Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with a control unit that determines a control channel element (CCE) index on the basis of a first derivation method relating to the CCE index corresponding to a candidate of a physical downlink control channel (PDCCH) using a plurality of layers, the first derivation method being different from a second derivation method, and the second derivation method being different from the first derivation method. The second derivation method is related to a CCE index corresponding to a candidate of a PDCCH using one layer; and a receiving unit that performs monitoring using the PDCCH of the plurality of layers on the basis of the CCE index. According to one mode of the disclosure, the resource efficiency can be improved.

Description

Technical Field

[0001] This disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems. Background Technology

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was standardized with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was standardized with the aim of further increasing capacity and improving upon LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).

[0003] The development of successor systems to LTE is also underway (e.g., also known as the 5th generation mobile communication system (5G), 5G+ (plus), the 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.).

[0004] Existing technical documents

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In future wireless communication systems (e.g., NR), for example, from the perspective of improving resource efficiency, efforts are being made to increase the capacity of the downlink control channel.

[0009] However, the specific methods used have not been fully studied. This lack of research raises concerns that it may hinder improvements in resource efficiency and suppress increases in communication throughput.

[0010] Therefore, one of the purposes of this disclosure is to provide terminals, wireless communication methods, and base stations that can improve resource efficiency.

[0011] Methods for solving problems

[0012] One aspect of this disclosure relates to a terminal comprising: a control unit that determines the CCE index based on a first derivation method relating to the control channel element (CCE) index corresponding to a candidate physical downlink control channel (PDCCH) using multiple layers, wherein the first derivation method is different from a second derivation method, the second derivation method relating to the CCE index corresponding to a candidate PDCCH using one layer; and a receiving unit that monitors the PDCCH using the multiple layers based on the CCE index.

[0013] Invention Effects

[0014] According to one method disclosed herein, resource efficiency can be improved. Attached Figure Description

[0015] Figure 1A This is a diagram illustrating an example of the number of UEs that can be accommodated in each time slot / symbol of each channel. Figure 1B This is a diagram illustrating an example of the number of UEs that can be accommodated in each cell of each channel.

[0016] Figure 2A as well as Figure 2B This is a diagram illustrating an example of resource overlap among PDCCH candidates.

[0017] Figure 3 This is a diagram illustrating an example of PDCCH DMRS using FD-OCC.

[0018] Figure 4 This is a diagram illustrating other examples of PDCCH DMRS with FD-OCC application.

[0019] Figure 5 This is a diagram illustrating other examples of PDCCH DMRS with FD-OCC application.

[0020] Figure 6 This is a diagram illustrating an example of PDCCH DMRS using TD-OCC.

[0021] Figure 7 This is a diagram illustrating other examples of PDCCH DMRS applying TD-OCC.

[0022] Figure 8 This is a diagram illustrating an example of PDCCH DMRS using FD-OCC and TD-OCC.

[0023] Figure 9 This is a diagram illustrating other examples of PDCCH DMRS using FD-OCC and TD-OCC.

[0024] Figure 10 This is a diagram illustrating an example of PDCCH DMRS using FDM.

[0025] Figure 11 This is a diagram illustrating other examples of PDCCH DMRS using FDM.

[0026] Figure 12 This is a diagram illustrating an example of PDCCH DMRS using TDM.

[0027] Figure 13 This is a diagram illustrating other examples of PDCCH DMRS applying TDM.

[0028] Figure 14 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment.

[0029] Figure 15 This is a diagram illustrating an example of the structure of a base station according to one embodiment.

[0030] Figure 16 This is a diagram illustrating an example of the structure of a user terminal according to one embodiment.

[0031] Figure 17 This is a diagram illustrating an example of the hardware structure of a base station and a user terminal according to one embodiment.

[0032] Figure 18 This is a diagram illustrating an example of a vehicle according to one embodiment. Detailed Implementation

[0033] (Minimum quality guarantee in future wireless communication systems)

[0034] In existing wireless communication systems (e.g., up to Rel. 15-17), mobile communication using public networks is typically what is known as best-effort communication.

[0035] This type of communication is characterized by the fact that communication operators cannot control sudden increases in traffic volume. For example, in densely populated environments such as concerts or stadiums, when traffic surges suddenly or explosively, there may be problems such as being unable to guarantee even the minimum required level of communication (e.g., being unable to make phone calls or browse the web).

[0036] In existing wireless communication systems (e.g., up to Rel. 15-17), mission-critical use cases (e.g., Ultra-Reliable and Low Latency Communications (URLLC)) were investigated.

[0037] However, in the case of mission-critical communication services on the public network, as mentioned above, with the increase of surrounding business or the increase of business within the mission-critical communication service, it can be considered that the desired communication quality (e.g., throughput / latency / number of simultaneous connections, etc.) will not be achieved.

[0038] Therefore, in future wireless communication systems, both ordinary users and mission-critical use cases will require mechanisms that can ensure minimum communication quality.

[0039] However, it is difficult to guarantee minimum quality with limited resources.

[0040] For example, if the instantaneous number of users is assumed to be unknown, it is difficult to provide minimum quality assurance for all users using limited resources.

[0041] Furthermore, the minimum quality that can be guaranteed varies depending on the performance / type of the device / terminal, making it difficult to achieve the following minimum quality guarantee: meeting the KPIs (Key Performance Indicators) required by any user.

[0042] Furthermore, since the quality of wireless communication can change constantly due to various factors, it is difficult to always ensure specific performance KPIs (e.g., throughput / reliability).

[0043] Furthermore, due to limitations in the number of base stations / transmit / receive points that can be configured, or factors such as the surrounding communication environment, it is difficult to ensure a specific quality in every location.

[0044] As a method for providing minimum quality compensation (guarantee) for multiple terminals (user terminal, user equipment (UE)), it is possible to consider scheduling data channels (e.g., PDSCH / PUSCH) simultaneously for multiple UEs.

[0045] The following is an example of calculating the number of multiplexing of UE in FR1 (in particular, in the case of a data transmission period of 20ms and a data size (transmission block size) ≥320 in the required throughput (12.65kbps) of VoLTE (Voice over LTE).

[0046] The calculation conditions are as follows:

[0047] • Bandwidth settings: FR1, 100MHz, subcarrier spacing = 30kHz.

[0048] • TDD setting: DDDSUUDDDD (5ms period, D for DL ​​time slot, U for UL time slot, S for special time slot (for simplicity, set to only be able to send PDCCH)).

[0049] • PDCCH: Uses symbol #0 or #0 to #1. The DCI has 40 bits. It becomes the aggregation level of code rates below PDSCH.

[0050] • PDSCH: As mapping mode 1, DMRS with a symbol length of 13 symbols and 2 symbols (non-data multiplexing). As mapping mode 2, DMRS with a symbol length of 12 symbols and 2 symbols (non-data multiplexing).

[0051] • PUSCH: DMRS (non-data multiplexing) with a symbol length of 14 symbols and 2 symbols.

[0052] • Other reference signals (RS) / channels are not considered.

[0053] Figure 1A This is a diagram illustrating an example of the number of UEs that can be accommodated in each time slot / symbol of each channel. Figure 1A The example shown is an example of calculating the number of UEs that can be accommodated for each time slot of each channel based on the number of RBs.

[0054] Under the above conditions, when calculating the number of UEs that can be accommodated per symbol for the PDCCH, with a Modulation Coding Scheme (MCS) index of 0, each UE requires 24 Resource Blocks (RBs), thus the calculated number of UEs is 11. Furthermore, with an MCS index of 5, each UE requires 12 RBs, thus the calculated number of UEs is 22.

[0055] Similarly, when calculating the number of UEs that can be accommodated per PDSCH per time slot, with an MCS index of 0, each UE requires 11 RBs for mode 1 and 12 RBs for mode 2, thus the calculated number of UEs is 22 to 24. Furthermore, with an MCS index of 5, each UE requires 4 RBs for both modes 1 and 2, thus the calculated number of UEs is 68.

[0056] Furthermore, when calculating the number of UEs accommodated per time slot for a PUSCH, with an MCS index of 0, each UE requires 10 RBs, resulting in a calculated number of UEs of 27. Additionally, with an MCS index of 5, each UE requires 3 RBs, resulting in a calculated number of UEs of 91.

[0057] Figure 1B This is a diagram illustrating an example of the number of UEs that can be accommodated in each cell of each channel. Figure 1B An example is shown that, based on TDD settings, the number of UEs accommodated per cell for each channel (or the number of DCIs for PDCCH) is calculated.

[0058] Under the above conditions, when calculating the number of PDCCH / DCIs per cell, with an MCS index of 0, a 1-symbol PDCCH can accommodate 392 DCIs (UL DCI and DL DCI), and a 2-symbol PDCCH can accommodate 784 DCIs (UL DCI and DL DCI). Furthermore, with an MCS index of 5, a 1-symbol PDCCH can accommodate 784 DCIs (UL DCI and DL DCI), and a 2-symbol PDCCH can accommodate 1568 DCIs (UL DCI and DLDCI).

[0059] Similarly, when calculating the number of UEs that can be accommodated per PDSCH for each cell, with an MCS index of 0, for Mode 1, each UE requires 11 RBs, so the calculated number of UEs is 672; for Mode 2, each UE requires 12 RBs, so the calculated number of UEs is 616. Furthermore, with an MCS index of 5, for both Mode 1 and Mode 2, each UE requires 4 RBs, so the calculated number of UEs is 1904.

[0060] Furthermore, when calculating the number of UEs that can be accommodated per cell for PUSCH, with an MCS index of 0, each UE requires 10 RBs, so the calculated number of UEs is 216. Additionally, with an MCS index of 5, each UE requires 3 RBs, so the calculated number of UEs is 728.

[0061] Thus, under the assumption of VoLTE's required throughput, even in a TDD setting where DL resources exceed UL resources, each time slot can allocate up to 216 UEs' PUSCH (when the MCS index is 0).

[0062] In order to schedule the PUSCH of 216 UEs, a control channel (e.g., PDCCH / DCI) for scheduling PUSCH needs to be sent in one or more DL slots.

[0063] As mentioned above, the number of PDCCH / DCI for each cell is at least approximately 400, which can be considered sufficiently large.

[0064] However, this is only an example of a scenario where all PDCCH resources can be used to fill the PDCCH / DCI. In actual transmission, due to PDCCH overbooking, the base station cannot transmit as many PDCCHs as calculated above simultaneously. In other words, if the candidate PDCCH resources between UEs overlap in the time domain, a state where PDCCH transmission is impossible will occur.

[0065] (PDCCH candidate)

[0066] In existing wireless communication systems (NR Rel.15-17), the CCE index corresponding to the PDCCH candidate in CORESET: p, aggregation level: L, search space: s is determined based on the following formula (hash function):

[0067]

[0068] Here, N CCE，p This is the number of CCEs in CORESETP. CI This is the value of the carrier indicator field. M （L） s，n_CI It is set to target n CI The search space s of the corresponding serving cell, the aggregation level L, and the number of PDCCH candidates to be monitored, m （L） s，n_CI It is 0 to M （L） s，n_CI The value of .

[0069] In addition, Y p、n＾μ_s、f It is a value determined based on at least one of the search space type, RNTI, and slot number. In the case of CSS, Y p、n＾μ_s、f =0.

[0070] In the case of USS, Y p、n＾μ_s、f The decision is based on the following formula.

[0071]

[0072] Here, as Y p、n＾μ_s、f The initial value of Y p，-1 It is the value of C-RNTI (n RNTI A p The remainder when p is divided by 3 (p mod 3) is 0 is 39827, the remainder when p is divided by 3 is 1 is 39829, and the remainder when p is divided by 3 is 2 is 39839. Therefore, D is 65537.

[0073] That is, according to the above formula, in the case of USS, the CCE index that becomes a PDCCH candidate is different for each UE and for each time slot.

[0074] According to this calculation method, frequency diversity for each UE can be used to the maximum extent and interference between cells can be randomized. On the other hand, it is difficult to perform the following scheduling, namely, resource overlap between specific UEs that become PDCCH candidates.

