Terminal device, base station device, and communication method

Abstract

The present invention relates to a terminal device, a base station device, and a communication method. [Problem] To provide a terminal device capable of performing efficient communication in a communication system in which communication is performed between a base station device and a terminal device. [Solution] The terminal device for communicating with a base station device is characterized by comprising an upper layer processing unit that sets a SPDSCH setting using upper layer signaling from the base station device, and a reception unit that receives a PDSCH if the SPDSCH setting is not set, and receives a SPDSCH if the SPDSCH setting is set, wherein the SPDSCH is mapped to any one of one or more candidate SPDSCHs configured according to the SPDSCH setting, and the number of symbols of resources used in the mapping of the SPDSCH is smaller than the number of symbols of resources used in the mapping of the PDSCH.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 201680061881.5, filed on October 26, 2016, entitled "Terminal Equipment, Base Station Equipment and Communication Method". Technical Field

[0002] This disclosure relates to terminal equipment, base station equipment, and communication methods. Background Technology

[0003] The 3rd Generation Partnership Project (3GPP) is reviewing radio access methods and radio networks for cellular mobile communications (hereinafter also referred to as LTE-Advanced (LTE-A), LTE-Advanced Pro (LTE-A Pro), or Evolved Universal Terrestrial Radio Access (EUTRA)). Furthermore, in the following description, LTE includes LTE-A, LTE-A Pro, and EUTRA. In LTE, base station equipment (base station) is also referred to as an evolved Node B (eNodeB), and terminal equipment (mobile station, mobile station equipment, or terminal) is also referred to as user equipment (UE). LTE is a cellular communication system in which multiple areas covered by base station equipment are arranged in cells. A single base station equipment can manage multiple cells.

[0004] LTE is compatible with both Frequency Division Duplex (FDD) and Time Division Duplex (TDD). LTE using FDD is also known as FD-LTE or LTE FDD. TDD is a technology that enables full-duplex communication in at least two frequency bands by frequency-division multiplexing uplink and downlink signals. LTE using TDD is also known as TD-LTE or LTE TDD. TDD is a technology that enables full-duplex communication in a single frequency band by time-division multiplexing uplink and downlink signals. Details of FD-LTE and TD-LTE are disclosed in Non-Patent Document 1.

[0005] Base station equipment maps physical channels and physical signals to physical resources constructed according to a predefined frame structure and transmits the physical channels and physical signals. Terminal equipment receives the physical channels and physical signals transmitted from the base station equipment. In LTE, multiple frame structure types are defined, and data transmission is performed using the physical resources of the frame structure corresponding to each frame structure type. For example, frame structure type 1 is suitable for FD-LTE, and frame structure type 2 is suitable for TD-LTE. Details of the frame structure are disclosed in Non-Patent Document 1.

[0006] In LTE, a predetermined time interval is defined as the unit of time for data transmission. Such a time interval is called a Transmission Time Interval (TTI). For example, a TTI of 1 millisecond corresponds to one subframe length. Base station equipment and terminal equipment transmit and receive physical channels and / or physical signals according to the TTI. Details of the TTI are disclosed in Non-Patent Document 2.

[0007] Furthermore, TTI is used as a unit to specify the data transmission process. For example, during data transmission, after receiving data, a Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) report indicating whether the received data was correctly received is transmitted after a period of time specified as an integer multiple of TTI. Thus, the time necessary for data transmission (delay or waiting time) is determined by TTI. Such a data transmission process is disclosed in Non-Patent Document 3.

[0008] Citation List

[0009] Non-patent literature

[0010] Non-patent document 1: 3rd Generation Partnership Project; TechnicalSpecification Group Radio Access Network; Evolved Universal Terrestrial RadioAccess (E-UTRA); Physical Channels and Modulation (Release 12), 3GPP TS36.211 V12.7.0 (2015-09).

[0011] Non-patent document 2: 3rd Generation Partnership Project; TechnicalSpecification Group Radio Access Network; Evolved Universal Terrestrial RadioAccess (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 12), 3GPP TS 36.300 V12.7.0(2015-09).

[0012] Non-patent document 3: 3rd Generation Partnership Project; TechnicalSpecification Group Radio Access Network; Evolved Universal Terrestrial RadioAccess (E-UTRA); Physical layer procedures (Release 12), 3GPP TS 36.213V12.7.0 (2015-09). Summary of the Invention

[0013] Technical issues

[0014] In LTE, only 1 millisecond is defined as the Time Interval (TTI), and physical channels and physical signals are defined according to a 1-millisecond TTI. Furthermore, the time necessary for data transmission is an integer multiple of 1 millisecond. Therefore, in use cases where the time period necessary for data transmission is critical, the size (length) of the TTI affects performance. Moreover, when multiple physical resources are consecutively allocated to terminal devices in such use cases to shorten the time period necessary for data transmission, the overall system transmission efficiency deteriorates significantly.

[0015] In view of the above problems, this disclosure was made, with the object of providing a base station device, terminal device, communication system, communication method, and integrated circuit in which a base station device and a terminal device communicate with each other, and which can take into account the time period necessary for data transmission and improve the overall system transmission efficiency.

[0016] Solution to the problem

[0017] According to this disclosure, a terminal device for communicating with a base station device is provided, comprising: an upper-layer processing unit configured to perform SPDSCH setting via upper-layer signaling from the base station device; and a receiving unit configured to receive PDSCH without performing SPDSCH setting, and to receive SPDSCH with performing SPDSCH setting. The SPDSCH is mapped to any one of one or more candidate SPDSCHs set according to the SPDSCH setting. The number of symbols for the resources used for mapping the SPDSCH is less than the number of symbols for the resources used for mapping the PDSCH.

[0018] Furthermore, according to this disclosure, a base station device for communicating with a terminal device is provided, comprising: an upper-layer processing unit configured to perform SPDSCH setting in the terminal device via upper-layer signaling; and a transmission unit configured to transmit PDSCH without performing SPDSCH setting, and to transmit SPDSCH with performing SPDSCH setting. The SPDSCH is mapped to any one of one or more candidate SPDSCHs set according to the SPDSCH setting. The number of symbols for the resources used for mapping the SPDSCH is less than the number of symbols for the resources used for mapping the PDSCH.

[0019] Furthermore, according to this disclosure, a communication method for use in a terminal device communicating with a base station device is provided, comprising: a step of configuring an SPDSCH via signaling from an upper layer of the base station device; and a step of receiving a PDSCH without configuring the SPDSCH, and receiving an SPDSCH with configuring the SPDSCH. The SPDSCH is mapped to any one of one or more candidate SPDSCHs configured according to the SPDSCH configuration. The number of symbols in the resources used for mapping the SPDSCH is less than the number of symbols in the resources used for mapping the PDSCH.

[0020] Furthermore, according to this disclosure, a communication method is provided for use in a base station device communicating with a terminal device, comprising: a step of configuring SPDSCH in the terminal device via upper-layer signaling; and a step of transmitting PDSCH without configuring SPDSCH, and transmitting SPDSCH with configuring SPDSCH. The SPDSCH is mapped to any one of one or more candidate SPDSCHs configured according to the SPDSCH configuration. The number of symbols in the resources used for mapping SPDSCH is less than the number of symbols in the resources used for mapping PDSCH.

[0021] Beneficial effects of the invention

[0022] As described above, according to this disclosure, transmission efficiency can be improved in a wireless communication system in which base station equipment and terminal equipment communicate with each other.

[0023] Note that the effects described above are not necessarily limiting. Any effect described in this specification, or other effects that can be achieved by combining with or replacing the above effects, can be obtained. Attached Figure Description

[0024] Figure 1 This is a diagram illustrating an example of a downlink subframe in this embodiment.

[0025] Figure 2This is a diagram illustrating an example of an uplink subframe in this embodiment.

[0026] Figure 3 This is a schematic block diagram illustrating the configuration of the base station device 1 in this embodiment.

[0027] Figure 4 This is a schematic block diagram illustrating the configuration of the terminal device 2 in this embodiment.

[0028] Figure 5 This is a diagram illustrating an example of downlink resource element mapping in this embodiment.

[0029] Figure 6 This is a diagram illustrating an example of TTI in this embodiment.

[0030] Figure 7 This is a diagram illustrating an example of TTI in this embodiment.

[0031] Figure 8 This is a diagram illustrating an example of a set of candidate SPDSCHs.

[0032] Figure 9 This is a diagram illustrating examples of SPDSCH transmission in base station equipment and HARQ-ACK reporting in terminal equipment.

[0033] Figure 10 This is a diagram illustrating examples of SPDSCH transmission in base station equipment and HARQ-ACK reporting in terminal equipment.

[0034] Figure 11 This is a flowchart of the terminal device that performs STTI settings.

[0035] Figure 12 This is a diagram illustrating an example of how base station equipment and terminal equipment operate when multiple terminal devices are making settings related to the same SPDSCH.

[0036] Figure 13 This is a block diagram illustrating a first example of the schematic configuration of an eNB to which the technology of this disclosure can be applied.

[0037] Figure 14 This is a block diagram illustrating a second example of a schematic configuration of an eNB to which the technology of this disclosure can be applied.

[0038] Figure 15 is a block diagram illustrating an example of the schematic configuration of a smart phone 900 to which the technology of this disclosure can be applied.

[0039] Figure 16This is a block diagram illustrating an example of the schematic configuration of an in-vehicle navigation device 920 to which the technology of this disclosure applies. Detailed Implementation

[0040] Preferred embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Note that in the specification and drawings, functionally and structurally identical components are denoted by the same reference numerals, and repeated descriptions of these components are omitted.

[0041] <Wireless communication system in this embodiment>

[0042] In this embodiment, the wireless communication system includes at least a base station device 1 and a terminal device 2. Base station device 1 can accommodate multiple terminal devices. Base station device 1 can connect to other base station devices via an X2 interface. Furthermore, base station device 1 can connect to the evolved packet core network (EPC) via an S1 interface. Additionally, base station device 1 can connect to the Mobility Management Entity (MME) via an S1-MME interface and to the Serving Gateway (S-GW) via an S1-U interface. The S1 interface supports many-to-many connections between the MME and / or S-GW and base station device 1.

[0043] <Frame structure in this embodiment>

[0044] In this embodiment, a radio frame consisting of 10 ms (milliseconds) is defined. Each radio frame includes two half-frames. The time interval between half-frames is 5 ms. Each half-frame includes five subframes. The time interval between subframes is 1 ms, defined by two consecutive time slots. The time interval between time slots is 0.5 ms. The i-th subframe in a radio frame includes the (2×i)-th time slot and the (2×i+1)-th time slot. In other words, 10 subframes are defined in each radio frame.

[0045] Subframes include downlink subframes (first subframe), uplink subframes (second subframe), special subframes (third subframe), etc.

[0046] Downlink subframes are dedicated to downlink transmission. Uplink subframes are dedicated to uplink transmission. Special subframes consist of three fields: Downlink Pilot Time Slot (DwPTS), Guard Interval (GP), and Uplink Pilot Time Slot (UpPTS). The total length of DwPTS, GP, and UpPTS is 1 ms. DwPTS is dedicated to downlink transmission. UpPTS is dedicated to uplink transmission. GP is the field in which neither downlink nor uplink transmission occurs. Furthermore, special subframes may include only DwPTS and GP, or only GP and UpPTS. In TDD, special subframes are placed between downlink and uplink subframes and used for handover from downlink to uplink subframes.

[0047] A single radio frame includes downlink subframes, uplink subframes, and / or special subframes. Alternatively, a single radio frame may consist of only downlink subframes, uplink subframes, or special subframes.

[0048] Multiple radio frame structures are supported. The radio frame structure is specified by the frame structure type. Frame structure type 1 can only be applied to FDD. Frame structure type 2 can only be applied to TDD. Frame structure type 3 can only be applied to the operation of Licensed Assisted Access (LAA) secondary cells.

[0049] In frame structure type 2, multiple uplink-downlink configurations are specified. In an uplink-downlink configuration, each of the 10 subframes in a radio frame corresponds to one of the downlink subframe, uplink subframe, and special subframe. Subframes 0, 5, and DwPTS are reserved exclusively for downlink transmission. UpPTS and the subframe immediately following the special subframe are reserved exclusively for uplink transmission.

[0050] In frame structure type 3, 10 subframes within a radio frame are dedicated to downlink transmission. Terminal device 2 treats each subframe as an empty subframe. Unless a predetermined signal, channel, and / or downlink transmission is detected in a particular subframe, terminal device 2 assumes that no signal and / or channel exists in that subframe. Downlink transmission is dedicated to one or more consecutive subframes. The first subframe of downlink transmission can begin from any of the subframes. The last subframe of downlink transmission can be completely dedicated or dedicated by a time interval specified in the DwPTS.

[0051] Furthermore, in frame structure type 3, 10 subframes within a single radio frame can be dedicated to uplink transmission. Additionally, each of the 10 subframes within a single radio frame can correspond to any of the downlink subframe, uplink subframe, and special subframe.

[0052] Base station equipment 1 can transmit PCFICH, PHICH, PDCCH, EPDCCH, PDSCH, synchronization signals, and downlink reference signals in the DwPTS of a special subframe. Base station equipment 1 can restrict the transmission of PBCH in the DwPTS of a special subframe. Terminal equipment 2 can transmit PRACH and SRS in the UpPTS of a special subframe. In other words, terminal equipment 2 can restrict the transmission of PUCCH, PUSCH, and DMRS in the UpPTS of a special subframe.

[0053] Figure 1 This is a diagram illustrating an example of a downlink subframe in this embodiment. Figure 1 The diagram illustrated is also referred to as the downlink resource grid. Base station device 1 can transmit downlink physical channels and / or downlink physical signals in downlink subframes from base station device 1 to terminal device 2.

[0054] Downlink physical channels include the Physical Broadcast Channel (PBCH), Physical Control Format Indicator Channel (PCFICH), Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH), Physical Downlink Control Channel (PDCCH), Enhanced Physical Downlink Control Channel (EPDCCH), Physical Downlink Shared Channel (PDSCH), and Physical Multicast Channel (PMCH). Downlink physical signals include synchronization signals (SS), reference signals (RS), and discovery signals (DS). Figure 1 For simplicity, the regions of PDSCH and PDCCH are shown in the example.

[0055] Synchronization signals include the Primary Synchronization Signal (PSS) and the Secondary Synchronization Signal (SSS). Downlink reference signals include Cell-Specific Reference Signals (CRS), UE-Specific Reference Signals associated with the PDSCH (PDSCH-DMRS), Demodulation Reference Signals associated with the EPDCCH (EPDCCH-DMRS), Position Reference Signals (PRS), Channel State Information (CSI) Reference Signals (CSI-RS), and Tracking Reference Signals (TRS). PDSCH-DMRS is also known as the URS associated with the PDSCH, or simply URS. EPDCCH-DMRS is also known as the DMRS associated with the EPDCCH, or simply DMRS. PDSCH-DMRS and EPDCCH-DMRS are also simply referred to as DL-DMRS, or downlink demodulation reference signals. CSI-RS includes Non-Zero Power CSI-RS (NZP CSI-RS). Furthermore, downlink resources include Zero Power CSI-RS (ZP CSI-RS) and Channel State Information-Interference Measurement (CSI-IM).

[0056] Figure 2 This is a diagram illustrating an example of an uplink subframe in this embodiment. Figure 2 The diagram illustrated is also referred to as the uplink resource grid. Terminal device 2 can transmit uplink physical channels and / or uplink physical signals in uplink subframes from terminal device 2 to base station device 1. Uplink physical channels include the Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), Physical Random Access Channel (PRACH), etc. Uplink physical signals include reference signals (RS).

[0057] Reference signals in the uplink include the uplink demodulated signal (UL-DMRS) and the sounding reference signal (SRS). The UL-DMRS is associated with the transmission of the PUSCH or PUCCH. The SRS is not associated with the transmission of the PUSCH or PUCCH.

[0058] The downlink physical channel and downlink physical signal are collectively referred to as downlink signals. The uplink physical channel and uplink physical signal are collectively referred to as uplink signals. The downlink physical channel and uplink physical channel are collectively referred to as physical channels. The downlink physical signal and uplink physical signal are collectively referred to as physical signals.

[0059] BCH, MCH, UL-SCH, and DL-SCH are transport channels. Channels used in the Media Access Control (MAC) layer are called transport channels. The unit of a transport channel used in the MAC layer is also called a transport block (TB) or MAC Protocol Data Unit (MAC PDU). In the MAC layer, each transport block is controlled by Hybrid Automatic Repeat Request (HARQ). A transport block is the unit of data transmitted (delivered) from the MAC layer to the physical layer. In the physical layer, transport blocks are mapped to codewords, and each codeword is encoded.

