Transmission device, reception device, and communication method

Abstract

A transmission device according to the present disclosure comprises a control unit. The control unit transmits, to a reception device, a first control signal including first feedback information for a data signal and first transmission information relating to a physical downlink shared channel (PDSCH) for transmitting the data signal. The control unit transmits the data signal using the PDSCH together with another transmission device. The control unit receives, from the reception device, a feedback signal for the data signal. The other transmission device transmits, to the reception device, a second control signal including second feedback information for the data signal and second transmission information relating to the PDSCH for transmitting the data signal.

Description

Transmitting device, receiving device, and communication method

[0001] The present disclosure relates to a transmitting device, a receiving device, and a communication method.

[0002] Radio access methods and radio networks for cellular mobile communications (hereinafter also referred to as "Long Term Evolution (LTE)," "LTE-Advanced (LTE-A)," "LTE-Advanced Pro (LTE-A Pro)," "New Radio (NR)," "New Radio Access Technology (NRAT)," "Evolved Universal Terrestrial Radio Access (EUTRA)," or "Further EUTRA (FEUTRA)") are being considered by the 3rd Generation Partnership Project (3GPP (registered trademark)).

[0003] In the following description, LTE includes LTE-A, LTE-A Pro, and EUTRA, and NR includes NRAT and FEUTRA. In LTE, a base station (base station device) is referred to as an eNodeB (evolved NodeB), in NR, a base station (base station device) is referred to as a gNodeB, and in LTE and NR, a terminal device (mobile station, mobile station device, terminal) is referred to as a UE (User Equipment). LTE and NR are cellular communication systems in which multiple areas covered by a base station are arranged in the form of cells. A single base station may manage multiple cells.

[0004] 5G NR is a next-generation radio access technology (RAT) different from LTE, and is a next-generation radio access method for LTE. NR is an access technology that can support various use cases, including eMBB (Enhanced mobile broadband), mMTC (Massive machine type communications), and URLLC (Ultra reliable and low latency communications). NR has been standardized to support a technical framework that corresponds to the usage scenarios, requirements, and deployment scenarios of those use cases.

[0005] In addition, standardization activities are underway for 6G (Beyond 5G, B5G), the next-generation communications standard beyond 5G, and next-generation technologies, including enhancements to the NR standard, are being considered.

[0006] Cooperative communications are also known in which signals are transmitted from different transmission points, e.g., a communication system in which a first transmission with first data is made from a NodeB and a second transmission with second data is made from a relay node.

[0007] Japanese Patent Application Laid-Open No. 2015-233351

[0008] Cooperative communication includes Non-Coherent Joint Transmission (NCJT) communication in which the receiving side expects to receive two PDSCHs, and Coherent Joint Transmission (CJT) communication in which the receiving side expects to receive one PDSCH.

[0009] These cooperative communications improve throughput and communication reliability through redundancy.

[0010] Regarding the above-mentioned NCJT communication, various studies have been conducted to enable NCJT communication. On the other hand, it cannot be said that sufficient studies have been conducted on CJT communication, and it has not been said that CJT communication can be implemented.

[0011] Therefore, it is desirable to further improve communication performance such as throughput and communication reliability by realizing CJT communication (cooperative communication).

[0012] Therefore, the present disclosure proposes a transmitting device, a receiving device, and a communication method that can further improve communication performance through cooperative communication.

[0013] It should be noted that the above problem or object is merely one of multiple problems or objects that can be solved or achieved by multiple embodiments disclosed in this specification.

[0014] A transmitting device of the present disclosure includes a control unit. The control unit transmits, to a receiving device, a first control signal including first feedback information for a data signal and first transmission information related to a Physical Downlink Shared Channel (PDSCH) that transmits the data signal. The control unit transmits the data signal using the PDSCH together with another transmitting device. The control unit receives a feedback signal for the data signal from the receiving device. The other transmitting device transmits, to the receiving device, a second control signal including the second feedback information for the data signal and second transmission information related to the PDSCH that transmits the data signal.

[0015] 1 is a diagram illustrating an example of a HARQ process. FIG. 2 is a diagram illustrating an example of a redundancy version. FIG. 3 is a diagram illustrating an example of cooperative communication based on S-DCI. FIG. 4 is a diagram illustrating an example of cooperative communication based on M-DCI. FIG. 5 is a diagram illustrating an example of general transmission. FIG. 6 is a diagram illustrating an example of transmission by NCJT communication using S-DCI. FIG. 7 is a diagram illustrating an example of transmission by NCJT communication using M-DCI. FIG. 8 is a diagram illustrating an example of transmission by CJT communication using S-DCI. FIG. 9 is a diagram illustrating an example of transmission by CJT communication using M-DCI according to the proposed technology of the present disclosure. FIG. 10 is a diagram illustrating an example of a network configuration that a communication system according to an embodiment of the present disclosure can adopt. FIG. 11 is a diagram illustrating an example of a base station configuration according to an embodiment of the present disclosure. FIG. 12 is a diagram illustrating an example of a terminal device configuration according to the present disclosure. FIG. 13 is a sequence diagram illustrating an example of communication processing according to an embodiment of the present disclosure. FIG. 14 is a diagram illustrating an example of a first control pattern according to an embodiment of the present disclosure. FIG. 15 is a diagram illustrating an example of a second control pattern according to an embodiment of the present disclosure. FIG. 16 is a diagram illustrating an example of a third control pattern according to an embodiment of the present disclosure. FIG. 17 is a diagram illustrating an example of a fourth control pattern according to an embodiment of the present disclosure. FIG. 18 is a diagram illustrating an example of a first feedback pattern according to an embodiment of the present disclosure. FIG. 19 is a diagram illustrating an example of a second feedback pattern according to an embodiment of the present disclosure. FIG. 19 is a diagram illustrating an example of a third feedback pattern according to an embodiment of the present disclosure. Fig. 10 is a diagram illustrating an example of a fourth feedback pattern according to an embodiment of the present disclosure. Fig. 11 is a sequence diagram illustrating an example of a communication process according to an application example of an embodiment of the present disclosure. Fig. 12 is a sequence diagram illustrating an example of a communication process according to an application example of an embodiment of the present disclosure.

[0016] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant description will be omitted.

[0017] In this specification and drawings, similar components of the embodiments may be distinguished by adding at least one different alphabet and / or number after the same reference numeral. However, if there is no need to particularly distinguish between the similar components, only the same reference numeral will be used.

[0018] One or more embodiments (including examples, modifications, and application examples) described below can be implemented independently. However, at least a portion of the embodiments described below may be implemented in appropriate combination with at least a portion of another embodiment. These embodiments may include novel features that are different from each other. Therefore, these embodiments may contribute to solving different purposes or problems and may produce different effects from each other.

[0019] <<1. Introduction>> <1-1. Related Art> <1-1-1. Information Regarding HARQ> For example, in a communication system requiring high reliability, Hybrid Automatic Repeat reQuest (HARQ) may be implemented in the physical layer in order to improve the reliability of the physical layer. In this HARQ, a receiving device is expected to determine whether transmitted information has been correctly received and notify the transmitting device of the result (ACK or NACK).

[0020] As an example, the process and response of HARQ in 3GPP when transmitting data from a base station to a terminal device will be described.

[0021] Fig. 1 shows an example of a HARQ process, in which a base station divides a transport block (TB) into coding units called code blocks (CBs) to perform forward error correction coding of the TB, to which a cyclic redundancy check (CRC) code is assigned.

[0022] Next, the base station assigns a CRC code to each CB, and then performs error correction coding on a CB-by-CB basis to generate a codeword (CW).

[0023] Next, the base station extracts a bit sequence from a certain place in the CW and processes it for transmission. This certain place is managed under the name of redundancy version (VR).

[0024] Here, Figure 2 is a diagram showing an example of a redundancy version. As shown in Figure 2, RV is usually designated by a value from 0 to 3 (RV0 to RV3). For example, when RV1 is designated, a bit sequence from the position designated by RV1 is extracted from a CW in which a CRC code (corresponding to Parity bits for CBn in the figure) is added to the nth CB (CBn), and processing for transmission is performed.

[0025] All RVs are sent in one information transmission opportunity, even within one bit stream recombined with CWs generated from other CBs.

[0026] The extracted CW is recombined with a CW generated from another CB to form a single bit sequence. This sequence is then modulated by the physical layer. Typically, HARQ transmits and receives ACK and NACK, each represented by one bit, in TB units. That is, the terminal device decodes the error correction code for the received information sequence in CB units. The terminal device then performs error detection using the CRC code added to the CB.

[0027] If no errors are found in any of the CBs that make up one TB, the terminal device sends an ACK to the base station, otherwise it sends a NACK.

[0028] Upon receiving a NACK from the terminal device, the base station retransmits a CW having a different RV from the previous one for all CBs.

[0029] The terminal device that receives the retransmission adds the likelihood of the initially transmitted information sequence to the likelihood of the retransmitted sequence and performs the error correction code decoding process again. This time, the decoding result is correct because the likelihood of the information is more reliable compared to the initially transmitted sequence.

[0030] In order to reduce the number of bits in a sequence to be retransmitted, a standard has been established in which HARQ feedback is performed in units of code block groups (CBGs) shown in the figure.

[0031] In this case, in a single feedback transmission opportunity, the terminal device transmits ACK and NACK notifications for all CBGs to the base station. The base station that receives the feedback performs retransmission processing only for the CBG for which NACK has been notified, thereby reducing the number of bits required for retransmission.

[0032] When transmission based on CBG is performed, the terminal device receives PDSCH-CodeBlockGroupTransmission, which is an upper layer parameter, from the base station to configure transmission based on CBG.

[0033] <1-1-2. Information about Multi-Transmit / Receive Point (MTRP)> (Outline of MTRP) MTRP is one of the base station coordination technologies belonging to Coordinated Multi-Point (CoMP). In MTRP, multiple Transmit / Receive Points (TRPs) are used. In MTRP, Non Coherent Joint Transmission (NCJT) communication and Coherent Joint Transmission (CJT) communication can be performed using multiple TRPs.

[0034] The realization of NCJT communication and CJT communication makes it possible to improve communication performance, such as improving throughput and improving communication reliability through redundancy.

[0035] Here, TRP refers to a part of a base station (e.g., a gNB) that has the function of receiving signals emitted from a terminal device (UE: User Equipment) or transmitting signals to a terminal device according to element-specific physical layer properties and parameters.

[0036] TRP may be interpreted as any of the following: - macro-cells - small cells - pico-cells - femto-cells - remote radio heads (RRH) - IAB (Integrated Access and Backhaul) node (relay nodes) - node - Distributed Unit (DU) - Radio Unit (RU) - base station (e.g., gNB, eNB)

[0037] In the following, a base station or a transmission device will be taken as an example of TRP for explanation. However, the base station or the transmission device may be interpreted as any of the above-mentioned TRPs.

[0038] (S-DCI and M-DCI) Coordinated communication by MTRP is roughly classified into two types: communication based on S-DCI (Single-Downlink Control Information) or communication based on M-DCI (Multi-DCI).

[0039] Figure 3 is a diagram showing an example of coordinated communication based on S-DCI. In Figure 3, for example, PDSCH (Physical Downlink Shared Channel) is transmitted individually from the first TRP and the second TRP. For example, the first TRP transmits the first PDSCH. The second TRP transmits the second PDSCH.

[0040] In S-DCI, control information for transmitting the first and second PDSCHs is transmitted from a single TPR (the first TRP in the example of Figure 3) to a receiving device (a smartphone in the example of Figure 3). For example, the first TRP transmits this control information to the receiving device using one PDCCCH (Physical Downlink Control Channel) (or one DCI).

[0041] FIG. 4 is a diagram showing an example of cooperative communication based on M-DCI. In FIG. 4, for example, a PDSCH (is transmitted individually from a first TRP and a second TRP. For example, the first TRP transmits the first PDSCH, and the second TRP transmits the second PDSCH.

[0042] In M-DCI, control information for transmitting the first and second PDSCHs is transmitted from each TPR to the receiving device (a smartphone in the example of FIG. 4). For example, the first TRP transmits this control information to the receiving device using the first PDCCH (or DCI). The second TRP transmits this control information to the receiving device using the second PDCCH (or DCI).

[0043] The transmission of control information is performed by the MAC and PHY layers of the TRP within the scope of the configuration provided by the RRC layer.

[0044] When M-DCI-based TRP is implemented, it is assumed that the receiving device (UE) is configured with two PDCCH-configs, which are higher layer parameters. The PDCCH-configs include the higher layer parameter ControlResourceSet with the higher layer parameter CoreSetPoolIndex. Each of the two PDCCH-configs includes a ControlResourceSet with a different CoreSetPoolIndex.

[0045] In this case, the receiving device expects to receive multiple PDCCHs scheduling two or more PDSCHs, which may be fully, partially, or non-overlapping in time or frequency.

