Terminal, wireless communication method, and base station

Abstract

User equipment according to an aspect of the present disclosure comprises: a control unit that controls one or more random access procedures; a reception unit that, on the basis of the random access procedures, acquires some pieces of information related to a plurality of timing advances associated with the respective ones of a plurality of base stations or transmission / reception points; and a transmission unit that performs UL transmissions on the basis of at least one of the pieces of information related to the plurality of timing advances.

Description

Technical Field

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system.

Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was standardized for the purpose of further high data rates, low latency, etc. (Non-Patent Document 1). Also, for the purpose of further large capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel. 10-14) was standardized.

[0003] Successor systems to LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G+(plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also being considered.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In existing systems (e.g., before Rel.16 / before 5G), the timing of UL transmission is controlled based on Timing Advance (TA). Each UE performs timing control of UL transmission for each pre-set Timing Advance Group (TAG). Thereby, at the UL receiving side (e.g., base station), the reception timings of UL signals transmitted from different UEs can be aligned.

[0006] In future wireless communication systems (e.g., after Rel.17 / Beyond 5G / after 6G), it is also assumed to establish synchronization (e.g., UL synchronization) with multiple base stations / Transmission / Reception Points (TRPs) in order to achieve improved communication quality / improved reliability. Also, in future wireless communication systems, it is assumed that more base stations are arranged in the vicinity of the UE compared with existing systems, and it may be necessary to establish synchronization (e.g., UL synchronization) with multiple base stations / TRPs.

[0007] However, in existing systems, the control method when a terminal establishes synchronization with multiple base stations / TRPs, or the method for acquiring / controlling the timing advance corresponding to multiple base stations / TRPs, has not been sufficiently studied.

[0008] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately control UL synchronization even when a terminal performs communication using multiple base stations / TRPs.

Means for Solving the Problems

[0009] A terminal according to one aspect of the present disclosure includes a control unit that controls one or more random access procedures, a receiving unit that acquires information regarding a plurality of timing advances respectively corresponding to a plurality of base stations or transmission / reception points based on the random access procedures, and a transmitting unit that performs UL transmission based on at least one of the information regarding the plurality of timing advances. Then, based on the single random access procedure, the control unit acquires information regarding the plurality of timing advances do.

Advantages of the Invention

[0010] According to one aspect of the present disclosure, UL synchronization can be appropriately controlled even when a terminal performs communication using a plurality of base stations / TRPs.

Brief Description of the Drawings

[0011]

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DETAILED DESCRIPTION OF THE INVENTION

[0012] In an existing system (e.g., NR prior to Rel. 16), a terminal (hereinafter also referred to as UE) establishes UL synchronization with one base station. When performing UL communication with another base station, it is necessary to execute a procedure to establish UL synchronization again. Note that the establishment of UL synchronization may be to hold / adjust the timing advance (TA).

[0013] In an existing system, the transmission timing of the UL channel and / or UL signal (UL channel / signal) is adjusted by the timing advance (TA: Timing Advance). The reception timing of UL channels / signals from different UEs is adjusted on the base station side.

[0014] In future wireless communication systems (e.g., after Rel. 17 / Beyond 5G / 6G and later), further improvement in communication performance, improvement in reliability (or ensuring redundancy), diversification of use cases, etc. are assumed. To achieve such purposes, it is considered that the UE establishes UL synchronization with a plurality of base stations / TRPs (hereinafter simply referred to as base stations) assuming communication with the plurality of base stations.

[0015] Also, in future wireless communication systems, the introduction of dynamic changes in the form of cells of base stations / mobile base stations, etc. is also assumed. Instead of the cell deployment covering a plane as in the existing system, a situation where a plurality of base stations are arranged near the UE is also considered. In such a case, it is also assumed that the UE needs to establish UL synchronization with a plurality of base stations.

[0016] However, when the terminal establishes synchronization with a plurality of base stations, or when acquiring / adjusting the timing advance corresponding to a plurality of base stations, the problem becomes how to control it.

[0017] The inventors focused on cases where a UE establishes synchronization with multiple base stations or acquires / adjusts timing advances corresponding to multiple base stations, and conceived a method for appropriately communicating with one or more base stations.

[0018] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Each aspect may be applied alone or in combination.

[0019] Note that in the present disclosure, "A / B" may mean "at least one of A and B".

[0020] In the present disclosure, a base station, eNB, gNB, next-generation radio base station, TRP, IAB (Integrated Access Backhaul) node (IAB node), device / UE that communicates / manages with a UE, etc. may be mutually substituted.

[0021] In the present disclosure, the timing advance (TA) may be the same as the TA in an existing system or may be information corresponding to the TA in an existing system.

[0022] In the present disclosure, the description of "base station" may refer to communication / transmission and reception by a certain transmission and reception beam with a certain base station. Also, in the present disclosure, communication / transmission and reception by different transmission and reception beams with the same base station may be read as communication with different base stations. For example, the present embodiment may also be applied when considering communication by a plurality of transmission and reception beams with a certain base station as one base station.