[0060] <Physical resources in this embodiment>

[0061] In this embodiment, one time slot is defined by multiple symbols. The physical signals or physical channels transmitted in each time slot are represented by a resource grid. In the downlink, the resource grid is defined by multiple subcarriers in the frequency direction and multiple OFDM symbols in the time direction. In the uplink, the resource grid is defined by multiple subcarriers in the frequency direction and multiple SC-FDMA symbols in the time direction. The number of subcarriers or resource blocks can be determined by the cell bandwidth. The number of symbols in one time slot is determined by the type of cyclic prefix (CP). The type of CP is a normal CP or an extended CP. In a normal CP, the number of OFDM symbols or SC-FDMA symbols constituting one time slot is 7. In an extended CP, the number of OFDM symbols or SC-FDMA symbols constituting one time slot is 6. Each element in the resource grid is called a resource element. Resource elements are identified using the subcarrier index (number) and the symbol index (number). Furthermore, in the description of this embodiment, OFDM symbols or SC-FDMA symbols are also simply referred to as symbols.

[0062] Resource blocks are resource elements used to map to specific physical channels (PDSCH, PUSCH, etc.). Resource blocks include virtual resource blocks and physical resource blocks. Specific physical channels are mapped to virtual resource blocks. Virtual resource blocks are mapped to physical resource blocks. A physical resource block is defined in the time domain by a predetermined number of consecutive symbols. A physical resource block is defined in the frequency domain by a predetermined number of consecutive subcarriers. The number of symbols and subcarriers in a physical resource block is determined according to the type of CP in the cell, the subcarrier spacing, and / or parameters set by the upper layer. For example, in the case where the CP type is a normal CP and the subcarrier spacing is 15 kHz, the number of symbols in a physical resource block is 7, and the number of subcarriers is 12. In this case, a physical resource block includes (7 × 12) resource elements. In the frequency domain, physical resource blocks are numbered starting from 0. Furthermore, two resource blocks in a subframe corresponding to the same physical resource block number are defined as a physical resource block pair (PRB pair or RB pair).

[0063] Resource element groups (REGs) are used to define the mapping between resource elements and control channels. For example, REGs are used for mapping PDCCH, PHICH, or PCFICH. A REG consists of four consecutive resource elements used for CRS within the same OFDM symbol but not within the same resource block. Furthermore, a REG consists of the first to fourth OFDM symbols in the first slot within a specific subframe.

[0064] Enhanced Resource Element Groups (EREGs) are used to define the mapping between resource elements and enhanced control channels. For example, EREGs are used for mapping EPDCCH. One resource block pair consists of 16 EREGs. For each resource block pair, each EREG is assigned a number from 0 to 15. In one resource block pair, each EREG consists of 9 resource elements excluding the resource elements used for DM-RS associated with EPDCCH.

[0065] <Antenna port in this embodiment>

[0066] Antenna ports are defined such that the propagation channel carrying a specific symbol can be inferred from the propagation channels carrying other symbols in the same antenna port. For example, different physical resources in the same antenna port can be assumed to be transmitted through the same propagation channel. In other words, for a symbol in a specific antenna port, the propagation channel can be estimated and demodulated according to the reference signal in the antenna port. Furthermore, each antenna port has one resource grid. Antenna ports are defined by reference signals. Moreover, each reference signal can define multiple antenna ports.

[0067] Two antenna ports can be considered to be quasi-coordinated (QCL) if two of them meet predetermined conditions. The predetermined conditions are that the wide-area characteristics of the propagation channel of a transport symbol in one antenna port can be inferred from the propagation channel of the transport symbol in the other antenna port. Wide-area characteristics include delay dispersion, Doppler spread, Doppler frequency shift, average gain, and / or average delay.

[0068] <Downlink physical channel in this embodiment>

[0069] The PBCH is used to broadcast the Master Information Block (MIB), which is broadcast information specific to the serving cell of base station equipment 1. The PBCH is transmitted only in subframe 0 of a radio frame. The MIB can be updated every 40 ms. The PBCH is transmitted repeatedly every 10 ms. Specifically, the initial transmission of the MIB occurs in subframe 0 of a radio frame that satisfies the condition that the remainder obtained by dividing the System Frame Number (SFN) by 4 is 0, and the MIB is retransmitted (repeated) in subframe 0 of all other radio frames. SFN is the radio frame number (system frame number). MIB is system information. For example, the MIB includes information indicating the SFN.

[0070] PCFICH is used to transmit information related to the number of OFDM symbols used for PDCCH transmission. The area indicated by PCFICH is also called the PDCCH area. The information transmitted via PCFICH is also called Control Format Indication (CFI).

[0071] The PHICH is used to transmit HARQ-ACKs (HARQ indication, HARQ feedback, and response information) indicating whether the uplink data (Uplink Shared Channel (UL-SCH)) received by base station device 1 has received an ACK or a NACK. For example, if a HARQ-ACK indicating ACK is received, the corresponding uplink data is not retransmitted. For example, if terminal device 2 receives a HARQ-ACK indicating NACK, terminal device 2 retransmits the corresponding uplink data through a predetermined uplink subframe. A specific PHICH transmits HARQ-ACKs for a specific uplink data. Base station device 1 uses multiple PHICHs to transmit individual HARQ-ACKs for multiple uplink data contained in the same PUSCH.

[0072] PDCCH and EPDCCH are used to transmit downlink control information (DCI). The mapping of information bits in downlink control information is defined by the DCI format. Downlink control information includes downlink grant and uplink grant. Downlink grant is also known as downlink assignment or downlink allocation.

[0073] The PDCCH is transmitted using a set of one or more consecutive Control Channel Elements (CCEs). Each CCE consists of 9 Resource Groups (REGs). Each REG consists of 4 Resource Elements. When the PDCCH consists of n consecutive CCEs, it begins with the CCE that satisfies the condition that dividing the index (number) i of the CCE by n leaves a remainder of 0.

[0074] EPDCCH is transmitted using one or more consecutive sets of Enhanced Control Channel Elements (ECCEs). An ECCE consists of multiple Enhanced Resource Element Groups (EREGs).

[0075] Downlink grants are used for scheduling PDSCHs within a specific cell. Downlink grants are used for scheduling PDSCHs in the same subframe as the subframe in which the downlink grant is transmitted. Uplink grants are used for scheduling PUSCHs within a specific cell. Uplink grants are used for scheduling a single PUSCH in the fourth or subsequent subframes starting from the subframe in which the uplink grant is transmitted.

[0076] Add Cyclic Redundancy Check (CRC) parity bits to the DCI. The CRC parity bits are scrambled using a Radio Network Temporary Identifier (RNTI). An RNTI is an identifier that can be specified or set according to the purpose of the DCI. An RNTI can be an identifier pre-defined in the specification, an identifier set to information specific to the cell, an identifier set to information specific to terminal device 2, or an identifier set to information specific to the group to which terminal device 2 belongs. For example, during PDCCH or EPDCCH monitoring, terminal device 2 uses a predetermined RNTI to scramble the CRC parity bits added to the DCI and identifies whether the CRC is correct. If the CRC is correct, the DCI is considered to be the DCI of terminal device 2.

[0077] The PDSCH is used to transmit downlink data (Downlink Shared Channel (DL-SCH)). In addition, the PDSCH is also used to transmit upper-layer control information.

[0078] PMCH is used to transmit multicast data (Multicast Channel (MCH)).

[0079] In the PDCCH area, multiple PDCCHs can be multiplexed according to frequency, time, and / or space. In the EPDCCH area, multiple EPDCCHs can be multiplexed according to frequency, time, and / or space. In the PDSCH area, multiple PDSCHs can be multiplexed according to frequency, time, and / or space. PDCCH, PDSCH, and / or EPDCCH can be multiplexed according to frequency, time, and / or space.

[0080] <Downlink physical signals in this embodiment>

[0081] The synchronization signal is used by terminal device 2 to obtain downlink synchronization in the frequency domain and / or time domain. The synchronization signal includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The synchronization signal is placed in predetermined subframes within a radio frame. For example, in TDD mode, the synchronization signal is placed in subframes 0, 1, 5, and 6 of the radio frame. In FDD mode, the synchronization signal is placed in subframes 0 and 5 of the radio frame.

[0082] PSS can be used for coarse frame / timing synchronization (synchronization in the time domain) or cell group identification. SSS can be used for more precise frame timing synchronization or cell identification. In other words, PSS and SSS can be used for both frame timing synchronization and cell identification.

[0083] The downlink reference signal is provided to terminal device 2 for propagation path estimation, propagation path correction, calculation of downlink channel state information (CSI), and / or measurement of the location of terminal device 2.

[0084] CRS is transmitted across the entire frequency band of the subframe. CRS is used to receive (demodulate) PBCH, PDCCH, PHICH, PCFICH, and PDSCH. CRS is available to terminal device 2 for calculating downlink channel state information. PBCH, PDCCH, PHICH, and PCFICH are transmitted through the antenna ports used for CRS transmission. CRS supports configurations with 1, 2, or 4 antenna ports. CRS is transmitted through one or more of antenna ports 0 through 3.

[0085] The URS associated with the PDSCH is transmitted via subframes and frequency bands used for the transmission of the PDSCH associated with the URS. The URS is used for demodulation of the PDSCH associated with the URS. The URS associated with the PDSCH is transmitted via one or more of antenna ports 5 and 7-14.

[0086] PDSCH is transmitted through the antenna port used for CRS or URS transmission, depending on the transmission mode and DCI format. DCI format 1A is used for scheduling PDSCH transmitted through the antenna port used for CRS transmission. DCI format 2D is used for scheduling PDSCH transmitted through the antenna port used for URS transmission.

[0087] The DMRS associated with the EPDCCH is transmitted via subframes and frequency bands used for the transmission of the EPDCCH associated with the DMRS. The DMRS is used for demodulation of the EPDCCH associated with the DMRS. The EPDCCH is transmitted via antenna ports used for the transmission of the DMRS. The DMRS associated with the EPDCCH is transmitted via one or more of antenna ports 107 to 114.

[0088] CSI-RS is transmitted through designated subframes. The resources for transmitting CSI-RS are configured by base station equipment 1. CSI-RS is used by terminal equipment 2 to calculate downlink channel state information. Terminal equipment 2 uses CSI-RS to perform signal measurements (channel measurements). CSI-RS supports the configuration of some or all of antenna ports 1, 2, 4, 8, 12, 16, 24, and 32. CSI-RS is transmitted through one or more of antenna ports 15 to 46. Furthermore, the antenna ports to be supported can be determined based on the terminal equipment capabilities of terminal equipment 2, the setting of RRC parameters, and / or the transmission mode to be configured.

[0089] The resources of ZP CSI-RS are configured by the upper layer. ZP CSI-RS resources are transmitted with zero output power. In other words, ZP CSI-RS resources are not transmitted. ZP PDSCH and EPDCCH are not transmitted within the ZP CSI-RS resources configured therein. For example, ZP CSI-RS resources are used by neighboring cells to transmit NZP CSI-RS. Furthermore, for example, ZP CSI-RS resources are used for measuring CSI-IM.

[0090] The resources of CSI-IM are set by base station equipment 1. CSI-IM resources are used to measure interference during CSI measurements. CSI-IM resources can be configured to overlap with some resources in ZP CSI-RS. For example, when CSI-IM resources overlap with some resources in ZP CSI-RS, signals from the cell performing CSI measurements are not transmitted in those resources. In other words, base station equipment 1 does not transmit PDSCH, EPDCCH, etc., in the resources set by CSI-IM. Therefore, terminal equipment 2 can perform CSI measurements efficiently.

[0091] MBSFN RS is transmitted over the entire frequency band of the subframe used for PMCH transmission. MBSFN RS is used for PMCH demodulation. PMCH is transmitted through the antenna port used for MBSFN RS transmission. MBSFN RS is transmitted through antenna port 4.

[0092] The PRS is used by terminal device 2 to measure the positioning of terminal device 2. The PRS is transmitted through antenna port 6.

[0093] TRS can be mapped to only predetermined subframes. For example, TRS can be mapped to subframes 0 and 5. Furthermore, TRS can utilize a configuration partially or entirely similar to CRS. For example, within each resource block, the location of the resource element to which TRS is mapped can be consistent with the location of the resource element to which CRS is mapped for antenna port 0. Additionally, the sequence (values) used for TRS can be determined based on information set via PBCH, PDCCH, EPDCCH, or PDSCH (RRC signaling). The sequence (values) used for TRS can be determined based on parameters such as cell ID (e.g., physical layer cell identifier) ​​and timeslot number. The sequence (values) used for TRS can be determined in a different manner (formula) than the method (formula) used for the sequence (values) of CRS for antenna port 0.

[0094] <Uplink physical signals in this embodiment>

[0095] PUCCH is the physical channel used to transmit uplink control information (UCI). Uplink control information includes downlink channel state information (CSI), scheduling requests (SRs) indicating a request for PUCCH resources, and HARQ-ACKs for downlink data (transport blocks (TBs) or downlink shared channel (DL-SCH)). HARQ-ACKs are also known as ACK / NACKs, HARQ feedback, or response information. Furthermore, for downlink data, HARQ-ACKs indicate ACK, NACK, or DTX.

[0096] The PUSCH is a physical channel used to transmit uplink data (Uplink Shared Channel (UL-SCH)). Additionally, the PUSCH can be used to transmit HARQ-ACK and / or channel state information along with uplink data. Furthermore, the PUSCH can be used to transmit only channel state information, or only HARQ-ACK and channel state information.

[0097] PRACH is a physical channel used to transmit the random access preamble. PRACH allows terminal device 2 to achieve synchronization with base station device 1 in the time domain. Furthermore, PRACH is used to indicate the initial connection establishment process, handover process, connection reconstruction process, synchronization (timing adjustment) for uplink transmissions, and / or requests for PUSCH resources.

[0098] In the PUCCH area, multiple PUCCHs are frequency, time, spatial, and / or code multiplexed. In the PUSCH area, multiple PUSCHs can be frequency, time, spatial, and / or code multiplexed. PUCCH and PUSCH can be frequency, time, spatial, and / or code multiplexed. PRACH can be placed on a single subframe or two subframes. Multiple PRACHs can be code multiplexed.

[0099] <Uplink physical channel in this embodiment>

[0100] The uplink DMRS is associated with the transmission of PUSCH or PUCCH. DMRS is time-multiplexed with PUSCH or PUCCH. Base station equipment 1 can use DMRS for propagation path correction of PUSCH or PUCCH. In this embodiment, PUSCH transmission also includes multiplexing and transmitting PUSCH and DMRS. In this embodiment, PUCCH transmission also includes multiplexing and transmitting PUCCH and DMRS. Furthermore, the uplink DMRS is also referred to as UL-DMRS. SRS is not associated with the transmission of PUSCH or PUCCH. Base station equipment 1 can use SRS to measure the uplink channel state.

[0101] SRS is transmitted using the last SC-FDMA symbol in the uplink subframe. In other words, SRS is placed within the last SC-FDMA symbol in the uplink subframe. Within a specific SC-FDMA symbol in a specific cell, terminal device 2 can restrict the simultaneous transmission of SRS, PUCCH, PUSCH, and / or PRACH. Terminal device 2 can transmit PUSCH and / or PUCCH using SC-FDMA symbols excluding the last SC-FDMA symbol in the uplink subframe, and transmit SRS using the last SC-FDMA symbol in the uplink subframe, within a specific uplink subframe of a specific cell. In other words, within a specific uplink subframe of a specific cell, terminal device 2 can transmit SRS, PUSCH, and PUCCH.

[0102] In SRS, trigger type 0 SRS and trigger type 1 SRS are defined as SRS with different trigger types. Trigger type 0 SRS is transmitted when parameters related to trigger type 0 SRS are set using upper-layer signaling. Trigger type 1 SRS is transmitted when parameters related to trigger type 1 SRS are set using upper-layer signaling and a transmission request is requested using an SRS request included in DCI format 0, 1A, 2B, 2C, 2D, or 4. Furthermore, for DCI format 0, 1A, or 4, the SRS request is included in both FDD and TDD, while for DCI format 2B, 2C, or 2D, it is only included in TDD. If both trigger type 0 SRS and trigger type 1 SRS transmissions occur in the same subframe of the same serving cell, the transmission of trigger type 1 SRS is given priority.