[0075] This is because Y p、n＾μ_s、f Based on CORESET index / Y p，-1 The value of C-RNTI (e.g., any value between 0 and 65535) is more likely to differ for each UE, as Y... p、n＾μ_s、f The initial value of Y p，-1 Basically, it varies from UE to UE, so for multiple UEs (multiple UEs with low spatial correlation), Y will be... p、n＾μ_s、f Setting them to the same value is difficult.

[0076] That is, it is difficult to set the CCE index to the same value for multiple UEs (multiple UEs with low spatial correlation), and therefore it is difficult to make the PDCCH candidate resources overlap for multiple UEs (multiple UEs with low spatial correlation).

[0077] Furthermore, in Equation 1 of the existing specification, the CCE index that becomes a PDCCH candidate varies based on the number of CCEs, the number of monitored PDCCHs (candidates), and the value of RNTI. The number of CCEs is determined based on the number of RBs / symbols in the CORESET.

[0078] Furthermore, in the existing specification, the CCE index is assigned to each REG bundle. When REG bundles are interleaved, the monitored PRB is based on the offset index (shiftIndex(n)) involved in the interleaving. shift The size of the interleaver (R) and the bundle size of the REG (reg-BundleSize (L)) are determined by the size of the interleaver (R) and the bundle size of the REG (reg-BundleSize (L)).

[0079] Therefore, as will be discussed later, if you want to dynamically change the CCE index, you need to dynamically change at least one of the following: the number of CCEs, the number of monitored PDCCHs, and the RNTI value.

[0080] (analyze)

[0081] As described above, as a method for minimum quality compensation, in order to schedule data channels (e.g., PDSCH / PUSCH) for multiple UEs simultaneously, there is a need for improved frequency / space utilization efficiency in allocating PDCCHs that can accommodate more UEs using limited resources. In other words, as a method for minimum quality compensation, there is a need for methods to increase PDCCH capacity.

[0082] More specifically, there is a need for technologies / methods that enable low-data-rate communication even when there are limited resources available to allocate to a UE, as well as technologies / methods for improving the frequency utilization efficiency of resources (e.g., spatial multiplexing of channels / signals).

[0083] Furthermore, from the perspective of improving resource efficiency in future wireless communication systems, it is also preferable to increase PDCCH capacity.

[0084] For example, in cases where multi-layer / port is used for PDCCH (e.g., in cases where multi-user (MU-) MIMO is utilized in PDCCH), UEs with low spatial correlation need to share at least a portion of the PDCCH candidate (the resources of the PDCCH candidate).

[0085] For example, when the spatial correlation between UE#1 and UE#2 is low, it is preferable to be able to perform scheduling such that at least a portion of the resources of the PDCCH candidates overlap in the entire / specific search space / CORESET.

[0086] Figure 2A This illustrates the search space / CORESET for multiple UEs (UE#1 and UE#2) within a specific search space / CORESET. Figure 2A The example shown is an example of resource overlap for PDCCH candidates in SS#1).

[0087] Figure 2B This demonstrates the search space / CORESET (in the context of multiple UEs, including UE#1 and UE#2) across the entire search space. Figure 2B The example shown is an example of resource overlap between PDCCH candidates in SS#1 and SS#2.

[0088] However, as mentioned earlier, when determining PDCCH candidate resources based on hash functions specified in existing specifications, it is difficult to overlap PDCCH candidate resources for multiple UEs (multiple UEs with low spatial correlation). Therefore, a method is needed to overlap PDCCH candidate resources for multiple UEs.

[0089] However, such methods have not been adequately studied. If this research is insufficient, the minimum quality guarantee of communication cannot be ensured, and there are concerns that increased communication throughput may be suppressed.

[0090] Therefore, the inventors of this invention have devised a method to solve the above-mentioned problems.

[0091] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods involved in each embodiment can be applied individually or in combination.

[0092] In this disclosure, "A / B" and "at least one of A and B" may be rewritten as each other. In addition, in this disclosure, "A / B / C" may also mean "at least one of A, B and C".

[0093] In this disclosure, terms such as notification, activation, deactivation, indication (or indication), selection, configuration, update, and determination can be overridden. Similarly, terms such as support, control, ability to control, operation, and ability to operate can also be overridden.

[0094] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-level parameters, fields, Information Elements (IE), settings, etc., can also be modified interchangeably. In this disclosure, Medium Access Control (MAC) elements (MAC ControlElement (CE)), update commands, activation / deactivation commands, etc., can also be modified interchangeably.

[0095] In this disclosure, higher-layer signaling may be, for example, any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., positioning protocol messages such as NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP) messages, etc., from the core network).

[0096] In this disclosure, MAC signaling may also use, for example, a MAC Control Element (MACCE) or a MAC Protocol Data Unit (PDU). Broadcast information may also be, for example, a Master Information Block (MIB), a System Information Block (SIB), a Minimum System Information (Remaining Minimum System Information (RMSI)), or Other System Information (OSI).

[0097] In this disclosure, physical layer signaling may also be, for example, downlink control information (DCI), uplink control information (UCI), etc.

[0098] In this disclosure, terms such as discard, abort, cancel, truncate, rate match, postpone, and do not send can be rewritten interchangeably.

[0099] (Wireless communication method)

[0100] The UE can also use a rank / layer greater than 1 to receive the PDCCH.

[0101] By using multiple ranks / layers to receive PDCCH, the frequency resources (e.g., aggregation rank) used to transmit PDCCH at the required coding rate can be reduced, thereby improving the UE's multiplexing capacity / accommodation (PDCCH capacity).

[0102] The various embodiments of this disclosure can also be applied only when specific parameters / fields are set using higher-level signaling (e.g., RRC signaling / MAC CE).

[0103] For example, it is also possible that the PDCCH receive layer number / rank is set to the UE using higher-layer signaling, and the UE uses the set layer number / rank to receive DCI.

[0104] For example, it is also possible that the maximum number of layers / maximum rank for PDCCH reception is set to the UE using higher-layer signaling, and the UE uses the number of layers / ranks below the set maximum number of layers / maximum rank to receive DCI.

[0105] Based on this higher-level signaling, the settings can also be configured for each search space / each CORESET / each BWP / each CC / each band domain / each UE.

[0106] The embodiments disclosed herein may also be applied only if specific UE capability information (support for specific UE capabilities) has been reported.

[0107] The UE capability information can be reported, for example, by each band domain, by each band domain combination (BC), by each band domain within a BC, or by each CC per CC per band in BC.

[0108] The various embodiments disclosed herein can also be applied to specific search spaces (SS) / SS sets.

[0109] This specific SS / SS set can be, for example, a UE-specific search space (USS) or a specific common search space (CSS, such as type 3 CSS). By configuring it in this way, for example, it is possible to set up a CSS structure for multiple UEs that excludes CSS of type 0 / 0A / 1 / 2.

[0110] The embodiments disclosed herein can also be applied to specific DCI formats (transmitting PDCCHs in specific DCI formats).

[0111] This specific DCI format can be, for example, a DCI format that excludes the group-common DCI format (e.g., DCI format 2_x (x is any integer)) and the DCI format used for multicast / broadcast (e.g., DCI format 4_x (x is any integer)). With this configuration, a structure can be created that excludes the DCI formats for multiple UEs.

[0112] The specific DCI format may be, for example, at least one of a set of common DCI formats (e.g., DCI format 2_x (x is any integer)) and a DCI format for multicast / broadcast (e.g., DCI format 4_x (x is any integer)).

[0113] Alternatively, the various embodiments of this disclosure can be applied to specific time resources (e.g., time slots / symbols).

[0114] This specific time resource could also be, for example, a DL / UL / special time slot (or a code).

[0115] The various embodiments disclosed herein can also be applied to specific BWP / CCs, for example.

[0116] For example, the specific BWP / CC could be the BWP / CC of PCell / PSCell / SpCell, or it could be the BWP / CC of SCell.

[0117] In the various embodiments of this disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL)", "transmission configuration indication state (TCI state)", "spatial relation", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "layer", "number of layers", "rank", "resource", "resource set", "beam", "beamwidth", "beam angle", "antenna", "antenna element", "panel", "UE panel", "transmitting entity", and "receiving entity" can also be rewritten interchangeably.

[0118] In the various embodiments of this disclosure, MIMO (Multi-Input Multi-Output), multi-layer, and multi-port can also be rewritten in different ways.

[0119] The various embodiments of this disclosure may also relate to MIMO (Multi-User (MU-) MIMO) operation with multiple UEs. In this disclosure, MU-MIMO may also refer to the transmission / reception of signals / channels using multiple layers / ports / ranks, with at least a portion of the time / space resources overlapping among multiple UEs.

[0120] In the various embodiments of this disclosure, MU-MIMO, PDCCH-MIMO, transmission / reception using multiple layers / ports, PDCCH using multiple layers / ports, and transmission / reception using multiple (two or more) ports / port numbers / port indices can also be rewritten to each other.

[0121] In various embodiments of this disclosure, the PDCCH resources of one UE and the PDCCH resources of another UE may overlap in a specific search space / CORESET.

[0122] The overlap of resources for multiple UEs can be a partial overlap of the resource or a complete overlap of the resource.

[0123] In this disclosure, the CCE index that becomes a PDCCH candidate, the CCE index corresponding to the PDCCH candidate, and the CCE index of the PDCCH candidate can also be rewritten to each other.

[0124] <First Implementation>

[0125] The first implementation involves the derivation of CCE indexes that become PDCCH candidates.

[0126] The first implementation method is generally divided into implementation methods 1-1 and 1-2. The UE / base station can apply either implementation method 1-1 or 1-2, or it can combine implementation methods 1-1 and 1-2.

[0127] Implementation Method 1-1

[0128] UE can also derive / determine CCE indexes that become PDCCH candidates based on specific mathematical formulas / methods / rules.

[0129] This particular mathematical formula / method / rule can also be a different mathematical formula than Formula 1 above (a second mathematical formula).

[0130] The second mathematical expression may also be determined without being based on at least one of a specific Radio Network Temporary Identifier (RNTI), a CORESET index, and a search space. In other words, the second mathematical expression may also not contain at least one of a term associated with a specific RNTI, a term associated with a CORESET index, and a term associated with a search space.

[0131] Implementation Methods 1-2

[0132] In the second mathematical expression, the specific terms included in Equation 1 above (e.g., Y) p、n＾μ_s、f The terms can also be different. The second mathematical expression may also not contain the specific terms included in Equation 1 above (e.g., Y). p、n＾μ_s、f ) and contain different terms (e.g., Y' p、n＾μ_s、f ).

[0133] In the second mathematical expression, the distinct term may also be a term not based on a specific RNTI (e.g., C-RNTI) value, a CORESET index, or at least one of the search space.

[0134] In the second mathematical expression, the different term can also be a term that is independent of (not based on) time slots.

[0135] According to the first embodiment above, by not using the existing CCE index export method, it is possible to achieve resource overlap for PDCCH candidates of multiple UEs.

[0136] <Second Implementation>

[0137] The second embodiment involves "different items (e.g., Y')" as described in the first embodiment above. p、n＾μ_s、f Exporting ")".

[0138] Y' p、n＾μ_s、f It can also be specified by a recursive formula based on specific time resources (e.g., symbol / slot). In other words, Y' p、n＾μ_s、f It can also be based on Y' p、（n＾μ_s、f）-1 Export.

[0139] The second implementation method is generally divided into implementation methods 2-1 to 2-3. The UE / base station can apply any one of implementation methods 2-1 to 2-3, or it can combine at least two of implementation methods 2-1 to 2-3.

[0140] Implementation Method 2-1

[0141] Y' p、n＾μ_s、f Alternatively, it can be based on the initial value corresponding to slot number 0 (e.g., Y'). p、-1 (To decide)

[0142] For example, the UE may also determine the initial value based on parameters that are set / instructed according to at least one method described in Supplement 1 below.

[0143] For example, the UE can also determine the initial value based on a specific RNTI value and at least one of the parameters.

[0144] For example, the UE can also calculate the value obtained by adding / subtracting / multiplying / dividing by the parameter to a specific RNTI value as the initial value.

[0145] For example, the UE can also determine this parameter as the initial value.

[0146] For example, in order to determine the CCE index that will become a PDCCH candidate, the UE can also be set / indicated a specific RNTI. The UE can also determine the initial value based on that specific RNTI value.

