always be reported together with the measurement result for measurement resource 1.

Method 4-4: When two or more measurement resources are configured for the UE, for the same DL-RS, the measurement result for one measurement resource (eg, measurement resource 2) is determined by another measurement resource (eg, measurement resource It can always be reported together with the measurement results for 1).

Method 4-5: In method 4-4, the measurement result for measurement resource 2 may be derived as a relative difference value based on the measurement result for measurement resource 1 and reported to the base station.

When the UE performs reporting on two or more measurement resources, one measurement resource may be used as a reference and only a relative value of a measurement result of the corresponding measurement resource may be reported to the base station. Thus, the number of bits required for reporting can be reduced.

The DL-RS may be received only on some subcarriers belonging to the symbol and frequency resources indicated to the UE to receive the DL-RS. For example, according to FIG. 4 described above, subcarriers allowed for UL transmission may be located between subcarriers for DL reception. In this case, DL-RS may not be received on some subcarrier(s) of BWP.

Method 4-6: If the DL-RS is not received in the time and frequency resources indicated to the UE through the RB set, RMR, or SFI, the UE can receive subcarriers belonging to the corresponding frequency resource by puncturing there is.

When the UE receives the CSI-RS, the CSI-RS may be used for CSI feedback. Alternatively, CSI-RS may be utilized for beam management and/or tracking.

In the case of CSI-RS for tracking (eg, tracking reference signal (TRS)), if some subcarriers are not received in one TRS symbol, the UE may not use the same subcarriers in the other TRS symbol. there is. Preferably, the UE uses subcarriers received in all symbols of the TRS.

In the case of CSI feedback, a CSI report (eg, CQI, PMI, RI, etc.) may be derived from a CSI reference resource. The frequency domain and time domain of the CSI reference resource are determined, and a valid DL slot is defined, and CSI reporting must be performed prior to a slot corresponding to a predetermined time (eg, nCSI_ref) or the corresponding slot.

DL-RS can be utilized to estimate pathloss. When the UE receives a DL-RS (or part of the DL-RS) in an SD symbol, the UE must use only subcarriers capable of DL reception in order to calculate a path loss. The terminal must be able to correct the transmit power instructed by the base station in advance.

Transmission of 5 UL RS

When the UE transmits the SRS or PRACH, if UL transmission is not allowed in some resources, the UE may not transmit all or part of the SRS or PRACH.

The UE may be instructed not to use some of the time and/or frequency resources in which the UE intends to transmit the SRS for UL transmission. For example, this is because the UE cannot transmit SRS in resources not indicated as UL or FL in a specific subband.

Hereinafter, periodic/semi-persistent SRS and aperiodic SRS are separately described because their transmission methods are different.

Method 5-1: In the case of periodic or semi-persistent SRS, the UE may drop the SRS in an area indicated as DL (or, in a specific case, FL).

Method 5-2: In case of Aperiodic SRS, SRS is not transmitted in a region indicated by DL (or, in a specific case, FL), but can be transmitted in the first resource in which SRS transmission is possible.

Aperiodic SRS may be triggered by DCI format reception. The UE may derive the resource through which the SRS is transmitted after a predetermined time has elapsed from the time when the transmission of the aperiodic SRS is triggered from the formula defined in the technical standard. Since the time at which the SRS is transmitted to the UE is not explicitly indicated, the UE can select the first transmission-capable resource among resources derived from the formula. Here, the first meaning may mean the most preceding in time.

Transmission of 6 PRACH

The UE may select a RACH occasion (RO) associated with the SS/PBCH block in order to transmit PRACH for initial access. Here, RO should be composed of UL symbols. Accordingly, the UE may derive UL symbols from a common pattern (eg, tdd-UL-DL-ConfigurationCommon ) indicated by SIB1 (or RRC signaling). The terminal may determine an RO not configured with symbols indicated as semi-static UL symbols according to the common pattern as an invalid RO.

When the UE performs contention free random access (CFRA), the UE can derive a valid RO based on the PDCCH order and transmit PRACH in the derived RO. Since the UE is in an RRC connection established state, it may be instructed not only the common slot pattern but also the dedicated slot pattern (eg, tdd-UL-DL-ConfigurationDedicated ) and receive dynamic SFI. In addition, the terminal can also receive information indicating DL or UL for each sub-band from the base station.

