Method and device for random access in communication system supporting sbfd

Abstract

A method of a user equipment (UE) comprises the steps of: receiving, from a base station, subband full duplex (SBFD) random access (RA) configuration information; determining an initial random access channel (RACH) occasion (RO) type as a legacy RO or an additional RO on the basis of information included in the SBFD RA configuration information; and transmitting, to the base station, an RA preamble in the legacy RO or the additional RO determined as the initial RO type.

Description

Method and device for random access in a communication system supporting SBFD

[0001] The present disclosure relates to an improved communication technology, and more specifically, to a technology for random access in a communication system that supports SBFD (subband full duplex).

[0002] Communication networks (e.g., 5G communication networks, 6G communication networks, etc.) are being developed to provide communication services that are improved over existing communication networks (e.g., LTE (long term evolution), LTE-A (advanced), etc.). 5G communication networks (e.g., NR (new radio) communication networks) can support frequency bands above 6 GHz as well as frequency bands below 6 GHz. That is, 5G communication networks can support the FR1 band and / or FR2 band. 5G communication networks can support a wider variety of communication services and scenarios compared to LTE communication networks. For example, usage scenarios for 5G communication networks may include eMBB (enhanced Mobile BroadBand), URLLC (Ultra Reliable Low Latency Communication), mMTC (massive Machine Type Communication), etc.

[0003] 6G communication networks can support a wider variety of communication services and scenarios compared to 5G communication networks. 6G communication networks can meet the requirements for ultra-high performance, ultra-bandwidth, ultra-spatial, ultra-precision, ultra-intelligence, and / or ultra-reliability. 6G communication networks can support a wide range of frequency bands and can be applied to various usage scenarios (e.g., terrestrial communication, non-terrestrial communication, sidelink communication, etc.).

[0004] Meanwhile, communication networks can support SBFD (subband full duplex) operation. Random access (RA) procedures can be performed in communication networks that support SBFD. Random access channel (RACH) resources can be configured on different symbol types (e.g., SBFD symbols or N(non)-SBFD symbols). In this case, a method for the RA procedure is required. Furthermore, since RACH power control was designed based on an N-SBFD environment, a method for RACH power control in an SBFD environment is required.

[0005] The purpose of the present disclosure to solve problems such as those described above is to provide a method and apparatus for random access in a communication system that supports SBFD (subband full duplex).

[0006] A method of user equipment (UE) according to embodiments of the present disclosure for achieving the above objective comprises: receiving subband full duplex (SBFD) random access (RA) setting information from a base station; determining an initial RACH (random access channel) occasion type as a legacy RO or an additional RO based on information included in the SBFD RA setting information; and transmitting an RA preamble from the legacy RO or the additional RO determined as the initial RO type to the base station, wherein the legacy RO is set in an N(non)-SBFD resource and the additional RO is set in at least one of the SBFD resource or the N-SBFD resource.

[0007] The above SBFD RA setting information may include at least one of an SBFD RO type indicating the initial RO type, an SBFD RSRP (reference signal received power) threshold for determining the initial RO type, an SBFD RSRP threshold for determining the initial RO type, or the maximum number of transmissions of the RA preamble in the same RO type.

[0008] The step of determining the initial RO type as a legacy RO or an additional RO may include the step of determining the initial RO type as the legacy RO based on the fact that the SBFD RA setting information includes an SBFD RO type indicating the initial RO type, and that the SBFD RO type indicates the legacy RO.

[0009] The step of determining the above initial RO type as a legacy RO or an additional RO is,

[0010] The above SBFD RA setting information may include an SBFD RO type indicating the above initial RO type, and based on the fact that the SBFD RO type indicates the above additional RO, the method may include a step of determining the above initial RO type as the above additional RO.

[0011] The step of determining the initial RO type as a legacy RO or an additional RO may include: determining the initial RO type as the additional RO based on the fact that the RSRP measured in the UE is smaller than the SBFD RSRP threshold, based on the fact that the SBFD RA setting information does not include an SBFD RO type indicating the initial RO type, and the SBFD RA setting information includes an SBFD RSRP threshold and an SBFD RSRP threshold usage for determining the initial RO type, and the SBFD RSRP threshold usage is set to below; and determining the initial RO type as the legacy RO based on the fact that the RSRP measured in the UE is not smaller than the SBFD RSRP threshold.

[0012] The measured RSRP above may be the measurement result of the PL-RS (pathloss reference signal) received from the base station.

[0013] The step of determining the initial RO type as a legacy RO or an additional RO may include: determining the initial RO type as the additional RO based on the fact that the RSRP measured in the UE is greater than the SBFD RSRP threshold, based on the fact that the SBFD RA setting information does not include an SBFD RO type indicating the initial RO type, and the SBFD RA setting information includes an SBFD RSRP threshold and an SBFD RSRP threshold usage for determining the initial RO type, and the SBFD RSRP threshold usage is set to above; and determining the initial RO type as the legacy RO based on the fact that the RSRP measured in the UE is not greater than the SBFD RSRP threshold.

[0014] The method of the UE may further include the step of retransmitting the RA preamble to the base station when the transmission of the RA preamble fails; the step of switching the initial RO type to another RO type based on the fact that the number of transmissions of the RA preamble has reached the maximum number of transmissions indicated by the information included in the SBFD RA setting information; and the step of retransmitting the RA preamble to the base station in the other RO type, wherein the maximum number of transmissions may indicate the maximum number of transmissions of the RA preamble in the same RO type.

[0015] The step of switching the initial RO type to another RO type may include switching the RO type for RA preamble transmission from the legacy RO to the additional RO, based on the fact that the initial RO type is the legacy RO, there exists an additional RO that supports the same function or combination of functions associated with the legacy RO, and there exists an additional RO that supports a number of repetitions set greater than or equal to the number of repetitions of the RA preamble associated with the legacy RO.

[0016] The step of switching the initial RO type may include switching the RO type for RA preamble transmission from the additional RO to the legacy RO, based on the fact that the initial RO type is the additional RO, there exists a legacy RO that supports the same function or combination of functions associated with the additional RO, and there exists a legacy RO that supports a number of repetitions set greater than or equal to the number of repetitions of the RA preamble associated with the additional RO.

[0017] User equipment (UE) according to embodiments of the present disclosure for achieving the above objective comprises at least one processor, wherein the at least one processor causes the UE to receive subband full duplex (SBFD) random access (RA) setting information from a base station; determine an initial RACH (random access channel) occasion type as a legacy RO or an additional RO based on information included in the SBFD RA setting information; and cause an RA preamble to be transmitted to the base station from the legacy RO or the additional RO determined as the initial RO type, wherein the legacy RO is set in an N(non)-SBFD resource and the additional RO is set in at least one of the SBFD resource or the N-SBFD resource.

[0018] The above SBFD RA setting information may include at least one of an SBFD RO type indicating the initial RO type, an SBFD RSRP (reference signal received power) threshold for determining the initial RO type, an SBFD RSRP threshold for determining the initial RO type, or the maximum number of transmissions of the RA preamble in the same RO type.

[0019] In a procedure for determining the initial RO type as a legacy RO or an additional RO, the at least one processor may cause the UE to determine the initial RO type as the legacy RO based on the fact that the SBFD RA configuration information includes an SBFD RO type that indicates the initial RO type, and that the SBFD RO type indicates the legacy RO.

[0020] In a procedure for determining the initial RO type as a legacy RO or an additional RO, the at least one processor may cause the UE to determine the initial RO type as the additional RO based on the fact that the SBFD RA setting information includes an SBFD RO type that indicates the initial RO type, and that the SBFD RO type indicates the additional RO.

[0021] In a procedure for determining the initial RO type as a legacy RO or an additional RO, the at least one processor may cause the UE to determine the initial RO type as the additional RO based on the fact that the RSRP measured in the UE is less than the SBFD RSRP threshold, based on the fact that the SBFD RA setting information does not include an SBFD RO type indicating the initial RO type, and the SBFD RA setting information includes an SBFD RSRP threshold and an SBFD RSRP threshold usage for determining the initial RO type, and the SBFD RSRP threshold usage is set to below; and to determine the initial RO type as the legacy RO based on the fact that the RSRP measured in the UE is not less than the SBFD RSRP threshold.

[0022] The measured RSRP above may be the measurement result of the PL-RS (pathloss reference signal) received from the base station.

[0023] In a procedure for determining the initial RO type as a legacy RO or an additional RO, the at least one processor may cause the UE to determine the initial RO type as the additional RO based on the fact that the RSRP measured in the UE is greater than the SBFD RSRP threshold, based on the fact that the SBFD RA setting information does not include an SBFD RO type indicating the initial RO type, and the SBFD RA setting information includes an SBFD RSRP threshold and an SBFD RSRP threshold usage for determining the initial RO type, and the SBFD RSRP threshold usage is set to above; and to determine the initial RO type as the legacy RO based on the fact that the RSRP measured in the UE is not greater than the SBFD RSRP threshold.

[0024] The at least one processor may cause the UE to retransmit the RA preamble to the base station if the transmission of the RA preamble fails; switch the initial RO type to another RO type based on the fact that the number of transmissions of the RA preamble has reached the maximum number of transmissions indicated by the information included in the SBFD RA setting information; and further cause the RA preamble to be retransmitted to the base station in the other RO type, wherein the maximum number of transmissions may indicate the maximum number of transmissions of the RA preamble in the same RO type.

[0025] In the procedure for switching the initial RO type to another RO type, the at least one processor may cause the UE to switch the RO type for RA preamble transmission from the legacy RO to the additional RO, based on the fact that the initial RO type is the legacy RO, there exists an additional RO that supports the same function or combination of functions associated with the legacy RO, and there exists an additional RO that supports a number of repetitions set greater than or equal to the number of repetitions of the RA preamble associated with the legacy RO.

[0026] In a procedure for switching the initial RO type to another RO type, the at least one processor may cause the UE to switch the RO type for RA preamble transmission from the additional RO to the legacy RO based on the fact that the initial RO type is the additional RO, there exists a legacy RO that supports the same function or combination of functions associated with the additional RO, and there exists a legacy RO that supports a number of repetitions set greater than or equal to the number of repetitions of the RA preamble associated with the additional RO.

[0027] According to the present disclosure, in a communication system supporting subband full duplex (SBFD) operation, a terminal can perform a random access channel (RACH) procedure by selecting a suitable RO among the random access channel (RACH) occasions set for different symbol types. Different transmit power settings may be applied for each RO type, and an RA procedure (e.g., an initial RA procedure) reflecting the difference in link characteristics between SBFD symbols and N(non)-SBFD symbols may be performed. The terminal can select an adjacent RO type or select an RO type according to preset conditions, and accordingly, the delay of the RA procedure may be reduced. When the RO type changes during the retransmission of the RA preamble, the transmit power ramping rule is maintained or adjusted, thereby enabling stable retransmission without abrupt changes in transmit power. By controlling the transmit power for each RO type, the RA procedure can be performed while maintaining fairness between the SBFD terminal and the N-SBFD terminal. The uncertainty of the transmission power of msg3 can be resolved by controlling the transmission power of msg3 by considering the transmission of the RA preamble in different RO types.

[0028] FIG. 1 is a conceptual diagram illustrating embodiments of a communication system.

[0029] FIG. 2 is a block diagram illustrating embodiments of communication nodes constituting a communication system.

[0030] FIG. 3 is a block diagram illustrating embodiments of communication nodes performing communication.

[0031] FIG. 4a is a block diagram illustrating embodiments of a transmission path.

[0032] FIG. 4b is a block diagram illustrating embodiments of a receiving path.

[0033] FIG. 5 is a conceptual diagram illustrating embodiments of a system frame in a communication system.