[0147] The RNTI (first RNTI) used for calculating PDCCH candidates (CCE indexes that become PDCCH candidates) and the RNTI (second RNTI) used for detecting PDCCH can also be specified separately.

[0148] For example, the first RNTI can be a group-wide RNTI (e.g., G-RNTI, G-CS-RNTI), a new RNTI, or a UE-specific RNTI (e.g., C-RNTI, CS-RNTI). Similarly, the second RNTI can be a UE-specific RNTI (e.g., C-RNTI, CS-RNTI) or a group-wide RNTI (e.g., G-RNTI, G-CS-RNTI).

[0149] For example, the UE can determine the CCE index of the PDCCH candidate based on the first RNTI and perform CRC-scrambled PDCCH detection based on the second RNTI. With this configuration, there is no need to update / reset the RNTI value used during detection, and the position of the PDCCH candidate can be flexibly changed.

[0150] Each of the first RNTI and the second RNTI can be set using higher-level signaling (RRC / MAC CE) or determined based on predefined rules.

[0151] The UE can also be envisioned as having a first RNTI that is publicly assigned to multiple UEs within the cell, and a second RNTI that is not assigned to other UEs within the cell (it is UE-specific).

[0152] The UE can also be envisioned as having a first RNTI that is not assigned to other UEs within the cell (it is UE-specific), and a second RNTI that is publicly assigned to multiple UEs within the cell.

[0153] Implementation Method 2-2

[0154] In addition, Y' p、n＾μ_s、fIt can also be based on items associated with the CORESET index (e.g., A' p (To decide)

[0155] For example, Y' p、n＾μ_s、f It can also be based on A' p *Y' p、（n＾μ_s、f）-1 That's for you to decide.

[0156] For example, the UE may also determine the A' based on parameters that are set / indicated according to at least one of the methods described in Supplement 1 below. p .

[0157] For example, the UE can also determine A' based on the CORESET index and at least one of the parameters. p .

[0158] For example, the UE can also determine A' based on the value obtained by adding / subtracting / multiplying / dividing the CORESET index by this parameter. p .

[0159] For example, the UE can also determine A' by dividing the value of the CORESET index by 3 after adding / subtracting / multiplying / dividing by the parameter. p .

[0160] For example, the UE can also determine this parameter as A' p .

[0161] Implementation Methods 2-3

[0162] In addition, Y' p、n＾μ_s、f It can also be determined based on a specific item (e.g., D').

[0163] For example, Y' p、n＾μ_s、f It can also be defined as A' p *Y' p、（n＾μ_s、f）-1 The remainder obtained by dividing by D' ((A') p *Y' p、（n＾μ_s、f）-1 ) mod D').

[0164] For example, D' can also be a specific value (a fixed value). This specific value can be, for example, 65537, or a value different from 65537.

[0165] For example, the UE may also determine the D' based on at least one of the parameters set / instructed according to at least one method described in Supplement 1 below, and the reported UE capability information.

[0166] For example, the UE may also determine D' based on a specific value (e.g., 65537 or a value other than 65537) and at least one of the parameters.

[0167] For example, the UE can also determine D' based on the value obtained by adding / subtracting / multiplying / dividing the parameter by that specific value.

[0168] When D' is determined based on the value after dividing that particular value by the parameter, values ​​below the decimal point can also be rounded up / rounded down. In other words, D' can also be defined as the output of a floor function / ceiling function for the value after dividing that particular value by the parameter.

[0169] For example, the UE can also determine this parameter as D'.

[0170] According to the second embodiment above, it is possible to export a CCE index that can achieve overlapping of resources for multiple UEs' PDCCH candidates.

[0171] <Changes in the first / second implementation>

[0172] The UE can also assume / determine that it can apply the above implementation methods 1-1 / 1-2 / 2-1 / 2-2 / 2-3 under certain conditions.

[0173] This specific condition can also be at least one of the following:

[0174] • The UE report indicates the UE's ability to support multi-layer PDCCH (PDCCH MIMO) with different UEs.

[0175] • The UE is set / indicated a specific parameter based on at least one of the methods described in Supplement 1 below.

[0176] The UE can also determine / decide to apply the above implementation methods 1-1 / 1-2 / 2-1 / 2-2 / 2-3 on a per UE / per scheduling cell / per scheduling cell (cells scheduled via DCI) / per CORESET / per search space.

[0177] For example, the UE may determine / decide to apply the above implementation method 1-1 / 1-2 / 2-1 / 2-2 / 2-3 to a specific CORESET index, and determine / decide not to apply the above implementation method 1-1 / 1-2 / 2-1 / 2-2 / 2-3 to other CORESETs.

[0178] The UE / base station may also determine which UE / scheduling cell / scheduled cell / CORESET / search space to apply the above implementation methods 1-1 / 1-2 / 2-1 / 2-2 / 2-3 to based on pre-defined specific rules, the reported UE capabilities, and at least one of the methods / parameters / information / signals / channels (e.g., RRC / MAC CE / DCI, etc.) described in Supplement 1 below.

[0179] <Third Implementation Method>

[0180] The third implementation involves changes / instructions / determinations of CCE counts, monitored PDCCH counts, and RNTI values.

[0181] The CCE index can also be determined based on at least one of the CCE count, the number of monitored PDCCHs, and the RNTI value.

[0182] The number of CCEs can also be determined based on the number of frequency resources (e.g., number of RBs) / number of time resources (e.g., number of symbols) of the CORESET.

[0183] The third implementation method is generally divided into implementation methods 3-1 to 3-4. The UE / base station can apply any one of implementation methods 3-1 to 3-4, or it can combine at least two of implementation methods 3-1 to 3-4.

[0184] The instructions in the following embodiments may also be provided using, for example, specific fields / parameters contained in MAC CE / DCI.

[0185] Implementation Method 3-1

[0186] The UE can also update / change / determine the RNTI value based on the received indication information.

[0187] The instruction information may also include at least one of the following:

[0188] • Information indicating which RNTI (e.g., C-RNTI / MCS (Modulation Coding Scheme) - C-RNTI) value is updated / changed / determined.

[0189] • Information / parameters representing the updated / changed values ​​of RNTI.

[0190] The UE can also determine the updated / changed value based on the information / parameters representing the updated / changed value mentioned above:

[0191] For example, the UE may also assume / determine that an RNTI (e.g., the first RNTI mentioned above) set / indicated for determining the CCE index to become a PDCCH candidate is selected, and update / change / determine the RNTI value.

[0192] For example, the UE can also determine the updated / changed value by adding / subtracting / multiplying / dividing the existing (current) value by the notified information / parameter.

[0193] When the updated / changed value is determined based on the value obtained by dividing the existing (current) value by the notified information / parameter, values ​​below the decimal point can also be rounded up / discarded. In other words, the updated / changed value can also be defined as the output of a floor function / ceiling function based on the value obtained by dividing the existing (current) value by the notified information / parameter.

[0194] For example, the UE can also determine the value notified by information / parameters as the updated / changed value.

[0195] Implementation Method 3-2

[0196] The UE can also update / change / determine the number of PDCCHs (PDCCH candidate number) to be monitored based on the received indication information.

[0197] The number of PDCCHs monitored (PDCCH candidate number) can also be the number for each aggregation level.

[0198] The instruction information may also include at least one of the following:

[0199] • Indicates information about which search space the PDCCH candidate number is updated / changed / determined for.

[0200] • Indicates information about which serving cell's PDCCH candidate number is being updated / changed / determined.

[0201] • Indicates information on which aggregation level the PDCCH candidate number is updated / changed / determined.

[0202] • Indicates information on which DCI format PDCCH candidate number is being updated / changed / determined.

[0203] • Information / parameters representing the updated / changed value of the number of PDCCH candidates monitored for each aggregation level.

[0204] For example, the UE can also determine the updated / changed value by adding / subtracting / multiplying / dividing the existing (current) value by the notified information / parameter.

[0205] When the updated / changed value is determined based on the value obtained by dividing the existing (current) value by the notified information / parameter, values ​​below the decimal point can also be rounded up / discarded. In other words, the updated / changed value can also be defined as the output of a floor function / ceiling function based on the value obtained by dividing the existing (current) value by the notified information / parameter.

[0206] For example, the UE can also determine the value notified through information / parameters as the updated / changed value.

[0207] Implementation Method 3-3

[0208] The UE can also update / change / determine at least one of the settings related to CORESET and the settings related to the association between CCE and resource element group (REG) (CCE to REG mapping: CCE to REG mapping) based on the received instruction information.

[0209] The instruction information may also include at least one of the following:

[0210] • This indicates information about which CORESET settings are being updated / changed / determined.

[0211] • This indicates information about which service cell's CORESET settings are being updated / changed / determined.

[0212] • Information / parameters indicating the updated / changed values ​​of CORESET's frequency resources.

[0213] • Information / parameters representing the updated / changed values ​​of CORESET's time resources (e.g., number of symbols).

[0214] • Indicates whether to interleave information / parameters for the association between CCE and REG mappings.

[0215] • Indicates the offset index involved in this interleaving (shiftIndex(n)). shift Information / parameters of updated / changed values.

[0216] • Information / parameters representing the updated / changed value of the interleaver size (R).

[0217] • Information / parameters indicating the updated / changed value of the REG's bundle size (reg-BundleSize(L)).

[0218] • Indicates which parameter / value is being updated / changed.

[0219] For example, the UE can also determine the updated / changed value by adding / subtracting / multiplying / dividing the existing (current) value by the notified information / parameter.

[0220] When the updated / changed value is determined based on the value obtained by dividing the existing (current) value by the notified information / parameter, values ​​below the decimal point can also be rounded up / discarded. In other words, the updated / changed value can also be defined as the output of a floor function / ceiling function based on the value obtained by dividing the existing (current) value by the notified information / parameter.

[0221] For example, the UE can also determine the value notified through information / parameters as the updated / changed value.

[0222] Implementation Methods 3-4

[0223] The UE can also update / change / determine the mapping / association of specific DCI fields (e.g., carrier indicator field (CIF)) with the scheduled serving cell based on the received indication information.

[0224] The instruction information may also include at least one of the following:

[0225] • This indicates information about which scheduling cell the settings are being updated / changed / determined.

[0226] • This indicates information about which scheduled cell the settings are being updated / changed / determined.

[0227] • Information / parameters indicating the updated / changed value of the CIF, which represents the cell specifying the DCI (e.g., (UL) license / (DL) allocation).

[0228] For example, the UE can also determine the updated / changed value by adding / subtracting / multiplying / dividing the existing (current) value by the notified information / parameter.

[0229] When the updated / changed value is determined based on the value obtained by dividing the existing (current) value by the notified information / parameter, values ​​below the decimal point can also be rounded up / discarded. In other words, the updated / changed value can also be defined as the output of a floor function / ceiling function based on the value obtained by dividing the existing (current) value by the notified information / parameter.

[0230] For example, the UE can also determine the value notified through information / parameters as the updated / changed value.

[0231] Furthermore, the indication information for at least two of the embodiments 3-1 to 3-4 described above can use the same MAC CE / DCI or different MAC CE / DCIs. For example, for at least two of the embodiments 3-1 to 3-4 described above, the UE can be updated / changed based on the same MAC CE / DCI or based on different MAC CE / DCIs.

[0232] According to the third embodiment above, by flexibly updating / changing the number of CCEs, the number of monitored PDCCHs, and the RNTI value, it is possible to export a CCE index that can achieve overlapping resources for PDCCH candidates of multiple UEs.

[0233] <Fourth Implementation>

[0234] The fourth implementation involves restrictions / regulations regarding antenna ports and restrictions / regulations among multiple UEs.

[0235] Alternatively, in the existing specifications (up to Rel.17), for a UE, if PDSCH is transmitted while using a specific antenna port, the UE is assumed to be using other antenna ports.

[0236] In other words, the UE can also be envisioned as having antenna ports orthogonal to the antenna ports of the scheduled PDSCH that are not associated with PDSCHs for other UEs.

[0237] Alternatively, when specific RRC parameters (e.g., dmrs-FD-OCC-DisabledForRank1-PDSCH) are set and a single DMRS port is used while PDSCH is scheduled, the UE may envision using different FD-OCC parameters (e.g., sequence elements, w) f The set of orthogonal DMRS antenna ports (i.e., DMRS antenna ports orthogonal via FD-OCC) from the same CDM group (k') is not associated with PDSCHs facing other UEs.