[0023] The present disclosure may be applied only to cases where UL synchronization (or TA) for multiple base stations is established within the same carrier (or frequency band), or may be applied only to cases where UL synchronization (or TA) for multiple base stations is established within different carriers (or frequency bands), or may be applied to both cases.

[0024] In the present disclosure, beam, TCI, TCI state, DL TCI state, UL TCI state, unified TCI state, QCL, QCL assumption, spatial relationship, spatial relationship information, spatial domain filter, precoder, etc. may be read as each other.

[0025] (First aspect) In the first aspect, the UE simultaneously holds information on TA (or information corresponding to TA) for a plurality of base stations / beams, and controls communication using information on one or more of the TAs. Note that TA may be read as TA value.

[0026] The UE may establish UL synchronization with a plurality of base stations by simultaneously holding information on TA (hereinafter also referred to as TA information) for a plurality of base stations / beams (see FIG. 1). FIG. 1 shows a case where the UE establishes UL synchronization with base stations #1 to #3. The UE may acquire / hold / adjust a plurality of TA information to control communication with each base station (for example, UL transmission to each base station).

[0027] (Acquisition of TA information) The UE may acquire one or more TA information (for example, TA information corresponding to one or more base stations) using a predetermined operation. The predetermined operation may be, for example, a random access procedure. Note that the acquisition of TA information is not limited to the random access procedure.

[0028] [Option 1-1] A plurality of TA information (for example, TA values) may be acquired by one random access procedure (see FIG. 2A). FIG. 2A shows a case where the UE acquires a plurality of TA values (for example, TA values #1-#3) by one random access procedure. The plurality of TA values may correspond to different base stations respectively. The random access procedure may be, for example, PRACH transmission (message 1 / message A) and RAR reception (message 2 / message B).

[0029] In this way, by establishing UL synchronization with multiple base stations, the UE can improve communication quality, improve reliability (ensure redundancy), etc. By establishing UL synchronization with multiple base stations, the UE can communicate flexibly in various use cases (for example, when there are dynamic changes in the form / configuration of the cells of the base station, or when the base station moves (for example, in the case of a mobile base station)).

[0030] 《Option 1-1-1》 The TA values for multiple base stations may be calculated and notified to the UE by transmitting one random access preamble (for example, PRACH). For example, the UE may transmit one PRACH, and multiple base stations may receive the same one PRACH transmitted from the UE. The TA information (or TA value, TA command) may be included in the random access response (RAR, or RAR MAC CE) corresponding to the response signal of the PRACH.

[0031] The UE may control the transmission of the PRACH based on the synchronization signal (or synchronization signal block, SS / PBCH block) transmitted from a certain base station. In this case, the UE may notify / report to the base station which synchronization signal from which base station the PRACH transmission is based on. Also, when multiple synchronization signals are transmitted to the UE, the UE may notify / report to the base station which synchronization signal the PRACH transmission is based on.

[0032] The notification / reporting to the base station may use the PRACH. For example, the conditions / parameters (resources, occasions, or sequences, etc.) used for PRACH transmission may be associated with the base station / synchronization signal. In this case, the UE may perform PRACH transmission using the conditions / parameters corresponding to the received synchronization signal.

[0033] 《Option 1-1-2》 TA values for each base station may be calculated by transmitting a plurality of PRACHs and notified to the UE. For example, the UE may transmit a plurality of random access preambles, and the plurality of base stations may receive at least one PRACH among the plurality of PRACHs transmitted from the UE.

[0034] TA information (e.g., TA value) may be notified from each base station to the UE. The base station may notify the UE of the TA value by using a random access response (e.g., RAR). For example, information regarding the TA value may be included in the RAR MAC CE.

[0035] The UE may receive TA information corresponding to each base station from the base station that has received the PRACH. The base station that has received a plurality of PRACHs may calculate the TA value based on a specific PRACH (e.g., the PRACH with the highest received power) and notify the UE of the TA information.

[0036] Alternatively, the UE may receive, from any base station that has received the PRACH, information including TA information for other base stations in addition to the TA information corresponding to the base station. For example, each base station that has received the PRACH may calculate the TA value corresponding to the received PRACH respectively, and may notify the TA information to a specific base station by using inter-base station communication (e.g., X2 interface). The specific base station may notify the UE of information including TA information corresponding to a plurality of base stations respectively. Thereby, the UE can acquire TA information corresponding to a base station with which the UE is not communicating.

[0037] In Option 1-1-1 / Option 1-1-2, in the random access procedure, the UE may be identified by transmitting and receiving a random access preamble. For example, the correspondence between a preamble index / RACH occasion and information that can identify the UE (e.g., UE ID, etc.) may be defined in the specification or notified / set from the base station to the UE. Alternatively, information that can identify the UE may be notified to the base station by a PUSCH or the like transmitted following the preamble.