[0034] FIG. 6 is a conceptual diagram illustrating embodiments of subframes in a communication system.

[0035] FIG. 7 is a conceptual diagram illustrating embodiments of slots in a communication system.

[0036] FIG. 8 is a conceptual diagram illustrating embodiments of time-frequency resources in a communication system.

[0037] Figure 9 is a flowchart illustrating the RA procedure.

[0038] The present disclosure is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present disclosure to specific embodiments and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present disclosure.

[0039] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" may mean a combination of a plurality of related described items or any of a plurality of related described items.

[0040] In the present disclosure, "at least one of A and B" may mean "at least one of A or B" or "at least one of one or more combinations of A and B". Additionally, in the present disclosure, "at least one of A and B" may mean "at least one of A or B" or "at least one of one or more combinations of A and B".

[0041] In the present disclosure, (re)transmission may mean "transmission," "retransmission," or "transmission and retransmission"; (re)setting may mean "setting," "resetting," or "setting and resetting"; (re)connection may mean "connection," "reconnection," or "connection and reconnection"; and (re)connection may mean "connection," "reconnection," or "connection and reconnection".

[0042] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0043] The terms used in this disclosure are used merely to describe specific embodiments and are not intended to limit this disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this disclosure, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0044] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which this disclosure pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this disclosure.

[0045] Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the attached drawings. To facilitate overall understanding in describing the present disclosure, the same reference numerals are used for identical components in the drawings, and redundant descriptions of identical components are omitted. Operations according to combinations of embodiments, extensions of embodiments, and / or modifications of embodiments may be performed, as well as the embodiments explicitly described in the present disclosure. The performance of some operations may be omitted, and the order of operations may be changed.

[0046] In the embodiments, even when a method performed at a first communication node among the communication nodes (e.g., transmission or reception of a signal) is described, the corresponding second communication node may perform a method corresponding to the method performed at the first communication node (e.g., reception or transmission of a signal). That is, when the operation of a UE (user equipment) is described, the corresponding base station may perform an operation corresponding to the operation of the UE. Conversely, when the operation of a base station is described, the corresponding UE may perform an operation corresponding to the operation of the base station.

[0047] A base station may be referred to as Node B, evolved Node B, gNode B (next generation node B), gNB, device, apparatus, node, communication node, BTS (base transceiver station), RRH (radio remote head), TRP (transmission reception point), RU (radio unit), RSU (road side unit), radio transceiver, access point, access node, etc. A UE may be referred to as terminal, device, apparatus, node, communication node, end node, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, OBU (on board unit), etc.

[0048] In the present disclosure, signaling may be at least one of upper-layer signaling, MAC (medium access control) signaling, or PHY (physical) signaling. A message used for upper-layer signaling may be referred to as an "upper-layer message" or an "upper-layer signaling message." A message used for MAC signaling may be referred to as a "MAC message" or a "MAC signaling message." A message used for PHY signaling may be referred to as a "PHY message" or a "PHY signaling message." Upper-layer signaling may refer to the transmission and reception operations of system information (e.g., MIB (master information block), SIB (system information block)) and / or RRC (radio resource control) messages. MAC signaling may refer to the transmission and reception operations of MAC CE (control element). PHY signaling may refer to the transmission and reception operations of control information (e.g., DCI (downlink control information), UCI (uplink control information), SCI (sidelink control information)).

[0049] In the present disclosure, "setting an operation (e.g., a transmission operation)" may mean that "setting information for said operation (e.g., an information element, a parameter)" and / or "information directing the performance of said operation" is signaled. "Setting an information element (e.g., a parameter)" may mean that said information element is signaled. In the present disclosure, "signal and / or channel" may mean a signal, a channel, or "signal and channel," and "signal" may be used to mean "signal and / or channel." In the present disclosure, "time" and "time point" may be used interchangeably. "Time" may be interpreted as a time or a time point depending on the context, and "time point" may be interpreted as a time point or a time depending on the context.

[0050] In the present disclosure, a phrase containing "~ case (e.g., when ~)" may be expressed as a phrase containing "~ based on (e.g., based on ~)" or a phrase containing "~ in response to (e.g., in response to ~)". In other words, a phrase containing "~ case" may be interpreted as identical or similar to a phrase containing "~ based on" or a phrase containing "~ in response to".

[0051] The communication networks to which the embodiments are applied are not limited to those described below, and the embodiments may be applied to various communication networks (e.g., 4G communication networks, 5G communication networks, and / or 6G communication networks). Here, the term "communication network" may be used interchangeably with "communication system."

[0052] FIG. 1 is a conceptual diagram illustrating embodiments of a communication system.

[0053] Referring to FIG. 1, the communication system (100) may include 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). Additionally, the communication system (100) may further include a core network (e.g., an S-GW (serving-gateway), a P-GW (PDN (packet data network)-gateway), and an MME (mobility management entity)). If the communication system (100) is a 5G communication system (e.g., a new radio (NR) system), the core network may include an AMF (access and mobility management function), a UPF (user plane function), an SMF (session management function), etc.

[0054] Multiple communication nodes (110 to 130) can support communication protocols defined in 3GPP (3rd generation partnership project) standards (e.g., LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.). Multiple communication nodes (110 to 130) can support 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. Each of the multiple communication nodes may have the following structure.

[0055] FIG. 2 is a block diagram illustrating embodiments of communication nodes constituting a communication system.

[0056] Referring to FIG. 2, the communication node (200) may include at least one processor (210), a memory (220), and a transceiver (230) that is connected to a network to perform communication. Additionally, the communication node (200) may further include an input interface device (240), an output interface device (250), a storage device (260), etc. Each component included in the communication node (200) may be connected by a bus (270) to communicate with one another.

[0057] The processor (210) can execute a program command stored in at least one of the memory (220) and the storage device (260). The processor (210) may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the methods according to embodiments of the present disclosure are performed. Each of the memory (220) and the storage device (260) may be composed of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory (220) may be composed of at least one of read-only memory (ROM) and random access memory (RAM).

[0058] Referring again to FIG. 1, the communication system (100) may include a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) and 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 be located within 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 be located within 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 be located within the cell coverage of the third base station (110-3). The first terminal (130-1) may be located within the cell coverage of the fourth base station (120-1). The sixth terminal (130-6) may be located within the cell coverage of the fifth base station (120-2).

[0059] Here, each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be referred to as NB (NodeB), eNB (evolved NodeB), gNB, ABS (advanced base station), HR-BS (high reliability-base station), BTS (base transceiver station), radio base station, radio transceiver, access point, access node, RAS (radio access station), 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), RSU (road side unit), RRH (radio remote head), TP (transmission point), TRP (transmission and reception point), etc.

[0060] Each of the multiple terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) may be referred to as UE (user equipment), TE (terminal equipment), AMS (advanced mobile station), HR-MS (high reliability-mobile station), terminal, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, node, device, OBU (on board unit), etc.

[0061] Meanwhile, each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) may operate in different frequency bands or in the same frequency band. Each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be connected to each other via an ideal backhaul link or a non-ideal backhaul link, and may exchange information with each other via an ideal backhaul link or a non-ideal backhaul link. Each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be connected to a core network via an ideal backhaul link or a non-ideal backhaul link. Each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit a signal received from the core network to the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6), and can transmit a signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) to the core network.

[0062] In addition, each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) can support MIMO transmission (e.g., SU (single user)-MIMO, MU (multi user)-MIMO, massive MIMO, etc.), CoMP (coordinated multipoint) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, sidelink communication (e.g., D2D (device to device communication), ProSe (proximity services)), IoT (Internet of Things) communication, dual connectivity (DC), etc. Here, each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) can perform an operation corresponding to the base station (110-1, 110-2, 110-3, 120-1, 120-2) and an operation supported by the base station (110-1, 110-2, 110-3, 120-1, 120-2). For example, the second base station (110-2) can transmit a signal to the fourth terminal (130-4) based on the SU-MIMO method, and the fourth terminal (130-4) can receive a signal from the second base station (110-2) based on the SU-MIMO method. Alternatively, the second base station (110-2) can transmit a signal to the fourth terminal (130-4) and the fifth terminal (130-5) based on the MU-MIMO method, and each of the fourth terminal (130-4) and the fifth terminal (130-5) can receive a signal from the second base station (110-2) by the MU-MIMO method.

[0063] Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can transmit a signal to the fourth terminal (130-4) based on the CoMP method, and the fourth terminal (130-4) can receive a signal from the first base station (110-1), the second base station (110-2), and the third base station (110-3) by the CoMP method. Each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit and receive signals based on the CA method with terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) within its cell coverage area. Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can control sidelink communication 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) can perform sidelink communication by controlling each of the second base station (110-2) and the third base station (110-3).

[0064] Meanwhile, communication nodes performing communication in a communication network may be configured as follows. The communication node shown in FIG. 3 may be a specific embodiment of the communication node shown in FIG. 2.

[0065] FIG. 3 is a block diagram illustrating embodiments of communication nodes performing communication.

[0066] Referring to FIG. 3, the first communication node (300a) and the second communication node (300b) may each be a base station or a UE. The first communication node (300a) may transmit a signal to the second communication node (300b). A transmission processor (311) included in the first communication node (300a) may receive data (e.g., a data unit) from a data source (310). The transmission processor (311) may receive control information from a controller (316). The control information may include at least one of system information, RRC setting information (e.g., information set by RRC signaling), MAC control information (e.g., MAC CE), or PHY control information (e.g., DCI, SCI).

[0067] The transmitting processor (311) can generate data symbol(s) by performing processing operations on data (e.g., encoding operations, symbol mapping operations, etc.). The transmitting processor (311) can generate control symbol(s) by performing processing operations on control information (e.g., encoding operations, symbol mapping operations, etc.). Additionally, the transmitting processor (311) can generate synchronization / reference symbol(s) for synchronization signals and / or reference signals.

[0068] The Tx MIMO processor (312) can perform spatial processing operations (e.g., precoding operations) on data symbol(s), control symbol(s), and / or synchronization / reference symbol(s). The output of the Tx MIMO processor (312) (e.g., a symbol stream) can be provided to modulators (MODs) included in transceivers (313a to 313t). The modulators (MODs) can perform processing operations on the symbol stream to generate modulated symbols and perform additional processing operations on the modulated symbols (e.g., analog conversion operations, amplification operations, filtering operations, up-conversion operations) to generate signals. The signals generated by the modulators (MODs) of the transceivers (313a to 313t) can be transmitted through antennas (314a to 314t).

[0069] Signals transmitted by the first communication node (300a) can be received at the antennas (364a to 364r) of the second communication node (300b). Signals received at the antennas (364a to 364r) can be provided to demodulators (DEMODs) included in the transceivers (363a to 363r). The demodulators (DEMODs) can obtain samples by performing processing operations on the signals (e.g., filtering, amplification, down-conversion, digital conversion). The demodulators (DEMODs) can obtain symbols by performing additional processing operations on the samples. The MIMO detector (362) can perform MIMO detection operations on the symbols. The receiving processor (361) can perform processing operations on the symbols (e.g., deinterleaving, decoding). The output of the receiving processor (361) can be provided to the data sink (360) and the controller (366). For example, data can be provided to the data sink (360), and control information can be provided to the controller (366).

[0070] Meanwhile, the second communication node (300b) can transmit a signal to the first communication node (300a). The transmission processor (368) included in the second communication node (300b) can receive data (e.g., a data unit) from the data source (367) and can generate data symbol(s) by performing a processing operation on the data. The transmission processor (368) can receive control information from the controller (366) and can generate control symbol(s) by performing a processing operation on the control information. Additionally, the transmission processor (368) can generate reference symbol(s) by performing a processing operation on a reference signal.

