Terminal, wireless communication system, and wireless communication method

Abstract

This terminal comprises: a transmission unit that transmits a random access preamble; and a control unit that determines, according to a type of a resource to which the preamble is transmitted, a resource for transmitting a signal related to random access after the preamble.

Description

Terminal, wireless communication system, and wireless communication method

[0001] The present disclosure relates to a terminal, a wireless communication system, and a wireless communication method.

[0002] The 3rd Generation Partnership Project (3GPP) has developed specifications for the 5th generation mobile communication system (5G, also known as New Radio (NR) or Next Generation 10 (NG)), and is also developing specifications for the next generation of mobile communication systems, known as Beyond 5G, 5G Evolution, or 6G.

[0003] Release 18 discusses a duplexing scheme that enables simultaneous use of downlink (DL) and uplink (UL) by utilizing multiple subbands that make up a time division duplexing (TDD) band. This duplexing scheme is called subband non-overlapping full duplex (SBFD). Symbols to which SBFD is applied may also be called SBFD symbols. In addition, in SBFD symbols, subbands used for DL ​​may also be called DL subbands, and subbands used for UL may also be called UL subbands.

[0004] Furthermore, support for random access (RA) in SBFD is being considered for Release 19 (Non-Patent Document 1). Specifically, it is being considered to extend the configuration related to the random access channel (RACH) (RACH configuration) to the SBFD symbol.

[0005] In addition, the terminal (hereinafter also referred to as user equipment (UE)) determines a random access opportunity (RO) for transmitting a preamble to initiate random access (RA) based on the RACH setting from the base station (hereinafter also referred to as gNodeB (gNB)), and further determines a valid RO (and an invalid RO) from the determined ROs.

[0006] “New WID: Evolution of NR duplex operation: Sub-band full duplex (SBFD)”, RP-234035, 3GPP TSG RAN Meeting #102, 3GPP, December 11-15, 2023

[0007] However, in random access in SBFD, the RO is shared between UEs that support SBFD operation and UEs that do not support SBFD operation, which increases the resources required for random access.

[0008] One aspect of the present disclosure provides a terminal, a wireless communication system, and a wireless communication method that can suppress an increase in resources for random access.

[0009] A terminal according to one aspect of the present disclosure includes a transmitting unit that transmits a random access preamble, and a control unit that determines a resource for transmitting a signal related to the random access after the preamble depending on the type of resource on which the preamble is transmitted.

[0010] 1 is a diagram showing an overall schematic configuration of a wireless communication system. 2 is a diagram showing a frequency range used in the wireless communication system. 3 is a diagram showing an example of the configuration of a radio frame, subframe, slot, and symbol used in the wireless communication system. 4 is a diagram showing an example of TDD configuration specified up to Rel. 16. 5 is a diagram showing an example of the configuration of SBFD. 6 is a diagram showing an example of SBFD operation. 7 is a diagram showing an example of existing TDD configuration. 8 is a diagram showing an example of TDD including SBFD configuration. 9 is a diagram showing a pure time unit and an SBFD time unit. 10 is a diagram showing a pure time unit and an SBFD time unit. 11 is a diagram showing a pure time unit and an SBFD time unit. 12 is a diagram showing a pure time unit and an SBFD time unit. 13 is a sequence diagram showing an example of a CBRA procedure. 14 is a sequence diagram showing another example of the CBRA procedure. 15 is a sequence diagram showing an example of a CFRA procedure. 16 is a diagram showing an example of application of an extended rule for determining a valid RO. 17 is a diagram showing an example of application of an extended rule for determining a valid RO. 18 is a diagram showing an example of application of an extended rule for determining a valid RO. 19 is a diagram showing an example of application of an extended rule for determining a valid RO. FIG. 1 is a diagram illustrating an example of application of an extended rule for determining valid ROs. FIG. 2 is a diagram illustrating an example of Proposal 1. FIG. 3 is a diagram illustrating an example of Option 1-A. FIG. 4 is a diagram illustrating a first example of repetition of PUSCH transmission. FIG. 5 is a diagram illustrating a second example of repetition of PUSCH transmission. FIG. 6 is a diagram illustrating a third example of repetition of PUSCH transmission. FIG. 7 is a diagram illustrating an example of Proposal 2. FIG. 8 is a block diagram illustrating an example of a configuration of a base station according to an embodiment of the present disclosure. FIG. 9 is a block diagram illustrating an example of a configuration of a terminal according to an embodiment of the present disclosure. FIG. 10 is a diagram illustrating an example of the hardware configuration of a base station and a terminal according to an embodiment of the present disclosure. FIG. 11 is a diagram illustrating an example of the configuration of a vehicle according to an embodiment of the present disclosure.

[0011] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and descriptions thereof will be omitted as appropriate.

[0012] 1 is a wireless communication system conforming to a method called 5G. Alternatively, the wireless communication system 10 may be a wireless communication system conforming to a method called Beyond 5G, 5G Evolution, or 6G.

[0013] The wireless communication system 10 can support Massive Multiple-Input Multiple-Output (Massive MIMO), which generates more directional beams by controlling wireless signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which uses multiple component carriers (CCs) as a bundle, and Dual Connectivity (DC), which enables simultaneous communication with two base stations.

[0014] As shown in FIG. 1 , the wireless communication system 10 includes a base station 100 (hereinafter also referred to as a gNodeB (gNB) 100) constituting a Next Generation-Radio Access Network (NG-RAN) 20, and a terminal 200 (hereinafter also referred to as a user equipment (UE) 200) that performs wireless communication with the gNB 100. The NG-RAN 20 is connected to a core network (CN) (not shown). The CN is composed of multiple network functions (NFs). The NFs are, for example, an access and mobility management function (AMF) and a network data analytics function (NWDAF). The AMF performs, for example, registration of the UE 200. The NWDAF performs, for example, optimization of the CN. Note that the specific configuration of the wireless communication system 10, for example, the number of gNBs 100 and UEs 200, is not limited to the example shown in FIG. 1 . The NG-RAN 20 and the CN may be simply referred to as a "network."

[0015] The gNB100 may be a base station in a Centralized-Radio Access Network (C-RAN) configuration having a distributed unit (DU) having a function for connecting to the UE200 and a central unit (CU) having a function for connecting to the network. In this case, the gNB100 may be read as a DU, a CU, or a DU and a CU. When the gNB100 is read as a DU, it may be called a gNB-DU. When the gNB100 is read as a CU, it may be called a gNB-CU. When the gNB100 is read as a DU and a CU, the DU portion may be called a gNB-DU and the CU portion may be called a gNB-CU.

[0016] The wireless communication system 10 may also support multiple frequency ranges (FR). That is, as shown in Fig. 2, the wireless communication system 10 may support the following FRs: FR1: 410 MHz to 7.125 GHz FR2-1: 24.25 GHz to 52.6 GHz FR2-2: Over 52.6 GHz to 71 GHz

[0017] In FR1, a subcarrier spacing (SCS) of 15, 30, or 60 kHz and a bandwidth (BW) of 5 to 100 MHz may be used, while in FR2-1, an SCS of 60 or 120 kHz (or even 240 kHz) and a BW of 50 to 400 MHz may be used.

[0018] Note that SCS may be interpreted as numerology, which is defined in 3GPP TS 38.300 and corresponds to one subcarrier spacing in the frequency domain.

[0019] In FR2-2, to avoid an increase in phase noise, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) or Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) with a larger SCS may be applied.

[0020] 3 is a diagram showing an example of the configuration of a radio frame (system frame), subframe, and slot used in the radio communication system 10. As shown in FIG. 3, one slot is composed of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). However, the SCS is not limited to the interval (frequency) shown in FIG. 3. For example, 480 kHz, 960 kHz, etc. may be used as the SCS.

[0021] Furthermore, the number of symbols constituting one slot does not necessarily have to be 14 (for example, it may be 28 or 56 symbols, etc.) Furthermore, the number of slots per subframe may differ depending on the SCS.

[0022] 3 may be called a time domain, a symbol period, a symbol time, etc. The frequency direction may be called a frequency domain, a resource block, a subcarrier, a bandwidth part (BWP), etc.

[0023] The wireless communication system 10 may support coverage enhancement (CE) that expands the coverage of a cell (or a physical channel) formed by the gNB 100. In coverage enhancement, a mechanism for increasing the success rate of reception of various physical channels, such as repeated transmission (repetition) of a PRACH (physical random access channel), may be provided.

[0024] For example, UE200 receives information related to the random access procedure from gNB100 as a downlink (DL) signal (e.g., SIB1 (System Information Block Type 1) etc.).

[0025] Further, for example, UE 200 transmits PRACH as an UL signal to gNB 100 using a RACH occasion (RO), which is a resource for transmitting a random access preamble. For example, UE 200 repeatedly transmits PRACH as an UL signal to gNB 100.

[0026] The UL signal may include, for example, a UL data signal and control information. For example, the UL signal may include information related to the processing capability of the UE 200 (e.g., UE capability). The UL signal may also include a reference signal.

[0027] Channels used for transmitting UL signals include, for example, data channels and control channels. For example, the data channel may include a physical uplink shared channel (PUSCH), and the control channel may include a physical uplink control channel (PUCCH). For example, the UE 200 transmits control information using the PUCCH and transmits UL data signals using the PUSCH. Note that the PUSCH is an example of an uplink shared channel, and the PUCCH is an example of an uplink control channel. The shared channel may also be called a data channel.

[0028] The reference signal included in the UL signal may include, for example, at least one of a Demodulation Reference Signal (DMRS), a Phase Tracking Reference Signal (PTRS), a Channel State Information - Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information. For example, reference signals such as the DMRS and PTRS are used to demodulate the UL data signal and are transmitted using the PUSCH.

[0029] Meanwhile, in response to the operation of UE200, gNB100 transmits information related to the RACH procedure to UE200 as a DL signal (e.g., SIB1, etc.).

[0030] Also, for example, gNB100 receives PRACH as an UL signal from UE200. For example, gNB100 repeatedly receives PRACH from UE200 as an UL signal.

[0031] Channels used for transmitting DL signals include, for example, data channels and control channels. For example, the data channel may include a physical downlink shared channel (PDSCH), and the control channel may include a physical downlink control channel (PDCCH). For example, the gNB 100 transmits control information to the UE 200 using the PDCCH, and transmits DL data signals using the PDSCH. Note that the PDSCH is an example of a downlink shared channel, and the PDCCH is an example of a downlink control channel. Note that the PDCCH may be interpreted as downlink control information (DCI), control information, etc. transmitted in the PDCCH.

[0032] The reference signal included in the DL signal may include, for example, at least one of a DMRS, a PTRS, a CSI-RS, an SRSRS, and a PRS for location information. For example, the reference signal such as the DMRS or the PTRS is used for demodulating the DL data signal and is transmitted using the PDSCH.

[0033] Support for random access (RA) in SBFD is being considered for Release 19. The following describes SBFD and random access.

[0034] (SBFD Operation) Considering the time ratio (e.g., DL:UL = 4:1) of transmission and reception using Time Division Duplex (TDD) up to Rel. 16, there may be cases where the number of transmission opportunities for UL signals / channels is fewer than the number of reception opportunities for DL ​​signals / channels. In such cases, UE 200 cannot frequently transmit UL signals / channels, and there is a concern that transmission delays of important UL signals / channels may occur. In addition, since there are fewer UL transmission opportunities compared to DL reception opportunities, there is also a concern that signal / channel congestion may occur during UL transmission opportunities. Furthermore, in TDD, the time resources available for transmitting UL signals / channels are limited, which limits the application of UL coverage extension techniques, for example, through repetition transmission.

[0035] In future wireless communication systems (for example, Rel. 18 and later), the introduction of a time-frequency division duplexing method that combines TDD and frequency division duplexing (FDD) for UL and DL is being considered.

[0036] Examples of the time-frequency division duplexing method include XDD (Cross Division Duplex) or Subband Non-Overlapping Full Duplex (SBFD). XDD or SBFD may refer to a duplexing method in which DL and UL are frequency-division multiplexed within one component carrier (CC) of the TDD band (DL and UL can be used simultaneously).

[0037] Fig. 4A is a diagram showing an example of TDD configuration defined up to Rel. 16. In the example shown in Fig. 4A, TDD slots or symbols are configured for a UE in a bandwidth such as one component carrier (CC) (which may also be called a cell or a serving cell) or bandwidth portion (BWP).

[0038] In the example shown in Fig. 4A, the time ratio of DL slots to UL slots is 4: 1. In such a conventional TDD slot or symbol setting, UL time resources cannot be sufficiently secured, which may result in UL transmission delays and degradation of coverage performance.

[0039] 4B is a diagram showing an example of the configuration of SBFD. In the example shown in FIG. 4B, within one component carrier (CC), resources used for DL ​​reception and resources used for UL transmission overlap in time. With this resource configuration, more UL resources can be secured, thereby improving resource utilization efficiency.

[0040] For example, as shown in the example of Fig. 4B, both ends of the frequency domain may be set as DL resources, and these DL resources may sandwich UL resources. This may prevent or mitigate cross link interference (CLI) with neighboring carriers. Furthermore, a guard region may be set at the boundary between the DL resource and the UL resource.

[0041] Considering the complexity of processing self-interference, it may be considered that only the base station 100 uses the DL resource and the UL resource simultaneously. That is, in radio resources where the DL and UL overlap in time, one UE 200 may use the DL resource and another UE 200 may use the UL resource.

[0042] Fig. 5 is a diagram showing an example of SBFD operation. In the example shown in Fig. 5, part of the DL resources of the TDD band is configured as UL resources, and the DL and UL are configured to partially overlap in the time domain.

[0043] In the example shown in FIG. 5, during the DL-only period, each of the multiple UEs 200 (UE #1 and UE #2 in FIG. 5) receives the DL channel / signal.

[0044] Furthermore, during a period in which DL and UL overlap in time, one UE 200 (UE #1 in the example of FIG. 5) receives a DL channel / signal, and another UE 200 (UE #2 in the example of FIG. 5) transmits a UL channel / signal. During this period, the base station 100 performs simultaneous transmission and reception of DL and UL.

