Method and device for transmitting / receiving signals in wireless communication system

Abstract

According to one embodiment of the present disclosure, a method and apparatus for transmitting / receiving signals in a wireless communication system include: transmitting a PRACH; and receiving a RAR based on the PRACH. The PRACH is transmitted in one or two PRACH time slots. One or two PRACH time slots are determined based on N time slots corresponding to a reference time slot. Based on applying one of a 480 kHz SCS and a 960 kHz SCS to the N time slots, a 60 kHz SCS can be applied to the reference time slot.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus used in a wireless communication system. Specifically, the present disclosure relates to a random access method and apparatus used in a wireless communication system. Background Art

[0002] In general, wireless communication systems are developing to cover a wide range of areas in various ways to provide communication services such as audio communication services, data communication services, etc. Wireless communication is a multiple-access system that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). For example, a multiple-access system may include one of a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single-carrier frequency division multiple access (SC-FDMA) system, and the like. Summary of the Invention

[0003] Technical issues

[0004] An object of the present disclosure is to provide a method and apparatus for efficiently performing a random access procedure in a wireless communication system.

[0005] Those skilled in the art will understand that the objectives that can be achieved by the present disclosure are not limited to those specifically described above, and the above and other objectives that can be achieved by the present disclosure will be more clearly understood from the following detailed description.

[0006] Technical Solution

[0007] The present disclosure provides a method and apparatus for transmitting and receiving signals in a wireless communication system.

[0008] In one aspect of the present disclosure, a method for transmitting and receiving signals by a user equipment (UE) operating in a wireless communication system is provided, the method including: transmitting a physical random access channel (PRACH); and receiving a random access response (RAR) based on the PRACH, wherein the PRACH is transmitted in one or two PRACH time slots, wherein one or two PRACH time slots are determined among N time slots corresponding to a reference time slot, wherein one of a 480 kHz subcarrier spacing (SCS) and a 960 kHz SCS is used for the N time slots, and a 60 kHz SCS is used for the reference time slot.

[0009] In another aspect of the present disclosure, a method for transmitting and receiving signals by a base station (BS) operating in a wireless communication system is provided herein, the method including: receiving a physical random access channel (PRACH); and transmitting a random access response (RAR) based on the PRACH, wherein the PRACH is transmitted in one or two PRACH time slots, wherein one or two PRACH time slots are determined among N time slots corresponding to a reference time slot, wherein one of a 480kHz subcarrier spacing (SCS) and a 960kHz SCS is used for the N time slots, and a 60kHz SCS is used for the reference time slot.

[0010] In another aspect of the present disclosure, a device, a processor, and a storage medium for performing a signal transmission / reception method are provided herein.

[0011] In the method and device, based on the number of PRACH time slots in the reference time slot being 1, the value for one PRACH time slot may be N-1.

[0012] In the method and apparatus, based on the number of PRACH slots in the reference slot not being 1, the values ​​for the two PRACH slots may be N / 2-1 and N-1.

[0013] In the method and apparatus, based on the number of PRACH slots in the reference slot not being 1, the values ​​for the two PRACH slots may be N-1 and N-2.

[0014] The communication device may include an autonomous driving vehicle that communicates with at least a UE, a network, and another autonomous driving vehicle other than the communication device.

[0015] The above aspects of the present disclosure are only some preferred embodiments of the present disclosure. Those skilled in the art can deduce and understand various embodiments reflecting the technical features of the present disclosure from the following detailed description of the present disclosure.

[0016] Beneficial effects

[0017] According to the embodiments of the present disclosure, a communication device can perform a random access procedure more efficiently in a different manner from the prior art.

[0018] Those skilled in the art will understand that the effects that can be achieved using the present disclosure are not limited to those specifically described above, and other advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shows the radio frame structure.

[0020] Figure 2 The resource grid during the duration of a time slot is shown.

[0021] Figure 3 Shows a self-contained slot structure.

[0022] Figure 4 A wireless communication system supporting unlicensed bands is shown.

[0023] Figure 5 An exemplary method for occupying resources in an unlicensed band is shown.

[0024] Figure 6 and Figure 7 is a flow chart illustrating a channel access procedure (CAP) for signal transmission in an unlicensed band.

[0025] Figure 8 and Figure 9 is a diagram illustrating a signal flow for a random access procedure;

[0026] Figure 10 Resource block (RB) interleaving is shown.

[0027] Figures 11 to 35 is a diagram illustrating uplink (UL) channel transmission according to an embodiment of the present disclosure.

[0028] Figures 36 to 39 A device according to an embodiment of the present disclosure is illustrated. DETAILED DESCRIPTION

[0029] The following technologies may be used in various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single-carrier frequency division multiple access (SC-FDMA). CDMA may be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented as a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented as a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wireless Fidelity (WiFi)), IEEE 802.16 (Worldwide Interoperability for Microwave Access (WiMAX)), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, and LTE-Advanced (LTE-A) is an evolution of 3GPP LTE. 3GPP New Radio or New Radio Access Technology (NR) is an evolved version of 3GPP LTE / LTE-A.

[0030] For clarity of description, the present disclosure will be described in the context of 3GPP communication systems (e.g., LTE and NR), which should not be construed as limiting the spirit of the present disclosure. LTE refers to technology that goes beyond 3GPP TS 36.xxx version 8. Specifically, LTE technology that goes beyond 3GPP TS 36.xxx version 10 is called LTE-A, and LTE technology that goes beyond 3GPP TS 36.xxx version 13 is called LTE-A pro. 3GPP NR is a technology that goes beyond 3GPP TS 38.xxx version 15. LTE / NR may be referred to as a 3GPP system. "xxx" designates a technical specification number. LTE / NR may be collectively referred to as a 3GPP system. Background technology, terms, abbreviations, etc. as used herein refer to technical specifications published prior to this disclosure. For example, reference may be made to the following documents.

[0031] 3GPP LTE

[0032] -36.211: Physical channels and modulation

[0033] -36.212: Multiplexing and channel coding

[0034] -36.213: Physical layer procedures

[0035] -36.300: General description

[0036] -36.331: Radio Resource Control (RRC)

[0037] 3GPP NR

[0038] -38.211: Physical channels and modulation

[0039] -38.212: Multiplexing and Channel Compilation

[0040] -38.213: Physical layer procedures for control

[0041] -38.214: Physical layer procedures for data

[0042] -38.300: NR and NG-RAN general description

[0043] -38.331: Radio Resource Control (RRC) Protocol Specification

[0044] Figure 1 The radio frame structure for NR is shown.

[0045] In NR, UL and DL transmissions are configured on a frame basis. Each radio frame has a length of 10 ms and is divided into two 5 ms half-frames. Each half-frame is divided into five 1 ms subframes. A subframe is divided into one or more time slots, and the number of time slots in a subframe depends on the subcarrier spacing (SCS). Depending on the cyclic prefix (CP), each time slot includes 12 or 14 OFDM (A) symbols. When a normal CP is used, each time slot includes 14 OFDM symbols. When an extended CP is used, each time slot includes 12 OFDM symbols. Symbols may include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or discrete Fourier transform-extended-OFDM (DFT-s-OFDM) symbols).

[0046] Table 1 exemplarily shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS in the normal CP case.

[0047] [Table 1]

[0048] SCS(15*2^u) <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 15KHz (u=0) 14 10 1 30KHz (u=1) 14 20 2 60KHz (u=2) 14 40 4 120KHz (u=3) 14 80 8 240KHz (u=4) 14 160 16

[0049] *N slot symb : The number of symbols in a time slot

[0050] *N frame，u slot : Number of time slots in a frame

[0051] *N subframe，u slot : Number of time slots in a subframe

[0052] Table 2 shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS in the case of extended CP.

[0053] [Table 2]

[0054] SCS(15*2^u) <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 60KHz (u=2) 12 40 4

[0055] In the NR system, different OFDM(A) parameter sets (e.g., SCS, CP length, etc.) can be configured for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of a time resource (e.g., a subframe, a time slot, or a transmission time interval (TTI)) consisting of the same number of symbols (for convenience, referred to as a time unit (TU)) can be configured differently between the aggregated cells.

[0056] Figure 2 The resource grid during the duration of one time slot is shown.

[0057] A time slot includes multiple symbols in the time domain. For example, a time slot includes 14 symbols in the normal CP case and 12 symbols in the extended CP case. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain. Multiple RB interleavings (abbreviated as interleavings) can be defined in the frequency domain. Interleaving m∈{0, 1, ..., M-1} can be composed of (common) RBs{m, M+m, 2M+m, 3M+m, ...}. M represents the number of interleavings. A bandwidth part (BWP) can be defined by multiple consecutive (physical) RBs ((P)RBs) in the frequency domain and corresponds to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., five) BWPs. Data communication can be performed in an active BWP, and only one BWP can be enabled for a UE. Each element in the resource grid can be called a resource element (RE), to which a complex symbol can be mapped.

[0058] Figure 3 Shows the structure of a self-contained time slot.

[0059] In the NR system, the frame has a self-contained structure in which DL control channels, DL or UL data, UL control channels, etc. can all be included in one time slot. For example, the first N symbols in the time slot (hereinafter referred to as the DL control region) can be used to send DL control channels, and the last M symbols in the time slot (hereinafter referred to as the UL control region) can be used to send UL control channels. N and M are integers greater than or equal to 0. The resource region (hereinafter referred to as the data region) between the DL control region and the UL control region can be used for DL ​​data transmission or UL data transmission. For example, the following configuration can be considered. List the various parts in chronological order.

[0060] 1. DL configuration only

[0061] 2. UL configuration only

[0062] 3. Hybrid UL-DL configuration

[0063] -DL area + guard period (GP) + UL control area

[0064] -DL control area + GP + UL area

[0065] *DL area: (i) DL data area, (ii) DL control area + DL data area

[0066] *UL area: (i) UL data area, (ii) UL data area + UL control area

[0067] The PDCCH can be transmitted in the DL control region, and the PDSCH can be transmitted in the DL data region. The PUCCH can be transmitted in the UL control region, and the PUSCH can be transmitted in the UL data region. The GP provides a time gap when the UE switches from transmit mode to receive mode or vice versa. Some symbols within a subframe when switching from DL to UL can be configured as GPs.

[0068] In the present disclosure, a base station (BS) may be, for example, a gNode B (gNB).

[0069] 1. Support unlicensed wireless communication systems

[0070] Figure 4 An exemplary wireless communication system supporting unlicensed bands suitable for use with the present disclosure is illustrated.

[0071] In the following description, a cell operating in the licensed band (L band) is defined as an L cell, and the carrier of the L cell is defined as a (DL / UL) LCC. A cell operating in the unlicensed band (U band) is defined as a U cell, and the carrier of the U cell is defined as a (DL / UL) UCC. The carrier / carrier frequency of a cell may refer to the operating frequency (e.g., center frequency) of the cell. A cell / carrier (e.g., CC) is generally referred to as a cell.