[0071] The Tx MIMO processor (369) can perform spatial processing operations (e.g., precoding operations) on data symbol(s), control symbol(s), and / or reference symbol(s). The output of the Tx MIMO processor (369) (e.g., a symbol stream) can be provided to modulators (MODs) included in transceivers (363a to 363t). The modulators (MODs) can perform processing operations on the symbol stream to generate modulated symbols and perform additional processing operations on the modulated symbols (e.g., analog conversion operations, amplification operations, filtering operations, up-conversion operations) to generate signals. The signals generated by the modulators (MODs) of the transceivers (363a to 363t) can be transmitted through antennas (364a to 364t).

[0072] Signals transmitted by the second communication node (300b) can be received at the antennas (314a to 314r) of the first communication node (300a). Signals received at the antennas (314a to 314r) can be provided to demodulators (DEMODs) included in the transceivers (313a to 313r). The demodulators (DEMODs) can obtain samples by performing processing operations on the signals (e.g., filtering operation, amplification operation, down-conversion operation, digital conversion operation). The demodulators (DEMODs) can obtain symbols by performing additional processing operations on the samples. The MIMO detector (320) can perform MIMO detection operations on the symbols. The receiving processor (319) can perform processing operations on the symbols (e.g., deinterleaving operation, decoding operation). The output of the receiving processor (319) can be provided to the data sink (318) and the controller (316). For example, data can be provided to the data sink (318), and control information can be provided to the controller (316).

[0073] The memories (315 and 365) may store data, control information, and / or program code. The scheduler (317) may perform scheduling operations for communication. The processors (311, 312, 319, 361, 368, 369) and controllers (316, 366) shown in FIG. 3 may be the processor (210) shown in FIG. 2 and may be used to perform the methods described in this disclosure.

[0074] FIG. 4a is a block diagram illustrating embodiments of a transmission path, and FIG. 4b is a block diagram illustrating embodiments of a reception path.

[0075] Referring to FIGS. 4a and 4b, a transmission path (410) may be implemented at a communication node that transmits a signal, and a reception path (420) may be implemented at a communication node that receives a signal. The transmission path (410) may include a channel coding and modulation block (411), an S-to-P (serial-to-parallel) block (412), an N IFFT (Inverse Fast Fourier Transform) block (413), a P-to-S (parallel-to-serial) block (414), a CP (cyclic prefix) addition block (415), and an UC (up-converter) (UC) (416). The reception path (420) may include a DC (down-converter) (421), a CP removal block (422), an S-to-P block (423), an N FFT block (424), a P-to-S block (425), and a channel decoding and demodulation block (426). Here, N can be a natural number.

[0076] Information bits in the transmission path (410) can be input to the channel coding and modulation block (411). The channel coding and modulation block (411) can perform coding operations (e.g., LDPC (low-density parity check) (LDPC) coding operations, polar coding operations, etc.) and modulation operations (e.g., QPSK (Quadrature Phase Shift Keying), QAM (Quadrature Amplitude Modulation), etc.) on the information bits. The output of the channel coding and modulation block (411) may be a sequence of modulation symbols.

[0077] The S-to-P block (412) can convert modulated symbols in the frequency domain into parallel symbol streams to generate N parallel symbol streams. N can be the IFFT size or the FFT size. The N IFFT block (413) can generate signals in the time domain by performing an IFFT operation on the N parallel symbol streams. The P-to-S block (414) can convert the output of the N IFFT block (413) (e.g., parallel signals) into a serial signal to generate a serial signal.

[0078] The CP addition block (415) can insert CP into the signal. The UC (416) can up-convert the frequency of the output of the CP addition block (415) to an RF (radio frequency) frequency. Additionally, the output of the CP addition block (415) can be filtered in the baseband before up-conversion.

[0079] A signal transmitted from the transmission path (410) can be input to the reception path (420). The operation in the reception path (420) may be the inverse operation of the operation in the transmission path (410). The DC (421) may down-convert the frequency of the received signal to a baseband frequency. The CP removal block (422) may remove CP from the signal. The output of the CP removal block (422) may be a serial signal. The S-to-P block (423) may convert the serial signal into parallel signals. The N FFT block (424) may generate N parallel signals by performing an FFT algorithm. The P-to-S block (425) may convert the parallel signals into a sequence of modulation symbols. The channel decoding and demodulation block (426) may perform a demodulation operation on the modulation symbols and perform a decoding operation on the result of the demodulation operation to restore the data.

[0080] In FIGS. 4a and 4b, Discrete Fourier Transform (DFT) and Inverse DFT (IDFT) may be used instead of FFT and IFFT. In FIGS. 4a and 4b, each of the blocks (e.g., components) may be implemented by at least one of hardware, software, or firmware. For example, in FIGS. 4a and 4b, some blocks may be implemented by software, and the remaining blocks may be implemented by hardware or a "combination of hardware and software." In FIGS. 4a and 4b, one block may be subdivided into multiple blocks, multiple blocks may be integrated into one block, some blocks may be omitted, and blocks supporting other functions may be added.

[0081] FIG. 5 is a conceptual diagram illustrating embodiments of a system frame in a communication system.

[0082] Referring to FIG. 5, time resources in a communication system can be divided into frames. For example, system frames can be set consecutively in the time domain of the communication system. The length of a system frame can be 10 ms (millisecond). The system frame number (SFN) can be set from #0 to #1023. In this case, 1024 system frames can be repeated in the time domain of the communication system. For example, the SFN of a system frame after system frame #1023 can be #0.

[0083] A single system frame may contain two half frames. The length of a single half frame may be 5ms. A half frame located at the beginning of the system frame may be referred to as "Half Frame #0", and a half frame located at the end of the system frame may be referred to as "Half Frame #1". A system frame may contain 10 subframes. The length of a single subframe may be 1ms. Within a single system frame, the 10 subframes may be referred to as "Subframe #0-9".

[0084] FIG. 6 is a conceptual diagram illustrating embodiments of subframes in a communication system.

[0085] Referring to FIG. 6, one subframe may include n slots, where n is a natural number. Thus, one subframe may consist of one or more slots.

[0086] FIG. 7 is a conceptual diagram illustrating embodiments of slots in a communication system.

[0087] Referring to FIG. 7, a slot may contain one or more symbols. A slot illustrated in FIG. 7 may contain 14 symbols. The length of the slot may vary depending on the number of symbols included in the slot and the length of the symbols. Alternatively, the length of the slot may vary depending on the numerology.

[0088] Numerals applied to physical signals and channels in a communication system may be variable. Numerals may be variable to meet various technical requirements of the communication system. In a communication system where CP (cyclic prefix) based OFDM waveform technology is applied, numerals may include subcarrier spacing and CP length (or CP type). Table 1 may be a first embodiment of a method for configuring numerals for a CP-OFDM based communication system. Depending on the frequency band in which the communication system operates, at least some of the numerals in Table 1 may be supported. Additionally, numerals not listed in Table 1 may be further supported in the communication system.

[0089]

[0090] When the subcarrier spacing is 15 kHz (e.g., μ=0), the slot length may be 1 ms. In this case, one system frame may contain 10 slots. When the subcarrier spacing is 30 kHz (e.g., μ=1), the slot length may be 0.5 ms. In this case, one system frame may contain 20 slots.

[0091] When the subcarrier spacing is 60 kHz (e.g., μ=2), the slot length may be 0.25 ms. In this case, one system frame may contain 40 slots. When the subcarrier spacing is 120 kHz (e.g., μ=3), the slot length may be 0.125 ms. In this case, one system frame may contain 80 slots. When the subcarrier spacing is 240 kHz (e.g., μ=4), the slot length may be 0.0625 ms. In this case, one system frame may contain 160 slots.

[0092] The symbol can be set as a downlink (DL) symbol, a flexible (FL) symbol, or an uplink (UL) symbol. A slot consisting only of a DL symbol may be referred to as a "DL slot," a slot consisting only of an FL symbol may be referred to as an "FL slot," and a slot consisting only of a UL symbol may be referred to as an "UL slot."

[0093] The slot format can be semi-fixed by upper-layer signaling (e.g., RRC signaling). Information indicating the semi-fixed slot format may be included in system information, and the semi-fixed slot format can be set cell-specifically. Additionally, the semi-fixed slot format can be additionally set per terminal through terminal-specific upper-layer signaling (e.g., RRC signaling). The flexible symbols of the cell-specific slot format can be overridden as downlink symbols or uplink symbols by the terminal-specific upper-layer signaling. Furthermore, the slot format can be dynamically indicated by physical layer signaling (e.g., the SFI (slot format indicator) included in the DCI). The semi-fixed slot format can be overridden by the dynamically indicated slot format. For example, the semi-fixed flexible symbols can be overridden as downlink symbols or uplink symbols by the SFI.

[0094] The reference signal may be a CSI-RS (channel state information-reference signal), SRS (sounding reference signal), DM-RS (demodulation-reference signal), PT-RS (phase tracking-reference signal), etc. The channel may be a PBCH (physical broadcast channel), PDCCH (physical downlink control channel), PDSCH (physical downlink shared channel), PUCCH (physical uplink control channel), PUSCH (physical uplink shared channel), PSCCH (physical sidelink control channel), PSSCH (physical sidelink shared channel), etc. In the present disclosure, the control channel may mean PDCCH, PUCCH, or PSCCH, and the data channel may mean PDSCH, PUSCH, or PSSCH.

[0095] FIG. 8 is a conceptual diagram illustrating embodiments of time-frequency resources in a communication system.

[0096] Referring to FIG. 8, a resource consisting of one symbol (e.g., an OFDM symbol) in the time domain and one subcarrier in the frequency domain can be defined as a "RE (resource element)." A resource consisting of one OFDM symbol in the time domain and K subcarriers in the frequency domain can be defined as a "REG (resource element group)." A REG can include K REs. A REG can be used as the basic unit of resource allocation in the frequency domain. K can be a natural number. For example, K can be 12. N can be a natural number. In the slot illustrated in FIG. 7, N can be 14. N OFDM symbols can be used as the basic unit of resource allocation in the time domain.

[0097] In the present disclosure, RB may mean a common RB (CRB). Alternatively, RB may mean a PRB or a virtual RB (VRB). In a communication system, a CRB may mean an RB that constitutes a set of consecutive RBs (e.g., a common RB grid) based on a reference frequency (e.g., point A). A carrier and / or bandwidth portion may be placed on the common RB grid. That is, the carrier and / or bandwidth portion may be composed of CRB(s). An RB or CRB constituting the bandwidth portion may be referred to as a PRB, and within the bandwidth portion, a CRB index may be appropriately converted to a PRB index.

[0098] Downlink data may be transmitted via PDSCH. A base station may transmit configuration information of the PDSCH (e.g., scheduling information) to a terminal via PDCCH. A terminal may obtain the configuration information of the PDSCH by receiving the PDCCH (e.g., downlink control information (DCI)). For example, the configuration information of the PDSCH may include a modulation coding scheme (MCS) used for transmitting and receiving the PDSCH, time resource information of the PDSCH, frequency resource information of the PDSCH, feedback resource information for the PDSCH, etc. PDSCH may refer to a radio resource where downlink data is transmitted and received. Alternatively, PDSCH may refer to the downlink data itself. PDCCH may refer to a radio resource where downlink control information (e.g., DCI) is transmitted and received. Alternatively, PDCCH may refer to the downlink control information itself.

[0099] The terminal may perform a monitoring operation for the PDCCH to receive the PDSCH transmitted from the base station. The base station may notify the terminal of configuration information for the monitoring operation of the PDCCH using a higher-layer message (e.g., a radio resource control (RRC) message). The configuration information for the monitoring operation of the PDCCH may include CORESET (control resource set) information and search space information.