[0238] However, in the reception of multi-layer PDCCH, in order to improve detection accuracy, it is desirable for the UE to detect all ports in the same CDM group. Therefore, if the UE is able to decode X ports, it is desirable to suppress the DMRS ports of all UEs in the CDM group that have been allocated DMRS to less than X ports (Project 4a).

[0239] Furthermore, in the case of multi-level transmission (multi-user (MU-) MIMO) between UEs that support multi-level PDCCH (PDCCH MIMO) and UEs that do not support multi-level PDCCH (PDCCH MIMO), the latter UE is particularly affected by interference (Project 4b).

[0240] Therefore, the methods for solving these problems 4a and 4b (specifically, implementation methods 4-1 and 4-2) will be described below.

[0241] Implementation Method 4-1

[0242] The UE can also be envisioned as having antenna ports orthogonal to the antenna port receiving the PDCCH (the remaining antenna ports) that are not associated with sending PDCCH / PDSCH to other UEs.

[0243] In addition, the UE can also be envisioned that a specific antenna port (the remaining antenna port) orthogonal to the antenna port receiving the PDCCH is not associated with PDCCH / PDSCH transmissions to other UEs.

[0244] This specific antenna port can also be, for example, an antenna port that does not use FDM / TDM / FD-OCC / TD-OCC for DMRS (or, uses FDM / TDM / FD-OCC / TD-OCC for DMRS) and is orthogonal to the antenna port receiving the PDCCH (the remaining antenna port).

[0245] In addition, FDM / TDM / FD-OCC / TD-OCC of DMRS will be described later.

[0246] For example, PDSCH / PDCCH associated with the antenna port that receives PDCCH and the antenna port that is orthogonal to FDM / TDM in DMRS may not be sent to other UEs.

[0247] With this configuration, for example, when using FD-OCC / TD-OCC and multiple UEs' PDCCH DMRS are multiplexed, it is necessary to decode the OCC to estimate the channel of the DMRS port of other UEs. On the other hand, if it is conceivable that the antenna port of other UEs can be used for FDM / TDM with the DMRS, it is also possible to perform channel estimation without decoding the OCC of the DMRS port of other UEs.

[0248] In addition, the UE can also be envisioned that a specific antenna port orthogonal to the antenna port receiving the PDCCH (the remaining specific antenna ports) is not associated with PDCCH / PDSCH transmissions to other UEs.

[0249] This configuration ensures that the use of a specific antenna port is restricted, thereby reducing channel estimation based on the DMRS corresponding to that antenna port.

[0250] A specific antenna port can also be determined based on one or more values ​​related to at least one of the following:

[0251] • The antenna port associated with the received PDCCH.

[0252] • Length of FD-OCC / TD-OCC (sequence length) of DMRS.

[0253] • Use at least one of the parameters that are set / indicated as described in Supplement 1 below.

[0254] • Parameters reported using UE capability information.

[0255] Implementation Method 4-2

[0256] For UEs that support MU-MIMO PDCCH (UEs that support receiving PDCCHs using multiple (two or more) ports / port numbers / port indices), the "other UEs" in the above implementation method 4-1 can also be rewritten as "other UEs that do not support MU-MIMO PDCCH (UEs that can only receive PDCCHs using one port / port number / port index)".

[0257] Furthermore, for UEs that do not support MU-MIMO PDCCH (UEs that can only receive PDCCH using one port / port number / port index), the "other UEs" in the above implementation 4-1 can be rewritten as "other UEs that support MU-MIMO PDCCH (UEs that support receiving PDCCH using multiple (more than two) ports / port numbers / port indexes)" for application.

[0258] Implementation Method 4-3

[0259] The application of at least one operation / limitation described in the above embodiments 4-1 / 4-2 can also be determined based on at least one of the following situations:

[0260] • The UE receives a PDCCH associated with a specific antenna port.

[0261] • The number of ports associated with the received PDCCH is a specific value.

[0262] • The number of ports associated with the received PDCCH is greater than or less than a specific value (above / below the specific value).

[0263] • The number of ports associated with the received PDCCH (DMRS) and in / out of FDM / TDM / FD-OCC / TD-OCC relationships is a specific value.

[0264] • The number of ports associated with the received PDCCH (DMRS) and in / out of an FDM / TDM / FD-OCC / TD-OCC relationship is greater than / less than a specific value (above / below a specific value).

[0265] • When higher-level signaling (RRC / MAC CE) is configured.

[0266] • The situation where the UE supports or does not support a specific capability.

[0267] Additionally, "being in an FDM / TDM / FD-OCC / TD-OCC relationship" can be rewritten as "using FDM / TDM / FD-OCC / TD-OCC and being orthogonal / reused". Furthermore, "not being in an FDM / TDM / FD-OCC / TD-OCC relationship" can be rewritten as "not using FDM / TDM / FD-OCC / TD-OCC and being orthogonal / reused".

[0268] In addition, the specific values ​​in the above conditions can also be determined based on pre-defined rules, parameters of at least one method described in Supplement 1 below, and at least one of the UE capability information reports.

[0269] According to the fourth embodiment above, it is possible to specify that the receiving operation of the PDCCH using a multi-layer / port can be performed appropriately.

[0270] <Fifth Implementation>

[0271] The fifth implementation relates to a demodulation reference signal (DMRS) for a PDCCH using multiple layers / ports.

[0272] In this embodiment, the case of 2 ports / layers is used as the main example for explanation, but the number of layers / ports / ranks is not limited to this. For example, more than 2 ports / layers (e.g., 3, 4, 5, 6, 7, 8, or more) can be specified, and this embodiment can be applied to that port / layer.

[0273] The application of PDCCH DMRS with multiple ports can also be configured per SS / per CORESET / per DL BWP / per UL BWP / per CC / per UE.

[0274] PDCCH DMRS multi-porting can also be implemented using one or more methods. This method can be just one of the following, or it can specify at least two of the following, using higher-level signaling (RRC / MAC CE) / DCI for switching each:

[0275] · FD-OCC.

[0276] · TD-OCC.

[0277] · FD-OCC+TD-OCC.

[0278] FDM.

[0279] · TDM.

[0280] [FD-OCC]

[0281] DMRS (PDCCH DMRS) symbols corresponding to different ports / layers can also be mapped to specific time / frequency resources.

[0282] The mapping method for DMRS can be either based on the methods specified in the existing specifications (up to Rel. 17) or on new rules. For example, the new rule could be at least one of the following: compared to the methods in the existing specifications (e.g., when multiple ports / layers of PDCCH are not set / indicated), the mapping position of DMRS is shifted in the time direction, and the density of DMRS in the frequency direction is increased / decreased.

[0283] At this point, for the DMRS symbol, a frequency domain (FD-) orthogonal overlay code (OCC) can also be applied according to the size of each physical resource block (PRB) / precoding resource group (PRG) / control channel element (CCE) / PRG bundle.

[0284] For this DMRS symbol, different FD-OCC parameters (also known as sequence elements, etc.) can be applied to each different port / layer. f (k).

[0285] Figure 3 This is a diagram illustrating an example of PDCCH DMRS using FD-OCC. Figure 3 An example of a CCE consisting of 14 symbols and 2 PRBs (2*12 subcarriers) is shown. The grid in the time direction represents the symbols, and the grid in the frequency direction represents the subcarriers (the same applies to the figures related to DMRS below).

[0286] exist Figure 3In the example shown, the DMRS using 3 ports (DMRS ports #0 to #2) is mapped in the start symbol, and FD-OCC (FD-OCC parameter W) is applied per PRB (12 subcarriers). f (k)).

[0287] Figure 4 This is a diagram illustrating other examples of PDCCH DMRS applying FD-OCC. Figure 4 In the example shown, DMRS using 6 ports (DMRS ports #0 to #5) is mapped in the start symbol, and FD-OCC (FD-OCC parameter W) is applied per CCE (24 subcarriers). f (k)).

[0288] Figure 5 This is a diagram illustrating other examples of PDCCH DMRS applying FD-OCC. Figure 5 In the example shown, DMRS using two ports (DMRS ports #0 and #1) is mapped in the start symbol, and FD-OCC (FD-OCC parameter W) is applied for each specific number of subcarriers (e.g., 8 subcarriers). f (k)).

[0289] [TD-OCC]

[0290] DMRS (PDCCH DMRS) symbols corresponding to different ports / layers can also be mapped to specific time / frequency resources.

[0291] At this point, time-domain (TD-) OCC can also be applied to the DMRS symbol in a specific time resource unit (e.g., symbol unit).

[0292] In addition, when the repetition of PDCCH is set, TD-OCC can also be applied for each repetition (between repetitions).

[0293] Regarding this repeated transmission, for example, the PDCCH corresponding to the first rank / layer could be transmitted in the first repeated transmission, and the PDCCH corresponding to the second rank / layer could be transmitted in the second repeated transmission (and so on after the third repeated transmission and after the third rank / layer). Alternatively, regarding this repeated transmission, for example, the PDCCH corresponding to multiple rank / layers (e.g., first to nth rank / layers) could be transmitted in each repeated transmission.

[0294] TD-OCC can also be applied when the duration in CORESET is greater than 1.

[0295] For this DMRS symbol, different TD-OCC parameters (also known as sequence elements, etc.) can be applied to each different port / layer. t (k).

[0296] Figure 6 This is a diagram illustrating an example of PDCCH DMRS using TD-OCC. In Figure 6 In the example shown, DMRS is mapped across 3 symbols starting from the start symbol using 3 ports (DMRS ports #0 to #2), and a TD-OCC of length 3 (TD-OCC parameter W) is generated. t (k) is applied to DMRS symbols.

[0297] Figure 7 This is a diagram illustrating other examples of PDCCH DMRS applying TD-OCC. In Figure 7 In the example shown, DMRS is mapped across two symbols starting from the start symbol using two ports (DMRS ports #0 and #2), and a TD-OCC of length 2 (TD-OCC parameter W) is generated. t (k) is applied to DMRS symbols.

[0298] [FD-OCC+TD-OCC]

[0299] The applications of FD-OCC and TD-OCC described above can also be combined.

[0300] DMRS (PDCCH DMRS) symbols corresponding to different ports / layers can also be mapped to specific time / frequency resources.

[0301] At this point, for the DMRS symbol, a frequency domain (FD-) orthogonal overlay code (OCC) can also be applied according to the size of each physical resource block (PRB) / precoding resource group (PRG) / control channel element (CCE) / PRG bundle.

[0302] In addition, time-domain (TD-) OCC can also be applied to this DMRS symbol in a specific time resource unit (e.g., symbol unit).

[0303] For this DMRS symbol, different FD-OCC parameters W can also be applied to each different port / layer. f (k), and the parameters W for different TD-OCCs t (k).

[0304] With this configuration, the receiving side (e.g., the UE) can decode the DMRS more flexibly by using either FD-OCC or TD-OCC. For example, when the channel delay spread is large, the characteristics of FD-OCC degrade; therefore, using TD-OCC to decode the DMRS can be expected to improve its characteristics. Furthermore, when the UE speed is high, the characteristics of TD-OCC degrade; therefore, using FD-OCC to decode the DMRS can be expected to improve its characteristics.

[0305] The UE can also use either FD-OCC or TD-OCC to perform DMRS reception processing based on specific conditions. For example, the UE can use TD-OCC to decode DMRS when a first condition is met (e.g., when the channel delay spread is large), and use FD-OCC to decode DMRS when a second condition is met (e.g., when the UE speed is high).

[0306] Figure 8 This is a diagram illustrating an example of PDCCH DMRS using FD-OCC and TD-OCC. In Figure 8 In the example shown, DMRS using 3 ports (DMRS ports #0 to #2) is mapped across 3 symbols starting from the start symbol in a specific subcarrier, and according to each PRB (12 subcarriers), FD-OCC (FD-OCC parameter W) is used. f (k)) and a TD-OCC of length 3 (TD-OCC parameter W) t (k) are applied to DMRS symbols respectively.