[0072] When the UE and BS are Figure 4 When transmitting and receiving signals in the LCC and UCC of the carrier aggregation shown in (a), the LCC may be configured as a primary CC (PCC) and the UCC may be configured as a secondary CC (SCC). Figure 4 As shown in (b), the UE and the BS can transmit and receive signals in one UCC or a plurality of carrier-aggregated UCCs. That is, the UE and the BS can transmit and receive signals only in a UCC without an LCC.

[0073] Unless otherwise stated, the signal transmission / reception operations in the unlicensed band described in the present disclosure may be performed based on all the above-mentioned deployment scenarios.

[0074] Radio frame structure for unlicensed bands

[0075] Recently, the 3GPP standardization organization has begun to standardize a 5G wireless communication system named New RAT (NR). The 3GPP NR system has been designed to provide multiple logical networks in a single physical system and support services with various requirements (e.g., eMBB, mMTC, URLLC, etc.) by changing the transmission time interval (TTI) and / or OFDM parameter set (e.g., OFDM symbol duration, SCS, etc.). In recent years, with the emergence of smart devices, data services have increased significantly. Therefore, as in the Licensed Assisted Access (LAA) of the traditional 3GPP LTE system, the 3GPP NR system also considers using the unlicensed band for cellular communications. However, unlike LAA, the NR cell (NR U cell) in the unlicensed band is designed to support independent operation. For example, PUCCH, PUSCH and / or PRACH transmission can be supported in the NRUCell.

[0076] Figure 1 The NR frame structure can be used for operation in the unlicensed band. The configuration of OFDM symbols occupied for UL / DL signal transmission in the frame structure used for the unlicensed band can be configured by the base station. The term OFDM symbol can be replaced by SC-FDM(A) symbol.

[0077] In the following description, multiple CCs (CC indices) (i.e., CC (index)-BWP (index) combinations) may be replaced with multiple BWPs (BWP indices) configured in one (or more) CCs or (serving) cells, or multiple CCs / cells each including multiple BWPs. In this case, the principles and operations of the present disclosure may also be applied in the same manner.

[0078] Figure 5 The figure illustrates an exemplary method for occupying resources in an unlicensed band. According to regional regulations for the U-band, communication nodes in the U-band need to determine whether other communication nodes are using the corresponding channel before sending a signal. Specifically, the communication node can perform carrier sensing (CS) before sending a signal to check whether other communication nodes are performing signal transmission. When other communication nodes do not perform signal transmission, it can be said that the clear channel assessment (CCA) is confirmed. When the CCA threshold is predefined or configured by higher-layer signaling (e.g., RRC signaling), if the detected channel energy is higher than the CCA threshold, the communication node can determine that the channel is busy. Otherwise, the communication node can determine that the channel is idle. When it is determined that the channel is idle, the communication node can start signal transmission in the UCell. The Wi-Fi standard (802.11ac) specifies a CCA threshold of -62dBm for non-Wi-Fi signals and a CCA threshold of -82dBm for Wi-Fi signals. The above series of processes can be referred to as listen-before-talk (LBT) or channel access procedure (CAP). LBT can be used interchangeably with CAP or CCA.

[0079] Specifically, for DL ​​reception / UL transmission in the unlicensed band, the following one or more channel access procedure (CAP) methods may be used in a wireless communication system related to the present disclosure.

[0080] Method for transmitting DL signal in unlicensed band

[0081] In order to transmit a DL signal in the unlicensed band, the BS may indicate the configuration of OFDM symbols used in subframe #n to the UE through signaling.The term subframe may be replaced with a slot or a time unit (TU).

[0082] The BS may perform one of the following unlicensed band access procedures (eg, CAP) to transmit a DL signal in the unlicensed band.

[0083] (1) First DL CAP method

[0084] Figure 6 is a flowchart illustrating DL CAP for DL ​​signal transmission in an unlicensed band performed by a BS.

[0085] For DL ​​signal transmission (e.g., transmission of DL signals such as PDSCH / PDCCH / enhanced PDCCH (EPDCCH)), the BS may initiate CAP (S1210). According to step 1, the BS may randomly select a backoff counter N within a contention window (CW). N is set to an initial value N init (S1220). N init is selected from 0 to CW p A random value between the values ​​​​of . Subsequently, when the backoff counter value N is 0 according to step 4 (S1230; Yes), the BS terminates the CAP (S1232). Then, the BS may perform Tx burst transmission, including transmission of PDSCH / PDCCH / EPDCCH (S1234). In contrast, when the backoff counter value N is not 0 (S1230; No), according to step 2, the BS decrements the backoff counter value by 1 (S1240). Subsequently, the BS checks whether the channel of the U cell is idle (S1250). If the channel is idle (S1250; Yes), the BS determines whether the backoff counter value is 0 (S1230). In contrast, when the channel is not idle, that is, the channel is busy (S1250; No), according to step 5, the BS determines to delay the transmission for a duration T longer than the slot duration (e.g., 9 microseconds). d (25 microseconds or longer) period (S1260). If the channel is idle during the deferral duration (S1270; Yes), the BS may resume the CAP. The deferral duration may include a duration of 16 microseconds and the following m pContinuous time slot durations (eg, each continuous time slot duration is 9 microseconds). In contrast, if the channel is busy during the deferral duration (S1270; No), the BS rechecks whether the channel of the U cell is idle during the new deferral duration by performing step S1260 again.

[0086] Table 3 shows m p , minimum CW, maximum CW, maximum channel occupancy time (MCOT), and allowed CW size applied to the CAP vary according to the channel access priority category.

[0087] [Table 3]

[0088]

[0089] The CW size applied to the first DL CAP can be determined in various ways. For example, the CW size can be adjusted based on the probability that the HARQ-ACK value corresponding to the PDSCH transmission within a predetermined time period (e.g., a reference TU) is determined to be NACK. In the case where the BS performs a DL transmission including a PDSCH associated with a channel access priority category p on a carrier, if the probability z that the HARQ-ACK value corresponding to the PDSCH transmission in the reference subframe k (or reference time slot k) is determined to be NACK is at least 80%, the BS increases the CW value set for each priority category to the next higher allowed value. Alternatively, the BS maintains the CW value set for each priority category as an initial value. The reference subframe (or reference time slot) can be defined as the starting subframe (or time slot) of the most recent transmission on the carrier performed by the BS for which at least some HARQ-ACK feedback is expected to be available.

[0090] (2) Second DL CAP method

[0091] The BS may perform DL signal transmission (eg, signal transmission including discovery signal transmission without PDSCH) in the unlicensed band according to a second DL CAP method described below.

[0092] When the signal transmission duration of the BS is equal to or less than 1 ms, the BS is sensed for at least the sensing duration T drs After the channel is idle within T = 25 us, the BS may immediately transmit a DL signal (eg, a signal including a discovery signal but without a PDSCH) in the unlicensed band. drs Included in a sensing time slot duration T sl (=9us) after the duration T f (=16us).

[0093] (3) Third DL CAP method

[0094] The BS may perform the following CAP for DL ​​signal transmission on multiple carriers in the unlicensed band.

[0095] 1) Type A: The BS performs CAP on a plurality of carriers based on a counter N defined for each carrier (counter N considered in CAP), and performs DL signal transmission based on the CAP.

[0096] - Type A1: The counter N for each carrier is independently determined, and a DL signal is transmitted on each carrier based on the counter N of the carrier.

[0097] - Type A2: A counter N of a carrier having a maximum CW size is set for each carrier, and a DL signal is transmitted on each carrier based on the counter N for the carrier.

[0098] 2) Type B: The BS performs CAP based on the counter N only for a specific one of a plurality of carriers, and performs DL signal transmission by checking whether channels of other carriers are idle before signal transmission on the specific carrier.

[0099] - Type B1: A single CW size is defined for multiple carriers, and the BS uses the single CW size in a counter N-based CAP for a specific carrier.

[0100] – Type B2: The CW size is defined for each carrier, and the largest CW size is used to determine Ninit for a specific carrier.

[0101] Method for transmitting UL signal in unlicensed band

[0102] For UL signal transmission in the unlicensed band, the BS may transmit information about the UL transmission period to the UE through signaling.

[0103] For UL signal transmission in the unlicensed band, the UE performs contention-based CAP. For example, the UE may perform Type 1 CAP or Type 2 CAP for UL signal transmission in the U-band. Generally, the UE may perform a CAP (e.g., Type 1 CAP or Type 2 CAP) configured / indicated by the BS for UL signal transmission.

[0104] (1) Type 1 UL CAP method

[0105] Figure 7 is a flow chart illustrating Type 1 CAP operations of a UE for UL signal transmission.

[0106] In order to transmit a signal in the U band, the UE may initiate a CAP (S1510). The UE may randomly select a backoff counter N within the contention window (CW) according to step 1. In this case, N is set to an initial value Ninit (S1520). N init Can have 0 and CW p A random value between . If it is determined according to step 4 that the backoff counter value (N) is 0 ("Yes" in S1530), the UE terminates the CAP (S1532). Then, the UE may perform Tx burst transmission (S1534). If the backoff counter value is non-zero ("No" in S1530), the UE reduces the backoff counter value by 1 according to step 2 (S1540). The UE checks whether the channel of the U cell is idle (S1550). If the channel is idle ("Yes" in S1550), the UE checks whether the backoff counter value is 0 (S1530). On the contrary, if the channel is not idle in S1550, that is, if the channel is busy ("No" in S1550), the UE checks according to step 5 whether the corresponding channel is idle for the postponement duration T d (greater than or equal to 25 microseconds) idle (S1560), the postponement duration T d The delay time may be longer than the slot duration (e.g., 9 microseconds). If the channel is idle within the delay time ("Yes" in S1570), the UE may resume the CAP. Here, the delay time may include a duration of 16 microseconds and m p The UE performs step S1560 again to check whether the channel is idle for the new deferral duration.

[0107] Table 4 shows the m applied to CAP p The values ​​of , minimum CW, maximum CW, maximum channel occupancy time (MCOT), and allowed CW size vary depending on the channel access priority class.

[0108] [Table 4]

[0109]

[0110] The size of the CW applied to the Type 1 UL CAP can be determined in various ways. For example, the CW size can be adjusted depending on whether the value of the new data indicator (NDI) for at least one HARQ process associated with HARQ_ID_ref is switched, where the HARQ_ID_ref is the HARQ process ID of the UL-SCH in a predetermined time period (e.g., a reference TU). When a UE performs signal transmission using a Type 1 CAP associated with a channel access priority category p on a carrier, if the value of the NDI for at least one HARQ process associated with the HARQ_ID_ref is switched, the UE can set the CW size to 1 for each priority category p∈{1,2,3,4}. p Set to CW min，p Otherwise, the UE may set CW to p Increase to the next higher allowed value.

