JP2016042612A - Terminal device, base station device, communication method, integrated circuit, and communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable efficient transmission and reception of signals including control information between a base station device and a terminal device.SOLUTION: A terminal device includes: a transmission processing unit that transmits a signal generated from a transport block by placing it on a PUSCH; a control unit that determines an identifier used in an EPHICH including data comprising an ACK/NACK for the transport block on the basis of the index of a UL PRB used in the PUSCH and the cyclic shift of a DMRS; and a reception processing unit that demodulates a signal placed within an EPHICH set including the EPHICH, decodes the demodulated signal, and outputs data obtained by decoding to the control unit. The control unit determines whether the data input by the reception processing unit corresponds to the identifier.SELECTED DRAWING: Figure 4

Description

  The present invention efficiently configures a physical channel through which control information is transmitted and received in a communication system including a plurality of terminal apparatuses and a base station apparatus, and the base station apparatus efficiently transmits control information to the terminal apparatus. The terminal device relates to a terminal device, a base station device, a communication method, an integrated circuit, and a communication system that can receive a signal including control information from the base station device efficiently.

  The evolution of cellular mobile radio access and wireless networks (hereinafter referred to as “Long Term Evolution (LTE)” or “Evolved Universal Terrestrial Radio Access (EUTRA)”) is the third generation partnership project (3rd Generation Partnership Project: 3GPP). In LTE, an Orthogonal Frequency Division Multiplexing (OFDM) system that is multicarrier transmission is used as a communication system for wireless communication (downlink; referred to as DL) from a base station apparatus to a terminal apparatus. In LTE, a SC-FDMA (Single-Carrier Frequency Division Multiple Access) system, which is single carrier transmission, is used as a communication system for radio communication (uplink; referred to as UL) from a terminal apparatus to a base station apparatus. It is done. In LTE, a DFT-Spread OFDM (Discrete Fourier Transform-Spread OFDM) system is used as an SC-FDMA system.

  LTE-A (LTE-Advanced) that develops LTE and applies new technology has been specified. LTE-A supports at least the same channel structure as LTE. A channel means a medium used for signal transmission. A channel used in the physical layer is called a physical channel, and a channel used in the medium access control (MAC) layer is called a logical channel. Physical channel types include physical downlink shared channel (PDSCH) used for transmission / reception of downlink data and control information, and physical downlink control channel (Physical) used for transmission / reception of downlink control information. Downlink Control CHannel (PDCCH), Enhanced Physical Downlink Control Channel (EPDCCH) used for transmission / reception of downlink control information, Physical Hybrid used for transmission / reception of downlink control information for uplink data Automatic repeat request channel (Physical Hybrid ARQ (Automatic Repeat reQuest) Indicator Channel: PHICH), physical uplink shared channel (PUSCH) used for transmission / reception of uplink data and control information, transmission / reception of control information Physical uplink control channel used for (Physical Uplink Control CHannel: PUCCH), synchronization channel (Synchronization CHannel: SCH) used for establishment of downlink synchronization, physical random access channel (Physical Random Access CHannel: PRACH) used for establishment of uplink synchronization ), A physical broadcast channel (Physical Broadcast CHannel: PBCH) used for transmission of downlink system information, a physical multicast channel (Physical Multicast CHannel: PMCH) used for transmission / reception of multicast data, and the like. A terminal device or a base station device arranges and transmits a signal generated from control information, data, etc. in each physical channel. Data transmitted on the physical downlink shared channel or the physical uplink shared channel is referred to as a transport block.

  The control information arranged in the physical uplink control channel is referred to as uplink control information (UCI). Uplink control information is control information (acknowledgment: ACK) or negative acknowledgment (Negative Acknowledgement: NACK) for data placed in the received physical downlink shared channel (acknowledgement: ACK / NACK), Alternatively, it is control information (Scheduling Request: SR) indicating an uplink resource allocation request, or control information (Channel Quality Indicator: CQI) indicating downlink reception quality (also referred to as channel quality). The control information arranged in the physical hybrid automatic repeat request instruction channel is control information (Acknowledgement: ACK) or negative acknowledgment (Negative Acknowledgement: NACK) for the data arranged in the received physical uplink shared channel ( Acknowledgment (ACK / NACK).

  The base station apparatus can set a frequency resource (EPDCCH set) in which an extended physical downlink control channel can be arranged in the system band. Different base station apparatuses set frequency resources in which the extended physical downlink control channel can be allocated to different frequency resources, thereby supporting interference coordination in the frequency domain for the EPDCCH. Collaborative communication is applied to the extended physical downlink control channel, and the base station apparatus configures a plurality of EPDCCH sets in the terminal apparatus, and different base station apparatuses transmit signals of the extended physical downlink control channel in each EPDCCH set. A technology (Dynamic Point Switching: DPS) for dynamically switching the transmission destination of the extended physical downlink control channel transmitted to the terminal device is supported.

  Introduction of a new carrier type (New Carrier Type: NCT) in which existing control signaling and a common reference signal are minimized has been studied (Non-patent Document 1). As one of the examination items, improvement of the control signal is being studied. Here, the existing control signaling includes, for example, control information transmitted / received using a physical downlink control channel. Here, the common reference signal includes, for example, cell-specific reference signals (CRS). The cell-specific reference signal is used for demodulation of signals of the physical downlink control channel and the physical hybrid automatic repeat request instruction channel. As a reference signal that is not common to all terminal devices in the system, in other words, as a reference signal specific to the terminal device, a reference signal (UE-specific reference signals associated with PDSCH) used for demodulation of the physical downlink shared channel signal. ), A reference signal used for demodulation of the signal of the extended physical downlink control channel (Demodulation reference signals associated with EPDCCH).

3GPP TSG RAN # 58, Barcelona, Spain, December 4-7, 2012, RP-122028 “Revised WID on New Carrier Type for LTE”

  Since cell-specific reference signals are used for demodulating the signal of the physical hybrid automatic repeat request instruction channel, control information indicating an acknowledgment or a negative response to data arranged in the physical uplink shared channel while minimizing the common reference signal In order to make it possible to transmit and receive data, it is desirable to use a new physical channel without using a physical hybrid automatic repeat request instruction channel in a system band using a new carrier type.

  The present invention has been made in view of the above points, and an object of the present invention is to efficiently control information (for a base station device) with respect to a terminal device in a communication system including a plurality of terminal devices and a base station device. ACK / NACK) can be transmitted, and the terminal device can efficiently receive a signal including control information (ACK / NACK) from the base station device, a base station device, a communication method, The present invention relates to an integrated circuit and a communication system.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, a terminal apparatus according to the present invention is a terminal apparatus that communicates with a base station apparatus, and arranges a signal generated from a transport block on a PUSCH and transmits the signal to the base station apparatus, and the transformer. A control unit that determines an identifier used for EPHICH including data including ACK / NACK for a port block based on an index of UL PRB used for the PUSCH and a cyclic shift of DM RS, and EPHICH in which the EPHICH is configured a reception processing unit that demodulates a signal arranged in the set, decodes the demodulated signal, and outputs data obtained by decoding to the control unit, and the control unit receives the reception It is determined whether or not the data input from the processing unit corresponds to the identifier.

  (2) Moreover, the base station apparatus of this invention is a base station apparatus which communicates with several terminal device, Comprising: The reception processing part which receives the signal arrange | positioned from said terminal device to PUSCH, and the said terminal device The EPHICH corresponding to the UL PRB index assigned to the PUSCH to which the resource is assigned and the cyclic shift of the DM RS, the ACK / NACK for the transport block received on the PUSCH, and the identifier corresponding to the EPHICH The transmission unit generates a transmission signal from the control unit that controls to arrange the signal generated from the ACK / NACK for the transport block received by the PUSCH, and the identifier corresponding to the EPHICH, and the generated signal is the EPHICH A transmission processing unit arranged and transmitted to the EPHIC A different identifier is associated with each H.

  (3) Moreover, the communication method of this invention is a communication method used for the terminal device which communicates with a base station apparatus, Comprising: The signal produced | generated from the transport block is arrange | positioned in PUSCH, and it transmits to the said base station apparatus Determining an identifier used in EPHICH including data consisting of ACK / NACK for the transport block based on an index of UL PRB used for the PUSCH and a cyclic shift of DM RS, and the EPHICH A step of demodulating a signal arranged in an EPHICH set configured to acquire data by decoding the demodulated signal, and whether or not the acquired data corresponds to the determined identifier And at least a step of determining.