[0045] Furthermore, during the UL-only period, each of the multiple UEs 200 (UE #1 and UE #2 in FIG. 5) transmits a UL channel / signal.

[0046] In the existing NR (for example, as defined by Rel. 15 / 16 / 17), the DL frequency resource and the UL frequency resource in the UE carrier are configured as the DL BWP and the UL BWP, respectively. In order to switch the DL / UL frequency resource to another DL / UL frequency resource, multiple BWP configurations and a BWP adaptation mechanism are required.

[0047] 6A is a diagram showing an example of an existing TDD configuration. In FIG. 6A, slots / symbols marked with "D" are DL slots / symbols, slots / symbols marked with "U" are UL slots / symbols, and slots / symbols marked with "F" are flexible (hereinafter also referred to as FL) slots / symbols. Note that similar notations may be used in the following figures.

[0048] In the existing NR, as shown in FIG. 6A, the time resources (time units such as symbols, slots, etc.) in the TDD carrier for UE 200 are configured as at least one of DL, UL, and flexible (FL) in the TDD configuration.

[0049] 6B is a diagram showing an example of TDD including SBFD configuration. In FIG. 6B, slots / symbols or subbands marked with "D" are DL slots / symbols or DL ​​subbands, and slots / symbols or subbands marked with "U" are UL slots / symbols or UL subbands. Note that similar notations may be used in the following figures.

[0050] As shown in FIG. 6B , the SBFD symbol may be a symbol that is signaled or configured as UL (or DL) or for UL transmission (or DL ​​reception) on some frequency resources (subbands), and signaled or configured as DL (or UL) or for DL ​​reception (or UL transmission) on other frequency resources (subbands). Alternatively, the SBFD symbol may be a symbol that is signaled or configured as UL (or DL) or for UL transmission (or DL ​​reception) on a portion of the frequency resources. Alternatively, the SBFD symbol may be a symbol that is signaled or configured as DL (or UL) or for DL ​​reception (or UL transmission) on a portion of the frequency resources.

[0051] Here, the time unit may be at the symbol level, slot / subslot level, or a group of symbols / slots / subslots, i.e., an SBFD time unit may be an SBFD symbol, a slot / subslot containing or overlapping an SBFD symbol, or a group of symbols / slots / subslots containing or overlapping an SBFD symbol.

[0052] A pure time unit may be a non-SBFD symbol (i.e., a symbol that is not an SBFD symbol, also referred to as a non-SBFD symbol), a slot / subslot that does not contain or overlap an SBFD symbol, or a group of symbols / slots / subslots that do not contain or overlap an SBFD symbol, and may also be referred to as a non-SBFD time unit. For example, a pure time unit may be referred to as a time unit consisting only of DL on a frequency resource as shown in Figure 7A, or as a time unit consisting only of UL on a frequency resource as shown in Figure 7B.

[0053] Furthermore, for an SBFD time unit, DL resources and UL resources may have various allocation patterns in the frequency domain. For example, an SBFD time unit of frequency domain pattern #1 may have an allocation pattern as shown in FIG. 7C . An SBFD time unit of frequency domain pattern #2 may have an allocation pattern as shown in FIG. 7D . An SBFD time unit of frequency domain pattern #3 may have an allocation pattern as shown in FIG. 7E . These allocation patterns are merely exemplary, and other allocation patterns may be used. The frequency domain pattern of an SBFD time unit may refer to a resource repetition pattern in the frequency domain for the SBFD time unit.

[0054] As described above, SBFD may be applied to each slot / symbol. Note that each slot / symbol may be set to DL, UL, or Flexible (FL) that can be used as DL or UL, and then SBFD may be applied.

[0055] SBFD is a type of (full-duplex) duplexing scheme based on time division duplexing (TDD), enabling simultaneous use of multiple sub-bands that make up the TDD band. SBFD can be described as a duplexing scheme in which multiple sub-bands are specified within the TDD band, a duplexing scheme in which UL and DL are allocated non-overlapping in the frequency direction within the TDD time unit, or full-duplex duplexing of sub-bands.

[0056] A symbol to which SBFD is applied is also called an SBFD symbol. "SBFD is applied" may be interpreted as SBFD being applied to at least a part of scheduling. In other words, "a symbol to which SBFD is applied" may be interpreted as a symbol to which SBFD is applied (SBFD symbol) in scheduling to which SBFD is applied. Also, "a time unit to which non-SBFD is applied" may be interpreted as a symbol to which SBFD is not applied (non-SBFD symbol) in scheduling to which SBFD is applied.

[0057] Furthermore, a UE that supports SBFD operation is referred to as an SBFD-aware UE, and a UE that does not support SBFD operation is referred to as a legacy UE. For example, when SBFD is applied to a DL symbol, an SBFD-aware UE can recognize the UL subband (and DL subband) in this SBFD symbol, but a legacy UE recognizes this SBFD symbol as a normal DL symbol.

[0058] The following explains the terms related to SBFD. SBFD DL symbol: A symbol instructed to DL by tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated, and a symbol for which an SBFD subband is set. SBFD FL symbol: A symbol instructed to FL by tdd-UL-DL-ConfigurationCommon and / or tdd-UL-DL-ConfigurationDedicated, and a symbol for which an SBFD subband is set. SBFD SSB (Synchronization Signal Block) symbol: A symbol set for SSB reception, and a symbol for which an SBFD subband is set. Non-SBFD symbol: A symbol for which an SBFD subband is not set, and / or a symbol for which SBFD operation is not performed on the gNB side.

[0059] <Random Access Procedure> The NR random access procedure is performed for various purposes such as initial access, recovery from beam interference, handover, etc. The random access procedure includes a CBRA (Contention Based Random Access) procedure as a contention-based random access procedure and a CFRA (Contention Free Random Access) procedure as a contention-free random access procedure. Since the CBRA procedure is initiated by the UE 200 voluntarily, collisions may occur when multiple UEs 200 simultaneously initiate the random access procedure. On the other hand, CFRA allows the gNB 100 to instruct the connected UE 200 to perform the random access procedure so that collisions do not occur between multiple UEs 200.

[0060] In NR, a random access procedure may be performed by selecting a Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block, or by selecting a CSI-RS. The SS / PBCH block may be referred to as an SSB or synchronization signal, and the CSI-RS may be referred to as a reference signal.

[0061] FIG. 8 is a sequence diagram illustrating an example of a CBRA procedure.

[0062] For example, the gNB 100 transmits an SSB for each beam, and the UE 200 monitors the SSB of each beam. The UE 200 selects an SSB from among the multiple SSBs whose received power (RSRP: Reference Signal Received Power) is greater than a threshold (or is equal to or greater than a threshold), and transmits a random access preamble to the gNB 100 via a PRACH using an RO associated with (corresponding to) the selected SSB (step S101). The random access preamble (sometimes abbreviated as an RA preamble or RA preamble) may be appropriately referred to as a preamble, a PRACH preamble, a message 1, an Msg1, or the like.

[0063] The gNB 100 transmits a response message to Msg1 as a second message to the UE 200 via the PDSCH (step S102). This response message (second message) may be appropriately referred to as a random access response (RAR), RA Response, message 2 (Message 2), Msg2, or the like. After transmitting Msg1, the UE 200 may monitor the PDCCH used for scheduling the PDSCH including Msg2. Msg2 may include an uplink grant (UL Grant) (RAR uplink grant) used for scheduling the PUSCH including the third message transmitted by the UE 200.

[0064] The UE 200 transmits the PUSCH scheduled by the RAR uplink grant as a third message (step S103). For example, the UE 200 transmits a radio resource control (RRC) connection request, an RRC connection re-establishment request, or the like to the gNB 100 via the PUSCH. The third message may be appropriately referred to as a message 3, Msg 3, an RRC connection request, or the like.

[0065] The gNB 100 transmits a contention resolution message (Contention Resolution Message) as a fourth message via the PDSCH (step S104). This contention resolution message (fourth message) may be referred to as Message 4, Msg 4, or the like, as appropriate. After transmitting Msg 3, the UE 200 may monitor the PDCCH used for scheduling the PDSCH including Msg 4. Msg 4 may include a contention resolution ID (UE contention resolution ID). The contention resolution ID may be used to resolve contention between multiple UEs 200 transmitting signals using the same radio resources. If the contention resolution ID included in the Msg 4 received by the UE 200 is the same value as the ID for identifying the UE 200, the UE 200 determines that contention resolution is successful and may set the value of the Temporary Cell-Radio Network Temporary Identifier (TC-RNTI) in the Cell-Radio Network Temporary Identifier (C-RNTI) field. When the value of the TC-RNTI is set in the C-RNTI field, the UE 200 may consider that the RRC connection is completed. Msg4 may be referred to as an RRC connection setup, etc.

[0066] UE200, whose RRC connection has been completed, may transmit an Ack (Acknowledgement) via the PUCCH (PUCCH resource) indicated by the PUCCH resource indication field included in the PDCCH that scheduled Msg4 in order to notify gNB100 that the RRC connection has been completed. Also, after the RRC connection is established, UE200 may transmit UE capability to gNB100. The above-described random access procedure may be referred to as a Type 1 RACH procedure, a 4-step RACH procedure, a Type 1 RACH, a 4-step RACH, or the like.

[0067] FIG. 9 is a sequence diagram showing another example of the CBRA procedure.

[0068] The UE 200 transmits a message including an RA preamble and data to the gNB 100 (step S201). As an example, the UE 200 selects an RO in the same manner as selecting an RO in the 4-step RACH procedure, transmits an RA preamble in the RO, and transmits data in a PUSCH resource associated with the RO. This message may be appropriately referred to as Message A, Msg A, etc. Note that the RA preamble and data here may correspond to Msg 1 and Msg 3 in the 4-step RACH procedure, respectively. Msg A includes one RA preamble (referred to as Msg A PRACH) and one piece of data (referred to as Msg A PUSCH), and the Msg A PRACH and Msg A PUSCH are time-division multiplexed and transmitted. More specifically, the MsgA PRACH is one preamble with one preamble index in the MsgA RACH occasion (RO), and the MsgA PUSCH is one PUSCH with one PUSCH resource unit (PRU) in the MsgA PUSCH occasion (PO) according to the MsgA PUSCH configuration. Note that in this procedure, the resources for transmitting data are not limited to PUSCH resources, and may be resources of any channel for transmitting data (or control information).

[0069] The gNB 100 transmits the response message to the UE 200 as a second message (step S202). This response message (second message) may be appropriately referred to as Message B, Msg B, or the like. The content included in Message B may correspond to, for example, Msg2 and Msg4 in the 4-step RACH procedure. MsgB includes one PDSCH (and one PDCCH that schedules the PDSCH). From the perspective of the physical layer, the content of Msg2 and Msg4 is simply integrated into MsgB.

[0070] The UE 200, whose RRC connection has been completed, may transmit an Ack via the PUCCH (PUCCH resource) to notify the gNB 100 that the RRC connection has been completed. Also, after the RRC connection is established, the UE 200 may transmit UE capability to the gNB 100. The above-described random access procedure may be referred to as a Type 2 RACH procedure, a 2-step RACH procedure, a Type 2 RACH, a 2-step RACH, or the like. The 2-step RACH is supported to shorten the RACH delay.

[0071] FIG. 10 is a sequence diagram illustrating an example of a CFRA procedure.

[0072] The UE 200 is requested to transmit an RA preamble (Msg1) from the gNB 100. Here, the gNB 100 allocates the RA preamble (Msg1) via dedicated signaling (step S301). The PDCCH for such dedicated signaling may be referred to as a PDCCH order. The UE 200 may monitor the PDCCH (PDCCH order) to perform resource allocation for Msg1.

[0073] UE200 transmits the above-mentioned Msg1 to gNB100 (step S302).

[0074] The gNB100 transmits the above-mentioned Msg2 to the UE200 (step S303). After the RRC connection is completed, the UE200 may transmit an Ack via the PUCCH (PUCCH resource) to notify the gNB100 that the RRC connection has been completed. After the RRC connection is established, the UE200 may transmit the UE capability to the gNB100.

[0075] In this embodiment, in order to extend coverage in the random access procedure, UE 200 may repeatedly transmit Msg1 (and therefore PRACH) in, for example, the above-described 4-step RACH procedure shown in Fig. 8 and the CFRA procedure shown in Fig. 10. However, in the present disclosure, Msg1 (and therefore PRACH) may also be repeatedly transmitted in the above-described 2-step RACH procedure shown in Fig. 9.

[0076] In the above-mentioned random access, the UE determines a random access opportunity to transmit a preamble to start the random access, and determines a valid RO (and an invalid RO) from the determined ROs. Note that the random access opportunity may also be referred to as a RACH Occasion. Next, the determination of a valid RO will be described.

[0077] <Regarding Valid RO Determination> Extended rules for determining a valid RO will be described with reference to Figures 11 to 15. Legacy rules for determining a valid RO will also be described. In the figures, Legacy UE refers to a UE that cannot recognize an SBFD symbol, and SBFD-aware UE refers to a UE that can recognize an SBFD symbol. For example, for an SBFD symbol that is set to a DL symbol or an FL symbol, Legacy UE regards it as a DL symbol or an FL symbol, and SBFD-aware UE regards it as an SBFD symbol.

[0078] The legacy rule for determining a valid RO is that an RO in an UL symbol (UL sub-band) or an FL symbol (not configured for SSB) as seen from the UE is considered a valid RO, and an RO in a DL symbol (DL sub-band) or an FL symbol (configured for SSB) as seen from the UE is considered an invalid RO.

[0079] The extended rule for determining a valid RO may be configured by the conditions for determining a valid RO shown below. Note that the extended rule for determining a valid RO is a rule for a cell in which SBFD operation is configured on the gNB side. Note that Cond-X in the figure corresponds to condition X.