[0111] The reference subframe (or time slot) n is determined as follows ref .

[0112] When the UE is in subframe (or time slot) n g Receive UL grant in subframe (or time slot) n0 and send UL grant in subframe (or time slot) n0, n1, ... n1 without gaps starting from subframe (or time slot) n0. w UL-SCH is sent in subframe (or time slot) n w is the subframe (or time slot) n in which the UE has transmitted UL-SCH based on Type 1 CAP g -3) before the most recent subframe (or time slot), reference subframe (or time slot) n ref It is subframe (or time slot) n0.

[0113] (2) Type 2 UL CAP method

[0114] When the UE uses Type 2 CAP to transmit UL signals (including PUSCH) in the U band, the UE may use the sensing period T of at least 25 us. short_ul After the internal sensing detects that the channel is idle, the UL signal (including PUSCH) is immediately sent in the U band. short_ul Including 16us duration T f , which is followed by a time slot duration T of 9us sl Afterwards. f Includes an idle time slot duration T at its beginning sl .

[0115] 2. Random Access Process

[0116] Figure 8 The random access procedure is shown. Figure 8 (a) shows the contention-based random access procedure, and Figure 8 (b) shows a dedicated random access procedure.

[0117] refer to Figure 8 (a) The contention-based random access procedure includes the following four steps. The messages sent in steps 1 to 4 may be referred to as message 1 (Msg1) to message 4 (Msg4), respectively.

[0118] - Step 1: UE sends RACH preamble on PRACH.

[0119] - Step 2: The UE receives a Random Access Response (RAR) from the BS on the DL-SCH.

[0120] -Step 3: The UE sends a layer 2 (L2) / layer 3 (L3) message to the BS on the UL-SCH.

[0121] -Step 4: The UE receives a contention resolution message from the BS on the DL-SCH.

[0122] The UE may receive random access information in system information from the BS.

[0123] When the UE needs random access, the UE transmits a RACH preamble to the BS as in step 1, and the BS can identify each RACH preamble by the time / frequency resource (RACH opportunity (RO)) in which the RACH preamble is transmitted and a preamble index (PI).

[0124] Upon receiving the RACH preamble from the UE, the BS sends a RAR message to the UE, as in step 2. To receive the RAR message, the UE monitors the L1 / L2 PDCCH with a cyclic redundancy check (CRC) masked with a random access RNTI (RA-RNTI) within a preconfigured time window (e.g., ra-ResponseWindow), which includes scheduling information for the RAR message. The PDCCH masked with the RA-RNTI can be sent only in the common search space. When receiving the scheduling signal masked with the RA-RNTI, the UE can receive the RAR message on the PDSCH indicated by the scheduling information. The UE then checks whether there is RAR information directed to the UE in the RAR message. The presence or absence of RAR information directed to the UE can be determined by checking whether there is a random access preamble ID (RAPID) for the preamble sent by the UE. The index of the preamble sent by the UE can be the same as the RAPID. The RAR information includes the index of the corresponding RACH preamble, timing offset information for UL synchronization (e.g., Timing Advance Command (TAC)), UL scheduling information for Msg3 transmission (e.g., UL grant), and UE temporary identification information (e.g., Temporary C-RNTI (TC-RNTI)).

[0125] Upon receiving the RAR information, the UE sends UL-SCH data (Msg3) on the PUSCH according to the UL scheduling information and the timing offset value, as in step 3. Msg3 may include the UE's ID (or global ID). Alternatively, Msg3 may include RRC connection request related information (e.g., RRCSetupRequest message) for initial access. In addition, Msg3 may include a buffer status report (BSR) regarding the amount of data available for transmission at the UE.

[0126] After receiving the UL-SCH data, the BS sends a contention resolution message (Msg4) to the UE, as in step 4. When the UE receives the contention resolution message and the contention resolution is successful, the TC-RNTI is changed to the C-RNTI. Msg4 may include the UE ID and / or RRC connection related information (e.g., RRCSetup message). When the information sent in Msg3 does not match the information received in Msg4, or when the UE does not receive Msg4 within a predetermined time, the UE may resend Msg3 and determine that the contention resolution has failed.

[0127] refer to Figure 8(b) The dedicated random access procedure includes the following three steps. The messages sent in steps 0 to 2 may be referred to as Msg0 to Msg2, respectively. The BS may trigger the dedicated random access procedure via the PDCCH, which serves the purpose of commanding the transmission of a RACH preamble (hereinafter referred to as a PDCCH command).

[0128] -Step 0: The BS allocates a RACH preamble to the UE through dedicated signaling.

[0129] Step 1: The UE sends a RACH preamble on the PRACH.

[0130] Step 2: The UE receives the RAR from the BS on the DL-SCH.

[0131] Steps 1 and 2 of the dedicated random access procedure may be the same as steps 1 and 2 of the contention-based random access procedure.

[0132] In NR, DCI format 1_0 is used to initiate a non-contention-based random access procedure via a PDCCH command. DCI format 1_0 is used to schedule the PDSCH in a DL cell. When the CRC of DCI format 1_0 is scrambled with the C-RNTI and all bits of the "Frequency Domain Resource Assignment" field are 1, DCI format 1_0 is used as a PDCCH command to indicate a random access procedure. In this case, the fields of DCI format 1_0 are configured as follows.

[0133] -RA preamble index: 6 bits

[0134] -UL / Supplementary UL (SUL) indicator: 1 bit. When all bits of the RA preamble index are non-zero and SUL is configured for UEs in the cell, the UL / SUL indicator indicates the UL carrier in which PRACH is transmitted in the cell. Otherwise, it is reserved.

[0135] -SSB (Synchronization Signal / Physical Broadcast Channel) Index: 6 bits. When all bits of the RA preamble index are non-zero, the SSB indicator indicates the SSB used to determine the RACH timing for PRACH transmission. Otherwise, it is reserved.

[0136] -PRACH Masking Index: 4 bits. When all bits of the RA Preamble Index are non-zero, the PRACH Masking Index indicates the RACH opportunity associated with the SSB indicated by the SSB Index. Otherwise, it is reserved.

[0137] - Reserved: 10 bits

[0138] When DCI format 1_0 does not correspond to a PDCCH command, DCI format 1_0 includes fields for scheduling PDSCH (eg, time domain resource assignment, modulation and coding scheme (MCS), HARQ process number, PDSCH to HARQ_feedback timing indicator, etc.).

[0139] 2-step random access process

[0140] In the prior art, random access is performed through the four-step process described above. In a conventional LTE system, the four-step random access process takes an average of 15.5 ms.

[0141] [Table 5]

[0142]

[0143] The NR system may require a lower waiting time than a conventional system. When random access occurs in the U band, the random access can be terminated only when the UE and the BS successfully perform LBT sequentially in all steps of the 4-step random access process, that is, the contention can be resolved. If LBT fails in even one step of the 4-step random access process, resource efficiency may be reduced and the waiting time may increase. If LBT fails in the scheduling / transmission process associated with Msg2 or Msg3, resource efficiency may be significantly reduced and the waiting time may be significantly increased. For random access in the L band, low waiting time may be required in various scenarios of the NR system. Therefore, the 2-step random access process can also be performed in the L band.

[0144] In order to reduce the waiting time in the random access process, a two-step random access process is proposed in the present disclosure.

[0145] like Figure 9 As shown in (a), the 2-step random access procedure may include two steps: transmission of a UL signal from the UE to the BS (referred to as MsgA) and transmission of a DL signal from the BS to the UE (referred to as MsgB).

[0146] The following description focuses on the initial access procedure, but the proposed method can also be applied to the random access procedure after the UE and the BS establish an RRC connection. Figure 9 As shown in (b), the random access preamble and the PUSCH part can be sent together in the non-contention random access process.

[0147] Although not shown, the BS may transmit a PDCCH for scheduling MsgB to the UE, which may be referred to as MsgBPDCCH.

[0148] RB interweaving

[0149] Figure 10 RB interleaving is shown. In a shared spectrum, taking into account the provisions on occupied channel bandwidth (OCB) and power spectral density (PSD), a set of non-contiguous RBs (at regular intervals) in the frequency domain (or a single RB) can be defined as a resource unit used / allocated to transmit UL (physical) channels / signals. For convenience, such a set of non-contiguous RBs is defined as an RB interleave (or interleave).

[0150] Reference Figure 10 , multiple RB interlaces (interlaces) can be defined in a frequency bandwidth. Here, the frequency bandwidth may include a (wideband) cell / CC / BWP / RB set, and the RB may include a PRB. For example, interlace #m∈{0,1,...,M-1} may consist of (common) RBs{m,M+m,2M+m,3M+m,...}, where M represents the number of interlaces. A transmitter (e.g., a UE) may use one or more interlaces to transmit a signal / channel. The signal / channel may include a PUCCH or a PUSCH.

[0151] The signal / channel may include PUCCH, PUSCH and / or PRACH.

[0152] 3. PRACH transmission in high frequency band

[0153] The above contents (NR frame structure, U-band system, etc.) can be applied in combination with the method according to the present disclosure described later, or can be supplemented to clarify the technical features of the method proposed in the present disclosure.

[0154] In addition, the method described later is related to uplink transmission and can be equally applied to the uplink signal transmission method in the above-mentioned NR system (licensed band) or U-band system (unlicensed band). It should also be noted that the embodiments of the present disclosure can be modified or replaced to suit the terms, expressions, structures, etc. defined in each system, so that the technical ideas proposed in the present disclosure can be implemented in the corresponding system.

[0155] For example, downlink transmission using the method described below may be performed in an L cell and / or a U cell defined in a U-band system.

[0156] In cellular communication systems such as LTE / NR systems, utilization of not only unlicensed bands such as the 2.4 GHz band mainly used by conventional Wi-Fi systems but also unlicensed bands such as the 5 / 6 GHz and 60 GHz bands for traffic offloading is under discussion.

[0157] As mentioned above, in the Wi-Fi standard (802.11ac), the CCA threshold is defined as -62dBm for non-Wi-Fi signals and -82dBm for Wi-Fi signals. In other words, when a Wi-Fi system station (STA) or access point (AP) receives a signal from a device that is not part of the Wi-Fi system at a power of -62dBm or higher in a specific band, it skips signal transmission in that specific band.

[0158] In this disclosure, the term "unlicensed band" may be replaced or used interchangeably with "shared spectrum".

[0159] NR systems support a variety of numerologies and SCSs to support a variety of services. For example, when the SCS is 15 kHz, NR systems support the wide area of ​​traditional cellular bands. When the SCS is 30 kHz or 60 kHz, NR systems support dense urban areas, lower latency, and wider carrier bandwidths. When the SCS is 60 kHz or higher, NR systems support bandwidths greater than 24.25 GHz to overcome phase noise.