  (4) Moreover, the integrated circuit of the present invention is an integrated circuit mounted on a terminal device that communicates with a base station device, and a signal generated from a transport block is arranged on the PUSCH to the base station device. A transmission processing unit to transmit, and a control unit that determines an identifier used for EPHICH including data including ACK / NACK for the transport block based on an index of UL PRB used for the PUSCH and a cyclic shift of DM RS And a reception processing unit that demodulates a signal arranged in an EPHICH set that constitutes the EPHICH, decodes the demodulated signal, and outputs the data obtained by decoding to the control unit. The control unit determines whether the data input from the reception processing unit corresponds to the identifier. The features.

  (5) Moreover, the communication system of this invention is a communication system comprised from the base station apparatus which communicates with several terminal devices and these several terminal devices, Comprising: The said terminal device is produced | generated from the transport block. The first transmission processing unit that arranges the received signal on the PUSCH and transmits the signal to the base station apparatus, and the identifier used in EPHICH including data including ACK / NACK for the transport block is used as the UL PRB used in the PUSCH. A first control unit that makes a determination based on the index of the RS and the cyclic shift of the DM RS, and demodulates the signal arranged in the EPHICH set in which the EPHICH is configured, and decodes and decodes the demodulated signal A first reception processing unit that outputs the data obtained in this way to the control unit, A transmission signal is generated from a second reception processing unit that receives a signal placed on the PUSCH from the terminal device, and an ACK / NACK for the transport block received on the PUSCH received by the second reception processing unit And a second transmission processing unit configured to transmit the generated signal to the EPHICH, and the first control unit determines the data input from the first reception processing unit It is characterized by determining whether or not it corresponds to the identifier.

  (6) Moreover, the communication method of this invention is a communication method used for the base station apparatus which communicates with several terminal device, Comprising: The step which receives the signal arrange | positioned to PUSCH from the said terminal device, The said terminal The EPHICH corresponding to the UL PRB index and DM RS cyclic shift allocated to the PUSCH to which resources are allocated to the device, the ACK / NACK for the transport block received on the PUSCH, and the EPHICH A step of controlling to arrange a signal generated from an identifier, an ACK / NACK for a transport block received by the PUSCH, and an identifier corresponding to the EPHICH, and generating the generated signal as the signal Placing in the EPHICH and transmitting; It includes at least a different identifier for each EPHIICH.

  (7) Moreover, the integrated circuit of the present invention is an integrated circuit mounted on a base station device that communicates with a plurality of terminal devices, and includes a reception processing unit that receives a signal placed on the PUSCH from the terminal device. , The EPHICH corresponding to the UL PRB index and DM RS cyclic shift allocated to the PUSCH to which resources are allocated to the terminal apparatus, the ACK / NACK for the transport block received on the PUSCH, and the EPHICH A transmission unit is generated and generated from a control unit that controls to arrange a signal generated from an identifier corresponding to the ID, an ACK / NACK for the transport block received by the PUSCH, and an identifier corresponding to the EPHICH A transmission processing unit for arranging and transmitting the processed signal in the EPHICH; And different identifiers are associated with each EPHIICH.

  (8) The terminal device of the present invention is a terminal device that communicates with the base station device, and includes a reception processing unit that receives information indicating the configuration of one or more EPHICH sets from the base station device, and a transformer. A transmission processing unit that arranges the signal generated from the port block on the PUSCH and transmits the PUSCH to the base station apparatus, and determines the EPHICH indexing configured for each EPHICH set based on the information, and An index of EPHICH including ACK / NACK is determined based on an index of UL PRB used for the PUSCH and a cyclic shift of DM RS, and the index of the index with respect to the signal of the EPHICH set in which the EPHICH of the index is arranged Performs processing to detect EPHIICH And a control unit for controlling as described above.

  (9) Moreover, the communication method of this invention is a communication method used for the terminal device which communicates with a base station apparatus, Comprising: The step which receives the information which shows the structure of one or more EPHICH set from the said base station apparatus A step of transmitting a signal generated from the transport block to the PUSCH and transmitting the signal to the base station apparatus, and determining an indexing of the EPHICH configured for each EPHICH set based on the information, and the transport block An index of EPHICH including ACK / NACK with respect to is determined based on an index of UL PRB used for the PUSCH and a cyclic shift of DM RS, and the index with respect to the signal of the EPHIICH set in which the EPHICH of the index is arranged Check EPHIICH And a step of controlling to perform the process to be performed.

  (10) An integrated circuit according to the present invention is an integrated circuit mounted on a terminal apparatus that communicates with a base station apparatus, and receives information indicating the configuration of one or more EPHICH sets from the base station apparatus. A reception processing unit, a transmission processing unit configured to transmit the signal generated from the transport block to the PUSCH and transmit the signal to the base station apparatus, and indexing of the EPHICH configured for each EPHICH set based on the information The EPHICH index including the ACK / NACK for the transport block is determined based on the UL PRB index used for the PUSCH and the cyclic shift of the DM RS, and the EPHICH set signal in which the EPHICH of the index is arranged The index EPHIC And a control unit that controls to perform the process of detecting H.

  (11) Moreover, the base station apparatus of the present invention is a base station apparatus that communicates with a plurality of terminal apparatuses, and a radio resource control unit that sets one or more EPHICH set configurations for the terminal apparatuses; The PUSCH based on the reception processing unit that receives the signal allocated to the PUSCH from the terminal device, the index of the UL PRB allocated to the PUSCH to which the resource is allocated to the terminal device, and the cyclic shift of the DM RS. A control unit that determines an EPHICH in which a signal including ACK / NACK for the received transport block is arranged, and controls the EPHIICH to arrange and transmit the EPHIICH signal in the corresponding EPHIICH set; It is characterized by having.

  (12) Further, the communication method of the present invention is a communication method used for a base station apparatus that communicates with a plurality of terminal apparatuses, and sets a configuration of one or more EPHICH sets for the terminal apparatuses. Receiving on the PUSCH based on the step of receiving a signal allocated to the PUSCH from the terminal device, and the index of the UL PRB allocated to the PUSCH to which the resource is allocated to the terminal device and the cyclic shift of the DM RS. Determining an EPHICH in which a signal including ACK / NACK for the transport block is arranged, and controlling the EPHIICH to arrange and transmit the EPHICH signal in the corresponding EPHICH set It is characterized by that.

  (13) The integrated circuit of the present invention is an integrated circuit mounted on a base station apparatus that communicates with a plurality of terminal apparatuses, and sets one or more EPHICH set configurations for the terminal apparatuses. A radio resource control unit, a reception processing unit that receives a signal allocated to PUSCH from the terminal device, an index of UL PRB allocated to the PUSCH to which resources are allocated to the terminal device, and a cyclic shift of DM RS, The EPHICH in which a signal including ACK / NACK for the transport block received on the PUSCH is arranged based on the EPHICH, and the EPHIICH is arranged to transmit the EPHIICH signal in the corresponding EPHICH set And a control unit.

  (14) Further, the communication system of the present invention is a communication system including a plurality of terminal devices and a base station device that communicates with the plurality of terminal devices, and the terminal device includes one or more EPHICH sets. A first reception processing unit that receives information indicating the configuration of the base station device, a transmission processing unit that places the signal generated from the transport block on the PUSCH and transmits the signal to the base station device, and the information Based on the index of EPHICH configured for each EPHICH set, and the index of EPHICH including ACK / NACK for the transport block based on the index of UL PRB used for the PUSCH and the cyclic shift of DM RS Judgment and before EPHICH of the index is placed A first control unit that performs control to detect the EPHICH of the index with respect to the signal of the EPHICH set, and the base station device has a configuration of one or more EPHICH sets in the terminal device A radio resource control unit to be set for the second reception processing unit for receiving a signal allocated to the PUSCH from the terminal device, and an index of the UL PRB allocated to the PUSCH to which the resource is allocated to the terminal device EPHICH in which a signal including ACK / NACK for the transport block received on the PUSCH is arranged based on the cyclic shift of DM RS and DM RS is determined, and the EPHICH signal is arranged in the EPHIICH set corresponding to the EPHIICH And a second control unit that controls to transmit Characterized in that it has a.

  In the present specification, the present invention is disclosed in terms of improvement of a terminal device, a base station device, a communication method, an integrated circuit, and a communication system in which a physical channel for transmitting / receiving ACK / NACK in the downlink is used. The communication method to which can be applied is not limited to a communication method that is upward compatible with LTE, such as LTE or LTE-A.