[0046] For example, when a receiving device receives multiple PDSCHs that are completely or partially overlapped on the time axis, the PDSCHs have different CoresetPoolIndexes and are scheduled by PDCCHs associated with different ControlResourceSets.

[0047] If the receiving device is configured with a PDCCH-config that includes a ControlResourceSet with two separate CoreSetPoolIndexes, the following two cases are allowed:

[0048] (Case #1) Assume that a receiver is scheduled to receive a first PDSCH, and further assume that the starting symbol of that PDSCH receives two HARQ process IDs in a scheduled cell via PDCCHs associated with core set pool indices ending with i.

[0049] In this case, the receiver is scheduled to receive a PDSCH before the end of the first PDSCH by a PDCCH associated with a different core set pool index value that ends later than symbol i.

[0050] (Case #2) In a scheduled cell, the UE is assigned to receive the first PDSCH in slot i and the corresponding UCI is transmitted in slot j.

[0051] Also, a second PDSCH associated with a different core set pool index value than the first PDSCH is started later than the first PDSCH such that its corresponding UCI is transmitted in a slot earlier than slot j.

[0052] <1-1-3. MTRP-CJT> First, before discussing MTRP-CJT, general transmission will be explained using Fig. 5. Fig. 5 is a diagram showing an example of general transmission. Fig. 5 shows an example in which data is transmitted from a transmitting device to a receiving device.

[0053] The transmitting device transmits dynamic control information to the receiving device. This dynamic control information (DCI or PDCCH) includes K0 and K1. K0 indicates the number of time slots between the transmission of the dynamic control information and the transmission of the PDSCH. K1 indicates the number of time slots between the transmission of the PDSCH and the transmission of the ACK / NACK.

[0054] The transmitting device transmits the dynamic control information and then transmits the PDSCH. The receiving device receives the PDSCH K0 after receiving the dynamic control information. The receiving device transmits an ACK / NACK K1 after receiving the PDSCH.

[0055] Here, for example, data transmission in the case of NCJT communication will be described. Fig. 6 is a diagram showing an example of transmission by NCJT communication using S-DCI. In Fig. 6, different PDSCHs are transmitted from a first transmitting device and a second transmitting device to a receiving device.

[0056] The second transmitting device transmits dynamic control information (DCI or PDCCH) to the receiving device, which includes information for receiving the first PDSCH and the second PDSCH (e.g., the number of time slots between the first PDSCH and the second PDSCH) and information for transmitting the corresponding ACK / NACK.

[0057] The second transmitting device transmits the second PDSCH after transmitting the dynamic control information. For example, the second transmitting device transmits the second PDSCH, and then the first transmitting device transmits the first PDSCH. The receiving device receives the second PDSCH and then the first PDSCH according to the dynamic control information.

[0058] The receiving device transmits ACK / NACK for the first PDSCH and the second PDSCH to the second transmitting device. In this way, in NCJT communication using S-DCI, the standard specifies that the receiving device transmits ACK / NACK to the transmitting device that transmitted the dynamic control information (the second transmitting device in FIG. 6 ).

[0059] 7 is a diagram showing an example of transmission by NCJT communication using M-DCI. In FIG. 7, different PDSCHs are transmitted from a first transmitting device and a second transmitting device to a receiving device.

[0060] The second transmitting device transmits second dynamic control information (DCI or PDCCH) to the receiving device, the second dynamic control information including information for receiving the second PDSCH and information for transmitting the corresponding ACK / NACK.

[0061] The first transmitting device transmits first dynamic control information (DCI or PDCCH) to the receiving device, the first dynamic control information including information for receiving the first PDSCH and information for transmitting the corresponding ACK / NACK.

[0062] For example, the second transmitting device transmits the second PDSCH after the first transmitting device transmits the first dynamic control information. After the second transmitting device transmits the second PDSCH, for example, the first transmitting device transmits the first PDSCH. The receiving device receives the second PDSCH in accordance with the second dynamic control information, and then receives the first PDSCH in accordance with the first dynamic control information.

[0063] The receiving device transmits a first ACK / NACK for the first PDSCH to the first transmitting device, and then transmits a second ACK / NACK for the second PDSCH to the second transmitting device.

[0064] As described above, in NCJT communication using M-DCI, the standard specifies that the receiving device transmits an ACK / NACK to the transmitting device that transmitted the dynamic control information. At this time, the ACK / NACK includes only information about the PDSCH transmitted by the transmitting device. That is, the first ACK / NACK includes information about the first PDSCH, but does not include information about the second PDSCH. Similarly, the second ACK / NACK includes information about the second PDSCH, but does not include information about the first PDSCH.

[0065] Furthermore, the arrival order of the dynamic control information does not necessarily correspond to the arrival order of the PDSCH or the transmission order of the ACK / NACK. That is, even if the first dynamic control information arrives after the second control information, the first PDSCH does not necessarily arrive after the second PDSCH. Furthermore, even if the first dynamic control information arrives after the second control information, the receiving device does not necessarily transmit the first ACK / NACK after the second ACK / NACK.

[0066] In this way, the operation of NCJT communication is determined by standards. Standardization of CJT communication is also underway.

[0067] For example, Rel-18 is standardizing PDSCH-CJT for S-DCI-based systems (Reference: RAN1 Agreements 9.1.1.1 (post-RAN1#114), [Retrieved June 10, 2022], Internet URL: https: / / www.3gpp.org / ftp / tsg_ran / WG1_RL1 / TSGR1_114 / Inbox / drafts / 9.1(NR_MIMO_evo_DL_UL) / Agreements%20(post-RAN1%23114) / RAN1%20Agreements%209.1.1.1%20-%20post-RAN1-114.docx).

[0068] The difference between CJT and NCJT in 3GPP can be understood as whether the receiving terminal expects to receive one PDSCH (CJT) or two PDSCHs (NCJT) when data signals (PDSCHs) from two or more TRPs are transmitted by an MTRP.

[0069] 8 is a diagram showing an example of transmission by CJT communication using S-DCI, in which a first transmitting device and a second transmitting device transmit data to a receiving device using one PDSCH (PDSCH-CJT).

[0070] The second transmitting device transmits dynamic control information (DCI or PDCCH) to the receiving device, which includes information for receiving the PDSCH-CJT and information for transmitting the corresponding ACK / NACK.

[0071] The second transmitting device transmits a PDSCH-CJT after transmitting the dynamic control information. Also, the first transmitting device transmits a PDSCH-CJT after the second transmitting device transmits the dynamic control information. The receiving device receives the PDSCH-CJT (one PDSCH) in accordance with the dynamic control information. The receiving device transmits an ACK / NACK for the PDSCH-CJT to the second transmitting device.

[0072] In this way, in NCJT communication using S-DCI, the standard stipulates that the receiving device transmits ACK / NACK to the transmitting device (the second transmitting device in Figure 6) that transmitted the dynamic control information.

[0073] In the above-mentioned Rel-18, the Unified TCI (Transmission Configuration Indication) framework is extended for PDSCH-CJT. Up to two Joint TCI states can be indicated in the MAC CE or DCI. In addition, in the Joint DL / UL TCI mode, this Joint TCI state can be used for CJT-based reception of a single configured BWP / CC. In this case, the number of Joint TCI states supported for PDSCH-CJT depends on the capability of the UE (receiving device).

[0074] S-DCI PDSCH-CJT is configured by RRC signaling, and dynamic change from PDSCH-CJT to other S-DCI MTRP transmission methods is not supported, meaning that switching must be performed at the RRC signaling level.

[0075] If the UE supports specifying two Joint / DL States for PDSCH-CJT, the UE supports one of the following two states for each Joint TCI State: - One or more PDSCH DMRS Ports can configure the QCL state as the DL RSs and QCL-A of each TCI State. - One or more PDSCH DMRS Ports can configure the QCL (Quasi co-location) state as the DL RSs and QCL-A of each TCI State, excluding the parameters {Doppler shift, Doppler spread}.

[0076] Which of these two methods is selected depends on the UE's capability and is configured by an RRC signal.

[0077] <1-1-4. Issues> As mentioned above, methods for implementing PDSCH-CJT in S-DCI-based MTRP are being studied. On the other hand, M-DCI-based MTRP (CJT communication using M-DCI) has not been sufficiently discussed.

[0078] At present, it is considered possible to realize MTRP between inter-TRPs by using M-DCI. Also, it is expected that M-DCI will be used for MTRPs using TRPs where the connection between MTRPs is not ideal. For these reasons, when considering the realization of MTRPs using multiple TRPs, it is desirable to realize PDSCH-CJT based on M-DCI as well as S-DCI.

[0079] By implementing MTRP using M-DCI, further improvements in communication performance, such as throughput and communication reliability, can be expected even in TRPs where inter-TRP or MTRP connections are not ideal.

[0080] Here, in MTRP using M-DCI, one of the things that should be considered to realize PDSCH-CJT is, for example, a method of notifying HARQ-ACK / NACK for PDSCH scheduled by multiple PDCCHs.

[0081] A mechanism is required to realize MTRP using M-DCI, such as how multiple TRPs schedule PDSCHs on multiple PDCCHs and how a receiving device transmits ACK / NACK for received PDSCHs.

[0082] <1-1-5. Overview of Proposed Technology> Fig. 9 is a diagram showing an example of transmission by CJT communication using M-DCI according to the proposed technology of the present disclosure. The CJT communication shown in Fig. 9 is performed, for example, in a communication system including a first transmitting device, a second transmitting device, and a receiving device. In Fig. 9, the receiving device receives PDSCH-CJT (one PDSCH) transmitted from the first transmitting device and the second transmitting device.

[0083] A second transmitting device (an example of another transmitting device) transmits second dynamic control information (an example of a second control signal) to the receiving device. The second dynamic control information includes second transmission information related to a PDSCH that transmits a data signal, and second feedback information for the data signal. The second transmission information is, for example, information for receiving a PDSCH-CJT. The second feedback information is, for example, information for transmitting an ACK / NACK corresponding to the PDSCH-CJT.

[0084] A first transmitting device (an example of a transmitting device) transmits first dynamic control information (an example of a first control signal) to a receiving device. The first dynamic control information includes first transmission information related to a PDSCH that transmits a data signal, and first feedback information for the data signal. The first transmission information is, for example, information for receiving a PDSCH-CJT. The first feedback information is, for example, information for transmitting an ACK / NACK corresponding to the PDSCH-CJT.

[0085] The first transmitting device and the second transmitting device transmit PDSCH-CJT, for example, after transmitting dynamic control information. The PDSCH-CJT transmitted by the first transmitting device and the second transmitting device includes, for example, signals synchronized in time or phase with each other. The receiving device receives, for example, the PDSCH-CJT as one PDSCH.

[0086] After receiving the PDSCH-CJT, the receiving device transmits ACK / NACK (an example of a feedback signal) for the data included in the PDSCH-CJT based on the first and second dynamic control information.

[0087] This enables the communication system to realize MTRP using M-DCI, thereby further improving communication performance such as throughput and communication reliability.

[0088] <<2. Configuration Example of a Communication System>> <2-1. Overall Configuration Example of a Communication System> Fig. 10 is a diagram showing an example of a network configuration that can be adopted by a communication system according to an embodiment of the present disclosure. The lines (dashed lines) in the figure represent logical connections and are not necessarily directly connected physically. A communication area is made up of "cells" (ellipses in the figure) each of which is serviced by a plurality of base stations. A single base station may provide multiple cells.

[0089] Base stations can communicate with each other via backhaul (whether wired or wireless), mainly exchanging control information. This backhaul communication is expected to use the X2 interface or S1 interface protocol.

[0090] The base station also has a backhaul to the core network of the system, which may be connected to a control entity (which may be considered as one of the elements of the core network).

[0091] In addition, the base station may be connected to the core network via an external network other than via a control entity. Examples of base stations that connect in this way include femtocell base stations that can be installed indoors or in homes, or HeNB devices.

[0092] Similarly, when base station functions are split and base stations are defined as separate units, these units may have a mid-haul between them. These units may be connected to a control entity or the core network by being individually connected to the control entity or the core network. Furthermore, these units may be connected to the control entity or the core network in a relay manner between the same or different units resulting from the split of functions.

[0093] Where a division of base station functions is implemented and base stations are defined as separate units, these units may be shared by devices or entities that constitute the same or separate base stations, macrocells or microcells.

[0094] When a division of base station functions is implemented and base stations are defined as separate units, these units do not necessarily have to be physically separated, but may be defined by a virtual or logical separation.

[0095] The midhaul may be established physically or logically. In this case, the midhaul may be configured as a dedicated communication path or may be configured as a general public network. Alternatively, the midhaul may be established via a wireless device. The midhaul and backhaul may overlap.

[0096] Furthermore, the devices or base stations constituting the macrocell or microcell may have a fronthaul between a unit including at least an RF device or an antenna device and other functions or devices, in which case the fronthaul allows any connection, whether physical, logical, wireless, wired, leased line, or general network.