[0100] CORESET information may include PDCCH DMRS (demodulation reference signal) information, PDCCH precoding information, PDCCH occasion information, etc. The PDCCH DMRS may be a DMRS used to demodulate the PDCCH. A PDCCH occasion may be an area where the PDCCH can exist. That is, a PDCCH occasion may be an area where DCI can be transmitted. A PDCCH occasion may be referred to as a PDCCH candidate. PDCCH occasion information may include time resource information and frequency resource information of the PDCCH occasion. In the time domain, the length of the PDCCH occasion may be indicated in symbol units. In the frequency domain, the size of the PDCCH occasion may be indicated in RB units (e.g., PRB (physical resource block) units or CRB (common resource block) units).

[0101] The search space information may include a CORESET ID (identifier) ​​associated with the search space, the period of PDCCH monitoring, and / or an offset. The period and offset of PDCCH monitoring may each be specified in slot units. Additionally, the search space information may further include the index of the symbol where the PDCCH monitoring operation begins.

[0102] A base station may configure a Bandwidth Part (BWP) for downlink communication. BWPs may be configured differently for each terminal. The base station may notify the terminal of the BWP configuration information using upper-layer signaling. Upper-layer signaling may refer to "transmission operations of system information" and / or "transmission operations of Radio Resource Control (RRC) messages." One or more BWPs may be configured for a single terminal. The terminal may receive BWP configuration information from the base station and identify the BWP(s) configured by the base station based on the BWP configuration information. If multiple BWPs are configured for downlink communication, the base station may activate one or more of the multiple BWPs. The base station may transmit the configuration information of the activated BWP(s) to the terminal using at least one of upper-layer signaling, a Medium Access Control (MAC) Control Element (CE), or a DCI. The base station may perform downlink communication using the activated BWP(s). The terminal can identify the activated BWP(s) by receiving configuration information of the activated BWP(s) from the base station, and can perform a downlink reception operation on the activated BWP(s).

[0103] Meanwhile, communication systems (e.g., NR communication systems, 5G communication systems, 6G communication systems) can support usage scenarios such as eMBB (enhanced Mobile BroadBand), URLLC (Ultra Reliable Low Latency Communication), and mMTC (massive Machine Type Communication). Communication systems (e.g., communication networks) can support SBFD (subband full duplex) operation.

[0104] A communication system may support the time division duplexing (TDD) method. In a communication system that supports the TDD method (hereinafter referred to as the "TDD communication system"), DL (downlink) symbol(s) and UL (uplink) symbol(s) may be set in different time resources within a single carrier. DL symbols and UL symbols may be associated with coverage and / or latency. In a TDD communication system, the base station can utilize resources more efficiently than the frequency division duplexing (FDD) method by considering various use cases. Resource scheduling operations of the base station in a TDD communication system may be important. For enhanced TDD operation, SBFD operations (e.g., SBFD method) may be supported. If SBFD operations are supported in a TDD communication system, DL communication (e.g., transmission and reception of DL signals) and UL communication (e.g., transmission and reception of UL signals) may be performed simultaneously within the same time resource. For example, within the same time resource, some subbands may be DL subbands, and other subbands may be UL subbands and / or FL subbands. In this disclosure, the DL signal may be interpreted as a DL signal, a DL channel, or "DL signal and DL channel" depending on the context. In this disclosure, the UL signal may be interpreted as a UL signal, a UL channel, or "UL signal and UL channel" depending on the context.

[0105] Symbols to which SBFD operations are applied may be referred to as SBFD symbols. Symbols to which SBFD operations are not applied may be referred to as N(non)-SBFD symbols. N-SBFD symbols may be DL symbols, UL symbols, or FL symbols. In an SBFD symbol, the terminal can perform DL communication and UL communication. In other words, in an SBFD symbol, the terminal can perform full-duplex operation. The base station may assume that DL communication and UL communication are possible in an SBFD symbol. In an N-SBFD symbol, the terminal can perform one of DL communication and UL communication. In other words, in an N-SBFD symbol, the terminal can perform half-duplex operation. An SBFD symbol may be a symbol that includes a subband to which SBFD operations are performed. The subband for SBFD may be referred to or interpreted as a UL subband. The UL subband can exist (e.g., be configured) within the symbol where the SSB (synchronization signal block) is transmitted.

[0106] Resources for SBFD operation (e.g., time resources and / or frequency resources) may be configured in a semi-static manner. In other words, the configuration for SBFD resources may be a semi-static configuration. "That the SBFD resource configuration is a semi-static configuration" may mean that the SBFD resource is configured by semi-static signaling (e.g., system information, RRC messages). In this disclosure, SBFD resources may refer to time resources and / or frequency resources for SBFD operation. UL subbands for SBFD may be SBFD resources. Alternatively, SBFD resources may be configured in a dynamic manner. "That the SBFD resource configuration is a dynamic configuration" may mean that the SBFD resource is configured by dynamic signaling (e.g., MAC CE, DCI, SCI).

[0107] SBFD resources (e.g., UL subband, SBFD symbol) may be configured within DL resources and / or FL (flexible) resources configured by TDD-UL-DL configuration common information (e.g., TDD-UL-DL-configCommon). In the time domain, the transition point from an N-SBFD symbol to an SBFD symbol may be limited to one. In the time domain, the transition point from an SBFD symbol to an N-SBFD symbol may be limited to one. Regarding the resource configuration of a subband for SBFD, it may be desirable for the terminal to be aware of the resource configuration information of the subband for SBFD in advance.

[0108] TDD-UL-DL configuration common information can be used to configure patterns (e.g., TDD-UL-DL-Pattern) for DL ​​resources and / or UL resources in the time domain of a TDD communication system. Patterns for DL ​​resources and / or UL resources may be referred to as UL / DL patterns. UL / DL patterns may change depending on the environment of the communication system (e.g., TDD communication system). Up to two UL / DL patterns may be configured on a terminal. TDD-UL-DL configuration common information may be cell-specific parameters (e.g., cell-specific configuration information). The base station may change the configuration for symbol(s) (e.g., transmission direction, type) on a terminal-by-terminal basis based on a specific slot within a preset UL / DL pattern. The slot where the symbol configuration (e.g., symbol direction, symbol type) can be changed may be a slot configured as an FL resource by the TDD-UL-DL configuration common information. The symbol direction (e.g., symbol transmission direction) and / or symbol type may be DL, UL, or FL. The RRC signaling used to change the configuration of an FL slot (e.g., FL resource) may be TDD-UL-DL configuration-dedicated information (e.g., TDD-UL-DL-ConfigDedicated). Table 2 may be TDD-UL-DL configuration common information, and Tables 3 and 4 may be TDD-UL-DL configuration-dedicated information.

[0109]

[0110]

[0111]

[0112] The UL / DL pattern, configured by the common information of the TDD-UL-DL configuration, may be repeated according to a specific period (e.g., dl-UL-TransmissionPeriodicity). In the time interval where the UL / DL pattern is applied, the leading portion may be configured as a DL resource. In the time interval where the UL / DL pattern is applied, the trailing portion may be configured as a UL resource. Resources that are not configured as DL or UL resources in the time interval where the UL / DL pattern is applied may be FL resources. The period of the UL / DL pattern may vary depending on the reference numerology. A guard time (e.g., a guard gap) may be required for switching (e.g., transition) from a DL resource (e.g., DL symbol / slot) to a UL resource (e.g., UL symbol / slot). Since the propagation delay of the DL signal causes interference to the UL resource, a guard time may be required for switching from a DL resource to a UL resource. A separate guard time may not be required for switching from UL resources to DL resources. Since UL signals are transmitted based on TAC (timing advance command) directed by the base station, a guard time may not be required for switching from UL resources to DL resources.

[0113] TDD-UL-DL configuration common information (e.g., TDD-UL-DL-ConfigCommon) may be referred to as "TDD Common" or "TDD Common Information". TDD-UL-DL configuration dedicated information (e.g., TDD-UL-DL-ConfigDedicated) may be referred to as "TDD Dedicated" or "TDD Dedicated Information". UL subband may refer to a subband for SBFD. DL symbol(s) and / or DL ​​slot(s) may be referred to as DL area(or DL ​​resource). UL symbol(s) and / or UL slot(s) may be referred to as UL area(or UL resource). FL symbol(s) and / or FL slot(s) may be referred to as FL area(or FL resource). A terminal that supports (e.g. recognizes) SBFD operation may be referred to as an SBFD terminal or SBFD UE. A terminal that does not support (e.g., does not recognize) SBFD operation may be referred to as an N(non)-SBFD terminal or an N-SBFD UE. An N-SBFD terminal may be a legacy terminal (e.g., a legacy UE). In this disclosure, a terminal may be interpreted as an SBFD terminal and / or an N-SBFD terminal depending on the context. Legacy settings (e.g., legacy information, legacy settings information) may be information for an N-SBFD terminal.

[0114] An SBFD resource may be located adjacent to (e.g., contiguously) an N-SBFD resource. An SBFD resource may refer to an SBFD symbol and / or an SBFD slot. An N-SBFD resource may refer to an N-SBFD symbol and / or an N-SBFD slot. SBFD symbols and N-SBFD symbols may be located contiguously or discontinuously within a single slot. In slots (e.g., adjacent slots, contiguous slots), SBFD symbols and N-SBFD symbols may exist adjacently. The types of adjacent symbols (e.g., SBFD symbols or N-SBFD symbols) may be the same or different. The operation of the terminal may vary based on the types of adjacent symbols (e.g., the same symbol type or different symbol types).

[0115] A communication system supporting SBFD may support two SBFD configurations (e.g., SBFD configuration 1, SBFD configuration 2). SBFD configuration 1 may be referred to as configuration 1, SBFD transmission configuration 1, or SBFD configuration 1 transmission. SBFD configuration 2 may be referred to as configuration 2, SBFD transmission configuration 2, or SBFD configuration 2 transmission. If SBFD configuration 1 is configured on a terminal (e.g., indicated), the terminal may perform communication (e.g., downlink communication and / or uplink communication) using the same symbol type (e.g., SBFD symbol or N-SBFD symbol). If SBFD configuration 2 is configured on a terminal (e.g., indicated), the terminal may perform communication (e.g., downlink communication and / or uplink communication) using different symbol types (e.g., SBFD symbol and N-SBFD symbol). An SBFD terminal may operate based on one of SBFD settings, either SBFD setting 1 or SBFD setting 2. Among SBFD setting 1 and SBFD setting 2, SBFD setting 1 may be the default setting. For example, if there is no separate instruction regarding SBFD settings, the SBFD terminal may operate based on SBFD setting 1. If the base station instructs the terminal to SBFD setting 2 (for example, if SBFD setting 2 is enabled), the SBFD terminal may operate based on SBFD setting 2. Symbol types may be classified into SBFD symbols and N-SBFD symbols. Depending on the context, a symbol type may be interpreted as a symbol having the said symbol type (e.g., a resource).

[0116] Meanwhile, in a communication system supporting SBFD, RACH (random access channel) setting 1 (e.g., Option 1) and RACH setting 2 (e.g., Option 2) may be supported. In a scenario where RACH setting 1 is applied, an RA procedure (e.g., PRACH transmission) in an SBFD resource may be performed based on a legacy RACH setting (e.g., legacy RACH setting information). A legacy RACH setting may refer to a RACH setting used for an RA procedure in an N-SBFD resource. In a scenario where RACH setting 2 is applied, additional RACH settings (e.g., additional RACH setting information) may be additionally set in addition to the legacy RACH setting, and an RA procedure in an N-SBFD resource may be performed based on the legacy RACH setting, while an RA procedure in an SBFD resource may be performed based on the additional RACH setting. Additional RACH setting information may be referred to as SBFD RACH setting information.