  According to the present invention, the base station apparatus can efficiently transmit a signal including control information (ACK / NACK) to the terminal apparatus, and the terminal apparatus can efficiently transmit the control information (ACK / N) from the base station apparatus. NACK) can be received, and a more efficient communication system can be realized.

It is a schematic block diagram which shows the structure of the base station apparatus 3 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the transmission process part 107 of the base station apparatus 3 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the reception process part 101 of the base station apparatus 3 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the terminal device 5 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the reception process part 401 of the terminal device 5 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the transmission process part 407 of the terminal device 5 which concerns on embodiment of this invention. It is a figure explaining the outline about the whole picture of the communications system concerning the embodiment of the present invention. It is a figure which shows schematic structure of the time frame of the downlink from the base station apparatus 3 which concerns on embodiment of this invention to the terminal device 5. FIG. It is a figure which shows an example of arrangement | positioning of the 1st reference signal in the downlink sub-frame of the communication system 1 which concerns on embodiment of this invention. It is a figure which shows an example of arrangement | positioning of the 2nd reference signal in the downlink sub-frame of the communication system 1 which concerns on embodiment of this invention. It is a figure which shows schematic structure of the time frame of the uplink from the terminal device 5 to the base station apparatus 3 which concerns on embodiment of this invention. It is a figure which shows an example of schematic structure of EPDCCH set of the communication system 1 which concerns on embodiment of this invention. It is a figure explaining the logical relationship of EPDCCH and ECCE of the communication system 1 which concerns on embodiment of this invention. It is a figure which shows an example of a structure of EREG of embodiment of this invention. It is a figure which shows an example of Localized mapping of embodiment of this invention. It is a figure which shows an example of Localized mapping of embodiment of this invention. It is a figure which shows an example of Localized mapping of embodiment of this invention. It is a figure which shows an example of Distributed mapping of embodiment of this invention. It is a figure which shows an example of Distributed mapping of embodiment of this invention. It is a figure which shows an example of Distributed mapping of embodiment of this invention.

  The techniques described herein include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal FDMA (OFDMA) systems, single carrier FDMA (SC-FDMA). ) System, and other systems, such as other systems. The terms “system” and “network” can often be used interchangeably. A CDMA system may implement a radio technology (standard) such as Universal Terrestrial Radio Access (UTRA) or cdma2000®. UTRA includes Wideband CDMA (WCDMA) and other improved versions of CDMA. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM). OFDMA systems such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM (registered trademark), etc. Wireless technology may be implemented. 3GPP LTE (Long Term Evolution) is an E-UTRA that employs OFDMA on the downlink and SC-FDMA on the uplink. LTE-A is a system, radio technology, and standard improved from LTE. UTRA, E-UTRA, LTE, LTE-A and GSM are described in documents from an organization named Third Generation Partnership Project (3GPP). cdma2000 and UMB are described in documents from an organization named Third Generation Partnership Project 2 (3GPP2). For clarity, certain aspects of the techniques are described below for data communication in LTE, LTE-A, and LTE terminology, LTE-A terminology is used in much of the description below.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description disclosed below in connection with the appended drawings is intended as a description of exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without such specific details. For example, the following detailed description will be specifically made assuming that the mobile communication system is a 3GPP LTE, LTE-A system, but other than the specific matters of 3GPP LTE, LTE-A It can be applied to any mobile communication system. Further, the terms described later are terms defined in consideration of the functions in the present invention, and may vary depending on the intention of the user, the operator, or customs. Therefore, the term should be defined based on the contents throughout this specification.

  In describing the embodiment, the technical contents that are well known in the technical field to which the present invention belongs and are not directly related to the present invention will not be described. This is for omitting unnecessary explanations and transmitting the subject matter of the present invention more clearly without obscuring the gist of the present invention. Thus, in some cases, well-known structures and devices are omitted to avoid obscuring the concepts of the present invention, or illustrated in block diagram form with a focus on the core functions of each structure and device. be able to. In order not to obscure the subject matter of the present invention but to convey it more clearly, some components are exaggerated, omitted or schematically shown in the drawings. Further, the size of each component does not reflect the actual size. In addition, the same components throughout the present specification will be described using the same reference numerals.

Throughout the specification, when a part “includes” a component, this does not exclude the other component, but excludes the other component unless specifically stated to the contrary. It can be included. Further, the term “or” as used in either the detailed description or the claims is intended to mean an inclusive “or” rather than an exclusive “or”. That is, unless otherwise specified or apparent from the context, the phrase “X uses A or B” is intended to mean any of the natural inclusive permutations. ing. That is, the phrase “X uses A or B” is satisfied by any of the following examples: X uses A; X uses B; or X is both A and B Also used. In addition, the articles “a” and “an” as used in the present application and the appended claims are common unless otherwise specified or apparent from the context of the singular. Should be interpreted to mean "one or more". Further, terms such as “... part”, “... device”, “module” described in the specification mean a unit for processing at least one function or operation, and this means hardware, software, or hardware. And a combination of software.

  In addition, in the following description, a terminal device is a user equipment (User Equipment: UE), a mobile station (Mobile Station: MS, Mobile Terminal: MT), a mobile station device, a mobile terminal, a subscriber unit, a subscriber station, A mobile terminal or a mobile terminal such as a wireless terminal, a mobile device, a node, a device, a remote station, a remote terminal, a wireless communication device, a wireless communication apparatus, a user agent, and an access terminal are collectively referred to. Terminal equipment includes cellular phones, cordless phones, session initiation protocol (SIP) phones, smartphones, wireless local loop (WLL) stations, personal digital assistants (PDAs), tablets, laptops, handheld communication devices, handheld computing devices. Satellite radio, wireless modem card, USB modem, router, and / or another processing device for communicating through the wireless system. The base station apparatus is a generic term for any node at the network end that communicates with a terminal such as a node B (NodeB), an enhanced node B (eNodeB), a base station, and an access point (Access Point: AP). Note that the base station apparatus includes RRH (Remote Radio Head, an apparatus having an outdoor type radio unit smaller than the base station apparatus, also referred to as Remote Radio Unit: RRU) (also referred to as a remote antenna or a distributed antenna). . The RRH can be said to be a special form of the base station apparatus. For example, the RRH has only a signal processing unit, and can be said to be a base station apparatus in which parameters used in the RRH are set by another base station apparatus and scheduling is determined.

  A terminal apparatus according to the present invention includes a memory that holds instructions related to various processes described below, and a processor that is coupled to the memory and configured to execute the instructions held in the memory. Other configurations may be used. The base station apparatus of the present invention includes a memory that holds instructions related to various processes described below, and a processor that is coupled to the memory and configured to execute the instructions held in the memory. The structure provided may be sufficient.

  An overview of the communication system according to the present embodiment, a configuration of a radio frame, and the like will be described with reference to FIGS. The configuration of the communication system according to the present embodiment will be described with reference to FIGS. The operation process of the communication system according to the present embodiment will be described with reference to FIGS.

  FIG. 7 is a diagram for explaining the outline of the overall image of the communication system according to the embodiment of the present invention. The communication system 1 shown in this figure includes a plurality of base station devices (base station device 3A, base station device 3B) and a plurality of terminal devices (terminal device 5A, terminal device 5B, terminal device 5C, terminal device 5D, terminal device). 5E) communicates. A mode in which the base station apparatus communicates using any one frequency band is referred to as a “cell”. In the communication system 1, the cell 7A is a cell formed by the base station device 3A, and the cell 7B is a cell formed by the base station device 3B. For example, in the cell 7A, the base station device 3A communicates with the terminal device 5A, the terminal device 5B, and the terminal device 5C. For example, in the cell 7B, the base station device 3B communicates with the terminal device 5C, the terminal device 5D, and the terminal device 5E. Hereinafter, in this embodiment, the base station device 3A and the base station device 3B are referred to as the base station device 3, the terminal device 5A, the terminal device 5B, the terminal device 5C, the terminal device 5D, and the terminal device 5E are referred to as the terminal device 5, An explanation will be given as appropriate.

  For example, in FIG. 7, a technique (Dynamic Point Switching: DPS) for dynamically switching a transmission destination can be applied to a terminal device 5C located in an area where the coverage of the base station device 3A and the coverage of the base station device 3B overlap. . The transmission destination of the downlink signal for the terminal device 5C can be dynamically switched to either the base station device 3A or the base station device 3B. Here, it should be noted that “dynamic switching” means switching in units of subframes, which will be described later, and is not switching destinations by handover. Note that it is not always necessary to switch in units of subframes, and the transmission destination is switched only in subframes where necessity arises.

