Terminal, base station, and wireless communication system

Abstract

The terminal has a reception unit and a control unit. In the present invention, a reception unit receives, from a base station, a first signal that includes first information indicating that a DTX (Discontinuous Transmission) of a cell having an active interval and an inactive interval is enabled, and the reception unit receives, from the base station, a second signal that includes second information indicating that the DTX of the cell having the active interval and the inactive interval is enabled. The control unit controls whether or not to generate feedback information for a preset resource in accordance with whether or not the cell DTX inactive interval and the preset resource for receiving a signal from the base station overlap.

Description

TECHNICAL FIELD

[0001] The present application relates to a terminal, a base station, and a wireless communication system. BACKGROUND

[0002] In the 3GPP (3rd Generation Partnership project (registered trademark)) as a standardization project, as the NR (New Radio (also referred to as "5G")) of the fifth generation mobile communication, technical specifications of communication standards that satisfy the requirement conditions of eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications) are formulated (Non-Patent Literature 1 to Non-Patent Literature 13).

[0003] In the 3GPP, in order to realize efficient data transmission, a technology of hybrid automatic repeat request (HARQ) is adopted. In the HARQ, a receiving device, for example, requests a transmitting device side for retransmission of data that has failed to be correctly decoded in a processing at a layer 1 protocol layer. When the retransmission of the data is requested, the transmitting device side transmits retransmission data corresponding to the retransmission request of the original data that has failed to be correctly decoded at the receiving device side. At the receiving device side, the data that has failed to be correctly decoded and the retransmission data are combined, and the decoding of the data is performed. Thereby, efficient and high-precision retransmission control is realized. In addition, in the hybrid automatic repeat request, in a case where the receiving device correctly decodes the data, ACK (acknowledgement) information is transmitted, and in a case where the receiving device does not correctly decode the data, NACK (negative-acknowledgement) information is transmitted.

[0004] Further, in the 3GPP, in order to reduce the power consumption of the network side (that is, a base station device, a core network device), a technology of NES (Network Energy Savings) is being studied (Non-Patent Literature 14).

[0005] As one of the technologies in the NES, Cell DTX / DRX for implementing discontinuous reception (DRX) and / or discontinuous transmission (DTX) on a cell-by-cell basis is being studied. Cell DTX / DRX is a technology in which a base station device sets an active period and an inactive period (or non-active period) on a cell-by-cell basis, and the base station device performs normal transmission and reception only during the active period and restricts transmission and reception during the inactive period, thereby achieving reduction in power consumption (Non-Patent Literatures 14 to 16).

[0006] In addition, with regard to the Cell DTX / DRX, it is agreed that a signal of the RRC (Radio Resource Control) layer or a PDCCH (Physical Downlink Control Channel) as a downlink control channel is used to activate (Non-Patent Literatures 15 and 16).

[0007] Prior Art Documents

[0008] Non-Patent Literature

[0009] Non-Patent Literature 1: 3GPP TS 38.133 V17.10.0

[0010] Non-Patent Literature 2: 3GPP TS 38.201 V17.0.0

[0011] Non-Patent Literature 3: 3GPP TS 38.202 V17.3.0

[0012] Non-Patent Literature 4: 3GPP TS 38.211 V17.5.0

[0013] Non-Patent Literature 5: 3GPP TS 38.212 V17.5.0

[0014] Non-Patent Literature 6: 3GPP TS 38.213 V17.6.0

[0015] Non-Patent Literature 7: 3GPP TS 38.214 V17.6.0

[0016] Non-Patent Literature 8: 3GPP TS 38.215 V17.5.0

[0017] Non-Patent Literature 9: 3GPP TS 38.300 V17.5.0

[0018] Non-patent document 10: 3GPP TS 38.321 V17.5.0

[0019] Non-patent document 11: 3GPP TS 38.322 V17.5.0

[0020] Non-patent document 12: 3GPP TS 38.323 V17.5.0

[0021] Non-patent document 13: 3GPP TS 38.331 V17.5.0

[0022] Non-patent document 14: 3GPP TR 38.864 V18.1.0

[0023] Non-Patent Document 15: R2-2306553

[0024] Non-Patent Document 16: R1-2306262 Summary of the Invention

[0025] The problem that the invention aims to solve

[0026] There is SPS (semi-persistent scheduling), which is a method in which resources for receiving signals are pre-set from the base station, and the terminal uses the set resources to receive signals.

[0027] However, considering the simultaneous processing of cell DTX / DRX and communication using pre-defined resources, such as SPS, the details of handling such situations have not yet been determined. Therefore, there is a possibility that cell DTX / DRX processing may be inefficient within the overall wireless communication system.

[0028] Therefore, the processing related to cell DTX / DRX needs to take into account situations where cell DTX / DRX processing is performed simultaneously, as well as communications using pre-defined resources such as SPS. Furthermore, the processing related to cell DTX / DRX includes signal processing for the transmission and reception of HARQ feedback information within the cell DTX / DRX interval.

[0029] The disclosed technology was developed in view of the above, and its purpose is to provide a method for efficiently performing processing related to cell DTX / DRX.