[0097] The devices constituting the small cell or femtocell may be configured by units including at least an RF device or an antenna device, and these units may be shared by one or more base stations or any devices with similar functionality.

[0098] Small cell areas are generally arranged so as to overlap with macro cell areas, but small cell areas may be arranged partially or completely outside the macro cell area.

[0099] A device constituting a macro cell, a device constituting a small cell, or a device having base station functionality may have characteristics in the radio resources it uses. For example, the same frequency resource F1 (or time resource T1) may be used in the macro cell and the small cell. In this way, the communication system can improve the radio resource utilization efficiency of the entire system.

[0100] On the other hand, the macro cell may use frequency resource F1 (or time resource T1), and the small cell may use frequency resource F2 (or time resource T2). In this way, the communication system can avoid interference between the macro cell and the small cell. Furthermore, both types of cells or devices having base station functions may each use F1 / 2 (T1 / 2). When applied to frequency resources, this is a concept equivalent to Carrier Aggregation (CA).

[0101] Assuming that macrocells and small cells or devices with base station functionality are spatially separated, they may be characterized by the radio resources they use and the method of superimposing them, such as MIMO (Multi-Input Multiple-Output) and spatial division multiplexing using beamforming.

[0102] A macrocell and a small cell may include multiple transmission / reception points or multiple radio wave transmitters and receivers. In communications using multiple transmission / reception points or multiple radio wave transmitters and receivers, the multiple transmission / reception points and multiple radio wave transmitters and receivers may use different resources (frequencies, time) for transmission and reception, or may use the same resources. The multiple transmission / reception points and multiple radio wave transmitters and receivers may be shared and used by different cells.

[0103] <2-2. Configuration Example of Base Station> Next, the base station 20 will be described. The base station 20 is a communication device that operates a cell and provides wireless communication services to one or more terminal devices 40 located within the coverage of the cell. The cell is operated according to any wireless communication method, such as LTE or NR. The base station 20 is connected to a core network 200. The core network 200 is connected to a packet data network (not shown) via a gateway device (not shown). Furthermore, the base station 20 operates beams that can be identified by SSB (Synchronization Signal / PBCH Block), and can transmit and receive data to and from one or more terminal devices 40 via one or more beams.

[0104] The base station 20 may be configured as a collection of multiple physical or logical devices. For example, in this embodiment, the base station 20 may be divided into multiple devices, a baseband unit (BBU) and an RU, and may be interpreted as a collection of these multiple devices. Additionally or alternatively, in this embodiment, the base station 20 may be either or both of a BBU and an RU. The BBU and the RU may be connected via a predetermined interface (e.g., eCPRI). Additionally or alternatively, the RU may be referred to as a remote radio unit (RRU) or a radio DoT (RD). Additionally or alternatively, the RU may be compatible with a gNB-DU (gNB-CU) (described later). Additionally or alternatively, the BBU may be compatible with a gNB-CU (gNB-CU) (described later). Alternatively, the RU may be connected to a gNB-DU (gNB-DU) (described later). Furthermore, the BBU may be compatible with a combination of a gNB-CU and a gNB-DU (gNB-DU) (described later). Additionally or alternatively, the RU may be a device integrally formed with an antenna. The antennas of the base station 20 (e.g., antennas integrally formed with the RUs) may employ an Advanced Antenna System and support MIMO (e.g., FD-MIMO) and beamforming. In the Advanced Antenna System, the antennas of the base station 20 (e.g., antennas integrally formed with the RUs) may include, for example, 64 transmitting antenna ports and 64 receiving antenna ports.

[0105] Furthermore, multiple base stations 20 may be connected to each other. One or more base stations 20 may be included in a Radio Access Network (RAN). That is, the base station 20 may simply be referred to as a RAN, a RAN node, an Access Network (AN), or an AN node. The RAN in LTE is called an Enhanced Universal Terrestrial RAN (EUTRAN). The RAN in NR is called an NGRAN. The RAN in W-CDMA (UMTS) is called a UTRAN. The base station 20 in LTE is called an eNodeB (Evolved Node B) or eNB. That is, the EUTRAN includes one or more eNodeBs (eNBs). Furthermore, the base station 20 in NR is called a gNodeB or gNB. That is, the NGRAN includes one or more gNBs. Furthermore, the EUTRAN may include a gNB (en-gNB) connected to a core network (EPC) in an LTE communication system (EPS). Similarly, the NGRAN may include an ng-eNB connected to a core network (5GC) in a 5G communication system (5GS). Additionally or alternatively, if the base station 20 is an eNB, gNB, or the like, it may be referred to as a 3GPP access. Additionally or alternatively, if the base station 20 is a wireless access point (e.g., a Wi-Fi (registered trademark) access point), it may be referred to as a non-3GPP access. Additionally or alternatively, the base station 20 may be an optical extension device called an RRH (Remote Radio Head). Additionally or alternatively, if the base station 20 is a gNB, it may be referred to as a combination of the aforementioned gNB CU (Central Unit) and gNB DU (Distributed Unit), or as either one of them. The gNB CU hosts multiple upper layers (e.g., RRC, SDAP, PDCP) in the Access Stratum for communication with the UE, while the gNB-DU hosts multiple lower layers (e.g., RLC, MAC, PHY) in the Access Stratum.That is, among the messages and information described below, RRC signaling (e.g., various SIBs including MIB and SIB1, RRC Setup message, RRC Reconfiguration message) may be generated by the gNB CU, while the DCI and various physical channels (e.g., PDCCH and PBCH) described below may be generated by the gNB-DU. Alternatively, among the RRC signaling, some configuration (setting information), such as IE:cellGroupConfig, may be generated by the gNB-DU, and the remaining configuration may be generated by the gNB-CU. These configurations (setting information) may be transmitted and received via the F1 interface described below. A base station 20 may be configured to be able to communicate with other base stations 20. For example, when multiple base stations 20 are eNBs or a combination of an eNB and an en-gNB, the base stations 20 may be connected to each other via an X2 interface. Additionally or alternatively, when multiple base stations 20 are gNBs or a combination of a gn-eNB and a gNB, the devices may be connected to each other via an Xn interface. Additionally or alternatively, when multiple base stations 20 are a combination of gNB CU and gNB DU, the devices may be connected via the F1 interface described above. Messages and information (RRC signaling or DCI information, physical channel) described below may be communicated between multiple base stations 20 (e.g., via X2, Xn, or F1 interfaces).

[0106] Furthermore, as described above, the base station 20 may be configured to manage multiple cells. A cell provided by the base station 20 is called a serving cell. The serving cell includes a PCell (Primary Cell) and an SCell (Secondary Cell). When dual connectivity (e.g., EUTRA-EUTRA Dual Connectivity, EUTRA-NR Dual Connectivity (ENDC), EUTRA-NR Dual Connectivity with 5GC, NR-EUTRA Dual Connectivity (NEDC), NR-NR Dual Connectivity) is provided to a UE (e.g., a terminal device 40), the PCell and zero or one or more SCell(s) provided by a Master Node (MN) are called a Master Cell Group. Furthermore, the serving cell may include a PSCell (Primary Secondary Cell or Primary SCG Cell). That is, when dual connectivity is provided to a UE, the PSCell and zero or one or more SCell(s) provided by a Secondary Node (SN) are called a Secondary Cell Group (SCG). Unless special configuration (e.g., PUCCH on SCell) is performed, the physical uplink control channel (PUCCH) is transmitted on the PCell and PSCell, but not on the SCell. Furthermore, radio link failure is detected on the PCell and PSCell, but not on the SCell (it does not need to be detected). Since the PCell and PSCell thus play special roles among the serving cell(s), they are also called special cells (SpCells). One cell may be associated with one downlink component carrier and one uplink component carrier. Furthermore, the system bandwidth corresponding to one cell may be divided into multiple bandwidth parts.In this case, one or more Bandwidth Parts (BWP) may be configured in the UE, and one Bandwidth Part may be used by the UE as an Active BWP. Furthermore, radio resources (e.g., frequency band, numerology (subcarrier spacing), slot format (Slot configuration)) that the terminal device 40 can use may differ for each cell, each component carrier, or each BWP.

[0107] 11 is a diagram illustrating a configuration example of a base station 20 according to an embodiment of the present disclosure. The figure is a block diagram illustrating a configuration example of the base station 20. The base station 20 is a communication device (wireless system) that wirelessly communicates with a terminal device 40. The base station 20 is a type of information processing device.

[0108] The base station 20 includes a signal processing unit 21, a storage unit 22, a network communication unit 23, and a control unit 24. Note that the configuration shown in the figure is a functional configuration, and the hardware configuration may be different from this. Furthermore, the functions of the base station 20 may be distributed and implemented in multiple physically separated devices.

[0109] The signal processing unit 21 is a wireless communication interface that performs wireless communication with other communication devices (for example, a terminal device 40 and another base station 20). The signal processing unit 21 operates under the control of the control unit 24. The signal processing unit 21 may be compatible with multiple wireless access methods. For example, the signal processing unit 21 may be compatible with both NR and LTE. The signal processing unit 21 may be compatible with other cellular communication methods such as W-CDMA and cdma2000. Furthermore, the signal processing unit 21 may be compatible with a wireless LAN communication method in addition to the cellular communication method. Of course, the signal processing unit 21 may only be compatible with one wireless access method.

[0110] The signal processing unit 21 includes a reception processing unit 211, a transmission processing unit 212, and an antenna 213. The signal processing unit 21 may include a plurality of reception processing units 211, a plurality of transmission processing units 212, and a plurality of antennas 213. When the signal processing unit 21 supports a plurality of radio access methods, each unit of the signal processing unit 21 may be configured individually for each radio access method. For example, when the base station 20 supports NR and LTE, the reception processing unit 211 and the transmission processing unit 212 may be configured individually for NR and LTE.

[0111] The reception processing unit 211 processes an uplink signal received via the antenna 213. The reception processing unit 211 includes a radio reception unit 211a, a demultiplexing unit 211b, a demodulation unit 211c, and a decoding unit 211d.

[0112] The radio receiving unit 211a performs down-conversion, removal of unnecessary frequency components, control of amplification level, quadrature demodulation, conversion to a digital signal, removal of guard intervals, extraction of frequency domain signals by fast Fourier transform, etc. on the uplink signal. For example, assume that the radio access method of the base station 20 is a cellular communication method such as LTE. In this case, the demultiplexing unit 211b separates uplink channels such as PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel) and uplink reference signals from the signal output from the radio receiving unit 211a. The demodulating unit 211c demodulates the received signal using a modulation method such as BPSK (Binary Phase Shift Keying) or QPSK (Quadrature Phase Shift Keying) for the modulation symbols of the uplink channel. The modulation scheme used by the demodulator 211c may be multi-level QAM such as 16QAM (Quadrature Amplitude Modulation), 64QAM, or 256QAM. The decoder 211d performs decoding processing on the coded bits of the demodulated uplink channel. The decoded uplink data and uplink control information are output to the controller 24.

[0113] The transmission processing unit 212 performs the transmission processing of downlink control information and downlink data. The transmission processing unit 212 includes an encoding unit 212a, a modulation unit 212b, a multiplexing unit 212c, and a wireless transmission unit 212d.

[0114] The encoding unit 212a encodes the downlink control information and downlink data input from the control unit 24 using an encoding method such as block encoding, convolutional encoding, or turbo encoding. The modulation unit 212b modulates the encoded bits output from the encoding unit 212a using a predetermined modulation method such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM. The multiplexing unit 212c multiplexes the modulation symbols of each channel and the downlink reference signal and arranges them in a predetermined resource element. The wireless transmission unit 212d performs various signal processes on the signal from the multiplexing unit 212c. For example, the wireless transmission unit 212d performs processes such as conversion to the time domain by fast Fourier transform, addition of a guard interval, generation of a baseband digital signal, conversion to an analog signal, quadrature modulation, up-conversion, removal of extra frequency components, and amplification of power. The signal generated by the transmission processing unit 212 is transmitted from the antenna 213.

[0115] The storage unit 22 is a storage device capable of reading and writing data, such as a DRAM, SRAM, flash memory, or hard disk. The storage unit 22 functions as the storage means of the base station 20.

[0116] The network communication unit 23 is a communication interface for communicating with other devices (for example, other base stations 20). For example, the network communication unit 23 is a LAN (Local Area Network) interface such as a NIC (Network Interface Card). The network communication unit 23 may be a USB (Universal Serial Bus) interface composed of a USB host controller, a USB port, etc. Also, the network communication unit 23 may be a wired interface or a wireless interface. The network communication unit 23 functions as the network communication means of the base station 20. The network communication unit 23 communicates with other devices according to the control of the control unit 24.