[0160] The NR frequency band is defined as two types of frequency ranges, FR1 and FR2. FR1 and FR2 can be configured as shown in Table 6. FR2 can represent millimeter wave (mmW).

[0161] [Table 6]

[0162] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 450MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0163] Bands higher than the FR1 and FR2 bands (eg, the 52.6 GHz to 114.25 GHz band, particularly 71 GHz) are referred to as FR4.

[0164] FR4 tape may be used as the unlicensed tape.

[0165] The configuration of PRACH transmission timing for the legacy FR2 area is Figure 11 is shown in . Figure 11 is an extract from section 5.3.2 of document 3GPP TS 38.211, and Tables 6.3.3.2-2 to 6.3.3.2-4 refer to the tables in document 3GPP TS 38.211. Figure 11, the configuration of PRACH transmission opportunities is defined based on the time slots of the 60kHz SCS. When a 120kHz SCS is used, two time slots corresponding to the 120kHz SCS may exist in one time slot corresponding to the 60kHz SCS. Therefore, a method of selecting one or two of the two time slots corresponding to one time slot of the 60kHz SCS as PRACH transmission opportunities when the 120kHz SCS is used is described. In the present disclosure, a time slot of a YkHz SCS corresponding to a time slot of an XkHz SCS (where X and Y are any positive numbers and X is less than Y) may mean a time slot of YkHz that can be included in the time interval occupied by the time slot of the XkHz SCS. In general, the time slot of the YkHz SCS is included in the time slot of the XkHz SCS in a ratio of X to Y. For example, the time slot of 480kHz corresponding to the 60kHz SCS may be 8 time slots (because 60:480=1:8).

[0166] exist Figure 11 In the , when the value of the parameter "PRACH slot number in 60kHz slot" is 1, only one of the two slots of 120kHz SCS corresponding to one slot of 60kHz SCS is used as a slot for PRACH transmission. Figure 11 , the latter of the two time slots of the 120kHz SCS is used as a time slot for PRACH transmission (ie, ).

[0167] When the value of the parameter "PRACH timeslot number in 60kHz timeslot" is 2 (this case is Figure 11 , however, the value of “PRACH slot number within 60kHz slot” is only 1 or 2, and therefore, “otherwise” refers to 2), both time slots of the 120kHz SCS corresponding to one time slot of the 60kHz SCS are used as time slots for PRACH transmission (i.e., ).

[0168] In the FR4 region, SCS values ​​greater than 120 kHz SCS (e.g., 240 kHz, 480 kHz, 960 kHz) are considered. Currently, there is no method for configuring PRACH transmission timings and PRACH configuration tables for SCS values ​​greater than 120 kHz SCS. Therefore, a method for configuring PRACH transmission timings for high frequency bands is needed.

[0169] The method proposed below can be considered as a PRACH transmission opportunity configuration method for FR4. In the method proposed below, the reference SCS refers to the SCS used as a reference for defining the PRACH configuration table. The reference SCS is used as a reference for configuring the single slot size required for PRACH transmission opportunities using an SCS larger than the reference SCS. For example, for FR2, a 60kHz SCS is the reference SCS, and up to a 120kHz SCS is supported.

[0170] In addition, the method proposed below is mainly described based on the PRACH transmission timing of 4-step RACH, but can be equally or similarly applied to the PRACH transmission timing and / or PUSCH transmission timing for 2-step RACH. In the following, the PRACH transmission timing is referred to as RO, and the PUSCH transmission timing is referred to as PO. In addition, Figure 11 The PRACH time slot can be called a RACH time slot.

[0171] [Proposed Method 1: Define 60kHz as the reference SCS, and in addition Figure 11 In addition to the equation for RACH time slot calculation in [ , define the RACH time slot calculation method for the new SCS value]

[0172] In the first method, the previously defined PRACH configuration table for FR2 (Tables 6.3.3.2-2 to 6.3.3.2-4 of document 3GPP TS 38.211) is used even in the FR4 area, and the 60kHz SCS is defined as the reference SCS as in the existing FR2. In FR4, SCSs of 120kHz, 240kHz, 480kHz, and 960kHz can be additionally introduced.

[0173] For a single time slot of a 60kHz SCS, a different number of N time slots may correspond to each SCS considered in FR4. The value of is {0,1,…,N-1}. N can be a value obtained by dividing each SCS value considered in FR4 by 60kHz SCS. For example, in the case of 240kHz SCS, The possible values ​​of are {0,1,2,3}. In the case of 960kHz SCS, The possible values ​​of are {0,1,…,15}. Below, It can be called "the value used for the PRACH time slot".

[0174] [Equation 1]

[0175]

[0176] According to the proposed method 1, two values can be selected among the possible values for each SCS according to specific rules, and the PRACH configuration table for FR2 can be reused. The two selected values can be reinterpreted as the first time slot defined for 120 kHz in the PRACH configuration table ( the part replaced in Figure 11 in the replaced part) or the second time slot (the part replaced in in Table 11).

[0177] For example, the smaller of the two selected values can be reinterpreted as the first time slot (corresponding to the part in Figure 11 in ), and the larger value can be reinterpreted as the second time slot (corresponding to the part in Figure 11 in ). As a specific example, when the two selected values are a and b (a < b), the part replaced in Figure 11 in can be reinterpreted as (for the first time slot), and the part replaced in Figure 11 in can be reinterpreted as (for the second time slot).

[0178] As one of the specific rules for selecting two values among the possible values for each SCS, two maximum values (i.e., N - 1, N - 2) can be selected from 0 to N - 1 that can be values of as . Alternatively, the maximum number and the median value (i.e., N - 1, N / 2 - 1) can be selected. In Figure 10 an example of the PRACH transmission opportunity given when two maximum values (i.e., N - 1, N - 2) are selected is shown. Additionally,​​​​​​​​In an example of the proposed Method 1, selecting the time slots corresponding to the two largest numbers (N-2, N-1) as the PRACH transmission occasion results in a single time slot based on 60kHz SCS setting the PRACH transmission occasion as the last time slot (based on an SCS greater than 60kHz). This result has an advantage in determining the effectiveness of the PRACH transmission occasion because UL symbols are likely to appear later in the TDD configuration.

[0180] As another example, selecting the largest number and the median (N / 2-1, N-1) has the advantage of widening the PRACH transmission occasion time interval and thus time diversity can be obtained.

[0181] [Proposed Method 1-A: Define 60kHz as the reference SCS and configure one (or two) RACH time slots for the new SCS value in addition to the equation for RACH time slot calculation in Figure 11

[0182] In addition to the proposed Method 1, the BS can indicate to the UE one or two time slot indices that may be among the values in the above equation through higher layer signaling (e.g., SIB or dedicated RRC signaling).

[0183] For example, when the BS sets the "number of PRACH time slots within a 60kHz time slot" to 1, the UE can configure the PRACH transmission occasion in time slot N-1 (i.e., the last time slot among the N time slots corresponding to the 60kHz SCS single time slot duration). The UE can configure the PRACH transmission occasion in a specific time slot (time slot k) indicated by the BS. Thereafter, the UE can send a PRACH preamble through the specified PRACH transmission occasion.

[0184] As another example, when the BS sets the "number of PRACH time slots within a 60kHz time slot" to 2, two time slot indices indicated by the BS can be used. The UE can reinterpret the smaller of the two values indicated by the BS as the first time slot (corresponding to the part of Figure 11 in or the second time slot (corresponding to the part of Figure 11 in ). For example, the smaller of the two selected values can be reinterpreted as the first time slot (corresponding to the part of Figure 11 in ), and the larger value can be reinterpreted as the second time slot (corresponding to the part of Figure 11 in ). As a specific example, when the two selected values are a and b (a < b), the part that is replaced with in Figure 11 in can be reinterpreted as​​ (for the first time slot), and Figure 11 middle The replaced part can be reinterpreted as (For the second time slot).

[0185] Alternatively, the BS can distinguish between the time slot values ​​used as the first time slot and the second time slot and indicate them separately to the UE. Alternatively, the BS can indicate only the time slot index corresponding to the first time slot as time slot k, and configure the time slot index corresponding to the second time slot as time slot N-1 (i.e., the last time slot among the N time slots corresponding to the 60kHz SCS single-slot duration). Thereafter, the UE can configure a PRACH transmission opportunity in the indicated / configured time slot and send a PRACH preamble therethrough.

[0186] With the proposed method, it is necessary to modify the equations used to configure the existing FR2 PRACH configuration table and PRACH transmission opportunities.

[0187] [Proposed method 1-B: Configure 60 kHz as the reference SCS timeslot and configure 480 / 960 kHz RACH timeslot based on the 120 kHz RACH timeslot if the configuration of the 120 kHz RACH timeslot is received]

[0188] BS can be based on Figure 11 Next, when the SCS to be actually used in the RACH process is set to 480kHz and / or 960kHz, the following method can be used to configure / indicate the RACH time slot.

[0189] [Method 1-B-1] A specific one of a plurality of 480 kHz time slots and / or 960 kHz time slots corresponding to a 120 kHz RACH time slot (e.g., the first time slot in time or the last time slot in time) or a specific number of time slots (e.g., time slots configured by the BS) may be configured as actual 480 kHz RACH time slots and / or 960 kHz RACH time slots.

[0190] When the BS indicates one or more time slots, the BS may indicate the time slot number based on a specific SCS (e.g., a 480kHz SCS). The UE may use the value indicated for another SCS by scaling it by the SCS ratio. As an example, the BS may configure time slot indices a and b based on the 480kHz SCS. In this case, when the actual SCS used for RACH is 960kHz, the UE may configure x2 (or x2+1), where x represents each time slot index, and use time slot indices 2a (or 2a+1) and 2b (or 2b+1) as RACH time slots. Here, +1 is added to select the latter time slot between time slots facing each other.

[0191] For example, when the BS indicates Figure 14 In the illustrated PRACH configuration index 17, the 120 kHz time slots corresponding to 60 kHz reference time slots 9, 19, 29, and 39 (e.g., time slots 18, 19, 38, 39, 58, 59, 78, 79) are RACH time slot candidates. Because the "number of PRACH time slots within a 60 kHz time slot" is set to 2, the 120 kHz time slots corresponding to 60 kHz reference time slots 9, 19, 29, and 39 (e.g., time slots 18, 19, 38, 39, 58, 59, 78, 79) are all configured as RACH time slots.

[0192] The number of 480kHz slots or 960kHz slots corresponding to the 120kHz slots configured as RACH slots may be four or eight per 120kHz slot. Figure 14 In the example of , one or more time slots may be used as RACH time slots.

[0193] Figure 15 An example is shown in which the first slot among the 480 kHz slot and / or the 960 kHz slot corresponding to the configured 120 kHz RACH slot is used as the RACH slot. Figure 16 An example is shown in which the last slot among the 480 kHz slot and / or the 960 kHz slot corresponding to the configured 120 kHz RACH slot is used as the RACH slot.