[0307] Figure 9 This is a diagram illustrating other examples of PDCCH DMRS applying FD-OCC and TD-OCC. Figure 9 In the example shown, DMRS using two ports (DMRS ports #0 to #1) is mapped across two symbols starting from the start symbol in a specific subcarrier, and FD-OCC (FD-OCC parameter W) is applied for every specific number of subcarriers (8 subcarriers). f (k)) and a TD-OCC of length 2 (TD-OCC parameter W) t (k) are applied to DMRS symbols respectively.

[0308] [FDM]

[0309] DMRS (PDCCH DMRS) symbols corresponding to different ports / layers can also be frequency-division multiplexed (FDM) (within the same time resource / symbol).

[0310] In this case, it is also possible that a portion of the DMRS is not transmitted, thereby the DMRS symbols corresponding to different ports / layers are FDMed.

[0311] For example, DMRS symbols may be transmitted only for the ports / layers that the UE has configured / indicated. Alternatively, DMRS symbols for ports / layers that the UE has not configured / indicated may not be transmitted.

[0312] Alternatively, for example, DMRS symbols corresponding to one port / layer could be sent to one UE, and DMRS symbols corresponding to another port / layer could be sent to another UE. In this case, the UE may not need to receive the DMRS sent to the other UE. In other words, the UE may ignore the DMRS sent to the other UE (and the DMRS may not be used for channel estimation).

[0313] The UE may also choose not to map PDCCH / other arbitrary DL signals in a portion of resources where DMRS is not transmitted. Alternatively, the UE may choose not to map PDCCH / other arbitrary DL signals in a portion of resources where DMRS is not transmitted.

[0314] The UE can also be envisioned as having its PDCCH mapped in a resource where the DMRS has not been transmitted.

[0315] Compared to the case where FDM is not used, the sequence length of DMRS can remain unchanged, and untransmitted DMRS symbols / REs can also be truncated.

[0316] This configuration allows for the use of longer sequence lengths compared to cases where the sequence length changes, and is therefore appropriate from a particular viewpoint.

[0317] Furthermore, pseudo-random (Pseudo-Random, Pseudo-Noise (PN)) sequences can be mapped only in the DMRS symbols / REs that are actually transmitted. In other words, the sequence length of the DMRS can also vary compared to the case where FDM is not used.

[0318] Figure 10 This is a diagram illustrating an example of PDCCH DMRS using FDM. In Figure 10 In the example shown, the DMRS resources corresponding to each port (p=2000 / 2001 / 2002) are set to FDM. At this time, for the UE corresponding to p=2000, the DMRS / PDCCH (resources) corresponding to p=2001 / 2002 will not be transmitted.

[0319] Figure 11This is a diagram illustrating other examples of PDCCH DMRS applying FDM. In Figure 11 In the example shown, the DMRS resources corresponding to each port (p=2000 / 2001) are set to FDM. At this time, for the UE corresponding to p=2000, the DMRS / PDCCH (resources) corresponding to p=2001 will not be sent.

[0320] [TDM]

[0321] DMRS (PDCCH DMRS) symbols corresponding to different ports / layers can also be time-division multiplexed (TDM) (within the same time resource / symbol).

[0322] In this case, it is also possible that a portion of the DMRS is not transmitted, thereby TDM is used to correspond to DMRS symbols from different ports / layers.

[0323] For example, DMRS symbols may be transmitted only for the ports / layers that the UE has configured / indicated. Alternatively, DMRS symbols for ports / layers that the UE has not configured / indicated may not be transmitted.

[0324] Alternatively, for example, DMRS symbols corresponding to one port / layer could be sent to one UE, and DMRS symbols corresponding to another port / layer could be sent to another UE. In this case, the UE may not need to receive the DMRS sent to the other UE. In other words, the UE may ignore the DMRS sent to the other UE (and the DMRS may not be used for channel estimation).

[0325] The UE may also choose not to map PDCCH / other arbitrary DL signals in a portion of resources where DMRS is not transmitted. Furthermore, the UE may also choose not to map PDCCH / other arbitrary DL signals in a portion of resources where DMRS is not transmitted.

[0326] The UE can also be envisioned as having PDCCH mapped in a portion of the resources where DMRS is not transmitted.

[0327] Compared to not using TDM, the sequence length of DMRS can remain unchanged, and untransmitted DMRS symbols / REs can be truncated.

[0328] This configuration allows for the use of longer sequence lengths compared to cases where the sequence length changes, and is therefore appropriate from a particular viewpoint.

[0329] Furthermore, pseudo-random (PN) sequences can also be mapped only in the DMRS symbols / REs that are actually transmitted. In other words, the sequence length of the DMRS can also vary compared to the case where TDM is not used.

[0330] Figure 12 This is a diagram illustrating an example of PDCCH DMRS using TDM. In Figure 12 In the example shown, the DMRS resources corresponding to each port (p=2000 / 2001 / 2002) are set to TDM. At this time, for the UE corresponding to p=2000, the DMRS / PDCCH (resources) corresponding to p=2001 / 2002 will not be transmitted.

[0331] Figure 13 This is a diagram illustrating other examples of PDCCH DMRS applying TDM. In Figure 13 In the example shown, the DMRS resources corresponding to each port (p=2000 / 2001) are set to TDM. At this time, for the UE corresponding to p=2000, the DMRS / PDCCH (resources) corresponding to p=2001 will not be transmitted.

[0332] According to the fifth embodiment above, it is possible to appropriately specify the use of multiple rank / layer / port PDCCH DMRS, thereby increasing the PDCCH capacity.

[0333] <Supplement>

[0334] [Information notification to UE (Supplement 1)]

[0335] In the above embodiments, any information (notification from the Network (NW) (e.g., Base Station (BS)) to the UE) (in other words, the reception of any information from the BS in the UE) can also be delivered using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PDCCH, PDSCH, reference signals), or combinations thereof.

[0336] In the case where the above notification is made via MAC CE, the MAC CE can also be identified by including a new Logical Channel ID (LCID) that is not specified in the existing standard in the MAC subheader.

[0337] When the above notification is made through a DCI, the notification can also be made through specific fields of the DCI, the Radio Network Temporary Identifier (RNTI) used in the scrambling of the Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0338] Furthermore, the notification of any information to the UE in the above embodiments can also be carried out periodically, semi-persistently, or non-periodically.

[0339] [Notification from UE (Supplement 2)]

[0340] The notification of any information from the UE (to the NW) in the above embodiments (in other words, the transmission / reporting of any information from the UE to the BS) can also be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or combinations thereof.

[0341] In the case where the above notification is made via MAC CE, the MAC CE can also be identified by including a new LCID in the MAC subheader that is not specified in the existing standard.

[0342] In cases where the above notification is sent via UCI, the above notification may also be sent using PUCCH or PUSCH.

[0343] Furthermore, the notification of any information from the UE in the above embodiments can also be carried out periodically, semi-persistently, or non-periodically.

[0344] [Regarding the application of each implementation method (Supplement 3)]

[0345] At least one of the above-described implementation methods can also be applied under certain conditions. These specific conditions can be specified in the standard or communicated to the UE / BS using higher-layer signaling / physical layer signaling.

[0346] At least one of the above-described implementation methods may also be applied only to UEs that have reported a specific UE capability or support that specific UE capability.

[0347] This specific UE capability can also represent at least one of the following:

[0348] • Supports specific processing / operation / control / information for at least one of the above embodiments (e.g., PDCCH reception using multi-layer / port / rank, PDCCH reception in MU-MIMO).

[0349] • Supports reception of PDCCH DMRS using FD-OCC / TD-OCC / FDM / TDM.

[0350] • The number of layers / ports / ranks of the supported PDCCH / DMRS.

[0351] Furthermore, the aforementioned specific UE capabilities can be capabilities that apply across all frequencies (frequency-independent and common), capabilities that apply to each frequency (e.g., one or a combination of cells, bands, band combinations, BWPs, component carriers, etc.), capabilities that apply to each frequency range (e.g., Frequency Range 1 (FR1)), FR2, FR3, FR4, FR5, FR2-1, FR2-2), capabilities that apply to each subcarrier spacing (SCS) or capabilities that apply to each feature set (FS) or each feature set per component carrier (FSPC).

[0352] Furthermore, the aforementioned specific UE capabilities can be either capabilities that apply to all duplex modes (commonly regardless of the duplex mode) or capabilities that apply to each duplex mode (e.g., Time Division Duplex (TDD) and Frequency Division Duplex (FDD)).

[0353] Furthermore, at least one of the above-described embodiments can also be applied when the UE is set / activated / triggered by specific information associated with the above-described embodiments (or the operation of the above-described embodiments is performed) via higher-layer signaling / physical layer signaling. For example, this specific information may be information indicating activation of reception using multi-layer / port / rank PDCCH, arbitrary RRC parameters for a specific version (e.g., Rel.18 / 19), etc.

[0354] The UE may also apply Rel.15 / 16 operations if it does not support at least one of the above-mentioned specific UE capabilities or if the above-mentioned specific information is not set.

[0355] (Note A)

[0356] With respect to one embodiment of this disclosure, the following invention is noted.

[0357] [Note A-1]

[0358] The terminal has:

[0359] The control unit determines the CCE index based on a first derivation method related to the control channel element (CCE) index corresponding to candidates of physical downlink control channels (PDCCH) using multiple layers, wherein the first derivation method differs from a second derivation method, and the second derivation method is related to the CCE index corresponding to candidates of PDCCH using one layer; and

[0360] The receiving unit monitors the PDCCH using the multiple layers based on the CCE index.

[0361] [Note A-2]

[0362] The terminal described in Appendix A-1,

[0363] The first parameter based on the time slot number in the first export method is different from the second parameter based on the time slot number in the second export method.

[0364] [Note A-3]

[0365] The terminal described in Appendix A-1 or Appendix A-2,

[0366] The first parameter based on the time slot number in the first derivation method is determined based on a specific initial value, which is different from the value of a specific Radio Network Temporary Identifier (RNTI).

[0367] [Note A-4]

[0368] The terminal described in any one of Notes A-1 to A-3,

[0369] In the first export method, the first parameter based on the time slot number is based on the value of a specific Radio Network Temporary Identifier (RNTI), and the control unit determines the update of the value of the specific RNTI based on specific indication information.

[0370] (Note B)

[0371] With respect to one embodiment of this disclosure, the following invention is noted.

[0372] [Note B-1]

[0373] The terminal has:

[0374] The control unit determines a specific antenna port orthogonal to the first antenna port for receiving the Physical Downlink Control Channel (PDCCH) used for multiple layers; and

[0375] The receiving unit is designed so that the specific antenna port is not associated with the Physical Downlink Shared Channel (PDSCH) and PDCCH for specific other terminals, and receives the PDCCH of the multiple layers.

[0376] [Note B-2]

[0377] The terminal described in Appendix B-1,

[0378] The specific antenna port is an antenna port other than the first antenna port that is orthogonal to the first antenna port.

[0379] [Note B-3]

[0380] The terminal described in Appendix B-1 or Appendix B-2,

[0381] The specific antenna port is an antenna port orthogonal to the first antenna port, which is used for the demodulation reference signal of the PDCCH and employs frequency division multiplexing, time division multiplexing, frequency domain orthogonal coverage code, time domain orthogonal coverage code, or frequency domain and time domain orthogonal coverage code.

[0382] [Note B-4]

[0383] The terminal described in any of Notes B-1 to B-3,

[0384] The specific other terminals are those that are able to receive PDCCH using only one layer.

[0385] (Wireless communication system)

[0386] The structure of a wireless communication system according to one embodiment of this disclosure will now 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 this disclosure.

[0387] Figure 14This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment. The wireless communication system 1 (also referred to simply as System 1) may also be a system that uses Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) as standardized by the Third Generation Partnership Project (3GPP) to achieve communication.

[0388] Furthermore, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also 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)), etc.

[0389] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0390] Wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (e.g., MN and SN are dual connectivity between NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0391] The wireless communication system 1 may also include a base station 11 forming a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a-12c) configured within the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration and number of each cell and the user terminal 20 are not limited to the arrangement shown in the figure. Hereinafter, without distinguishing between base stations 11 and 12, they will be collectively referred to as base station 10.