[0117] The control unit 24 is a controller that controls each unit of the base station 20. The control unit 24 is realized by a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). For example, the control unit 24 is realized by a processor executing various programs stored in a storage device inside the base station 20 using a RAM (Random Access Memory) or the like as a working area. The control unit 24 may also be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The CPU, MPU, ASIC, and FPGA can all be considered as controllers.

[0118] The base station 20 performs MTRP transmission in cases including at least the following configurations, for example: - A case in which multiple DUs are connected to a single CU, for example, via an F1 interface - A case in which multiple RRHs are connected to a single DU via a wired or wireless connection - A case in which multiple IAB donors are connected to a single IAB donor via a wired or wireless connection

[0119] Furthermore, the base station 20 may have a function of performing data communication with, for example, the terminal device 40. The base station 20 may have a function of implementing HARQ when performing data communication with the terminal device 40.

[0120] Furthermore, the base station 20 may have a function of transmitting control information to the terminal device 40 in order to perform data communication with the terminal device 40. For example, this control information may include an MIB, an SIB1, etc. The transmission of this control information may be divided into multiple transmissions.

[0121] The base station 20 may also have the function of receiving and decoding feedback from the terminal device 40 .

[0122] 2-3. Example of the Configuration of the Terminal Device The terminal device 40 is a wireless communication device that wirelessly communicates with the base station 20. The terminal device 40 is, for example, a mobile phone, a smart device (smartphone or tablet), a PDA (Personal Digital Assistant), or a personal computer. The terminal device 40 may also be a device such as a commercial camera equipped with a communication function, an M2M (Machine to Machine) device, or an IoT (Internet of Things) device.

[0123] The terminal device 40 may also be capable of sidelink communication with other terminal devices 40. The terminal device 40 may use an automatic retransmission technique such as Hybrid Automatic Repeat reQuest (HARQ) when performing sidelink communication. The terminal device 40 may also be capable of NOMA (Non Orthogonal Multiple Access) communication with the base station 20. The terminal device 40 may also be capable of NOMA communication in communication (sidelink) with other terminal devices 40. The terminal device 40 may also be capable of LPWA (Low Power Wide Area) communication with other communication devices (e.g., base stations 20 and other terminal devices 40). Alternatively, the wireless communication used by the terminal device 40 may be wireless communication using millimeter waves. The wireless communication (including sidelink communication) used by the terminal device 40 may be wireless communication using radio waves or wireless communication using infrared or visible light (optical wireless).

[0124] The terminal device 40 may simultaneously connect to multiple base stations 20 or multiple cells to perform communication. For example, if one base station 20 can provide multiple cells, the terminal device 40 can perform carrier aggregation by using one cell as a pCell and another cell as an sCell. Furthermore, if multiple base stations 20 can each provide one or multiple cells, the terminal device 40 can realize DC (Dual Connectivity) by using one or multiple cells managed by one base station 20 (MN (e.g., MeNB or MgNB)) as a pCell, or a pCell (PSCell) and sCell(s). DC may also be referred to as MC (Multi Connectivity).

[0125] When a communication area is supported via cells of different base stations 20 (multiple cells having different cell identifiers or the same cell identifier), the multiple cells can be bundled together using carrier aggregation (CA), dual connectivity (DC), or multi-connectivity (MC) technology to enable communication between the base station 20 and the terminal device 40. Alternatively, the terminal device 40 can communicate with the multiple base stations 20 via the cells of the different base stations 20 using coordinated multi-point transmission and reception (CoMP) technology.

[0126] 12 is a diagram illustrating a configuration example of a terminal device 40 according to the present disclosure. The figure is a block diagram illustrating a configuration example of the terminal device 40. The terminal device 40 is a communication device (wireless system) that performs wireless communication with the base station 20. The terminal device 40 is a type of information processing device.

[0127] The terminal device 40 includes a signal processing unit 41, a storage unit 42, an input / output unit 43, and a control unit 44. Note that the configuration shown in the figure is a functional configuration, and the hardware configuration may be different from this. Furthermore, the functions of the terminal device 40 may be distributed and implemented in multiple physically separated components.

[0128] The signal processing unit 41 is a wireless communication interface that performs wireless communication with other communication devices (for example, the base station 20 and other terminal devices 40). The signal processing unit 41 operates under the control of the control unit 44. The signal processing unit 41 supports one or more wireless access methods. For example, the signal processing unit 41 supports both NR and LTE. The signal processing unit 41 may also support other wireless access methods such as W-CDMA (registered trademark) and cdma2000 (registered trademark).

[0129] The signal processing unit 41 includes a reception processing unit 411, a transmission processing unit 412, and an antenna 413. The signal processing unit 41 may include a plurality of reception processing units 411, a transmission processing unit 412, and an antenna 413. When the signal processing unit 41 supports a plurality of radio access methods, each unit of the signal processing unit 41 may be configured individually for each radio access method. For example, the reception processing unit 411 and the transmission processing unit 412 may be configured individually for LTE and NR. The configurations of the reception processing unit 411 and the transmission processing unit 412 are similar to those of the reception processing unit 211 and the transmission processing unit 212 of the base station 20.

[0130] The storage unit 42 is a data readable / writable storage device such as a DRAM, an SRAM, a flash memory, a hard disk, etc. The storage unit 42 functions as a storage means of the terminal device 40.

[0131] The input / output unit 43 is a user interface for exchanging information with the user. For example, the input / output unit 43 is an operation device such as a keyboard, a mouse, operation keys, or a touch panel that allows the user to perform various operations. Alternatively, the input / output unit 43 is a display device such as a liquid crystal display (LCD) or an organic electroluminescence display (OLED). The input / output unit 43 may be an audio device such as a speaker or a buzzer. The input / output unit 43 may also be a lighting device such as an LED (Light Emitting Diode) lamp. The input / output unit 43 functions as input / output means (input means, output means, operation means, or notification means) of the terminal device 40.

[0132] The control unit 44 is a controller that controls each unit of the terminal device 40. The control unit 44 is realized by a processor such as a CPU or an MPU. For example, the control unit 44 is realized by the processor executing various programs stored in a storage device inside the terminal device 40 using RAM or the like as a work area. The control unit 44 may also be realized by an integrated circuit such as an ASIC or an FPGA. A CPU, an MPU, an ASIC, and an FPGA can all be considered as controllers.

[0133] The terminal device 40 according to this embodiment has a function of determining whether to perform PDSCH-CJT transmission from control information notified from the base station 20. The terminal device 40 also has a function of determining a transmission destination and / or a transmission method (for example, a feedback pattern, which will be described later) of feedback including information regarding ACK / NACK (for example, HARQ-ACK / NACK) from the control information notified from the base station 20.

[0134] In addition, the terminal device 40 has the function of transmitting feedback including information regarding ACK / NACK (e.g., HARQ-ACK / NACK) to a designated transmitting device at a designated transmission timing based on control information notified by the base station 20.

[0135] <<3. Processing example of communication system>> <3-1. Communication processing example> Figures 13 and 14 are sequence diagrams showing an example of communication processing according to an embodiment of the present disclosure. The communication processing shown in Figures 13 and 14 is performed, for example, between a first transmitting device (an example of a TRP, for example, a base station 20), a second transmitting device (an example of a TRP, for example, a base station 20), and a receiving device (for example, a terminal device 40). Note that when there is no particular distinction between the first and second transmitting devices, they are also simply referred to as transmitting devices.

[0136] 13, the first transmitting device notifies the receiving device of static initial information (step S101). The first transmitting device notifies the receiving device of static initial information in order to establish communication with the receiving device.

[0137] Here, the first transmitting device transmits static information to the receiving device, and this static information preferably includes the minimum information used to establish communication.

[0138] The static initial information may include, for example, at least one of the following information: - information about synchronization - information about the physical broadcast channel (PBCH) - information about cell selection - information for the receiving device to connect with the transmitting device.

[0139] The information related to synchronization includes, for example, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The information for connecting the receiving device to the transmitting device includes, for example, an initial connection and a random access channel (RACH).

[0140] The static initial information may be divided into multiple parts and transmitted. The notification of the static initial information may be transmitted aperiodically or periodically so as to be received by a receiving device.

[0141] Next, the receiving device notifies the first transmitting device of its capability (step S102). The receiving device transmits its own capability to the first transmitting device. This capability includes information about the M-DCI M-TRP PDSCH-CJT.

[0142] That is, this capability may include, for example, information about CJT communication using M-DCI in the receiving device. For example, this capability may include information indicating whether the receiving device can perform CJT communication using M-DCI.

[0143] Furthermore, the capability may include, for example, at least one of the following information: - Identification information relating to the unique identification of the receiving device - Information relating to the frequency band in which communication is possible

[0144] This notification of the capability may be transmitted during the process of initial connection between the receiving device and the first transmitting device. For example, the notification of the capability may be performed in a process corresponding to, for example, RACH or PRACH (Physical Random Access Channel). Furthermore, this capability may be notified in multiple parts.

[0145] The first transmitting device notifies the receiving device of semi-static control information (step S103). This semi-static control information is information related to M-DCI M-TRP PDSCH-CJT. That is, this semi-static control information may include, for example, information for the receiving device to perform CJT communication using M-DCI. The semi-static control information is cell-specific, bandwidth-specific, or transmitting device-dependent information.

[0146] The first transmitting device generates semi-static control information based on the capability acquired from the receiving device and notifies the receiving device. The semi-static control information is notified from the first transmitting device to the receiving device for, for example, at least one of the following purposes: - Notifying additional information for establishing communication - Sharing CJT information for realizing M-DCI M-TRP PDSCH-CJT between the receiving device and the first transmitting device (and / or the second transmitting device) - Notifying implementation information regarding whether to implement M-DCI M-TRP PDSCH-CJT - Notifying transmission information regarding the HARQ-ACK / NACK transmission method

[0147] (CJT Information) CJT information for realizing M-DCI M-TRP PDSCH-CJT may include, for example, at least one of the following information: - Information related to the DL-Band width part (BWP) used - Information related to HARQ - Information related to the association between a transmitting device that transmits dynamic control information and a transmitting device that transmits semi-static control information

[0148] The information related to HARQ includes, for example, at least one of information related to Code Block Group (CBG)-based HARQ-ACK / NACK and information related to the number of HARQ processes used.

[0149] The related information may include, for example, information used by the receiving device to determine whether dynamic control information (described later) is transmitted from the first transmitting device or the second transmitting device. For example, the related information may include TCI-state or QCL.

[0150] Information for realizing M-DCI, M-TRP, and PDSCH-CJT can be transmitted using, for example, some or all of the following parameters: - BWP-Downlink - PDCCH-config - PDSCH-config - AddmodList - CoRESET (Control REsource SET)

[0151] (Implementation Information) The implementation information regarding whether or not to implement M-DCI M-TRP PDSCH-CJT can be given explicitly or implicitly.

[0152] When the implementation information is explicitly notified, for example, the first transmitting device notifies the receiving device of the implementation information as one of the upper layer messages. Alternatively, the first transmitting device may notify the receiving device of determination information for determining whether to implement M-DCI M-TRP PDSCH-CJT by referring to information included in dynamic control information described later. This determination information may be notified, for example, as one of the upper layer messages.

[0153] The method of explicitly notifying the implementation information is not limited to the above-described method, and the first transmitting device may explicitly notify the receiving device of the implementation information by any method.

[0154] When the implementation information is implicitly notified, for example, the first transmitting device notifies the implementation information using the PDCCH-Config. For example, suppose that PDCCH-Configs having two different CoRESET IDs have the same value of TCI-State ID, and one of the CoRESETs indicated by each CoRESET ID in the PDCCH-Config has a TCI-Sate with the same value as the TCI-Sate indicated by that TCI-Sate ID. In this case, the receiving device determines that the M-DCI M-TRP PDSCH-CJT is implemented.

[0155] Alternatively, if PDCCH-Configs with two different CoRESET IDs have the same QCL-state, and one of the CoRESETs indicated by each CoRESET ID in the PDCCH-Config has a QCL-state with the same value as the QCL-state, the receiving device determines that M-DCI M-TRP PDSCH-CJT is implemented.

[0156] The method of implicitly notifying the implementation information is not limited to the above-described method, and the first transmitting device may implicitly notify the receiving device of the implementation information by any method.

[0157] (Transmission Information) The transmission information regarding the HARQ-ACK / NACK transmission method can be done explicitly or implicitly.

[0158] When the transmission information is explicitly notified, for example, the first transmitting device notifies the receiving device of the transmission information as one of the upper layer messages. Alternatively, the first transmitting device may notify the receiving device of the determination information for determining the transmission method of the HARQ-ACK / NACK by referring to information included in dynamic control information described later. This determination information may be notified, for example, as one of the upper layer messages.