[0080] Condition 1: Each symbol is a UL symbol. Condition 2: Each symbol is an FL symbol not configured for SSB. Condition 3: Each symbol is a UL symbol or an FL symbol not configured for SSB (non-SBFD). Condition 4: Each symbol is an SBFD symbol (e.g., an SBFD DL symbol, and / or an SBFD FL symbol, and / or an SBFD SSB symbol). Condition 5: Each symbol is an SBFD symbol (e.g., an SBFD DL symbol, and / or an SBFD FL symbol, and / or an SBFD SSB symbol) or a UL symbol (or an FL symbol not configured for SSB, or an FL symbol not configured for SSB (non-SBFD)).

[0081] Condition 6: At least N_gap symbols must be spaced after the last (non-SBFD) DL symbol, and / or at least N_gap symbols must be spaced after the last (non-SBFD) SSB symbol, and / or must not precede an SSB symbol in the same PRACH slot (a non-SBFD symbol). Condition 7: Must not overlap with both a non-SBFD symbol (e.g., a UL symbol or a non-SBFD FL symbol) and an SBFD symbol (e.g., an SBFD DL symbol, and / or an SBFD FL symbol, and / or an SBFD SSB symbol). Condition 8: Must not overlap with a non-SBFD DL symbol or a (non-SBFD) SSB symbol. Condition 9: Must not overlap with RBs outside the UL subband in an SBFD symbol (e.g., an SBFD DL symbol, and / or an SBFD FL symbol, and / or an SBFD SSB symbol).

[0082] That is, valid ROs in the extended rules for determining valid ROs may include ROs that satisfy one or more combinations of these conditions. One or more combinations of the above conditions may be predefined in the standard or may be set by the gNB. For example, valid ROs may include the following ROs:

[0083] ・Example 1: An RO that satisfies condition 1 (determined as a valid RO even under the legacy rules) ・Example 2: An RO that satisfies conditions 2 / 3 and 6 Example 2-1: If the parenthesized statement regarding non-SBFD in condition 6 does not apply, the RO will be determined as a valid RO even under the legacy rules Example 2-2: If the parenthesized statement regarding non-SBFD in condition 6 applies, the RO may be determined as an invalid RO under the legacy rules. This is because the conditions for determining a valid RO in this case are more relaxed. ・Example 3: An RO that satisfies conditions 2 / 3 and 9 (and condition 6) ・Example 4: An RO that satisfies condition 4 (and condition 6) ・Example 5: An RO that satisfies conditions 4 and 9 (and condition 6) ・Example 6: An RO that satisfies condition 5 (and condition 6) ・Example 7: An RO that satisfies condition 5 and condition 9 (and condition 6) ・Example 8: An RO that satisfies condition 7 (and at least one of conditions 6 / 8) ・Example 9: An RO that satisfies conditions 7 and 9 (and at least one of conditions 6 / 8)

[0084] 11 shows an example (Example A-1) in which SBFD is applied to DL symbols. An RO that satisfies condition 4 (and does not satisfy condition 9) and an RO that satisfies condition 1 are determined as valid ROs.

[0085] 12 shows an example (Example A-2) in which SBFD is applied to DL symbols. An RO that satisfies conditions 4 and 9 and an RO that satisfies condition 1 are determined as valid ROs.

[0086] 13 shows an example (Example B-1) in which SBFD is applied to DL symbols and FL symbols. An RO that satisfies condition 4 (and does not satisfy condition 9), an RO that satisfies condition 1, and an RO that satisfies conditions 3 and 6 are determined as valid ROs.

[0087] 14 shows an example (Example B-2) in which SBFD is applied to DL symbols and FL symbols. An RO that satisfies condition 4 (when the SBFD symbol in condition 4 does not include an SBFD FL symbol) and condition 9, an RO that satisfies condition 1, and an RO that satisfies conditions 3 and 6 are determined as valid ROs.

[0088] 15 shows an example (Example B-3) in which SBFD is applied to DL symbols and FL symbols. An RO that satisfies condition 4 (when the SBFD symbol in condition 4 includes an SBFD FL symbol) and condition 9, an RO that satisfies condition 1, and an RO that satisfies conditions 3 and 6 are determined as valid ROs.

[0089] As described above, it is considered that a valid RO is determined and random access is performed in the valid RO.

[0090] <Considerations in Rel-19> In Rel-19 (Release 19), as an extension of duplexing, SBFD operation is being considered to support random access using SBFD symbols by UEs in RRC CONNECTED mode. SBFD operation for UEs in RRC_IDLE / INACITVE mode for random access is also being considered.

[0091] For SBFD-aware UEs in the RRC CONNECTED state, the following points are considered for transmission and reception related to messages (e.g., Msg 2, Msg 3, and Msg 4) in random access within SBFD symbols: Reception of Msg 2 (and / or Msg 4 PDSCH) in DL subband Frequency resource allocation and frequency hopping for Msg 3 PUSCH (and / or Msg 4 HARQ-ACK PUCCH) Repetition of Msg 3 Power control of Msg 3 PUSCH (and / or Msg 4 HARQ-ACK PUCCH) Whether and how the gNB identifies whether a UE is SBFD-aware or non-SBFD-aware UE

[0092] In this embodiment, the repetition of the above Msg 3 and the gNB's identification of whether the UE is SBFD aware UE or non-SBFD aware UE will be described. Note that a non-SBFD aware UE may correspond to a legacy UE.

[0093] As described above, in random access, the UE transmits the PUSCH scheduled by the RAR uplink grant as Msg 3. The PUSCH transmitted as Msg 3 may be referred to as Msg 3 PUSCH. Furthermore, when the RRC connection is completed, the UE transmits an Ack (Acknowledgement) via the PUCCH (PUCCH resource) indicated by the PUCCH resource indication field included in the PDCCH that scheduled Msg 4 in order to notify the gNB 100 that the RRC connection has been completed. The PUCCH transmitted here may be referred to as Msg 4 HARQ-ACK PUCCH. Below, the time domain resources (e.g., slots) of the Msg 3 PUSCH and the Msg 4 HARQ-ACK PUCCH will be described.

[0094] <Msg 3 PUSCH> If the UE requests repetition for PUSCH transmission, the UE ｒｅｐｅａｔ ＰＵＳＣＨ PUSCH is transmitted in slot N. ｒｅｐｅａｔ ＰＵＳＣＨ indicates the number of slots in which PUSCH repetition is performed. ｒｅｐｅａｔ ＰＵＳＣＨmay be written as "N^repeat_PUSCH". N^repeat_PUSCH is the number of slots from a specific set indicated by the two most significant bits (MSBs) of the MCS (Modulation and Coding Scheme) field of the RAR UL grant or DCI format 0_0. Note that the specific set may be a set of four values ​​provided by numberOfMsg3Repetitions. Alternatively, if numberOfMsg3Repetitions is not provided, the specific set may be a set of four values: 1, 2, 3, and 4.

[0095] The UE determines the MCS for PUSCH transmission based on the 2 LSBs (Least Significant Bits) of the MCS field of the RAR UL grant or the 3 LSBs of the MCS field of DCI format 0_0. The UE also determines the RB and redundancy version for each repetition.

[0096] Note that for unpaired spectrum operation, the UE determines the N^repeat_PUSCH slots as the first N^repeat_PUSCH slots starting from slot n+k_2+Δ, where the repetition of PUSCH transmission does not include symbols indicated as DL by tdd-UL-DL-ConfigurationCommon or symbols of SS / PBCH blocks with indices provided by ssb-PositionsInBurst.

[0097] Here, n indicates a reference slot (e.g., a slot in which DCI is received), k_2 is a value provided by a PUSCH setting (e.g., a PUSCH configuration), and Δ may be a value specified by the SCS of the PUSCH.

[0098] <Msg 4 HARQ-ACK PUCCH> A UE that does not have a dedicated PUCCH resource configuration and indicates the capability to perform transmission including repetition of PUCCH including HARQ-ACK information, based on the indication in numberOfPUCCHforMsg4HARQACK-RepetitionsList, sets N indicating the number of slots for repetition of PUCCH transmission including HARQ-ACK information. ｒｅｐｅａｔ ＰＵＣＣＨ In the following, N ｒｅｐｅａｔ ＰＵＣＣＨ may be written as "N^repeat_PUCCH".

[0099] If numberOfPUCCHforMsg4HARQACK-RepetitionsList provides a value greater than 1, the downlink assignment index (DAI) field of DCI format 1_0, which includes a cyclic redundancy check (CRC) scrambled by a Temporary Cell - Radio Network Temporary Identifier (TC-RNTI) that schedules PDSCH reception including a UE contention resolution identity, indicates N^repeat_PUCCH from among values ​​greater than 1.

[0100] <Analysis> According to the Rel-19 study, random access in SBFD symbols for UEs in RRC_IDLE / IN_ACTIVE mode is being considered, and random access in SBFD symbols for UEs in RRC_CONNECTED mode is being specified.

[0101] In random access, a UE transmits the above-mentioned Msg 3 PUSCH and / or Msg 4 HARQ-ACK PUCCH, but, for example, an SBFD-aware UE may transmit the Msg 3 PUSCH and / or Msg 4 HARQ-ACK PUCCH in an SBFD symbol. The Msg 3 PUSCH and / or Msg 4 HARQ-ACK PUCCH are examples of signals (or information) related to random access after the preamble.

[0102] When PRACH transmission (e.g., preamble transmission) is performed in an RO (RACH occasion) of a non-SBFD symbol, considering that the RO of the non-SBFD symbol may be shared with legacy UEs from the perspective of gNB configuration / implementation, a separate preamble resource is required when the UE plans to report its capability for the PRACH. For example, even if PRACH transmission is performed in an RO of a non-SBFD symbol, one or more ROs of the non-SBFD symbol may be based on a separate RACH configuration, considering that the RO of the non-SBFD symbol may be shared with legacy UEs, a separate preamble resource is required when the UE plans to report its capability for the PRACH.

[0103] In this way, if individual preamble resources are required, the preamble resources will increase, which may result in random access not being performed properly, delays in random access, or a decrease in the number of UEs that can perform random access.

[0104] In order to suppress an increase in preamble resources, it is considered that the UE capability of transmitting Msg 3 PUSCH and / or Msg 4 HARQ-ACK PUCCH in the SBFD symbol is indicated by transmitting PRACH in the SBFD symbol.

[0105] For example, if the UE transmits the PRACH in an SBFD symbol, the subsequent Msg 3 PUSCH transmission and / or Msg 4 HARQ-ACK PUCCH transmission may occur in an SBFD symbol, otherwise the Msg 3 PUSCH transmission and / or Msg 4 HARQ-ACK PUCCH transmission will only use legacy valid UL resources.

[0106] In this way, the SBFD symbols are used for offloading the random access channel, and therefore, by offloading some of the UL random access channel to the SBFD symbols, the UL coverage can also be improved.

[0107] As described above, in this embodiment, the determination of time domain resources for Msg 3 PUSCH transmission and Msg 4 HARQ ACK PUCCH transmission will be described depending on whether PRACH transmission is performed using SBFD symbols or non-SBFD symbols.

[0108] In the following, Proposal 1 and Proposal 2 for Msg 3 PUSCH transmission will be described, and Proposal 3 and Proposal 4 for Msg 4 PUCCH transmission will be described.

[0109] Two proposals for Msg 3 PUSCH transmission are as follows: Proposal 1: PRACH transmission with a valid RO in the SBFD symbol indicates UE notification of Msg 3 PUSCH transmission in the SBFD symbol, which may be an SBFD DL symbol and / or an SBFD FL symbol. Proposal 2: PRACH transmission with a valid RO in the SBFD symbol indicates UE capability / request of Msg 3 PUSCH transmission in the SBFD symbol, which may be an SBFD DL symbol and / or an SBFD FL symbol.

[0110] Two proposals for Msg4 HARQ-ACK PUCCH transmission are as follows: Proposal 3: PRACH transmission on a valid RO in an SBFD symbol indicates UE notification of Msg4 HARQ-ACK PUCCH transmission in the SBFD symbol, which may be an SBFD DL symbol and / or an SBFD FL symbol. Proposal 4: PRACH transmission on a valid RO in an SBFD symbol indicates UE capability / request of Msg4 HARQ-ACK PUCCH transmission in the SBFD symbol, which may be an SBFD DL symbol and / or an SBFD FL symbol.

[0111] In this embodiment, the SBFD DL symbol and / or SBFD FL symbol is one of the following options: Option 1: SBFD DL symbol only Option 2: SBFD DL symbol and SBFD FL symbol Option 3: SBFD FL symbol only

[0112] Here, "notification" in Proposal 1 means that the UE can use the Msg 3 PUSCH function in the SBFD symbol as long as the PRACH is transmitted in the SBFD symbol. "Notification" in Proposal 3 means that the UE can use the Msg 4 HARQ-ACK PUCCH function in the SBFD symbol as long as the PRACH is transmitted in the SBFD symbol.

[0113] Here, "capability / requirement" in Proposal 2 means that whether the UE uses the Msg 3 PUSCH function in the SBFD symbol requires further instruction from the gNB. "capability / requirement" in Proposal 4 means that whether the UE uses the Msg 4 HARQ-ACK PUCCH function in the SBFD symbol requires further instruction from the gNB.

[0114] In Proposal 2, if the UE determines that Msg 3 PUSCH transmission does not need to be performed within an SBFD symbol, the UE does not need to perform PRACH transmission with a valid RO in the SBFD symbol. For example, in this case, the UE may perform PRACH transmission with a valid RO in a non-SBFD symbol. In Proposal 4, as in Proposal 2, if the UE determines that Msg 4 HARQ-ACK PUCCH transmission does not need to be performed within an SBFD symbol, the UE does not need to perform PRACH transmission with a valid RO in the SBFD symbol.

[0115] In Proposals 2 and 4, compared to Proposals 1 and 3, the amount of offloading to SBFD symbols is left to the gNB's decision and is within the gNB's control.

[0116] Each proposal will be explained below.

[0117] <Proposal 1> PRACH transmission in a valid RO in an SBFD symbol indicates UE notification of Msg 3 PUSCH transmission in the SBFD symbol. Note that the SBFD symbol here may be an SBFD DL symbol and / or an SBFD FL symbol.