[0103] <Example of the configuration of base station device 1 in this embodiment>

[0104] Figure 3 This is a schematic block diagram illustrating the configuration of base station equipment 1 in this embodiment. For example... Figure 3 As shown in the diagram, base station equipment 1 includes an upper-layer processing unit 101, a control unit 103, a receiving unit 105, a transmitting unit 107, and a transceiver antenna 109. Furthermore, the receiving unit 105 includes a decoding unit 1051, a demodulation unit 1053, a demultiplexing unit 1055, a wireless receiving unit 1057, and a channel measurement unit 1059. Additionally, the transmitting unit 107 includes an encoding unit 1071, a modulation unit 1073, a multiplexing unit 1075, a wireless transmitting unit 1077, and a downlink reference signal generation unit 1079.

[0105] The upper-layer processing unit 101 performs processing at the Media Access Control (MAC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and Radio Resource Control (RRC) layer. Furthermore, the upper-layer processing unit 101 generates control information for the control receiving unit 105 and the transmitting unit 107, and outputs the control information to the control unit 103.

[0106] The control unit 103 controls the receiving unit 105 and the transmitting unit 107 based on control information from the upper-layer processing unit 101. The control unit 103 generates control information to be transmitted to the upper-layer processing unit 101 and outputs the control information to the upper-layer processing unit 101. The control unit 103 receives the decoded signal from the decoding unit 1051 and the channel estimation result from the channel measurement unit 1059. The control unit 103 outputs the signal to be encoded to the encoding unit 1071. Furthermore, the control unit 103 can be used to control all or part of the base station equipment 1.

[0107] The upper-layer processing unit 101 performs processing and management related to radio resource control, subframe setting, scheduling control, and / or CSI report control. Each terminal device or terminal devices connected to the base station device jointly perform the processing and management in the upper-layer processing unit 101. The processing and management in the upper-layer processing unit 101 can be performed solely by the upper-layer processing unit 101, or it can be obtained from a higher node or another base station device.

[0108] In the radio resource control of the upper-layer processing unit 101, downlink data (transmission blocks), system information, RRC messages (RRC parameters) and / or MAC control elements (CE) are generated and / or managed.

[0109] In the subframe setting within the upper-layer processing unit 101, management is performed on subframe settings, subframe mode settings, uplink-downlink settings, uplink reference UL-DL settings, and / or downlink reference UL-DL settings. Furthermore, the subframe settings in the upper-layer processing unit 101 are also referred to as base station subframe settings. Moreover, the subframe settings in the upper-layer processing unit 101 can be determined based on uplink and downlink traffic. Additionally, the subframe settings in the upper-layer processing unit 101 can be determined based on the scheduling results of the scheduling control within the upper-layer processing unit 101.

[0110] In the scheduling control within the upper-layer processing unit 101, based on the received channel state information, the estimated propagation path input from the channel measurement unit 1059, channel quality, and similar factors, the unit determines the frequency and subframe allocated to the physical channels (PDSCH and PUSCH), the coding rate, modulation scheme, and transmit power of the physical channels (PDSCH and PUSCH), etc. For example, the control unit 103 generates control information (DCI format) based on the scheduling results of the scheduling control in the upper-layer processing unit 101.

[0111] In the CSI report control of the upper-layer processing unit 101, the CSI report of the terminal device 2 is controlled. For example, settings related to the CSI reference resources assumed to be used for calculating CSI are controlled in the terminal device 2.

[0112] Under the control of the control unit 103, the receiving unit 105 receives signals transmitted from the terminal device 2 via the transceiver antenna 109, performs reception processing such as demultiplexing, demodulation, and decoding, and outputs the processed information to the control unit 103. Furthermore, the reception processing in the receiving unit 105 is performed according to pre-defined settings or settings notified from the base station device 1 to the terminal device 2.

[0113] The wireless receiving unit 1057 performs the following on the uplink signal received via the transceiver antenna 109: down-conversion to intermediate frequency, removal of unnecessary frequency components, control of the amplification level so that the signal level is properly maintained, quadrature demodulation based on the in-phase and quadrature components of the received signal, conversion from analog to digital signal, removal of guard interval (GI), and / or extraction of the signal in the frequency domain using Fast Fourier Transform (FFT).

[0114] The demultiplexing unit 1055 separates the uplink channel, such as PUCCH or PUSCH, and / or the uplink reference signal from the signal input from the wireless receiving unit 1057. The demultiplexing unit 1055 outputs the uplink reference signal to the channel measurement unit 1059. The demultiplexing unit 1055 compensates for the propagation path of the uplink channel based on the estimated propagation path input from the channel measurement unit 1059.

[0115] The demodulation unit 1053 demodulates the received signal using modulation schemes such as Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64 QAM, or 256 QAM for the modulation symbols of the uplink channel. The demodulation unit 1053 performs separation and demodulation of the MIMO multiplexed uplink channel.

[0116] Decoding unit 1051 decodes the coded bits of the demodulated uplink channel. The decoded uplink data and / or uplink control information are output to control unit 103. Decoding unit 1051 decodes each transport block of PUSCH.

[0117] The channel measurement unit 1059 takes the uplink reference signal input to the self-division unit 1055, measures the estimated propagation path, channel quality, and / or other values, and outputs the estimated propagation path, channel quality, and / or other values ​​to the division unit 1055 and / or the control unit 103. For example, it measures the estimated propagation path for propagation path compensation for PUCCH or PUSCH using UL-DMRS, and measures the uplink channel quality using SRS.

[0118] The transmitting unit 107, under the control of the control unit 103, performs transmission processing such as encoding, modulation, and multiplexing on the downlink control information and downlink data input from the upper-layer processing unit 101. For example, the transmitting unit 107 generates and multiplexes PHICH, PDCCH, EPDCCH, PDSCH, and downlink reference signals to generate a transmission signal. Furthermore, the transmission processing in the transmitting unit 107 is performed according to predefined settings, settings notified from the base station device 1 to the terminal device 2, or settings notified via PDCCH or EPDCCH transmitted in the same subframe.

[0119] The coding unit 1071 encodes the HARQ indication (HARQ-ACK), downlink control information, and downlink data input from the control unit 103 using a predetermined coding method such as block coding, convolutional coding, or turbo coding. The modulation unit 1073 modulates the coded bits input from the coding unit 1071 using a predetermined modulation method such as BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. The downlink reference signal generation unit 1079 generates a downlink reference signal based on the physical cell identifier (PCI), RRC parameters set in the terminal device 2, etc. The multiplexing unit 1075 multiplexes the modulation symbols and downlink reference signals of each channel and arranges the resulting data in predetermined resource elements.

[0120] The wireless transmitting unit 1077 processes the signal from the multiplexing unit 1075 through various methods, such as inverse fast Fourier transform (IFFT) to transform the signal into the time domain, adding guard intervals, generating baseband digital signals, converting them to analog signals, quadrature modulation, converting intermediate frequency signals to high frequency signals (up-conversion), removing redundant frequency components, and amplifying power, thereby generating a transmission signal. The transmission signal output from the wireless transmitting unit 1077 is transmitted through the transceiver antenna 109.

[0121] <Example of the configuration of terminal device 2 in this embodiment>

[0122] Figure 4 This is a schematic block diagram illustrating the configuration of the terminal device 2 in this embodiment. For example... Figure 4 As shown in the diagram, terminal device 2 includes an upper-layer processing unit 201, a control unit 203, a receiving unit 205, a transmitting unit 207, and a transceiver antenna 209. Furthermore, the receiving unit 205 includes a decoding unit 2051, a demodulation unit 2053, a demultiplexing unit 2055, a wireless receiving unit 2057, and a channel measurement unit 2059. Additionally, the transmitting unit 207 includes an encoding unit 2071, a modulation unit 2073, a multiplexing unit 2075, a wireless transmitting unit 2077, and an uplink reference signal generation unit 2079.

[0123] The upper-layer processing unit 201 outputs uplink data (transmission blocks) to the control unit 203. The upper-layer processing unit 201 performs processing at the Media Access Control (MAC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and Radio Resource Control (RRC) layer. Furthermore, the upper-layer processing unit 201 generates control information for controlling the receiving unit 205 and the transmitting unit 207, and outputs this control information to the control unit 203.

[0124] The control unit 203 controls the receiving unit 205 and the transmitting unit 207 based on control information from the upper-layer processing unit 201. The control unit 203 generates control information to be transmitted to the upper-layer processing unit 201 and outputs the control information to the upper-layer processing unit 201. The control unit 203 receives the decoded signal from the decoding unit 2051 and the channel estimation result from the channel measurement unit 2059. The control unit 203 outputs the signal to be encoded to the encoding unit 2071. Furthermore, the control unit 203 can be used to control all or part of the terminal device 2.

[0125] The upper-layer processing unit 201 performs processing and management related to radio resource control, subframe setting, scheduling control, and / or CSI reporting control. The processing and management in the upper-layer processing unit 201 are performed according to predefined settings and / or based on control information set or notified from the base station device 1. For example, control information from the base station device 1 includes RRC parameters, MAC control elements, or DCI.

[0126] In the radio resource control of the upper-layer processing unit 201, the setting information in the terminal device 2 is managed. In the radio resource control of the upper-layer processing unit 201, uplink data (transmission blocks), system information, RRC messages (RRC parameters) and / or MAC control elements (CE) are generated and / or managed.

[0127] In the subframe settings of the upper-layer processing unit 201, subframe settings in base station device 1 and / or base station devices different from base station device 1 are managed. Subframe settings include uplink or downlink settings for subframes, subframe mode settings, uplink-downlink settings, uplink reference UL-DL settings, and / or downlink reference UL-DL settings. Furthermore, the subframe settings in the upper-layer processing unit 201 are also referred to as terminal subframe settings.

[0128] In the scheduling control of the upper-layer processing unit 201, control information for controlling the scheduling of the receiving unit 205 and the transmitting unit 207 is generated based on the DCI (scheduling information) from the base station device 1.

[0129] In the CSI reporting control within the upper-layer processing unit 201, control related to reporting CSI to the base station device 1 is performed. For example, in the CSI reporting control, settings related to the CSI reference resources assumed for calculating the CSI by the channel measurement unit 2059 are controlled. In the CSI reporting control, resources (timing) used for reporting CSI are controlled based on DCI and / or RRC parameters.

[0130] Under the control of the control unit 203, the receiving unit 205 receives signals transmitted from the base station equipment 1 via the transceiver antenna 209, performs reception processing such as demultiplexing, demodulation, and decoding, and outputs the processed information to the control unit 203. Furthermore, the reception processing in the receiving unit 205 is performed according to pre-defined settings or notifications or settings from the base station equipment 1.

[0131] The wireless receiving unit 2057 performs the following on the uplink signal received via the transceiver antenna 209: down-conversion to intermediate frequency, removal of unnecessary frequency components, control of amplification level to maintain the signal level appropriately, quadrature demodulation based on the in-phase and quadrature components of the received signal, conversion from analog to digital signal, removal of guard interval (GI), and / or extraction of the signal in the frequency domain using Fast Fourier Transform (FFT).

[0132] The demultiplexing unit 2055 separates downlink channels, such as PHICH, PDCCH, EPDCCH, or PDSCH, downlink synchronization signals, and / or downlink reference signals from the signals input from the wireless receiving unit 2057. The demultiplexing unit 2055 outputs the uplink reference signal to the channel measurement unit 2059. Based on the propagation path estimate input from the channel measurement unit 2059, the demultiplexing unit 2055 compensates for the propagation path of the uplink channel.

[0133] The demodulation unit 2053 demodulates the received signal using modulation schemes such as BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM for the modulation symbols of the downlink channel. The demodulation unit 2053 performs separation and demodulation of the MIMO multiplexed downlink channel.

[0134] Decoding unit 2051 decodes the coded bits of the demodulated downlink channel. The decoded downlink data and / or downlink control information are output to control unit 203. Decoding unit 2051 decodes each transport block of the PDSCH.

[0135] The channel measurement unit 2059 receives the downlink reference signal from the input self-division unit 2055, measures the estimated propagation path and / or channel quality, and outputs the estimated propagation path and / or channel quality to the division unit 2055 and / or the control unit 203. The downlink reference signal used for measurement by the channel measurement unit 2059 can be determined at least based on the transmission mode set by the RRC parameters and / or other RRC parameters. For example, via DL-DMRS, the estimated propagation path used for propagation path compensation for PDSCH or EPDCCH is measured. via CRS, the estimated propagation path used for propagation path compensation for PDCCH or PDSCH, and / or the downlink channel used for reporting CSI is measured. via CSI-RS, the downlink channel used for reporting CSI is measured. The channel measurement unit 2059 calculates the reference signal received power (RSRP) and / or reference signal received quality (RSRQ) based on the CRS, CSI-RS, or discovery signal, and outputs the RSRP and / or RSRQ to the upper-layer processing unit 201.

[0136] The transmitting unit 207, under the control of the control unit 203, performs transmission processing such as encoding, modulation, and multiplexing on the uplink control information and uplink data input from the upper-layer processing unit 201. For example, the transmitting unit 207 generates and multiplexes uplink channels such as PUSCH or PUCCH, and / or uplink reference signals, thereby generating a transmission signal. Furthermore, the transmission processing in the transmitting unit 207 is performed according to predefined settings or settings set or notified by the base station device 1.

[0137] Encoding unit 2071 encodes the HARQ indication (HARQ-ACK), uplink control information, and uplink data input from control unit 203 using predetermined encoding methods such as block coding, convolutional coding, and turbo coding. Modulation unit 2073 modulates the coded bits input from encoding unit 2071 using predetermined modulation methods such as BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. Uplink reference signal generation unit 2079 generates an uplink reference signal based on RRC parameters set in terminal device 2. Multiplexing unit 2075 multiplexes the modulation symbols and uplink reference signals of each channel and arranges the resulting data in predetermined resource elements.

[0138] The wireless transmitting unit 2077 processes the signal from the multiplexing unit 2075 through various methods, such as inverse fast Fourier transform (IFFT) to convert the signal to the time domain, adding guard intervals, generating baseband digital signals, converting to analog signals, quadrature modulation, converting intermediate frequency signals to high frequency signals (up-conversion), removing redundant frequency components, and amplifying power, thereby generating a transmission signal. The transmission signal output from the wireless transmitting unit 2077 is transmitted through the transceiver antenna 209.

[0139] <Signaling of control information in this embodiment>

[0140] Base station equipment 1 and terminal equipment 2 can use various methods for signaling control information (notification, broadcast, or setting). Control information signaling can be performed at various layers. Control information signaling includes: physical layer signaling, which is signaling conducted through the physical layer; RRC signaling, which is signaling conducted through the RRC layer; and MAC signaling, which is signaling conducted through the MAC layer. RRC signaling is a dedicated RRC signaling used to notify control information specific to terminal equipment 2, or a common RRC signaling used to notify control information specific to base station equipment 1. Signaling used by layers higher than the physical layer (such as RRC signaling and MAC signaling) is also called upper-layer signaling.

[0141] RRC signaling is implemented by signaling RRC parameters. MAC signaling is implemented by signaling MAC control elements. Physical layer signaling is implemented by signaling downlink control information (DCI) or uplink control information (UCI). RRC parameters and MAC control elements are transmitted using PDSCH or PUSCH. DCI is transmitted using PDCCH or EPDCCH. UCI is transmitted using PUCCH or PUSCH. RRC and MAC signaling are used to signal semi-static control information, also known as semi-static signaling. Physical layer signaling is used to signal dynamic control information, also known as dynamic signaling. DCI is used for PDSCH scheduling or PUSCH scheduling. UCI is used for CSI reporting, HARQ-ACK reporting, and / or scheduling requests (SR).

[0142] <Details of the downlink control information in this embodiment>

[0143] DCI (Distributed Control Information) is a notification using a DCI format with predefined fields. Predefined information bits are mapped to fields specified in the DCI format. DCI notifies downlink scheduling information, uplink scheduling information, lateral link scheduling information, requests for aperiodic CSI (Continuous Service Index) reports, or uplink transmission power commands.

[0144] The DCI format monitored by terminal device 2 is determined according to the transmission mode set for each serving cell. In other words, a portion of the DCI format monitored by terminal device 2 may differ depending on the transmission mode. For example, terminal device 2 configured with downlink transmission mode 1 monitors DCI format 1A and DCI format 1. For example, terminal device 2 configured with downlink transmission mode 4 monitors DCI format 1A and DCI format 2. For example, terminal device 2 configured with uplink transmission mode 1 monitors DCI format 0. For example, terminal device 2 configured with uplink transmission mode 2 monitors DCI format 0 and DCI format 4.

[0145] The control area containing the PDCCH used to notify terminal device 2 of the DCI is not notified, and terminal device 2 detects the DCI for terminal device 2 through blind decoding (blind detection). Specifically, terminal device 2 monitors a set of candidate PDCCHs in the serving cell. The monitoring instruction attempts to decode each PDCCH in the set according to all DCI formats to be monitored. For example, terminal device 2 attempts to decode all aggregation levels, candidate PDCCHs, and DCI formats that may be transmitted to terminal device 2. Terminal device 2 identifies the successfully decoded (detected) DCI (PDCCH) as the DCI (PDCCH) for terminal device 2.