[0038] Thereby, when a plurality of PRACHs are received at each base station, it is possible to determine from which UE the transmission was made (e.g., whether it was transmitted from the same UE). In this way, by the base station grasping the UE that is the transmission destination of the PRACH, it becomes possible to appropriately transmit a plurality of TA information to the UE.

[0039] Also, in Option 1-1-1 / Option 1-1-2, TA information may be notified to the UE in Message 4 (or Message B in the two-step random access procedure), or in a message / command thereafter. That is, the notification of TA information is not limited to RAR. Thereby, even if the base station cannot determine from which UE the transmission was made when receiving a PRACH, the base station may notify the TA information after Message 4 (after grasping the UE). Thereby, it becomes possible to appropriately notify the TA information to the UE.

[0040] Also, in Option 1-1-1 / Option 1-1-2, when a plurality of different base stations receive a preamble transmitted by the same UE, for Message 4 (or Message B), or a message thereafter (e.g., a message including TA information), each base station may transmit it to the UE respectively, or a specific base station may transmit it to the UE.

[0041] [Option 1-2] Multiple TA values may be obtained by a plurality of random access procedures (see Figure 2B). Figure 2B shows a case where the UE obtains a plurality of TA values (for example, TA values #1-#3) by a plurality of random access procedures. The plurality of TA values may each correspond to a different base station. The UE may obtain a TA value (for example, a TA value corresponding to a different base station) for each random access procedure.

[0042] 《Option 1-2-1》 A plurality of random access procedures may be triggered simultaneously. In this case, the UE may perform a plurality of random access procedures simultaneously (or in parallel).

[0043] 《Option 1-2-2》 A plurality of random access procedures may be triggered individually (or independently). In this case, the UE may perform a plurality of random access procedures in parallel within the same period.

[0044] Alternatively, the UE may control so that a plurality of random access procedures are not performed simultaneously. For example, after the first random access procedure ends (or expires / cancels), the second random access procedure may be controlled to be performed (or triggered). In this case, when a new random access procedure is triggered and a TA value is obtained, the TA value obtained by the previously performed random access procedure may be retained.

[0045] <Adjustment of TA value> When the UE holds a plurality of TA information (for example, TA values), the UE may adjust the TA value during communication. The timing for adjusting the TA values corresponding to a plurality of base stations may be when communicating (transmitting / receiving) with at least one of the plurality of base stations.

[0046] For example, when performing transmission / reception with each base station, the UE may be controlled to adjust the TA value with respect to the base station (see FIG. 3A). FIG. 3A shows a case where the UE adjusts the TA value #1 corresponding to base station #1 when performing communication (transmission / reception) with base station #1. The adjustment of the TA value may be performed based on information notified from the base station (e.g., TA command). In the case shown in FIG. 3A, since the UE only needs to adjust the TA value for the base station with which it is communicating, an increase in the processing load of the UE can be suppressed.

[0047] Alternatively, when performing transmission / reception with any one of the base stations, the UE may be controlled to collectively adjust a plurality of TA values (or a part of the plurality of TA values) that it holds (see FIG. 3B). FIG. 3B shows a case where when the UE performs communication (transmission / reception) with base station #1, in addition to the TA value #1 corresponding to base station #1, the TA value #2 corresponding to base station #2 and the TA value #3 corresponding to base station #3 are also adjusted.

[0048] The adjustment of each TA value may be performed based on adjustment information corresponding to each TA value. The adjustment information for each TA may be notified from the base station to the UE, or may be calculated according to a predetermined rule. In FIG. 3B, since the UE can update the TA values corresponding to each base station at a high frequency, the accuracy of UL synchronization with each base station can be improved.

[0049] (Second aspect) The second aspect describes UL transmission control when the UE holds a plurality of TA information.

[0050] The UE may control UL transmission based on any one of a plurality of TA information (e.g., TA values) (see FIG. 4). FIG. 4 shows an example of a case where a UE that holds a plurality of TA values (here, TA values #1 to #3) performs UL transmission using a specific TA value. The UE may control UL transmission based on at least one of the following options 2-1-1 to 2-1-4.

[0051] [Option 2-1-1] The UE may control UL transmission using the smallest TA value. For example, in FIG. 4, the UE may control UL transmission using TA value #1. Option 2-1 may be preferably applied to the case where the UL transmission sent from the UE is received by the nearest base station / cell (base station #1 in FIG. 4).

[0052] [Option 2-1-2] The UE may control UL transmission using the largest TA value. For example, in FIG. 4, the UE may control UL transmission using TA value #2. Option 2-2 may be preferably applied to the case where the UL transmission sent from the UE is received by a plurality of base stations / cells (for example, base stations #1 and #2 in FIG. 4).