[0194] Figure 17 An example is shown in which a slot in a configured slot index among a 480 kHz slot and / or a 960 kHz slot corresponding to a configured 120 kHz RACH slot is used as a RACH slot. Figure 17An example in which slot indices 8N+1, 8N+3, 8N+5, and 8N+7 are configured as RACH slots based on 480 kHz SCS and an example in which slot indices 16N+3, 16N+7, 16N+11, and 16N+15 are configured as RACH slots based on 960 kHz SCS are shown. Figure 17 Differently configured slots of other indexes may be used as RACH slots.

[0195] [Method 1-B-2] All of the multiple 480 kHz time slots and / or 960 kHz time slots corresponding to the configured 120 kHz RACH time slot can be configured as 480 kHz RACH time slots and / or 960 kHz RACH time slots.

[0196] In this case, by Method 1-B-1 Figure 14 Referring to an example (eg, PRACH configuration index 17), 120 kHz slots (eg, slots 18, 19, 38, 39, 58, 59, 78, and 79) are all configured as RACH slots.

[0197] The number of 480kHz slots or 960kHz slots corresponding to the 120kHz slots configured as RACH slots may be four or eight per 120kHz slot. Figure 18 In the example of , all 480 kHz time slots or 960 kHz time slots corresponding to 120 kHz time slots may be used as RACH time slots.

[0198] [Method 1-B-3] 80 time slots (i.e., radio frames) can be configured to be included in one radio frame, which includes the configured 120 kHz RACH time slots and normal time slots (time slots that are not RACH time slots). The RACH time slots can be configured by repeating the configured 120 kHz radio frame four times within a period of 320 time slots in a 480 kHz radio frame. The RACH time slots can be configured by repeating the configured 120 kHz radio frame eight times within a period of 640 time slots in a 960 kHz radio frame.

[0199] Method 1-B-3 differs from methods 1-B-1 and 1-B-2 in that a time slot corresponding to a 120 kHz RACH time slot is not selected, but rather a time slot configuration is established by repeating 80 time slots for 120 kHz 4 times at 480 kHz and / or 8 times at 960 kHz.

[0200] For example, when the slot indices {a, b, ..., x} among the 80 slots constituting a radio frame based on 120 kHz SCS are configured as RACH slots, the slot indices {a, b, ..., x, ..., 80+a, 80+b, ..., 80+x, ..., 160+a, 160+b, ..., 160+x, ..., 240+a, 240+b, ..., 240+x} among the 320 slots constituting a radio frame based on 480 kHz SCS are configured as RACH slots (i.e., the RACH slot pattern of 480 kHz SCS or 120 kHz SCS is repeated 4 times).

[0201] As another example, when the slot indices {a, b, . . . , x} among 80 slots constituting a radio frame based on a 120 kHz SCS are configured as RACH slots, the slot indices {a, b, . . . , x, . . . , 80+a, 80+b, . . . , 80+x, . . . , 160+a, 160+b, . . . , 160+x, . . . , 240+a, 240+b, . . . , 240+x, . . . , 320+a, 320+b, . . . , 320+x, . . . , 400+a, 400+b, . . . , 400+x, . . . , 480+a, 480+b, . . . , 480+x, . . . , 560+a, 560+b, . . . , 560+x} among 640 slots constituting a radio frame based on a 960 kHz SCS are configured as RACH slots (i.e., 960 kHz The RACH slot pattern of SCS or 120kHz SCS is repeated 8 times).

[0202] According to Method 1-B-3, a RACH slot configuration may be established for a 480 or 960 kHz SCS based on a conventional configuration method by adding an operation of repeating a RACH slot pattern, without requiring the BS to signal additional information for UE operation.

[0203] [Proposed method 1-C: Configure 60 kHz as the reference SCS, and upon receiving the configuration of a 120 kHz RACH slot (or setting 120 kHz as the reference SCS), configure the RO position of the 480 / 960 kHz RACH slot according to the position of the RO mapped to the 120 kHz RACH slot]

[0204] The BS may set 60 kHz as the reference SCS and configure a 120 kHz RACH slot, or may set 120 kHz as the reference SCS and configure a 120 kHz RACH slot. Based on the RACH configuration established / indicated by the BS, the RO for the UE may be mapped to the corresponding RACH slot. 4*X (or 8*X) OFDM symbols using a 480 / 960 kHz SCS corresponding to the X-OFDM symbols occupied by the RO for the 120 kHz SCS may be a candidate for the RO location.

[0205] For example, when the BS indicates that the PRACH configuration index is 17, Figure 14 As shown, RACH slots can be configured in 60kHz reference slot indices 9, 19, 29, and 39. In terms of 120kHz, RACH slots can be configured in slot indices 18, 19, 38, 39, 58, 59, 78, and 79 (because the number of PRACH slots in a 60kHz slot is 2). An example of the mapping of RO to 120kHz reference slot index N is shown in Figure 19 is shown in .

[0206] In this case, the OFDM symbols of the 480 / 960 kHz SCS corresponding to the OFDM symbols occupied by the RO for the 120 kHz SCS may be candidates for the RO position.

[0207] As an example, a method that can align the starting OFDM symbol of the RO can be used. Figure 19 An example showing RO mapping for 480 / 960kHz is shown in Figure 20 Reference Figure 20 , among OFDM symbols to which 480 / 960 kHz SCS is applied corresponding to OFDM symbols occupied by an RO to which 120 kHz SCS is applied, OFDM symbols corresponding to a PRACH duration starting from a first OFDM symbol may be mapped to the RO.

[0208] As a second example, among OFDM symbols to which 480 / 960 kHz SCS is applied corresponding to OFDM symbols occupied by ROs to which 120 kHz SCS is applied, the last OFDM symbol boundary of the ROs (ie, the point where the OFDM symbols end) may be aligned. Figure 19 An example showing RO mapping for 480 / 960kHz is shown in Figure 21 Reference Figure 21, among OFDM symbols applying 480 / 960 kHz SCS corresponding to OFDM symbols occupied by RO applying 120 kHz SCS, RO mapping may start from an OFDM symbol preceding the last OFDM symbol PRACH duration so that OFDM symbols up to the last OFDM symbol may be mapped to RO.

[0209] As in Method 1-C, when ROs of different SCSs are aligned with OFDM symbol boundaries at specific predefined locations, the changed operation can be simplified compared to existing RO mapping methods, and thus UE complexity can be reduced. That is, methods such as "aligning the starting symbol boundary of an RO of a 480 / 960 kHz SCS with the starting symbol boundary of an RO of a 120 kHz SCS" or "aligning the ending symbol boundary of an RO of a 480 / 960 kHz SCS with the ending symbol boundary of an RO of a 120 kHz SCS" can be considered.

[0210] The BS may configure and / or indicate a specific OFDM symbol among the 4*X (or 8*X) OFDM symbols to which a 480 (or 960) kHz SCS is applied, corresponding to the X OFDM symbols occupied by the RO to which a 120 kHz SCS is applied, as the starting point of RO mapping. Alternatively, the BS may configure and / or indicate that RO mapping starts from one of 4 (or 8) OFDM symbols among the 4*X (or 8*X) OFDM symbols to which a 480 (or 960) kHz SCS is applied, corresponding to the X OFDM symbols occupied by the RO to which a 120 kHz SCS is applied (considering that each RO occupies X OFDM symbols, an interval of X OFDM symbols is used).

[0211] When the UE maps the RO, starting at a specific OFDM symbol position indicated by the BS, it can be expected that the mapped RO will not be outside the OFDM symbols applying 480 (or 960) kHz corresponding to the OFDM symbols occupied by the RO for 120 kHz SCS.

[0212] For example, for 480kHz SCS, the BS may indicate one of {0, 1, ..., 4*XX}, and for 960kHz, the BS may indicate one of {0, 1, ..., 8*XX}. The UE may expect one of {0, 1, ..., 4*XX} to be indicated for 480kHz SCS and one of {0, 1, ..., 8*XX} to be indicated for 960kHz.

[0213] Alternatively, for 480kHz SCS, the BS may indicate one of {0, X, 2*X, ..., 4*XX}, and for 960kHz, may indicate one of {0, X, 2*X, ..., 8*XX}. The UE may expect that one of {0, X, 2*X, ..., 4*XX} is indicated for 480kHz SCS and one of {0, X, 2*X, ..., 8*XX} is indicated for 960kHz.

[0214] More specifically, when the PRACH duration of the 120kHz SCS is 2 OFDM symbols, in the case of the 480kHz SCS, 8 OFDM symbols corresponding to the 2 OFDM symbols may be candidates for RO, and in the case of the 960kHz SCS, 16 OFDM symbols corresponding to the 2 OFDM symbols may be candidates for RO. Because the PRACH duration is 2 OFDM symbols, for the 480kHz SCS, the BS may indicate one of {0, 1, ..., 6}, and for 960kHz, may indicate one of {0, 1, ..., 14}. The UE may expect one of {0, 1, ..., 6} to be indicated for the 480kHz SCS and one of {0, 1, ..., 14} to be indicated for the 960kHz.

[0215] Alternatively, for 480kHz SCS, the BS may indicate one of {0, 2, 4, 6} and for 960kHz, may indicate one of {0, 2, 4, ..., 14} (considering that each RO may occupy 2 OFDM symbols, the interval is 2 OFDM). The UE may expect that one of {0, 2, 4, 6} is indicated for 480kHz SCS and one of {0, 2, 4, ..., 14} is indicated for 960kHz.

[0216] Specifically, the symbol-level index mentioned in Method 1-C is not an OFDM symbol index within the actual time slot of the 480 / 960 kHz SCS, and corresponds to a temporal index from 0 to 4*X-1 for 4*X OFDM symbols to which the 480 kHz SCS is applied, corresponding to X OFDM symbols occupied by the RO to which the 120 kHz SCS is applied. Alternatively, it corresponds to a temporal index from 0 to 8*X-1 for 8*X OFDM symbols to which the 960 kHz SCS is applied, corresponding to X OFDM symbols occupied by the RO to which the 120 kHz SCS is applied.

[0217] Equation 2 below is a conventional equation for deriving RA-RNTI.

[0218] [Equation 2]

[0219] RA-RNTI = 1 + s_id + 14t_id + 14*80*f_id + 14*80*8*ul_(carrier-id)

[0220] Here, * represents a multiplication operation. s_id represents the starting symbol index occupied by the RO on which the UE has sent the PRACH preamble. t_id represents the index of the time slot to which the RO on which the UE has sent the PRACH preamble belongs.