[0118] 16 is a diagram showing an example of Proposal 1. Note that Proposal 1 may have two cases depending on how the SBFD FL symbol is handled.

[0119] <Case 1> <Case 1 of Case 1> As shown in Case 1 of FIG. 16 , Case 1 of Case 1 is a case where the PRACH is transmitted using a valid RO in an SBFD symbol. Here, the SBFD symbol may be an SBFD DL symbol and / or an SBFD FL symbol. In Case 1 of Case 1, the UE may or can apply the capability of transmitting the Msg 3 PUSCH in the SBFD symbol for transmitting the Msg 3 PUSCH. In Case 1 of Case 1, the Msg 3 PUSCH transmission may be performed in the SBFD symbol (e.g., the SBFD DL symbol). Details will be described below in Proposal 1-1.

[0120] <Case 1, Case 2> As shown in Case 2 of Figure 16, Case 2 of Case 1 is a case where the PRACH is transmitted in a valid RO in a non-SBFD symbol. Here, the non-SBFD symbol may be a non-SBFD DL symbol and / or a non-SBFD FL symbol. In Case 1, Case 2, the UE does not apply the capability of transmitting Msg 3 PUSCH in SBFD symbols for Msg 3 PUSCH transmission. In Case 1, Case 2, the behavior of a legacy UE for Msg 3 PUSCH transmission is reused for the UE.

[0121] <Case 2> <Case 1 of Case 2> Case 1 of Case 2 is a case where the PRACH is transmitted with a valid RO in an SBFD DL symbol. In Case 1 of Case 2, the UE may or can apply the capability of transmitting the Msg 3 PUSCH in an SBFD symbol (e.g., an SBFD DL symbol) for transmitting the Msg 3 PUSCH. In Case 1 of Case 2, the Msg 3 PUSCH transmission may be performed in an SBFD symbol (e.g., an SBFD DL symbol). Details are described below in Proposal 1-1.

[0122] <Case 2 of Case 2> Case 2 of Case 2 is a case where the PRACH is transmitted in a non-SBFD symbol and / or a valid RO in an SBFD FL symbol. Here, the non-SBFD symbol may be a non-SBFD DL symbol and / or a non-SBFD FL symbol. In other words, Case 2 of Case 2 is a case where the PRACH is transmitted in a non-SBFD DL symbol, a non-SBFD FL symbol, or a valid RO in an SBFD FL symbol. In Case 2 of Case 2, the UE does not apply the capability of transmitting Msg 3 PUSCH in an SBFD symbol for Msg 3 PUSCH transmission. In Case 2 of Case 2, the legacy UE behavior for Msg 3 PUSCH transmission is reused for the UE.

[0123] As described above, in case 1, the SBFD FL symbol is included in case 1, and in case 2, the SBFD FL symbol is included in case 2. In either case, the present disclosure applies.

[0124] First, case 1 of case 1 and case 2, that is, the case where the PRACH is transmitted in a valid RO in an SBFD symbol or an SBFD DL symbol, will be described.

[0125] When the repetition factor indicated for Msg 3 PUSCH is 1, at least one of the following options 1-A to 1-C is applied to the time domain resources of Msg 3 PUSCH. Here, the repetition factor of 1 refers to the case where N ｒｅｐｅａｔ ＰＵＳＣＨ = 1.

[0126] Option 1-A: The UE only transmits Msg 3 PUSCH in SBFD symbols. In other words, the UE does not transmit Msg 3 PUSCH in symbols that are not SBFD symbols (e.g., non-SFBD symbols). Here, the SBFD symbols may be SBFD DL symbols and / or SBFD FL symbols. For Option 1-A, either Option 1-A1 or Option 1-A2 below is applied.

[0127] Option 1-A1 The UE assumes that the PUSCH symbol of slot n + k_2 + Δ (e.g., n + k_2 + Δ-th slot) is in the SBFD symbol. In this case, the gNB may set the PUSCH symbol of slot n + k_2 + Δ (e.g., n + k_2 + Δ-th slot) to the SBFD symbol.

[0128] Option 1-A2: If the PUSCH symbol of slot n+k_2+Δ (e.g., the n+k_2+Δ-th slot) is in a non-SBFD symbol, the UE postpones Msg 3 PUSCH to a slot in which the Msg 3 PUSCH symbol is an SBFD symbol. The UE determines the slot for Msg 3 PUSCH to be the first slot after slot n+k_2+Δ in which the PUSCH symbol is in an SBFD symbol.

[0129] Figure 17 is a diagram showing an example of Option 1-A. The horizontal axis of Figure 17 represents the time axis, and the vertical axis represents the frequency axis. Figure 17 shows an example in which the Msg 3 PUSCH symbol of P1 indicated by the RAR is a non-SBFD symbol.

[0130] In Option 1-A2, as shown in FIG. 17, if the Msg 3 PUSCH symbol of P1 indicated by the RAR is a non-SBFD symbol, the UE postpones the Msg 3 PUSCH to a slot where the Msg 3 PUSCH symbol is an SBFD symbol, for example, position P2 in FIG. 17.

[0131] In the case of the above Option 1-A1, it is not necessary to assume that the Msg 3 PUSCH symbol shown in P1 is a non-SBFD symbol.

[0132] Variation of Option 1-A: The UE does not assume that Msg 3 PUSCH overlaps with RBs outside the UL subband of the SBFD symbol.

[0133] Option 1-B: The UE may transmit Msg 3 PUSCH within an SBFD symbol or a non-SBFD symbol based on the indicated Time Domain Resource Allocation (TDRA) indication. In other words, the UE may transmit Msg 3 PUSCH within an SBFD symbol or a non-SBFD symbol in the PUSCH symbol of slot n+k_2+Δ (e.g., the n+k_2+Δ-th slot).

[0134] Explaining this with reference to FIG. 17, in Option 1-B, if the Msg 3 PUSCH symbol of P1 indicated by the RAR is a non-SBFD symbol, the UE may transmit Msg 3 PUSCH in P1, which is a non-SBFD symbol.

[0135] Option 1-C Option 1-C is a variation of the above Option 1-A. The UE only transmits Msg 3 PUSCH in SBFD DL symbols. In other words, the UE does not transmit Msg 3 PUSCH in symbols that are not SBFD DL symbols (e.g., non-SFBD symbols and / or SBFD FL symbols). For Option 1-C, either Option 1-C1 or Option 1-C2 below is applied.

[0136] Option 1-C1 The UE assumes that the PUSCH symbol of slot n + k_2 + Δ (e.g., n + k_2 + Δ-th slot) is in the SBFD DL symbol. In this case, the gNB may set the PUSCH symbol of slot n + k_2 + Δ (e.g., n + k_2 + Δ-th slot) to the SBFD DL symbol.

[0137] Option 1-C2: If the PUSCH symbol of slot n+k_2+Δ (e.g., the n+k_2+Δ-th slot) is within a non-SBFD DL symbol, a non-SBFD FL symbol, or an SBFD FL symbol, the UE postpones Msg 3 PUSCH to a slot in which the Msg 3 PUSCH symbol is within an SBFD DL symbol. The UE determines the slot for Msg 3 PUSCH to be the first slot after slot n+k_2+Δ in which the PUSCH symbol is within an SBFD DL symbol. Note that non-SBFD FL symbols and SBFD FL symbols may be collectively referred to as FL symbols.

[0138] Variation of Option 1-C: The UE does not assume that the Msg3 PUSCH overlaps with RBs outside the UL subband of the SBFD DL symbol.

[0139] The above Option 1-A and Option 1-C differ in how the SBFD FL symbol is handled. Option 1-A corresponds to Case 1 of the above Case 1, and Option 1-C may correspond to Case 1 of the above Case 2. Note that in the following proposals and options of each proposal, in examples where different operations are performed for SBFD symbols and non-SBFD symbols, "SBFD symbol" may be replaced with "SBFD DL symbol" and "non-SBFD symbol" may be replaced with "non-SBFD symbol and / or SBFD DL symbol" as appropriate.

[0140] For example, the SBFD symbols include the SBFD DL symbol and the SBFD FL symbol. For legacy UEs, the symbols available for Msg 3 PUSCH transmission are the UL symbol or the FL symbol. Therefore, if orthogonal UL resources are required for legacy UEs and SBFD-aware UEs for offloading purposes, offloading may only occur within the SBFD DL symbol. That is, the SBFD FL symbol may be considered the same as the FL symbol according to the legacy rules. In relation to these legacy rules, in Case 1 of Case 2 and Option 1-C for Case 1 of Case 2, the UE only transmits Msg 3 PUSCH in the SBFD DL symbol.

[0141] If the repetition factor indicated for Msg 3 PUSCH is greater than 1, at least one of the following options 2-A to 2-E is applied to the time domain resources (e.g., slots) for repetition of Msg 3 PUSCH. Here, the repetition factor greater than 1 refers to N ｒｅｐｅａｔ ＰＵＳＣＨ For example, in the following, N ｒｅｐｅａｔ ＰＵＳＣＨ N if >1 ｒｅｐｅａｔ ＰＵＳＣＨ Options are shown for determining the number of slots (e.g., slots for Msg 3 PUSCH repetition).

[0142] Option 2-A: Repetition of Msg 3 PUSCH is performed only in SBFD symbols. In other words, repetition of Msg 3 PUSCH is not performed even once in non-SBFD symbols. ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots starting from slot n+k_2+Δ (e.g., the n+k_2+Δ-th slot) in which the repetition of PUSCH transmission is within the SBFD symbol. ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0143] - Variation of Option 2-A The UE does not assume that the Msg3 PUSCH overlaps with RBs outside the UL subband of the SBFD symbol.

[0144] Option 2-B In Option 2-B, repetition of Msg 3 PUSCH is performed within SBFD symbols and / or non-SBFD symbols. In other words, in Option 2-B, the symbols in which Msg 3 PUSCH repetition is performed may include a mixture of SBFD symbols and non-SBFD symbols.

[0145] The UE ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots are taken as starting from slot n+k_2+Δ (e.g., the n+k_2+Δ-th slot) and the repetition of Msg 3 PUSCH does not overlap with any non-SBFD DL symbol or (non-SBFD) SSB symbol. ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0146] Alternatively, the UE may ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots starting from slot n+k_2+Δ in which the repetition of Msg 3 PUSCH does not overlap with the SBFD symbol and the non-SBFD symbol are ｒｅｐｅａｔ ＰＵＳＣＨ The number of slots may be determined.

[0147] Alternatively, the UE may ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots starting from slot n+k_2+Δ in which the repetition of Msg 3 PUSCH does not overlap with RBs outside the UL subband of the SBFD symbol. ｒｅｐｅａｔ ＰＵＳＣＨ The number of slots may be determined.

[0148] In addition, the UE is N ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots are defined as slots n+k_2+Δ, starting from slot n+k_2+Δ, in which the repetition of Msg 3 PUSCH does not overlap with any non-SBFD DL symbols or (non-SBFD) SSB symbols, and / or does not overlap with SBFD symbols and non-SBFD symbols simultaneously, and / or does not overlap with RBs outside the UL subband of the SBFD symbols. ｒｅｐｅａｔ ＰＵＳＣＨ The number of slots may be determined.

[0149] Option 2-C: Repetition of Msg 3 PUSCH is performed only in SBFD symbols or only in non-SBFD symbols. In other words, in Option 2-C, the symbols in which Msg 3 PUSCH repetition is performed do not include a mixture of SBFD symbols and non-SBFD symbols. Two examples of Option 2-C will be described.

[0150] Example 1 of Option 2-C In Example 1, the UE determines the symbol type based on the first slot determined for the repetition of Msg 3 PUSCH.

[0151] As an exemplary method for determining the first slot, the first slot of the repetition of Msg 3 PUSCH starts from slot n+k_2+Δ, which is the first slot in which the repetition of Msg 3 PUSCH does not overlap with any non-SBFD DL symbol or (non-SBFD) SSB symbol.

[0152] Alternatively, as a method of determining the first slot, the first slot of the repetition of Msg 3 PUSCH may start from slot n+k_2+Δ, and may be the first slot in which the repetition of Msg 3 PUSCH does not overlap with the SBFD symbol and non-SBFD symbol simultaneously.

[0153] Alternatively, as a method of determining the first slot, the first slot of the repetition of Msg 3 PUSCH may start from slot n+k_2+Δ, and may be the first slot in which the repetition of Msg 3 PUSCH does not overlap with an RB outside the UL subband of the SBFD symbol.

[0154] Alternatively, as a method of determining the first slot, the first slot of the repetition of Msg 3 PUSCH may start from slot n+k_2+Δ and may be the first slot in which the repetition of Msg3 PUSCH does not overlap with any non-SBFD DL symbol or (non-SBFD) SSB symbol, and / or does not overlap simultaneously with SBFD symbols and non-SBFD symbols, and / or does not overlap with RBs outside the UL subband of the SBFD symbol.

[0155] In Example 1 of Option 2-C, if the Msg 3 PUSCH symbol in the first slot is an SBFD symbol, the UE ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots in which the repetition of PUSCH transmission is within the SBFD symbol ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0156] In Example 1 of Option 2-C, if the Msg 3 PUSCH symbol in the first slot is a non-SBFD symbol, the UE ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots in which the repetition of PUSCH transmission does not overlap with any DL / SSB symbol or any SBFD symbol are ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0157] Example 2 of Option 2-C In Example 2, the UE determines the symbol type based on the RAR instruction or the gNB configuration / instruction. Note that the symbol type here may be, for example, an SBFD symbol type or a non-SBFD symbol type.

[0158] In Example 2 of Option 2-C, if the type of the indicated / configured symbol is SBFD type, the UE ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots in which the repetition of PUSCH transmission is within the SBFD symbol ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0159] In Example 2 of Option 2-C, if the type of the indicated / configured symbol is a non-SBFD type, the UE ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots in which the repetition of PUSCH transmission does not overlap with any DL / SSB symbol or any SBFD symbol are ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0160] Here, Option 2-A to Option 2-C will be explained using the drawings.