[0117] An additional RO (RACH occasion) may be configured differently depending on RACH settings 1 and 2. In scenarios where RACH setting 1 applies, an additional RO may refer to an RO configured only on SBFD symbols and an RO configured across SBFD symbols and N-SBFD symbols. In scenarios where RACH setting 2 applies, an additional RO may refer to an RO configured based on SBFD RACH settings. A legacy RO may refer to an RO configured based on legacy RACH settings. A legacy RO may be configured (e.g., located) on N-SBFD symbols. A legacy RO may be referred to as a first PRACH occupation and may be used for legacy terminals that do not support SBFD. An additional RO may be configured (e.g., located) on at least one of N-SBFD symbols or SBFD symbols. An additional RO may be referred to as a second PRACH occupation and may be used for SBFD terminals that support SBFD.

[0118] Based on the SBFD RACH configuration, there may be ROs configured in the N-SBFD resource. The SBFD terminal may determine (e.g., decide) that the RO configured in the N-SBFD resource is an invalid RO according to the SBFD RACH configuration, and may not perform a msg1 transmission or a msgA transmission on the invalid RO. In other words, the SBFD terminal may expect a msg1 transmission on the RO configured by the legacy RACH configuration within the N-SBFD resource, and may expect a msg1 transmission on the RO configured by the SBFD RACH configuration within the SBFD resource. In this disclosure, a msg1 transmission may be interpreted to include not only a msg1 transmission but also a msgA transmission. Transmit power parameters for the legacy RACH configuration and the SBFD RACH configuration, respectively, may be configured independently. In the present disclosure, embodiments regarding the transmit power setting for msg1 and the transmit power setting for msg3 in the legacy RO and additional RO will be described.

[0119] [RO Type Settings and Transmit Power Settings for msg1 / msgA]

[0120] · Proposal #1

[0121] In scenarios where SBFD configuration 1 applies, the transmit power for the legacy RO and the additional RO, respectively, can be configured independently. In other words, the base station can generate transmit power configuration information for the legacy RO and the additional RO, respectively, and transmit this transmit power configuration information to the terminal via signaling. The terminal can receive the transmit power configuration information for the legacy RO and the additional RO, respectively, via the base station's signaling. The transmit power configuration information for the legacy RO may be referred to as legacy power configuration information. For convenience, the legacy power configuration information may also be referred to as legacy power configuration. The transmit power configuration information for the additional RO may be referred to as additional power configuration information (e.g., SBFD power configuration information). For convenience, the additional power configuration information may also be referred to as additional power configuration. The legacy power configuration information and the additional power configuration information may be included in the RACH configuration information. In scenarios where RACH configuration 1 applies, the legacy power configuration information and the additional power configuration information may be included in the legacy RACH configuration information. In a scenario where RACH setting 2 is applied, legacy power setting information may be included in legacy RACH setting information, and additional power setting information may be included in additional RACH setting information.

[0122] The SBFD terminal may refer to legacy power setting information to determine the transmit power of the RA preamble in the legacy RO. The SBFD terminal may refer to additional power setting information to determine the transmit power of the RA preamble in the additional RO. If the base station does not set additional RO setting information to the SBFD terminal, the SBFD terminal may determine the transmit power of the RA preamble in the additional RO based on the legacy power setting information. In other words, the legacy power setting information may be used instead of the additional power setting information to determine the transmit power of the RA preamble in the additional RO based on the fact that the additional power setting information is not specified.

[0123] Each of the legacy power setting information and the additional power setting information may include at least one of preambleReceivedTargetPower, power Ramping Step, priority-related parameter(s) of the power Ramping Step, maximum transmit power of the preamble, or maximum transmits of the preamble (preambleTransMax). The priority-related parameter(s) of the power Ramping Step may mean some or all of the priority-related parameters. The legacy power setting information may be used to determine the msg1 transmit power (e.g., msgA transmit power) at an RO (e.g., legacy RO) located (e.g., configured) in an N-SBFD symbol. The additional power setting information may be used to determine the msg1 transmit power (e.g., msgA transmit power) at an additional RO. The preamble may mean PRACH, RA preamble, etc. In this disclosure, the RA preamble may be interpreted as msg1 or msgA depending on the context.

[0124] If additional power setting information is not specified, the SBFD terminal may determine the transmit power of the RA preamble in the additional RO based on legacy power setting information and transmit the RA preamble using the determined transmit power. Alternatively, the operation of the terminal may vary depending on the RACH setting. In a scenario where RACH setting 1 applies, the RACH setting information may be set regardless of the terminal type (e.g., N-SBFD terminal, SBFD terminal). In other words, the RACH setting information may be set commonly for both N-SBFD terminals and SBFD terminals. If additional power setting information does not exist within the RACH setting information, the SBFD terminal may determine the transmit power of the RA preamble based on the legacy power setting information included in the RACH setting information. In a scenario where RACH setting 2 applies, the RACH setting information may be set per RO type. If additional power setting information does not exist (e.g., if additional power setting information is not set), the SBFD terminal may not expect to transmit an RA preamble from the RO located at the SBFD symbol (e.g., additional RO).

[0125] SBFD subbands (e.g., UL subbands, SBFD resources) may be located between N-SBFD symbols. Depending on the configuration of the SBFD subband, the number of ROs (e.g., additional ROs) located in the SBFD symbol may vary. Therefore, it may be necessary to set the maximum number of RA preamble transmissions independently for each RO type, as well as the transmit power settings. In other words, in scenarios where RACH setting 1 applies and / or RACH setting 2 applies, the maximum number of RA preamble transmissions may be set differently for each RO type. The window size for receiving msg2 / msgA may be set independently for each RO type. In other words, in scenarios where RACH setting 1 applies and / or RACH setting 2 applies, the window size for receiving msg2 / msgA may be set differently for each RO type.

[0126] · Proposal #1-1

[0127] In scenarios where RACH setting 1 and RACH setting 2 are applied, the SBFD terminal may transmit RA preambles on both legacy ROs and additional ROs. In this case, it may be necessary to define the RO type (e.g., legacy RO or additional RO) to which the RA preamble (e.g., initial RA preamble, first RA preamble) will be transmitted. SSB to RO mapping rules may be defined for each of the additional RO and legacy RO. For gain in terms of latency, during the initial attach procedure, the terminal may expect to transmit msg1 on the RO type closest to the point in time when it decides to perform the RA procedure (e.g., the earliest RO type). Considering the overhead of msg1 retransmission, the terminal may expect to transmit msg1 on the RO type associated with a DL signal (e.g., SSB, DL RS) that satisfies a specific condition (e.g., RSRP threshold).

[0128] Transmission of msg1 from an SBFD symbol (e.g., an additional RO) may act as interference to a terminal expecting DL reception from a resource adjacent to said SBFD symbol. An additional RSRP threshold for msg1 transmission from an additional RO may be set on the terminal. In other words, the legacy RSRP threshold for msg1 transmission from a legacy RO (rsrp-ThresholdSSB, rsrp-ThresholdSSB-SUL) and the additional RSRP threshold for msg1 transmission from an additional RO (rsrp-ThresholdSSB-SBFD, rsrp-ThresholdSSB-SUL-SBFD) may be set independently. The legacy RSRP threshold and the additional RSRP threshold may be included in the RACH configuration information. If the base station sets the additional RSRP threshold on the SBFD terminal, the SBFD terminal may select an RO type based on the additional RSRP threshold and expect to transmit msg1 from the selected RO type.

[0129] For example, if the RSRP of an SSB (or DL ​​RS) is greater than or equal to a legacy RSRP threshold and less than an additional RSRP threshold, the SBFD terminal may select a legacy RO associated with said SSB and transmit msg1 from the legacy RO. If the RSRP of an SSB (or DL ​​RS) is greater than or equal to an additional RSRP threshold (for example, if the RSRP of the SSB satisfies both the legacy RSRP threshold and the additional RSRP threshold), the SBFD terminal may select an additional RO associated with said SSB and transmit msg1 from the additional RO. If an additional RSRP threshold is not indicated to the SBFD terminal, the SBFD terminal may expect to transmit msg1 from the RO type closest to the point in time when it decided to perform the RA procedure (e.g., the earliest RO type).

[0130] Transmission of msg1 in a specific RO type may be defined as a default operation, and the specific RO type for the default operation may be defined as the default RO type. If the default RO type does not exist within a window (e.g., a window set by a base station), the terminal may be expected to transmit an RA preamble in an RO type different from the default type. For example, if the default type is a legacy RO and no legacy RO exists within the window, the terminal may be allowed to transmit an RA preamble in an additional RO. As another example, if the default type is an additional RO and no additional RO exists within the window, the terminal may be allowed to transmit an RA preamble in the default RO.

[0131] To maximize the benefits of SBFD operations, additional ROs may be configured as default RO types. In other words, additional ROs may be configured as default RO types to prioritize the transmission of RA preambles from SBFD symbols (e.g., additional ROs). If an additional RO exists within a preset window from the time it is decided to perform an RA procedure, the terminal may transmit an RA preamble from the additional RO. If an additional RO does not exist within a preset window from the time it is decided to perform an RA procedure, the terminal may transmit an RA preamble from a legacy RO. The performance of the above-described operations may be expected or permitted by the terminal. In this disclosure, "any operation permitted" may mean "that the base station has permitted the terminal to perform any operation."

[0132] Considering equity between legacy terminals and SBFD terminals, legacy ROs may be set as default RO types. If a legacy RO exists within a preset window from the time it is decided to perform the RA procedure, the terminal may transmit an RA preamble from the legacy RO. If a legacy RO does not exist within a preset window from the time it is decided to perform the RA procedure, the terminal may transmit an RA preamble from an additional RO. The performance of the above-described operation may be expected or permitted by the terminal.

[0133] A base station may generate RACH configuration information including information indicating the RO type for which RA preamble transmission is performed, and may transmit the RACH configuration information to a terminal via signaling. The terminal may receive the RACH configuration information via the base station's signaling and may identify the RO type for which RA preamble transmission is performed based on the information included in the RACH configuration information. The terminal may transmit an RA preamble at the RO type indicated by the base station.

[0134] Alternatively, RO type information (e.g., information indicating the RO type) may indicate the use of an additional RO (e.g., a second PRACH occupancy). The additional RO may be a second PRACH occupancy for CFRA (Contention-Free Random Access) or fallback CBRA (Contention-Based Random Access). If RO type information is indicated to the SBFD terminal, the SBFD terminal may transmit an RA preamble from the additional RO. If RO type information is not indicated to the SBFD terminal, the SBFD terminal may transmit an RA preamble from a legacy RO (e.g., a first PRACH occupancy).

[0135] In a scenario where RACH setting 1 is applied and additional power setting information is not instructed to the terminal, the terminal may transmit an RA preamble from the legacy RO. The performance of the above-described operation may be expected or permitted at the terminal.

[0136] · Proposal #1-2

[0137] Considering the signaling overhead of additional power setting information, the base station may transmit some or all of the parameters included in the additional power setting information to the terminal in the form of an offset. The offset for the parameters included in the additional power setting information may be set based on the parameters included in the legacy power setting information. The parameters included in the additional power setting information may be mapped one-to-one with the parameters included in the legacy power setting information.

[0138] The terminal may determine the transmit power of the RA preamble at the additional RO based on an implicit method. For example, if the preamble reception target power (P) included in the legacy power setting information is within a specific range (e.g., -a dBm ≤ P < -b dBm), the terminal may determine the transmit power of the RA preamble at the additional RO to be P+X dBm or PX dBm, and transmit the RA preamble at the additional RO using the determined transmit power. Alternatively, the terminal may transmit the RA preamble at the additional RO using a transmit power X dBm lower than the preamble reception target power (P) set for the legacy RO.