[0146] For DCI, a Cyclic Redundancy Check (CRC) is added. CRC is used for DCI error detection and blind DCI detection. The CRC parity bits are scrambled using the RNTI. Terminal device 2 checks whether the RNTI corresponds to its DCI. Specifically, terminal device 2 uses a predetermined RNTI to descramble the bits corresponding to the CRC, extracts the CRC, and checks whether the corresponding DCI is correct.

[0147] RNTIs are defined or set according to the purpose or use of DCI. RNTIs include Cell-RNTI (C-RNTI), Semi-Persistent Scheduling-RNTI (SPS C-RNTI), System Information-RNTI (SI-RNTI), Paging-RNTI (P-RNTI), Random Access-RNTI (RA-RNTI), Transmit Power Control-PUCCH-RNTI (TPC-PUCCH-RNTI), Transmit Power Control-PUSCH-RNTI (TPC-PUSCH-RNTI), Temporary C-RNTI, Multimedia Broadcast Multicast Service (MBMS)-RNTI (M-RNTI), and eIMTA-RNTI.

[0148] C-RNTI and SPS C-RNTI are RNTIs specific to terminal device 2 within base station equipment 1 (cell) and serve as identifiers for terminal device 2. C-RNTI is used to schedule PDSCH or PUSCH in a specific subframe. SPS C-RNTI is used to initiate or de-schedule periodic scheduling of resources for PDSCH or PUSCH. A control channel with a CRC scrambled using SI-RNTI is used to schedule System Information Blocks (SIBs). A control channel with a CRC scrambled using P-RNTI is used to control paging. A control channel with a CRC scrambled using RA-RNTI is used to schedule responses to RACH. A control channel with a CRC scrambled using TPC-PUCCH-RNTI is used for PUCCH power control. A control channel with a CRC scrambled using TPC-PUSCH-RNTI is used for PUSCH power control. A control channel with a CRC scrambled using temporary C-RNTI is used by mobile station equipment in which C-RNTI is not set or identified. A control channel with a CRC scrambled using M-RNTI is used for MBMS scheduling. A control channel with a CRC scrambled using eIMTA-RNTI is used in Dynamic TDD (eIMTA) to notify information related to the TDD UL / DL settings of the TDD serving cell. Furthermore, a new RNTI, instead of the aforementioned RNTI, can be used to scramble the DCI format.

[0149] <Details of the downlink control channel in this embodiment>

[0150] DCI is transmitted using PDCCH or EPDCCH. Terminal device 2 monitors the set of candidate PDCCHs and / or the set of candidate EPDCCHs of one or more active serving cells configured using RRC signaling. Here, monitoring means attempting to decode the PDCCHs and / or EPDCCHs in the set corresponding to all DCI formats to be monitored.

[0151] The set of candidate PDCCHs or candidate EPDCCHs is also called the search space. Within the search space, a shared search space (CSS) and a terminal-specific search space (USS) are defined. A CSS can be defined only for the search space concerning the PDCCH.

[0152] The common search space (CSS) is a search space defined based on parameters specific to base station device 1 and / or predefined parameters. For example, the CSS is a search space shared by multiple terminal devices. Thus, base station device 1 maps the common control channels of multiple terminal devices to the CSS, thereby reducing the resources used to transmit control channels.

[0153] The UE-specific search space (USS) is a search space configured using parameters specific to terminal device 2. Therefore, the USS is a search space specific to terminal device 2 and can independently transmit control channels specific to terminal device 2. Thus, base station device 1 can efficiently map control channels specific to multiple terminal devices.

[0154] The USS can be configured for shared use across multiple terminal devices. Because a shared USS is configured across multiple terminal devices, parameters specific to terminal device 2 are set to the same value across all terminal devices. For example, the unit for setting the same parameters across multiple terminal devices could be a cell, transmission point, or a group of predetermined terminal devices.

[0155] The search space for each aggregation level is defined by a set of candidate PDCCHs. Each PDCCH is transmitted using one or more sets of CCEs. The number of CCEs used in a single PDCCH is also referred to as the aggregation level. For example, the number of CCEs used in a single PDCCH may be 1, 2, 4, or 8.

[0156] The search space for each aggregation level is defined by a set of candidate EPDCCHs. Each EPDCCH is transmitted using one or more Enhanced Control Channel Elements (ECCEs). The number of ECCEs used in a single EPDCCH is also referred to as the aggregation level. For example, the number of ECCEs used in a single EPDCCH can be 1, 2, 4, 8, 16, or 32.

[0157] The number of candidate PDCCHs or candidate EPDCCHs is determined at least based on the search space and aggregation level. For example, in CSS, the number of candidate PDCCHs in aggregation levels 4 and 8 are 4 and 2, respectively. For example, in USS, the number of candidate PDCCHs in aggregations 1, 2, 4, and 8 are 6, 6, 2, and 2, respectively.

[0158] Each ECCE includes multiple EREGs. EREGs are used to define the mapping to resource elements of the EPDCCH. Within each RB pair, 16 EREGs are defined, numbered 0 to 15. In other words, within each RB pair, EREGs 0 to EREG 15 are defined. Within each RB pair, for resource elements other than those to which predetermined signals and / or channels are mapped, EREGs 0 to EREG 15 are preferably defined at regular intervals in the frequency direction. For example, no EREG is defined for resource elements mapped to which demodulation reference signals associated with the EPDCCH transmitted through antenna ports 107 to 110 are mapped.

[0159] The number of ECCEs used in a single EPDCCH depends on the EPDCCH format and is determined by other parameters. The number of ECCEs used in a single EPDCCH is also known as the aggregation level. For example, the number of ECCEs used in a single EPDCCH is determined by the number of resource elements available for transmission of the EPDCCH in a single RB pair, the EPDCCH transmission method, etc. For example, the number of ECCEs used in a single EPDCCH can be 1, 2, 4, 8, 16, or 32. Furthermore, the number of EREGs used in a single ECCE is determined by the subframe type and the cyclic prefix type, and is either 4 or 8. As for the EPDCCH transmission method, distributed transmission and local transmission are supported.

[0160] Distributed or localized transmission can be used in EPDCCH. Distributed and localized transmissions differ in their mapping from ECCE to EREG and RB pairs. For example, in distributed transmission, one ECCE is constructed using EREGs with multiple RB pairs. In localized transmission, one ECCE is constructed using EREGs with one RB pair.

[0161] Base station device 1 performs EPDCCH-related settings in terminal device 2. Terminal device 2 monitors multiple EPDCCHs based on the settings from base station device 1. A set of RB pairs of EPDCCHs that terminal device 2 monitors can be configured. This set of RB pairs is also called an EPDCCH set or an EPDCCH-PRB set. One or more EPDCCH sets can be configured in one terminal device 2. Each EPDCCH set includes one or more RB pairs. Furthermore, EPDCCH-related settings can be performed individually for each EPDCCH set.

[0162] Base station equipment 1 can configure a predetermined number of EPDCCH sets in terminal equipment 2. For example, up to two EPDCCH sets can be configured as EPDCCH set 0 and / or EPDCCH set 1. Each EPDCCH set can consist of a predetermined number of RB pairs. Each EPDCCH set constitutes one set of ECCEs. The number of ECCEs constituted in one EPDCCH set is determined by the number of RB pairs configured as EPDCCH sets and the number of EREGs used in one ECCE. When the number of ECCEs constituted in one EPDCCH set is N, each EPDCCH set constitutes ECCEs 0 to N-1. For example, when the number of EREGs used in one ECCE is 4, an EPDCCH set consisting of 4 RB pairs constitutes 16 ECCEs.

[0163] <Details of the channel state information in this embodiment>

[0164] Terminal device 2 reports CSI to base station device 1. The time and frequency resources used for CSI reporting are controlled by base station device 1. In terminal device 2, CSI-related settings are performed from base station device 1 via RRC signaling. In terminal device 2, one or more CSI processes are configured according to a predetermined transmission mode. The CSI reported by terminal device 2 corresponds to a CSI process. For example, a CSI process is a unit of control or configuration related to CSI. For each CSI process, settings related to CSI-RS resources, CSI-IM resources, periodic CSI reporting (e.g., reporting period and offset), and / or non-periodic CSI reporting can be configured independently.

[0165] CSI includes Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Precoding Type Indicator (PTI), Rank Indicator (RI), and / or CSI-RS Resource Indicator (CRI). RI indicates the number of transmission layers (the number of ranks). PMI is information indicating a predefined precoding matrix. PMI uses one or two pieces of information to indicate one precoding matrix. When two pieces of information are used, PMI is also referred to as the first PMI and the second PMI. CQI is information indicating a predefined combination of modulation scheme and coding rate. CRI is information indicating one CSI-RS resource selected from two or more CSI-RS resources when two or more CSI-RS resources are set in one CSI process (single instance). Terminal device 2 reports the CSI recommended to base station device 1. Terminal device 2 reports the CQI that meets the predetermined reception quality for each transport block (codeword).

[0166] In the CRI report, one CSI-RS resource is selected from the CSI-RS resources to be configured. When reporting CRI, the PMI, CQI, and RI to be reported are calculated (selected) based on the reported CRI. For example, if the CSI-RS resource to be configured is precoded, terminal device 2 reports the CRI so that the report is suitable for the precoding (beaming) of terminal device 2.

[0167] The subframes (report instances) that can perform periodic CSI reporting are determined based on the reporting period and subframe offset set using upper-layer parameters (CQIPMI index, RI index, and CRI index). Furthermore, upper-layer parameters can be set independently within the subframe set used for CSI measurement. When only one piece of information is set across multiple subframe sets, this information can be set commonly across all subframe sets. Within each serving cell, one or more periodic CSI reports are set using upper-layer signaling.

[0168] CSI report types support PUCCH CSI report mode. CSI report types are also known as PUCCH report types. Type 1 reports support feedback on CQI for the selected subband. Type 1a reports support feedback on subband CQI and second PMI. Type 2, Type 2b, and Type 2c reports support feedback on broadband CQI and PMI. Type 2a reports support feedback on broadband PMI. Type 3 reports support RI feedback. Type 4 reports support feedback on broadband CQI. Type 5 reports support feedback on RI and broadband PMI. Type 6 reports support feedback on RI and PTI. Type 7 reports support feedback on CRI and RI. Type 8 reports support feedback on CRI, RI, and broadband PMI. Type 9 reports support feedback on CRI, RI, and PTI. Type 10 reports support feedback on CRI.

[0169] In terminal device 2, information related to CSI measurement and CSI reporting is set from base station device 1. CSI measurement is performed based on reference signals and / or reference resources (e.g., CRS, CSI-RS, CSI-IM resources, and / or DRS). The reference signals used for CSI measurement are determined based on settings such as the transmission mode. CSI measurement is performed based on channel measurement and interference measurement. For example, channel measurement measures the power of the desired cell. Interference measurement measures the power and noise power of cells other than the desired cell.

[0170] For example, in CSI measurement, terminal device 2 performs channel measurement and interference measurement based on CRS. For example, in CSI measurement, terminal device 2 performs channel measurement based on CSI-RS and interference measurement based on CRS. For example, in CSI measurement, terminal device 2 performs channel measurement based on CSI-RS and interference measurement based on CSI-IM resources.

[0171] The CSI process is configured using upper-layer signaling as information specific to terminal device 2. Terminal device 2 configures one or more CSI processes and performs CSI measurements and reports based on these configurations. For example, if multiple CSI processes are configured, terminal device 2 independently reports multiple CSIs based on these processes. Each CSI process includes settings for cell status information, a CSI process identifier, configuration information related to CSI-RS, configuration information related to CSI-IM, a subframe mode set for CSI reporting, configuration information related to periodic CSI reporting, and configuration information related to non-periodic CSI reporting. Furthermore, the settings for cell status information can be shared by multiple CSI processes.

[0172] Terminal device 2 uses CSI reference resources to perform CSI measurements. For example, terminal device 2 uses a set of downlink physical resource blocks indicated by the CSI reference resources to measure CSI when transmitting PDSCH. In this case, where the CSI subframe set is set by upper-layer signaling, each CSI reference resource belongs to one of the CSI subframe sets, not two of them.

[0173] In the frequency direction, CSI reference resources are defined by a set of downlink physical resource blocks corresponding to the frequency band associated with the measured CQI value.

[0174] In the strata (spatial) direction, the CSI reference resource is defined by the RI and PMI, which are set according to the measured CQI. In other words, in the strata (spatial) direction, the CSI reference resource is defined by the RI and PMI that are envisioned or generated when the CQI is measured.

[0175] In the temporal direction, CSI reference resources are defined by one or more predetermined downlink subframes. Specifically, CSI reference resources are defined by a predetermined number of valid subframes preceding the CSI reporting subframe. The predetermined number of subframes used to define CSI reference resources is determined based on the transmission mode, frame structure type, number of CSI processes to be set, and / or CSI reporting mode. For example, in the case where one CSI process and a periodic CSI reporting mode are set in terminal device 2, the minimum number of predetermined subframes used to define CSI reference resources among valid downlink subframes is 4 or greater.

[0176] A valid subframe is a subframe that meets predetermined conditions. A downlink subframe in the serving cell is considered valid if some or all of the following conditions are met:

[0177] (1) A valid downlink subframe is a subframe in the ON state in the terminal device 2 in which the RRC parameters related to the ON and OFF states are set.

[0178] (2) In terminal device 2, a valid downlink subframe is set as a downlink subframe;

[0179] (3) In the predetermined transmission mode, the effective downlink subframe is not a Multimedia Broadcast Multicast Service Single Frequency Network (MBSFN) subframe;

[0180] (4) The effective downlink subframes are not included in the measurement interval (measurement gap) set in terminal device 2;

[0181] (5) In a periodic CSI report, when the CSI subframe set is set in terminal device 2, the effective downlink subframe is an element or part of the CSI subframe set linked to the periodic CSI report.

[0182] (6) In a non-periodic CSI report for a CSI process, a valid downlink subframe is an element or part of a set of CSI subframes linked to the downlink subframe associated with the corresponding CSI request in the uplink DCI format. Under these conditions, in terminal device 2, a predetermined transmission mode, multiple CSI processes, and a set of CSI subframes set for each CSI process are configured.

[0183] <Details of multi-carrier transmission in this embodiment>

[0184] For terminal device 2, multiple cells are configured, and terminal device 2 can perform multi-carrier transmission. Communication using multiple cells by terminal device 2 is referred to as carrier aggregation (CA) or dual connectivity (DC). The content described in this embodiment can be applied to each or some of the multiple cells configured in terminal device 2. The cells configured in terminal device 2 are also referred to as serving cells.

[0185] In CA, the multiple serving cells to be configured include one primary cell (PCell) and one or more secondary cells (SCell). In the terminal device 2 that supports CA, one primary cell and one or more secondary cells can be configured.

[0186] A primary cell is the serving cell that initiates the initial connection establishment process, the serving cell that begins the initial connection reconstruction process, or the cell designated as the primary cell during handover. The primary cell operates on the primary frequency. A secondary cell can be designated after a connection is established or reconstructed. The secondary cell operates on the secondary frequency. Furthermore, the connection is also referred to as an RRC connection.

[0187] DC refers to the operation in which a predetermined terminal device 2 consumes radio resources provided from at least two different network points. The network points are a primary base station device (primary eNB (MeNB)) and a secondary base station device (secondary eNB (SeNB)). In dual connectivity, terminal device 2 establishes an RRC connection through at least two network points. In dual connectivity, the two network points can be connected via a non-ideal backhaul line.

[0188] In a data center (DC), base station equipment 1, which is at least connected to the S1-MME and acts as a mobile anchor point in the core network, is referred to as the primary base station equipment. Furthermore, base station equipment 1 that is not a primary base station equipment providing additional radio resources to terminal equipment 2 is referred to as a secondary base station equipment. The group of serving cells associated with the primary base station equipment is also referred to as the primary cell group (MCG). The group of serving cells associated with the secondary base station equipment is also referred to as the secondary cell group (SCG).

[0189] In a DC (Distributed Cell), the primary cell belongs to the MCG (Multi-Cell Group). Furthermore, in an SCG (Supported Cell Group), the secondary cell corresponding to the primary cell is called a Primary Auxiliary Cell (PSCell). A PSCell (the base station equipment constituting the PSCell) can support the same functions (capabilities and performance) as a PCell (the base station equipment constituting the PCell). However, a PSCell may only support some of the functions of a PCell. For example, a PSCell may support PDCCH transmission using a search space different from CSS (CSS) or USS (USS). Furthermore, a PSCell can be constantly active. Additionally, a PSCell is a cell capable of receiving PUCCH (Programmable Continuous Cell).