[0030] Methods for solving problems

[0031] In one aspect, a terminal is provided, having: a reception section that receives, from a base station, a first signal including first information indicating that cell DTX (Discontinuous Transmission) is effective; and a control section that controls whether or not generation of feedback information for a resource is performed, in accordance with whether or not a non-active interval of the cell DTX and a resource set in advance for reception of a signal from the base station overlap.

[0032] Effects of Invention

[0033] A terminal, a base station, and a wireless communication system, etc. that can efficiently perform processing related to cell DTX / DRX can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a diagram showing an example of a wireless communication system in Embodiment 1.

[0035] Figure 2 is a diagram showing an example of a functional configuration of a base station.

[0036] Figure 3 is a diagram showing an example of a functional configuration of a terminal.

[0037] Figure 4 is a diagram showing an example of a processing timing of a wireless communication system in Embodiment 1.

[0038] Figure 5 is a diagram showing an example of processing in a terminal in Embodiment 1.

[0039] Figure 6 is a diagram showing an example of a relationship between a resource set by resource allocation information and an active period and a non-active period of cell DTX.

[0040] Figure 7 is a diagram showing an example in which processing of Embodiment 1 is reflected in a specification.

[0041] Figure 8 is a diagram showing an example of processing in a terminal in Embodiment 2.

[0042] Figure 9 is a diagram showing an example in which processing of Embodiment 2 is reflected in a specification.

[0043] Figure 10 is a diagram showing an example of a resource allocated by a base station for transmission of a signal.

[0044] Figure 11 is a diagram showing an example in which processing of Embodiment 3 is reflected in a specification.

[0045] Figure 12is a drawing showing an example of a process reflecting Embodiment 3 in a specification.

[0046] Figure 13 is an example of a hardware structure of a base station in a wireless communication system.

[0047] Figure 14 is an example of a hardware structure of a terminal in a wireless communication system. DETAILED DESCRIPTION

[0048] Hereinafter, the present embodiment will be described in detail with reference to the drawings. The problems and the embodiments in the present specification are examples, and do not limit the scope of the present application. In particular, even if the described expressions are different, as long as they are technically equivalent, the technology of the present application can be applied even to different expressions, and the scope of the right is not limited. Also, each embodiment can be appropriately combined within a range that does not contradict the processing content.

[0049] In addition, the terms and technical contents described in the present specification can be appropriately used as terms and technical contents described in the specifications, applications of standards related to communication such as 3GPP. As such specifications, for example, the specifications described in Non-Patent Literatures 1 to 14.

[0050] Hereinafter, the embodiments of the base station, the terminal, and the wireless communication system disclosed in the present application will be described in detail based on the drawings. Furthermore, the following embodiments do not limit the disclosed technology.

[0051] [Problems]

[0052] First, before explaining each embodiment, the problems in the related art will be explained. This problem is a new finding as a result of the inventors' careful study of the related art, and please note that it is a problem unknown in the past.

[0053] In a PDSCH (Physical Downlink Shared CHannel) using SPS (semi-persistent scheduling) (hereinafter, sometimes referred to as SPS-PDSCH), in a case where the terminal cannot receive the SPS-PDSCH from the base station using the resource set in advance for transmitting the PDSCH, the terminal generates NACK as HARQ feedback information. Then, the terminal transmits the generated NACK to the base station as HARQ feedback information.

[0054] Furthermore, during the inactive period of cell DTX, the base station does not transmit signals in the cell during the inactive period. Therefore, for example, if the inactive period of cell DTX overlaps with resources pre-set for transmitting SPS-PDSCH, the base station does not use the resources pre-set for transmitting SPS-PDSCH to transmit signals (SPS-PDSCH).

[0055] On the other hand, since the base station did not send the SPS-PDSCH, the terminal could not use the resources pre-set for sending the SPS-PDSCH to receive it from the base station. Therefore, the terminal generated a NACK and sent the generated NACK as HARQ feedback information.

[0056] Here, during the inactive period of cell DTX, although the base station and the terminal may mutually recognize that the base station is not sending SPS-PDSCH, they still send the generated NACK as HARQ feedback information. Therefore, there is a possibility of reduced resource utilization efficiency. In addition, the generation and transmission processing of HARQ feedback information on the terminal side and the processing of receiving HARQ feedback information on the base station side also affect the power consumption of both the terminal and the base station.

[0057] Furthermore, the example of sending downlink signals from the base station to the terminal and sending HARQ feedback information for downlink signals from the terminal to the base station has been used for illustration. However, the same situation may also occur when sending uplink signals from the terminal to the base station and sending HARQ feedback information for uplink signals from the base station to the terminal.

[0058] In summary, for example, when the inactivity period of cell DTX / DRX overlaps with resources pre-set for signal transmission, unnecessary power consumption may occur. Therefore, processing related to cell DTX / DRX that considers the relationship between the inactivity period of cell DTX / DRX and the resources pre-set for signal transmission is needed. As described above, this problem was newly discovered as a result of the inventor's careful study of the prior art and was previously unknown. Hereinafter, various embodiments of this application for solving this problem will be described sequentially.