  Note that the number of base station devices 3 and the number of terminal devices 5 shown in FIG. 7 are examples, and different numbers of base station devices 3 and terminal devices 5 may exist in the communication system 1. In addition, although illustration is abbreviate | omitted, the communication system 1 is located in the terminal of a network, contains the gateway (Access Gataway: AG) connected with an external network, and each base station apparatus 3 is connected with a gateway.

  One base station apparatus 3 has one or more cells. The cell is set to one of bandwidths such as 1.25, 2.5, 5, 10, 15, and 20 MHz, and provides downlink or uplink transmission service to many terminal apparatuses 5. Separate cells can be configured to provide separate bandwidth. The base station device 3 controls data transmission / reception with respect to a large number of terminal devices 5. The base station apparatus 3 transmits downlink schedule information to the downlink data, and the time / frequency domain in which data is transmitted to the corresponding terminal, encoding, data size, hybrid automatic retransmission request (HARQ) related information Let us know. Also, the base station apparatus 3 transmits uplink schedule information to the corresponding terminal apparatus 5 for the uplink data, and the time / frequency domain, encoding, data size, hybrid automatic that the corresponding terminal apparatus 5 can use. Notify information related to retransmission requests. An interface for transmitting user information (user traffic) or control information (control traffic) can be used between the base station apparatuses 3. For example, the interface is realized by a wired line such as an optical fiber or a digital subscriber line, or a wireless line using relay technology. The core network (CN) can be composed of network nodes for user registration of AGs and terminals. The AG manages the mobility of the terminal device 5 in units of tracking area (TA) composed of a plurality of cells.

  In the communication system 1, in a cell using a new carrier type, a downlink (also referred to as DL: Downlink) that is a communication direction from the base station apparatus 3 to the terminal apparatus 5 is an enhanced physical downlink control channel (Enhanced Physical downlink control channel). Downlink Control CHannel (EPDCCH), Enhanced Physical Hybrid Automatic Repeat Request Channel (Enhanced Physical Hybrid ARQ (Automatic Repeat reQuest) Indicator Channel: EPHICH), and Physical Downlink Shared Channel (PDSCH: Physical Downlink Shared CHannel) Consists of including. Further, the downlink is used for demodulation of a reference signal (UE-specific reference signals associated with PDSCH) (hereinafter referred to as a first reference signal for convenience of explanation) and an EPDCCH signal. It includes a reference signal (Demodulation reference signals associated with EPDCCH) (hereinafter referred to as a second reference signal for convenience of explanation). EPHICH is a physical channel used for transmission / reception of downlink control information for uplink data. Further, the second reference signal is also used for demodulating the EPHIICH signal, but a reference signal different from the second reference signal may be defined.

  In the description of the embodiment of the present invention, a description of a cell using an existing carrier type (Legacy carrier) instead of a new carrier type will be omitted as appropriate. In addition, a communication method using multiple cells (carriers) (CA: Carrier Aggregation) is applied, some of the cells (carriers) use existing carrier types, and some of the cells (carriers) use new carrier types. It should be noted that the present invention can be applied to a configuration in which is used.

  In the communication system 1, an uplink (also referred to as UL: Uplink) that is a communication direction from the terminal device 5 to the base station device 3 is also referred to as a physical uplink shared channel (PUSCH: Physical Uplink Shared CHannel). And a physical uplink control channel (also referred to as PUCCH: Physical Uplink Control CHannel). Further, the uplink includes a reference signal (UL RS: Uplink Reference Signal, DM RS: Demodulation Reference Signal) used for demodulation of PUSCH and PUCCH signals. The control information arranged in the EPHICH is control information (acknowledgment acknowledgment: ACK / NACK) (hybrid) indicating an acknowledgment (Acknowledgement: ACK) or negative acknowledgment (Negative Acknowledgement: NACK) for the data arranged in the received PUSCH. -ARQ ACK / NAK) (HARQ indicator) (HARQ acknowledgement) (HARQ ACK).

  A channel means a medium used for signal transmission / reception. Channels used in the physical layer are called physical channels, and channels used in the medium access control (MAC) layer are called logical channels and transport channels. Transport channels include broadcast channels (Broadcast Channel: BCH) used for transmission / reception of broadcast information, downlink shared channels (Downlink Shared Channel: DL-SCH) used for transmission / reception of downlink information data, etc. Paging channel (PCH) used for transmission / reception, multicast channel (Multicast Channel: MCH) used for transmission / reception of multicast data, uplink shared channel (Uplink Shared Channel: UL) used for transmission / reception of uplink information data, etc. -SCH), random access channel (Random Access Channel: RACH) used for random access. As a logical channel, a broadcast control channel (BCCH) used for transmission / reception of broadcast information, a paging control channel (PCCH) used for transmission / reception of paging information, and a common used for transmission / reception of common control information Control channel (Common Control Channel: CCCH), dedicated control channel (DCCH) used for transmission / reception of individual control information, multicast control channel (Multicast Control Channel: MCCH) used for transmission / reception of multicast control information, individual data There are dedicated traffic channels (Dedicated Traffic Channel: DTCH) used for transmission / reception of multicast data, multicast traffic channels (Multicast Traffic Channel: MTCH) used for transmission / reception of multicast data, and the like.

  PDSCH is a physical channel used for transmission / reception of downlink data and control information (different from control information transmitted on EPDCCH). EPDCCH is a physical channel used for transmission / reception of downlink control information (different from control information transmitted by PDSCH). EPHICH is a physical channel used for transmission / reception of ACK / NACK for data arranged in PUSCH. The PUSCH is a physical channel used for transmission / reception of uplink data and control information (different from control information transmitted on the downlink). The PUCCH is a physical channel used for transmission / reception of uplink control information (uplink control information: UCI). As a type of UCI, whether to request an acknowledgment (ACK / NACK) indicating an acknowledgment (Acknowledgement: ACK) or a negative acknowledgment (NACK) for PDSCH downlink data, and resource allocation A scheduling request (SR) or the like indicating that is used. As other physical channel types, transmission of a physical random access channel (Physical Random Access CHannel: PRACH) and downlink system information (also referred to as MIB: Master Information Block) used for establishing uplink synchronization. Physical broadcast channel (PBCH) used for communication, physical downlink control channel (Physical Downlink Control CHannel: PDCCH) used for transmission / reception of downlink control information, transmission / reception of downlink control information for uplink data For example, a physical hybrid automatic retransmission request instruction channel (Physical Hybrid ARQ (Automatic Repeat reQuest) Indicator Channel: PHICH) and a physical multicast channel (Physical Multicast CHannel: PMCH) used for transmission / reception of multicast data are used. Note that PDCCH and PHICH are not used in a cell using a new carrier type. Other physical signals include a synchronization signal used for downlink synchronization establishment, a reference signal (Channel State Information RS: CSI-RS) used for channel state estimation, PDCCH demodulation, etc. A reference signal (Cell specific RS: CRS) or the like used in the above is used. In a cell using a new carrier type, CRS is not used, or CRS with a reduced density for arranging signals is used. For example, CRS is not arranged for each subframe, and CRS is arranged at intervals of a plurality of subframes.

  The terminal device 5 and the base station device 3 arrange a signal generated from control information, data, etc. in each physical channel and transmit it. The terminal apparatus 5 and the base station apparatus 3 receive each physical channel on which signals generated from control information, data, and the like are arranged and transmitted. Data transmitted on the PDSCH or PUSCH is referred to as a transport block.

<Configuration of downlink time frame>
FIG. 8 is a diagram illustrating a schematic configuration of a downlink time frame from the base station apparatus 3 to the terminal apparatus 5 according to the embodiment of the present invention. Here, a downlink time frame of a new carrier type cell will be described. In this figure, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The downlink time frame is a unit for resource allocation and the like, and is a resource block (RB) (physical resource block; also referred to as a PRB: Physical Resource Block) composed of a frequency band and a time slot having a predetermined downlink width. .)) (Physical resource block pair; referred to as PRB pair). One downlink PRB pair (referred to as downlink physical resource block pair; DL PRB pair) is referred to as two consecutive PRBs (downlink physical resource block; DL PRB in the downlink time domain). ).