[0221] When the position of the RO for a higher SCS (e.g., 480 / 960 kHz) is configured and / or indicated within the OFDM symbol duration of the RO occupied by the reference SCS (e.g., 120 kHz), the RA-RNTI can be derived based on Equation 2 by allowing the UE and BS to reinterpret the starting symbol index and the slot index based on the reference SCS (e.g., 120 kHz) instead of the higher SCS (e.g., 480 / 960 kHz). The UE and BS that need to calculate the RA-RNTI can reinterpret s_id and t_id, which are parameters used to derive the RA-RNTI based on the reference SCS (e.g., 120 kHz), even if the SCS of the RO that actually transmits / receives the PRACH preamble is configured as a higher SCS (e.g., 480 / 960 kHz). In other words, the values ​​of s_id and t_id used for deriving the RA-RNTI can be values ​​based on the reference SCS instead of the SCS actually used for transmitting the PRACH preamble.

[0222] For example, reference Figure 20 For RO1 in 480kHz SCS, the actual starting symbol index and time slot index of RO1 are s_id=0 and t_id=4N respectively. The starting symbol index and symbol index of RO1 reinterpreted based on 120kHz SCS (to be used for RA-RNTI derivation) are s_id=0 and t_id=N respectively. Similarly, in 960kHz SCS, the actual starting symbol index and time slot index of RO1 are s_id=0 and t_id=8N respectively, but the starting symbol index and time slot index of RO1 reinterpreted based on 120kHz SCS (to be used for RA-RNTI derivation) are s_id=0 and t_id=N respectively.

[0223] As another example, for Figure 21For RO4 in 480kHz SCS, the actual starting symbol index and time slot index of RO4 are s_id=2 and t_id=4N+2 respectively. The starting symbol index and time slot index of RO4 reinterpreted based on 120kHz SCS (to be used for RA-RNTI derivation) are s_id=6 and t_id=N respectively. Similarly, in 960kHz SCS, the actual starting symbol index and time slot index of RO4 are s_id=6 and t_id=8N+4 respectively. The starting symbol index and time slot index of RO4 reinterpreted based on 120kHz SCS (to be used for RA-RNTI derivation) are s_id=6 and t_id=N respectively.

[0224] Furthermore, according to the proposed method 1-C, when a timing gap is required between ROs, a timing gap naturally exists between ROs even if the BS does not otherwise indicate an explicit timing gap. Therefore, the proposed method 1-C can be used when the BS needs to configure / indicate a timing gap between ROs.

[0225] In other words, when the BS configures / instructs the use of inter-RO timing gaps, the proposed method 1-C can be used. When the BS configures / instructs that the use of inter-RO timing gaps is not allowed (or does not configure inter-RO timing gaps), another proposed method (e.g., proposed method 1, 1-A, or 1-B) can be used, by which ROs can be continuously mapped without time gaps.

[0226] Alternatively, two different RO mapping methods may be used together. For example, an RO mapping method such as the proposed method 1-C, in which a timing gap between ROs naturally exists, may be used as one mapping type (e.g., RO mapping type 0), and an RO mapping method such as the proposed methods 1, 1-A, or 1-B, in which a timing gap between ROs does not exist, may be used as another mapping type (e.g., RO mapping type 1). When it is necessary to use an inter-RO timing gap, the BS may configure / indicate RO mapping type 0. When it is not necessary to use an inter-RO timing gap, the BS may configure / indicate RO mapping type 1.

[0227] Alternatively, in the case of introducing an explicit parameter for configuring the timing gap between ROs to be used (or indicating the timing gap between ROs by an implicit method), when the BS indicates the presence of a timing gap between ROs by the explicit parameter (or implicit method), RO mapping type 0 can be used on this basis. Conversely, when the BS indicates the absence of a timing gap between ROs by the explicit parameter (or implicit method) (or when the explicit parameter is not sent to the UE), RO mapping type 1 can be used.

[0228] Alternatively, in the case where there is an explicit parameter indicating whether to perform the LBT procedure for the RACH procedure (or an implicit method is used to indicate whether to perform the LBT procedure), when the BS indicates through the explicit parameter (or implicit method) that the LBT procedure for the RACH procedure is to be performed, RO mapping type 0 can be used (because a timing gap is required between ROs in this case). When the BS indicates through the explicit parameter (or implicit method) that the LBT procedure for the RACH procedure is not to be performed (or does not send the explicit parameter to the UE), RO mapping type 1 can be used (because a timing gap is not required between ROs).

[0229] [Proposed Method 2: Define a new reference SCS for FR4 and define a RACH timeslot calculation method for the new SCS value based on the traditional RACH timeslot calculation method]

[0230] When defining an SCS to be used for FR4, one of the SCSs can be defined as a reference SCS. For example, when a 240kHz SCS is configured as the reference SCS for FR4, the RACH slots can be determined in 60kHz and 120kHz SCSs by the method defined for FR2. In addition, a new PRACH configuration table can be defined based on the 240kHz SCS (or a method of reinterpreting the legacy PRACH configuration table). The method of calculating the PRACH transmission timing for 480kHz and 960kHz SCSs can be the same as Figure 11 The method is configured similarly (the conventional method consisting of 60kHz SCS and 120kHz SCS).

[0231] First, considering a new PRACH configuration table (or a method of reinterpreting a legacy PRACH configuration table), the "time slot number" field in the legacy PRACH configuration table can be replaced with a new value, or can be reinterpreted as k times the existing value (for example, when 240kHz SCS is configured as the reference SCS, k=240 / 60=4).

[0232] For example, when the PRACH configuration index is 70, Figure 22 As shown in , the 60kHz SCS reference slot numbers are 19 and 39. Since k is 4, the slot numbers in the 240kHz SCS can be 19*4=76 and 39*4=156. Therefore, based on the 240kHz SCS, slot 76 and slot 156 can be selected as RACH slots.

[0233] In addition, when k times the slot index is set, the PRACH transmission opportunity is mapped to the first slot among the slots corresponding to the 60kHz SCS reference slot. Alternatively, after setting the k times the slot index, as many additional slots as m slots may be configured, where m∈{0,1,...,k-1}. When m is 0, the first slot among the 240kHz SCS reference slots corresponding to the 60kHz SCS reference slot may be configured as a RACH slot. When m is k-1, the last slot among the 240kHz SCS reference slots corresponding to the 60kHz SCS reference slot may be configured as a RACH slot. According to Figure 22 For example, when m is 0, the time slots with indices 19*4=76 and 39*4=156 become RACH time slots. When m is 1, the time slots with indices 19*4+1=77 and 39*4+1=157 become RACH time slots. When m is 2, the time slots with indices 19*4+2=78 and 39*4+2=158 become RACH time slots. When m is 3, the time slots with indices 19*4+3=79 and 39*4+3=159 become RACH time slots.

[0234] An additional time slot configuration value of m can be predefined so that it can be pre-identified by the UE and the BS. In addition, the UE and the BS can pre-store the configuration of the value of m. Alternatively, the BS can indicate to the UE through higher layer signaling (e.g., SIB or dedicated RRC signaling). For example, the default value of m can be 0, and the BS can set one of the values ​​1 to k-1 as the value of m to the UE. Specifically, the same m value can be indicated in the first time slot and the second time slot, or different m values ​​can be set in the first time slot and the second time slot respectively. The m value for the first time slot can be indicated by the BS, and the m value for the second time slot can be set according to a preconfigured rule (e.g., (m+1) mod k, or (m-1) mod k). Alternatively, the m value for the second time slot can be indicated by the BS, and the m value for the first time slot can be set according to a preconfigured rule (e.g., (m+1) mod k, or (m-1) mod k).

[0235] Figures 23 to 26 An example of a RACH slot configured by Method 2 is shown. These figures show an example of extending from a 60 kHz SCS to a 240 kHz SCS when k=4 and m is 0, 1, 2, and 3, respectively.

[0236] In addition, when 240kHz SCS is configured as the reference SCS, Figure 11The method (ie, configuring a PRACH transmission opportunity of 120kHz SCS for 60kHz SCS) can be reinterpreted by the UE for 480kHz SCS. For 960kHz SCS, other methods proposed in this document (eg, methods 1 to 3 proposed) can be used.

[0237] With method 2, only a slight modification or a method of reinterpreting the existing FR2 configuration PRACH configuration table and the equations for PRACH transmission timing is required.

[0238] [Proposed Method 3: Increase the density of PRACH transmission opportunities for SCS for FR4]

[0239] In the case of 60kHz SCS, a PRACH transmission opportunity may occur in a single time slot. In the case of 120kHz SCS, a PRACH transmission opportunity may occur in up to two time slots. Therefore, for 240kHz SCS, 480kHz SCS, and 960kHz SCS, PRACH transmission opportunities can be configured in up to 4, 8, and 16 time slots.

[0240] [Option 3-1] Configure the density of PRACH transmission opportunities to maximize utilization

[0241] For example, in the case of 240kHz SCS, up to four configuration methods can be considered. That is, because up to four 240kHz SCS time slots can exist in a single time slot duration of 60kHz SCS, a configuration method using one time slot to four time slots as PRACH transmission opportunities can be used. The BS can indicate one of the four configuration methods to the UE (for example, the previously defined parameter "PRACH time slot number within a 60kHz time slot" can be indicated as one of 1 to 4), and the UE can configure the PRACH transmission opportunity according to the indicated time slot number and then send the PRACH preamble. For example, when the number of time slots indicated to the UE is 3, 3 time slots up to the last time slot (or 3 time slots starting from the first time slot) can be used for PRACH transmission opportunities.

[0242] An example of option 3-1 is Figure 27 Shown in. Figure 27 An exemplary case is shown indicating that PRACH transmission opportunities are to be configured in three slots up to the last slot in the 240 kHz SCS.

[0243] In addition, in the case of 480kHz SCS, up to 8 configuration methods can be used. In the case of 960kHz SCS, up to 16 configuration methods can be used.

[0244] [Option 3-2] Increase the density of PRACH transmission opportunities, but keep both configuration methods (i.e., use a proportionally increased number of slots)

[0245] For example, in the case of a 240kHz SCS, up to four 240kHz SCS time slots may exist in a single time slot duration of a 60kHz SCS, and therefore a configuration method using one to four time slots as PRACH transmission opportunities may be used. In this case, the UE and the BS may be preconfigured to use two preselected configuration methods from among the four configuration methods, and the BS may indicate these two configuration methods to the UE (for example, the previously defined parameter "number of PRACH time slots within a 60kHz time slot" may indicate one of two preselected numbers from 1 to 4). In addition, the above two configuration methods may not be preselected. Instead, the BS may indicate them to the UE through higher layer signaling (for example, SIB or dedicated RRC signaling).

[0246] Thereafter, the UE may configure a PRACH transmission opportunity according to the indicated number of slots and then transmit a PRACH preamble. For example, when the preselected number of slots is 2 or 4, and the number of slots indicated to the UE is 2, the two slots up to the last slot (or the two slots starting from the first slot) may be used for PRACH transmission opportunities.