[0059] [Implementation Method 1]

[0060] Figure 1 This diagram illustrates an example of a wireless communication system 1 in Embodiment 1. The wireless communication system 1 includes a base station 100, a terminal 200A, and a terminal 200B. The base station 100 forms a cell C10. Terminals 200A and 200B are referred to simply as terminal 200 without distinction. Terminal 200 exists within cell C10.

[0061] In addition, base station 100 can be any type of wireless base station, including macro wireless base stations, pico wireless base stations, and other small wireless base stations (such as micro wireless base stations and femto wireless base stations). It can also be referred to as a wireless communication device, communication device, or transmitting device. Similarly, terminal 200 can be any wireless terminal, such as a mobile phone, smartphone, PDA (Personal Digital Assistant), personal computer, vehicle, aircraft, drone, or other devices with wireless communication capabilities, as well as robots, AV equipment, home appliances, office equipment, vending machines, other household equipment, and industrial equipment. It can also be referred to as a wireless communication device, communication device, receiving device, or mobile station.

[0062] Base station 100 is connected to a network device (host device or other base station, not shown) via a wired connection. Alternatively, base station 100 can be connected to the network device wirelessly without a wired connection.

[0063] Base station 100 can also be separated from terminal 200 into different devices, with its wireless communication function and digital signal processing and control functions handled separately. In this case, the device with wireless communication function can be called RRH (Remote Radio Head), and the device with digital signal processing and control functions can be called BBU (Baseband Unit). Furthermore, the RRH can be located outside the BBU, and they can be connected via a wired connection such as optical fiber. Alternatively, they can be connected wirelessly. Alternatively, instead of the aforementioned RRH and BBU, they can be separated into, for example, CU (Central Unit), DU (Distributed Unit), and RU (Radio Unit). DU, for example, includes the functions of the MAC (Media Access Control) layer. Additionally, DU may also include the functions of the RLC (Radio Link Control) layer. Furthermore, RU includes at least RF (Radio Frequency) wireless circuitry. Alternatively, DU and RU can be integrated into a single structure.

[0064] On the other hand, terminal 200 communicates with base station 100 via wireless communication.

[0065] In addition, if no RRC (Radio Resource Control) connection is established between the base station 100 and the terminal 200, the base station 100 performs the processing for establishing an RRC connection.

[0066] Next, let's explain base station 100. Figure 2 This is an example of a functional structure diagram of base station 100. Base station 100 includes a wireless communication unit 110, a control unit 120, a storage unit 130, and a communication unit 140.

[0067] The wireless communication unit 110 consists of a transmitting unit 111 and a receiving unit 112, and performs wireless communication with the terminal 200. Specifically, the transmitting unit 111 transmits downlink signals to the terminal 200, such as signals from the random access procedure, signals from the RRC layer, downlink data signals, and downlink control signals.

[0068] In addition, the receiving unit 112 can receive uplink signals sent from the terminal 200, such as signals from the random access procedure, signals from the RRC layer, uplink data signals, uplink control signals, etc.

[0069] The control unit 120 controls the base station 100. Specifically, the control unit 120 is capable of establishing an RRC connection with the terminal 200, processing signals received by the receiving unit 112, generating transmission blocks (TBs), and mapping transmission blocks to radio resources.

[0070] Storage unit 130, for example, can store downlink data signals.

[0071] The communication unit 140 is connected to a network device (e.g., a host device, other base station device) via wired or wireless means to communicate. Data signals received by the communication unit 140 and directed to the terminal 200 can be stored in the storage unit 130.

[0072] Next, terminal 200 will be described. Figure 3 This is an example diagram illustrating the functional structure of terminal 200. For example... Figure 3 As shown, the terminal 200 includes a communication unit 210, a control unit 220, and a storage unit 230. These components are connected in a manner that allows for unidirectional or bidirectional input and output of signals and data. Furthermore, the communication unit 210 can be separately described as a transmitting unit 211 and a receiving unit 212.

[0073] The transmitting unit 211 transmits data signals and control signals wirelessly via an antenna. Alternatively, the antenna can be shared for both transmission and reception. The transmitting unit 211 transmits uplink signals, such as signals from the random access procedure, signals from the RRC layer, uplink data signals, and uplink control signals.

[0074] The receiving unit 212 receives downlink signals transmitted from the base station 100, such as signals from a random access procedure, downlink data signals, and downlink control signals. Furthermore, the received signals may also include reference signals used for channel estimation and demodulation.

[0075] The control unit 220 controls the terminal 200. Specifically, the control unit 220 is capable of establishing an RRC connection with the base station 100, processing signals received by the receiving unit 212, generating transmit blocks (TBs), and mapping transmit blocks to radio resources.

[0076] Storage unit 230 can store, for example, uplink data signals. Furthermore, storage unit 230 can store configuration information (or setting information) related to wireless communication transmitted from base station 100.