  Also, in this figure, one DL PRB is composed of 12 subcarriers (referred to as downlink subcarriers) in the downlink frequency domain, and 7 OFDM (orthogonal frequency division multiplexing) in the time domain. ; Orthogonal Frequency Division Multiplexing) symbols. A downlink system band (referred to as a downlink system band) is a downlink communication band of the base station apparatus 3. For example, the downlink system bandwidth (referred to as a downlink system bandwidth) is composed of a frequency bandwidth of 20 MHz.

  In the downlink system band, a plurality of DL PRBs (DL PRB pairs) are arranged according to the downlink system bandwidth. For example, a downlink system band having a frequency bandwidth of 20 MHz is configured by 110 DL PRBs (DL PRB pairs).

  In the time domain shown in this figure, a slot composed of seven OFDM symbols (referred to as a downlink slot) and a subframe composed of two downlink slots (referred to as a downlink subframe). There is.) Note that a unit composed of one downlink subcarrier and one OFDM symbol is referred to as a resource element (RE) (downlink resource element). PDSCH, EPDCCH, and EPHIICH are arranged in each downlink subframe. PDSCH and EPDCCH are arranged in different DL PRB pairs. PDSCH and EPHIICH are arranged in different DL PRB pairs. EPDCCH and EPHIICH are arranged in different DL PRB pairs or the same DL PRB pair.

  In FIG. 8, one or more EPDCCHs may be arranged in the resource indicated as EPDCCH. In FIG. 8, one or more EPHIICHs can be arranged in the resource indicated as EPHIICH. In FIG. 8, one or more PDSCHs may be arranged in the resource indicated as PDSCH.

  Although not shown in the figure, the first reference signal and the second reference signal are arranged in the downlink. The first reference signal is arranged in a plurality of REs in the DL PRB pair in which PDSCH is arranged. The second reference signal is arranged in a plurality of REs in the DL PRB pair in which the EPDCCH is arranged. The second reference signal is arranged in a plurality of REs in the DL PRB pair in which EPHICH is arranged. Details will be described later.

  EPDCCH is information indicating allocation of DL PRB pair to PDSCH, information indicating allocation of UL PRB pair to PUSCH, identifier (referred to as Radio Network Temporary Identifier: RNTI), modulation scheme, coding rate, retransmission parameter, space. A signal generated from control information such as a multiplexing number, a precoding matrix, a transmission power control command (TPC command), and information indicating a cyclic shift value of a reference signal is arranged. Control information included in the EPDCCH is referred to as downlink control information (DCI). DCI including information indicating allocation of DL PRB pair to PDSCH (PDSCH resource allocation information) is referred to as downlink assignment (also referred to as DL assignment or Downlink grant), and UL PRB pair of PUSCH is assigned to UL PRB pair. DCI including information indicating allocation (PUSCH resource allocation information) is referred to as an uplink grant (referred to as UL grant). Note that the downlink assignment includes a transmission power control command for PUCCH. The uplink grant includes a transmission power control command for PUSCH and information indicating the cyclic shift value of the reference signal (DM RS). Note that one EPDCCH includes only information indicating resource allocation of one PDSCH, or information indicating resource allocation of one PUSCH, and information indicating resource allocation of a plurality of PDSCHs, It does not include information indicating PUSCH resource allocation.

  Furthermore, as information transmitted on the EPDCCH, there is a cyclic redundancy check CRC (Cyclic Redundancy Check) code. A relationship between DCI, RNTI, and CRC transmitted on the EPDCCH will be described in detail. A CRC code is generated from DCI using a predetermined generator polynomial. The generated CRC code is subjected to exclusive OR (also referred to as scrambling) processing using RNTI. A signal obtained by modulating a bit indicating DCI and a bit generated by performing exclusive OR processing on the CRC code using RNTI (referred to as CRC masked by UE ID) is actually transmitted on EPDCCH. Is done. For example, RNTI used for EPDCCH is C-RNTI (Cell Radio Network Temporary Identifier) and SPS (Semi-Persistent Scheduling) C-RNTI.

  In EPHIICH, a signal generated from information of a plurality of downlink ACK / NACK, CRC code, and identifier (RNTI) is arranged. A CRC code is generated from a plurality of downlink ACK / NACKs using a predetermined generator polynomial. The generated CRC code is subjected to exclusive OR (also referred to as scrambling) processing using RNTI. A signal obtained by modulating a bit indicating a plurality of downlink ACK / NACK and a bit (referred to as CRC masked by UE ID) generated by performing an exclusive OR process on the CRC code using RNTI And a signal obtained by modulating a plurality of downlink ACK / NACK information bits are actually transmitted by EPHICH. A different identifier is used for each EPHICH. The base station apparatus 3 determines the EPHICH to be transmitted and determines an identifier used for the EPHICH. The terminal device 5 determines the EPHIICH to be detected, and performs a decoding process on the received signal in order to detect the EPHIICH using an identifier corresponding to the EPHIICH. Thereby, the terminal device 5 can determine whether or not the corresponding EPHIICH signal is transmitted to the resource to be detected.

  In the time domain, the PDSCH resource is arranged in the same downlink subframe as the downlink subframe in which the EPDCCH resource including the downlink assignment used for the allocation of the PDSCH resource is arranged.

  The arrangement of downlink reference signals will be described. FIG. 9 is a diagram showing an example of the arrangement of the first reference signals in the downlink subframe of the communication system 1 according to the embodiment of the present invention. In FIG. 9, the arrangement of downlink reference signals in one DL PRB pair will be described, but a common arrangement method is used in a plurality of DL PRB pairs in the downlink system band in which PDSCH is arranged. .

  D1 and D2, which are shaded downlink resource elements, indicate downlink resource elements in which the first reference signal is arranged. FIG. 9 shows an example in which the first reference signals for four antenna ports (antenna port 7, antenna port 8, antenna port 9, and antenna port 10) can be arranged in one DL PRB pair. . Here, the antenna port means a logical antenna used in signal processing, and one antenna port may be composed of a plurality of physical antennas. As for the antenna port used for transmitting the first reference signal, a plurality of physical antennas constituting the same antenna port transmit signals that have undergone different signal processing (for example, different phase rotation processing). Also good. Regarding the antenna port used for transmitting the first reference signal, beam forming can be realized by using a plurality of physical antennas in the same antenna port.

  When the first reference signals for the four antenna ports are used in the downlink, the first reference signals are multiplexed and arranged on different downlink resource elements for each of the two antenna ports. In other words, in this case, CDM and FDM (Frequency Division Multiplexing) are applied to the multiplexing of the first reference signal. In FIG. 9, the first reference signals of antenna port 7 and antenna port 8 are multiplexed by CDM on D1, and the first reference signals of antenna port 9 and antenna port 10 are multiplexed by CDM on D2. When multiplexed by CDM, a different code is used for the first reference signal for each antenna port. For example, a Walsh code is used as the code.

  The first reference signal corresponding to a different number of antenna ports may be arranged in the DL PRB pair instead of four. For example, when the number of antenna ports of the first reference signal configured in the DL PRB pair is one (antenna port 7), in FIG. 9, the first reference signal is only in the downlink resource element indicated by D1. The first reference signal is not arranged in the downlink resource element indicated by D2, and a signal for PDSCH is arranged. For example, when the number of antenna ports of the first reference signal configured in the DL PRB pair is two (antenna port 7 and antenna port 8), only the downlink resource element indicated by D1 in FIG. Reference signal is arranged, and the first reference signal is not arranged in the downlink resource element indicated by D2, and a signal for PDSCH is arranged. For example, the number of antenna ports of the first reference signal configured in the DL PRB pair is eight (antenna port 7, antenna port 8, antenna port 9, antenna port 10, antenna port 11, antenna port 12, and antenna port). 13 and antenna port 14), the number of downlink resource elements in which the first reference signal is arranged is doubled and the code length is 4, compared to the case shown in FIG. UE-specific RSs are multiplexed and arranged using four downlink resource elements as a unit.

  A pseudo random sequence is used for the first reference signal. For example, the pseudo-random sequence is defined by a gold sequence having a length of 31. For example, in the generation of the pseudo-random sequence, initialization is performed based on a cell ID (physical cell ID) and a scramble ID notified from the base station device 3. For example, the scramble ID is a value indicating 0 or 1. For example, in the generation of the pseudo random sequence, a parameter notified individually for each terminal device 5 is used. For example, a virtual cell ID (Virtual cell ID) is notified from the base station device 3 for each terminal device 5 as a parameter. The first reference signal is arranged in the DL PRB pair of the PDSCH assigned to the terminal device 5 that is set to use the first reference signal.