[0392] User terminal 20 may also connect to at least one of multiple base stations 10. User terminal 20 may also utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0393] Each CC can also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). Macro cell C1 can also be included in FR1, and small cell C2 can also be included in FR2. For example, FR1 can also be a frequency band below 6 GHz (sub-6 GHz), and FR2 can also be a frequency band above 24 GHz (above-24 GHz). In addition, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these; for example, FR1 can also be equivalent to a frequency band higher than FR2.

[0394] In addition, in each CC, the user terminal 20 may also use at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) for communication.

[0395] Multiple base stations 10 can also be connected via wired (e.g., fiber optic cable based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is equivalent to a host station, can also be referred to as an Integrated Access Backhaul (IAB) donor, and base station 12, which is equivalent to a relay station, can also be referred to as an IAB node.

[0396] Base station 10 may also be connected to core network 30 via other base stations 10 or directly. Core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0397] The core network 30 may also include, for example, user plane functions (UPF), access and mobility management functions (AMF), session management functions (SMF), unified data management (UDM), application functions (AF), data network (DN), location management functions (LMF), and network functions (NF) such as operation, administration and maintenance (OAM). Alternatively, multiple functions can be provided through a single network node. Furthermore, communication with external networks (e.g., the Internet) can also be achieved via the DN.

[0398] User terminal 20 can also be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0399] In wireless communication system 1, wireless access methods based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the downlink (DL) and uplink (UL) links, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA) can also be used.

[0400] The wireless access method can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used in the wireless access methods of UL and DL.

[0401] In the wireless communication system 1, the downlink channel can also be a shared downlink channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), or a downlink control channel (Physical Downlink Control Channel (PDCCH)) shared by each user terminal 20.

[0402] In addition, in the wireless communication system 1, the uplink channel can also be the shared uplink channel (Physical Uplink Shared Channel (PUSCH)), the uplink control channel (Physical Uplink Control Channel (PUCCH)), the random access channel (Physical Random Access Channel (PRACH)) shared by each user terminal 20, etc.

[0403] User data, high-level control information, and System Information Blocks (SIBs) are transmitted via the PDSCH. User data and high-level control information can also be transmitted via the PUSCH. In addition, Master Information Blocks (MIBs) can also be transmitted via the PBCH.

[0404] Lower-layer control information can also be transmitted via PDCCH. This lower-layer control information may include, for example, downlink control information (DCI), which includes scheduling information for at least one of PDSCH and PUSCH.

[0405] Additionally, the DCI that schedules PDSCH can also be called DL allocation, DL DCI, etc., and the DCI that schedules PUSCH can also be called UL authorization, UL DCI, etc. Furthermore, PDSCH can be rewritten as DL data, and PUSCH can be rewritten as UL data.

[0406] In PDCCH detection, a Control Resource Set (CORESET) and a search space can also be utilized. A CORESET corresponds to the resources used to search for DCIs. The search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor CORESETs associated with a specific search space based on search space settings.

[0407] A search space can also correspond to one or more PDCCH candidates equivalent to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the terms "search space", "search space set", "search space setting", "search space set setting", "CORESET", and "CORESET setting" in this disclosure can be rewritten interchangeably.

[0408] The PUCCH can also transmit uplink control information (uplink control information (UCI)) that includes at least one of the following: Channel State Information (CSI), delivery confirmation information (e.g., also known as Hybrid Automatic Repeat Request ACK Knowledge (HARQ-ACK), ACK / NACK, etc.), and Scheduling Request (SR). The PRACH can also transmit random access preambles used for establishing connections with the cell.

[0409] In addition, in this disclosure, downlink, uplink, etc., may be described without the word "link". Furthermore, various channels may be described without the word "physical".

[0410] In wireless communication system 1, synchronization signals (SS) and downlink reference signals (DL-RS) can also be transmitted. In wireless communication system 1, DL-RS can also transmit cell-specific reference signals (CRS), channel state information reference signals (CSI-RS), demodulation reference signals (DMRS), positioning reference signals (PRS), and phase tracking reference signals (PTRS).

[0411] Synchronization signals can be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be called an SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. can also be called reference signals.

[0412] Furthermore, in wireless communication system 1, the uplink reference signal (UL-RS) can also transmit measurement reference signals (sounding reference signals (SRS)) and demodulation reference signals (DMRS). Additionally, DMRS can also be referred to as user terminal-specific reference signals (UE-specific reference signals).

[0413] (Base station)

[0414] Figure 15 This diagram illustrates an example of the structure of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmit / receive unit 120, a transmit / receive antenna 130, and a transmission path interface (transmission line interface) 140. Alternatively, the control unit 110, the transmit / receive unit 120, the transmit / receive antenna 130, and the transmission path interface 140 may each be provided in more than one manner.

[0415] Furthermore, while this example primarily illustrates the functional blocks of the characteristic portions of this embodiment, it is also conceivable that the base station 10 may also possess other functional blocks required for wireless communication. A portion of the processing of each unit described below may also be omitted.

[0416] The control unit 110 performs overall control of the base station 10. The control unit 110 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the art to which this disclosure pertains.

[0417] The control unit 110 can also control signal generation and scheduling (e.g., resource allocation, mapping). The control unit 110 can also control transmission, reception, and measurement using the transmit / receive unit 120, transmit / receive antenna 130, and transmission path interface 140. The control unit 110 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmit / receive unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of the communication channel, status management of the base station 10, and management of wireless resources.

[0418] The transmitting / receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting / receiving unit 120 may be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0419] The transmitting and receiving unit 120 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 1211 and an RF unit 122. The receiving unit can also be composed of a receiving processing unit 1212, an RF unit 122, and a measurement unit 123.

[0420] The transmitting and receiving antenna 130 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0421] The transmitting / receiving unit 120 can also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 can also receive the aforementioned uplink channel, uplink reference signal, etc.

[0422] The transmitting and receiving unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0423] The transmitting and receiving unit 120 (transmitting processing unit 1211) may, for example, perform processing at the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer (e.g., RLC retransmission control), and Medium Access Control (MAC) layer (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0424] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), Discrete Fourier Transform (DFT) processing (as needed), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output the baseband signal.

[0425] The transmitting and receiving unit 120 (RF unit 122) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 130.

[0426] On the other hand, the transmitting and receiving unit 120 (RF unit 122) can also amplify, filter, and demodulate the signals of the wireless frequency band received through the transmitting and receiving antenna 130 into the baseband signal.

[0427] The transmitting and receiving unit 120 (receiving and processing unit 1212) can also perform receiving and processing on the acquired baseband signal, including analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to obtain user data.

[0428] The transmitting / receiving unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc., based on the received signal. The measurement unit 123 can also 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 can also be output to the control unit 110.

[0429] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between the device included in the core network 30 (e.g., the network node providing the NF), other base stations 10, etc., and can also acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0430] In addition, the transmitting unit and receiving unit of the base station 10 in this disclosure may also be composed of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0431] Control unit 110 may also use a first derivation method related to the control channel element (CCE) index corresponding to the candidate physical downlink control channel (PDCCH) using multiple layers to indicate the CCE index. Alternatively, the first derivation method may differ from the second derivation method, where the second derivation method is related to the CCE index corresponding to the candidate PDCCH using one layer. Transmit / receive unit 120 may also use the CCE index to transmit PDCCH using the multiple layers (first embodiment).

[0432] The control unit 110 may also indicate a specific antenna port orthogonal to the first antenna port for receiving the Physical Downlink Control Channel (PDCCH) for multiple layers. The transmit / receive unit 120 may also transmit the PDCCH of the multiple layers without associating the specific antenna port with the Physical Downlink Shared Channel (PDSCH) and PDCCH for specific other terminals (fourth embodiment).

[0433] (User terminal)

[0434] Figure 16 This diagram illustrates an example of the structure of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Alternatively, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be included.

[0435] Furthermore, while this example primarily illustrates the functional blocks of the characteristic portions of this embodiment, it is also conceivable that the user terminal 20 may also have other functional blocks required for wireless communication. Some of the processing of each unit described below may also be omitted.

[0436] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the technical field to which this disclosure pertains.

[0437] The control unit 210 can also control signal generation, mapping, etc. The control unit 210 can also control transmission, reception, measurement, etc., using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmission / reception unit 220.

[0438] The transmitting / receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting / receiving unit 220 may be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0439] The transmitting and receiving unit 220 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit can also be composed of a receiving processing unit 2212, an RF unit 222, and a measurement unit 223.

[0440] The transmitting and receiving antenna 230 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0441] The transmitting / receiving unit 220 can also receive the downlink channel, synchronization signal, downlink reference signal, etc., mentioned above. The transmitting / receiving unit 220 can also transmit the uplink channel, uplink reference signal, etc., mentioned above.

[0442] The transmitting and receiving unit 220 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0443] The transmitting and receiving unit 220 (transmitting processing unit 2211) may, for example, perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 210, and generate the bit string to be transmitted.

[0444] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output the baseband signal.

[0445] Furthermore, whether or not to apply DFT processing can be based on the transform precoding settings. For a certain channel (e.g., PUSCH), if transform precoding is enabled, the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as described above for transmitting the channel using the DFT-s-OFDM waveform; otherwise, the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as described above for transmitting the channel without performing DFT processing.

[0446] The transmitting and receiving unit 220 (RF unit 222) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 230.

[0447] On the other hand, the transmitting and receiving unit 220 (RF unit 222) can also amplify, filter, demodulate, etc., the signals of the wireless frequency band received by the transmitting and receiving antenna 230.

[0448] The transmitting and receiving unit 220 (receiving and processing unit 2212) can also perform receiving and processing on the acquired baseband signal, such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to obtain user data.

[0449] The transmitting / receiving unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can also perform RRM measurements, CSI measurements, etc., based on the received signal. The measurement unit 223 can also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 210.

[0450] Additionally, the measurement unit 223 can also derive channel measurements for CSI calculation based on channel measurement resources. Channel measurement resources can be, for example, non-zero power (NZP) CSI-RS resources. Furthermore, the measurement unit 223 can also derive interference measurements for CSI calculation based on interference measurement resources. Interference measurement resources can be at least one of NZP CSI-RS resources for interference measurement, CSI-Interference Measurement (IM) resources, etc. Additionally, CSI-IM can also be referred to as CSI-Interference Management (IM), and can be interchanged with zero power (ZP) CSI-RS. Furthermore, in this disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc., can also be interchanged.

[0451] Alternatively, the transmitting and receiving units of the user terminal 20 in this disclosure may also be composed of at least one transmitting / receiving unit 220 and transmitting / receiving antenna 230.

[0452] Control unit 210 may also determine the CCE index based on a first derivation method relating to the control channel element (CCE) index corresponding to a candidate physical downlink control channel (PDCCH) using multiple layers. Alternatively, the first derivation method may differ from the second derivation method, where the second derivation method relates to the CCE index corresponding to a candidate PDCCH using one layer. Transmit / receive unit 220 may also monitor the PDCCH using the multiple layers based on the CCE index.

[0453] The first parameter based on the time slot number in the first export method may also be different from the second parameter based on the time slot number in the second export method (first embodiment).

[0454] The first parameter based on the time slot number in the first derivation method can also be determined based on a specific initial value. The specific initial value can also be different from the value of a specific Radio Network Temporary Identifier (RNTI) (second embodiment).

[0455] The first parameter based on the time slot number in the first derivation method can also be based on the value of a specific Radio Network Temporary Identifier (RNTI). The control unit 210 can also determine the update of the value of the specific RNTI based on specific indication information (third embodiment).

[0456] The control unit 210 can also determine a specific antenna port orthogonal to the first antenna port for receiving the Physical Downlink Control Channel (PDCCH) for multiple layers. The transmit / receive unit 220 can also be conceived as receiving the PDCCH of the multiple layers without being associated with the Physical Downlink Shared Channel (PDSCH) and PDCCH for a specific other terminal (fourth embodiment).

[0457] The specific antenna port can also be an antenna port other than the first antenna port that is orthogonal to the first antenna port (fourth embodiment).

[0458] The specific antenna port can also be a demodulation reference signal for the PDCCH, using frequency division multiplexing, time division multiplexing, frequency domain orthogonal coverage code, time domain orthogonal coverage code, or frequency domain and time domain orthogonal coverage code, and an antenna port orthogonal to the first antenna port (fourth embodiment).