For example, when the terminal receives DCI format 1_0, if the received DCI format 1_0 satisfies a specific condition (eg, all FDRA fields are configured as 1), the terminal interprets the DCI as a PDCCH order rather than a scheduling DCI. can In this case, the terminal may interpret the information field of the received DCI format for the purpose of PDCCH order.

The PDCCH order indicates a random access preamble index, an SS/PBCH block index, and a PRACH mask index, and the UE can derive one resource using them. That is, the UE can derive one or more ROs using the indicated SS/PBCH block index and select one RO using the indicated PRACH mask index. In addition, the UE can transmit the PRACH in the selected RO using the indicated preamble index.

Method 6-1: The validity of the RO can be determined using only a common slot pattern and/or a dedicated slot pattern. That is, the UE can use the derived slot pattern only through RRC signaling.

Method 6-2: The UE derives a pattern of symbols using both the slot pattern and dynamic SFI derived by RRC signaling, and UL symbol (s) (and / or FL symbol (s) and / or SD symbol (s) ), the effectiveness of RO can be judged.

In the methods described above, RO can still be derived from resources determined to be UL (or FL or SD or non-DL) in all sub-bands. When the UE establishes an RRC connection, it is preferable that RO can be derived even from resources determined to be UL (and/or FL) only in some partial band(s).

Method 6-3: If a resource belonging to an RO is determined to be UL (and/or FL) even in an SD symbol according to the capability of the UE, the corresponding RO may be regarded as a valid RO.

In order to assign a number to the RO, the UE can derive a valid resource not only from the semi-static UL symbol but also from the SD symbol. If the UE receives the PDCCH order, when interpreting the PRACH mask, an effective RO number may be assigned by considering SD symbols and UL (and/or FL) symbols.

7 Priority of reception and transmission

According to the conventional method, in a symbol indicated as FL by RRC signaling (tdd-UL-DL-ConfigurationCommon and/or tdd-UL-DL-ConfigurationDedicated ) to the UE, the UE configured transmission (eg, periodic SRS, semi- Persistent SRS, transmission of CG PUSCH) and / or configured reception (eg, reception of SPS PDSCH, periodic CSI-RS, semi-persistent CSI-RS) may not be performed.

When DL and UL coexist in a partial band, when SD symbols are allocated separately, and when UL transmission is allowed on some subcarriers of a DL symbol or DL reception is allowed on some subcarriers of a UL symbol. For this, the full duplex operation of the terminal may be different.

In one example, a UE performing an operation in which duplex may be different for each sub-band performs DL reception and UL transmission in one active BWP, or active DL BWP and active UL BWP coexist in the same symbol can be assumed to do. Alternatively, the UE receives enhanced SFI (ie, a dynamic signal or channel indicating DL or UL for each sub-band) and confirms that the resource of the DL signal / channel and / or the resource of the UL signal / channel are valid. . Here, the DL signal/channel and/or the UL signal/channel may be scheduled in DCI format or allocated through RRC signaling.

18 is a conceptual diagram for explaining an example in which a full duplex operation is performed for one terminal in one carrier.

Referring to FIG. 18, a UE can receive a DL signal/channel and transmit a UL signal/channel. These may overlap each other in time. The UE may perform both DL reception and UL transmission or only one of DL reception and UL transmission.

According to the conventional method, even if the terminal supports the function of full duplex, since one active BWP is used in one carrier, only one of reception or transmission can be performed. According to the proposed method, a terminal can perform both reception and transmission in one carrier.

Method 7-1: In one carrier, the UE can perform both reception and transmission in symbols where the DL signal/channel and the UL signal/channel overlap.

Method 7-2: The terminal may transmit capability information for full duplex operation in one carrier to the base station.

The terminal can perform both reception and transmission according to the settings of the base station.

19 is another conceptual diagram for explaining an example in which a full duplex operation for one terminal is performed in one carrier.