[0077] Next, use Figure 4 This describes the processing of the base station 100 and terminal 200 in the wireless communication system 1 of Implementation Method 1. Figure 4 This is a diagram illustrating an example of the processing timing of the wireless communication system 1 in Embodiment 1. Additionally, in Figure 4 The text explains that terminal 200A is a terminal with pre-configured resources for downlink signals, while terminal 200B is a terminal without pre-configured resources for downlink signals. Additionally, in... Figure 4 In this context, it is assumed that the cell DTX settings are preset. Additionally, the cell DTX settings are, for example, set in... Figure 4 The recorded timing sequence is previously set in the terminal 200 using signals from the RRC layer. Additionally, the cell DTX setting is set, for example, using signals such as MIB (Master Information Block) or SIB1 (System Information Block 1) that transmit the same information within the same cell C10.

[0078] The transmitting unit 111 of base station 100 sends a signal containing resource allocation information to terminal 200A (step S10). Furthermore, the signal containing resource allocation information is, for example, a second signal. Moreover, the second signal is, for example, a signal from the RRC layer. Resource allocation information is an example of second information.

[0079] When the receiving unit 212 of terminal 200A receives a signal containing resource allocation information from base station 100 (step S10), it sets the configuration corresponding to the resource allocation information. Then, after completing the configuration setting of base station 100 corresponding to the resource allocation information, the transmitting unit 211 of terminal 200A transmits a response signal to the signal containing the resource allocation information. The configuration corresponding to the resource allocation information will be described later.

[0080] The transmitting unit 111 of base station 100 transmits a signal containing information for activating resources set through resource allocation information (step S30). The signal containing information for activating resources set through resource allocation information is an example of a third signal. Furthermore, the third signal is, for example, a PDCCH (Physical Downlink Control Channel). Additionally, the information for activating resources set through resource allocation information is an example of third information. When the signal containing information for activating resources set through resource allocation information is received, the control unit 220 of terminal 200A controls the receiving unit 220 to receive downlink signals through the resources corresponding to the resource allocation information.

[0081] Next, the transmitting unit 111 of base station 100 transmits a signal containing information indicating the activation of cell DTX to terminals 200A and 200B within cell C10 (step S40). The signal containing information indicating the activation of cell DTX is, for example, a first signal. This first signal may be, for example, a physical layer signal (e.g., PDCCH) or an RRC layer signal that can be transmitted to multiple terminals 200. The information indicating the activation of cell DTX is, for example, first information. Then, when cell DTX is activated, base station 100 performs a first process corresponding to cell DTX within cell C10 (step S50). This first process may involve transmitting a signal to terminals 200 within cell C10 during the active period and not transmitting a signal to terminals 200 within cell C10 during the inactive or non-active period.

[0082] Furthermore, when cell DTX is activated, terminal 200B performs the third process corresponding to cell DTX (step S70). Specifically, for example, during the activation period of cell DTX, terminal 200B performs control to monitor the signal via cell C10, and during the inactive period, it performs control not to monitor the signal via cell C10.

[0083] Furthermore, when a cell DTX is activated, the terminal 200A performs the second process corresponding to the cell DTX (step S60). In addition, specifically, besides the third process, the following process is also performed: Based on whether the resources set during the inactive period overlap with those set through the activated resource allocation information, control is exercised to determine whether feedback information for the overlapping resources is generated. Specifically, for example, if the resources set during the inactive period overlap with those set through the activated resource allocation information, the terminal 200A does not generate feedback information for the overlapping resources.

[0084] Here, using Figure 5 and Figure 6 An example illustrating the difference between the second and third processes will be provided. Figure 5 This is a diagram illustrating an example of the action flow in terminal 200A. Furthermore, Figure 6 This is a diagram illustrating an example of the relationship between the activation and inactivation periods of resources and cell DTX as set by resource allocation information.

[0085] The control unit 220 of terminal 200A enables cell DTX for cell C10 (step S61). The control unit 220 of terminal 200A determines whether the current interval is an inactive interval (step S62).

[0086] For example, such as Figure 6 As shown, within time intervals A1 to A10, the active intervals for cell DTX are defined as time intervals A1 to A4, and the inactive intervals for cell DTX are defined as time intervals A5 to A10. Furthermore, time intervals A1 to A10 are an example of a configuration corresponding to resource allocation information, where time intervals A3, A6, and A9 represent resources pre-allocated for signal transmission. Additionally, a time interval can be any unit on the time axis, such as a time slot, subframe, or frame. Then, in step S62, for example, in the case of time intervals A1 to A4, the current interval is determined to be an active interval, and in the case of time intervals A5 to A10, the current interval is determined to be an inactive interval. The signal transmitted using the pre-allocated resources is, for example, SPS-PDSCH.

[0087] When the time interval is an active interval (step S62: No), the control unit 220 of the terminal 200A performs signal reception processing using the set resources. For example, in Figure 6 During time interval A3, control is performed to enable the receiving unit 212 to receive signals from the base station 100.

[0088] Then, the control unit 220 of the terminal 200A generates HARQ feedback information based on the result of the reception processing and sends the generated HARQ feedback information (step S64). For example, if the data decoding is successful, the control unit 220 of the terminal 200A generates ACK as HARQ feedback information; if the data cannot be received or the data decoding fails, it generates NACK as HARQ feedback information. Furthermore, HARQ feedback information is an example of feedback information.