[0139] Figure 9 is a flowchart illustrating the RA procedure.

[0140] Referring to FIG. 9, a base station may generate RACH configuration information and transmit the RACH configuration information to a terminal (e.g., an SBFD terminal) via signaling (S900). The terminal may receive the RACH configuration information via the base station's signaling (S900). In the present disclosure, the signaling may be at least one of SI (system information) signaling (e.g., MIB, SIB), RRC signaling (e.g., RRC message), MAC signaling (e.g., MAC CE), or PHY signaling (e.g., DCI). The base station may set one or more parameters defined in Table 5 below and transmit one or more parameters to the terminal via signaling (S910). The terminal may receive one or more parameters defined in Table 5 via the base station's signaling (S910). One or more parameters defined in Table 5 may be parameters used for the RA procedure when SBFD is configured. In other words, one or more parameters defined in Table 5 may be SBFD RA parameters (e.g., SBFD RA setting information).

[0141]

[0142] One or more parameters defined in Table 5 may be included in BWP Uplink Common configuration information (BWP-UplinkCommon). BWP Uplink Common configuration information may be included in BWP Uplink configuration information (BWP-Uplink), and BWP Uplink configuration information may be included in ServingCellConfig. In S910, the base station may transmit an RRC message (e.g., RRC reconfiguration message, RRC resume message) containing ServingCellConfig information to the terminal, and the terminal may receive the RRC message from the base station and verify one or more parameters defined in Table 5.

[0143] The maximum number of transmissions of an RO type may indicate the maximum number of RA preamble transmissions before switching the RO type between a legacy RO (e.g., a first PRACH occupancy) and an additional RO (e.g., a second PRACH occupancy). In other words, the maximum number of transmissions of an RO type may indicate the maximum number of RA preamble transmissions in the same RO type. Even if the number of RA preamble transmissions (e.g., number of retransmissions, number of repeated transmissions) reaches the maximum number of retransmissions of an RO type, if the transmission of the RA preamble is unsuccessful, the terminal may retransmit the RA preamble after switching the RO type.

[0144] The SBFD RO type may indicate the RO type that the SBFD terminal uses for transmitting an initial RA preamble (e.g., the first RA preamble). Based on the SBFD RO type indicating a legacy RO, the SBFD terminal may perform an initial transmission (e.g., the first transmission) of the RA preamble from the legacy RO. If the transmission of the RA preamble from the legacy RO fails, the terminal may retransmit the RA preamble from the legacy RO until the maximum number of transmissions for the RO type is reached. Based on the SBFD RO type indicating an additional RO, the SBFD terminal may perform an initial transmission of the RA preamble from the additional RO. If the transmission of the RA preamble from the additional RO fails, the terminal may retransmit the RA preamble from the additional RO until the maximum number of transmissions for the RO type is reached.

[0145] If an SBFD RO type is indicated to the terminal, the terminal can determine the RO type in which the transmission of the RA preamble (e.g., initial transmission, first transmission) is performed based on the SBFD RO type. If an SBFD RO type is not indicated to the terminal, the terminal can determine the RO type in which the transmission of the RA preamble (e.g., initial transmission, first transmission) is performed based on the SBFD RSRP threshold of the RO type and the use of the SBFD RSRP threshold.

[0146] The SBFD RSRP threshold of the RO type may be an RSRP threshold for selecting the initial RO type among legacy RO and additional RO. The initial RO type may be the RO type where the initial transmission of the RA preamble is performed. The terminal may measure a DL signal (e.g., SSB, DL RS) and compare the measured RSRP of the DL signal with the SBFD RSRP threshold of the RO type. The DL RS may be a PL-RS (pathloss reference signal), CSI-RS, DM-RS, etc.

[0147] The usage of the RO type SBFD RSRP threshold can be set to above or below. If the usage of the RO type SBFD RSRP threshold is set to above, the terminal can select an additional RO as the initial RO type (e.g., determine) if the measured RSRP is higher than the RO type SBFD RSRP threshold. If the usage of the RO type SBFD RSRP threshold is set to above, the terminal can select a legacy RO as the initial RO type (e.g., determine) if the measured RSRP is lower than the RO type SBFD RSRP threshold. If the usage of the RO type SBFD RSRP threshold is set to below, the terminal can select an additional RO as the initial RO type (e.g., determine) if the measured RSRP is lower than the RO type SBFD RSRP threshold. If the usage of the RO type SBFD RSRP threshold is set to below, the terminal can select a legacy RO as the initial RO type (e.g., determine) if the measured RSRP is higher than the RO type SBFD RSRP threshold.

[0148] When the terminal intends to perform an RA procedure, it can determine the RO type in which the RA procedure is performed based on one or more parameters defined in Table 5 (S920). The initial RO type can be determined based on the following methods.

[0149] The terminal can check whether the SBFD RO type has been set by the base station. If the SBFD RO type has been set by the base station to the terminal (e.g., if the SBFD RA setting information includes the SBFD RO type), the terminal can determine the RO type in which the transmission of the RA preamble (e.g., the initial RA preamble) is performed based on the SBFD RO type. Based on the SBFD RO type indicating a legacy RO, the terminal can determine the legacy RO as the initial RO type and start the transmission of the RA preamble from the legacy RO. Based on the SBFD RO type indicating an additional RO, the terminal can determine the additional RO as the initial RO type and start the transmission of the RA preamble from the additional RO.

[0150] If the SBFD RO type is not set to the terminal by the base station (e.g., if the SBFD RA setting information does not include the SBFD RO type), the terminal can determine the RO type in which the transmission of the RA preamble (e.g., the initial RA preamble) is performed based on the SBFD RSRP threshold of the RO type and the use of the SBFD RSRP threshold. If the use of the SBFD RSRP threshold of the RO type is set to below, the terminal can determine an additional RO as the initial RO type if the measured RSRP of the DL signal (e.g., SSB, PT-RS, CSI-RS, DM-RS) is less than the SBFD RSRP threshold of the RO type. If the use of the SBFD RSRP threshold of the RO type is set to below, the terminal can determine a legacy RO as the initial RO type if the measured RSRP of the DL signal is not less than the SBFD RSRP threshold of the RO type.

[0151] When the SBFD RSRP threshold usage of the RO type is set to above, the terminal can determine an additional RO as the initial RO type if the measured RSRP of a DL signal (e.g., SSB, PT-RS, CSI-RS, DM-RS) is greater than the SBFD RSRP threshold of the RO type. When the SBFD RSRP threshold usage of the RO type is set to above, the terminal can determine a legacy RO as the initial RO type if the measured RSRP of a DL signal is not greater than the SBFD RSRP threshold of the RO type.

[0152] After determining the initial RO type, the terminal can transmit an RA preamble to the base station in the initial RO type (e.g., legacy RO or additional RO) (S930). If the transmission of the RA preamble fails, the terminal can retransmit the RA preamble to the base station in the initial RO type. The transmission of the RA preamble in the initial RO type (e.g., retransmission) can be performed until the number of transmissions of the RA preamble (e.g., number of retransmissions) reaches the maximum number of transmissions for the RO type. When the number of transmissions of the RA preamble (e.g., number of retransmissions) reaches the maximum number of transmissions for the RO type, the terminal can switch the RO type for transmitting the RA preamble (S940).

[0153] If, while the terminal is transmitting an RA preamble from an additional RO, the number of transmissions of the RA preamble reaches the maximum number of transmissions for the RO type, the terminal may switch the RO type for transmitting the RA preamble from the additional RO to the legacy RO. For example, if there exists a legacy RO that supports the same feature or feature combination associated with the additional RO, and there exists a legacy RO that supports a number of repetitions set to be greater than or equal to the number of repetitions of the RA preamble associated with the additional RO (e.g., msg1-RepetitionNum), the terminal may switch the RO type for transmitting the RA preamble from the additional RO to the legacy RO. In the present disclosure, "that a legacy RO exists" may mean "that a legacy RO is configured on the terminal," and "that an additional RO exists" may mean "that an additional RO is configured on the terminal."

[0154] If the number of transmissions of the RA preamble reaches the maximum number of transmissions for the RO type while the terminal is transmitting the RA preamble from the legacy RO, the terminal may switch the RO type for transmitting the RA preamble from the legacy RO to an additional RO. For example, if there is an additional RO that supports the same function or combination of functions associated with the legacy RO, and there is an additional RO that supports a number of repetitions set to be greater than or equal to the number of repetitions of the RA preamble associated with the legacy RO (e.g., msg1-RepetitionNum), the terminal may switch the RO type for transmitting the RA preamble from the legacy RO to the additional RO.

[0155] After switching the RO type for transmitting the RA preamble, the terminal can retransmit the RA preamble from the switched RO type (e.g., legacy RO or additional RO) (S950). If the transmission of the RA preamble is successful, the terminal can perform the remaining RA procedure with the base station (S960). For example, in the 4-step RA procedure, the transmission and reception procedure of msg2, msg3, and msg4 between the terminal and the base station can be performed. In the 2-step RA procedure, the transmission and reception procedure of msgB between the terminal and the base station can be performed.

[0156] [RO Type Setting and Transmit Power Setting in Retransmission of msg1 / msgA]

[0157] · Proposal #2

[0158] The SBFD terminal may transmit the RA preamble in one of two RO types during the initial transmission of the RA preamble (e.g., msg1, msgA). Depending on the channel environment between the base station and the terminal, the transmission of the RA preamble may fail. If the transmission of the RA preamble fails, retransmission of the RA preamble may be required. The RO type to which the RA preamble is retransmitted may be the same as or different from the RO type in which the previous transmission of the RA preamble (e.g., initial transmission) was performed. The transmit power for the retransmission of the RA preamble may be determined based on the RO type in which the retransmission is performed. Based on one of the following multiple proposals (e.g., methods for determining RO type and transmit power), the terminal may determine the RO type for the transmission of the RA preamble (e.g., initial transmission, retransmission) and determine the transmit power of the RA preamble based on the determined RO type. A plurality of proposals may be proposal #2-1, proposal #2-2, proposal #2-2-1, proposal #2-2-2, proposal #2-3, proposal #2-3-1, and / or proposal #2-3-2. Alternatively, a plurality of the following proposals (e.g., methods for determining RO type and transmit power) may be supported, and a base station may instruct a terminal to one of the plurality of proposals through signaling, and the terminal may determine an RO type for the transmission of an RA preamble (e.g., initial transmission, retransmission) based on one proposal indicated by the base station's signaling, and may determine the transmit power of the RA preamble based on the determined RO type.

[0159] · Proposal #2-1

[0160] The terminal may retransmit the RA preamble at the RO type used for the initial transmission (e.g., initial transmission) of the RA preamble. The performance of the above-described operation may be expected or permitted at the terminal. If there is no change in the RO type between the initial transmission and the retransmission of the RA preamble, the terminal may determine the transmission power for the retransmission of the RA preamble based on existing methods. Therefore, the overhead in the communication system may not be large. However, inefficiency issues in terms of delay may occur depending on the setting of the UL subband. The terminal may determine the transmission power of the RA preamble based on transmission power setting information for each RO type and transmit the RA preamble using the determined transmission power.

[0161] · Proposal #2-2

[0162] The base station may set specific conditions (e.g., maximum number of transmissions, window) to the SBFD terminal through signaling. The SBFD terminal may check the specific conditions through the base station's signaling. Within the specific conditions, the SBFD terminal may retransmit the RA preamble on the same RO type as where the initial transmission of the RA preamble was performed, and after the specific conditions, may retransmit the RA preamble on a different RO type than where the initial transmission of the RA preamble was performed. The performance of the above-described operations may be expected or permitted at the terminal.