  FIG. 10 is a diagram illustrating an example of the arrangement of the second reference signals in the downlink subframe of the communication system 1 according to the embodiment of the present invention. FIG. 10 illustrates the arrangement of downlink reference signals in a single DL PRB pair. However, there is a common arrangement method in a plurality of DL PRB pairs in the downlink system band in which EPDCCH and EPHICH are arranged. Used.

  D11 and D12, which are shaded downlink resource elements, indicate downlink resource elements in which the second reference signal is arranged. FIG. 10 shows an example of a case where the second reference signals for four antenna ports (antenna port 107, antenna port 108, antenna port 109, and antenna port 110) can be arranged in one DL PRB pair. .

  When the second reference signals for the four antenna ports are used in the downlink, the second reference signals are multiplexed and arranged on different downlink resource elements for each of the two antenna ports. In other words, in this case, CDM and FDM (Frequency Division Multiplexing) are applied to the multiplexing of the second reference signal. In FIG. 10, the second reference signals of antenna port 107 and antenna port 108 are multiplexed by CDM on D11, and the second reference signals of antenna port 109 and antenna port 110 are multiplexed on CD2 by CDM. When multiplexed by CDM, a different code is used for the second reference signal for each antenna port. For example, a Walsh code is used as the code.

  A pseudo random sequence is used for the second reference signal. For example, the pseudo-random sequence is defined by a gold sequence having a length of 31. For example, in the generation of the pseudo-random sequence, initialization is performed based on the ID notified from the base station device 3 to each terminal device 5 and the scramble ID. For example, a fixed value of 2 is used for the scramble ID. For example, in the generation of the pseudo random sequence, a parameter notified individually for each terminal device 5 is used. The second reference signal is arranged in the DL PRB pair of EPDCCH and EPHIICH allocated to the terminal device 5 set to use the second reference signal.

<Configuration of uplink time frame>
FIG. 11 is a diagram illustrating a schematic configuration of an uplink time frame from the terminal apparatus 5 to the base station apparatus 3 according to the embodiment of the present invention. In this figure, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. An uplink time frame is a unit for resource allocation and the like, and is a pair of physical resource blocks (uplink physical resource block pair; UL PRB pair) consisting of a frequency band and a time zone of a predetermined width of the uplink. ). One UL PRB pair is composed of two uplink PRBs (uplink physical resource block; referred to as UL PRB) that are continuous in the uplink time domain.

  Also, in this figure, one UL PRB is composed of 12 subcarriers (referred to as uplink subcarriers) in the uplink frequency domain, and 7 SC-FDMA (Single- Carrier Frequency Division Multiple Access) symbol. An uplink system band (referred to as an uplink system band) is an uplink communication band of the base station apparatus 3. The uplink system bandwidth (referred to as an uplink system bandwidth) is composed of a frequency bandwidth of 20 MHz, for example.

  In the uplink system band, a plurality of UL PRB pairs are arranged according to the uplink system bandwidth. For example, the uplink system band having a frequency bandwidth of 20 MHz is configured with 110 UL PRB pairs. In the time domain shown in this figure, a slot composed of seven SC-FDMA symbols (referred to as an uplink slot) and a subframe composed of two uplink slots (uplink subframe). Called). A unit composed of one uplink subcarrier and one SC-FDMA symbol is referred to as a resource element (referred to as an uplink resource element).

  In each uplink subframe, at least PUSCH used for transmission / reception of information data, PUCCH used for transmission / reception of uplink control information (UCI), and demodulation of signals arranged on PUSCH and PUCCH (propagation channel fluctuation) DM RS for the estimation) is arranged. Although not shown, a PRACH used for establishing uplink synchronization is arranged in any uplink subframe. Although not shown, an SRS used for measurement of channel quality, synchronization loss, and the like is arranged in any uplink subframe. The PUCCH is a UCI (ACK / NACK) indicating an acknowledgment (ACK: Acknowledgement) or a negative acknowledgment (NACK: Negative Acknowledgement) for data received using the PDSCH, and whether or not to request allocation of uplink resources. It is used to transmit at least UCI (SR: Scheduling Request) and UCI (CQI: Channel Quality Indicator) indicating downlink reception quality (also referred to as channel quality).

  When the base station apparatus 3 indicates that the terminal apparatus 5 requests uplink resource allocation, the terminal apparatus 5 transmits a signal using the PUCCH for SR transmission. The base station apparatus 3 recognizes that the terminal apparatus 5 is requesting uplink resource allocation from the result of detecting a signal using the PUCCH resource for transmission of the SR. When the base station apparatus 3 indicates that the terminal apparatus 5 does not request uplink resource allocation, the terminal apparatus 5 does not transmit any signal using the previously allocated PUCCH resource for SR transmission. The base station apparatus 3 recognizes that the terminal apparatus 5 has not requested the allocation of the uplink resource from the result that the signal is not detected in the PUCCH resource for SR transmission.

  Also, PUCCH uses different types of signal configurations depending on whether a UCI composed of ACK / NACK is transmitted, a UCI composed of SR, or a UCI composed of CQI is transmitted. PUCCH used for transmission of ACK / NACK is called PUCCH format 1a or PUCCH format 1b. In PUCCH format 1a, BPSK (Binary Phase Shift Keying) is used as a modulation method for modulating information about ACK / NACK. In PUCCH format 1a, 1-bit information is indicated from the modulated signal. In PUCCH format 1b, QPSK (Quadrature Phase Shift Keying) is used as a modulation method for modulating information about ACK / NACK. In PUCCH format 1b, 2-bit information is indicated from the modulated signal. The PUCCH used for SR transmission is referred to as PUCCH format 1. The PUCCH used for CQI transmission is referred to as PUCCH format 2. PUCCH used for simultaneous transmission of CQI and ACK / NACK is referred to as PUCCH format 2a or PUCCH format 2b. In PUCCH format 2a and PUCCH format 2b, the DM RS is multiplied by a modulation signal generated from ACK / NACK information. In PUCCH format 2a, 1-bit information about ACK / NACK and CQI information are transmitted. In PUCCH format 2b, 2-bit information related to ACK / NACK and CQI information are transmitted.

  One PUSCH is composed of one or more UL PRB pairs, and one PUCCH is symmetrical in the frequency domain within the uplink system band, and is composed of two UL PRBs located in different uplink slots. 1 PRACH is composed of 6 UL PRB pairs. For example, in FIG. 11, the UL PRB having the lowest frequency in the first uplink slot and the UL PRB having the highest frequency in the second uplink slot in the uplink subframe are used for the PUCCH. One PRB pair is configured. When the terminal device 5 is set not to perform simultaneous transmission of PUSCH and PUCCH, when the PUCCH resource and the PUSCH resource are allocated in the same uplink subframe, only the PUSCH resource is used. Send a signal. When the terminal device 5 is set to perform simultaneous transmission of PUSCH and PUCCH, when the PUCCH resource and the PUSCH resource are allocated in the same uplink subframe, the terminal device 5 basically has the PUCCH resource Signals can be transmitted using both PUSCH resources.

  DM RS is an uplink reference signal used for estimating propagation path fluctuations of signals arranged in PUSCH and PUCCH. The SRS is an uplink reference signal used for measurement of channel quality for PUSCH frequency scheduling and adaptive modulation of the base station apparatus 3 and measurement of synchronization deviation between the base station apparatus 3 and the terminal apparatus 5. For simplification of description, SRS is not shown in FIG. DM RS and SRS are defined by a sequence obtained by cyclically shifting a base sequence. For example, for a different terminal apparatus 5, a sequence obtained by cyclically shifting a base sequence using different cyclic shift values is used for DM RS. DM RSs are arranged in different SC-FDMA symbols depending on whether they are arranged in the same UL PRB as PUSCH or in the same UL PRB as PUCCH. The DM RS is a known signal in the communication system 1 that is used for estimating propagation path fluctuations of PUSCH and PUCCH.

  DM RS is arrange | positioned at the 4th SC-FDMA symbol in an uplink slot, when arrange | positioning in the same UL PRB as PUSCH. When the DM RS is arranged in the same UL PRB as the PUCCH including ACK / NACK, the DM RS is arranged in the third, fourth, and fifth SC-FDMA symbols in the uplink slot. DM RS is arrange | positioned at the 3rd, 4th, and 5th SC-FDMA symbol in an uplink slot, when arrange | positioning in the same UL PRB as PUCCH containing SR. When the DM RS is arranged in the same UL PRB as the PUCCH including the CQI, the DM RS is arranged in the second and sixth SC-FDMA symbols in the uplink slot.