[0089] When the time interval is an inactive interval (step S62: Yes), the control unit 220 of the terminal 200A performs control to prevent the use of the set resources for signal reception processing. For example, in Figure 6During time intervals A6 and A9, control is performed to prevent the receiving unit 212 from receiving signals from the base station 100. Furthermore, since no reception processing is performed in step S65, the control is to prevent the generation of HARQ feedback information accompanying reception processing.

[0090] As described above, in Implementation 1, when the set resource overlaps with the inactive range of cell DTX, the terminal 200 does not generate HARQ feedback information for that resource. Therefore, since the generation and transmission of HARQ feedback information in the terminal 200 are not performed, power consumption in the terminal 200 can be reduced, for example. Furthermore, when the set resource overlaps with the inactive range of cell DTX, the base station 100 does not receive HARQ feedback information for that resource. Therefore, since the processing accompanying the reception of HARQ feedback information in the base station 100 is not performed, power consumption in the base station 100 can be reduced, for example. In other words, processing related to cell DTX / DRX can be performed efficiently.

[0091] Furthermore, implementation method 1 can, for example, be achieved by means of... Figure 7 That is reflected in the specifications as described above. Additionally, Figure 7 Figure (A) is a diagram illustrating an example of the processing described in Embodiment 1 as shown in the specification (TS 38.213). For example, Figure 7 (A) is the first example of the processing of Implementation 1 reflected in the specification (TS38.213). Figure 7 (B) is a second example reflecting the processing of Implementation 1 in the specification (TS38.213). The difference between the first and second examples lies in the presence or absence of equivalents. Figure 4 The third signal is related to the PDCCH record.

[0092] [Implementation Method 2]

[0093] In Embodiment 1, an example was described where the terminal 100 controls the generation of HARQ feedback information when the inactive region of cell DTX (Discretionary Transaction Optimization) overlaps with a set resource. In Embodiment 2, control is described to determine whether to generate HARQ feedback information based on the third signal described in Embodiment 1. Furthermore, in Embodiment 2, the wireless communication system, base station, and terminal are the same as in Embodiment 1, therefore, their descriptions are omitted.

[0094] use Figure 8 This is a diagram illustrating an example of the operation flow in terminal 200A in Embodiment 2. Figure 8 This diagram illustrates an example of processing in the terminal in Implementation Method 2. Furthermore, Figure 8 yes Figure 4 The second process shown includes the processing for the same purpose as... Figure 5Repeated parts are omitted from the description.

[0095] If the time interval is an inactive interval (step S62: Yes), the control unit 220 of the terminal 200A determines whether the signal received in step S40 is a specific type of signal (step S66). Furthermore, a specific type of signal may be, for example, a signal from the RRC layer. Additionally, a signal different from a specific type of signal may be, for example, a PDCCH.

[0096] If the signal is a specific type of signal (step S66: Yes), proceed to step S65. If the signal is not a specific type of signal (step S66: No), proceed to steps S63 and S64. Note that when step S63 is performed via step S66, for example, if no signal is received in time interval A6, a NACK is generated as HARQ feedback information in step S64.

[0097] As described above, in Implementation 2, when the set resource overlaps with the inactive interval of cell DTX, the terminal 200 controls whether to generate and transmit HARQ feedback based on the type of signal that enables cell DTX. This control prevents the generation and transmission of HARQ feedback for specific types of signals. Conversely, for signals other than specific types, conventional control is possible. For example, when the signal enabling cell DTX is an RRC layer signal, the generation and transmission of HARQ feedback are prevented. Therefore, the processing of receiving HARQ feedback information accompanying the base station 100 can be prevented, thereby reducing power consumption in the terminal 200 and base station 100. In other words, efficient processing related to cell DTX / DRX is possible. For example, when the signal enabling cell DTX is a physical layer signal (such as PDCCH), considering the possibility that the terminal may fail to receive the physical layer signal that enables or disables cell DTX, the generation and transmission of HARQ feedback are controlled. Therefore, it can avoid the inability to respond to the transmission and HARQ feedback information from the base station when the terminal fails to receive the physical layer signal that disables the cell DTX.

[0098] In addition, implementation method 2 can be achieved, for example, by means of... Figure 9 That is reflected in the specifications as described above. Additionally, Figure 9 This is a diagram illustrating an example of the processing described in Embodiment 2 in the specification (TS38.213).

[0099] [Implementation Method 3]

[0100] In Embodiment 1, an example was described where the terminal 100 controls the generation of HARQ feedback information when the inactive region of cell DTX (Discretionary Transaction Module) overlaps with a set resource. In Embodiment 2, control was described to determine whether to generate HARQ feedback information based on a third signal. In Embodiment 3, an example was described using a HARQ-ACK codebook as HARQ feedback information. Furthermore, the wireless communication system, base station, and terminal are the same as in Embodiment 1, and therefore descriptions are omitted.

[0101] The HARQ-ACK codebook is explained below. The HARQ-ACK codebook is a method of multiplexing ACK / NACK information from multiple time slots and multiple carriers into a single signal (e.g., within PUCCH or PUSCH) and transmitting it as HARQ feedback information. Furthermore, there are, for example, three types of HARQ-ACK codebooks.