[0163] A specific condition, the maximum number of transmissions, may be set for the same RO type. A specific condition, the window, may be set for the same RO type. If the specific condition is set to the maximum number of transmissions, the SBFD terminal may retransmit the RA preamble in the same RO type where the initial transmission of the RA preamble was performed until the number of RA preamble transmissions (e.g., number of retransmissions) reaches the maximum number of transmissions, and may retransmit the RA preamble in a different type (or the same RO type and / or a different RO type) than the RO type where the initial transmission of the RA preamble was performed after the number of RA preamble transmissions reaches the maximum number of transmissions. The performance of the above-described operations may be expected or permitted at the terminal. The maximum number of retransmissions for the selection of the RO type may be set at the terminal independently of the existing maximum number of RA preamble retransmissions (preambleTransMax). The maximum number of retransmissions for selecting the RO type can be defined by preambleTransMaxRO-Type. preambleTransMaxRO-Type can be set to a value smaller than preambleTransMax. preambleTransMaxRO-Type can be set independently of preambleTransMax, preambleTransMaxRO-Type can indicate the maximum number of RA preamble transmissions in the same RO type, and preambleTransMax can indicate the maximum number of RA preamble transmissions regardless of the RO type.

[0164] If a specific condition is set to a window, the start time of the window may be the first or last symbol of the RO where the initial transmission of the RA preamble is performed. The window size may be less than or equal to the RAR (random access response) (e.g., msg2 or msgB). In other words, the window size may be less than or equal to the window size for receiving the RAR. After the window is terminated, the SBFD terminal may transmit the RA preamble in an RO type different from the RO type where the initial transmission of the RA preamble was performed. In other words, when the window is terminated, the SBFD terminal may transmit the RA preamble regardless of the RO type. The performance of the above-described operation may be expected or permitted at the terminal.

[0165] When the RO type where the initial transmission of the RA preamble is performed is different from the RO where the retransmission of the RA preamble is performed, the transmission power for the retransmission of the RA preamble needs to be determined by taking into account collisions and interference between the SBFD terminal and the legacy terminal.

[0166] · Proposal #2-2-1

[0167] If the initial transmission and retransmission of an RA preamble are performed on different RO types, the SBFD terminal may determine the transmit power for the retransmission of the RA preamble by using the ramping counter used in the previously failed RA preamble transmission. In other words, the ramping counter may not be initialized even if the RO type to which the RA preamble is transmitted is switched. The SBFD terminal may use the ramping counter used to determine the transmit power of the RA preamble immediately before switching the RO type to determine the transmit power of the first RA preamble in the switched RO type. In other words, the ramping counter may be maintained. Alternatively, the SBFD terminal may add 1 to the ramping counter used to determine the transmit power of the RA preamble immediately before switching the RO type, and use "ramping counter + 1" to determine the transmit power of the first RA preamble in the switched RO type. In other words, as compensation for the transmission failure of the RA preamble, the value obtained by adding 1 to the ramping counter for determining the transmission power of the RA preamble immediately before switching the RO type can be used as a ramping counter for determining the transmission power of the first RA preamble in the switched RO type.

[0168] Since the transmit power setting information is set independently for each RO type, it may be necessary to discuss which power ramping step (e.g., the power ramping step for the RO type before switching or the power ramping step for the switched RO type) to use when switching the RO type. Even when the RO type to which the RA preamble is transmitted is switched during the RA preamble retransmission procedure, in order to reduce overhead and sudden changes in transmit power, the SBFD terminal may determine the transmit power of the RA preamble in the switched RO type based on the power ramping step for the RO type before switching, and may retransmit the RA preamble using the determined transmit power. The performance of the above-described operation may be expected or permitted at the terminal.

[0169] Alternatively, considering equity with terminals transmitting RA preambles in different RO types, the SBFD terminal may determine the transmit power of the RA preamble based on a power ramping step for the switched RO type when the RO type is switched, and may retransmit the RA preamble using the determined transmit power. The above-described operation may be expected or permitted at the terminal.

[0170] If the RO type is switched while transmitting the RA preamble, the terminal may or may not initialize the actual number of transmissions of the RA preamble (e.g., a counter).

[0171] · Proposal #2-2-2

[0172] If the RO type is switched while transmitting an RA preamble, the SBFD terminal may initialize the ramping counter to ensure fairness with other terminals transmitting an RA preamble from the switched RO, and may determine the transmit power of the RA preamble from the switched RO based on the initialized ramping counter. At this time, the actual number of transmissions of the RA preamble (e.g., counter) at the SBFD terminal may or may not be initialized. Due to the initialization of the ramping counter, the transmission of the RA preamble from the switched RO type may be interpreted as the transmission of a new RA preamble. A power ramping step associated with the switched RO type may be used to ensure fairness with other terminals. When the size of the power ramping step for the switched RO type is smaller than the size of the power ramping step for the RO type before switching, as compensation for the retransmission of the RA preamble, the SBFD terminal may use the power ramping step used to determine the transmission power of the RA preamble in the RO type before switching to determine the transmission power of the RA preamble in the switched RO type.

[0173] · Proposal #2-3

[0174] A terminal (e.g., an SBFD terminal) may retransmit the RA preamble at the nearest RO (e.g., the earliest RO) from the point in time when it is decided to retransmit the RA preamble regardless of the RO type. Based on Proposal #2-3, the terminal may connect to the base station faster than in Proposal #2-1 and / or Proposal #2-2. However, the complexity of the communication system in Proposal #2-3 may be greater than the complexity of the communication system in Proposal #2-1 and / or Proposal #2-2. Based on Proposal #2-3, since the RA preamble is transmitted (e.g., retransmitted) at different RO types, the transmission power setting may become complex in consideration of fairness with legacy terminals. The terminal may expect to transmit the RA preamble at the available RO regardless of the RO type. In this case, the transmission power of the RA preamble may be set based on Proposal #2-3-1 and / or Proposal #2-3-2 below.

[0175] · Proposal #2-3-1

[0176] The terminal can operate a single ramping counter regardless of the RO type. For fairness with other terminals transmitting an RA preamble in the same RO type as the RO type where the initial transmission of the RA preamble was performed, even when the RO type is switched, the terminal can determine the transmission power for the retransmission of the RA preamble in the switched RO type based on the power ramping step for the RO type where the initial transmission of the RA preamble was performed. In other words, even when the RO type is switched, the terminal can determine the transmission power of the RA preamble using the same power ramping step.

[0177] Power ramping steps may be set differently for each RO type, and the distribution of RO types in the resource grid may be uneven. Considering the above points, when an RO type is switched while transmitting an RA preamble, the terminal may maintain a ramping counter and determine the transmission power of the RA preamble using a power ramping step associated with the RO type to which the actual RA preamble is transmitted.

[0178] · Proposal #2-3-2

[0179] The SBFD terminal can independently determine the transmit power of the RA preamble for each different RO type. The SBFD terminal can independently perform counting based on a ramping counter per RO type. The SBFD terminal can use a power ramping step associated with the RO type. The maximum number of transmissions of msg1 may be applied per RO type. Alternatively, a single maximum number of transmissions for msg1 may be used regardless of the RO type. In this case, the SBFD terminal can count the number of transmissions of the RA preamble based on the single maximum number of transmissions regardless of the RO type, and can transmit the RA preamble until the single maximum number of transmissions is reached. The operation described above may be expected or permitted in the terminal.

[0180] When ramping counters are operated independently for each RO type and RA preambles are transmitted in {Legacy RO → Additional RO → Legacy RO → Legacy RO → Additional RO}, the ramping counter for the Legacy RO at the SBFD terminal may be {1 → 1 → 2 → 3 → 3}, and the ramping counter for the Additional RO at the SBFD terminal may be {0 → 1 → 1 → 1 → 2}. In this case, the counter for the actual transmission of the RA preamble may be {1 → 2 → 3 → 4 → 5}. In other words, the actual number of transmissions of the RA preamble can be determined regardless of the RO type. Alternatively, the counter for the actual transmission of the RA preamble can be determined per RO type, and the maximum number of transmissions of the RA preamble can be set per RO type. In this case, when the actual number of transmissions of the RA preamble in a specific RO type reaches the maximum number of transmissions, the SBFD terminal can be expected not to transmit the RA preamble in the specific RO type.

[0181] The method for determining the transmit power of the RA preamble described above may be applied to other proposals. The proposals described above may be applied equally to RACH settings 1 and 2. Alternatively, different proposals may be applied to RACH settings 1 and 2, respectively.

[0182] [Initial transmit power settings for msg3 / msgB]

[0183] · Proposal #3

[0184] The base station can control the transmit power of msg3 through msg2. Unlike legacy terminals, SBFD terminals can transmit RA preambles on different RO types. Therefore, a method for controlling transmit power for msg2 and / or msg3 may be required. The base station can generate msg2 (e.g., RAR) containing legacy TPC (transmission power control) commands for legacy ROs and additional TPC commands for additional ROs, and transmit msg2 to the terminal. In other words, msg2 (e.g., UL grant included in msg2) may contain two TPC commands.

[0185] Since the base station does not know the location of the terminal, it may transmit msg2 (e.g., RAR) to the terminal, which includes a TPC command determined by assuming the RA preamble was transmitted from a legacy RO and a TPC command determined by assuming the RA preamble was transmitted from an additional RO. The TPC command associated with the legacy RO may be referred to as the legacy TPC command. The TPC command associated with the additional RO may be referred to as the additional TPC command. For backward compatibility with legacy terminals, the additional TPC command may be represented by bits that are not previously used. The terminal may receive msg2 from the base station and verify the legacy TPC command and the additional TPC command included in msg2. The terminal may determine the transmit power of msg3 based on the TPC command associated with the RO type to which the RA preamble was transmitted among the legacy TPC command and the additional TPC command, and transmit msg3 to the base station using the determined transmit power.

[0186] Considering that an RA preamble is transmitted in different RO types as in Proposal #2-2 and / or Proposal #2-3, the terminal may determine the transmit power of msg3 based on a single power control adjustment parameter or multiple power control adjustment parameters. "Using a single power control adjustment parameter" may mean "the SBFD terminal uses a power control adjustment parameter regardless of the RO type." In this case, when retransmitting the RA preamble, the power used for the transmission of the previous RA preamble may be carried over as is. The SBFD terminal may determine the transmit power of msg3 based on the power used for the transmission of the RA preamble prior to the transmission of msg3, regardless of the RO type.

[0187] "The use of multiple power control parameters" may mean that "the SBFD terminal independently determines the transmit power for msg3 transmission in different RO types." The SBFD terminal may consider msg3 transmission (e.g., msg3 retransmission) in each of the different RO types as an independent procedure and may determine the total transmit power for msg3 transmission per RO type. The transmit power of msg3 may be determined based on the transmit power used in the most recent RA preamble transmission. Subsequently, for the retransmission of msg3, the SBFD terminal may accumulate power per RO type and determine the transmit power for msg3 retransmission based on the accumulated power per RO type. A terminal in the RRC idle state may utilize two power control states introduced for the unified TCI (transmission configuration indicator) state.

[0188] The proposals of the present disclosure may be applied to various scenarios and types. In other words, the proposals of the present disclosure may not be interpreted as being limited to specific scenarios and types. Depending on the conditions, one proposal or a combination of multiple proposals may be applied.

[0189] In the present disclosure, the UL subband may be a time domain and frequency domain where uplink communication is possible in DL symbol(s) and / or FL symbol(s). The UL available PRBs may be an overlapping area between the UL subband and an active UL BWP. In the present disclosure, the DL subband may be a time domain and frequency domain where downlink communication is possible in DL symbol(s) and / or FL symbol(s). The DL available PRBs may be an overlapping area between the DL subband and a BWP (e.g., an active DL BWP).