[0053] [Option 2-1-3] The base station may instruct / set the UE as to which TA value to use. That is, the UE may perform UL transmission using the TA value instructed by the base station. Information regarding the instruction of the TA value from the base station may be included in the DCI that schedules UL transmission (for example, PUSCH). Thereby, each base station can specify an appropriate TA value to the UE using the DCI when scheduling UL transmission to each base station.

[0054] Alternatively, at least one activation / deactivation of a plurality of TA values may be instructed. For example, the activation / deactivation of each TA may be notified to the UE using DCI / MAC CE. By DCI / MAC CE, one TA value may be activated / deactivated, or a plurality of TA values may be activated / deactivated simultaneously. When a plurality of TA values are activated, the UE may select which TA value to use from the plurality of TA values, or may be controlled to perform a plurality of UL transmissions using the plurality of TA values.

[0055] [Option 2-1-4] The UE may determine the TA value to be applied to UL transmission based on predetermined conditions / parameters. The predetermined conditions / parameters may be, for example, at least one of the type of the received DL reference signal and the measurement result (e.g., quality, etc.) of the DL reference signal. Which conditions are applied (e.g., based on which conditions and which TA is used) may be specified in the specification or notified / set from the base station to the UE.

[0056] <At the time of UL transmission failure> When the UE fails / misses UL transmission, it may perform UL transmission (or UL retransmission) using another TA value (see FIGS. 5A and 5B). FIG. 5A shows an example where UL transmission performed by a UE holding a plurality of TA values (here, TA values #1 to #3) using a specific TA value (here, the first TA value) misses. FIG. 5B shows an example where a UE that misses UL transmission using the first TA value performs UL transmission (or UL retransmission) using another TA value (here, the second TA value).

[0057] The UE may determine that UL transmission has failed / missed when it cannot receive an ACK for the transmitted UL transmission. Alternatively, the UE may determine that UL transmission has failed / missed when it receives a NACK for the transmitted UL transmission.

[0058] The UE may control UL transmission based on at least one of the following Options 2-2-1 to 2-2-6.

[0059] [Option 2-2-1] The UE may perform UL transmission using a TA value with a smaller value next to the TA value (here, the first TA value) applied to the UL transmission that has failed.

[0060] [Option 2-2-2] The UE may perform UL transmission using a TA value with a larger value next to the TA value (here, the first TA value) applied to the UL transmission that has failed.

[0061] [Option 2-2-3] The UE may perform UL transmission by using the TA value with the largest difference from the TA value (here, the first TA value) applied to the UL transmission for which the transmission has failed.

[0062] [Option 2-2-4] The UE may perform UL transmission by using a TA value having different beam information / different transmission power information with respect to the beam information / transmission power information corresponding to the TA value of the UL transmission that has been transmitted erroneously (here, the first TA value). The correspondence relationship between the TA value and the beam / transmission power information may be notified / set from the base station to the UE.

[0063] [Option 2-2-5] The base station may instruct / set the UE as to which TA value to use. That is, the UE may perform UL transmission (or UL retransmission) by using the TA value instructed from the base station. Information regarding the instruction of the TA value (here, the second TA value) from the base station may be included in the DCI that instructs / schedules UL retransmission. Alternatively, information regarding the instruction of the TA value (here, the second TA value) from the base station may be instructed to the UE together with the NACK notification.

[0064] [Option 2-2-6] The UE may determine the TA value to be applied to UL transmission (or retransmission) based on a predetermined condition / parameter. The predetermined condition / parameter may be, for example, at least one of the type of the received DL reference signal and the measurement result (e.g., quality, etc.) of the DL reference signal. Which condition is applied (e.g., based on which condition, which TA is used) may be defined in the specification or may be notified / set from the base station to the UE.

[0065] <Multiple UL transmissions> When performing UL transmission, the UE may perform multiple UL transmissions using a plurality of TA information it holds (for example, it may perform multiple UL transmissions using different TA values simultaneously (or within a predetermined time unit)). For each UL transmission, different UL beams / different transmission powers may be applied (see Figure 6).

[0066] In Figure 6, a UE that holds a plurality of TA values (here, TA values #1 to #3) may transmit UL transmissions to which different TA values / different beams are applied simultaneously (or within a predetermined time unit). The predetermined time unit (or time interval) may be at least one unit of a slot, a sub-slot, or a predetermined symbol. Here, a case where UL transmission #1 using the first UL beam / first TA value and UL transmission #2 using the second UL beam / second TA value are performed simultaneously is shown.

[0067] The multiple UL transmissions may have the same information (for example, transport block / code block). In this case, the multiple UL transmissions may be transmitted with the same redundancy version (RV) applied. Alternatively, the multiple UL transmissions may be transmitted with different redundancy versions applied. Note that the multiple UL transmissions may have different information (for example, transport block / code block).

[0068] The multiple UL transmissions may be transmitted on the same time-frequency resource (Case 2-1). Alternatively, the multiple UL transmissions may be transmitted on a resource where either the time resource or the frequency resource is different (Case 2-2). Alternatively, the multiple UL transmissions may be transmitted on a resource where both the time resource and the frequency resource are different (Case 2-3).