[0102] The first type of HARQ-ACK codebook is a semi-static method. This, for example, generates HARQ ACK / NACK for the downlink signal reception position set based on the RRC signal.

[0103] The second type of HARQ-ACK codebook is a dynamic method. This involves generating HARQ ACK / NACK codes only for downlink signals that are actually scheduled and transmitted from the base station via downlink control information.

[0104] The third type of HARQ-ACK codebook is a one-shot method. This involves triggering HARQ responses for all configured cells (or serving cells) or a subset of configured cells (or serving cells) and / or HARQ processes via downlink control information.

[0105] <HARQ feedback using the first type of HARQ-ACK codebook>

[0106] use Figure 10 This describes the HARQ feedback performed by the terminal 200 in Implementation 3, which uses the first type of HARQ-ACK codebook. Figure 10 This is a diagram illustrating an example of resources allocated for a base station to transmit signals.

[0107] like Figure 10As described above, assume that base station 100 configures cells A, B, and C for terminal 200. Cell B is, for example, cell C10. Here, it is assumed that SPS-PDSCH resources are configured for cell B. Furthermore, cell DTX of cell B is enabled. Cell A forms time intervals B1-B6 within interval n-n+5, and time interval B3 represents the location of resources pre-configured for transmitting downlink signals. Time interval B6 represents the time interval for the terminal to transmit HARQ feedback. Cell B forms time intervals C1-C6 within interval n-n+5, and time interval C2 represents the location of resources pre-configured for transmitting downlink signals. Cell C forms time intervals D1-D6 within interval n-n+5, and time interval D4 represents the location of resources pre-configured for transmitting downlink signals.

[0108] exist Figure 10 In this case, terminal 200 uses the method described in Implementation 1 for cell B, for example. That is, since time intervals C1-C6 of cell B are inactive intervals, terminal 200 does not perform the process of generating HARQ feedback in time interval C2. Therefore, in time interval B6, the HARQ feedback information sent from terminal 200 includes ACK / NACK information corresponding to the reception processing in time interval B3 and ACK / NACK information corresponding to the reception processing in time interval D4.

[0109] Alternatively, terminal 200 may generate HARQ feedback only for SPS-PDSCH. In this case, no HARQ feedback is generated for the configured SPS-PDSCH resources that overlap with the inactive interval of cell DTX. For example, terminal 200 does not perform the process of generating HARQ feedback in time interval C2. Therefore, in time interval B6, the HARQ feedback information sent from terminal 200 includes ACK / NACK information corresponding to the reception processing in time interval B3 and ACK / NACK information corresponding to the reception processing in time interval D4.

[0110] In addition, Figure 10In cell B, the method described in Implementation 2 can also be used to generate HARQ feedback. In summary, terminal 200 controls whether to generate ACK or NACK information for the resources in time interval C2 based on the type of signal containing information that enables cell DTX. For example, when the signal enabling cell DTX is an RRC layer signal, control is set to not generate and send HARQ feedback. For example, when the signal enabling cell DTX is a physical layer signal (such as PDCCH), control is set to generate and send HARQ feedback. Furthermore, when ACK or NACK information for the resources in time interval C2 is generated, terminal 200, for example, sends HARQ feedback information containing three ACK or NACK messages.

[0111] Alternatively, terminal 200 may generate HARQ feedback only for SPS-PDSCH. In this case, terminal 200 controls whether to generate ACK or NACK information for the set SPS-PDSCH resources that overlap with the inactive interval of cell DTX, depending on the type of signal containing information that enables cell DTX. For example, if the signal enabling cell DTX is an RRC layer signal, terminal 200 does not perform HARQ feedback generation for time interval C2. For example, if the signal enabling cell DTX is a physical layer signal (such as PDCCH), it controls the generation and transmission of HARQ feedback. Terminal 200 performs HARQ feedback generation for time interval C2. Therefore, in time interval B6, the HARQ feedback information transmitted from terminal 200 includes ACK / NACK information corresponding to the reception processing in time interval B3, ACK / NACK information corresponding to the reception processing in time interval C2, and ACK / NACK information corresponding to the reception processing in time interval D4.

[0112] Alternatively, terminal 200 can also generate HARQ feedback only for retransmitted signals. For example, terminal 200 in Figure 10 In this diagram, time intervals B3 and C2 are resources for transmitting retransmitted signals, and time interval D4 is a pre-defined resource for transmitting downlink signals. Furthermore, cell B is an inactive interval, but base station 100 can still transmit signals to retransmitted signals. Therefore, it can receive signals retransmitted in time interval C2.

[0113] In this case, during time interval B6, the HARQ feedback information sent from terminal 200 includes ACK or NACK information corresponding to the reception processing in time interval B3, and ACK or NACK information corresponding to the reception processing in time interval C2.

[0114] Additionally, the HARQ feedback information sent from terminal 200 may also include ACK or NACK information for signals other than retransmission signals occurring in the inactive interval of cell B. In summary, the control system generates ACK or NACK for signals received in cells A and C, while for cell B, it generates ACK or NACK based on the type of signal to be received (whether it is a retransmission signal).