[0459] The specific other terminal may also be another terminal that can receive PDCCH using only one layer (fourth embodiment).

[0460] (Hardware structure)

[0461] Furthermore, the block diagrams used in the description of the above embodiments illustrate functional units. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Moreover, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented using a single device that is physically or logically combined, or it can be implemented by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. A functional block can also be implemented by combining the aforementioned single device or multiple devices with software.

[0462] Here, the functions include judgment, decision, determination, calculation, calculation, processing, export, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, regard as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, a functional block (structural unit) that implements the sending function can also be called a transmitting unit, transmitter, etc. As described above, the implementation method of any of them is not particularly limited.

[0463] For example, in one embodiment of this disclosure, the base station, user terminal, etc., can also function as a computer for processing the wireless communication method of this disclosure. Figure 17 This is a diagram illustrating an example of the hardware structure of a base station and a user terminal according to one embodiment. The base station 10 and the user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0464] Furthermore, in this disclosure, terms such as apparatus, circuit, device, section, and unit can be interchanged. The hardware structure of base station 10 and user terminal 20 can be configured to include one or more of the apparatuses shown in the figures, or it can be configured not to include any of the apparatuses.

[0465] For example, only one processor 1001 is shown, but there can be multiple processors. Furthermore, processing can be performed by one processor, or simultaneously, sequentially, or by two or more processors using other methods. Additionally, processor 1001 can be implemented using more than one chip.

[0466] The functions of the base station 10 and the user terminal 20 are implemented, for example, by reading specific software (programs) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage device 1003.

[0467] The processor 1001, for example, enables the operating system to operate and control the computer as a whole. The processor 1001 may also be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic devices, registers, etc. For example, at least a portion of the control unit 110 (210), the transmit / receive unit 120 (220), etc., described above may also be implemented by the processor 1001.

[0468] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001; similar implementations can be made for other functional blocks.

[0469] The memory 1002 may also be a computer-readable recording medium, such as being composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 is capable of storing executable programs (program code), software modules, etc., for implementing the wireless communication method according to an embodiment of this disclosure.

[0470] Storage device 1003 may also be a computer-readable recording medium, such as a flexible disc, floppy disk, optical disk (e.g., compact disc ROM, CD-ROM), digital multifunction disk, Blu-ray disc, removable disk, hard disk, smart card, flash memory device (e.g., card, stick, key drive), stripe, database, server, or at least one other suitable storage medium. Storage device 1003 may also be referred to as an auxiliary storage device.

[0471] The communication device 1004 is hardware (transmitting and receiving device) used for communication between computers via at least one of a wired network and a wireless network. It is also referred to as a network device, network controller, network interface card (NIC), communication module, etc. To implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the aforementioned transmit / receive unit 120 (220) and transmit / receive antenna 130 (230) may also be implemented by the communication device 1004. The transmit / receive unit 120 (220) may also be implemented by physically or logically separating the transmit unit 120a (220a) and the receive unit 120b (220b).

[0472] Input device 1005 is an input device that receives input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, light-emitting diode (LED) lamp, etc.). Alternatively, input device 1005 and output device 1006 can also be an integrated structure (e.g., a touch panel).

[0473] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 can be configured as a single bus or as different buses between the devices.

[0474] Furthermore, the base station 10 and the user terminal 20 can also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field-programmable gate array (FPGA), and can also use this hardware to implement part or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0475] (Modified example)

[0476] Furthermore, the terms described in this disclosure, as well as those necessary for understanding this disclosure, may be replaced with terms that have the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be interchanged. Additionally, a signal may also be a message. A reference signal can also be abbreviated as RS, and may be referred to as pilot, pilot signal, etc., depending on the applied standard. Furthermore, a component carrier (CC) may also be referred to as cell, frequency carrier, carrier frequency, etc.

[0477] A radio frame can also be composed of one or more periods (frames) in the time domain. Each of these periods (frames) that constitute a radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) independent of the parameter set (numerology).

[0478] Here, the parameter set can also be communication parameters applied in at least one of the transmission and reception of a signal or channel. For example, the parameter set can also represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0479] In the time domain, a time slot can also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.). In addition, a time slot can also be a time unit based on a set of parameters.

[0480] A time slot can also contain multiple mini-time slots. Each mini-time slot can also consist of one or more symbols in the time domain. Furthermore, a mini-time slot can also be called a sub-time slot. A mini-time slot can also consist of fewer symbols than a time slot. PDSCH (or PUSCH) transmitted in a time unit larger than a mini-time slot can also be called PDSCH (PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using mini-time slots can also be called PDSCH (PUSCH) mapping type B.

[0481] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols can also use their respective other names. Furthermore, the time units such as frames, subframes, time slots, mini-time slots, and symbols in this disclosure can be interchanged.

[0482] For example, a subframe can also be called a TTI, multiple consecutive subframes can also be called a TTI, and a time slot or a mini-time slot can also be called a TTI. That is, at least one of a subframe and a TTI can be a subframe in existing LTE (1ms), a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. In addition, the unit representing TTI may not be called a subframe, but rather a time slot, mini-time slot, etc.

[0483] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules radio resources (frequency bandwidth, transmit power, etc., available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0484] TTI can also be a unit of time for transmitting channel-coded data packets (transmission blocks), code blocks, codewords, etc., and can also be a unit of processing such as scheduling and link adaptation. In addition, when a TTI is given, the actual time interval (e.g., the number of symbols) mapped to transmission blocks, code blocks, codewords, etc. can be shorter than the TTI.

[0485] Additionally, where a time slot or a mini-time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini-time slot) can also be the minimum time unit for scheduling. Furthermore, the number of time slots (mini-time slots) constituting the minimum time unit of the schedule can also be controlled.

[0486] A TTI with a duration of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI can also 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 time slot, a sub-time slot, a time slot, etc.

[0487] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can also be rewritten as a TTI with a duration of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be rewritten as a TTI with a duration of less than a long TTI but more than 1 ms.

[0488] A resource block (RB) is a unit of resource allocation in both the time and frequency domains. In the frequency domain, it can also contain one or more consecutive subcarriers. The number of subcarriers in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers in an RB can also be determined based on the parameter set.

[0489] Furthermore, an RB can contain one or more symbols in the time domain, and can also be a time slot, a mini-time slot, a subframe, or the length of a TTI. A TTI, a subframe, etc., can also be composed of one or more resource blocks.

[0490] In addition, one or more RBs can also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0491] In addition, a resource block can also consist of one or more resource elements (REs). For example, an RE can also be a radio resource area consisting of a subcarrier and a symbol.

[0492] The Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) can also represent a subset of consecutive common resource blocks (RBs) used for a certain parameter set in a carrier. Here, common RBs can also be determined by the index of RBs based on the common reference point of the carrier. PRBs can also be defined in a BWP and appended with numbers within that BWP.

[0493] A BWP can also include a UL BWP (the BWP used by UL) and a DL BWP (the BWP used by DL). For a UE, one or more BWPs can also be set within a single carrier.

[0494] At least one of the configured BWPs can be active, and the UE may not intend to transmit or receive specific signals / channels outside of the active BWPs. Furthermore, the terms "cell," "carrier," etc., in this disclosure can be rewritten as "BWP."

[0495] Furthermore, the structures described above, such as radio frames, subframes, time slots, mini-time slots, and symbols, are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in many ways.

[0496] Furthermore, the information, parameters, etc., described in this disclosure can be represented by absolute values, relative values ​​with respect to a specific value, or other corresponding information. For example, wireless resources can also be indicated by a specific index.

[0497] In this disclosure, the names used for parameters, etc., are not limiting names in any respect. Furthermore, the mathematical expressions, etc., using these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name; therefore, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0498] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0499] Furthermore, information, signals, etc., can be output in at least one of the following directions: from higher level (upper layer) to lower level (lower layer), and from lower layer to higher level. Information, signals, etc., can also be input and output via multiple network nodes.

[0500] Input and output information, signals, etc., can be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc., can be overwritten, updated, or appended. Output information, signals, etc., can also be deleted. Input information, signals, etc., can also be sent to other devices.

[0501] The notification of information is not limited to the methods / implementations described in this disclosure, and may also be carried out by other methods. For example, the notification of information in this disclosure may also be implemented by physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI), etc.), higher 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 combinations thereof.

[0502] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. Furthermore, RRC signaling can also be referred to as RRC messages, such as RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. Additionally, MAC signaling can also be notified using, for example, a MAC Control Element (CE).

[0503] Furthermore, notification of specific information (e.g., a notification of “is X”) is not limited to explicit notification, but can also be implicit (e.g., by not providing that specific information, or by providing other information).

[0504] The determination can be made by a value represented by a single bit (0 or 1), by a true or false value (boolean), or by a numerical comparison (e.g., a comparison with a specific value).

[0505] Whether software is called software, firmware, middleware, microcode, hardware description language, or any other name, it should be broadly interpreted to refer to 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.

[0506] Furthermore, software, instructions, and information can also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL) etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0507] The terms “system” and “network” as used in this disclosure are interchangeable. “Network” may also mean devices included in a network (e.g., base stations).

[0508] In this disclosure, the terms “precoding”, “precoder”, “weight (precoding weight)”, “quasi-co-location (QCL)”, “transmission configuration indication state (TCI state)”, “spatial relation”, “spatial domain filter”, “transmit power”, “phase rotation”, “antenna port”, “layer”, “number of layers”, “rank”, “resource”, “resource set”, “beam”, “beamwidth”, “beam angle”, “antenna”, “antenna element”, “panel”, “UE panel”, “transmitting entity”, and “receiving entity” are used interchangeably.

[0509] Furthermore, in this disclosure, the antenna port can also be rewritten with an antenna port used for any signal / channel (e.g., a DeModulation Reference Signal (DMRS) port). In this disclosure, resources can also be rewritten with resources used for any signal / channel (e.g., reference signal resources, SRS resources, etc.). Additionally, resources can also include time / frequency / code / spatial / power resources. Moreover, the spatial domain transmission filter can also include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0510] The aforementioned groups may include, for example, at least one of the following: spatial relation group, code division multiplexing (CDM) group, reference signal (RS) group, control resource set (CORESET) group, PUCCH group, antenna port group (e.g., DMRS port group), layer group, resource group, beam group, antenna group, panel group, etc.

[0511] Furthermore, in this disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, Codeword (CW), Transport Block (TB), RS, etc., can also be rewritten to each other.

[0512] Furthermore, in this disclosure, the TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, and joint TCI state can also be rewritten to each other.

[0513] Furthermore, in this disclosure, terms such as "QCL", "QCL concept", "QCL relationship", "QCL type information", "QCL property (QCLproperty / properties)", "specific QCL type (e.g., type A, type D) property", and "specific QCL type (e.g., type A, type D)" can be rewritten interchangeably.

[0514] In this disclosure, indexes, identifiers (IDs), indicators, indications, resource IDs, etc., can also be interchanged. In this disclosure, sequences, lists, sets, groups, clusters, subsets, etc., can also be interchanged.

[0515] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) can be interchanged. "Spatial relationship information (TCI state)" can also be interchanged with "a set of spatial relationship information (TCI states)," "one or more spatial relationship information," etc. TCI state and TCI can also be interchanged. Spatial relationship information and spatial relationship can also be interchanged.

[0516] In this disclosure, the terms "Base Station (BS)", "Wireless 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", and "Component Carrier" are used interchangeably. There are also instances where the terms macro cell, small cell, femtocell, and picocell are used to refer to a base station.

[0517] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0518] In this disclosure, the information sent by the base station to the terminal can also be rewritten with the control / operation instructed by the base station to the terminal based on that information.

[0519] In this disclosure, the terms “Mobile Station (MS)”, “user terminal”, “user equipment (UE)”, and “terminal” are used interchangeably.

[0520] There are also instances where mobile stations are referred to as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, handsets, user agents, mobile clients, clients, or several other appropriate terms.

[0521] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Additionally, at least one of the base station and the mobile station can also be a device mounted on a moving object, the moving object itself, etc.