[0247] An example of option 3-2 is in Figure 28 and 29 Shown in. Figure 28 and 29 Indicates two configuration methods for setting to two or four. Figure 28 The figure shows a case where the PRACH transmission opportunities are indicated as being allocated in a total of two slots up to the last slot in the 240 kHz SCS. Figure 29 The figure shows a case where PRACH transmission opportunities are indicated as being allocated in a total of 4 slots up to the last slot in a 240 kHz SCS.

[0248] In addition, in the case of 480 kHz SCS, two of a maximum of eight configuration methods can be used. In the case of 960 kHz SCS, two of a maximum of 16 configuration methods can be used.

[0249] [Option 3-3] The density and configuration method of PRACH transmission opportunities are configured by the BS

[0250] In short, the BS can indicate N configuration methods and even the number of time slots indicated by each of the N configuration methods through higher layer signaling (e.g., SIB or dedicated RRC signaling). For example, when N=2, there are a total of two configuration methods. The first configuration method (configuration method 3-3-1) is to configure the PRACH transmission timing in X (continuous) time slots, and the second configuration method (configuration method 3-3-2) is to configure the PRACH transmission timing in Y (continuous) time slots. Specifically, as many consecutive time slots as the number of time slots corresponding to X and Y (until the back end) can be configured as PRACH transmission timings. Alternatively, X or Y time slots can be consecutive time slots, but the BS can indicate a set of time slots with Z time slot gaps between time slots (e.g., the previously defined parameter "number of PRACH time slots within a 60kHz time slot" can be set to X and Y, and then X time slots or Y time slots until the back end can be selected among the time slots overlapping the 60kHz reference time slot).

[0251] An example of option 3-3 is in Figure 30 is shown in . Figure 30 Shows the case where PRACH transmission opportunities are indicated as being configured in a total of X and Y slots up to the last slot in a 240kHz SCS (e.g., X=1, Y=3)

[0252] It has been proposed that the position of the RACH slot corresponds to a specific number of slots until the end (as consecutive slots or with Z slot gaps in between). The position of the RACH slot can be configured in a method other than the method of configuring a specific number of slots until the end. For example, when N=2, the PRACH transmission opportunity can be configured in X slots until the last slot according to the specific number (e.g., X) used for configuration method 3-3-1, and then the PRACH transmission opportunity can be configured in Y slots starting from the slot before X slots according to the specific number (e.g., Y) used for configuration method 3-3-2. With this configuration, X slots until the last slot and Y slots thereafter can be used for PRACH transmission opportunities.

[0253] This configuration can be represented as Figure 31 As shown in . Figure 31 A case is shown in which it is indicated that PRACH transmission opportunities are to be configured in a total of X slots up to the last slot in the 240 kHz SCS and in Y slots (eg, X=1, Y=3) starting from the next slot before X slots.

[0254] As another example, when N=2, as many X time slots as a specific number (e.g., X) used for configuration method 3-3-1 up to the last time slot can be used for PRACH transmission opportunities, and as many Y time slots as a specific number (e.g., Y) used for configuration method 3-3-2 up to the last time slot in which the 60kHz SCS reference time slot is divided into two halves can be used for PRACH transmission opportunities.

[0255] This configuration can be represented as Figure 32 As shown in . Figure 32 A case is shown indicating that PRACH transmission opportunities are configured in X slots up to the last slot in 240kHz SCS, and in Y slots up to the last slot in which a 60kHz SCS reference slot is divided into two halves (e.g., X=1, Y=2).

[0256] In addition, when the time slot groups corresponding to the respective configuration methods are not defined because they overlap in time, as described above, a configuration method for selecting two time slot groups can be added. As an example, when N=3, as many X time slots as the specific number (e.g., X) used for configuration method 3-3-1 up to the last time slot can be used for PRACH transmission opportunities, and as many Y time slots as the specific number (e.g., Y) used for configuration method 3-3-2 starting from the time slot after X time slots are configured for PRACH transmission opportunities. Finally, as a third configuration method (configuration method 3-3-3), time slots corresponding to both X and Y can be configured for PRACH transmission opportunities.

[0257] The above-proposed methods may be used alone, or two or more proposed methods may be used in combination.

[0258] In addition, the examples of the above-mentioned proposed methods may also be included as one of the implementation methods of the present disclosure, and it is therefore apparent that they can be regarded as a proposed method. In addition, the above-mentioned proposed methods can be implemented independently, or can be implemented by combining (or merging) some of the proposed methods. Rules can be defined so that the BS can provide information about whether to apply the proposed method (or information about the rules of the proposed method) to the UE through a predefined signal (e.g., a physical layer signal or a higher layer signal). For example, the higher layer may include one or more of the functional layers such as MAC, RLC, PDCP, RRC, SDAP.

[0259] Implementation Method

[0260] The embodiments may be implemented by organically combining one or more of the above operations.

[0261] One of the embodiments that can be implemented by a combination of the above operations can be configured as Figure 33 As shown in .

[0262] The UE may transmit a PRACH (S3301) and receive a RAR corresponding to the PRACH (S3303). Although not shown, the BS may receive the PRACH and transmit a RAR corresponding to the PRACH.

[0263] The PRACH transmission timing for PRACH transmission may be determined through a combination of one or more operations described in the proposed methods 1 to 3.

[0264] For example, according to the proposed method 1, when the PRACH is transmitted based on one of the 480kHz SCS and the 960kHz SCS, the value of the PRACH slot used as the input value of Equation 1 can be reinterpreted as the first slot and the second slot, instead of Figure 11 The 0s and 1s in .

[0265] Specifically, referring to the proposed method 1 and Figure 11 , when PRACH is transmitted based on one of 480kHz SCS and 960kHz SCS, 60kHz SCS is used for a reference slot (because of the number of PRACH slots within a 60kHz slot).

[0266] According to the proposed method 1, based on one of the 480kHz SCS and the 960kHz SCS used for the time slot in which the PRACH is transmitted, when the PRACH time slot number in the reference time slot is 1 (the PRACH time slot number in the 60kHz time slot is equal to 1), the value 1 for the PRACH time slot can be reinterpreted as a second time slot value b. In the proposed method 1, the second time slot value b corresponds to the maximum value from 0 to N-1. Therefore, b corresponds to 7 in the 480kHz SCS and corresponds to 15 in the 960kHz SCS.

[0267] Based on one of the 480kHz SCS and the 960kHz SCS used for the time slot in which the PRACH is transmitted, when the number of PRACH time slots in the reference time slot is not 1 (otherwise, or the number is 2), 0 between 0 and 1 as the value for the PRACH time slot may be reinterpreted as the first time slot value a, and 1 may be reinterpreted as the second time slot value b. In the proposed method 1, the second time slot value b is the maximum value from 0 to N-1. Therefore, b corresponds to 7 in the 480kHz SCS and 15 in the 960kHz SCS. In the proposed method 1, when the first time slot value a is N / 2-1, b corresponds to 3 in the 480kHz SCS and corresponds to 7 in the 960kHz SCS. The method presented considering that the first time slot value a is N / 2-1 Figure 11 The modified example is in Figure 34 In the proposed method 1, when the first time slot value a is N-2, b corresponds to 6 in 480kHz SCS and corresponds to 14 in 960kHz SCS. Figure 11 The modified example is in Figure 35 Shown in.

[0268] In other words, according to the proposed method 1, based on the PRACH transmitted in one or two PRACH slots using one of the 480kHz SCS and the 960kHz SCS, the 60kHz SCS can be used as the reference SCS for determining the PRACH slot. Therefore, one or two PRACH slots are determined among the N slots corresponding to the 60kHz reference slot. Since N is determined based on the ratio between the SCSs, N=8 for the 480kHz SCS and N=16 for the 960kHz SCS.

[0269] Refer to the proposed method 1 and Figure 12 、 Figure 13 、 Figure 34 and Figure 35 , based on the number of PRACH slots in the reference slot being 1, 1 PRACH slot is used and the value for the PRACH slot is N-1. Additionally, based on the number of PRACH slots in the slot not being 1, two PRACH slots are used and the values ​​for the PRACH slot may be N / 2-1 and N-1. Additionally, based on the number of PRACH slots in the slot not being 1, two PRACH slots are used and the values ​​for the PRACH slot may be N-2 and N-1.

[0270] In addition to the above Figure 33 In addition to the operation, refer to Figures 1 to 32 One or more of the operations described in Section 2 and / or the operations described in Section 3 may be combined and performed additionally.

[0271] Examples of communication systems to which the present disclosure is applied

[0272] The various descriptions, functions, processes, proposals, methods and / or operational flowcharts of the present disclosure described herein may be applied to (but not limited to) various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0273] More specific examples will be described below with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise specified, similar reference numerals represent identical or corresponding hardware blocks, software blocks, or functional blocks.

[0274] Figure 36 A communication system 1 applied to the present disclosure is shown.

[0275] refer to Figure 36 , the communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. The wireless device is a device that performs communication using a radio access technology (RAT) (e.g., 5G NR (or new RAT) or LTE), also known as a communication / radio / 5G device. The wireless device may include (but is not limited to) a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an IoT device 100f, and an artificial intelligence (AI) device / server 400. For example, the vehicle may include a vehicle with wireless communication capabilities, an autonomous vehicle, and a vehicle capable of vehicle-to-vehicle (V2V) communication. In this article, the vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television (TV), a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc. Handheld devices may include smartphones, smartpads, wearable devices (e.g., smartwatches or smart glasses), and computers (e.g., laptops). Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node for other wireless devices.

[0276] Wireless devices 100a to 100f can be connected to a network 300 via a BS 200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can be connected to an AI server 400 via the network 300. The network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although wireless devices 100a to 100f can communicate with each other via the BS 200 / network 300, wireless devices 100a to 100f can perform direct communication with each other (e.g., sidelink communication) without the intervention of the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., V2V / Vehicle-to-Everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0277] Wireless communications / connections 150a, 150b, and 150c may be established between wireless devices 100a to 100f and between BSs 200, as well as between BSs 200. Here, wireless communications / connections may be established via various RATs (e.g., 5G NR), such as UL / DL communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay or integrated access backhaul (IAB)). Wireless signals may be transmitted and received between wireless devices, between wireless devices and BSs, and between BSs via the wireless communications / connections 150a, 150b, and 150c. For example, signals may be transmitted and received via various physical channels via the wireless communications / connections 150a, 150b, and 150c. To this end, at least a portion of various configuration information for configuring processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes may be performed based on various proposals of the present disclosure.

[0278] Examples of wireless devices to which the present disclosure is applied

[0279] Figure 37 A wireless device suitable for use with the present disclosure is shown.