Referring to FIG. 19, a base station may perform scheduling so that a DL signal/channel and a UL signal/channel temporally overlap each other. Since the terminal reports the capability for full duplex operation to the base station, the scheduling may be regarded as valid scheduling.

In one example, since the UE has full duplex capability, priority indices (eg, high priority) or low priority ( Reception and transmission can be performed regardless of low priority)).

When the SPS PDSCH and the CG PUSCH overlap in the same symbol, the UE may receive the SPS PDSCH and transmit the CG PUSCH according to capabilities.

When the PUSCH allocated in DCI format 0_x and the SPS PDSDCH overlap in the same symbol, the UE may receive the SPS PDSCH and transmit the PUSCH according to capability.

When the PDSCH allocated in DCI format 1_y and the CG PUSCH overlap in the same symbol, the UE may receive the PDSCH and transmit the CG PUSCH according to capability.

When the PUSCH allocated in DCI format 0_x and the PDSCH allocated in DCI format 1_y overlap in the same symbol, the UE may receive the PDSCH and transmit the CG PUSCH according to capability.

In another proposed method, the terminal can perform only reception or transmission in one carrier.

Method 7-3: Reception or transmission indicated in DCI format may be performed.

20 is a conceptual diagram for explaining an example in which one UE performs only a part of DL reception for UL transmission in one carrier, and FIG. It is a conceptual diagram for explaining an example in which only a part is performed.

Referring to FIG. 20, when DCI format 0_x (UL grant) and higher layer signaling (DL grant, eg, SPS) are considered, the UE may transmit a UL signal/channel according to DCI format 0_x. Referring to FIG. 21, when DCI format 1_y (DL grant) and higher layer signaling (UL grant) are considered, the UE can receive a DL signal/channel according to DCI format 1_y.

Here, the unselected DL signal/channel and/or UL signal/channel may be canceled. All or part of a DL signal/channel or a UL signal/channel to be canceled may be canceled after a predetermined time elapses from the last symbol of the CORESET including the DCI format received from the terminal.

Method 7-4: Priority indices are compared, and reception or transmission corresponding to a higher priority may be performed.

Unlike method 7-3, this means that a signal/channel allocated through higher layer signaling can be transmitted. In addition, even when the configured DL signal / channel and the configured UL signal / channel overlap each other, either one may be selected according to the priority indices. Here, a signal/channel for which a priority index is not indicated may be interpreted as having a low priority.

Method 7-5: In method 7-4, when the DL signal/channel and the UL signal/channel are interpreted as having the same priority index, the signal/channel that is received or transmitted first in time may be selected.

A DL signal/channel may be repeatedly received or a UL signal/channel may be repeatedly transmitted. In this case, the above methods may be applied for each repetition. In this case, repetitions that have not been transmitted may be counted as transmitted.

When the UE is configured to select an available slot, the UE may check whether the slot format is capable of transmitting the PUSCH and additionally check whether transmission is possible for each sub-band. If the PUSCH can be transmitted in a slot format indicated by RRC signaling and/or SFI, the UE can transmit the PUSCH. In addition, even if transmission of PUSCH is not allowed according to the slot format, when PUSCH can be transmitted according to a duplex pattern according to a subband indicated by RRC signaling and/or enhanced SFI, the UE can transmit PUSCH.

8 How to generate HARQ-ACK codebook

When the UE is instructed to feedback HARQ-ACK in the same (sub)slot or when the PUCCHs instructed to the UE temporally overlap each other, the UE generates one HARQ codebook by arranging HARQ-ACK bits in a predetermined order. can

HARQ codebooks can be classified into various types, and one type can be indicated to the UE by RRC signaling. In the case of Type1 HARQ codebook, Type3 HARQ codebook, and enhanced Type3 HARQ codebook, the size of the HARQ codebook depends on RRC signaling. Therefore, even if the terminal misses scheduling DCI, the size of the HARQ codebook may not be changed. However, the terminal may have to maintain the size of the HARQ codebook by generating unnecessary HARQ-ACK.

Meanwhile, since the Type2 HARQ codebook includes only HARQ-ACK for the PDSCH allocated by scheduling DCI, the size of the HARQ codebook may vary. In order to prevent this, an additional information field may be added to the scheduling DCI and may be used for estimating the number of scheduling DCIs.