[0190] In the DC, radio bearers (Data Radio Bearer (DRB) and / or Signaling Radio Bearer (SRB)) can be allocated independently via MeNB and SeNB. The duplex mode can be configured independently in each MCG (PCell) and SCG (PSCell). The MCG (PCell) and SCG (PSCell) do not need to be synchronized. Multiple timing parameters (Timing Advance Groups (TAGs)) can be independently configured in both the MCG (PCell) and SCG (PSCell). In dual connectivity, terminal device 2 transmits the UCI corresponding to the cell in the MCG only via the MeNB (PCell) and the UCI corresponding to the cell in the SCG only via the SeNB (pSCell). In the transmission of each UCI, within each cell group, a transmission method utilizing PUCCH and / or PUSCH is applied.

[0191] PUCCH and PBCH (MIB) are transmitted only through PCell or PSCell. Furthermore, PRACH is transmitted only through PCell or PSCell, provided that no multiple tags are set between cells in the CG.

[0192] Semi-persistent scheduling (SPS) or discontinuous transmission (DRX) can be performed in PCells or PSCells. In secondary cells, the same DRX as in PCells or PSCells within the same cell group can be performed.

[0193] In secondary cells, information / parameters related to MAC settings are largely shared with the PCell or PSCell in the same cell group. Some parameters can be set for each secondary cell. Some timers or counters may only apply to the PCell or PSCell.

[0194] In CA, cells using TDD and cells using FDD can be aggregated. When TDD and FDD cells are aggregated, this disclosure is applicable to either the TDD or FDD cells.

[0195] Terminal device 2 sends information indicating the combination of frequency bands that it supports CA to base station device 1. Terminal device 2 also sends information indicating whether simultaneous transmission and reception are supported in multiple serving cells across multiple different frequency bands for each frequency band combination to base station device 1.

[0196] <Details of resource allocation in this embodiment>

[0197] Base station equipment 1 can utilize various methods to allocate PDSCH and / or PUSCH resources to terminal equipment 2. These resource allocation methods include dynamic scheduling, semi-persistent scheduling, multi-subframe scheduling, and cross-subframe scheduling.

[0198] In dynamic scheduling, one DCI allocates resources within one subframe. Specifically, the PDCCH or EPDCCH in a specific subframe schedules the PDSCH in that subframe. The PDCCH or EPDCCH in a specific subframe schedules the PUSCH in a predetermined subframe following that specific subframe.

[0199] In multi-subframe scheduling, one DCI allocates resources in one or more subframes. Specifically, the PDCCH or EPDCCH in a specific subframe schedules the PDSCH in one or more subframes following that specific subframe. The PDCCH or EPDCCH in a specific subframe schedules the PUSCH in one or more subframes following that subframe. The predetermined number can be set to zero or a larger integer. The predetermined number can be predefined or determined based on physical layer signaling and / or RRC signaling. In multi-subframe scheduling, consecutive subframes can be scheduled, or subframes with a predetermined period can be scheduled. The number of subframes to be scheduled can be predefined or determined based on physical layer signaling and / or RRC signaling.

[0200] In cross-subframe scheduling, one DCI allocates resources in one subframe. Specifically, the PDCCH or EPDCCH in a specific subframe schedules the PDSCH in one subframe a predetermined number of times following that specific subframe. The PDCCH or EPDCCH in a specific subframe schedules the PUSCH in one subframe a predetermined number of times following that subframe. The predetermined number can be set to zero or a larger integer. The predetermined number can be predefined or determined based on physical layer signaling and / or RRC signaling. In cross-subframe scheduling, consecutive subframes can be scheduled, or subframes with a predetermined period can be scheduled.

[0201] In Semi-Persistent Scheduling (SPS), one DCI allocates resources in one or more subframes. Upon setting SPS-related information via RRC signaling and detecting a PDCCH or EPDCCH for initiating SPS, terminal device 2 initiates SPS-related processing and receives predetermined PDSCH and / or PUSCH according to the SPS-related settings. Upon detecting a PDCCH or EPDCCH for deactivating SPS when initiating SPS, terminal device 2 deactivates (cancels) SPS and stops receiving predetermined PDSCH and / or PUSCH. SPS deactivation can be performed based on the satisfaction of predetermined conditions. For example, SPS is deactivated upon receiving a predetermined number of empty data transmissions. Empty data transmissions used to deactivate SPS correspond to MAC Protocol Data Units (PDUs) including zero MAC Service Data Units (SDUs).

[0202] Information related to SPS using RRC signaling includes the SPS C-RNTI as the SPN RNTI, information related to the period (interval) for scheduling PDSCH therein, information related to the period (interval) for scheduling PUSCH therein, information related to the setting used to deactivate SPS, and / or the number of HARQ processes in the SPS. SPS is supported only in the primary cell and / or primary-secondary cell.

[0203] <Details of the downlink resource element mapping in this embodiment>

[0204] Figure 5 This is a diagram illustrating an example of downlink resource element mapping in this embodiment. In this example, the set of resource elements in a resource block pair will be described when the number of OFDM symbols in one resource block and one time slot is seven. Furthermore, the seven OFDM symbols in the first half of the time direction in the resource block pair are also referred to as time slot 0 (first time slot). The seven OFDM symbols in the second half of the time direction in the resource block pair are also referred to as time slot 1 (second time slot). Furthermore, the OFDM symbols in each time slot (resource block) are indicated by OFDM symbol numbers 0 to 6. Furthermore, the subcarriers in the frequency direction of the resource block pair are indicated by subcarrier numbers 0 to 11. Furthermore, when the system bandwidth consists of multiple resource blocks, different subcarrier numbers are allocated within the system bandwidth. For example, when the system bandwidth consists of six resource blocks, subcarriers assigned subcarrier numbers 0 to 71 are used. Furthermore, in the description of this embodiment, resource element (k, l) is a resource element indicated using subcarrier number k and OFDM symbol number l.

[0205] The resource elements R0 to R3 indicate the cell-specific reference signals for antenna ports 0 to 3, respectively. Hereinafter, the cell-specific reference signals for antenna ports 0 to 3 are also referred to as the cell-specific RS (CRS). In this example, the case where there are 4 antenna ports for the CRS is described, but this number can be changed. For example, the CRS can utilize one antenna port or two antenna ports. Furthermore, the CRS can be shifted in the frequency direction according to the cell ID. For example, the CRS can be shifted in the frequency direction according to the remainder obtained by dividing the cell ID by 6.

[0206] Resource elements C1 to C4 indicate reference signals (CSI-RS) used to measure the transmission path status of antenna ports 15 to 22. These resource elements respectively indicate the CSI-RS for Code Division Multiplexing (CDM) groups 1 to 4. The CSI-RS consists of orthogonal sequences (orthogonal codes) using Walsh codes and scrambling codes using pseudo-random sequences. Furthermore, within a CDM group, the CSI-RS is code-division multiplexed using orthogonal codes such as Walsh codes. Additionally, between CDM groups, the CSI-RS is mutually frequency-division multiplexed (FDM).

[0207] The CSI-RS of antenna ports 15 and 16 are mapped to C1. The CSI-RS of antenna ports 17 and 18 are mapped to C2. The CSI-RS of antenna ports 19 and 20 are mapped to C3. The CSI-RS of antenna ports 21 and 22 are mapped to C4.

[0208] Multiple antenna ports of CSI-RS are specified. CSI-RS can be configured as a reference signal corresponding to eight antenna ports (15-22). Additionally, CSI-RS can be configured as a reference signal corresponding to four antenna ports (15-18). Furthermore, CSI-RS can be configured as a reference signal corresponding to two antenna ports (15-16). Additionally, CSI-RS can be configured as a reference signal corresponding to one antenna port (15). CSI-RS can be mapped to several subframes; for example, CSI-RS can be mapped every two or more subframes. Multiple mapping modes are specified for CSI-RS resource elements. Furthermore, base station equipment 1 can configure multiple CSI-RS in terminal equipment 2.

[0209] CSI-RS can be set to 0 transmit power. A CSI-RS with zero transmit power is also called a zero-power CSI-RS. The zero-power CSI-RS is set independently of the CSI-RS at antenna ports 15-22. Furthermore, the CSI-RS at antenna ports 15-22 are also referred to as non-zero-power CSI-RS.

[0210] Base station equipment 1 configures CSI-RS via RRC signaling as control information specific to terminal equipment 2. In terminal equipment 2, CSI-RS is configured by base station equipment 1 via RRC signaling. Furthermore, terminal equipment 2 can configure CSI-IM resources for measuring interference power. Based on the settings from base station equipment 1, terminal equipment 2 generates feedback information using CSI-RS and / or CSI-IM resources.

[0211] Resource elements D1 and D2 indicate DL-DMRS for CDM group 1 and CDM group 2, respectively. DL-DMRS are constructed using orthogonal sequences (orthogonal codes) employing Walsh codes and scrambling sequences according to pseudo-random sequences. Furthermore, DL-DMRS are independent for each antenna port and can be multiplexed within each resource block pair. DL-DMRS are mutually orthogonal between antenna ports according to CDM and / or FDM. Each DL-DMRS undergoes CDM within a CDM group according to orthogonal codes. DL-DMRS undergo FDM between CDM groups. DL-DMRS within the same CDM group are mapped to the same resource element. For DL-DMRS within the same CDM group, different orthogonal sequences are used between antenna ports, and these orthogonal sequences are mutually orthogonal. DL-DMRS used for PDSCH can use some or all of the eight antenna ports (antenna ports 7-14). In other words, PDSCH associated with DL-DMRS can perform up to 8-rank MIMO transmission. The DL-DMRS used for EPDCCH can use some or all of the four antenna ports (antenna ports 107-110). Furthermore, the DL-DMRS can change the CDM spreading code length or the number of resource elements to be mapped according to the rank of the associated channel.

[0212] DL-DMRS for PDSCH transmitted via antenna ports 7, 8, 11, and 13 are mapped to resource elements indicated by D1. DL-DMRS for PDSCH transmitted via antenna ports 9, 10, 12, and 14 are mapped to resource elements indicated by D2. Furthermore, DL-DMRS for EPDCCH transmitted via antenna ports 107 and 108 are mapped to resource elements indicated by D1. DL-DMRS for EPDCCH transmitted via antenna ports 109 and 110 are mapped to resource elements indicated by D2.

[0213] <HARQ in this embodiment>

[0214] In this embodiment, HARQ has various features. HARQ transmits and retransmits transport blocks. In HARQ, a predetermined number of processes (HARQ processes) are used, and each process works independently in a stop-and-wait manner.

[0215] In the downlink, HARQ operates asynchronously and adaptively. In other words, in the downlink, retransmissions are continuously scheduled via the PDCCH. The uplink HARQ-ACK (response information) corresponding to the downlink transmission is transmitted via PUCCH or PUSCH. In the downlink, the PDCCH indicates the HARQ process number and whether the transmission is an initial transmission or a retransmission.

[0216] In the uplink, HARQ operates synchronously or asynchronously. The downlink HARQ-ACK (response information) corresponding to the uplink transmission is transmitted via PHICH. In uplink HARQ, the terminal device's operation is determined by the HARQ feedback and / or the PDCCH received by the terminal device. For example, if no PDCCH is received and the HARQ feedback is ACK, the terminal device does not retransmit but keeps the data in the HARQ buffer. In this case, the PDCCH can be transmitted to restart the retransmission. Furthermore, for example, if no PDCCH is received and the HARQ feedback is NACK, the terminal device performs a non-adaptive retransmission via a predetermined uplink subframe. Additionally, for example, if a PDCCH is received, the terminal device performs transmission or retransmission based on the content notified via the PDCCH, regardless of the content of the HARQ feedback.

[0217] Furthermore, in the uplink, under predetermined conditions (settings), HARQ can operate asynchronously only. In other words, without transmitting downlink HARQ-ACK, uplink retransmissions can be continuously scheduled via PDCCH.

[0218] In a HARQ-ACK report, HARQ-ACK indicates ACK, NACK, or DTX. When HARQ-ACK is ACK, it indicates that the transport block (codeword and channel) corresponding to the HARQ-ACK was correctly received (decoded). When HARQ-ACK is NACK, it indicates that the transport block (codeword and channel) corresponding to the HARQ-ACK was not correctly received (decoded). When HARQ-ACK is DTX, it indicates that the transport block (codeword and channel) corresponding to the HARQ-ACK did not exist (was not transmitted).

[0219] In each of the downlink and uplink, a predetermined number of HARQ processes are set (specified). For example, in FDD, up to 8 HARQ processes are used for each serving cell. Furthermore, for example, in TDD, the maximum number of HARQ processes is determined based on the uplink / downlink configuration. The maximum number of HARQ processes can be determined based on the round-trip time (RTT). With an RTT of 8 TTIs, the maximum number of HARQ processes can be 8.

[0220] In this embodiment, the HARQ information consists of at least a New Data Indicator (NDI) and a Transport Block Size (TBS). The NDI indicates whether the transport block corresponding to the HARQ information is an initial transmission or a retransmission. The TBS is the transport block size. A transport block is a block of data in the transmission channel (transmit layer) and can be a unit used for HARQ. In DL-SCH transmission, the HARQ information also includes a HARQ process ID (HARQ process number). In UL-SCH transmission, the HARQ information also includes the information bits encoded in the transport block and a redundant version (RV) of the information as a parity bit. In the case of spatial multiplexing in DL-SCH, the HARQ information for each transport block includes a set of NDI and TBS.

[0221] <TTI in this embodiment>

[0222] Figure 6 This is a diagram illustrating an example of TTI in this embodiment. Figure 6 In the example, TTI is 1 subframe. In other words, the unit of data transmission in the time domain, such as PDSCH, PUSCH, or HARQ-ACK, is 1 subframe. The arrows between downlink and uplink indicate HARQ timing and / or scheduling timing. HARQ timing and scheduling timing are specified or set in units of subframes that constitute TTI. For example, if a specific PDSCH is transmitted via downlink subframe n, the HARQ-ACK for that PDSCH is transmitted via uplink subframe n+4, four subframes later. For example, if a PDCCH for notifying uplink grant is transmitted via downlink subframe n, the PUSCH corresponding to the uplink grant is transmitted via uplink subframe n+4, four subframes later, and the HARQ-ACK for that PUSCH is notified via downlink subframe n+8, four subframes later. Furthermore, in Figure 6 The example shown illustrates a TTI of one subframe; however, a TTI can consist of multiple subframes. In other words, a TTI can be an integer multiple of the subframe length.

[0223] Figure 7 This is a diagram illustrating an example of TTI in this embodiment. Figure 7 In the example, TTI is 1 symbol. In other words, the unit of data transmission in the time domain, such as PDSCH, PUSCH, or HARQ-ACK, is 1 symbol. The arrow between the downlink and uplink indicates HARQ timing and / or scheduling timing. HARQ timing and scheduling timing are specified or set in units of symbols as TTI. For example, if a specific PDSCH is transmitted via downlink symbol n, the HARQ-ACK for that PDSCH is transmitted via uplink symbol n+4, 4 symbols later. For example, if a PDCCH for notifying uplink grant is transmitted via downlink symbol n, the PUSCH corresponding to the uplink grant is transmitted via uplink symbol n+4, 4 symbols later, and the HARQ-ACK for that PUSCH is notified via downlink symbol n+8, 4 symbols later. Furthermore, in Figure 7 The example shown illustrates a TTI of 1 symbol; however, a TTI can have multiple symbols. In other words, a TTI can be an integer multiple of the symbol length.

[0224] Figure 6 and Figure 7 The difference lies in the different sizes (lengths) of the TTIs. Furthermore, as mentioned above, when HARQ timing and scheduling timing are specified or set according to the TTI, reducing the TTI allows the HARQ timing and scheduling timing to be adjusted to earlier timings. Since HARQ timing and scheduling timing are factors determining the system's latency, reducing the TTI reduces latency. For example, reducing latency is important for data (packets) used for security purposes (such as intelligent transportation systems). On the other hand, when the TTI is reduced, the maximum value of the TBS transmitted in one TTI is reduced, potentially increasing the overhead of control information. Therefore, it is preferable to specify or set the TTI according to the purpose or use of the data. For example, base station equipment can specify or set the size (length) and / or mode of the TTI in a cell-specific or terminal-specific manner. Furthermore, when HARQ timing and scheduling timing are specified or set according to the TTI, changing the size (length) of the TTI allows for adaptive setting of the latency and / or the maximum value of the TBS transmitted in one TTI. Thus, efficient data transmission taking latency into account can be performed. Furthermore, in the description of this embodiment, subframes, symbols, OFDM symbols, and SC-FDMA symbols can be interpreted as TTI.