[0280] refer to Figure 37 , the first wireless device 100 and the second wireless device 200 can transmit wireless signals through various RATs (e.g., LTE and NR). {The first wireless device 100 and the second wireless device 200} may correspond to Figure 36 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0281] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may also include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate first information / signals, and then transmit a wireless signal including the first information / signals through the transceiver 106. The processor 102 may receive a wireless signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for executing all or part of the processing controlled by the processor 102 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. The processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive wireless signals via one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may be a communication modem / circuit / chip.

[0282] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may also include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206 and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor 202 may process information in the memory 204 to generate third information / signals, and then transmit a wireless signal including the third information / signals through the transceiver 206. The processor 202 may receive a wireless signal including fourth information / signals through the transceiver 106, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202 and store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing all or part of the processing controlled by the processor 202 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. The processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive wireless signals via one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may be a communication modem / circuit / chip.

[0283] The hardware elements of the wireless devices 100 and 200 will now be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as physical (PHY), medium access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), RRC, and service data adaptation protocol (SDAP)). The one or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein. The one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein and provide the messages, control information, data, or information to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, and provide the generated signal to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document.

[0284] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be included in one or more processors 102 and 202 or may be stored in one or more memories 104 and 204 and driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flow charts disclosed in this document may be implemented in the form of codes, instructions and / or instruction sets using firmware or software.

[0285] One or more memories 104 and 204 can be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 104 and 204 can be configured to include read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, cache memory, computer-readable storage media and / or combinations thereof. One or more memories 104 and 204 can be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 can be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0286] One or more transceivers 106 and 206 can transmit user data, control information, and / or wireless signals / channels mentioned in the methods and / or operational flowcharts of this document to one or more other devices. One or more transceivers 106 and 206 can receive user data, control information, and / or wireless signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 can be connected to one or more processors 102 and 202 and transmit and receive wireless signals. For example, one or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can transmit user data, control information, or wireless signals to one or more other devices. One or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can receive user data, control information, or wireless signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received wireless signals / channels from RF band signals to baseband signals so that the received user data, control information, and wireless signals / channels may be processed using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, and wireless signals / channels processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0287] Example of use of a wireless device to which the present disclosure is applied

[0288] Figure 38 Another example of a wireless device applicable to the present disclosure is shown. The wireless device can be used according to the use case / service (refer to Figure 36 ) are implemented in various forms.

[0289] refer to Figure 38 , the wireless devices 100 and 200 may correspond to Figure 37The wireless devices 100 and 200 may be configured to include various elements, components, units / portions and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit 110 may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Figure 37 The one or more processors 102 and 202 and / or the one or more memories 104 and 204 of the present invention may include: Figure 37 The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and provides overall control of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on the program / code / instructions / information stored in the memory unit 130. The control unit 120 can transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0290] The additional component 140 may be configured in various ways depending on the type of wireless device. For example, the additional component 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in the manner of, but not limited to, a robot ( Figure 36 100a), vehicles ( Figure 36 100b-1 and 100b-2), XR devices ( Figure 36 100c), handheld device ( Figure 36 100d), household appliances ( Figure 36 100e), IoT devices ( Figure 36 100f), digital broadcasting terminal, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 36 400), BS( Figure 36 200), network nodes, etc. Depending on the use case / service, the wireless device can be mobile or fixed.

[0291] exist Figure 38In the wireless devices 100 and 200, the various elements, components, units / portions, and / or modules may all be connected to each other via a wired interface, or at least a portion thereof may be wirelessly connected via the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected via the communication unit 110. The various elements, components, units / portions, and / or modules in the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured using a collection of one or more processors. For example, the control unit 120 may be configured using a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, and a memory control processor. In another example, the memory 130 may be configured using RAM, dynamic RAM (DRAM), ROM, flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0292] Examples of vehicles or autonomous driving vehicles to which the present disclosure is applied

[0293] Figure 39 A vehicle or autonomous driving vehicle applicable to the present disclosure is shown. The vehicle or autonomous driving vehicle can be implemented as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0294] refer to Figure 39 , the vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Figure 38 Blocks 110 / 130 / 140.

[0295] The communication unit 110 can send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, base stations (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling components of the vehicle or autonomous vehicle 100. The control unit 120 may include an ECU. The drive unit 140a enables the vehicle or autonomous vehicle 100 to travel on a road. The drive unit 140a may include an engine, a motor, a power system, wheels, brakes, a steering system, etc. The power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and may include wired / wireless charging circuits, a battery, etc. The sensor unit 140c can acquire information regarding vehicle status, surrounding environment information, user information, etc. The sensor unit 140 c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a location module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140 d may implement a technology for maintaining the lane in which the vehicle is traveling, a technology for automatically adjusting the speed (e.g., adaptive cruise control), a technology for autonomously traveling along a determined path, a technology for traveling by automatically setting a route if a destination is set, etc.

[0296] For example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving route and driving plan based on the obtained data. The control unit 120 can control the drive unit 140a so that the vehicle or autonomous driving vehicle 100 moves along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 can aperiodically / periodically obtain recent traffic information data from the external server and obtain surrounding traffic information data from neighboring vehicles. During autonomous driving, the sensor unit 140c can obtain information about the vehicle status and / or surrounding environment information. The autonomous driving unit 140d can update the autonomous driving route and driving plan based on the newly obtained data / information. The communication unit 110 can transmit information about the vehicle's location, autonomous driving route, and / or driving plan to the external server. The external server can use AI technology to predict traffic information data based on information collected from the vehicle or autonomous driving vehicle and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0297] Those skilled in the art will understand that, without departing from the spirit and essential characteristics of the present disclosure, the present disclosure may be implemented in other specific ways than those described herein. Therefore, the above embodiments are to be interpreted in all respects as illustrative and not restrictive. The scope of the present disclosure should be determined by the appended claims and their legal equivalents (rather than the above description), and all changes that come within the meaning and equivalent range of the appended claims are intended to be encompassed therein.

[0298] Industrial Applicability

[0299] As described above, the present disclosure is applicable to various wireless communication systems.

Claims

1. A method for transmitting and receiving signals by a user equipment (UE) operating in a wireless communication system, the method comprising: Sending a physical random access channel (PRACH); as well as receiving a random access response (RAR) based on the PRACH, wherein the PRACH is sent in one or two PRACH time slots, wherein the one or two PRACH time slots are determined among N time slots corresponding to the reference time slot, wherein one of a 480 kHz subcarrier spacing (SCS) and a 960 kHz SCS is used for the N time slots, and a 60 kHz SCS is used for the reference time slot, wherein the number of PRACH time slots in the reference time slot is 1, for the 480kHz SCS, the value for the one PRACH time slot is 7, and for the 960kHz SCS, the value for the one PRACH time slot is 15, The number of PRACH time slots in the reference time slot is 2, the values ​​used for the two PRACH time slots are 3 and 7 for the 480kHz SCS, and the values ​​used for the two PRACH time slots are 7 and 15 for the 960kHz SCS.

2. The method according to claim 1, wherein The PRACH is sent on an interlace.

3. The method according to claim 1, wherein The PRACH is transmitted through a shared spectrum.

4. The method according to claim 1, wherein The PRACH is transmitted in a frequency band equal to or greater than 52.6 GHz.

5. A user equipment (UE) configured to transmit and receive signals in a wireless communication system, the UE comprising: at least one transceiver; at least one processor; as well as at least one memory operatively connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising: transmitting a physical random access channel (PRACH); and receiving a random access response (RAR) based on the PRACH, wherein the PRACH is sent in one or two PRACH time slots, wherein the one or two PRACH time slots are determined among N time slots corresponding to the reference time slot, wherein one of a 480 kHz subcarrier spacing (SCS) and a 960 kHz SCS is used for the N time slots, and a 60 kHz SCS is used for the reference time slot, wherein the number of PRACH time slots in the reference time slot is 1, for the 480kHz SCS, the value for the one PRACH time slot is 7, and for the 960kHz SCS, the value for the one PRACH time slot is 15, The number of PRACH time slots in the reference time slot is 2, the values ​​used for the two PRACH time slots are 3 and 7 for the 480kHz SCS, and the values ​​used for the two PRACH time slots are 7 and 15 for the 960kHz SCS. The UE according to claim 5 , wherein: The PRACH is sent on an interlace.

7. The UE according to claim 5, wherein: The PRACH is transmitted through a shared spectrum.

8. The UE according to claim 5, wherein: The PRACH is transmitted in a frequency band equal to or greater than 52.6 GHz.

9. A method for transmitting and receiving signals by a base station (BS) operating in a wireless communication system, the method comprising: Receiving a physical random access channel (PRACH); as well as sending a random access response (RAR) based on the PRACH, wherein the PRACH is sent in one or two PRACH time slots, wherein the one or two PRACH time slots are determined among N time slots corresponding to the reference time slot, wherein one of a 480 kHz subcarrier spacing (SCS) and a 960 kHz SCS is used for the N time slots, and a 60 kHz SCS is used for the reference time slot, wherein the number of PRACH time slots in the reference time slot is 1, for the 480kHz SCS, the value for the one PRACH time slot is 7, and for the 960kHz SCS, the value for the one PRACH time slot is 15, The number of PRACH time slots in the reference time slot is 2, the values ​​used for the two PRACH time slots are 3 and 7 for the 480kHz SCS, and the values ​​used for the two PRACH time slots are 7 and 15 for the 960kHz SCS.

10. The method according to claim 9, wherein: The PRACH is received on an interlace.

11. The method according to claim 9, wherein The PRACH is received through a shared spectrum.

12. The method according to claim 9, wherein The PRACH is received in a frequency band equal to or greater than 52.6 GHz.

13. A base station (BS) configured to transmit and receive signals in a wireless communication system, the BS comprising: at least one transceiver; at least one processor; as well as at least one memory operatively connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising: receiving a physical random access channel (PRACH); and sending a random access response (RAR) based on the PRACH, wherein the PRACH is sent in one or two PRACH time slots, wherein the one or two PRACH time slots are determined among N time slots corresponding to the reference time slot, wherein one of a 480 kHz subcarrier spacing (SCS) and a 960 kHz SCS is used for the N time slots, and a 60 kHz SCS is used for the reference time slot, wherein the number of PRACH time slots in the reference time slot is 1, for the 480kHz SCS, the value for the one PRACH time slot is 7, and for the 960kHz SCS, the value for the one PRACH time slot is 15, The number of PRACH time slots in the reference time slot is 2, the values ​​used for the two PRACH time slots are 3 and 7 for the 480kHz SCS, and the values ​​used for the two PRACH time slots are 7 and 15 for the 960kHz SCS.

14. The BS according to claim 13, wherein: The PRACH is received on an interlace.

15. The BS according to claim 13, wherein: The PRACH is received through a shared spectrum.

16. The BS according to claim 13, wherein: The PRACH is received in a frequency band equal to or greater than 52.6 GHz.

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