[0159] When the transmission information is explicitly notified, for example, the first transmitting device may associate the HARQ-ACK / NACK transmission method with a pattern (bit pattern) composed of bits and notify the receiving device. For example, when there are four patterns (first to fourth feedback patterns) of the HARQ-ACK / NACK transmission method as described later, the first transmitting device associates each pattern with a bit pattern composed of two bits (for example, "00", "01", "10", and "11") and notifies the receiving device of the bit pattern.

[0160] Note that the number of bits, the number of patterns of the transmission method, etc. are merely examples and are not limited to these. Furthermore, the method of explicitly notifying the transmission information is not limited to the above-described method. The first transmitting device may explicitly notify the receiving device of the transmission information by any method.

[0161] Furthermore, the transmission information may be implicitly notified from the first transmitting device to the receiving device.

[0162] The notification of the transmission information may be performed within a standard process performed between the receiving device and the first transmitting device. The notification of the transmission information may also be performed in multiple steps. For example, the notification of the transmission information may be performed within a process of the PRACH, the RACH, RRC Connection Reconfiguration, RRC Reconfiguration Establishment, or RRC Reconfiguration.

[0163] The receiving device that has received the semi-static control information in step S103 performs semi-static configuration (step S104). Based on the semi-static control information, the receiving device performs semi-static configuration for the M-DCI M-TRP PDSCH-CJT. For example, as described above, the receiving device performs semi-static configuration based on information that has been explicitly or implicitly notified. For example, the receiving device performs configuration related to the frequency, BWP, etc. used in the M-DCI M-TRP PDSCH-CJT.

[0164] Next, the first transmitting device notifies the receiving device of the dynamic control information (step S105), and the second transmitting device notifies the receiving device of the dynamic control information (step S106).

[0165] This dynamic control information includes information about the M-DCI M-TRP PDSCH-CJT depending on the transmitter (first transmitter or second transmitter). The dynamic control information is UE-specific and / or UE-group specific information.

[0166] The dynamic control information includes, for example, at least one of the following information: HARQ information related to HARQ, coding information related to coding, resource information related to resources used, device information related to the transmitting device that transmitted the control information, device-related information for linking the control information received on the receiving device side with the transmitting device that transmitted the control information, and timing information related to the transmission timing of the PDSCH-CJT.

[0167] (HARQ Information) HARQ information related to HARQ is information related to error correction processing. The HARQ information includes, for example, at least one of the following information: - Process information for managing the HARQ process - Redundancy Version (RV) - Information related to the transmission timing of HARQ-ACK / NACK

[0168] The process information includes, for example, a HARQ Process ID or an identifier similar thereto. The redundancy version is an example of bit information indicating a data signal transmitted using the PDSCH-CJT. The information regarding the transmission timing of the HARQ-ACK / NACK includes, for example, information indicated by a DSCH-to-HARQ_feedback timing indicator or K1 (see FIG. 5).

[0169] (Encoding Information) Encoding information related to encoding includes, for example, information related to at least one of the order of modulation and the encoding rate used.

[0170] (Device-related information) Device-related information for linking the control information received on the receiving device side with the transmitting device that transmitted the control information includes, for example, information specifying an identifier of a TCI-state, a QCL-state, or a list composed of multiple of these.

[0171] Note that the transmission information regarding the HARQ-ACK / NACK transmission method may be signaled in the dynamic control information here, in addition to or instead of the semi-static control information in the above-described step S103. For example, when the transmission information is signaled by the dynamic control information, the transmission information may be signaled explicitly or implicitly.

[0172] When the transmission information is explicitly notified by dynamic control information, for example, the transmitting device notifies the receiving device of the transmission information as one of the physical layer control messages. This control message may be notified to the receiving device by one transmitting device (e.g., the first transmitting device or the second transmitting device). Alternatively, this control message may be notified to the receiving device by some or all of the transmitting devices.

[0173] In addition, when not all transmitting devices transmit control messages including transmission information, it is desirable that the receiving device knows in advance information about the transmitting devices that will notify the control messages. This information about the transmitting devices may be notified explicitly or implicitly by, for example, semi-static control information, or may be notified by other methods.

[0174] When transmission information is explicitly notified by dynamic control information, the transmitting device may, for example, associate the HARQ-ACK / NACK transmission method with a pattern (bit pattern) composed of bits and notify the receiving device of the association. For example, when the HARQ-ACK / NACK transmission method has four patterns (first to fourth feedback patterns) as described below, the transmitting device associates each pattern with a bit pattern composed of two bits (for example, "00", "01", "10", and "11") and notifies the receiving device of the bit pattern.

[0175] Note that the number of bits, the number of patterns of the transmission method, etc. are merely examples and are not limited to these. Furthermore, the method of explicitly notifying the transmission information using dynamic control information is not limited to the above-described method. The transmitting device can explicitly notify the receiving device of the transmission information using dynamic control information in any manner.

[0176] When the transmission information is notified implicitly, the receiving device may determine the transmission method of the HARQ-ACK / NACK based on, for example, the HARQ information related to the HARQ described above. This determination method will be described later.

[0177] It should be noted that the dynamic control information can be notified separately for each Carrier Component (CC) and BWP.

[0178] As shown in Fig. 13, the receiving device performs dynamic configuration based on the received dynamic control information (step S107). As described above, the dynamic control information is notified explicitly or implicitly. The receiving device performs dynamic configuration for the M-DCI M-TRP PDSCH-CJT based on the dynamic control information acquired from the first and second transmitting devices.

[0179] The receiving device sets, for example, at least one of the following information: - Information on the frequency to be used and BWP - Information on the transmission method of HARQ-ACK / NACK - Information on the transmission timing of PDSCH-CJT - Information on the modulation method - Information on the destination to which the feedback signal is to be transmitted

[0180] The information about the destination to which the feedback signal is to be sent includes, for example, a method for selecting one representative sending device (destination).

[0181] The first and second transmitting devices transmit the downlink PDSCH-CJT (step S108). In this case, for example, a plurality of base stations 20 communicate with the terminal device 40.

[0182] The first and second transmitting devices transmit PDSCH-CJTs in cooperation with each other. The receiving device determines the number of PDSCH-CJTs to be transmitted and the transmission timing based on the settings made in step S107 in accordance with the dynamic control information.

[0183] Next, the receiving device decodes the received PDSCH-CJT and performs processing related to ARQ / HARQ (step S109). The receiving device decodes the PDSCH-CJT in accordance with the settings made based on the dynamic control information, and obtains the decoding result.

[0184] The decoding result is information indicating whether decoding has been performed correctly in units of Transport Blocks or CBGs, for example. The unit (Transport Block or CBG) for obtaining the decoding result is preferably notified in advance as part of semi-static control information.

[0185] The receiving device transmits an ACK / NACK including the processing result of step S109 (step S110). The receiving device feeds back the decoding result (HARQ-ACK / NACK feedback) to the transmitting device by a method specified by the semi-static control information and / or dynamic control information. Note that it is assumed here that an error has occurred in the decoding result.

[0186] 13, the receiving device transmits an ACK / NACK to the first transmitting device, but the destination of the ACK / NACK is not limited to the first transmitting device. The destination of the ACK / NACK will be described in detail later.

[0187] The receiving device may notify the transmitting device of the decoding results of multiple PDSCH-CJTs in one ACK / NACK transmission in step S110. The transmission of the ACK / NACK may be performed using, for example, a PUSCH (Physical Uplink Shared Channel) or a PUCCH (Physical Uplink Control Channel).

[0188] The ACK / NACK may be transmitted as part of an Uplink Control Indicator (UCI), or may be transmitted as an independent element separate from the UCI.

[0189] When the first transmitting device receives an ACK / NACK from the receiving device, the first transmitting device performs processing related to ARQ / HARQ (step S111). Based on the received ACK / NACK, the first transmitting device determines whether to perform retransmission. Here, as described above, the first transmitting device receives an ACK / NACK as a decoding result indicating that an error has occurred in the received data.

[0190] Therefore, the first transmitting device determines to perform retransmission and performs transmission processing (retransmission processing) including coded modulation again. This retransmission processing may be performed independently for each transmitting device.

[0191] For example, the first transmitting device may determine whether the second transmitting device should retransmit and perform the retransmission process. Alternatively, the first transmitting device may transfer the received ACK / NACK to the second transmitting device, and the second transmitting device may determine whether the second transmitting device should retransmit and perform the retransmission process. Alternatively, the first transmitting device may determine whether the second transmitting device should retransmit and notify the second transmitting device of the determination result. Upon receiving the notification to perform retransmission, the second transmitting device performs the retransmission process.

[0192] 14, the first transmitting device notifies the receiving device of dynamic control information (step S112), and the second transmitting device notifies the receiving device of dynamic control information (step S113).

[0193] This dynamic control information may include information similar to the control information sent in steps S105 and S106.

[0194] The receiving device performs dynamic configuration based on the received dynamic control information (step S114), in the same manner as in step S107.

[0195] The first and second transmitting devices transmit the downlink PDSCH-CJT (step S115). This transmission is performed in the same manner as in step S108.

[0196] The receiving device decodes the received PDSCH-CJT and performs processing related to ARQ / HARQ (step S116). This processing is performed in the same manner as in step S109.

[0197] The receiving device transmits an ACK / NACK including the processing result of step S116 (step S117). This processing is performed in the same manner as step S110. Note that it is assumed here that no errors have occurred in the decoding result. The transmission pattern (feedback pattern) of the ACK / NACK at this time may be different from that of step S110. Details of the feedback pattern will be described later.

[0198] When the first transmitting device receives the ACK / NACK from the receiving device, it performs processing related to ARQ / HARQ (step S118). Based on the received ACK / NACK, the first transmitting device determines whether to perform retransmission. Here, as described above, the first transmitting device receives the ACK / NACK as a decoding result indicating that no error has occurred in the received data.

[0199] Therefore, the first transmitting device determines not to perform retransmission and ends transmission (step S119).

[0200] Note that, here, the first and second transmitting devices that transmitted the PDSCH-CJT the first time (step S108) similarly retransmit the PDSCH-CJT, but the transmitting device that retransmits the PDSCH-CJT is not limited to the transmitting device that transmitted the PDSCH-CJT the first time. For example, a third or fourth transmitting device (not shown) may transmit the PDSCH-CJT. Alternatively, the second transmitting device may retransmit the data that was initially transmitted by the first transmitting device.

[0201] In this way, the transmitting device that transmits the PDSCH-CJT the first time and the transmitting device that transmits the PDSCH-CJT at the time of retransmission may be different. By having different transmitting devices retransmit the PDSCH-CJT, the communication system may be able to reduce reception errors at the time of retransmission, for example.

[0202] Here, at least a part of the various information to be transmitted by the first transmitting device may be transmitted from the second transmitting device. For example, at least one of the static initial information and the quasi-static control information may be notified from the second transmitting device to the receiving device.

[0203] <3-2. Examples of Transmission of Control Information> The above-mentioned dynamic control information transmission method is classified into several patterns (here, first to fourth control patterns). An example of each control pattern will be described below.

[0204] (First Control Pattern) Fig. 15 is a diagram illustrating an example of a first control pattern according to an embodiment of the present disclosure. As illustrated in Fig. 15, in the first control pattern, the first and second transmission devices transmit first control information.

[0205] The first control information transmitted by the first transmitting device and the first control information transmitted by the second transmitting device include the same information related to error correction processing. For example, the first control information transmitted by the first transmitting device and the first control information transmitted by the second transmitting device include the same process information (e.g., HARQ process identifier) ​​for managing the feedback process.

[0206] The first control information transmitted by the first transmitting device and the first control information transmitted by the second transmitting device include the same bit information indicating coded bits transmitted as a data signal using PDSCH-CJT. For example, the redundancy version included in the first control information transmitted by the first transmitting device and the first control information transmitted by the second transmitting device are the same.

[0207] (Second Control Pattern) Fig. 16 is a diagram illustrating an example of a second control pattern according to an embodiment of the present disclosure. As shown in Fig. 16, in the first control pattern, the first transmission device transmits the second control information, and the second transmission device transmits the third control information.

[0208] The second control information transmitted by the first transmitting device and the third control information transmitted by the second transmitting device include the same information related to error correction processing. For example, the first control information transmitted by the first transmitting device and the third control information transmitted by the second transmitting device include the same identifier of process information (e.g., HARQ process identifier) ​​for managing the feedback process.

[0209] The second control information transmitted by the first transmitting device and the third control information transmitted by the second transmitting device have different bit information indicating coded bits transmitted as a data signal using PDSCH-CJT. For example, the redundancy version included in the second control information transmitted by the first transmitting device is different from the redundancy version included in the third control information transmitted by the second transmitting device.

[0210] (Third Control Pattern) Fig. 17 is a diagram illustrating an example of a third control pattern according to an embodiment of the present disclosure. As illustrated in Fig. 17, in the third control pattern, the first transmitting device transmits the fourth control information, and the second transmitting device transmits the fifth control information.