  The SRS is arranged in the UL PRB determined by the base station apparatus 3, and the 14th SC-FDMA symbol in the uplink subframe (the seventh SC-FDMA symbol in the second uplink slot of the uplink subframe). ). The SRS can be arranged only in an uplink subframe (investigation reference signal subframe; referred to as SRS subframe) having a cycle determined by the base station apparatus 3 in the cell. For the SRS subframe, the base station apparatus 3 allocates a UL PRB to be allocated to the SRS, a period for transmitting the SRS for each terminal apparatus 5.

  Although FIG. 11 shows a case where the PUCCH is arranged in the UL PRB at the end in the frequency region of the uplink system band, the second, third, etc. UL PRB from the end of the uplink system band is used for the PUCCH. May be.

  In PUCCH, code multiplexing in the frequency domain and code multiplexing in the time domain are used. Code multiplexing in the frequency domain is processed by multiplying each code of the code sequence by a modulated signal modulated from uplink control information in subcarrier units. Code multiplexing in the time domain is processed by multiplying each code of the code sequence by a modulated signal modulated from uplink control information in units of SC-FDMA symbols. A plurality of PUCCHs are arranged in the same UL PRB, and different codes are assigned to the respective PUCCHs, and code multiplexing is realized in the frequency domain or the time domain by the assigned codes. In PUCCH (referred to as PUCCH format 1a or PUCCH format 1b) used for transmitting ACK / NACK, code multiplexing in the frequency domain and time domain is used. In PUCCH (referred to as PUCCH format 1) used for transmitting SR, code multiplexing in the frequency domain and time domain is used. In PUCCH (referred to as PUCCH format 2 or PUCCH format 2a or PUCCH format 2b) used for transmitting CQI, code multiplexing in the frequency domain is used.

  The PUSCH resource is an uplink subframe after a predetermined number (for example, 4) from the downlink subframe in which the EPDCCH resource including the uplink grant used for the allocation of the PUSCH resource is arranged in the time domain. Placed in. In the time domain, the PDSCH resource is arranged in the same downlink subframe as the downlink subframe in which the EPDCCH resource including the downlink assignment used for the allocation of the PDSCH resource is arranged. In the case of FDD (Frequency Division Duplex), the ACK / NACK for the transport block transmitted on the PUSCH is a downlink subframe after a predetermined number (for example, 4) from the uplink subframe in which the PUSCH resource is arranged. Are transmitted and received using EPHIICH.

  The terminal device 5 is configured (set) with an area (EPDCCH set, EPDCCH PRB set) in which EPDCCH may be arranged. A unit of mapping of resources constituting one EPDCCH is a set of a preset number of DL PRB pairs, and is one EPDCCH set. One or more EPDCCH sets may be configured for the terminal device 5. For example, one EPDCCH set is composed of two DL PRB pairs. For example, one EPDCCH set is composed of four DL PRB pairs. For example, one EPDCCH set is composed of 8 DL PRB pairs. Information indicating how many DL PRB pairs are configured in one EPDCCH set is notified from the base station apparatus 3 to the terminal apparatus 5. For example, two EPDCCH sets can be configured for the terminal device 5. When a plurality of EPDCCH sets are configured for the terminal device 5, each EPDCCH set may be configured from the same number of DL PRB pairs, or each EPDCCH set is configured from a different number of DL PRB pairs. May be. For each different terminal apparatus 5, an EPDCCH set composed of different DL PRB pairs may be configured, or an EPDCCH set composed of the same DL PRB pair may be configured, or some of them are different. , An EPDCCH set may be configured, part of which is composed of the same DL PRB pair. Moreover, EPDCCH set comprised from a different number of DL PRB pairs may be comprised with respect to each of the different terminal devices 5. FIG. The terminal device 5 performs a decoding process for detecting the EPDCCH in each of one or more configured EPDCCH sets.

  FIG. 12 is a diagram illustrating an example of a schematic configuration of the EPDCCH set of the communication system 1 according to the embodiment of the present invention. The base station apparatus 3 can configure (set, arrange) a plurality of EPDCCH sets (EPDCCH set 1, EPDCCH set 2, EPDCCH set 3) in the downlink system band. For example, one EPDCCH set is composed of four DL PRB pairs. For example, a plurality of DL PRB pairs constituting one EPDCCH set may be configured by DL PRB pairs dispersed in the frequency domain as shown in FIG. 12, or configured by DL PRB pairs that are continuous in the frequency domain. May be. In FIG. 12, each of EPDCCH set 1, EPDCCH set 2, and EPDCCH set 3 is composed of different DL PRB pairs.

  One EPDCCH is composed of one or more ECCEs (Enhanced Control Channel Elements). FIG. 13 is a diagram illustrating a logical relationship between EPDCCH and ECCE of the communication system 1 according to the embodiment of the present invention. The ECCE used between the base station device 3 and the terminal device 5 is assigned a number for identifying the ECCE. The ECCE numbering is performed based on a predetermined rule in the EPDCCH set. Here, ECCE t indicates the ECCE of ECCE number t. The EPDCCH is configured by an aggregation (ECCE Aggregation) composed of one or more ECCEs. The number of ECCEs constituting this set is hereinafter referred to as “ECCE aggregation number” (ECCE aggregation level). For example, the ECCE aggregation number configuring the EPDCCH is set in the base station apparatus 3 according to the coding rate set in the EPDCCH and the number of bits of DCI included in the EPDCCH. Further, a set of n ECCEs is hereinafter referred to as “ECCE aggregation n”.

  For example, the base station apparatus 3 configures one EPDCCH with one ECCE (ECCE aggregation 1), configures one EPDCCH with two ECCEs (ECCE aggregation 2), and four ECCEs. To configure one EPDCCH (ECCE aggregation 4), to configure one EPDCCH from eight ECCEs (ECCE aggregation 8), or to configure one EPDCCH from sixteen ECCEs (ECCE aggregation) 16) One EPDCCH is configured by 32 ECCEs (ECCE aggregation 32). For example, the base station apparatus 3 uses an ECCE aggregation number with a small number of ECCEs constituting the EPDCCH for the terminal apparatus 3 having a good channel quality, and the ECCEs constituting the EPDCCH for the terminal apparatus 3 having a poor channel quality. Use a large number of ECCE aggregation numbers. Also, for example, when transmitting DCI with a small number of bits, the base station apparatus 3 uses an ECCE aggregation number with a small number of ECCEs constituting the EPDCCH, and when transmitting a DCI with a large number of bits, the ECCEs constituting the EPDCCH Use a large number of ECCE aggregation numbers.

  In FIG. 13, those indicated by diagonal lines mean EPDCCH candidates. The EPDCCH candidate (EPDCCH candidate) is a target on which the terminal device 5 performs decoding detection of the EPDCCH, and the EPDCCH candidate is configured independently for each ECCE aggregation number. Each EPDCCH candidate configured for each ECCE aggregation number is configured by one or more different ECCEs. The number of EPDCCH candidates is set independently for each ECCE aggregation number. An EPDCCH candidate configured for each ECCE aggregation number is configured of ECCEs having consecutive numbers. The terminal device 5 performs EPDCCH decoding detection on the number of EPDCCH candidates set for each ECCE aggregation number. Note that when the terminal device 5 determines that the EPDCCH addressed to the terminal device 5 has been detected, the terminal device 5 does not have to detect (stop) the EPDCCH decoding detection for a part of the set EPDCCH candidates.

  The number of ECCEs configured with one EPDCCH set depends on the number of DL PRB pairs that configure the EPDCCH set. For example, the amount of resources (number of resource elements) supported by one ECCE is a resource (second reference signal) that cannot be used for EPDCCH signals from resources obtained by dividing one DL PRB pair resource into four. ) Is almost equal to the amount of resources. For example, 16 ECCEs are configured in an EPDCCH set including 4 DL PRB pairs. For example, in an EPDCCH set composed of two DL PRB pairs, eight ECCEs are configured. For example, 32 ECCEs are configured in an EPDCCH set including 8 DL PRB pairs.

  Two types of methods are used as a mapping method of resources constituting the EPDCCH. These are called Localized mapping and Distributed mapping. Transmission of EPDCCH using a resource configured by Localized mapping is referred to as Localized transmission. Transmission of EPDCCH using a resource configured by distributed mapping is referred to as “Distributed transmission”.