[0069] UE capability may be defined for whether the UE can perform UL transmission (or support UL transmission) in Case 2-1 to Case 2-3. The UE may report UE capability information to the network (e.g., the base station) in advance as to which case the UE supports.

[0070] For example, when the UE is scheduled for UL transmission (e.g., PUSCH) from a certain base station, the UE may perform multiple UL transmissions using any of Case 2-1 to Case 2-3. The multiple UL transmissions may be controlled based on different TAs respectively. The resources used for the multiple UL transmissions may be specified by the DCI that schedules the UL transmission.

[0071] Alternatively, when the UE is configured for configured grant-based UL transmission (e.g., PUSCH), the UE may perform multiple UL transmissions using any of Case 2-1 to Case 2-3. The multiple UL transmissions may be controlled based on different TAs respectively. The resources used for the multiple UL transmissions may be specified by at least one of the upper layer parameters that configure the configured grant-based PUSCH and the DCI that indicates the activation of the configured grant-based PUSCH.

[0072] (The third aspect) The third aspect describes the case where the UE's positioning is performed using multiple TA information (e.g., TA values) held by the UE. The multiple TA information may be all the TA information held by the UE or some of the TA information held by the UE.

[0073] The TA information corresponds to information corresponding to the propagation time (or propagation distance) between each base station and the UE. Therefore, the UE / base station can estimate the UE's position based on the TA information with multiple base stations.

[0074] When the UE calculates / obtains information regarding the result of the UE's positioning, the UE may transmit / report the information regarding the result of the positioning to the base station. When the base station calculates / obtains information regarding the result of the positioning of a certain UE, the base station may notify the UE of the information regarding the result of the positioning.

[0075] The UE / base station may perform positioning considering at least one of information on the measured radio wave intensity / quality (e.g., RSRP / RSSI / RSRQ, etc.) and transmission / reception angle information in addition to a plurality of TA information.

[0076] When positioning is performed / calculated by a method different from the TA information (or without using the TA information), a TA value may be calculated using the result of the positioning. Even if it is not calculated and held as a TA value, UL synchronization may be directly performed using the positioning result. In other words, correction of the timing for starting UL transmission may be performed directly using the positioning result.

[0077] The correspondence between the positioning result and the TA value (or the correction of the UL synchronization timing) may be defined by the use or may be notified / set from the base station to the UE by upper layer signaling or the like.

[0078] Based on the value of the assumed error generated by determining the TA value (or the correction of the UL synchronization timing) based on the positioning, the frame configuration / physical channel configuration, etc. may be specified / set / switched. For example, a CP (Cyclic prefix) length that can cover the assumed error may be applied.

[0079] (Fourth aspect) The fourth aspect describes the case where different TAs are used for each transmission / reception beam with the base station.

[0080] The transmission / reception beam may be at least one of a UE transmission beam, a UE reception beam, a base station transmission beam, and a base station reception beam.

[0081] <Option 4-1> UL synchronization may be performed for each beam, and the TA may be retained. The UE may perform UL synchronization for each beam and retain the TA corresponding to each beam respectively.

[0082] The correspondence between each beam and UL synchronization (or TA) may be defined in the specification or notified / set by the base station to the UE.

[0083] The TA value obtained by random access procedures etc. using the beam for each beam may be applied. For example, in a certain random access procedure, the UE may assume that the beam used for PRACH transmission / the beam used for RAR reception corresponds to the TA value (for example, the TA value received in the RAR) obtained in the random access procedure.

[0084] It may be specified / notified that the TA changes with the beam switching.

[0085] <Option 4-2> UL synchronization may be performed for each of a plurality of beams, and the TA may be retained.

[0086] The correspondence between each beam and UL synchronization (or TA) may be defined by usage or notified / set by the base station to the UE.

[0087] The value obtained by random access procedures etc. using the beam for each beam may be applied as the TA value. A group applying the same TA value may be specified / notified.

[0088] It may be specified / notified that the TA changes with the beam switching.

[0089] <Option 4-3> It may be possible to notify the TA to be used in the beam after switching with the beam switching.

[0090] For example, the base station may notify the UE of the TA used in the beam after switching during the beam switching procedure. The base station may notify the UE of the TA value, or an index or the like may be assigned to the pre-acquired TA value, and the switching may be notified therein (in the numbered index).

[0091] (Wireless communication system) Hereinafter, the configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present disclosure.

[0092] FIG. 7 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0093] Further, the wireless communication system 1 may support dual connectivity (multi-RAT dual connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0094] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0095] The wireless communication system 1 may support dual connectivity between a plurality of base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC))).

[0096] The wireless communication system 1 may include a base station 11 that forms a relatively wide-coverage macro cell C1, and a base station 12 (12a - 12c) disposed within the macro cell C1 and forming a smaller small cell C2 than the macro cell C1. The user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and the user terminal 20 are not limited to the mode shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0097] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).