If the UE can receive the PDSCH even in the SD symbol, at least the size of the Type1 HARQ codebook may be affected. The size of the Type 1 HARQ codebook may be determined regardless of whether scheduling DCI is received or not, but may be affected by reception of group common DCI (ie, dynamic SFI). According to the proposed method, the size of the Type 1 HARQ codebook can also be affected by whether or not the UE can receive the PDSCH in the SD symbol.

If the information indicating the SD symbol is included in the group common DCI, the terminal can use this to determine the size of the Type 1 HARQ codebook.

In active DL BWP, TDRA index and K1 index may be indicated to the UE. In the K1 set indicated to the UE by RRC signaling, any one value may be indicated to the UE as a K1 index. In the TDRA table indicated to the UE by RRC signaling, one value may be indicated to the UE as a TDRA index.

Here, several K1 sets may be indicated to the UE by RRC signaling, and the UE may derive one K1 set as an intersection, union, or difference of the K1 sets. For example, when a terminal receives a multicast PDSCH, a K1 set for multicast PDSCH and an existing K1 set for unicast PDSCH may be separately configured for the terminal. In this case, the K1 set may be derived as the union, difference, or intersection of these sets according to the operating mode of the terminal.

According to the conventional technical specification, the UE does not include in the HARQ codebook HARQ-ACK for a PDSCH candidate expected to have been received before a change in active DL BWP or a change in active UL BWP of a serving cell for transmitting PUCCH. may not be

When part of the SD symbol is interpreted as DL/FL/UL, a case in which the bandwidth of the DL sub-band and/or the UL sub-band is changed according to the instruction of the base station may be additionally considered. If this is interpreted as a change in BWP, according to conventional technical specifications, HARQ-ACK for PDSCH candidate may not be included in the HARQ codebook. In the proposed method, the validity of the PDSCH candidate may not be interpreted as a change in BWP. That is, even if the bandwidth interpretation of the SD symbol is changed, the HARQ-ACK for the previously received PDSCH candidate can be included in the HARQ codebook.

Method 8-1: When a part of an SD symbol is interpreted as DL/FL/UL and the bandwidth of the DL/FL/UL sub-band is changed, the HARQ-ACK for the previously generated PDSCH candidate is included in the HARQ codebook. can

The UE may determine a method of determining when the PDSCH (or one of PDSCH repetition(s)) derived based on the TDRA is valid in consideration of the SD symbol.

According to the conventional technical specification, when repeated PDSCH transmission is instructed to the UE, the UE predicts that it will receive PDSCH repetitions in consecutive slots, but if RRC signaling (i.e., tdd-UL -DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated ), if there is a symbol set to UL, the terminal may not include HARQ-ACK for PDSCH repetitions derived from the corresponding TDRA in the HARQ codebook.

If a scenario in which some of the SD symbols can be interpreted as DL/FL/UL is considered, it is not desirable to determine the validity of the PDSCH repetition in units of symbols as in the conventional technical standard. In the proposed method, the validity of PDSCH repetition can be determined in units of REs.

Method 8-2: If some of the SD symbols can be interpreted as DL/FL/UL and DL reception is allowed in all REs belonging to the PDSCH (repetition), PDSCHs (repetitions) derived from the corresponding TDRA HARQ-ACKs for may be included in the HARQ codebook.

The methods according to the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium. Computer readable media may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on a computer readable medium may be specially designed and configured for the present invention or may be known and usable to those skilled in computer software.

Examples of computer readable media include hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter or the like as well as machine language codes generated by a compiler. The hardware device described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

Although described with reference to the above embodiments, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the present invention described in the claims below. You will be able to.