[0211] The fourth control information transmitted by the first transmitting device and the fifth control information transmitted by the second transmitting device have different information related to error correction processing. For example, the process information (e.g., HARQ process identifier) ​​for managing the feedback process included in the fourth control information transmitted by the first transmitting device is different from the process information (e.g., HARQ process identifier) ​​for managing the feedback process included in the fifth control information transmitted by the second transmitting device.

[0212] The fourth control information transmitted by the first transmitting device and the fifth control information transmitted by the second transmitting device include the same bit information indicating coded bits transmitted as a data signal using PDSCH-CJT. For example, the redundancy version included in the first control information transmitted by the first transmitting device and the first control information transmitted by the second transmitting device are the same.

[0213] (Fourth Control Pattern) Fig. 18 is a diagram illustrating an example of a fourth control pattern according to an embodiment of the present disclosure. As shown in Fig. 18, in the fourth control pattern, the first transmitting device transmits the sixth control information, and the second transmitting device transmits the seventh control information.

[0214] The sixth control information transmitted by the first transmitting device and the seventh control information transmitted by the second transmitting device have different information related to error correction processing. For example, the process information (e.g., HARQ process identifier) ​​for managing the feedback process included in the sixth control information transmitted by the first transmitting device is different from the process information (e.g., HARQ process identifier) ​​for managing the feedback process included in the seventh control information transmitted by the second transmitting device.

[0215] The sixth control information transmitted by the first transmitting device and the seventh control information transmitted by the second transmitting device have different bit information indicating coded bits transmitted as a data signal using PDSCH-CJT. For example, the redundancy version included in the sixth control information transmitted by the first transmitting device is different from the redundancy version included in the seventh control information transmitted by the second transmitting device.

[0216] <3-3. Example of Feedback Transmission> For example, like the above-mentioned ACK / NACK, the receiving device transmits a feedback signal (hereinafter also simply referred to as feedback) for data transmission using PDSCH, PDSCH-CJT, or the like.

[0217] In this way, feedback is performed for data transmission scheduled in advance by control information notified by the transmitting device. Hereinafter, it is assumed that the feedback signal includes information (including, for example, ACK / NACK or HARQ-ACK / NACK) indicating whether a packet for data communication (for example, a data signal) has been correctly decoded, but the feedback signal does not necessarily need to include information indicating whether the packet has been correctly decoded.

[0218] Feedback may be performed for each arrival of a single PDSCH-CJT, or the receiving device may transmit feedback for multiple PDSCH-CJTs in any one of the transmission opportunities (e.g., corresponding to the arrival of any one of the multiple PDSCH-CJTs).

[0219] An example of the HARQ process identifier in this embodiment is an HARQ process ID.

[0220] The ACK / NACK feedback information for the transmitted Code Block (CB) / Code Block Group (CBG) may be linked to specific information.

[0221] This specific information may be, for example, an HARQ process identifier or RV. In this case, the transmitting device that has received the feedback can determine which HARQ process identifier and / or RV the ACK / NACK information corresponds to.

[0222] As a linking method, there is a method of allocating information corresponding to an HARQ process identifier and / or RV to a specific location of a feedback signal. For example, the bit length of the feedback signal is assumed to be N (N is a natural number). In this case, the receiving device allocates feedback information corresponding to one HARQ process identifier (or RV) from the leading 0 bit to (N / 2)-1 bits. Furthermore, the receiving device allocates feedback information corresponding to another HARQ process identifier (or RV) from N / 2 bits to N-1 bits.

[0223] Note that the linking method described above is an example, and the number of HARQ process identifiers (or RVs) to be assigned is not limited to 2. The number of HARQ process identifiers (or RVs) to be assigned may be 1 or 3 or more. Furthermore, the method of assigning feedback information to specific information is not limited to the above-described method.

[0224] The receiving device may also notify the transmitting device of information regarding the linking method. For example, the receiving device may notify the transmitting device of information indicating a linking method selected from a plurality of predetermined linking methods by including the information in the feedback.

[0225] The receiving device performs feedback in accordance with the control information notified by the transmitting device. There are several patterns (first to fourth feedback patterns) for this feedback method. An example of each feedback pattern will be described below.

[0226] (First Feedback Pattern) The first feedback pattern is a method in which the receiving device returns feedback individually to the transmitting devices (for example, the first and second transmitting devices) that have transmitted the dynamic control information.

[0227] 19 is a diagram illustrating an example of a first feedback pattern according to an embodiment of the present disclosure. As illustrated in FIG. 19 , in the first feedback pattern, a receiving device transmits first feedback to a first transmitting device and transmits second feedback to a second transmitting device.

[0228] Specifically, after receiving one or more PDSCH-CJTs (not shown), the receiving device transmits feedback (first and second feedbacks in FIG. 19) to the first and second transmitting devices, respectively.

[0229] For example, a receiving device that receives control information transmitted according to any one of the first to fourth control patterns described above feeds back different ACK / NACK information to the first and second transmitting devices, respectively, i.e., the first feedback signal transmitted in the first feedback and the second feedback signal transmitted in the second feedback are different.

[0230] More specifically, the receiving device notifies the first transmitting device of a first feedback including first ACK / NACK information (an example of a response signal indicating whether the data signal has been correctly received), and the receiving device notifies the second transmitting device of a second feedback including second ACK / NACK information (an example of a response signal indicating whether the data signal has been correctly received) different from the first ACK / NACK information.

[0231] The ACK / NACK information to be transmitted can be linked to the CB / CBG included in the PDSCH-CJT and fed back.

[0232] For example, let the total number of CBs / CBGs be N_1 (N_1 is a natural number), and the receiving device transmits M_(N_1) feedbacks (e.g., feedback signals) with each ACK / NACK. In this case, the receiving device transmits M_(n_1), which is feedback for CB / CBG group n_1 consisting of any n CBs / CBGs out of N_1, to the first transmitting device. The receiving device transmits feedback for the remaining CBs / CBGs to the second transmitting device.

[0233] n may be selected by any method. For example, if the number of transmitting devices used in CJT transmission is X, n may be selected using this X. For example, n may be expressed as n = N_1 / X. Also, n may be specified directly by notification from the base station 20 or by static control information. Also, n may be determined by the receiving device through some process based on notification from the base station 20 or static control information.

[0234] The n CBs / CBGs to be selected may be selected by any method. The receiving device may randomly select n CBs / CBGs. Alternatively, the receiving device may select n CBs / CBGs from the most significant bits (MSBs) or least significant bits (LSBs) of the CBs / CBGs that make up a TB. Alternatively, the receiving device may select CBs / CBGs that are explicitly specified by information notified from the base station 20 or static information.

[0235] In addition, a receiving device that acquires control information transmitted according to one of the second and fourth control patterns (each control information containing a different RV) may select n CBs / CBGs based on information related to the RV.

[0236] For example, the receiving device may transmit, to the first transmitting device, information regarding ACK / NACK for a CB / CBG having the same RV as the RV included in the control information notified by the first transmitting device. Also, for example, the receiving device may transmit, to the second transmitting device, information regarding ACK / NACK for a CB / CBG having the same RV as the RV included in the control information notified by the second transmitting device. In this case, the CB / CBG and the RV may be linked by any method.

[0237] Furthermore, the receiving device may not feed back information regarding ACK / NACK to a transmitting device that has transmitted control information that does not contain information regarding RV.

[0238] In addition, a receiving device that acquires control information transmitted according to one of the third and fourth control patterns (each control information having a different HARQ process identifier) ​​may select n CBs / CBGs based on information related to the HARQ process identifier.

[0239] For example, the receiving device may transmit, to the first transmitting device, information regarding ACK / NACK for a CB / CBG having the same HARQ process identifier as the HARQ process identifier included in the control information notified by the first transmitting device. Furthermore, for example, the receiving device may transmit, to the second transmitting device, information regarding ACK / NACK for a CB / CBG having the same HARQ process identifier as the HARQ process identifier included in the control information notified by the second transmitting device. In this case, the CB / CBG and the HARQ process identifier may be linked in any manner.

[0240] Furthermore, the receiving device may not feed back information related to ACK / NACK to a transmitting device that has transmitted control information that does not contain information related to an HARQ process identifier.

[0241] This first feedback pattern is characterized in that the feedback information transmitted to each transmitting device does not overlap between the transmitting devices. In other words, the receiving device distributes and transmits just the right amount of feedback information to each transmitting device. This allows the receiving device to reduce the amount of feedback information transmitted to a single transmitting device.

[0242] The receiving device may perform this feedback (eg, signaling this feedback) for each BWP or CC used.

[0243] In addition, when control information is transmitted according to the fourth control pattern, the selection of n CBs / CBGs may be made based on information related to the RV, or may be made based on information related to the HARQ Process identifier.

[0244] The information on which this selection is based may be explicitly notified from the base station 20. For example, the base station 20 may notify the information used for selection using higher layer signaling such as RRC signaling or physical layer control information such as DCI, or may notify by other methods. Furthermore, this notification may be performed for each BWP or CC used.

[0245] The receiving device may implicitly determine the information used for this selection, for example, the receiving device may select CB / CBG based on information related to the HARQ process identifier whenever the HARQ process identifiers are different.

[0246] Furthermore, when control information is transmitted according to the fourth control pattern, the division method of ACK / NACK bits may be determined according to the RV, and the transmitting device that transmits feedback may be determined according to the identifier of the HARQ process. In this way, the receiving device performs feedback according to the information of the control information.

[0247] (Second Feedback Pattern) The second feedback pattern is a method in which the receiving device transmits the same feedback to the transmitting devices (for example, the first and second transmitting devices).

[0248] 20 is a diagram illustrating an example of a second feedback pattern according to an embodiment of the present disclosure. As illustrated in FIG. 20 , in the second feedback pattern, the receiving device transmits a third feedback to the first transmitting device and transmits a third feedback to the second transmitting device.

[0249] In this case, it is desirable that the third feedback (more specifically, the third feedback signal) includes all of the feedback information to be transmitted to the first and second transmitting devices.

[0250] In this second feedback pattern, the feedback destined for the first and second transmitters contains the same information. Therefore, the receiver can obtain redundancy by spatially dividing the feedback. In other words, although the amount of feedback information sent to each transmitter increases, the receiver can achieve more reliable feedback than with other patterns.

[0251] (Third Feedback Pattern) The third feedback pattern is a method in which a receiving device transmits feedback including information related to ACK / NACK (hereinafter also simply referred to as ACK / NACK information) to one transmitting device (e.g., one of the first and second transmitting devices), and transmits feedback not including ACK / NACK information to the remaining transmitting device (e.g., the other of the first and second transmitting devices). In this pattern, the feedback signal transmitted to one transmitting device is different from the feedback signal transmitted to the other transmitting device.

[0252] 21 is a diagram illustrating an example of a third feedback pattern according to an embodiment of the present disclosure. As illustrated in FIG. 21 , in the third feedback pattern, the receiving device transmits a fourth feedback to the first transmitting device and a fifth feedback to the second transmitting device.

[0253] Here, it is assumed that the fourth feedback includes ACK / NACK information (an example of a response signal indicating whether or not a data signal has been correctly received), and the fifth feedback does not include ACK / NACK information. Note that feedback including ACK / NACK information is not limited to the fourth feedback. ACK / NACK information may be included in the fifth feedback instead of the fourth feedback. In this case, the fourth feedback does not include ACK / NACK information.

[0254] The receiving device may determine, based on signaling from the transmitting device, a transmitting device (here, the second transmitting device) that will transmit feedback that does not include ACK / NACK information.

[0255] For example, the receiving device may determine a transmitting device that transmits feedback that does not include ACK / NACK information based on higher layer signaling, such as RRC signaling, or physical layer control information, such as DCI, transmitted by the transmitting device. Alternatively, information regarding a transmitting device that transmits feedback that does not include ACK / NACK information may be notified from the transmitting device to the receiving device by other methods.

[0256] The receiving device may determine a transmitting device (here, the second transmitting device) that transmits feedback that does not include ACK / NACK information, based on information related to communication quality, such as reception strength.

[0257] For example, the receiving device transmits a fourth feedback including ACK / NACK information to a first transmitting device having the best communication quality among the communication qualities between the receiving device and the first and second transmitting devices, and transmits a fifth feedback without ACK / NACK information to another transmitting device (here, the second transmitting device).

[0258] Here, examples of communication qualities that a receiving device uses to select a transmitting device include signal to noise ratio (SNR), signal interference noise ratio (SINR), reference signal received power (RSRP), channel quality indicator (CQI), and modulation and coding scheme (MCS).

[0259] Note that the communication qualities used by the receiving device to select a transmitting device are not limited to these, and the receiving device may select a transmitting device to transmit feedback including ACK / NACK information using any communication quality.

[0260] In addition, a receiving device that acquires control information transmitted according to one of the second and fourth control patterns (each control information having a different RV) may determine a transmitting device to transmit feedback including (or not including) ACK / NACK information based on information related to the RV.