[0522] The term "mobile body" refers to a movable object whose speed is arbitrary, including situations where the body is stationary. Examples of such mobile bodies include vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, loading shovels, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, trolleys, rickshaws, ships (including vessels and other watercraft), airplanes, rockets, satellites, drones, multi-rotor aircraft, quadcopters, balloons, and objects carried on them, but are not limited to these. Furthermore, the mobile body can also be a mobile body that moves autonomously based on operational commands.

[0523] The mobile entity can be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile entity moving in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Additionally, at least one of the base station and the mobile station may include a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0524] Figure 18 This figure illustrates an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a gear shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a speed sensor 51, a pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a gear shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0525] The drive unit 41 is comprised of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is configured to include at least a steering wheel (also called a handlebar) and to perform directional control on at least one of the front wheel 46 and the rear wheel 47 based on the operation of the steering wheel by the user.

[0526] The electronic control unit 49 consists of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (e.g., an input / output (IO) port) 63). Signals from various sensors 50-58 present in the vehicle are input into the electronic control unit 49. The electronic control unit 49 can also be referred to as an ECU (Electronic Control Unit).

[0527] The signals from various sensors 50-58 include current signals from current sensor 50 that senses the current of the motor, speed signals from front wheel 46 / rear wheel 47 obtained by speed sensor 51, air pressure signals from front wheel 46 / rear wheel 47 obtained by air pressure sensor 52, vehicle speed signals obtained by vehicle speed sensor 53, acceleration signals obtained by acceleration sensor 54, accelerator pedal 43 depress amount signals obtained by accelerator pedal sensor 55, brake pedal 44 depress amount signals obtained by brake pedal sensor 56, shift lever 45 operation signals obtained by shift lever sensor 57, and detection signals obtained by object detection sensor 58 for detecting obstacles, vehicles, pedestrians, etc.

[0528] The information service unit 59 comprises various devices such as a vehicle navigation system, audio system, speakers, display, television, and radio, used to provide (output) various information such as driving information, traffic information, and entertainment information, as well as one or more ECUs that control these devices. The information service unit 59 uses information obtained from external devices via the communication module 60, etc., to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0529] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) or output devices that implement output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0530] The driver assistance system unit 64 comprises various devices used to provide functions for preventing accidents and reducing the driver's workload, such as millimeter-wave radar, light detection and ranging (LiDAR), cameras, positioning devices (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyroscope systems (e.g., Inertial Measurement Unit (IMU)), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. Furthermore, the driver assistance system unit 64 sends and receives various information via a communication module 60 and implements driver assistance or autonomous driving functions.

[0531] The communication module 60 can communicate with the microprocessor 61 and the structural elements of the vehicle 40 via the communication port 63. For example, the communication module 60 sends and receives data (information) between the microprocessor 61 and the memory (ROM, RAM) 62, and various sensors 50-58 in the drive unit 41, steering control unit 42, accelerator pedal 43, brake pedal 44, gear shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, and electronic control unit 49 of the vehicle 40 via the communication port 63.

[0532] The communication module 60 is controlled by the microprocessor 61 of the electronic control unit 49 and is a communication device capable of communicating with external devices. For example, it can transmit and receive various types of information between external devices via wireless communication. The communication module 60 can be located either inside or outside the electronic control unit 49. The external device can be, for example, the aforementioned base station 10, user terminal 20, etc. Furthermore, the communication module 60 can be, for example, at least one of the aforementioned base station 10 and user terminal 20 (or it can function as at least one of the base station 10 and user terminal 20).

[0533] The communication module 60 can also wirelessly transmit at least one of the following to an external device: signals from the various sensors 50-58 described above that are input to the electronic control unit 49, information obtained based on these signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., can also be referred to as input units that receive input. For example, the PUSCH transmitted via the communication module 60 can also contain information based on the aforementioned input.

[0534] The communication module 60 receives various information (traffic information, traffic light information, vehicle-to-vehicle information, etc.) sent from external devices and displays it to the information service unit 59 provided by the vehicle. The information service unit 59 can also be referred to as an output unit that outputs information (for example, outputs information to devices such as displays and speakers based on the PDSCH received through the communication module 60 (or data / information decoded from the PDSCH).

[0535] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. The microprocessor 61 can also control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, gear shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, and various sensors 50-58 of the vehicle 40 based on the information stored in the memory 62.

[0536] Furthermore, the base station in this disclosure can also be rewritten as a user terminal. For example, various methods / implementations of this disclosure can be applied to structures where communication between the base station and the user terminal is replaced by communication between multiple user terminals (e.g., also referred to as device-to-device (D2D) or vehicle-to-everything (V2X)). In this case, it can also be configured such that the user terminal 20 has the functions of the base station 10 described above. In addition, terms such as "uplink" and "downlink" can be rewritten as terms corresponding to inter-terminal communication (e.g., "sidelink"). For example, uplink channel, downlink channel, etc., can also be rewritten as sidelink channel.

[0537] Similarly, the user terminal in this disclosure can also be rewritten as a base station. In this case, it can also be configured such that the base station 10 has the functions of the user terminal 20 described above.

[0538] In this disclosure, operations are assumed to be performed by the base station, and sometimes, depending on the circumstances, by its upper node. Clearly, in a network containing one or more network nodes having a base station, various operations for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (e.g., considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or combinations thereof.

[0539] The various methods / implementations described in this disclosure can be used individually or in combination, and can be switched as needed during execution. Furthermore, the processing procedures, timing sequences, flowcharts, etc., of the various methods / implementations described in this disclosure can be rearranged as long as they do not contradict each other. For example, for the method described in this disclosure, the illustrated order is used to indicate various steps, but the order in which they are indicated is not limited.

[0540] The various methods / implementations described in this disclosure can also be applied to 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), Futuregeneration radio access (FX), Global System for Mobile Communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE This includes 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-Wideband (UWB)), Bluetooth (registered trademark), systems utilizing other suitable wireless communication methods, and next-generation systems derived from enhancements, modifications, creations, or specifications based on them. Furthermore, multiple systems can be combined (e.g., LTE or LTE-A, combinations with 5G, etc.) for application.

[0541] As used in this disclosure, the term "based on" does not mean "based on only" unless otherwise specified. In other words, the term "based on" means both "based on only" and "based on at least".

[0542] Any reference to an element using the designations "first," "second," etc., as used in this disclosure does not comprehensively limit the quantity or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to the first and second elements does not imply that only two elements may be used, or that the first element must take precedence over the second element in some form.

[0543] The term "determining" as used in this disclosure can encompass a wide variety of operations. For example, "determining" can also refer to judging, calculating, computing, processing, deriving, investigating, looking up (search, inquiry) (e.g., searching in a table, database or other data structure), and ascertaining.

[0544] In addition, "judgment (decision)" can also refer to receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, accessing (e.g., accessing data in memory), etc., as situations where "judgment (decision)" is performed.

[0545] Furthermore, "judgment (decision)" can also refer to situations where resolving, selecting, choosing, establishing, or comparing are considered as making a "judgment (decision)". That is, "judgment (decision)" can also refer to certain operations as making a "judgment (decision)". In this disclosure, "judgment (decision)" can also be rewritten in relation to the operations described above.

[0546] Furthermore, in this disclosure, "determine / determining" can also be interchanged with "assume / assuming," "expect / expecting," "consider / considering," etc. Additionally, in this disclosure, "not assuming..." can also be interchanged with "assuming not...".

[0547] In this disclosure, "expect" can also be interchanged with "be expected." For example, "expect(s)..." (where "..." can also be expressed using a that clause, an infinitive to, etc.) can be interchanged with "be expected...". "Does not expect..." can also be interchanged with "be not expected...". Furthermore, "An apparatus A is not expected..." can also be interchanged with "Apparatus B other than apparatus A does not expect..." (for example, if apparatus A is a UE, apparatus B can also be a base station).

[0548] The term "maximum transmit power" as used in this disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0549] As used in this disclosure, the terms “connected,” “coupled,” or all variations thereof, refer to all direct or indirect connections or combinations between two or more elements, and can include cases where there is one or more intermediate elements between two mutually “connected” or “coupled” elements. The connections or combinations between elements can be physical, logical, or a combination thereof. For example, “connection” can also be rewritten as “access.”

[0550] In this disclosure, when two elements are connected, it is possible to consider using more than one wire, cable, printed electrical connection, etc. to be "connected" or "combined" with each other, and as several non-limiting and non-exclusive examples, to use electromagnetic energy with wavelengths having wireless frequency domain, microwave region, light (both visible and invisible) region to be "connected" or "combined" with each other.

[0551] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other." Additionally, the term can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0552] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," mean inclusive. Furthermore, the term "or" as used in this disclosure does not mean XOR.

[0553] In this disclosure, for example, in cases where articles are added through translation, such as a, an, and the in English, the disclosure may also include cases where the noun following these articles is in a plural form.

[0554] In this disclosure, terms such as "below," "less than," "above," "more than," and "equal to" can be interchanged. Furthermore, in this disclosure, statements meaning "good," "bad," "large," "small," "high," "low," "early," "late," "wide," and "narrow" can be interchanged, not limited to the positive, comparative, and superlative degrees. Additionally, in this disclosure, statements meaning "good," "bad," "large," "small," "high," "low," "early," "late," "wide," and "narrow" can also be interchanged as expressions accompanied by "i" (where i is any integer), not limited to the positive, comparative, and superlative degrees (e.g., "highest" can also be interchanged with "i-th highest").

[0555] In this disclosure, "of", "for", "regarding", "related to", "associated with", etc., can also be rewritten interchangeably.

[0556] In this disclosure, phrases such as "when A, B", "if A, then B", "B upon A", "B in response to A", "B based on A", "B during / while A", "B before A", "B at (the same time as) / on A", "B after A", "B since A", and "B until A" can be rewritten interchangeably. Furthermore, A and B can be appropriately replaced with nouns, gerunds, or other suitable expressions depending on the context. Additionally, the time difference between A and B can be approximately 0 (immediately following or immediately preceding). Moreover, a time offset can be applied to the time A occurs. For example, "A" can also be rewritten interchangeably with "before / after the time offset of A". This time offset (e.g., more than one symbol / slot) can be predetermined or determined by the UE based on the information it is notified of.

[0557] In this disclosure, timing, moment, time, time instance, arbitrary time unit (e.g., time slot, sub-time slot, symbol, subframe), period, opportunity, resource, etc., can also be rewritten to each other.

[0558] The inventions disclosed herein have been described in detail above. However, it will be apparent to those skilled in the art that the inventions disclosed herein are not limited to the embodiments described herein. The description herein is for illustrative purposes only and is not intended to limit the inventions disclosed herein in any way.

Claims

1. A terminal, comprising: The control unit determines the CCE index based on a first derivation method related to the control channel element index (CCE index) corresponding to candidates of the physical downlink control channel (PDCCH) using multiple layers. The first derivation method differs from a second derivation method, which is related to the CCE index corresponding to candidates of the PDCCH using one layer. The receiving unit monitors the PDCCH using the multiple layers based on the CCE index.

2. The terminal according to claim 1, wherein, The first parameter based on the time slot number in the first export method is different from the second parameter based on the time slot number in the second export method.

3. The terminal according to claim 1, wherein, The first parameter based on the time slot number in the first derivation method is determined based on a specific initial value. The specific initial value is different from the value of the specific wireless network temporary identifier, i.e., RNTI.

4. The terminal according to claim 1, wherein, The first parameter in the first export method, based on the slot number, is the value of a specific Radio Network Temporary Identifier (RNTI). The control unit determines the update of the specific RNTI value based on specific indication information.

5. A wireless communication method for a terminal, comprising: Based on a first derivation method related to the control channel element index (CCE index) corresponding to candidates of the physical downlink control channel (PDCCH) using multiple layers, the CCE index is determined. The first derivation method differs from a second derivation method, where the second derivation method involves steps related to the CCE index corresponding to candidates of the PDCCH using one layer. Based on the CCE index, the step of monitoring the PDCCH using the multiple layers is performed.

6. A base station, comprising: The control unit indicates the CCE index using a first derivation method related to the control channel element index (CCE index) corresponding to candidates of the physical downlink control channel (PDCCH) using multiple layers. The first derivation method differs from a second derivation method, which is related to the CCE index corresponding to candidates of the PDCCH using one layer. The sending unit uses the CCE index to send PDCCHs using the multiple layers.

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