[0161] Fig. 18 is a diagram showing a first example of repetition of PUSCH transmission. Fig. 19 is a diagram showing a second example of repetition of PUSCH transmission. Fig. 20 is a diagram showing a third example of repetition of PUSCH transmission. In Figs. 18 to 20, the horizontal axis represents the time axis, and the vertical axis represents the frequency axis. Figs. 18 to 20 show an example in which four repetitions (denoted as Msg 3 rep #1 to Msg 3 rep #4 in the figures) are performed.

[0162] In the case of Option 2-A, repetition of Msg 3 PUSCH is performed only in SBFD symbols, and therefore, as shown in FIG. 18, repetition of Msg 3 PUSCH is performed in SBFD symbols, and repetition of Msg 3 PUSCH is not performed in non-SBFD symbols.

[0163] In the case of Option 2-B, repetition of Msg 3 PUSCH is performed within SBFD symbols and / or non-SBFD symbols, and therefore, as shown in FIG. 19, repetition of Msg 3 PUSCH is performed in SBFD symbols and non-SBFD symbols.

[0164] In the case of Option 2-C, repetition of Msg 3 PUSCH is performed only in SBFD symbols or only in non-SBFD symbols. For example, when repetition of Msg 3 PUSCH is performed only in SBFD symbols, as shown in Figure 18, repetition of Msg 3 PUSCH is performed in SBFD symbols, and repetition of Msg 3 PUSCH is not performed in non-SBFD symbols. For example, when repetition of Msg 3 PUSCH is performed only in non-SBFD symbols, as shown in Figure 20, repetition of Msg 3 PUSCH is performed in non-SBFD symbols, and repetition of Msg 3 PUSCH is not performed in SBFD symbols.

[0165] Option 2-D Option 2-D is one of the variations of Option 2-A. In Option 2-D, Msg 3 PUSCH repetition is performed only in SBFD DL symbols. In other words, Msg 3 PUSCH repetition is not performed even once in non-SBFD symbols and SBFD FL symbols. The UE ｒｅｐｅａｔ ＰＵＳＣＨThe first N slots starting from slot n+k_2+Δ (e.g., the n+k_2+Δ-th slot) where the repetition of PUSCH transmission is within the SBFD DL symbol. ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0166] Option 2-D Variation: The UE does not assume that the Msg3 PUSCH overlaps with RBs outside the UL subband of the SBFD DL symbol.

[0167] Option 2-E Option 2-E is a variation of Option 2-C. In Option 2-E, repetition of Msg 3 PUSCH is performed only in SBFD DL symbols, or only in non-SBFD DL symbols / non-SBFD FL symbols / SBFD FL symbols. Two examples of Option 2-E are described below.

[0168] Example 1 of Option 2-E In Example 1 of Option 2-E, the UE determines the symbol type based on the first slot determined for the repetition of Msg 3 PUSCH.

[0169] As an exemplary method for determining the first slot, the first slot of the repetition of Msg 3 PUSCH starts from slot n+k_2+Δ, which is the first slot in which the repetition of Msg 3 PUSCH does not overlap with any non-SBFD DL symbol or (non-SBFD) SSB symbol.

[0170] Alternatively, as a method of determining the first slot, the first slot of the repetition of Msg 3 PUSCH may start from slot n+k_2+Δ, and may be the first slot in which the repetition of Msg 3 PUSCH does not overlap with the SBFD symbol and non-SBFD symbol simultaneously.

[0171] Alternatively, as a method of determining the first slot, the first slot of the repetition of Msg 3 PUSCH may start from slot n+k_2+Δ, and may be the first slot in which the repetition of Msg 3 PUSCH does not overlap with an RB outside the UL subband of the SBFD symbol.

[0172] Alternatively, as a method of determining the first slot, the first slot of the repetition of Msg 3 PUSCH may start from slot n+k_2+Δ and may be the first slot in which the repetition of Msg 3 PUSCH does not overlap with any non-SBFD DL symbol or (non-SBFD) SSB symbol, and / or does not overlap simultaneously with SBFD symbols and non-SBFD symbols, and / or does not overlap with RBs outside the UL subband of the SBFD symbol.

[0173] In Example 1 of Option 2-E, if the Msg 3 PUSCH symbol in the first slot is an SBFD DL symbol, the UE ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots in which the repetition of PUSCH transmission is within the SBFD DL symbol ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0174] In Example 1 of Option 2-E, if the Msg 3 PUSCH symbol in the first slot is a non-SBFD DL symbol / non-SBFD FL symbol / SBFD FL symbol, the UE shall ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots in which the repetition of PUSCH transmission does not overlap with any DL / SSB symbol are ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0175] Alternatively, in Example 1 of Option 2-E, if the Msg 3 PUSCH symbol in the first slot is a non-SBFD DL symbol / non-SBFD FL symbol / SBFD FL symbol, the UE ｒｅｐｅａｔ ＰＵＳＣＨThe first N slots in which the repetition of PUSCH transmission does not overlap with SBFD symbols and non-SBFD symbols are ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0176] Example 2 of Option 2-E In Example 2, the UE determines the symbol type based on the RAR instruction or the gNB configuration / instruction. Note that the symbol type here may be, for example, an SBFD symbol type or a non-SBFD symbol type.

[0177] In Example 2 of Option 2-E, if the type of the indicated / configured symbol is SBFD type, the UE ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots in which the repetition of PUSCH transmission is within the SBFD DL symbol ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0178] In Example 2 of Option 2-E, if the type of the indicated / configured symbol is a non-SBFD type, the UE ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots in which the repetition of PUSCH transmission does not overlap with any DL / SSB symbol are ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0179] Alternatively, in Example 2 of Option 2-E, if the type of the indicated / configured symbol is a non-SBFD type, the UE ｒｅｐｅａｔ ＰＵＳＣＨ The first N slots in which the repetition of PUSCH transmission does not overlap with SBFD symbols and non-SBFD symbols are ｒｅｐｅａｔ ＰＵＳＣＨ The slots are determined.

[0180] In Proposal 1 described above, the UE performs PRACH transmission and determines the resource for Msg 3 PUSCH transmission depending on the type of resource for PRACH transmission. The PRACH transmission corresponds to the transmission of a random access preamble. The resource types may be the above-mentioned SBFD symbols and non-SBFD symbols. Alternatively, the resource types may be two types: SBFD DL symbols, non-SBFD symbols, and SBFD FL symbols. The SBFD symbols may correspond to a type of symbol that can utilize subbands with different transmission and reception directions within a time division duplex (TDD) band. The Msg 3 PUSCH is an example of a signal related to random access after the random access preamble.

[0181] In addition, in Proposal 1, the gNB receives a PRACH (e.g., a preamble) from a UE and recognizes the capabilities of the source UE (e.g., whether Msg 3 PUSCH can be transmitted in an SBFD symbol) based on the type of resource on which the PRACH is received. Then, based on the recognized capabilities of the UE, the gNB determines the resources on which the UE will transmit Msg 3 PUSCH.

[0182] According to Proposal 1, the UE capability for Msg 3 PUSCH transmission in the SBFD symbol is indicated by the PRACH transmission in the SBFD symbol, which reduces the increase in preamble resources. This also allows random access to be performed appropriately, reduces random access delays, and increases the number of UEs that can perform random access. This also improves UL coverage by offloading part of the UL random access channel to the SBFD symbol.

[0183] <Proposal 2> PRACH transmission with a valid RO in an SBFD symbol indicates UE capability / request for Msg3 PUSCH transmission in the SBFD symbol, which may be an SBFD DL symbol and / or an SBFD FL symbol.

[0184] The difference between Proposal 1 and Proposal 2 is that "notification" in Proposal 1 means that the UE can use the Msg 3 PUSCH function in the SBFD symbol without gNB confirmation (e.g., instruction from the gNB), while "capability / request" in Proposal 2 means that the UE needs gNB confirmation to use the Msg 3 PUSCH function in the SBFD symbol.

[0185] In Proposal 2, whether Msg 3 PUSCH transmission is performed in SBFD / non-SBFD symbols or whether Msg 3 PUSCH transmission is possible in SBFD / non-SBFD symbols depends on an instruction from the gNB. In other words, when a UE performs PRACH transmission in a valid RO in an SBFD symbol, the UE performs Msg 3 PUSCH transmission based on an instruction as to whether Msg 3 PUSCH transmission is performed in SBFD / non-SBFD symbols. Two examples, example a and example b, will be described below.

[0186] Example a: Whether Msg 3 PUSCH transmission is performed in an SBFD symbol is implicitly indicated by the symbol type of the detected RAR that schedules the Msg 3 PUSCH transmission. Note that the SBFD symbol here may be an SBFD DL symbol and / or an SBFD FL symbol. If the UE detects an RAR in an SBFD symbol, the UE is instructed to transmit Msg 3 PUSCH in the SBFD symbol. If the UE detects an RAR in a non-SBFD DL symbol or a non-SBFD FL symbol, the UE is instructed to transmit non-Msg 3 PUSCH in the SBFD symbol. In other words, in this case, the UE is instructed not to transmit Msg 3 PUSCH in the SBFD symbol.

[0187] Whether Msg 3 PUSCH transmission is performed in SBFD symbols may be implicitly indicated by the symbol type of DCI format 0_0 that schedules Msg 3 PUSCH transmission and includes a CRC scrambled by the TC-RNTI. If the UE detects DCI format 0_0 that includes a CRC scrambled by the TC-RNTI in an SBFD symbol, the UE is instructed to transmit Msg 3 PUSCH in SBFD symbols. If the UE detects DCI format 0_0 that includes a CRC scrambled by the TC-RNTI in a non-SBFD DL symbol or a non-SBFD FL symbol, the UE is instructed to transmit non-Msg3 PUSCH in SBFD symbols. In other words, in this case, the UE is instructed not to transmit Msg3 PUSCH in SBFD symbols.

[0188] Note that, in the above Example a, an example was shown in which there are two symbol types, SBFD symbols and non-SBFD symbols, but the present disclosure is not limited to this. For example, similar to Case 2 of Proposal 1, the symbol types may be divided into two, SBFD DL symbols and non-SBFD symbols and SBFD FL symbols.

[0189] In a case where the symbol types are divided into SBFD DL symbols and non-SBFD symbols and SBFD FL symbols, as a variation of example a, if the UE detects an RAR in an SBFD DL symbol, the UE is instructed to transmit Msg 3 PUSCH in the SBFD DL symbol.If the UE detects an RAR in a non-SBFD DL symbol, a non-SBFD FL symbol, or an SBFD FL symbol, the UE is instructed to transmit non-Msg 3 PUSCH in the SBFD DL symbol.In other words, in this case, the UE is instructed not to transmit Msg 3 PUSCH in the SBFD DL symbol.

[0190] Example b: Whether Msg 3 PUSCH transmission is performed in an SBFD symbol is explicitly indicated by a new field in the RAR.

[0191] For example, based on the above example a or example b, if the UE is instructed to transmit the Msg3 PUSCH in the SBFD symbol, the UE may (or may apply) the capability of transmitting the Msg3 PUSCH in the SBFD symbol for the Msg3 PUSCH transmission. Then, if the Msg3 PUSCH transmission is performed in the SBFD symbol (e.g., the SBFD DL symbol), the UE behavior described in Proposal 1-1 above may be used.

[0192] For example, based on the above example a or example b, if the UE is instructed to transmit non-Msg 3 PUSCH in SBFD symbols, the UE does not apply the capability of transmitting Msg 3 PUSCH in SBFD symbols for Msg 3 PUSCH transmission, and the behavior of legacy UEs for Msg 3 PUSCH transmission is reused.

[0193] FIG. 21 is a diagram showing an example of Proposal 2. Case 1 in FIG. 21 is a case where PRACH is transmitted using a valid RO in an SBFD symbol. In Proposal 2, as shown in FIG. 21, in Case 1, if the gNB instructs that Msg 3 PUSCH transmission be performed using an SBFD symbol, Msg 3 PUSCH transmission may be performed using an SBFD symbol. On the other hand, in Proposal 2, as shown in FIG. 21, in Case 1, if the gNB instructs that Msg 3 PUSCH transmission be performed using a non-SBFD symbol (or instructs that Msg 3 PUSCH transmission not be performed using an SBFD symbol), Msg 3 PUSCH transmission is not performed using an SBFD symbol. Note that, as shown in Case 2 in FIG. 21, when PRACH is transmitted using a valid RO in a non-SBFD symbol, Msg 3 PUSCH transmission is not performed using an SBFD symbol.

[0194] In Proposal 2 described above, the UE performs PRACH transmission and determines the resource on which to transmit Msg 3 PUSCH based on an instruction from the gNB according to the type of resource on which the PRACH transmission was performed. The PRACH transmission corresponds to the transmission of a random access preamble. The resource types may be the above-mentioned SBFD symbols and non-SBFD symbols. Alternatively, the resource types may be two types: SBFD DL symbols, non-SBFD symbols, and SBFD FL symbols. The SBFD symbols may correspond to a type of symbol that can utilize subbands with different transmission and reception directions within a time division duplex (TDD) band. The Msg 3 PUSCH is an example of a signal related to random access after the random access preamble.

[0195] In addition, in Proposal 2, the gNB receives a PRACH (e.g., a preamble) from a UE and recognizes the capabilities of the source UE (e.g., whether Msg 3 PUSCH can be transmitted in an SBFD symbol) based on the type of resource on which the PRACH is received. Then, based on the recognized capabilities of the UE, the gNB determines the resources on which the UE will transmit the Msg 3 PUSCH and indicates the determined resources.

[0196] According to Proposal 2, the UE capability for Msg 3 PUSCH transmission in the SBFD symbol is indicated by the PRACH transmission in the SBFD symbol, which reduces the increase in preamble resources. This also allows random access to be performed appropriately, reduces random access delays, and increases the number of UEs that can perform random access. This also improves UL coverage by offloading part of the UL random access channel to the SBFD symbol.