[0261] For example, feedback including ACK / NACK information may be sent to the transmitting device that sent the control information having the smallest (or largest) RV among the different RVs contained in the control information sent from the first and second transmitting devices.

[0262] Furthermore, the receiving device may perform feedback that does not include ACK / NACK information to a transmitting device that has transmitted control information that does not include information about RV. In this case, the receiving device performs feedback that includes ACK / NACK information to a transmitting device that has transmitted control information that includes information about RV.

[0263] Furthermore, a receiving device that acquires control information transmitted according to one of the third and fourth control patterns (each control information having a different HARQ process identifier) ​​may determine a transmitting device to transmit feedback including (or not including) ACK / NACK information based on information related to the HARQ process identifier.

[0264] For example, feedback including ACK / NACK information may be transmitted to the transmitting device that transmitted the control information having the HARQ process identifier with the smallest (or largest) value among the different HARQ process identifiers contained in the control information transmitted from the first and second transmitting devices.

[0265] Furthermore, the receiving device may perform feedback that does not include ACK / NACK information to a transmitting device that has transmitted control information that does not include information about an HARQ process identifier. In this case, the receiving device may perform feedback that includes ACK / NACK information to a transmitting device that has transmitted control information that includes information about an HARQ process identifier.

[0266] The receiving device may perform this feedback (eg, signaling this feedback) for each BWP or CC used.

[0267] In addition, when control information is transmitted according to the fourth control pattern, the decision of the transmitting device to transmit feedback including (or not including) ACK / NACK information may be made based on information related to the RV or may be made based on information related to the HARQ Process identifier.

[0268] The information on which this determination is based may be explicitly notified from the base station 20. For example, the base station 20 may notify the information used for the determination using higher layer signaling such as RRC signaling or physical layer control information such as DCI, or may notify by other methods. Furthermore, this notification may be performed for each BWP or CC used.

[0269] The receiving device may implicitly determine the information used for this determination, for example, the receiving device may base its determination of the transmitting device on information related to the HARQ process identifier whenever the HARQ process identifiers are different.

[0270] In this third feedback pattern, the receiving device transmits ACK / NACK information to one transmitting device. This allows the receiving device to reduce the amount of ACK / NACK information transmitted. Furthermore, the receiving device transmits feedback other than ACK / NACK to other transmitting devices. This allows the receiving device to provide necessary information to all transmitting devices through feedback even when the connection between transmitting devices, such as M-DCI MTRP, is non-ideal.

[0271] (Fourth Feedback Pattern) The fourth feedback pattern is a method in which a receiving device transmits feedback to one of a plurality of transmitting devices (for example, a first or second transmitting device).

[0272] 22 is a diagram illustrating an example of a fourth feedback pattern according to an embodiment of the present disclosure. As illustrated in FIG. 22 , in the fourth feedback pattern, the receiving device transmits sixth feedback to the first transmitting device and does not transmit feedback to the second transmitting device.

[0273] The transmitting device that transmits the feedback (e.g., UCI) may be determined by explicit notification from the base station 20. For example, the base station 20 may notify the transmitting device that transmits the feedback using higher layer signaling such as RRC signaling, physical layer control information such as DCI, or other methods. This notification may also be performed for each BWP or CC used.

[0274] This notification may be performed implicitly. The receiving device may determine the transmitting device (here, the first transmitting device) to which the feedback is to be sent based on information about communication quality, such as reception strength.

[0275] For example, the receiving device transmits the sixth feedback to the first transmitting device that has the best communication quality among the communication qualities between the receiving device and the first and second transmitting devices, and does not transmit feedback to the other transmitting devices (here, the second transmitting device).

[0276] Here, examples of communication qualities that a receiving device uses to select a transmitting device include signal to noise ratio (SNR), signal interference noise ratio (SINR), reference signal received power (RSRP), channel quality indicator (CQI), and modulation and coding scheme (MCS).

[0277] Note that the communication qualities used by the receiving device to select a transmitting device are not limited to these, and the receiving device may select a transmitting device to transmit feedback using any communication quality.

[0278] For example, a receiving device that acquires control information transmitted according to one of the second and fourth control patterns (each control information containing a different RV) may determine the transmitting device to which feedback should be sent based on information related to the RV.

[0279] For example, feedback may be sent to the transmitting device that transmitted the control information having the smallest (or largest) RV among the different RVs contained in the control information transmitted from the first and second transmitting devices.

[0280] The receiving device may also be configured not to provide feedback to a transmitting device that has transmitted control information without information about RVs. In this case, the receiving device provides feedback to, for example, a transmitting device (or one of multiple transmitting devices) that has transmitted control information with information about RVs.

[0281] Furthermore, a receiving device that acquires control information transmitted according to one of the third and fourth control patterns (each control information having a different HARQ process identifier) ​​may determine a transmitting device to which feedback should be transmitted based on information related to the HARQ process identifier.

[0282] For example, feedback may be transmitted to the transmitting device that transmitted the control information having the HARQ process identifier with the smallest (or largest) value among the different HARQ process identifiers contained in the control information transmitted from the first and second transmitting devices.

[0283] Furthermore, the receiving device may not provide feedback to a transmitting device that has transmitted control information that does not include information about an HARQ process identifier. In this case, the receiving device provides feedback to, for example, a transmitting device (or one of a plurality of transmitting devices) that has transmitted control information that includes information about an HARQ process identifier.

[0284] The receiving device may perform this feedback (eg, signaling this feedback) for each BWP or CC used.

[0285] In addition, when control information is transmitted according to the fourth control pattern, the determination of the transmitting device to transmit feedback may be made based on information related to the RV or information related to the identifier of the HARQ process.

[0286] The information on which this determination is based may be explicitly notified from the base station 20. For example, the base station 20 may notify the information used for the determination using higher layer signaling such as RRC signaling or physical layer control information such as DCI, or may notify by other methods. Furthermore, this notification may be performed for each BWP or CC used.

[0287] The receiving device may implicitly determine the information used for this determination, for example, the receiving device may base its determination of the transmitting device on information related to the HARQ process identifier whenever the HARQ process identifiers are different.

[0288] In this fourth feedback pattern, the receiving device transmits feedback to one transmitting device. This method increases the amount of feedback information because all ACK / NACK-related information is fed back to one transmitting device, but the receiving device can further reduce resource occupation due to feedback.

[0289] (Selection of control pattern and feedback pattern) For example, the transmitting device selects one of the first to fourth control patterns described above and notifies the receiving device of dynamic control information. Also, the transmitting device selects one of the first to fourth feedback patterns described above and instructs the receiving device to provide feedback using the selected pattern. Alternatively, the receiving device may select one of the first to fourth feedback patterns described above and provide feedback.

[0290] For example, suppose that the receiving device does not transmit feedback individually to the first and second transmitting devices that transmitted the dynamic control information, i.e., the receiving device transmits feedback to one of the first and second transmitting devices. In this case, the transmitting device selects one of the first to fourth control patterns. Furthermore, the transmitting device (or the receiving device) selects the fourth feedback pattern.

[0291] For example, when a receiving device transmits feedback individually to a first transmitting device and a second transmitting device that have transmitted dynamic control information, the HARQ Process identifiers included in the dynamic control information are different.

[0292] In this case, if the RVs included in the dynamic control information are the same, the transmitting device transmits the dynamic control information to the transmitting device based on the third control pattern. The receiving device selects one of the first to third feedback patterns and performs feedback.

[0293] On the other hand, if the RV included in the dynamic control information is different, the transmitting device transmits the dynamic control information to the transmitting device based on the fourth control pattern. The receiving device selects one of the first to third feedback patterns and performs feedback.

[0294] For example, when a receiving device transmits feedback individually to each of a first and a second transmitting device that transmitted dynamic control information, it is assumed that the HARQ Process identifiers included in the dynamic control information are the same.

[0295] In this case, if the RVs included in the dynamic control information are the same, the transmitting device transmits the dynamic control information to the transmitting device based on the first control pattern, and the receiving device selects one of the first to third feedback patterns and performs feedback.

[0296] On the other hand, if the RV included in the dynamic control information is different, the transmitting device transmits the dynamic control information to the transmitting device based on the second control pattern. The receiving device selects one of the first to third feedback patterns and performs feedback.

[0297] <<4. Application Example>> For example, a transmitting device may execute the above-described M-DCI M-TRP PDSCH-CJT with a receiving device that has been initially connected by PRACH. Here, an example will be described in which a transmitting device executes M-DCI M-TRP PDSCH-CJT with a receiving device that has been initially connected by PRACH.

[0298] 23 and 24 are sequence diagrams showing an example of communication processing according to an application example of an embodiment of the present disclosure. The communication processing shown in Fig. 23 and 24 is executed, for example, between a first transmitting device, a second transmitting device, and a receiving device. Note that, among the communication processing shown in Fig. 23 and 24, processing that is the same as the processing shown in Fig. 13 and 14 is assigned the same reference numerals, and description thereof will be omitted.

[0299] As shown in Fig. 23, the first transmitting device transmits a synchronization signal (SS) / PBCH to the receiving device (step S201). This SS / PBCH includes, for example, an MIB and an SIB1. This SS / PBCH corresponds to, for example, the static initial information notified by the first transmitting device in step S101 of Fig. 13.

[0300] The receiving device transmits PRACH Massage-1 to the first transmitting device (step S202), and the first transmitting device transmits PRACH Massage-2 to the receiving device (step S203).

[0301] The receiving device transmits PRACH Massage-3 to the first transmitting device (step S204), and the first transmitting device transmits PRACH Massage-4 to the receiving device (step S205).

[0302] The first transmitting device transmits RRC reconfiguration to the receiving device (step S206). This RRC reconfiguration corresponds to, for example, the semi-static control information notified by the first transmitting device in step S103 in FIG.

[0303] In response to the RRC reconfiguration, the receiving device transmits an RRC reconfiguration complete to the first transmitting device (step S207).

[0304] The receiving device that has performed the semi-static setting in step S104 receives a PDCCH from the first transmitting device (step S208). This PDCCH includes, for example, dynamic control information for PDSCH-CJT transmission notified by the first transmitting device in step S105.

[0305] The receiving device also receives a PDCCH from the second transmitting device (step S209). This PDCCH includes, for example, dynamic control information for PDSCH-CJT transmission notified by the second transmitting device in step S106.

[0306] In this manner, in this application example, dynamic control information for PDSCH-CJT transmission is notified from the transmitting device to the receiving device using the PDCCH.

[0307] After that, the receiving device that has performed the ARQ / HARQ processing in step S109 transmits HARQ-ACK / NACK feedback to the first transmitting device (step S210). This HARQ-ACK / NACK feedback is assumed to be performed using the PUCCH or PUSCH including the UCI.

[0308] It is assumed here that an error has occurred in the received data as a result of the processing in step S109.

[0309] The first transmitting device, which has performed the ARQ / HARQ processing in step S111, determines to perform retransmission based on the received HARQ-ACK / NACK feedback and transmits a PDCCH to the receiving device (step S211). Also, the second transmitting device transmits a PDCCH to the receiving device (step S212).

[0310] This PDCCH may include dynamic control information, similar to the PDCCH transmitted in steps S209 and S210.

[0311] After that, the receiving device that has executed the ARQ / HARQ-related processing in step S116 transmits HARQ-ACK / NACK feedback to the first transmitting device (step S213). This HARQ-ACK / NACK feedback is assumed to be performed using the PUCCH or PUSCH including UCI, similar to the HARQ-ACK / NACK feedback transmitted in step S210.

[0312] The subsequent processing is the same as the processing in FIG. 14, and therefore a description thereof will be omitted.

[0313] Although the case where the receiving device provides feedback to the first transmitting device using the fourth feedback pattern has been described here, the receiving device may also provide feedback to the second transmitting device using the fourth feedback pattern, or the receiving device may provide feedback according to any of the first to third feedback patterns.

[0314] Note that the application example here is just one example, and the communication system can also apply communication using M-DCI M-TRP PDSCH-CJT to various types of communication, for example, when a receiving device connects after making another initial connection.

[0315] <<5. Other Embodiments>> The above-described embodiment is merely an example, and various modifications and applications are possible.

[0316] For example, in the above-described embodiment, the PDSCH-CJT is transmitted by two transmitting devices, but the number of transmitting devices that transmit the PDSCH-CJT is not limited to two. Three or more transmitting devices may transmit the PDSCH-CJT.

[0317] In this case, for example, at least two of the three or more transmitting devices that transmit the PDSCH-CJT may notify the receiving device of dynamic control information according to the first to fourth control patterns. Alternatively, the transmitting device that transmits the PDSCH-CJT may be different from the transmitting device that transmits the dynamic control information.

[0318] For example, when a transmitting device transmits dynamic control information according to the second to fourth control patterns, and three or more transmitting devices transmit this control information, for example, the RV and / or HARQ Process identifier included in at least one of the transmitted control information may be different from the RV and / or HARQ Process identifier included in the remaining control information.