[0115] Furthermore, regarding the HARQ feedback using the first type of HARQ-ACK codebook in Implementation 3, it can be achieved through, as... Figure 11 That is reflected in the specifications as described above. Additionally, Figure 11 This is a diagram illustrating an example of the processing described in Embodiment 3, as shown in the specification (TS38.213). For example, Figure 11 (A) specifies in the specification (TS38.213) that when HARQ feedback is generated only for SPS-PDSCH, HARQ feedback information (e.g., ACK or NACK) is not generated for SPS-PDSCH in the active region. Furthermore, Figure 11 (B) is an example of generating HARQ report information only for retransmitted signals when the control information indicates a retransmission, as specified in the specification (TS 38.213).

[0116] <HARQ feedback using the second type of HARQ-ACK codebook>

[0117] The HARQ feedback performed by the terminal 200 in Implementation 3, which uses the second type of HARQ-ACK codebook, will be described.

[0118] The control unit 220 of terminal 200 generates HARQ feedback information for resources in the active range of cell DTX, except for the predetermined signal (e.g., SPS-PDSCH) transmitted through the inactive range of cell DTX (in other words, outside the active range of DTX) as the object of HARQ feedback information, and summarizes and sends it.

[0119] Furthermore, as described in Embodiment 2, the control unit 220 of the terminal 200 can also determine whether to generate HARQ feedback information for resources in the inactive region of cell DTX based on the type of signal containing information that enables cell DTX. For example, when the signal enabling cell DTX is an RRC layer signal, the control prevents the generation and transmission of HARQ feedback. For example, when the signal enabling cell DTX is a physical layer signal (such as PDCCH), the control enables the generation and transmission of HARQ feedback.

[0120] Furthermore, regarding the HARQ feedback using the second type of HARQ-ACK codebook in Implementation 3, it can be achieved through, as... Figure 12 That is reflected in the specifications as described above. Additionally, Figure 12 This is a diagram illustrating an example of the processing described in Embodiment 3 in the specification (TS38.213).

[0121] <HARQ feedback using a third type of HARQ-ACK codebook>

[0122] The HARQ feedback performed by the terminal 200 in Implementation 3, which uses a third type of HARQ-ACK codebook, will be described.

[0123] The control unit 220 of terminal 200 takes a predetermined signal (e.g., PDSCH) transmitted through the inactive range of cell DTX (in other words, outside the active range of DTX) as the object of HARQ information, generates HARQ feedback information for the resources of the active range of cell DTX, and sends it in summary.

[0124] Furthermore, as described in Embodiment 2, the control unit 220 of the terminal 200 can also determine whether to generate HARQ feedback information for resources in the inactive region of cell DTX based on the type of signal containing information that enables cell DTX. For example, when the signal enabling cell DTX is an RRC layer signal, the control prevents the generation and transmission of HARQ feedback. For example, when the signal enabling cell DTX is a physical layer signal (such as PDCCH), the control enables the generation and transmission of HARQ feedback.

[0125] As described above, terminal 200 controls the generation of HARQ feedback information using the methods described in Embodiments 1 and 2. Furthermore, terminal 200 can transmit only the generated HARQ feedback information as a single feedback message. Additionally, base station 100 can receive only the generated HARQ feedback information as a single feedback message and identify the signals corresponding to each HARQ feedback message contained in the received feedback message. Therefore, base station 100 can perform retransmission control, etc., without being affected by HARQ feedback information not generated under the control of terminal 200.

[0126] As described above, in Embodiment 3, when the terminal 200 summarizes multiple HARQ feedback messages and sends a single feedback message, the method described in Embodiments 1 and 2 can also be used. Therefore, when the inactive region of cell DTX overlaps with a set resource, control is exercised on whether to generate and send HARQ feedback for that resource. By controlling this, for example, when HARQ feedback is not generated for that resource, the amount of information contained in a single feedback message can be reduced.

[0127] [Hardware structure of each device in each embodiment]

[0128] based on Figure 13 as well as Figure 14 The hardware structure of each device in the wireless communication system of each embodiment is described.

[0129] Figure 13 This is a diagram illustrating an example of the hardware structure of base station 100. (See diagram below.) Figure 13 As shown, as hardware components, base station 100 includes, for example, an RF (Radio Frequency) circuit 320 with an antenna 310, a CPU (Central Processing Unit) 330, a DSP (Digital Signal Processor) 340, a memory 350, and a network IF (Interface) 360. The CPU 330 is connected via a bus to enable input and output of various signals and data signals. The memory 350 includes, for example, at least any one of RAM (Random Access Memory) such as SDRAM (Synchronous Dynamic Random Access Memory), ROM (Read Only Memory), and flash memory, storing programs, control information, and data signals.

[0130] illustrate Figure 2 The functional structure of the base station 100 shown is similar to Figure 13The hardware structure corresponding to the base station 100 shown is as follows. The transmitting unit 111 and the receiving unit 112 (or the wireless communication unit 110) are implemented, for example, by RF circuit 320, or antenna 310 and RF circuit 320. The control unit 120 is implemented, for example, by CPU 330, DSP 340, memory 350, or digital electronic circuits not shown. Examples of digital electronic circuits include ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), and LSI (Large Scale Integration). The storage unit 130 is implemented, for example, by memory 350. The communication unit 140 is implemented, for example, by network IF 360.