[0197] <Proposal 3> PRACH transmission with a valid RO in an SBFD symbol indicates UE notification of Msg 4 HARQ-ACK PUCCH transmission in the SBFD symbol. Note that the SBFD symbol here may be an SBFD DL symbol and / or an SBFD FL symbol.

[0198] In Proposal 3, there may be two cases depending on how the SBFD FL symbol is handled.

[0199] <Case 1> <Case 1 of Case 1> Case 1 of Case 1 is a case where the PRACH is transmitted with a valid RO in an SBFD symbol. Here, the SBFD symbol may be an SBFD DL symbol and / or an SBFD FL symbol. In Case 1 of Case 1, the UE may or can apply the capability of transmitting the Msg 4 HARQ-ACK PUCCH in an SBFD symbol for transmitting the Msg 4 HARQ-ACK PUCCH. In Case 1 of Case 1, the Msg 4 HARQ-ACK PUCCH transmission may be performed in an SBFD symbol (e.g., an SBFD DL symbol). Details are described below in Proposal 3-1.

[0200] <Case 1, Case 2> Case 2 of Case 1 is a case where the PRACH is transmitted with a valid RO in a non-SBFD symbol. The non-SBFD symbol here may be a non-SBFD DL symbol and / or a non-SBFD FL symbol. In Case 1, Case 2, the UE does not apply the capability of transmitting Msg 4 HARQ-ACK PUCCH in SBFD symbols for Msg 4 HARQ-ACK PUCCH transmission. In Case 1, Case 2, the legacy UE behavior of transmitting Msg 4 HARQ-ACK PUCCH is reused for the UE.

[0201] <Case 2> <Case 1 of Case 2> Case 1 of Case 2 is a case where the PRACH is transmitted in a valid RO in an SBFD DL symbol. In Case 1 of Case 2, the UE may or can apply the capability of transmitting the Msg 4 HARQ-ACK PUCCH in an SBFD symbol (e.g., an SBFD DL symbol) for transmitting the Msg 4 HARQ-ACK PUCCH. In Case 1 of Case 2, the Msg 4 HARQ-ACK PUCCH is transmitted in an SBFD symbol (e.g., an SBFD DL symbol). Details are described below in Proposal 3-1.

[0202] <Case 2 of Case 2> Case 2 of Case 2 is a case where the PRACH is transmitted in a non-SBFD symbol and / or a valid RO in an SBFD FL symbol. The non-SBFD symbol here may be a non-SBFD DL symbol and / or a non-SBFD FL symbol. In other words, Case 2 of Case 2 is a case where the PRACH is transmitted in a non-SBFD DL symbol, a non-SBFD FL symbol, or a valid RO in an SBFD FL symbol. In Case 2 of Case 2, the UE does not apply the capability of transmitting Msg 4 HARQ-ACK PUCCH in an SBFD symbol for Msg 4 HARQ-ACK PUCCH transmission. In Case 2 of Case 2, the legacy UE behavior of transmitting Msg 4 HARQ-ACK PUCCH is reused for the UE.

[0203] As described above, in case 1, the SBFD FL symbol is included in case 1, and in case 2, the SBFD FL symbol is included in case 2. In either case, the present disclosure applies.

[0204] First, case 1 of case 1 and case 2, that is, the case where the PRACH is transmitted in a valid RO in an SBFD symbol or an SBFD DL symbol, will be described.

[0205] When the repetition factor indicated for Msg 4 HARQ-ACK PUCCH is 1, at least one of the following options 1-A to 1-C is applied to the time domain resources of Msg 4 HARQ-ACK PUCCH. Here, the repetition factor of 1 refers to N ｒｅｐｅａｔ ＰＵＣＣＨ = 1.

[0206] Option 1-A: The UE only transmits Msg 4 HARQ-ACK PUCCH in SBFD symbols. In other words, the UE does not transmit Msg 4 HARQ-ACK PUCCH in symbols that are not SBFD symbols (e.g., non-SFBD symbols). Here, the SBFD symbols may be SBFD DL symbols and / or SBFD FL symbols. For Option 1-A, either Option 1-A1 or Option 1-A2 below is applied.

[0207] Option 1-A1: The UE assumes that the PUCCH symbol of the indicated HARQ-ACK reporting slot is in the SBFD symbol. In this case, the gNB may set the PUCCH symbol of the HARQ-ACK reporting slot to the SBFD symbol.

[0208] Option 1-A2: If the PUCCH symbol of the HARQ-ACK reporting slot is in a non-SBFD symbol, the UE postpones the PUCCH to a slot in which the PUCCH symbol is in an SBFD symbol. The UE transmits Msg 4 HARQ-ACK PUCCH in the first slot after the indicated HARQ-ACK reporting slot in which the PUCCH symbol is in an SBFD symbol.

[0209] Option 1-A Variation The UE does not assume that the Msg 4 HARQ-ACK PUCCH overlaps with RBs outside the UL subband of the SBFD symbol.

[0210] Option 1-B: The UE may transmit Msg 4 HARQ-ACK PUCCH in an SBFD symbol or a non-SBFD symbol based on the determined PUCCH resource in the indicated HARQ-ACK reporting slot.

[0211] Option 1-C Option 1-C is a variation of the above Option 1-A. The UE only transmits Msg 4 HARQ-ACK PUCCH in SBFD DL symbols. In other words, the UE does not transmit Msg 4 HARQ-ACK PUCCH in symbols that are not SBFD DL symbols (e.g., non-SFBD symbols and / or SBFD FL symbols). For Option 1-C, either Option 1-C1 or Option 1-C2 below is applied.

[0212] Option 1-C1: The UE assumes that the PUCCH symbol of the indicated HARQ-ACK reporting slot is in the SBFD DL symbol. In this case, the gNB may set the PUCCH symbol of the HARQ-ACK reporting slot to the SBFD DL symbol.

[0213] Option 1-C2: If the PUCCH symbol of the HARQ-ACK report slot is a non-SBFD DL symbol, a non-SBFD FL symbol, or an SBFD FL symbol, the UE postpones the PUCCH to a slot in which the PUCCH symbol is an SBFD DL symbol. The UE transmits Msg 4 HARQ-ACK PUCCH in the first slot after the indicated HARQ-ACK report slot in which the PUCCH symbol is within an SBFD DL symbol. Note that non-SBFD FL symbols and SBFD FL symbols may be collectively referred to as FL symbols.

[0214] Variation of Option 1-C: The UE does not assume that the Msg 4 HARQ-ACK PUCCH overlaps with RBs outside the UL subband of the SBFD DL symbol.

[0215] The above Option 1-A and Option 1-C differ in how the SBFD FL symbol is handled. Option 1-A corresponds to Case 1 of the above Case 1, and Option 1-C may correspond to Case 1 of the above Case 2.

[0216] For example, SBFD symbols include SBFD DL symbols and SBFD FL symbols. For legacy UEs, the symbols available for Msg 4 HARQ-ACK PUCCH transmission are UL symbols or FL symbols. Therefore, if orthogonal UL resources are required for legacy UEs and SBFD-aware UEs for offloading purposes, offloading may only occur within SBFD DL symbols. That is, SBFD FL symbols may be considered the same as FL symbols according to legacy rules. In consideration of these legacy rules, in Option 1-C, the UE only transmits Msg 4 HARQ-ACK PUCCH in SBFD DL symbols.

[0217] When the repetition factor for Msg 4 HARQ-ACK PUCCH is greater than 1, at least one of the following options 2-A to 2-E is applied to the time domain resources (e.g., slots) for repetition of Msg 4 HARQ-ACK PUCCH. Here, the repetition factor greater than 1 means that ｒｅｐｅａｔ ＰＵＣＣＨ For example, in the following, N ｒｅｐｅａｔ ＰＵＣＣＨ N if >1 ｒｅｐｅａｔ ＰＵＣＣＨ Options are shown for determining the number of slots (e.g., slots for Msg 4 HARQ-ACK PUCCH repetition).

[0218] Option 2-A: Repetition of Msg 4 HARQ-ACK PUCCH is performed only in SBFD symbols. In other words, repetition of Msg 4 HARQ-ACK PUCCH is not performed even once in non-SBFD symbols.ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the repetition of PUCCH transmission is within the SBFD symbol ｒｅｐｅａｔ ＰＵＣＣＨ The slots are determined.

[0219] Option 2-A Variation The UE does not assume that the Msg 4 HARQ-ACK PUCCH overlaps with RBs outside the UL subband of the SBFD symbol.

[0220] Option 2-B In Option 2-B, repetition of Msg 4 HARQ-ACK PUCCH is performed within SBFD symbols and / or non-SBFD symbols. In other words, in Option 2-B, the symbols in which repetition of Msg 4 HARQ-ACK PUCCH is performed may be a mixture of SBFD symbols and non-SBFD symbols.

[0221] The UE determines the N ｒｅｐｅａｔ ＰＵＣＣＨ slots, starting from the indicated HARQ-ACK reporting slot, with the first N ｒｅｐｅａｔ ＰＵＣＣＨ The first symbol is a UL symbol, or (non-SBFD) an FL symbol that is not an SSB symbol, or an SBFD DL symbol. Starting from the first symbol, a sequence of UL symbols, or (non-SBFD) an FL symbol that is not an SSB symbol, or an SBFD DL (or SSB) symbol for the number of consecutive symbols given by nrofsymbols.

[0222] Alternatively, the UE may select N ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots, starting from the indicated HARQ-ACK report slot, that satisfy at least one of the following conditions: ｒｅｐｅａｔ ＰＵＣＣＨ・When the PUCCH in a slot overlaps with an SBFD symbol, the PUCCH RB does not overlap with RBs outside the UL subband of the SBFD symbol. ・The PUCCH does not overlap with both the SBFD symbol and the non-SBFD symbol at the same time.

[0223] Alternatively, the UE may select N ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots, starting from the indicated HARQ-ACK report slot, that satisfy at least one of the following conditions: ｒｅｐｅａｔ ＰＵＣＣＨ The slot is determined as follows: - The slot has as its first symbol an FL symbol that is not a UL symbol or a (non-SBFD) SSB symbol, or an SBFD DL symbol. - The slot starts from the first symbol and has consecutive UL symbols or FL symbols that are not (non-SBFD) SSB symbols, or SBFD DL (or SSB) symbols for the number of symbols specified by nrofsymbols. - When a PUCCH in a slot overlaps with an SBFD symbol, the PUCCH RBs do not overlap with RBs outside the UL subband of the SBFD symbol. - The PUCCH does not overlap with an SBFD symbol and a non-SBFD symbol at the same time.

[0224] Option 2-C: Repetition of Msg 4 HARQ-ACK PUCCH is performed only in SBFD symbols or only in non-SBFD symbols. In other words, in Option 2-C, the symbols in which Msg 4 HARQ-ACK PUCCH repetition is performed do not include a mixture of SBFD symbols and non-SBFD symbols. Two examples of Option 2-C will be described.

[0225] Example 1 of Option 2-C In example 1, the UE determines the symbol type based on the first slot determined for the repetition of Msg 4 HARQ-ACK PUCCH.

[0226] In Example 1 of Option 2-C, similar to the conditions in Option 2-B above, N for PUCCH transmission ｒｅｐｅａｔ ＰＵＣＣＨ Determine the first slot of the slots.

[0227] In Example 1 of Option 2-C, if the Msg 4 HARQ-ACK PUCCH symbol in the first slot is an SBFD symbol, the UE ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the repetition of PUCCH transmission is within the SBFD symbol ｒｅｐｅａｔ ＰＵＣＣＨ The slots are determined.

[0228] In Example 1 of Option 2-C, if the Msg 4 HARQ-ACK PUCCH symbol in the first slot is a non-SBFD symbol, the UE ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the repetition of PUCCH transmission does not overlap with any DL / SSB symbol or any SBFD symbol are ｒｅｐｅａｔ ＰＵＣＣＨ The slots are determined.

[0229] Example 2 of Option 2-C In Example 2, the UE determines the symbol type for scheduling Msg 4 PDSCH based on the indication in DCI format 1_0 with CRC scrambled by TC-RNTI or based on the configuration, where the symbol type may be, for example, SBFD symbol type or non-SBFD symbol type.

[0230] If the indicated / configured symbol type is SBFD type, the UE ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the repetition of PUCCH transmission is within the SBFD symbol ｒｅｐｅａｔ ＰＵＣＣＨ The slots are determined.

[0231] If the indicated / configured symbol type is a non-SBFD type, the UE ｒｅｐｅａｔＰＵＣＣＨ The first N slots in which the repetition of PUCCH transmission does not overlap with any DL / SSB symbol or any SBFD symbol are ｒｅｐｅａｔ ＰＵＣＣＨ The slots are determined.

[0232] Option 2-D Option 2-D is one of the variations of Option 2-A. In Option 2-D, repetition of Msg 4 HARQ-ACK PUCCH is performed only in SBFD DL symbols. In other words, repetition of Msg 4 HARQ-ACK PUCCH is not performed even once in non-SBFD symbols and SBFD FL symbols. The UE ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the PUCCH transmission repetition is within the SBFD DL symbol ｒｅｐｅａｔ ＰＵＣＣＨ The slots are determined.

[0233] Option 2-D Variation: The UE does not assume that Msg 4 HARQ-ACK PUCCH overlaps with RBs outside the UL subband of the SBFD DL symbol.

[0234] Option 2-E Option 2-E is a variation of Option 2-C. In Option 2-E, repetition of Msg 4 HARQ-ACK PUCCH is performed only in SBFD DL symbols, or only in non-SBFD DL symbols / non-SBFD FL symbols / SBFD FL symbols. Two examples of Option 2-E are described below.

[0235] Example 1 of Option 2-E In Example 1, the UE determines the symbol type based on the first slot determined for the repetition of Msg 4 HARQ-ACK PUCCH.

[0236] In Example 1 of Option 2-E, similar to the conditions in Option 2-B above, N for PUCCH transmission ｒｅｐｅａｔ ＰＵＣＣＨDetermine the first slot of the slots.