[0098] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). Macro cell C1 may be included in FR1, and small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these. For example, FR1 may correspond to a frequency band higher than FR2.

[0099] Also, the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0100] The plurality of base stations 10 may be connected by wire (e.g., an optical fiber compliant with Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the upper-level station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0101] The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one of, for example, Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0102] The user terminal 20 may be a terminal corresponding to at least one of communication systems such as LTE, LTE-A, 5G, etc.

[0103] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access method may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0104] The wireless access method may be referred to as a waveform. Note that in the wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the wireless access methods of the UL and the DL.

[0105] In the wireless communication system 1, as a downlink channel, a physical downlink shared channel (PDSCH) shared by each user terminal 20, a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), etc. may be used.

[0106] In the wireless communication system 1, as the uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc., which are shared by each user terminal 20, may be used.

[0107] User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH. User data, upper layer control information, etc. may be transmitted by the PUSCH. Also, the Master Information Block (MIB) may be transmitted by the PBCH.

[0108] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

[0109] Note that the DCI for scheduling the PDSCH may be called DL assignment, DL DCI, etc., and the DCI for scheduling the PUSCH may be called UL grant, UL DCI, etc. Note that the PDSCH may be read as DL data, and the PUSCH may be read as UL data.

[0110] For PDCCH detection, a control resource set (CORESET) and a search space may be used. The CORESET corresponds to the resources for searching for DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0111] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. in this disclosure may be read interchangeably with each other.

[0112] Uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (e.g., which may be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) may be transmitted by PUCCH. A random access preamble for cell connection establishment may be transmitted by PRACH.

[0113] Note that in this disclosure, the downlink, uplink, etc. may be expressed without the word "link". Also, the word "Physical" may be omitted at the beginning of various channels.

[0114] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may be transmitted.

[0115] The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, an SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.

[0116] Also, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may be transmitted. Note that DMRS may also be called a UE-specific reference signal.

[0117] (Base station) FIG. 8 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may be provided.

[0118] In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each part described below may be omitted.

[0119] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0120] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission / reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data, control information, a sequence, etc. to be transmitted as a signal and transfer it to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of a communication channel, state management of the base station 10, management of radio resources, etc.

[0121] The transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmission / reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0122] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0123] The transmitting and receiving antenna 130 can be composed of an antenna described based on the common understanding in the technical field related to the present disclosure, such as an array antenna.

[0124] The transmitting and receiving unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0125] The transmitting and receiving unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), etc.

[0126] The transmitting and receiving unit 120 (transmission processing unit 1211) may perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (for example, RLC retransmission control), processing of the Medium Access Control (MAC) layer (for example, HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, for example, and generate a bit string to be transmitted.

[0127] The transceiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0128] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 130.

[0129] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0130] The transceiver unit 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing on the acquired baseband signal, and acquire user data, etc.

[0131] The transmission / reception unit 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0132] The transmission path interface 140 may transmit and receive signals (backhaul signaling) with devices included in the core network 30, other base stations 10, etc., and acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0133] Note that the transmission unit and reception unit of the base station 10 in the present disclosure may be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0134] The transmission / reception unit 120 may transmit information regarding one or more timing advances based on the random access procedure. The transmission / reception unit 120 may receive UL transmissions transmitted from the terminal based on at least one of the information regarding a plurality of timing advances.

[0135] The control unit 110 may control one or more random access procedures with a certain terminal.

[0136] (User Terminal) FIG. 9 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. Note that one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided.

[0137] Note that in this example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0138] The control unit 210 controls the entire user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0139] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission, reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0140] The transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 can be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0141] The transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be configured from a transmission unit and a reception unit. The transmission unit may be configured from the transmission processing unit 2211 and the RF unit 222. The reception unit may be configured from the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0142] The transmission / reception antenna 230 can be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna or the like.

[0143] The transmission / reception unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 220 may transmit the above-described uplink channel, uplink reference signal, etc.

[0144] The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0145] The transmission / reception unit 220 (transmission processing unit 2211) may perform processing of the PDCP layer, processing of the RLC layer (e.g., RLC retransmission control), processing of the MAC layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 210, and generate a bit sequence to be transmitted.

[0146] The transmission / reception unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit sequence to be transmitted, and output a baseband signal.

[0147] Whether to apply DFT processing may be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is enabled, the transmission / reception unit 220 (transmission processing unit 2211) may perform DFT processing as the above-described transmission processing to transmit the channel using the DFT-s-OFDM waveform, or otherwise may not perform DFT processing as the above-described transmission processing.

[0148] The transmission / reception unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 230.

[0149] On the other hand, the transmission / reception unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmission / reception antenna 230.