Claims (20)

As a subband duplex (SD) operation method performed by a terminal,
Receiving slot pattern information for a slot from a base station;
receiving information on at least one partial band from the base station; and
Performing uplink transmission and / or downlink reception with the base station in the at least one sub-band belonging to at least one SD symbol belonging to the slot,
How to operate sub-band duplex. The method of claim 1,
The slot pattern information is received by radio resource control (RRC) signaling or a combination of the RRC signaling and downlink control information (DCI),
How to operate sub-band duplex. The method of claim 1,
The at least one SD symbol is a continuous FL (flexible) symbol located between a downlink (DL) symbol and an uplink (UL) symbol in the slot,
How to operate sub-band duplex. The method of claim 1,
The at least one SD symbol is consecutive symbols located between a DL symbol and a UL symbol in the slot (at least one DL symbol and at least one FL symbol) or (at least one FL symbol and at least one UL symbol ), consisting of
How to operate sub-band duplex. The method of claim 1,
Information on the at least one sub-band is received through group common DCI, UE-specific DCI, or RRC signaling,
How to operate sub-band duplex. The method of claim 1,
The information on the at least one sub-band is limitedly applied to the at least one SD symbol,
How to operate sub-band duplex. The method of claim 1,
Further comprising receiving information on a first symbol set and a second symbol set of the slot from the base station,
The information on the at least one sub-band includes information on a first sub-band and a second sub-band, the first sub-band is applied to the first symbol set, and the second sub-band is applied to the second symbol set. applied to the set,
How to operate sub-band duplex. The method of claim 7,
The terminal performs DL reception in the first sub-band and performs UL transmission in the second sub-band,
How to operate sub-band duplex. The method of claim 8,
A guard band exists between the first sub-band and the second sub-band,
How to operate sub-band duplex. The method of claim 1,
The information on the at least one sub-band includes information on a resource block (RB) set corresponding to each of the at least one sub-band,
How to operate sub-band duplex. The method of claim 10,
The RB set is indicated by a starting RB index and an ending RB index, or indicated by a starting RB index and the number of RBs constituting the RB set,
How to operate sub-band duplex. The method of claim 1,
Receiving information about the at least one sub-band
Receiving information on a plurality of sub-bands through RRC signaling; and
Receiving a media access control (MAC) control element (CE) activating the at least one sub-band among the plurality of sub-bands,
How to operate sub-band duplex. As a subband duplex (SD) operation method performed by a base station,
Transmitting slot pattern information for a slot to a terminal;
Transmitting information on at least one partial band to the terminal; and
Performing uplink reception and / or downlink transmission with the terminal in the at least one sub-band belonging to at least one SD symbol belonging to the slot,
How to operate sub-band duplex. The method of claim 13,
The at least one SD symbol is a continuous FL (flexible) symbol located between a downlink (DL) symbol and an uplink (UL) symbol in the slot,
How to operate sub-band duplex. The method of claim 13,
The at least one SD symbol is consecutive symbols located between a DL symbol and a UL symbol in the slot (at least one DL symbol and at least one FL symbol) or (at least one FL symbol and at least one UL symbol ), consisting of
How to operate sub-band duplex. The method of claim 13,
Further comprising transmitting information about a first symbol set and a second symbol set of the slot to the terminal,
The information on the at least one sub-band includes information on a first sub-band and a second sub-band, the first sub-band is applied to the first symbol set, and the second sub-band is applied to the second symbol set. applied to the set,
How to operate sub-band duplex. The method of claim 16
The base station performs DL transmission in the first sub-band and performs UL reception in the second sub-band.
How to operate sub-band duplex. As a subband duplex (SD) operation method performed by a terminal,
Receiving setting information for CORESET from a base station;
determining whether at least a portion of the CORESET is unavailable; and
When it is determined that at least a part of the CORESET is unavailable, under the assumption that control channel elements (control channel elements, CCEs) are mapped only to valid resource element group (REG) bundle(s) belonging to the CORESET, the valid REG bundle ( s) monitoring a downlink control channel (physical downlink control channel),
How to operate sub-band duplex. The method of claim 18
At least a part of the CORESET is resource elements (REs) in which the downlink (DL) reception operation of the terminal is impossible due to a duplex gap or guard time according to the partial band duplex operation sign,
How to operate sub-band duplex. The method of claim 19
The valid REG bundle(s) are REG bundle(s) that do not include resource elements in which the DL reception operation of the terminal is impossible,
How to operate sub-band duplex.

Images