[0225] <TTI-related settings in this embodiment>

[0226] In this embodiment, multiple TTI sizes are defined. For example, multiple modes (TTI modes) related to the TTI size are defined, and the base station equipment sets the modes in the terminal equipment through upper-layer signaling. The base station equipment performs data transmission according to the TTI mode set in the terminal equipment. The terminal equipment performs data transmission according to the TTI mode set by the base station equipment. The TTI mode can be set individually for each cell (serving cell).

[0227] The first TTI mode is a subframe-based TTI mode, and the second TTI mode is a symbol-based TTI mode. For example, Figure 6 The TTI example shown is used in the first TTI mode. Figure 7 The TTI illustrated is used in the second TTI mode. Furthermore, for example, in the first TTI mode, the TTI is an integer multiple of the subframe length, while in the second TTI mode, the TTI is an integer multiple of the symbol length. Additionally, for example, in the first TTI mode, the TTI is defined by a single subframe used in prior art systems, while in the second TTI mode, the TTI is defined as an integer multiple of the symbol length not used in prior art systems. Furthermore, the TTI defined or set in the first TTI mode is also referred to as the first TTI, and the TTI defined or set in the second TTI mode is also referred to as the second TTI.

[0228] Various methods can be used to configure TTI modes. In one example of TTI mode configuration, a first TTI mode or a second TTI mode is configured in the terminal device via upper-layer signaling. When the first TTI mode is configured, data transmission occurs according to the first TTI. When the second TTI mode is configured, data transmission occurs according to the second TTI. In another example of TTI mode configuration, a second TTI mode (extended TTI mode or short TTI (STTI) mode) is configured in the terminal device via upper-layer signaling. When the second TTI mode is not configured, data transmission occurs according to the first TTI. When the second TTI mode is configured, data transmission occurs according to the second TTI. Furthermore, the second TTI is also referred to as extended TTI or STTI.

[0229] STTI-related settings (STTI configuration) are performed via RRC signaling and / or physical layer signaling. STTI configuration includes information (parameters) related to the TTI size, STTI-related settings in the downlink (downlink STTI configuration), STTI-related settings in the uplink (uplink STTI configuration), and / or information used to monitor control channels that provide control information related to STTI. STTI settings can be configured individually for each cell (serving cell).

[0230] The settings related to STTI in the downlink are the settings for transmission (transmission and reception) of downlink channels (PDSCH, PDCCH, and / or EPDCCH) in STTI mode, including settings related to downlink channels in STTI mode. For example, settings related to STTI in the downlink include settings related to PDSCH in STTI mode, settings related to PDCCH in STTI mode, and / or settings related to EPDCCH in STTI mode.

[0231] The settings related to STTI in the uplink are the settings for transmission (transmission and reception) of the uplink channels (PUSCH and / or PUCCH) in STTI mode, including settings related to the uplink channels in STTI mode. For example, settings related to STTI in the uplink include settings related to PUSCH in STTI mode, and / or settings related to PUCCH in STTI mode.

[0232] The information used to monitor the control channel for notifying control information related to STTI is the RNTI used to scramble the CRC added to the STTI-related control information (DCI). This RNTI is also referred to as the STTI-RNTI. Furthermore, the STTI-RNTI can be set commonly for both downlink and uplink STTIs, or it can be set independently. Additionally, in the case of multiple STTI settings, the STTI-RNTI can be set commonly for all STTI settings, or it can be set independently.

[0233] Information related to the TTI size indicates the size of the TTI in STTI mode (i.e., the STTI size). For example, information related to the TTI size includes the number of OFDM symbols in the TTI, defined in units of OFDM symbols. Furthermore, if information related to the TTI size is not included in the STTI settings, the TTI size can be set to a predefined value. For example, if information related to the TTI size is not included in the STTI settings, the TTI size may be 1 symbol length or 1 subframe length. Additionally, information related to the TTI size can be set commonly for both downlink and uplink STTI settings, or it can be set independently. Furthermore, if multiple STTI settings are configured, the information related to the TTI size can be set commonly for all STTI settings, or it can be set independently.

[0234] In this embodiment, the channel in STTI mode (STTI channel) includes the downlink channel in STTI mode and / or the uplink channel in STTI mode. Settings related to the channel in STTI mode (STTI channel settings) include settings related to the downlink channel in STTI mode and / or settings related to the uplink channel in STTI mode. The PDSCH in STTI mode is also referred to as Short PDSCH (SPDSCH), Enhanced PDSCH (EPDSCH), or Simplified PDSCH (RPDSCH). The PUSCH in STTI mode is also referred to as Short PUSCH (SPUSCH), Enhanced PUSCH (EPUSCH), or Simplified PUSCH (RPUSCH). The PUCCH in STTI mode is also referred to as Short PUCCH (SPUCCH), Enhanced PUCCH (EPUCCH), or Simplified PUCCH (RPUCCH). The STTI channel includes SPDSCH, SPUSCH, or SPUCCH. The STTI channel settings include SPDSCH settings, SPUSCH settings, or SPUCCH settings.

[0235] In this embodiment, various methods or approaches can be used for data transmission and scheduling of channels in STTI mode. For example, channels in STTI mode are mapped to some or all of one or more periodic resources set or notified through upper-layer signaling and / or physical-layer signaling.

[0236] In STTI mode, channels are mapped according to sub-resource blocks. Sub-resource blocks indicate the mapping from a predetermined channel to a resource element in STTI mode. A sub-resource block is defined by consecutive subcarriers corresponding to one TTI in the time domain and one resource block in the frequency domain. A particular sub-resource block can be configured to be contained within only one resource block, or it can span two resource blocks. Furthermore, a particular sub-resource block can span two resource blocks within a single resource block pair, or it cannot span multiple resource block pairs.

[0237] In STTI mode, each transport block (codeword) of the channel is transmitted using one or more sub-resource blocks within the same TTI.

[0238] In terminal equipment, resources (sub-resource blocks) to which a channel in STTI mode (STTI channel) can be mapped are defined through upper-layer signaling and / or physical-layer signaling. The resources to which a channel in STTI mode can be mapped are also called candidate STTI channels. Furthermore, a series of candidate STTI channels defined using one STTI channel is also called a set of candidate STTI channels.

[0239] The set of candidate STTI channels is specified using a predetermined TTI period in the time domain and a predetermined sub-resource block in the frequency domain. Multiple STTI channel settings can be performed within the same STTI channel. In other words, the period in the time domain and / or the resources in the frequency domain can be set independently within each set of candidate STTI channels. When multiple STTI channel settings are performed, the terminal device can monitor the set of multiple candidate STTI channels.

[0240] STTI channel configuration includes STTI channel configuration information in the time domain, STTI channel configuration information in the frequency domain, and / or information related to HARQ-ACK for the STTI channel. Additionally, STTI channel configuration may include information for monitoring control channels used to notify information related to the TTI size and / or control information related to the STTI channel. The time-domain STTI channel configuration information is used to determine the resources of candidate STTI channels in the time domain. The frequency-domain STTI channel configuration information is used to determine the resources of candidate STTI channels in the frequency domain.

[0241] Information used to determine the resources of candidate STTI channels can be in various formats. The resources of STTI channels in the frequency domain are determined (set, specified, or designated) on a resource block or sub-resource block basis.

[0242] Examples of STTI channel configuration information in the time domain include a predetermined number of TTI periods and a predetermined number of TTI offsets. The TTI offset is the offset (shift) from the reference TTI and is set in units of TTIs. For example, with a TTI offset of 3, a set of candidate STTI channels is configured by including TTIs obtained by offsetting 3 TTIs from the reference TTI. For example, with a TTI period of 3, the set of candidate STTI channels is configured every 2 TTIs. With a TTI period of 1, all consecutive TTIs are configured.

[0243] In another example of STTI channel setting information in the time domain, bitmap information indicating the TTI of a candidate STTI channel is used. For example, one bit in the bitmap information corresponds to a predetermined number of subframes, or individual TTIs within a predetermined number of radio frames. When a specific bit in the bitmap information is 1, it indicates that the TTI corresponding to that bit is a TTI that includes a candidate STTI channel. When a specific bit in the bitmap information is 0, it indicates that the TTI corresponding to that bit is not a TTI that includes a candidate STTI channel. Specifically, when the TTI size is one subframe, the number of TTIs in five subframes is 70. In this case, the bitmap information is 70 bits. The bitmap information is applied starting with the TTI that serves as a reference, and is repeatedly applied to each TTI corresponding to that bitmap information.

[0244] An example of STTI channel configuration information in the frequency domain utilizes bitmap information indicating sub-resource blocks or sets of sub-resource blocks that are candidate STTI channels. For example, one bit in the bitmap information corresponds to each of a predetermined number of sub-resource blocks in the set. When a specific bit in the bitmap information is 1, it indicates that the sub-resource block included in the set of sub-resource blocks corresponding to that bit is a sub-resource block that includes a candidate STTI channel. When a specific bit in the bitmap information is 0, it indicates that the sub-resource block included in the set of sub-resource blocks corresponding to that bit is not a sub-resource block that includes a candidate STTI channel.

[0245] Another example of STTI channel setting information in the frequency domain is the sub-resource block as the starting point, and the number of consecutively allocated sub-resource blocks.

[0246] In the frequency domain, the set of sub-resource blocks consists of a predetermined number of consecutive sub-resource blocks. The predetermined number of sub-resource blocks constituting the set can be determined based on other parameters such as system bandwidth, or can be set via RRC signaling. In this embodiment, the set of sub-resource blocks simply includes sub-resource blocks.

[0247] The sub-resource blocks set by the STTI channel setting information in the frequency domain can be the same across all TTIs, or they can be switched (jumped) every predetermined number of TTIs. For example, the sub-resource blocks of candidate STTI channels in a particular TTI can be determined by further utilizing the number (index or information) indicating a specific TTI, and the sub-resource blocks of candidate STTI channels are set differently for each TTI. Thus, frequency diversity effects can be expected.

[0248] Information related to HARQ-ACK for STTI channels includes information related to the resources used to report HARQ-ACK for STTI channels. For example, in the case of an SPDSCH STTI channel, the information related to HARQ-ACK for STTI channels explicitly or implicitly indicates the resources in the uplink channel used to report HARQ-ACK for SPDSCH.

[0249] When setting multiple STTI channel settings for the same STTI channel, all parameters in the STTI channel settings can be set independently, or some parameters can be set commonly. For example, in multiple STTI channel settings, the STTI channel setting information in the time domain and the STTI channel setting information in the frequency domain can be set independently. Alternatively, the STTI channel setting information in the time domain can be set commonly, while the STTI channel setting information in the frequency domain can be set independently. Furthermore, only some information can be set commonly, and the TTI period included in the STTI channel setting information in the time domain can be set commonly.

[0250] Information or parameters set using the STTI settings in this embodiment can be communicated via physical layer signaling. For example, STTI channel setting information in the frequency domain is communicated via physical layer signaling.

[0251] In one example of STTI mode terminal device operation, the terminal device operates solely through upper-layer signaling (RRC signaling). When the STTI channel setting is configured via upper-layer signaling, the terminal device begins monitoring or receiving data on the corresponding STTI channel. When the STTI channel setting is deconfigured via upper-layer signaling, the terminal device ceases monitoring or receiving data on the corresponding STTI channel.

[0252] In another example of STTI mode terminal device operation, the terminal device operates via upper-layer signaling (RRC signaling) and physical-layer signaling. When the STTI channel configuration is set via upper-layer signaling, and the Dispatch Information (DCI) for initiating the corresponding STTI channel is notified via physical-layer signaling, the terminal device begins monitoring or receiving the corresponding STTI channel. When the STTI channel configuration is set via upper-layer signaling, and the Dispatch Information (DCI) for de-scheduling the corresponding STTI channel is notified via physical-layer signaling, the terminal device stops monitoring or receiving the corresponding STTI channel.

[0253] When multiple STTI channel settings are configured, the information for initiating or de-scheduling STTI channels can be communicated publicly to all STTI channels or can be communicated independently.

[0254] When multiple STTI channel settings are configured, and the candidate STTI channels configured differently conflict at the same TTI (i.e., multiple candidate STTI channels are configured within the same TTI), the terminal device can monitor all candidate STTI channels, or it can monitor some candidate STTI channels. When monitoring some candidate STTI channels, the terminal device can determine which candidate STTI channels to monitor based on a predetermined priority. For example, the predetermined priority is determined based on the type of STTI channel, the index (number) indicating the STTI channel configuration, and / or elements (parameters) including the capabilities of the terminal device.

[0255] <Details of SPDSCH in this embodiment>

[0256] Figure 8 This is a diagram illustrating an example of a set of candidate SPDSCHs. Figure 8 In the example, the base station equipment of the terminal device sets a first set and a second set of candidate SPDSCHs. The TTI size is 1 symbol. In the first set of candidate SPDSCHs, the TTI period is 2, and the TTI offset is 0. Here, the TTI in the reference that serves as the TTI offset is... Figure 8 The first symbol in the sequence is 0. In the second set of candidate SPDSCH, the period of TTI is 3, and the offset of TTI is 1.

[0257] The base station equipment maps the SPDSCH for the terminal equipment to one of the candidate SPDSCHs set in the terminal equipment, and transmits the resulting data. The terminal equipment monitors the candidate SPDSCHs set in the base station equipment and detects the SPDSCH for that terminal equipment.

[0258] An example of a method for determining whether an SPDSCH detected in a particular terminal device is intended for that terminal device and for correctly receiving it is to utilize a terminal device-specific RNTI (e.g., STTI-RNTI). For example, using a terminal device-specific RNTI, each codeword (transmission block) is scrambled with a predetermined CRC and then transmitted. Thus, when the terminal device receives the SPDSCH, since each codeword is correctly descrambled, the terminal device can determine, based on the added CRC, that the SPDSCH was intended for it. Conversely, if a different terminal device receives the SPDSCH, since each codeword is not correctly descrambled, the other terminal device can determine, based on the added CRC, that the SPDSCH was not intended for it.

[0259] Another example of a method for determining whether an SPDSCH detected in a particular terminal device is intended for that terminal device and for correctly receiving it is a method that includes information indicating that the SPDSCH for that particular terminal device is intended for that terminal device. For example, the SPDSCH for that particular terminal device contains an RNTI specific to that terminal device. For instance, the CRC in the SPDSCH for that terminal device is scrambled using the RNTI specific to that terminal device.

[0260] The terminal device performs operations related to reporting HARQ-ACK for the SPDSCH or candidate SPDSCH, depending on whether the SPDSCH delivered to the terminal device has been correctly received (decoded).

[0261] Here, in a specific terminal device, if the candidate SPDSCH is not correctly received (decoded), the candidate SPDSCH may be one of the following:

[0262] (1) The SPDSCH was delivered to the terminal device, but was not received correctly;

[0263] (2) The SPDSCH is a SPDSCH delivered to a terminal device that is different from the terminal device;

[0264] (3) No SPDSCH is transmitted to the candidate PDSCH. However, if the candidate SPDSCH is not received correctly, the terminal device cannot determine whether the SPDSCH corresponds to one of the above situations. Therefore, if the SPDSCH is not received correctly by the terminal device, it is preferable to perform the same operation regardless of whether the SPDSCH corresponds to one of the above situations.

[0265] Examples of operations related to HARQ-ACK reporting for SPDSCH or candidate SPDSCH in the terminal device are as follows:

[0266] (1) If the terminal device is able to correctly receive (decode) the SPDSCH delivered to the terminal device, the terminal device reports the SPDSCH as a HARQ-ACK report through a predetermined resource report ACK.

[0267] (2) If the terminal device fails to properly receive (decode) the SPDSCH delivered to the terminal device, the terminal device reports NACK and / or DTX via a predefined resource as a HARQ-ACK report for the SPDSCH.

[0268] Figure 9 This diagram illustrates an example of SPDSCH transmission in base station equipment and HARQ-ACK reporting in terminal equipment. The base station equipment configures a set of candidate SPDSCHs in the terminal equipment via RRC signaling using STTI. The base station equipment notifies the terminal equipment of scheduling information for initiating SPDSCH transmission via PDCCH. The base station equipment may transmit SPDSCHs to the terminal equipment based on the configured set of candidate SPDSCHs. Meanwhile, the terminal equipment monitors the configured set of candidate SPDSCHs and detects SPDSCHs specific to the terminal equipment.