[0150] The transmission / reception unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0151] The transmission / reception unit 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), reception quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0152] Note that the transmission unit and reception unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0153] The transmission / reception unit 220 may acquire information regarding a plurality of timing advances respectively corresponding to a plurality of base stations or transmission / reception points based on a random access procedure. The transmission / reception unit 220 may perform UL transmission based on at least one of the information regarding the plurality of timing advances. The transmission / reception unit 220 may perform a plurality of UL transmissions respectively corresponding to the information regarding the plurality of timing advances in a predetermined time unit.

[0154] The control unit 210 may control one or more random access procedures. For example, the control unit 210 may control to acquire / hold information regarding a plurality of timing advances respectively corresponding to a plurality of base stations or transmission / reception points based on one or more random access procedures. The control unit 210 may control UL transmission based on at least one of the information regarding the plurality of timing advances held.

[0155] When performing transmission or reception with at least one of a plurality of base stations or transmission / reception points, the control unit 210 may control to adjust the value of at least one of the plurality of timing advances.

[0156] The control unit 210 may control to perform a plurality of UL transmissions respectively corresponding to the information regarding the plurality of timing advances in a predetermined time unit.

[0157] The control unit 210 may determine position measurement using at least two or more of the information regarding the plurality of timing advances.

[0158] (Hardware Configuration) Note that the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (components) are realized by an arbitrary combination of at least one of hardware and software. Also, the realization method of each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (for example, using wired, wireless, etc.) connected and realized using these plurality of devices. The functional block may be realized by combining software with the above one device or the above plurality of devices.

[0159] Here, functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, election, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, etc. For example, a functional block (component) that enables transmission may be referred to as a transmitting unit, a transmitter, etc. In any case, as described above, the implementation method is not particularly limited.

[0160] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 10 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may physically be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0161] Note that in the present disclosure, terms such as device, circuit, device, section, unit, etc. can be read interchangeably with each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0162] For example, although only one processor 1001 is shown in the figure, there may be a plurality of processors. Also, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

[0163] Each function in the base station 10 and the user terminal 20 is realized, for example, by causing a processor 1001 to read a predetermined software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communication via a communication device 1004, or controls at least one of reading and writing data in the memory 1002 and a storage 1003.

[0164] The processor 1001 controls the entire computer by operating, for example, an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the above-described control unit 110 (210), transmission / reception unit 120 (220), and the like may be realized by the processor 1001.

[0165] Further, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program for causing a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and the same may be true for other functional blocks.

[0166] The memory 1002 is a computer-readable recording medium and may be composed of, for example, at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), a software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0167] The storage 1003 is a computer-readable recording medium and may be composed of, for example, at least one of a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disc (Compact Disc ROM (CD-ROM), etc.)), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other suitable storage media. The storage 1003 may be referred to as an auxiliary storage device.

[0168] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-described transceiver unit 120 (220), the transceiver antenna 130 (230), etc. may be implemented by the communication device 1004. The transceiver unit 120 (220) may be physically or logically separated and implemented by a transmitter unit 120a (220a) and a receiver unit 120b (220b).

[0169] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

[0170] Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses for each device.

[0171] In addition, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA), and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0172] (Modification example) Regarding the terms described in the present disclosure and the terms necessary for understanding the present disclosure, they may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be read interchangeably with each other. Also, a signal may be a message. A reference signal may also be abbreviated as RS and may be called a Pilot, a pilot signal, etc. depending on the applied standard. Also, a Component Carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, etc.

[0173] The radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be called a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0174] Here, the new numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The new numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering process performed by the transceiver in the frequency domain, specific windowing process performed by the transceiver in the time domain, etc.

[0175] A slot may be composed of one or more symbols (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Also, a slot may be a time unit based on the new numerology.

[0176] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot may be called PDSCH (PUSCH) mapping type B.

[0177] A radio frame, sub-frame, slot, mini-slot, and symbol all represent time units for signal transmission. For a radio frame, sub-frame, slot, mini-slot, and symbol, another corresponding name may be used. Note that the time units such as frame, sub-frame, slot, mini-slot, and symbol in this disclosure may be read interchangeably with each other.

[0178] For example, one sub-frame may be called a TTI, or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be a sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc. instead of a sub-frame.

[0179] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of the TTI is not limited to this.

[0180] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), code block, codeword, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when the TTI is given, the time interval (for example, the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0181] When one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (number of mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0182] A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0183] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and equal to or more than 1 ms.

[0184] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0185] Also, the RB may include one or a plurality of symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, etc. may each be constituted by one or a plurality of resource blocks.

[0186] Note that one or more RBs may be referred to as a Physical Resource Block (PRB), a Sub-Carrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, etc.

[0187] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 sub-carrier and 1 symbol.

[0188] A Bandwidth Part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0189] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be set within one carrier for a UE.

[0190] At least one of the set BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined channel / signal outside the active BWP. Note that in the present disclosure, "cell", "carrier", etc. may be read as "BWP".

[0191] Note that the structures such as the above-described radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be variously changed.