[0319] Furthermore, for example, suppose that a receiving device transmits feedback to three or more transmitting devices according to a third feedback pattern, in which case, for example, the receiving device transmits feedback including ACK / NACK information to at least one of the three or more transmitting devices, and transmits feedback not including ACK / NACK information to the remaining transmitting devices.

[0320] In this case, when transmitting feedback including ACK / NACK information to two or more transmitting devices, the receiving device transmits feedback in the same manner as, for example, the first or second feedback pattern. For example, the receiving device may transmit feedback including different ACK / NACK information to each of the two or more transmitting devices, or may transmit feedback including the same ACK / NACK information.

[0321] The base station 20 or the control device that controls the terminal device 40 of this embodiment may be realized by a dedicated computer system or a general-purpose computer system.

[0322] For example, a communication program for executing the above-described operations is stored in a computer-readable recording medium such as an optical disk, a semiconductor memory, a magnetic tape, or a flexible disk and distributed. Then, for example, the program is installed in a computer and the above-described processing is executed to configure a control device. In this case, the control device may be a device external to the base station 20 or the terminal device 40 (e.g., a personal computer). Alternatively, the control device may be a device internal to the base station 20 or the terminal device 40 (e.g., the control unit 24 or the control unit 44).

[0323] The communication program may also be stored in a disk device provided in a server device on a network such as the Internet, and may be downloaded to a computer. The above-described functions may also be realized by a combination of an operating system (OS) and application software. In this case, the components other than the OS may be stored on a medium and distributed, or may be stored in a server device and downloaded to a computer.

[0324] Furthermore, among the processes described in the above embodiments, all or part of the processes described as being performed automatically can be performed manually, or all or part of the processes described as being performed manually can be performed automatically using a known method. In addition, the information including the processing procedures, specific names, various data, and parameters shown in the above documents and drawings can be changed as desired unless otherwise specified. For example, the various information shown in each drawing is not limited to the information shown in the drawings.

[0325] Furthermore, the components of each device shown in the figure are conceptual functional units and do not necessarily have to be physically configured as shown. In other words, the specific form of distribution and integration of each device is not limited to that shown in the figure, and all or part of the devices can be functionally or physically distributed and integrated in any unit depending on various loads, usage conditions, etc. Note that this distribution and integration configuration may also be performed dynamically.

[0326] The above-described embodiments can be combined as appropriate within the scope of the present invention without causing any inconsistency in the processing content. The order of the steps shown in the sequence diagrams of the above-described embodiments can be changed as appropriate.

[0327] Furthermore, for example, the present embodiment can also be implemented as any configuration that constitutes an apparatus or system, such as a processor as a system LSI (Large Scale Integration), a module using multiple processors, a unit using multiple modules, a set in which other functions are added to a unit, or the like (i.e., a configuration of a part of an apparatus).

[0328] In this embodiment, a system refers to a collection of multiple components (devices, modules (components), etc.), regardless of whether all of the components are in the same housing. Therefore, multiple devices housed in separate housings and connected via a network, and a single device in which multiple modules are housed in a single housing, are both systems.

[0329] Furthermore, for example, this embodiment can have a cloud computing configuration in which one function is shared and processed jointly by a plurality of devices via a network.

[0330] <<6. Conclusion>> Although the embodiments of the present disclosure have been described above, the technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present disclosure. Furthermore, components of different embodiments and modifications may be combined as appropriate.

[0331] Furthermore, the effects of each embodiment described in this specification are merely examples and are not limiting, and other effects may also be obtained.

[0332] Note that the present technology can also be configured as follows. (1) A transmitting device including a control unit that transmits, to a receiving device, first feedback information for a data signal and a first control signal including first transmission information related to a Physical Downlink Shared Channel (PDSCH) that transmits the data signal, transmits the data signal using the PDSCH together with another transmitting device, and receives the feedback signal for the data signal from the receiving device, wherein the other transmitting device transmits, to the receiving device, second feedback information for the data signal and a second control signal including second transmission information related to the PDSCH that transmits the data signal. (2) The transmitting device according to (1), wherein the first feedback information and the second feedback information include the same information related to error correction processing. (3) The transmitting device according to (1) or (2), wherein the first feedback information and the second feedback information include the same process information that manages a feedback process. (4) The transmitting device according to (3), wherein the process information managing the feedback process is a Hybrid Automatic Repeat reQuest (HARQ) process identifier. (5) The transmitting device according to (3) or (4), wherein the first feedback information and the second feedback information include the same bit information indicating coded bits to be transmitted as the data signal corresponding to the process information. (6) The transmitting device according to (5), wherein the bit information is a redundancy version. (7) The transmitting device according to (3) or (4), wherein first bit information included in the first feedback information and indicating coded bits to be transmitted as the data signal corresponding to the process information is different from second bit information included in the first feedback information and indicating the coded bits to be transmitted as the data signal corresponding to the process information. (8) The transmitting device according to (7), wherein the first bit information and the second bit information are a redundancy version.(9) The transmitting device according to (1), wherein the first feedback information and the second feedback information include different information related to error correction processing. (10) The transmitting device according to (1) or (2), wherein the first feedback information and the second feedback information are process information for managing a feedback process, and each of the process information includes different process information. (11) The transmitting device according to (10), wherein the process information for managing the feedback process is a HARQ process identifier. (12) The transmitting device according to (10) or (11), wherein the first feedback information and the second feedback information include the same bit information indicating coded bits to be transmitted as the data signal corresponding to the process information. (13) The transmitting device according to (12), wherein the bit information is a redundancy version. (14) The transmitting device according to (10) or (11), wherein first bit information included in the first feedback information and indicating coded bits to be transmitted as the data signal corresponding to the process information is different from second bit information included in the first feedback information and indicating the coded bits to be transmitted as the data signal corresponding to the process information. (15) The transmitting device according to (14), wherein the first bit information and the second bit information are redundancy versions. (16) The transmitting device according to any one of (1) to (15), wherein the control unit receives from the receiving device the feedback signal different from that of the other transmitting devices. (17) The transmitting device according to (16), wherein the control unit receives from the receiving device the feedback signal including a response signal indicating whether the data signal was correctly received, the response signal being different from that of the other transmitting devices. (18) The transmitting device according to (16), wherein the control unit receives the feedback signal including a response signal indicating whether the data signal has been correctly received from the receiving device, and the other transmitting device receives the feedback signal not including the response signal from the receiving device.(19) The transmitting device according to any one of (1) to (15), wherein the control unit receives the same feedback signal from the receiving device as that from the other transmitting device. (20) The transmitting device according to any one of (1) to (15), wherein the other transmitting device does not receive the feedback signal from the receiving device. (21) A receiving device comprising a control unit that receives, from a first transmitting device, a first control signal including first feedback information for a data signal and first transmission information for a PDSCH that transmits the data signal, receives, from a second transmitting device, a second control signal including second feedback information for the data signal and second transmission information for the PDSCH that transmits the data signal, receives the data signal from the first transmitting device and the second transmitting device using the same PDSCH, and transmits a feedback signal for the data signal. (22) A communication method comprising: transmitting, to a receiving device, a first control signal including first feedback information for a data signal and first transmission information for a PDSCH that transmits the data signal; transmitting the data signal using the PDSCH together with another transmitting device; and receiving, from the receiving device, a feedback signal for the data signal; wherein the other transmitting device transmits, to the receiving device, a second control signal including second feedback information for the data signal and second transmission information for the PDSCH that transmits the data signal. (23) A communication method including: receiving, from a first transmitting device, a first control signal including first feedback information for a data signal and first transmission information for a PDSCH that transmits the data signal; receiving, from a second transmitting device, a second control signal including second feedback information for the data signal and second transmission information for the PDSCH that transmits the data signal; receiving the data signal from the first transmitting device and the second transmitting device using the same PDSCH; and transmitting a feedback signal for the data signal.(24) A communication system comprising: a first transmitting device, a second transmitting device, and a receiving device; wherein the first transmitting device transmits, to the receiving device, a first control signal including first feedback information for a data signal and first transmission information for a PDSCH that transmits the data signal; the second transmitting device transmits, to the receiving device, a second control signal including second feedback information for the data signal and second transmission information for the PDSCH that transmits the data signal; and the receiving device receives the data signal from the first transmitting device and the second transmitting device using the same PDSCH, and transmits a feedback signal for the data signal.

[0333] 20 Base station 21, 41 Signal processing unit 22, 42 Storage unit 23 Network communication unit 24, 44 Control unit 40 Terminal device 211, 411 Reception processing unit 212, 412 Transmission processing unit 213, 413 Antenna

Claims

transmitting, to a receiving device, a first control signal including first feedback information for a data signal and first transmission information regarding a Physical Downlink Shared Channel (PDSCH) that transmits the data signal; Transmitting the data signal using the PDSCH together with other transmitting devices; a control unit that receives a feedback signal for the data signal from the receiving device; Equipped with The other transmitting device transmits, to the receiving device, a second control signal including second feedback information for the data signal and second transmission information regarding the PDSCH through which the data signal is transmitted. Transmitting device. 　 The transmitting device according to claim 1 , wherein the first feedback information and the second feedback information include the same information regarding an error correction process. 　 The transmitting device according to claim 1 , wherein the first feedback information and the second feedback information include identical process information that manages a feedback process. 　 The transmitting device according to claim 3 , wherein the process information for managing the process of the feedback is a Hybrid Automatic Repeat reQuest (HARQ) process identifier. 　 The transmitting device according to claim 3 , wherein the first feedback information and the second feedback information include the same bit information indicating coded bits to be transmitted as the data signal corresponding to the process information. 　 The transmitting device according to claim 5 , wherein the bit information is a redundancy version.

4. The transmitting device according to claim 3, wherein first bit information included in the first feedback information and indicating coded bits to be transmitted as the data signal corresponding to the process information is different from second bit information included in the first feedback information and indicating the coded bits to be transmitted as the data signal corresponding to the process information. 　 The transmitting device according to claim 1 , wherein the first feedback information and the second feedback information include different information related to an error correction process. 　 The transmitting device according to claim 1 , wherein the first feedback information and the second feedback information are process information for managing a feedback process, and each of the first feedback information and the second feedback information includes different process information. 　 The transmitting device of claim 9 , wherein the process information for managing the process of feedback is a HARQ process identifier. 　 The transmitting device according to claim 9 , wherein the first feedback information and the second feedback information include the same bit information indicating coded bits to be transmitted as the data signal corresponding to the process information.

10. The transmitting device according to claim 9, wherein first bit information included in the first feedback information and indicating coded bits to be transmitted as the data signal corresponding to the process information is different from second bit information included in the first feedback information and indicating the coded bits to be transmitted as the data signal corresponding to the process information. 　 The transmitting device according to claim 1 , wherein the control unit receives the feedback signal from the receiving device that is different from that received from the other transmitting device. 　 The transmitting device according to claim 13, wherein the control unit receives from the receiving device the feedback signal including a response signal indicating whether the data signal has been correctly received, the response signal being different from that of the other transmitting devices. 　 the control unit receives the feedback signal from the receiving device, the feedback signal including a response signal indicating whether the data signal has been correctly received; the other transmitting device receives the feedback signal from the receiving device, the feedback signal not including the response signal; The transmitting device according to claim 13. 　 The transmitting device according to claim 1 , wherein the control unit receives the same feedback signal from the receiving device as that received from the other transmitting device. 　 The transmitting device according to claim 1 , wherein the other transmitting device does not receive the feedback signal from the receiving device. 　 receiving, from a first transmitting device, a first control signal including first feedback information for a data signal and first transmission information regarding a PDSCH that transmits the data signal; receiving, from a second transmitting device, second feedback information for the data signal and a second control signal including second transmission information for the PDSCH through which the data signal is transmitted; receiving the data signals from the first transmitting device and the second transmitting device using the same PDSCH; a control unit that transmits a feedback signal in response to the data signal; A receiving device comprising: 　 Transmitting a first control signal to a receiving device, the first control signal including first feedback information for a data signal and first transmission information for a PDSCH that transmits the data signal; Transmitting the data signal using the PDSCH together with another transmitting device; receiving a feedback signal for the data signal from the receiving device; Including, The other transmitting device transmits, to the receiving device, a second control signal including second feedback information for the data signal and second transmission information regarding the PDSCH through which the data signal is transmitted. Communication method. 　 receiving, from a first transmitting device, a first control signal including first feedback information for a data signal and first transmission information regarding a PDSCH that transmits the data signal; receiving, from a second transmitting device, second feedback information for the data signal and a second control signal including second transmission information for the PDSCH through which the data signal is transmitted; receiving the data signals from the first transmitting device and the second transmitting device using the same PDSCH; transmitting a feedback signal in response to the data signal; A communication method including:

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