[0269] The base station equipment transmits SPDSCHs for the terminal equipment in candidate SPDSCHs #1, #2, #3, and #5. Since the SPDSCHs in candidate SPDSCHs #1, #2, and #5 are correctly decoded, the terminal equipment reports HARQ-ACKs indicating ACK in HARQ-ACK reports #1, #2, and #5. Since the SPDSCH in candidate SPDSCH #3 is not correctly decoded, the terminal equipment reports a HARQ-ACK indicating NACK and / or DTX in HARQ-ACK report #3.

[0270] The base station equipment transmits the SPDSCH for other terminal devices in candidate SPDSCH #4 and #6. Alternatively, the base station equipment may not transmit anything outside of candidate SPDSCH #4 and #6. Since the SPDSCH in candidate SPDSCH #4 and #6 is correctly decoded, the terminal device reports a HARQ-ACK indicating NACK and / or DTX in HARQ-ACK reports #4 and #6.

[0271] The base station equipment notifies the terminal equipment of the information used to cancel the scheduling of SPDSCH via PDCCH. The terminal equipment then stops monitoring the set of candidate SPDSCHs.

[0272] By utilizing the above method, it is unnecessary to separately notify the control information used for scheduling SPDSCH, thereby reducing the overhead of the control information and reducing waiting time. Furthermore, the terminal device performs HARQ-ACK for all candidate SPDSCHs, thus recognizing that the terminal device is monitoring candidate SPDSCHs even if the base station device does not transmit SPDSCHs for that terminal device.

[0273] In the above method, when the same set of candidate SPDSCHs is set across multiple terminal devices, the resources used for HARQ-ACK reporting are configured differently among the terminal devices. Therefore, the transmission efficiency for SPDSCHs can be improved, and the reduction in transmission efficiency caused by HARQ-ACK report collisions can be reduced.

[0274] Other examples of operations related to HARQ-ACK reporting for SPDSCH or candidate SPDSCH in a terminal device are as follows: (1) If the terminal device can correctly receive (decode) the SPDSCH delivered to it, the terminal device reports an ACK as a HARQ-ACK report for the SPDSCH via a predetermined resource. The HARQ-ACK report indicating an ACK may explicitly or implicitly contain information indicating that this is a report from the terminal device. (2) If the terminal device does not correctly receive (decode) the SPDSCH delivered to it, the terminal device does not report a HARQ-ACK for the SPDSCH. In other words, the terminal device does not transmit anything via the predetermined resource for reporting a HARQ-ACK for the SPDSCH.

[0275] Figure 10 This diagram illustrates an example of SPDSCH transmission in base station equipment and HARQ-ACK reporting in terminal equipment. The base station equipment configures a set of candidate SPDSCHs in the terminal equipment via RRC signaling using STTI. The base station equipment then notifies the terminal equipment of scheduling information for initiating SPDSCH transmission via PDCCH. The base station equipment may transmit SPDSCHs to the terminal equipment based on the configured set of candidate SPDSCHs. Conversely, the terminal equipment monitors the configured set of candidate SPDSCHs and detects SPDSCHs relevant to the terminal equipment.

[0276] The base station equipment transmits the SPDSCH for the terminal equipment in candidate SPDSCH #1, #2, #3, and #5. Since the SPDSCHs in candidate SPDSCH #1, #2, and #5 are correctly decoded, the terminal equipment reports a HARQ-ACK indicating ACK in HARQ-ACK reports #1, #2, and #5. Since the SPDSCH in candidate SPDSCH #3 is not correctly decoded, the terminal equipment does not report a HARQ-ACK in HARQ-ACK report #3 and does not transmit anything.

[0277] The base station equipment transmits the SPDSCH for other terminal devices in candidate SPDSCH #4 and #6. Alternatively, the base station equipment may not transmit anything in candidate SPDSCH #4 and #6. Since the SPDSCH in candidate SPDSCH #4 and #6 is correctly decoded, the terminal device does not report HARQ-ACK in HARQ-ACK reports #4 and #6, and does not transmit anything.

[0278] The base station equipment notifies the terminal equipment of the information used to cancel the scheduling of SPDSCH via PDCCH. The terminal equipment then stops monitoring the set of candidate SPDSCHs.

[0279] Figure 11 This is a flowchart illustrating the process of setting STTI settings for the terminal device. Figure 11 Flowchart illustrations for use Figure 10 The terminal device operates according to the method described herein. In step S1, the terminal device monitors a PDCCH containing scheduling information for initiating an SPDSCH. If a PDCCH for initiation is detected, the process proceeds to step S2. If no PDCCH for initiation is detected, the process returns to step S1. In step S2, the terminal device monitors a PDCCH containing scheduling information for de-scheduling an SPDSCH. If a PDCCH for de-scheduling is detected, the process terminates. If no PDCCH for de-scheduling is detected, the process proceeds to step S3. In step S3, the terminal device monitors candidate SPDSCHs according to the upper-layer STTI settings. In step S4, the terminal device detects the SPDSCH delivered to it from the candidate SPDSCHs. If the SPDSCH delivered to the terminal device is correctly decoded, the process proceeds to step S5. If the SPDSCH delivered to the terminal device is not correctly decoded, the process returns to step S2. In step S5, for a correctly decoded SPDSCH, the terminal device reports a HARQ-ACK indicating an ACK.

[0280] Figure 12This is a diagram illustrating an example of how base station equipment and terminal equipment operate when multiple terminal devices are making settings related to the same SPDSCH. Figure 12 In the example, base station equipment and terminal equipment are used in Figure 10 The method described in the document. In other words, the terminal device performs... Figure 11 The operation is illustrated in the flowchart.

[0281] At timing #1 of the candidate SPDSCH, the base station device transmits the SPDSCH to terminal device A. Since the SPDSCH delivered to terminal device A is correctly decoded, terminal device A reports a HARQ-ACK indicating ACK for that SPDSCH. Because terminal devices B and C do not correctly decode the candidate SPDSCH, they do not report a HARQ-ACK for that candidate SPDSCH. Based on the HARQ-ACK report from terminal device A, the base station device recognizes that the SPDSCH has been correctly decoded.

[0282] At timing #2 of the candidate SPDSCH, the base station device transmits the SPDSCH to terminal device C. Since the SPDSCH delivered to terminal device C is correctly decoded, terminal device C reports a HARQ-ACK indicating ACK for that SPDSCH. Because terminal devices A and B do not correctly decode the candidate SPDSCH, they do not report a HARQ-ACK for that candidate SPDSCH. Based on the HARQ-ACK report from terminal device C, the base station device recognizes that the SPDSCH has been correctly decoded.

[0283] At time #3 of the candidate SPDSCH, the base station equipment transmits nothing. Because terminal devices A, B, and C have not correctly decoded the candidate SPDSCH, they do not report a HARQ-ACK for that candidate SPDSCH.

[0284] At timing #4 of the candidate SPDSCH, the base station equipment transmits the SPDSCH to terminal equipment B. Because terminal equipment A, B, and C have not correctly decoded the candidate SPDSCH, they do not report a HARQ-ACK for that candidate SPDSCH. Since the HARQ-ACK for the candidate SPDSCH is not reported, the base station equipment recognizes that terminal equipment B has not correctly decoded the SPDSCH.

[0285] By utilizing the above method, it is unnecessary to separately notify the control information used for scheduling SPDSCH, thereby reducing the overhead of the control information and decreasing the waiting time. Furthermore, the terminal device only performs HARQ-ACK if the candidate SPDSCH is correctly decoded, thus reducing the processing and power consumption of the terminal device.

[0286] In the above method, when the same set of candidate SPDSCHs is set across multiple terminal devices, the resources used for HARQ-ACK reporting are configured differently among the terminal devices. Therefore, the transmission efficiency for SPDSCHs can be improved, the resources used for HARQ-ACK reporting can be reduced, and the uplink transmission efficiency can be improved.

[0287] <Details of PDSCH and SPDSCH in this embodiment>

[0288] For example, if SPDSCH is configured in a specific serving cell, the terminal device processes SPDSCH within that serving cell. Conversely, if SPDSCH is not configured in a specific serving cell, the terminal device processes PDSCH within that serving cell. Below are examples illustrating the differences between PDSCH and SPDSCH.

[0289] One example of the difference between PDSCH and SPDSCH is the TTI size.

[0290] PDSCH is the downlink shared channel in the first TTI mode, which is transmitted according to the TTI defined by a subframe used in existing systems.

[0291] SPDSCH is the downlink shared channel under the second TTI mode (STTI mode), which is transmitted according to a TTI specified or set by an integer multiple of the symbol length not used in existing systems.

[0292] One example of the difference between PDSCH and SPDSCH is the scheduling method.

[0293] PDSCHs can be scheduled via DCI notified by PDCCHs detected in the same TTI. Specifically, the TTI to which a PDSCH is mapped is the TTI in which the corresponding PDCCH is detected. The resource blocks in the frequency domain to which the PDSCH is mapped are scheduled via DCI. In other words, a PDCCH used to schedule a specific PDSCH only schedules that PDSCH.

[0294] SPDSCH cannot be scheduled via DCI notified by a control channel or PDCCH detected in the same TTI. The TTI to which SPDSCH can be mapped is a predetermined TTI set by RRC signaling. The sub-resource blocks in the frequency domain to which SPDSCH can be mapped can be set and / or notified via DCI used to initiate RRC signaling and / or SPDSCH scheduling. In other words, SPDSCH is scheduled using one or more candidate SPDSCHs set by DCI used to initiate RRC signaling and SPDSCH scheduling.

[0295] One example of the difference between PDSCH and SPDSCH is the receiving processing of terminal devices.

[0296] In the first TTI mode, the PDSCH received by a specific terminal device is the PDSCH specific to that terminal device. Therefore, the terminal device sends a HARQ-ACK report for the PDSCH scheduled for that terminal device, regardless of the result of decoding the PDSCH.

[0297] In the second TTI mode, the SPDSCH (candidate SPDSCH) received by a specific terminal device is unlikely to be the PDSCH for that terminal device. Therefore, the terminal device reports a HARQ-ACK for the PDSCH scheduled for that terminal device based on the result of decoding the PDSCH. For example, if the result of decoding the PDSCH is ACK, the terminal device reports a HARQ-ACK for the PDSCH scheduled for that terminal device. If the result of decoding the PDSCH is NACK, the terminal device does not report a HARQ-ACK for the PDSCH scheduled for that terminal device.

[0298] According to the details of the above embodiments, in a wireless communication system in which base station device 1 and terminal device 2 communicate with each other, transmission efficiency can be improved.

[0299] <Application Example>

[0300] [Application examples of base stations]

[0301] (First application example)

[0302] Figure 13 This is a block diagram illustrating a first example of the schematic configuration of an eNB to which the technology of this disclosure is applicable. The eNB 800 includes one or more antennas 810 and a base station device 820. The antennas 810 and the base station device 820 can be interconnected via RF cables.

[0303] Each antenna 810 includes one or more antenna elements (e.g., multiple antenna elements constituting a MIMO antenna) for use by the base station equipment 820 to transmit and receive wireless signals. The eNB 800 may include multiple antennas 810, such as... Figure 13 As shown in the diagram, the plurality of antennas 810 may, for example, correspond to multiple frequency bands used by the eNB 800. It should be noted that although... Figure 13 The illustration shows an example where the eNB 800 includes multiple antennas 810; however, the eNB 800 may also include a single antenna 810.

[0304] The base station equipment 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.

[0305] The controller 821, such as a CPU or DSP, runs various functions at the upper layer of the base station equipment 820. For example, the controller 821 generates data packets from data processed by the wireless communication interface 825 and transmits the generated packets via the network interface 823. The controller 821 can generate packetized packets by packaging data from multiple baseband processors for transmission. Furthermore, the controller 821 may also have logical functions for performing controls such as radio resource control, radio bearer control, mobility management, admission control, and scheduling. Moreover, the control can be performed in coordination with nearby eNBs or core network nodes. The memory 822 includes RAM and ROM, storing programs executed by the controller 821, as well as various control data (such as terminal lists, transmit power data, and scheduling data).

[0306] Network interface 823 is the communication interface connecting base station equipment 820 and core network 824. Controller 821 can communicate with core network nodes or other eNBs through network interface 823. In this case, eNB 800 can connect to core network nodes or other eNBs through a logical interface (e.g., S1 interface or X2 interface). Network interface 823 can be a wired communication interface or a wireless communication interface for wireless backhaul. When network interface 823 is a wireless communication interface, it can use a higher frequency band than that used by wireless communication interface 825 for wireless communication.

[0307] The wireless communication interface 825 supports cellular communication methods such as LTE or LTE-Advanced, providing wireless connectivity with terminals located within the cell of the eNB 800 via antenna 810. The wireless communication interface 825 typically includes a baseband (BB) processor 826, RF circuitry 827, etc. The BB processor 826 performs functions such as encoding / decoding, modulation / demodulation, multiplexing / demultiplexing, and various signal processing at each layer (e.g., L1, Media Access Control (MAC), Radio Link Control (RLC), and Packet Data Convergence Protocol (PDCP)). The BB processor 826 can replace the controller 821 and has some or all of the aforementioned logical functions. The BB processor 826 can be a module including a memory storing a communication control program, a processor executing the program, and related circuitry; the functionality of the BB processor 826 can be modifiable by updating the program. Furthermore, the module can be a card or blade inserted into a slot in the base station equipment 820, or a chip mounted on the card or blade. Meanwhile, the RF circuit 827 may include a mixer, filter, amplifier, etc., and transmits and receives wireless signals through the antenna 810.

[0308] The wireless communication interface 825 may include multiple BB processors 826, such as Figure 13 As shown in the diagram, the plurality of BB processors 826 may correspond to, for example, multiple frequency bands used by the eNB 800. Furthermore, the wireless communication interface 825 may also include multiple RF circuits 827, such as... Figure 13 As shown in the diagram, the plurality of RF circuits 827 may correspond, for example, to a plurality of antenna elements. Note that... Figure 13 The illustration shows an example in which the wireless communication interface 825 includes multiple BB processors 826 and multiple RF circuits 827; however, the wireless communication interface 825 may include a single BB processor 826 or a single RF circuit 827.

[0309] (Second Application Example)

[0310] Figure 14 This is a block diagram illustrating a second example of the schematic configuration of an eNB to which the technology of this disclosure is applicable. The eNB 830 includes one or more antennas 840, a base station device 850, and an RRH 860. The antennas 840 and RRH 860 can be interconnected via RF cables. Alternatively, the base station device 850 and RRH 860 can be interconnected via high-speed lines such as optical fibers.

[0311] Each antenna 840 includes one or more antenna elements (e.g., antenna elements constituting a MIMO antenna) for the RRH860 to transmit and receive wireless signals. The eNB 830 may include multiple antennas 840, such as... Figure 14As shown in the diagram, the plurality of antennas 840 may correspond, for example, to multiple frequency bands used by the eNB 830. Note that... Figure 14 The illustration shows an example where the eNB 830 includes multiple antennas 840; however, the eNB 830 may also include a single antenna 840.

[0312] Base station equipment 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857. The controller 851, memory 852, and network interface 853 are connected to a reference... Figure 13 The controller 821, memory 822, and network interface 823 described are similar.

[0313] The wireless communication interface 855 supports cellular communication methods such as LTE and LTE-Advanced, providing wireless connectivity with terminals located in the sector corresponding to the RRH 860 via the RRH 860 and antenna 840. The wireless communication interface 855 typically includes a BB processor 856, etc. Besides the BB processor 856 being connected to the RF circuitry 864 of the RRH 860 via connection interface 857, the BB processor 856 and reference... Figure 13 The BB processor 826 described is similar. The wireless communication interface 855 may include multiple BB processors 856, such as... Figure 14 As shown in the diagram, the plurality of BB processors 856 may correspond, for example, to various frequency bands used by the eNB 830. Note that... Figure 14 The diagram illustrates an example where the wireless communication interface 855 includes multiple BB processors 856; however, the wireless communication interface 855 may also include a single BB processor 856.

[0314] Connection interface 857 is an interface used to connect base station equipment 850 (wireless communication interface 855) and RRH 860. Connection interface 857 can be a communication module used for communication on a high-speed line connecting base station equipment 850 (wireless communication interface 855) and RRH 860.

[0315] In addition, the RRH 860 includes a connectivity interface 861 and a wireless communication interface 863.

[0316] Connection interface 861 is an interface for connecting RRH 860 (wireless communication interface 863) and base station equipment 850. Connection interface 861 can be a communication module used for communication on high-speed lines.