[0237] In Example 1 of Option 2-E, if the Msg 4 HARQ-ACK PUCCH symbol in the first slot is an SBFD DL symbol, the UE shall ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the PUCCH transmission repetition is within the SBFD DL symbol ｒｅｐｅａｔ ＰＵＣＣＨ The slots are determined.

[0238] In Example 1 of Option 2-E, if the Msg 4 HARQ-ACK PUCCH symbol in the first slot is a non-SBFD DL symbol / non-SBFD FL symbol / SBFD FL symbol, the UE shall ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the repetition of PUCCH transmission does not overlap with any DL / SSB symbol or any SBFD symbol are ｒｅｐｅａｔ ＰＵＣＣＨ Alternatively, in Example 1 of Option 2-E, if the Msg 4 HARQ-ACK PUCCH symbol in the first slot is a non-SBFD DL symbol / non-SBFD FL symbol / SBFD FL symbol, the UE determines N ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the repetition of PUCCH transmission does not overlap with SBFD symbols and non-SBFD symbols at the same time. ｒｅｐｅａｔ ＰＵＣＣＨ Alternatively, in Example 1 of Option 2-E, if the Msg 4 HARQ-ACK PUCCH symbol in the first slot is a non-SBFD DL symbol / non-SBFD FL symbol / SBFD FL symbol, the UE determines N ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the repetition of PUCCH transmission does not overlap with any DL / SSB symbol or any SBFD symbol, and / or the repetition of PUCCH transmission does not overlap with SBFD symbols and non-SBFD symbols at the same time.ｒｅｐｅａｔ ＰＵＣＣＨ Determined to slots

[0239] In Example 2 of Option 2-E, the UE determines the symbol type based on the indication in DCI format 1_0 with CRC scrambled by TC-RNTI for scheduling Msg 4 PDSCH or based on the configuration. Note that the symbol type here may be, for example, SBFD symbol type or non-SBFD symbol type.

[0240] In Example 2 of Option 2-E, if the type of the indicated / configured symbol is SBFD type, the UE ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the repetition of PUCCH transmission is within the SBFD symbol ｒｅｐｅａｔ ＰＵＣＣＨ The slots are determined.

[0241] In Example 2 of Option 2-E, if the type of the indicated / configured symbol is a non-SBFD type, the UE ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the repetition of PUCCH transmission does not overlap with any DL / SSB symbol or any SBFD symbol are ｒｅｐｅａｔ ＰＵＣＣＨ Alternatively, in Example 2 of Option 2-E, if the type of the indicated / configured symbol is a non-SBFD type, the UE determines N ｒｅｐｅａｔ ＰＵＣＣＨ The first N slots in which the repetition of PUCCH transmission does not overlap with SBFD symbols and non-SBFD symbols at the same time. ｒｅｐｅａｔ ＰＵＣＣＨ Alternatively, in Example 2 of Option 2-E, if the type of the indicated / configured symbol is a non-SBFD type, the UE determines N ｒｅｐｅａｔ ＰＵＣＣＨThe first N slots in which the repetition of PUCCH transmission does not overlap with any DL / SSB symbol or any SBFD symbol, and / or the repetition of PUCCH transmission does not overlap with SBFD symbols and non-SBFD symbols at the same time. ｒｅｐｅａｔ ＰＵＣＣＨ The slots are determined.

[0242] In Proposal 3 described above, the UE performs PRACH transmission and determines the resource for Msg 4 HARQ-ACK PUCCH transmission according to the type of resource used for PRACH transmission. Note that PRACH transmission corresponds to transmission of a random access preamble. The resource types may be the above-mentioned SBFD symbols and non-SBFD symbols. Alternatively, the resource types may be two types: SBFD DL symbols and non-SBFD symbols and SBFD FL symbols. The Msg 4 HARQ-ACK PUCCH is an example of a signal related to random access after the random access preamble.

[0243] In addition, in Proposal 3, the gNB receives a PRACH (e.g., a preamble) from a UE and recognizes the capabilities of the source UE (e.g., whether Msg 4 HARQ-ACK PUCCH can be transmitted in an SBFD symbol) based on the type of resource on which the PRACH is received. Then, based on the recognized capabilities of the UE, the gNB determines the resources on which the UE will transmit Msg 4 HARQ-ACK PUCCH.

[0244] According to Proposal 3, the UE capability for Msg 4 HARQ-ACK PUCCH transmission in the SBFD symbol is indicated by the PRACH transmission in the SBFD symbol, which reduces the increase in preamble resources. This also allows random access to be performed appropriately, reduces random access delays, and increases the number of UEs that can access randomly. This also improves UL coverage by offloading part of the UL random access channel to the SBFD symbol.

[0245] <Proposal 4> PRACH transmission with a valid RO in an SBFD symbol indicates UE capability / request for Msg 4 HARQ-ACK PUCCH transmission in the SBFD symbol, which may be an SBFD DL symbol and / or an SBFD FL symbol.

[0246] The difference between Proposal 3 and Proposal 4 is that "notification" in Proposal 3 means that the UE can use the Msg 4 HARQ-ACK PUCCH functionality in the SBFD symbol without gNB confirmation (e.g., instruction from the gNB), while "capability / request" in Proposal 4 means that the UE needs gNB confirmation to use the Msg 4 HARQ-ACK PUCCH functionality in the SBFD symbol.

[0247] In Proposal 4, whether Msg 4 HARQ-ACK PUCCH transmission is performed in SBFD / non-SBFD symbols or whether Msg 4 HARQ-ACK PUCCH transmission is possible in SBFD / non-SBFD symbols depends on an instruction from the gNB. In other words, when a UE performs PRACH transmission in a valid RO in an SBFD symbol, the UE performs Mg 4 HARQ-ACK PUCCH transmission based on an instruction as to whether Msg 4 HARQ-ACK PUCCH transmission is performed in SBFD / non-SBFD symbols. Two examples, example a and example b, will be described below.

[0248] Example a: Whether Msg 4 HARQ-ACK PUCCH transmission is performed in an SBFD symbol is implicitly indicated by the symbol type of the detected RAR that schedules Msg 3 PUSCH transmission. Note that the SBFD symbol here may be an SBFD DL symbol and / or an SBFD FL symbol. If the UE detects an RAR in an SBFD symbol, the UE is instructed to transmit Msg 4 HARQ-ACK PUCCH in an SBFD symbol. If the UE detects an RAR in a non-SBFD DL symbol or a non-SBFD FL symbol, the UE is instructed to transmit non-Msg 4 HARQ-ACK PUCCH in an SBFD symbol. In other words, in this case, the UE is instructed not to transmit Msg 4 HARQ-ACK PUCCH in an SBFD symbol.

[0249] Whether Msg 4 HARQ-ACK PUCCH transmission is performed in an SBFD symbol may be implicitly indicated by the symbol type of DCI format 0_0 including a CRC scrambled by the TC-RNTI that schedules Msg 3 PUSCH transmission. If the UE detects DCI format 0_0 including a CRC scrambled by the TC-RNTI in an SBFD symbol, the UE is instructed to transmit the Msg 4 HARQ-ACK PUCCH in an SBFD symbol. If the UE detects DCI format 0_0 including a CRC scrambled by the TC-RNTI in a non-SBFD DL symbol or a non-SBFD FL symbol, the UE is instructed to transmit a non-Msg 4 HARQ-ACK PUCCH in an SBFD symbol. In other words, in this case, the UE is instructed not to transmit the Msg 4 HARQ-ACK PUCCH in an SBFD symbol.

[0250] Whether Msg 4 HARQ-ACK PUCCH transmission is performed in SBFD symbols may be implicitly indicated by the symbol type of DCI format 1_0, which schedules Mg 4 PDSCH and includes a CRC scrambled by the TC-RNTI. If the UE detects DCI format 1_0 including a CRC scrambled by the TC-RNTI in an SBFD symbol, the UE is instructed to transmit Msg 4 HARQ-ACK PUCCH in SBFD symbols. If the UE detects DCI format 1_0 including a CRC scrambled by the TC-RNTI in a non-SBFD DL symbol or a non-SBFD FL symbol, the UE is instructed to transmit non-Msg 4 HARQ-ACK PUCCH in SBFD symbols. In other words, in this case, the UE is instructed not to transmit Msg 4 HARQ-ACK PUCCH in SBFD symbols.

[0251] Note that, in the above Example a, an example was shown in which there are two symbol types, SBFD symbols and non-SBFD symbols, but the present disclosure is not limited to this. For example, similar to Case 2 of Proposal 1, the symbol types may be divided into two, SBFD DL symbols and non-SBFD symbols and SBFD FL symbols.

[0252] When the symbol types are divided into SBFD DL symbols and non-SBFD symbols and SBFD FL symbols, as a variation of example a, if the UE detects an RAR in an SBFD DL symbol, the UE is instructed to transmit Msg 4 HARQ-ACK PUCCH in the SBFD DL symbol.If the UE detects an RAR in a non-SBFD DL symbol, a non-SBFD FL symbol, or an SBFD FL symbol, the UE is instructed to transmit non-Msg 4 HARQ-ACK PUCCH in the SBFD DL symbol.In other words, in this case, the UE is instructed not to transmit Msg 4 HARQ-ACK PUCCH in the SBFD DL symbol.

[0253] Example b: Whether Msg 4 HARQ-ACK PUCCH transmission is performed in an SBFD symbol is explicitly indicated by a new field in the RAR and / or a new field in DCI format 1_0 that includes a CRC scrambled by the TC-RNTI that schedules Msg 4 PDSCH.

[0254] For example, based on the above example a or b, if the UE is instructed to transmit the Msg 4 HARQ-ACK PUCCH in the SBFD symbol, the UE may (or may be able to) apply the capability of transmitting the Mg 4 HARQ-ACK PUCCH in the SBFD symbol for the Msg 4 HARQ-ACK PUCCH transmission, and if the Mg 4 HARQ-ACK PUCCH transmission is performed in the SBFD symbol (e.g., the SBFD DL symbol), the UE behavior described in Proposal 3-1 above may be used.

[0255] For example, based on the above example a or example b, if the UE is instructed to transmit non-Msg 4 HARQ-ACK PUCCH in SBFD symbols, the UE does not apply the capability of transmitting Msg 4 HARQ-ACK PUCCH in SBFD symbols for Msg 4 HARQ-ACK PUCCH transmission, and the behavior of legacy UEs for Msg 4 HARQ-ACK PUCCH transmission is reused.

[0256] In Proposal 4 described above, the UE performs PRACH transmission and determines the resource on which to transmit Msg 4 HARQ-ACK PUCCH based on an instruction from the gNB according to the type of resource on which the PRACH transmission was performed. Note that the PRACH transmission corresponds to the transmission of a random access preamble. The resource types may be the above-mentioned SBFD symbols and non-SBFD symbols. Alternatively, the resource types may be two types: SBFD DL symbols and non-SBFD symbols and SBFD FL symbols. The Msg 4 HARQ-ACK PUCCH is an example of a signal related to random access after the random access preamble.

[0257] In addition, in Proposal 4, the gNB receives a PRACH (e.g., a preamble) from a UE and recognizes the capabilities of the source UE (e.g., whether Msg 4 HARQ-ACK PUCCH can be transmitted in an SBFD symbol) based on the type of resource on which the PRACH was received. Then, based on the recognized capabilities of the UE, the gNB determines the resources on which the UE will transmit Msg 4 HARQ-ACK PUCCH and indicates the determined resources.

[0258] According to Proposal 4, the UE capability for Msg 4 HARQ-ACK PUCCH transmission in the SBFD symbol is indicated by the PRACH transmission in the SBFD symbol, which reduces the increase in preamble resources. This also allows random access to be performed appropriately, reduces random access delays, and increases the number of UEs that can access randomly. This also improves UL coverage by offloading part of the UL random access channel to the SBFD symbol.

[0259] <Variations> Note that the above proposals and / or options of the proposals may be combined as appropriate. For example, by combining Proposal 1 and Proposal 3, PRACH transmission in a valid RO in an SBFD symbol may indicate UE notification of Msg 3 PUSCH transmission and / or Msg 4 HARQ-ACK PUCCH transmission in the SBFD symbol. Furthermore, by combining Proposal 2 and Proposal 4, PRACH transmission in a valid RO in an SBFD symbol may indicate UE capability / request of Msg 3 PUSCH transmission and / or Msg 4 HARQ-ACK PUCCH transmission in the SBFD symbol.

[0260] Note that the above proposals may be applied to UEs in connected mode or to UEs in RRC idle mode.

[0261] It should be noted that the above proposals may be applied to either the CBRA or the CFRA.

[0262] Among the above proposals and options, different proposals and / or options may be applied to different RA types, different RACH triggering methods, different RACH purposes, multiple / single PRACH transmissions, and / or RACH initial transmissions / retransmissions. The RA type may be, for example, CBRA / CFRA and / or type 1 / 2 RACH. The RACH triggering method may be, for example, a RACH initialized by a PDCCH order / MAC entity / RRC. The RACH purpose may be, for example, at least one of a RACH for initial access, a RACH for SI request, a RACH for SpCell BFR, and a RACH for reconfiguration with synchronization.

[0263] In the present disclosure, A / B may mean at least one of A and B. In the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0264] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0265] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0266] The physical layer signaling may be, for example, downlink control information (DCI).

[0267] In the present disclosure, "A overlaps with B," "A overlaps with B," and "at least a portion of A overlaps with at least a portion of B" may be read as interchangeable. Also, "A overlaps with B," and "all or a portion of A overlaps with all or a portion of B" may be read as interchangeable.

[0268] The present disclosure may be applied under at least one of the following conditions: when a UE reports UE capabilities corresponding to at least one function / capability to a NW; and when a UE capability corresponding to at least one function / capability is configured / activated / instructed to the UE by higher layer signaling. The present disclosure may be applied when a specific higher layer parameter is configured / activated / instructed to the UE.

[0269] Next, the configurations of the base station 100 and the terminal 200 will be described. Note that the configurations of the base station 100 and the terminal 200 described below are examples of functions related to this embodiment. The base station 100 and the terminal 200 may have functions not shown. Furthermore, the functional divisions and / or names of the functional units are not limited as long as the functions perform the operations related to this embodiment.