[0192] Also, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or using corresponding other information. For example, a radio resource may be indicated by a predetermined index.

[0193] The names used for parameters, etc. in the present disclosure are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0194] The information, signals, etc. described in the present disclosure may be represented using any of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0195] Also, information, signals, etc. may be output from at least one of the upper layer to the lower layer and from the lower layer to the upper layer. Information, signals, etc. may be input and output via a plurality of network nodes.

[0196] The input / output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. The information, signals, etc. to be input / output may be overwritten, updated, or appended. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

[0197] The notification of information is not limited to the aspects / embodiments described in the present disclosure and may be performed using other methods. For example, the notification of information in the present disclosure may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0198] Note that the physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Also, the RRC signaling may also be referred to as an RRC message and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. Further, the MAC signaling may be notified, for example, using a MAC Control Element (CE).

[0199] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to an explicit notification and may be performed implicitly (e.g., by not performing the notification of the predetermined information or by the notification of another piece of information).

[0200] The determination may be made based on a value represented by 1 bit (either 0 or 1), a boolean value represented by true or false, or a numerical comparison (e.g., comparison with a predetermined value).

[0201] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0202] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0203] The terms "system" and "network" used in this disclosure may be used interchangeably. "Network" may mean the devices (e.g., base stations) included in the network.

[0204] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. may be used interchangeably.

[0205] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. The base station may also be referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0206] A base station can accommodate one or more (e.g., three) cells. When the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each of these smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base station and the base station subsystem that provides communication services in this coverage.

[0207] In this disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0208] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate term.

[0209] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves without a driver (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0210] Also, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured to be functions of the user terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be replaced with a side channel.

[0211] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal 20 may be configured to be functions of the base station 10.

[0212] In the present disclosure, operations assumed to be performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME), Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

[0213] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the presented specific order.

[0214] Each aspect / embodiment described in the present disclosure may be applicable to systems using Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (x is, for example, an integer or a decimal), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable wireless communication methods, and next-generation systems extended based on these. Further, multiple systems may be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

[0215] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0216] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These terms can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed or that the first element must precede the second element in any way.

[0217] The term "determining" as used in this disclosure may encompass a wide variety of operations. For example, "determining" may be considered to be "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up, search, inquiry" (e.g., searching in a table, database, or another data structure), "ascertaining", etc.

[0218] Also, "determining" may be considered to be "receiving" (e.g., receiving information), "transmitting" (e.g., transmitting information), "input", "output", "accessing" (e.g., accessing data in a memory), etc.

[0219] Also, "determining" may be considered to be "resolving", "selecting", "choosing", "establishing", "comparing", etc. That is, "determining" may be considered to be "determining" any operation.

[0220] Also, the term "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

[0221] As used in this disclosure, the terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed".

[0222] In this disclosure, when two elements are connected, they can be considered to be "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and also, by way of some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, optical (both visible and invisible) region, etc.

[0223] In this disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate", "coupled", etc. may also be interpreted in the same way as "different".

[0224] In this disclosure, when the terms "include", "including", and their variations are used, these terms are intended to be inclusive, in the same way as the term "comprising". Further, the term "or" as used in this disclosure is not intended to be an exclusive disjunction.

[0225] In the present disclosure, for example, when articles are added by translation, such as a, an, and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0226] As described above, the invention according to the present disclosure has been described in detail. However, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A control unit that controls one or more random access procedures; A receiving unit that acquires information regarding a plurality of timing advances respectively corresponding to a plurality of base stations or transmission / reception points based on the random access procedure; A transmitting unit that performs UL transmission based on at least one of the information regarding the plurality of timing advances, and the receiving unit is a terminal that acquires information regarding the plurality of timing advances based on one random access procedure.

2. The control unit controls to adjust the value of at least one timing advance among the plurality of timing advances when performing transmission or reception with at least one of the plurality of base stations or transmission / reception points. The terminal according to Claim 1.

3. The transmitting unit performs a plurality of UL transmissions respectively corresponding to the information regarding the plurality of timing advances in a predetermined time unit. The terminal according to Claim 1 or Claim 2.

4. The control unit determines position measurement using at least two or more pieces of information among the information regarding the plurality of timing advances. The terminal according to any one of Claims 1 to 3.

5. A step of controlling one or more random access procedures; A step of acquiring information regarding a plurality of timing advances respectively corresponding to a plurality of base stations or transmission / reception points based on the random access procedure; A step of performing UL transmission based on at least one of the information regarding the plurality of timing advances, and a radio communication method for a terminal that acquires information regarding the plurality of timing advances based on one random access procedure.

6. A control unit that controls one or more random access procedures; A transmitting unit that transmits information regarding a plurality of timing advances based on the random access procedure; A receiving unit that receives UL transmission transmitted from a terminal based on at least one of the information regarding the plurality of timing advances, and the transmitting unit is a base station that transmits information regarding the plurality of timing advances based on one random access procedure.

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