[0317] The wireless communication interface 863 transmits and receives wireless signals via antenna 840. The wireless communication interface 863 typically includes RF circuitry 864, etc. RF circuitry 864 may include mixers, filters, amplifiers, etc., and transmits and receives wireless signals via antenna 840. The wireless communication interface 863 may include multiple RF circuits 864, such as... Figure 14 As shown in the diagram, the plurality of RF circuits 864 may correspond, for example, to a plurality of antenna elements. Note that... Figure 14 The illustration shows an example where the wireless communication interface 863 includes multiple RF circuits 864; however, the wireless communication interface 863 may also include a single RF circuit 864.

[0318] Figure 13 and 14 The eNB 800, eNB 830, base station equipment 820, or base station equipment 850 illustrated in the diagrams above correspond to the references above. Figure 3 Base station equipment 1, as described above.

[0319] [Application examples of terminal devices]

[0320] (First application example)

[0321] Figure 15 This is a block diagram illustrating an example of the schematic configuration of a smartphone 900, a terminal device 2 to which the technology of this disclosure is applicable. The smartphone 900 includes a processor 901, a memory 902, a storage device 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, one or more antenna switches 915, one or more antennas 916, a bus 917, a battery 918, and an auxiliary controller 919.

[0322] The processor 901 may be, for example, a CPU or a system-on-a-chip (SoC), which controls the functions of the application layer and other layers of the smartphone 900. The memory 902 includes RAM and ROM, storing programs executed by the processor 901, as well as data. The storage device 903 may include storage media such as semiconductor memory and hard disks. The external connection interface 904 is an interface for connecting the smartphone 900 to externally attached devices, such as memory cards and Universal Serial Bus (USB) devices.

[0323] Camera 906 includes, for example, an image sensor, such as a charge-coupled device (CCD) and complementary metal-oxide-semiconductor (CMOS), to generate captured images. Sensor 907 may include, for example, a sensor array including a positioning sensor, a gyroscope sensor, a geomagnetic sensor, an accelerometer, etc. Microphone 908 converts the sound input to smartphone 900 into an audio signal. Input device 909 includes, for example, a touch sensor that detects touch on the screen of display device 910, a keypad, a keyboard, buttons, switches, etc., to receive operation or information input from the user. Display device 910 includes a screen such as a liquid crystal display (LCD) and an organic light-emitting diode (OLED) display to display the output image of smartphone 900. Speaker 911 converts the audio signal output from smartphone 900 into sound.

[0324] The wireless communication interface 912 supports cellular communication methods such as LTE or LTE-Advanced for wireless communication. The wireless communication interface 912 typically includes a BB processor 913, RF circuitry 914, etc. The BB processor 913 can perform tasks such as encoding / decoding, modulation / demodulation, multiplexing / demultiplexing, and various signal processing for wireless communication. On the other hand, the RF circuitry 914 may include mixers, filters, amplifiers, etc., and transmits and receives wireless signals through an antenna 916. The wireless communication interface 912 can be a monolithic module integrating the BB processor 913 and the RF circuitry 914. The wireless communication interface 912 may include multiple BB processors 913 and multiple RF circuits 914, such as... Figure 15 As shown in the diagram. Note that... Figure 15 The illustration shows an example in which the wireless communication interface 912 includes multiple BB processors 913 and multiple RF circuits 914; however, the wireless communication interface 912 may include a single BB processor 913 or a single RF circuit 914.

[0325] In addition to cellular communication, wireless communication interface 912 can also support other types of wireless communication, such as short-range wireless communication, near-field communication and wireless local area network (LAN). In this case, wireless communication interface 912 may include BB processor 913 and RF circuit 914 for each wireless communication method.

[0326] Each antenna switch 915 switches the connection destination of the antenna 916 among multiple circuits (e.g., circuits for different wireless communication methods) included in the wireless communication interface 912.

[0327] Each antenna 916 includes one or more antenna elements (e.g., multiple antenna elements constituting a MIMO antenna), used by the wireless communication interface 912 for the transmission and reception of wireless signals. The smartphone 900 may include multiple antennas 916, such as... Figure 15 As shown in the diagram. Note that... Figure 15 The illustration shows an example of a smartphone 900 including multiple antennas 916; however, a smartphone 900 may include a single antenna 916.

[0328] Furthermore, the smartphone 900 may include an antenna 916 for each wireless communication method. In this case, the antenna switch 915 can be omitted from the configuration of the smartphone 900.

[0329] The bus 917 interconnects the processor 901, memory 902, storage device 903, external connection interface 904, camera 906, sensor 907, microphone 908, input device 909, display device 910, speaker 911, wireless communication interface 912, and auxiliary controller 919. The battery 918 supplies power to the processor 901 via a power line partially illustrated as dashed lines in the figure. Figure 15 The various components of the illustrated smartphone 900 are powered. The auxiliary controller 919, for example, operates the minimum necessary functions of the smartphone 900 in sleep mode.

[0330] (Second Application Example)

[0331] Figure 16 This is a block diagram illustrating an example of the schematic configuration of an in-vehicle navigation device 920 to which the technology of this disclosure is applicable. The in-vehicle navigation device 920 includes a processor 921, a memory 922, a Global Positioning System (GPS) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, a wireless communication interface 933, one or more antenna switches 936, one or more antennas 937, and a battery 938.

[0332] The processor 921 may be, for example, a CPU or a SoC, which controls the navigation functions and other functions of the in-vehicle navigation device 920. The memory 922 includes RAM and ROM, which store the programs executed by the processor 921, as well as data.

[0333] GPS module 924 uses GPS signals received from GPS satellites to measure the position (e.g., latitude, longitude, and altitude) of in-vehicle navigation device 920. Sensor 925 may include a sensor array, such as a gyroscope sensor, a geomagnetic sensor, a barometric pressure sensor, etc. Data interface 926 connects to in-vehicle network 941, for example via a terminal not shown, to obtain data generated on the vehicle side, such as vehicle speed data.

[0334] Content player 927 reproduces content stored on a storage medium (e.g., CD or DVD) in storage medium insertion interface 928. Input device 929 includes, for example, a touch sensor that detects touch on the screen of display device 930, buttons, switches, etc., and receives operation or information input from the user. Display device 930 includes a screen such as an LCD or OLED display, displaying images of navigation functions or reproduced content. Speaker 931 outputs sound from navigation functions or reproduced content.

[0335] The wireless communication interface 933 supports cellular communication methods such as LTE or LTE-Advanced for wireless communication. The wireless communication interface 933 typically includes a BB processor 934, RF circuitry 935, etc. The BB processor 934 performs tasks such as encoding / decoding, modulation / demodulation, multiplexing / demultiplexing, and various signal processing operations for wireless communication. On the other hand, the RF circuitry 935 may include mixers, filters, amplifiers, etc., and transmits and receives wireless signals via antenna 937. The wireless communication interface 933 can be a monolithic module integrating the BB processor 934 and RF circuitry 935. The wireless communication interface 933 may include multiple BB processors 934 and multiple RF circuits 935, such as... Figure 16 As shown in the diagram. Note that... Figure 16 The illustration shows an example where the wireless communication interface 933 includes multiple BB processors 934 and multiple RF circuits 935; however, the wireless communication interface 933 may include a single BB processor 934 or a single RF circuit 935.

[0336] In addition to cellular communication, the wireless communication interface 933 can also support other types of wireless communication, such as short-range wireless communication, near-field communication, and wireless LAN. In this case, the wireless communication interface 933 may include a BB processor 934 and an RF circuit 935 for each wireless communication method.

[0337] Each antenna switch 936 switches the connection destination of antenna 937 among multiple circuits (e.g., circuits for different wireless communication methods) included in wireless communication interface 933.

[0338] Each antenna 937 includes one or more antenna elements (e.g., multiple antenna elements constituting a MIMO antenna), used by a wireless communication interface 933 for the transmission and reception of wireless signals. The in-vehicle navigation device 920 may include multiple antennas 937, such as... Figure 16 As shown in the diagram. Note that... Figure 16 The illustration shows an example of an in-vehicle navigation device 920 including multiple antennas 937; however, the in-vehicle navigation device 920 may include a single antenna 937.

[0339] Furthermore, the vehicle navigation device 920 may include an antenna 937 for each wireless communication method. In this case, the antenna switch 936 can be omitted from the configuration of the vehicle navigation device 920.

[0340] Battery 938 supplies power to the battery via the power lines shown as dashed lines in the diagram. Figure 16 The various components of the in-vehicle navigation device 920 illustrated are powered. In addition, the battery 938 accumulates the power supplied from the vehicle.

[0341] The technology disclosed herein can also be implemented as an in-vehicle system (or vehicle) 940 including one or more components of an in-vehicle navigation device 920, an in-vehicle network 941, and a vehicle module 942. The vehicle module 942 generates vehicle data, such as vehicle speed, engine speed, and fault information, and outputs the generated data to the in-vehicle network 941.

[0342] Furthermore, the effects described in this specification are merely illustrative or exemplary, and not limiting. That is, other effects that will be apparent to those skilled in the art, as described in this specification, can be obtained in conjunction with or in lieu of the aforementioned effects, according to the technology disclosed herein.

[0343] Alternatively, this technology can also be configured as follows.

[0344] (1) A terminal device for communicating with a base station device, comprising:

[0345] Upper-layer processing unit, configured to perform SPDSCH setting via upper-layer signaling from base station equipment; and

[0346] The receiving unit is configured to receive PDSCH without SPDSCH setting, and to receive SPDSCH with SPDSCH setting.

[0347] SPDSCH is mapped to any one of one or more candidate SPDSCHs set according to the SPDSCH settings, and

[0348] The number of symbols for resources used for mapping SPDSCH is less than the number of symbols for resources used for mapping PDSCH.

[0349] (2) The terminal device according to (1), wherein the number of symbols of the resources used for PDSCH mapping is predetermined, and the number of symbols of the resources used for SPDSCH mapping is set according to the SPDSCH setting.

[0350] (3) The terminal device according to (1) or (2), wherein the receiving unit performs receiving processing on all candidate SPDSCH.

[0351] (4) The terminal device according to (3), wherein the receiving unit receives a PDCCH containing control information for initiating the scheduling of an SPDSCH set according to the SPDSCH setting, and

[0352] Upon detecting control information, the receiving unit begins receiving and processing.

[0353] (5) The terminal device according to (3) or (4), wherein the receiving unit receives a PDCCH containing control information for releasing the scheduling of the SPDSCH set according to the SPDSCH setting, and

[0354] Upon detecting control information, the receiving unit ceases receiving and processing.

[0355] (6) A base station device for communicating with a terminal device, comprising:

[0356] Upper-layer processing unit, configured to perform SPDSCH settings in the terminal device via upper-layer signaling; and

[0357] The transmitting unit is configured to transmit PDSCH without setting SPDSCH, and to transmit SPDSCH with setting SPDSCH.

[0358] SPDSCH is mapped to any one of one or more candidate SPDSCHs set according to the SPDSCH settings, and

[0359] The number of symbols for resources used for mapping SPDSCH is less than the number of symbols for resources used for mapping PDSCH.

[0360] (7) The base station equipment according to (6), wherein the number of symbols of the resources used for PDSCH mapping is predetermined, and the number of symbols of the resources used for SPDSCH mapping is set according to the SPDSCH setting.

[0361] (8) The base station equipment according to (6) or (7), wherein it is assumed that all candidate SPDSCH undergoes reception processing in the terminal equipment.

[0362] (9) The base station equipment according to (8), wherein the transmitting unit transmits a PDCCH containing control information for initiating the scheduling of an SPDSCH configured according to the SPDSCH settings, and

[0363] When control information is sent, the sending unit considers that the terminal device has begun receiving and processing.

[0364] (10) The base station equipment according to (8) or (9), wherein the transmitting unit receives a PDCCH containing control information for releasing the scheduling of the SPDSCH set according to the SPDSCH setting, and

[0365] When control information is sent, the sending unit assumes that the terminal device has stopped receiving and processing.

[0366] (11) A communication method used in a terminal device communicating with a base station device, comprising:

[0367] The steps for setting SPDSCH are performed via signaling from the upper layer of the base station equipment; and

[0368] The steps for receiving PDSCH without setting SPDSCH, and the steps for receiving SPDSCH with setting SPDSCH.

[0369] SPDSCH is mapped to any one of one or more candidate SPDSCHs set according to the SPDSCH settings, and

[0370] The number of symbols for resources used for mapping SPDSCH is less than the number of symbols for resources used for mapping PDSCH.

[0371] (12) A communication method used in a base station device communicating with a terminal device, comprising:

[0372] The steps for setting SPDSCH in the terminal device are performed through upper-layer signaling; and

[0373] Sending PDSCH without configuring SPDSCH, and sending SPDSCH with configuring SPDSCH.

[0374] SPDSCH is mapped to any one of one or more candidate SPDSCHs set according to the SPDSCH settings, and

[0375] The number of symbols for resources used for mapping SPDSCH is less than the number of symbols for resources used for mapping PDSCH.

[0376] List of reference numerals

[0377] 1. Base station equipment

[0378] 2. Terminal equipment

[0379] 101, 201 Upper-layer processing units

[0380] 103, 203 Control Units

[0381] Receiver units 105 and 205

[0382] Transmitting units 107 and 207

[0383] 109, 209 transceiver antennas

[0384] 1051, 2051 decoding units

[0385] 1053, 2053 demodulation units

[0386] 1055, 2055 Dedicated Units

[0387] 1057, 2057 Wireless Receiver Unit

[0388] 1059, 2059 Channel Measurement Units

[0389] 1071, 2071 coding units

[0390] 1073, 2073 modulation units

[0391] 1075, 2075 multiplexed units

[0392] 1077, 2077 Wireless Transmitting Units

[0393] 1079 Downlink Reference Signal Generation Unit

[0394] 2079 Uplink Reference Signal Generation Unit

Claims

1. A terminal device for communicating with a base station device, comprising: The upper-layer processing unit is configured to set the bitmap information of the resources that the channel can be mapped to and the resource block information of the frequency direction that the channel can be mapped to over a predetermined duration by signaling from the upper layer of the base station equipment. as well as The control unit is configured to set a first mode as the unit receiving the predetermined duration and a second mode as the unit receiving symbols via signaling from the physical layer of the base station equipment. This involves mapping channels to any one of one or more candidate channels within a resource, determined at least based on bitmap information and resource block information, and... The bitmap information indicates whether the candidate channel is included in the resource for the duration corresponding to each bit.

2. The terminal device according to claim 1, The predetermined duration is a time frame containing 14 symbols.

3. The terminal device according to claim 1 or 2, The number of symbols for the resources corresponding to the channel in the second mode is set based on the second mode.

4. The terminal device according to any one of claims 1 to 3 further comprises: The receiving unit is configured to receive the channel according to a pattern set by the control unit. The receiving unit performs reception processing on all candidate channels.

5. The terminal device according to claim 4, wherein the receiving unit receives a PDCCH containing control information for scheduling the channel in the second mode, and The receiving unit initiates receiving processing upon detecting the control information.

6. The terminal device according to claim 4, wherein the receiving unit receives a PDCCH containing control information for de-scheduling the channel in the second mode, and The receiving unit stops receiving the control information upon detection.

7. A base station device for communicating with terminal devices, comprising: The upper-layer processing unit is configured to set bitmap information of resources that the channel can be mapped to and resource block information of the frequency direction that the channel can be mapped to for a predetermined duration by upper-layer signaling to the terminal device. as well as The control unit is configured to set a first mode as the unit of receiving the predetermined duration and a second mode as the unit of receiving symbols for the terminal device via physical layer signaling. This involves mapping channels to any one of one or more candidate channels within a resource, determined at least based on bitmap information and resource block information, and... The bitmap information indicates whether the candidate channel is included in the resource for the duration corresponding to each bit.

8. A communication method used in a terminal device communicating with a base station device, comprising: The signaling from the upper layer of the base station equipment sets the bitmap information of the resources that the channel can be mapped to and the resource block information of the frequency direction to which the channel can be mapped for a predetermined duration. as well as The signaling from the physical layer of the base station equipment is configured to serve as a first mode for receiving the predetermined duration per unit and a second mode for receiving a single symbol per unit. This involves mapping channels to any one of one or more candidate channels within a resource, determined at least based on bitmap information and resource block information, and... The bitmap information indicates whether the candidate channel is included in the resource for the duration corresponding to each bit.

9. A communication method used in a base station device communicating with a terminal device, comprising: The upper-layer signaling sets the bitmap information of the resources that the channel can be mapped to and the resource block information of the frequency direction that the channel can be mapped to for a predetermined duration for the terminal device. as well as The physical layer signaling configures the terminal device with a first mode as the unit of receiving the predetermined duration and a second mode as the unit of receiving symbols. This involves mapping channels to any one of one or more candidate channels within a resource, determined at least based on bitmap information and resource block information, and... The bitmap information indicates whether the candidate channel is included in the resource for the duration corresponding to each bit.

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