[0131] In addition, the base station 100 can also generate multiple data signals that are transmitted in multiple sub-bands, but the filters that generate them can also be constructed independently for each sub-band.

[0132] Figure 14 This is a diagram illustrating an example of the hardware structure of terminal 200. (For example...) Figure 14 As shown, terminal 200 includes, for example, an RF circuit 420 with an antenna 410, a CPU 430, and a memory 440 as hardware components. Furthermore, terminal 200 may also include a display device such as an LCD (Liquid Crystal Display) connected to the CPU 430. The memory 440 includes, for example, at least any one of RAM such as SDRAM, ROM, and flash memory, storing programs, control information, and data signals.

[0133] illustrate Figure 3 The functional structure of the terminal 200 shown is similar to Figure 14 The hardware structure corresponding to the terminal 200 shown is as follows. The transmitting unit 211 and the receiving unit 212 (or the communication unit 210) are implemented, for example, by RF circuit 420, or antenna 410 and RF circuit 420. The control unit 220 is implemented, for example, by CPU 430, memory 440, or digital electronic circuits (not shown). Examples of digital electronic circuits include ASICs, FPGAs, and LSIs. Furthermore, the storage unit 230 is implemented, for example, by memory 440.

[0134] In addition, the various implementation methods can be appropriately combined within the scope of not being contradictory.

[0135] Furthermore, each embodiment describes an example of a base station and a terminal, but the disclosed technology is not limited thereto. For example, it can be applied to various devices such as electronic devices mounted on automobiles, trams, airplanes, artificial satellites, electronic devices transported by drones, robots, AV equipment, home appliances, office equipment, vending machines, and other living devices.

[0136] Furthermore, while fifth-generation mobile communication has been used as an example in the various embodiments described, the application of the disclosed technology is not limited to this. For example, the disclosed technology can also be applied to different generations of mobile communication, such as sixth-generation and seventh-generation.

[0137] Explanation of reference numerals in the attached figures

[0138] 1. Wireless Communication System

[0139] 100 base stations

[0140] C10 Community

[0141] 110 Wireless Communications Department

[0142] 111 Sending Department

[0143] 112 Receiving Section

[0144] 120 Control Department

[0145] 130 Storage Department

[0146] 140 Ministry of Communications

[0147] 200, 200A, 200B terminals

[0148] 210 Ministry of Communications

[0149] 211 Sending Department

[0150] 212 Receiving Section

[0151] 220 Control Department

[0152] 230 Storage Department

[0153] 310 antenna

[0154] 320 RF circuit

[0155] 330 CPU

[0156] 340 DSP

[0157] 350 memory

[0158] 360 Network IF

[0159] 410 antenna

[0160] 420 RF circuit

[0161] 430 CPU

[0162] 440 memory

Claims

1. A terminal, characterized in that, The terminal has: A receiving unit receives a first signal transmitted from a base station, the first signal containing first information indicating that cell DTX (Discontinuous Transmission) is enabled; and The control unit controls whether to generate feedback information for the resources based on the inactive range of the cell DTX and whether the resources preset for receiving signals from the base station are duplicated.

2. The terminal according to claim 1, wherein, The first signal is a signal sent from the base station to one or more terminals within the cell, including the terminal.

3. The terminal according to claim 1, wherein, The receiving unit receives from the base station a second signal containing second information for setting the resources. The control unit sets the resources based on the second information.

4. The terminal according to claim 1, wherein, The receiving unit receives a third signal from the base station, the third signal containing information that makes the resource valid, i.e., third information. The control unit performs control based on the third information to ensure effective reception of signals through the resource and to process the resource.

5. The terminal according to claim 1, wherein, The control unit performs control to prevent the generation of feedback information for the duplicate resource when the first signal is a specific type of signal, and performs control to generate feedback information for the duplicate resource when the first signal is a signal different from the specific type of signal.

6. The terminal according to claim 5, wherein, The specific type of signal is the signal of the RRC layer, and the signal that is different from the specific type of signal is the PDCCH.

7. The terminal according to claim 1, wherein, The terminal also has a sending unit, which generates the feedback information for resources other than the duplicated resources and sends the feedback information.

8. A base station, characterized in that, The base station has the following features: The transmitting unit sends a first signal to the terminal, the first signal containing first information, the first information indicating that cell DTX (Discontinuous Transmission) is enabled; as well as The receiving unit receives feedback information about the resources generated based on whether the inactive range of the cell DTX is repeated with the resources preset for the terminal to receive signals.

9. The base station according to claim 8, wherein, The base station also includes a control unit that performs control to prevent the reception of feedback information for the duplicate resources.

10. A wireless communication system, characterized in that, The wireless communication system has the following features: A base station transmits a first signal, the first signal containing first information, the first information indicating that cell DTX (Discontinuous Transmission) is enabled; as well as The terminal receives the first signal and controls whether to generate feedback information for the resource based on whether the inactive range of the cell DTX overlaps with the resources preset for receiving signals from the base station.

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