[0190] In the present disclosure, a terminal may transmit information to a base station indicating whether it supports the function(s) proposed in the present disclosure. Information indicating whether it supports the function(s) may be included in a UE capability report. A base station may receive a UE capability report from a terminal and perform signaling and / or operations based on the information included in the UE capability information (e.g., information indicating whether it supports the function(s).

[0191] Settings for the UL subband (e.g., SBFD settings) can be transmitted via signaling (e.g., RRC signaling). SBFD settings can be transmitted after the transmission of TDD common settings. The methods proposed in this disclosure can be applied to unlicensed bands as well as licensed bands. The methods proposed in this disclosure can be applied to sidelinks and / or supplementary uplinks (SUL). For example, the methods proposed in this disclosure can be applied to determine transmit power in sidelinks and / or SULs.

[0192] Each of the proposals of the present disclosure may be applied independently. Or a combination of the proposals of the present disclosure may be applied. Some proposals of the present disclosure may be applied to other proposals. Each of the options of the present disclosure may be applied independently. Or a combination of the options of the present disclosure may be applied. Some options of the present disclosure may be applied to other options. The proposals and / or options of the present disclosure may be applied regardless of the RRC state of the terminal. For example, a terminal in an RRC idle state, a terminal in an RRC inactive state, and / or a terminal in an RRC connected state may perform the proposals and / or options of the present disclosure. A base station may perform the proposals and / or options of the present disclosure for a terminal in an RRC idle state, a terminal in an RRC inactive state, and / or a terminal in an RRC connected state.

[0193] The channels / signals to which the proposals of the present disclosure apply may not be limited to specific channels / signals. In other words, the proposals of the present disclosure may be applied identically or similarly to all channels / signals (e.g., all uplink channels, all uplink signals, all downlink channels, all downlink signals). The proposals of the present disclosure may be extended to various RA procedures (e.g., 2-step RA procedures, RA procedures proposed in 6G communication systems) as well as 4-step RA procedures. The names of messages in RA procedures may be described differently.

[0194] The operation of the method according to the present disclosure can be implemented as a computer-readable program or code on a computer-readable recording medium. A computer-readable recording medium includes any type of recording device in which information that can be read by a computer system is stored. Additionally, a computer-readable recording medium may be distributed across networked computer systems, allowing the computer-readable program or code to be stored and executed in a distributed manner.

[0195] In addition, computer-readable recording media may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Program instructions may include machine code, such as that generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc.

[0196] Some aspects of the present disclosure have been described in the context of a device, but may also be described according to a corresponding method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method may also be described according to a corresponding block or item or a feature of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, at least one of the most important method steps may be performed by such a device.

[0197] A programmable logic device (e.g., a field-programmable gate array) may be used to perform some or all of the functions of the methods described in this disclosure. A field-programmable gate array may operate with a microprocessor to perform one of the methods described in this disclosure. Generally, it is preferable that the methods be performed by some hardware device.

[0198] Although the present disclosure has been described with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the present disclosure without departing from the spirit and scope of the present disclosure as set forth in the following claims.

Claims

1. As a method of UE (user equipment), A step of receiving SBFD (subband full duplex) RA (random access) configuration information from a base station; A step of determining the initial RO (RACH (random access channel) occasion) type as a legacy RO or an additional RO based on information included in the above SBFD RA setting information; and The method includes the step of transmitting an RA preamble to the base station from the legacy RO or the additional RO determined as the initial RO type, and The legacy RO is set in an N(non)-SBFD resource, and the additional RO is set in an SBFD resource or at least one of the N-SBFD resources, UE's method.

2. In Claim 1, The above SBFD RA setting information comprises at least one of an SBFD RO type indicating the initial RO type, an SBFD RSRP (reference signal received power) threshold for determining the initial RO type, an SBFD RSRP threshold for determining the initial RO type, or the maximum number of transmissions of the RA preamble in the same RO type. UE's method.

3. In Claim 1, The step of determining the above initial RO type as a legacy RO or an additional RO is, The method comprises the step of determining the initial RO type as the legacy RO based on the fact that the SBFD RA setting information includes an SBFD RO type indicating the initial RO type, and that the SBFD RO type indicates the legacy RO. UE's method.

4. In Claim 1, The step of determining the above initial RO type as a legacy RO or an additional RO is, The above SBFD RA setting information includes an SBFD RO type indicating the above initial RO type, and based on the fact that the SBFD RO type indicates the above additional RO, the step of determining the above initial RO type as the above additional RO, UE's method.

5. In Claim 1, The step of determining the above initial RO type as a legacy RO or an additional RO is, Based on the fact that the above SBFD RA setting information does not include an SBFD RO type indicating the above initial RO type, and the above SBFD RA setting information includes an SBFD RSRP threshold and an SBFD RSRP threshold usage for determining the above initial RO type, and the above SBFD RSRP threshold usage is set to below, A step of determining the initial RO type as the additional RO based on the fact that the RSRP measured in the above UE is smaller than the SBFD RSRP threshold; and A step comprising determining the initial RO type as the legacy RO based on the fact that the RSRP measured in the above UE is not less than the SBFD RSRP threshold, UE's method.

6. In Claim 5, The above-mentioned measured RSRP is the measurement result of the PL-RS (pathloss reference signal) received from the base station, UE's method.

7. In Claim 1, The step of determining the above initial RO type as a legacy RO or an additional RO is, Based on the fact that the above SBFD RA setting information does not include an SBFD RO type indicating the above initial RO type, and the above SBFD RA setting information includes an SBFD RSRP threshold and an SBFD RSRP threshold usage for determining the above initial RO type, and the above SBFD RSRP threshold usage is set to above, A step of determining the initial RO type as the additional RO based on the fact that the RSRP measured in the above UE is greater than the SBFD RSRP threshold; and A step comprising determining the initial RO type as the legacy RO based on the fact that the RSRP measured in the above UE is not greater than the SBFD RSRP threshold, UE's method.

8. In Claim 1, If the transmission of the above RA preamble fails, the step of retransmitting the above RA preamble to the base station; A step of switching the initial RO type to another RO type based on the fact that the number of transmissions of the RA preamble has reached the maximum number of transmissions indicated by the information included in the SBFD RA setting information; and The method further includes the step of retransmitting the RA preamble to the base station in the above-mentioned other RO type, and The above maximum number of transmissions indicates the maximum number of transmissions of the above RA preamble in the same RO type, UE's method.

9. In Claim 8, The step of switching the above initial RO type to another RO type is, Based on the fact that the initial RO type is the legacy RO, there exists an additional RO that supports the same function or combination of functions associated with the legacy RO, and there exists an additional RO that supports a number of repetitions set greater than or equal to the number of repetitions of the RA preamble associated with the legacy RO, the method comprises the step of switching the RO type for RA preamble transmission from the legacy RO to the additional RO. UE's method.

10. In claim 8, The step of switching the initial RO type above is, Based on the fact that the initial RO type is the additional RO, there exists a legacy RO that supports the same function or combination of functions associated with the additional RO, and there exists a legacy RO that supports a number of repetitions set greater than or equal to the number of repetitions of the RA preamble associated with the additional RO, the method comprises the step of switching the RO type for RA preamble transmission from the additional RO to the legacy RO. UE's method.

11. As UE (user equipment), It includes at least one processor, The above at least one processor is the UE, Receive SBFD (subband full duplex) RA (random access) configuration information from the base station; Based on the information included in the above SBFD RA configuration information, the initial RO (RACH (random access channel) occasion) type is determined as a legacy RO or an additional RO; and Causing the transmission of an RA preamble to the base station from the legacy RO or the additional RO determined as the initial RO type, and The legacy RO is set in an N(non)-SBFD resource, and the additional RO is set in an SBFD resource or at least one of the N-SBFD resources, UE.

12. In Claim 11, The above SBFD RA setting information comprises at least one of an SBFD RO type indicating the initial RO type, an SBFD RSRP (reference signal received power) threshold for determining the initial RO type, an SBFD RSRP threshold for determining the initial RO type, or the maximum number of transmissions of the RA preamble in the same RO type. UE.

13. In Claim 11, In the procedure for determining the above initial RO type as a legacy RO or an additional RO, the above at least one processor is that the UE, The above SBFD RA configuration information includes an SBFD RO type indicating the above initial RO type, and based on the fact that the above SBFD RO type indicates the above legacy RO, causes the above initial RO type to be determined as the above legacy RO, UE.

14. In Claim 11, In the procedure for determining the above initial RO type as a legacy RO or an additional RO, the above at least one processor is that the UE, The above SBFD RA setting information includes an SBFD RO type indicating the above initial RO type, and based on the fact that the above SBFD RO type indicates the above additional RO, causes the above initial RO type to be determined as the above additional RO, UE.

15. In Claim 11, In the procedure for determining the above initial RO type as a legacy RO or an additional RO, the above at least one processor is that the UE, Based on the fact that the above SBFD RA setting information does not include an SBFD RO type indicating the above initial RO type, and the above SBFD RA setting information includes an SBFD RSRP threshold and an SBFD RSRP threshold usage for determining the above initial RO type, and the above SBFD RSRP threshold usage is set to below, Based on the fact that the RSRP measured in the above UE is smaller than the SBFD RSRP threshold, the above initial RO type is determined as the above additional RO; and Causing the initial RO type to be determined as the legacy RO based on the fact that the RSRP measured in the above UE is not less than the SBFD RSRP threshold, UE.

16. In Claim 15, The above-mentioned measured RSRP is the measurement result of the PL-RS (pathloss reference signal) received from the base station, UE.

17. In Claim 11, In the procedure for determining the above initial RO type as a legacy RO or an additional RO, the above at least one processor is that the UE, Based on the fact that the above SBFD RA setting information does not include an SBFD RO type indicating the above initial RO type, and the above SBFD RA setting information includes an SBFD RSRP threshold and an SBFD RSRP threshold usage for determining the above initial RO type, and the above SBFD RSRP threshold usage is set to above, Based on the fact that the RSRP measured in the above UE is greater than the SBFD RSRP threshold, the above initial RO type is determined as the above additional RO; and Causing the initial RO type to be determined as the legacy RO based on the fact that the RSRP measured in the above UE is not greater than the SBFD RSRP threshold, UE.

18. In Claim 11, The above at least one processor is the UE, If the transmission of the above RA preamble fails, the above RA preamble is retransmitted to the base station; Switching the initial RO type to another RO type based on the fact that the number of transmissions of the above RA preamble has reached the maximum number of transmissions indicated by the information included in the above SBFD RA setting information; and Further causing the RA preamble to be retransmitted to the base station in the above other RO type, and The above maximum number of transmissions indicates the maximum number of transmissions of the above RA preamble in the same RO type, UE.

19. In Claim 18, In the procedure for switching the above initial RO type to another RO type, the above at least one processor is the UE, Based on the fact that the initial RO type is the legacy RO, there exists an additional RO that supports the same function or combination of functions associated with the legacy RO, and there exists an additional RO that supports a number of repetitions set greater than or equal to the number of repetitions of the RA preamble associated with the legacy RO, causing the RO type for RA preamble transmission to be switched from the legacy RO to the additional RO, UE.

20. In Claim 18, In the procedure for switching the above initial RO type to another RO type, the above at least one processor is the UE, Based on the fact that the initial RO type is the additional RO, there exists a legacy RO that supports the same function or combination of functions associated with the additional RO, and there exists a legacy RO that supports a number of repetitions set greater than or equal to the number of repetitions of the RA preamble associated with the additional RO, causing the RO type for RA preamble transmission to be switched from the additional RO to the legacy RO, UE.

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