[0270] <Configuration of Base Station> Fig. 22 is a block diagram showing an example of the configuration of base station 100 according to the embodiment. Base station 100 includes, for example, a transmitting unit 101, a receiving unit 102, and a control unit 103. Base station 100 communicates with terminal 200 (see Fig. 23) wirelessly.

[0271] The transmitter 101 transmits a downlink (DL) signal to the terminal 200. For example, the transmitter 101 transmits the DL signal under the control of the controller 103. The transmitter 101 transmits, for example, the various signals, channels, setting information, control information, etc. described in the above embodiments to the terminal 200 as the DL signal.

[0272] The DL signal may include, for example, a downlink data signal and control information (e.g., DCI (Downlink Control Information)). The DL signal may also include information indicating scheduling related to signal transmission of terminal 200 (e.g., an UL grant). The DL signal may also include control information of higher layers (e.g., control information of RRC (Radio Resource Control)). The DL signal may also include a reference signal.

[0273] Channels used for transmitting DL signals include, for example, a data channel and a control channel. For example, the data channel may include a PDSCH (Physical Downlink Shared Channel), and the control channel may include a PDCCH (Physical Downlink Control Channel). For example, the base station 100 transmits control information to the terminal 200 using the PDCCH and transmits downlink data signals using the PDSCH.

[0274] The reference signal included in the DL signal may include at least one of, for example, a Demodulation Reference Signal (DMRS), a Phase Tracking Reference Signal (PTRS), a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information. For example, reference signals such as the DMRS and PTRS are used for demodulating downlink data signals and are transmitted using the PDSCH.

[0275] The receiving unit 102 receives an uplink (UL) signal transmitted from the terminal 200. For example, the receiving unit 102 receives the UL signal under the control of the control unit 103. The receiving unit 102 receives, for example, a signal related to the PRACH and random access as the UL signal.

[0276] The control unit 103 controls the communication operations of the base station 100, including the transmission processing of the transmission unit 101 and the reception processing of the reception unit 102. For example, the control unit 103 performs operations other than the transmission and reception described in the above embodiment (note that these operations may be performed by the reception unit 102 and / or the transmission unit 101).

[0277] For example, the control unit 103 acquires information such as data and control information from the upper layer and outputs it to the transmitting unit 101. The control unit 103 also outputs the data, control information, etc. received from the receiving unit 102 to the upper layer.

[0278] For example, the control unit 103 allocates resources (or channels) used for transmitting and receiving DL signals and / or resources used for transmitting and receiving UL signals based on signals (e.g., data and control information, etc.) received from the terminal 200 and / or data and control information, etc. acquired from a higher layer. Information on the allocated resources may be included in control information transmitted to the terminal 200.

[0279] Control unit 103 configures PUCCH resources as an example of allocation of resources used for transmitting and receiving UL signals. Information related to PUCCH configuration (PUCCH configuration information), such as a PUCCH cell timing pattern, may be reported to terminal 200 by RRC.

[0280] Here, the transmitting unit 101 and the receiving unit 102 (which may be collectively referred to as a communication unit) communicate with the terminal 200 .

[0281] For example, the receiver 102 of the base station 100 receives a random access preamble. The controller 103 of the base station 100 determines a resource on which the terminal 200 transmits a signal related to random access after the preamble, depending on the type of resource on which the preamble is transmitted.

[0282] 23 is a block diagram showing an example of the configuration of a terminal 200 according to an embodiment. The terminal 200 includes, for example, a receiving unit 201, a transmitting unit 202, and a control unit 203. The terminal 200 communicates with the base station 100, for example, wirelessly.

[0283] The receiving unit 201 receives a DL signal transmitted from the base station 100. For example, the receiving unit 201 receives the DL signal under the control of the control unit 203.

[0284] The transmitting unit 202 transmits an UL signal to the base station 100. For example, the transmitting unit 202 transmits the UL signal under the control of the control unit 203. For example, the transmitting unit 202 transmits a signal related to the PRACH and random access to the base station 100.

[0285] The UL signal may include, for example, an uplink data signal and control information (e.g., UCI (Uplink Control Information)). For example, information related to the processing capability of the terminal 200 (e.g., capability) may be included. The UL signal may also include a reference signal.

[0286] Channels used for transmitting UL signals include, for example, data channels and control channels. For example, the data channels may include a PUSCH (Physical Uplink Shared Channel), and the control channels may include a PUCCH (Physical Uplink Control Channel). For example, the terminal 200 transmits control information from the base station 100 using the PUCCH and transmits uplink data signals using the PUSCH.

[0287] The reference signal included in the UL signal may include, for example, at least one of a DMRS, a PTRS, a CSI-RS, an SRS, and a PRS. For example, the reference signal such as the DMRS or the PTRS is used for demodulating an uplink data signal and is transmitted using an uplink channel (for example, a PUSCH).

[0288] The control unit 203 controls the communication operations of the terminal 200, including the reception processing in the receiving unit 201 and the transmission processing in the transmitting unit 202. For example, the control unit 203 performs operations other than the transmission and reception described in the above embodiment (note that these operations may be performed by the receiving unit 201 and / or the transmitting unit 202).

[0289] For example, the control unit 203 acquires information such as data and control information from the upper layer and outputs it to the transmitting unit 202. Also, the control unit 203 outputs, for example, the data and control information received from the receiving unit 201 to the upper layer.

[0290] For example, the control unit 203 controls transmission of information to be fed back to the base station 100. The information to be fed back to the base station 100 may include, for example, HARQ ACK / NACK, Channel State Information (CSI), or a Scheduling Request (SR). The information to be fed back to the base station 100 may be included in UCI. The UCI is transmitted, for example, in PUCCH resources.

[0291] Control unit 203 configures PUCCH resources based on configuration information (for example, configuration information such as a PUCCH cell timing pattern and / or DCI notified by RRC) received from base station 100. Control unit 203 determines PUCCH resources to be used for transmitting information to be fed back to base station 100. Under the control of control unit 203, transmission unit 202 transmits the information to be fed back to base station 100 in the PUCCH resources determined by control unit 203.

[0292] Note that the channel used for transmitting the DL signal and the channel used for transmitting the UL signal are not limited to the above-mentioned examples. For example, the channel used for transmitting the DL signal and the channel used for transmitting the UL signal may include a Random Access Channel (RACH) and a Physical Broadcast Channel (PBCH). The RACH may be used to transmit DCI including a Random Access Radio Network Temporary Identifier (RA-RNTI), for example.

[0293] Here, the receiving unit 201 and the transmitting unit 202 (which may be collectively referred to as a communication unit) communicate with a network such as the base station 100 .

[0294] For example, the transmitter 202 of the terminal 200 transmits a random access preamble. The controller 203 determines a resource for transmitting a signal related to random access after the preamble, depending on the type of resource on which the preamble is transmitted.

[0295] The present disclosure has been described above. Note that the division of items in the above description is not essential to the present disclosure, and items described in two or more items may be used in combination as needed, and items described in one item may be applied to items described in another item (unless they are inconsistent).

[0296] <Hardware Configuration, etc.> The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (e.g., using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining software with the single device or the multiple devices.

[0297] Functions include, but are not limited to, judgment, determination, assessment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0298] For example, a base station, a terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 24 is a diagram illustrating an example of the hardware configuration of a base station and a terminal according to an embodiment. The above-described base station 100 and terminal 200 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0299] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of base station 100 and terminal 200 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0300] Each function in the base station 100 and the terminal 200 is realized by loading specified software (programs) onto hardware such as the processor 1001 and the memory 1002, causing the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0301] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 103 and control unit 203 may be realized by the processor 1001.

[0302] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 103 of the base station 100 and the control unit 203 of the terminal 200 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may also be transmitted from a network via a telecommunications line.

[0303] The memory 1002 is a computer-readable recording medium and may be configured by, for example, at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0304] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium including at least one of memory 1002 and storage 1003.

[0305] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitter 101, receiver 102, receiver 201, transmitter 202, etc. may be realized by the communication device 1004.

[0306] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0307] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0308] Furthermore, base station 100 and terminal 200 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0309] <Notification of Information, Signaling> Notification of information is not limited to the embodiments described in the present disclosure and may be performed using other methods. For example, notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0310] <Applicable Systems> The embodiments described in the present disclosure are applicable to LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802.34 (WiMAX (registered trademark The present invention may be applied to at least one of systems using 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems that are extended, modified, created, or defined based on these systems. The present invention may also be applied to a combination of multiple systems (e.g., a combination of LTE and / or LTE-A with 5G).

[0311] <Processing Procedures, etc.> The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be rearranged unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0312] <Operation of Base Station> In the present disclosure, specific operations described as being performed by a base station may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (for example, an MME or an S-GW, etc., but are not limited to these). Although the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (for example, an MME and an S-GW) may also be used.

[0313] <Direction of Input / Output> Information, etc. (see <Information, Signal>) can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may also be input / output via multiple network nodes.

[0314] <Handling of Input / Output Information, etc.> Input / output information, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information, etc. may be overwritten, updated, or added. Output information, etc. may be deleted. Input information, etc. may be sent to another device.

[0315] <Determination method> The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0316] <Variations of Aspects, etc.> Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched depending on the implementation. In addition, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0317] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0318] <Software> Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0319] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0320] Information, Signals, etc., described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0321] Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0322] <System, Network> As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0323] <Parameter and Channel Names> Furthermore, the information, parameters, and the like described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0324] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0325] <Base Station> In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. A base station may also be referred to by terms such as a macrocell, a small cell, a femtocell, and a picocell.

[0326] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a remote radio head (RRH)). The terms "cell" or "sector" refer to part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage area.

[0327] In the present disclosure, the base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control or operate based on the information.

[0328] Mobile Station In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0329] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0330] <Base Station / Mobile Station> At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, etc. The mobile object refers to a movable object, and may move at any speed. Naturally, this also includes cases where the mobile object is stationary. Examples of the mobile object include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and objects mounted thereon. The mobile object may also be a mobile object that moves autonomously based on an operational command. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0331] Furthermore, the base station in the present disclosure may be read as a terminal. For example, the embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between multiple terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the terminal 200 may be configured to have the functions of the base station 100 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0332] Similarly, the term "terminal" in the present disclosure may be read as "base station." In this case, the base station 100 may be configured to have the functions of the terminal 200 described above.

[0333] Fig. 25 shows an example configuration of a vehicle 2001. As shown in Fig. 25, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0334] The drive unit 2002 is configured, for example, by an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0335] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0336] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0337] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing (outputting) various types of information, such as driving information, traffic information, and entertainment information, and one or more ECUs that control these devices. The information service unit 2012 provides various types of multimedia information and multimedia services to the occupants of the vehicle 2001 by using information acquired from external devices via the communication module 2013, etc.

[0338] The information service unit 2012 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0339] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0340] The communication module 2013 can communicate with the microprocessor 2031 and the components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0341] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0342] The communication module 2013 may transmit at least one of signals from the above-mentioned various sensors 2021 to 2029 input to the electronic control unit 2010, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 2012 to an external device via wireless communication. The electronic control unit 2010, the various sensors 2021 to 2029, the information service unit 2012, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above-mentioned input.

[0343] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on the information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 2013 (or data / information decoded from the PDSCH)).

[0344] Furthermore, the communication module 2013 stores various information received from external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, sensors 2021 to 2029, and the like provided in the vehicle 2001.

[0345] <Meaning and Interpretation of Terms> As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching a table, database, or other data structure), ascertaining something that is considered to be a "judging" or "determining," and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like that are considered to be a "judging" or "determining." Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0346] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0347] <Reference Signal> A reference signal can also be abbreviated as RS (Reference Signal), and may also be called a pilot depending on the applicable standard.

[0348] <Meaning of "based on"> As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0349] "First," "Second" Any reference to an element using designations such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0350] <Means> The "means" in the configuration of each device above may be replaced with "section," "circuit," "device," etc.

[0351] Open Format: When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0352] <Time Units such as TTI, Frequency Units such as RB, and Radio Frame Configuration> A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0353] Numerology may be a communication parameter that applies to the transmission and / or reception of a signal or channel, and may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0354] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol). A slot may be a time unit based on numerology.

[0355] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0356] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0357] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0358] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0359] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0360] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0361] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0362] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0363] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0364] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0365] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0366] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0367] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0368] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0369] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0370] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples, and various changes may be made to the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc.

[0371] <Maximum Transmit Power> The "maximum transmit power" in the present disclosure may refer to the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0372] Articles In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0373] <"Different"> In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that the term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0374] One aspect of the present disclosure is useful in wireless communication systems.

[0375] 100 Base station 200 Terminal 101, 202 Transmitter 102, 201 Receiver 103, 203 Controller

Claims

1. A terminal comprising: a transmitting unit that transmits a random access preamble; and a control unit that determines a resource for transmitting a signal related to the random access after the preamble according to the type of resource on which the preamble is transmitted.

2. The terminal according to claim 1, wherein, when the preamble is transmitted in a first type resource that is available as a sub-band within a time division duplex band and has a different transmission and reception direction from the band, the control unit determines that the resource for transmitting the signal related to the random access is the first type resource.

3. The terminal according to claim 1, wherein, when the preamble is transmitted in a first type of resource that can use a sub-band within a time division duplex band and that has a different transmission and reception direction from the band, the control unit determines a resource for transmitting the signal related to the random access based on an instruction from a base station connected to the terminal.

4. The terminal according to claim 1, wherein the signal related to the random access is at least one of a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) including a hybrid automatic repeat request-acknowledgement (HARQ-ACK).

5. A wireless communication system comprising: a terminal including: a transmitter that transmits a random access preamble; and a control unit that determines a resource for transmitting a signal related to the random access after the preamble depending on the type of resource on which the preamble is transmitted; and a base station including a receiver that receives the preamble.

6. A wireless communication method, wherein a terminal transmits a random access preamble, and determines a resource for transmitting a signal related to the random access after the preamble according to a type of resource on which the preamble is transmitted.

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