  Localized mapping is a method in which one ECCE is mapped to resources in one DL PRB pair. Distributed mapping is a method in which one ECCE is mapped to a plurality of DL PRB pair resources. More specifically, with respect to EREG (Enhanced Resource Element Group) described later, in localized mapping, one ECCE is composed of multiple EREGs in one DL PRB pair, and in distributed mapping, one ECCE is in multiple DL PRB pairs. The plurality of EREGs.

  FIG. 14 is a diagram illustrating an example of the configuration of the EREG according to the embodiment of this invention. Here, one DL PRB pair is shown. In FIG. 14, one grid corresponds to one RE. In this figure, the vertical axis represents the frequency domain, and the horizontal axis represents the time domain. In one DL PRB pair, 168 REs are configured. 24 REs are configured for the second reference signal. The EREG is configured using an RE obtained by excluding an RE configured for the second reference signal from an RE configured in one DL PRB pair. Here, EREG is configured using 144 REs in one DL PRB pair. FIG. 14 shows a case where 16 EREGs are configured by one DL PRB pair. Here, one EREG is composed of 9 REs obtained by dividing 144 REs into 16 equal parts.

  Details of nine REs constituting one EREG will be described. In the DL PRB pair, the numbering starts from the RE composed of the subcarrier with the lowest frequency and the OFDM symbol with the earliest time. Next, numbering is sequentially performed on the RE in the frequency direction, and when numbering is performed on the RE configured of the subcarrier having the highest frequency in the OFDM symbol, the next OFDM symbol and the frequency are Numbering continues for the RE composed of the lowest subcarrier. The same processing as described above is performed for an RE composed of different subcarriers and the remaining RE composed of different OFDM symbols, and composed of an OFDM symbol with the slowest time and a subcarrier with the highest frequency. Numbering is performed up to RE. Here, the RE configured for the second reference signal is skipped and the REs for configuring the EREG are numbered. The numbers start from ‘0’, ‘1’, ‘2’, ‘3’, ‘4’, ‘5’, ‘6’, ‘7’. Numbering is performed in the order of “8”, “9”, “10”, “11”, “12”, “13”, “14”, “15”. The numbering is repeated from “0” again. One EREG is composed of nine REs having the same number. For example, EREG0 is composed of 9 REs numbered '0', EREG1 is composed of 9 REs numbered '1', and EREG2 is numbered '2'. EREG3 is composed of 9 REs numbered '3', EREG4 is composed of 9 REs numbered '4', and EREG5 is' It is composed of 9 REs numbered 5 ', EREG6 is composed of 9 REs numbered' 6 ', and EREG7 is 9 REs numbered' 7 '. EREG8 is composed of 9 REs numbered '8', EREG9 is composed of 9 REs numbered '9', and EREG10 is numbered '10' It is composed of nine attached REs, and EREG11 is' It is composed of 9 REs numbered 1 ', EREG 12 is composed of 9 REs numbered' 12 ', and EREG 13 is 9 REs numbered' 13 '. EREG14 is composed of 9 REs numbered '14', EREG15 is composed of 9 REs numbered '15', and EREG16 is numbered '16' It consists of nine attached REs.

  Although EREG is configured as shown in FIG. 14, an EPDCCH signal is not arranged in another signal, for example, an RE in which CSI-RS is arranged. Therefore, in the EPDCCH signal transmission / reception process, the rate matching process and the derate matching process are performed by the base station apparatus 3 and the terminal apparatus according to the number of bits that can be transmitted / received by the EREG resource excluding the RE in which the CSI-RS is arranged. Done at 5.

  FIG. 15 is a diagram illustrating an example of localized mapping according to the embodiment of this invention. Here, one EPDCCH set is composed of four DL PRB pairs (DL PRB pair W, DL PRB pair X, DL PRB pair Y, DL PRB pair Z), and 16 within one DL PRB pair. EREG (EREG0, EREG1, EREG2, EREG3, EREG4, EREG5, EREG6, EREG7, EREG8, EREG9, EREG10, EREG11, EREG12, EREG13, EREG14, EREG15) is composed of 16 EPDCE setC , ECCE1, ECCE2, ECCE3, ECCE4, ECCE5, ECCE6, ECCE7, ECCE8, ECCE9, ECCE10, ECCE11, ECCE12, EC E13, ECCE14, ECCE15) shows a case is constructed.

  EREG is an element having a smaller amount of resources than ECCE, and one ECCE is composed of a plurality of EREGs. For example, one ECCE is composed of four EREGs. A number for identifying each EREG is referred to as an EREG index. A number for identifying each ECCE is called an ECCE index.

  For example, in FIG. 15, each DL PRB pair corresponds to each DL PRB pair constituting an EPDCCH set shown in FIG. 12. Each ECCE is composed of a plurality of different EREGs. For example, ECCE is composed of resources in which four EREGs of one DL PRB pair are collected. In FIG. 15, one block (a block composed of four ECCEs having consecutive numbers) (a block composed of ECCE0, ECCE1, ECCE2, and ECCE3, a block composed of ECCE4, ECCE5, ECCE6, and ECCE7, ECCE8, and A block composed of ECCE9, ECCE10, and ECCE11, and a block composed of ECCE12, ECCE13, ECCE14, and ECCE15) means one DL PRB pair resource.

  One ECCE configured by applying the localized mapping is configured by a plurality of EREGs in the same DL PRB pair. In FIG. 15, ECCE0 is composed of ERG0, EREG4, EREG8, and EREG12 of DL PRB pair W, ECCE1 is composed of EREG1, EREG5, EREG9, and EREG13 of DL PRB pair W, and ECCE2 is DL PRBp of GPR2E. ECCE3 is composed of EREG3, EREG7, EREG11, and EREG15 of DL PRB pair W, ECCE4 is composed of EREG0, EREG4, EREG12, and EREG12 of DL PRB pair X. Is composed of EREG1, EREG5, EREG9, and EREG13 of DL PRB pair X, and ECCE6 is DL PRB pair. EREG2, EREG6, EREG10 and EREG14, ECCE7 is composed of DL PRB pair X EREG3, EREG7, EREG11 and EREG15, and ECCE8 is composed of DL PRB pair Y EREG0, EREG4, EREG8, EREG8, EREG8, EREG8, EREG8 ECCE9 is composed of DL PRB pair Y EREG1, EREG5, EREG9, and EREG13, ECCE10 is composed of DL PRB pair Y EREG2, EREG6, EREG10, and EREG14, and ECCE11 is DL PRYEREG7 It consists of EREG11 and EREG15, and ECCE12 consists of EREG0, EREG4 and EREG8 of DL PRB pair Z. ECCE13 is composed of EREG1, EREG5, EREG9, and EREG13 of DL PRB pair Z, ECCE14 is composed of EREG2, EREG6, EREG10, and EREG14 of DL PRB pair Z, and ECCB15p is PRB15p. EREG3, EREG7, EREG11, and EREG15.

  In FIG. 15, physically, the horizontal axis does not mean the frequency domain and the vertical axis does not mean the time domain, but one DL PRB pair is conceptually divided into 16 resources. EREG is configured, and one ECCE is configured from four EREGs. In FIG. 15, it does not mean that all resources in the DL PRB pair are configured as ECCE. For example, the resource in which the second reference signal is arranged is excluded in advance from the resources configuring the EREG. The

  FIG. 16 is a diagram illustrating an example of localized mapping according to the embodiment of this invention. Here, one EPDCCH set includes eight DL PRB pairs (DL PRB pair S, DL PRB pair T, DL PRB pair U, DL PRB pair V, DL PRB pair W, DL PRB pair X, DL PRB pair X, DL PRB pair X, DL PRB pair X, DL PRB pair X, DL PRB pair X, DL PRB pair X, DL PRB pair X DL PRB pair Z), and 16 EREGs (EREG0, EREG1, EREG2, EREG3, EREG4, EREG5, EREG6, EREG7, EREG8, EREG9, EREG11, EREG13, EREG13, EREG13, EREG13, EREG13, EREG13, EREG13, EREG13, EREG13, EREG14, EREG15) are configured, and 32 ECCEs (ECCE0, ECCE1, ECCE2, ECCE3, ECCE4, E) in one EPDCCH set CE5, ECCE6, ECCE7, ECCE8, ECCE9, ECCE10, ECCE11, ECCE12, ECCE13, ECCE14, ECCE15, ECCE16, ECCE17, ECCE18, ECCE19, ECCE20, ECCE21, ECCE22, ECC24, ECC25, ECC25, ECC25, ECC25 The case where ECCE30 and ECCE31) are configured will be described.

  In FIG. 16, one block (a block composed of four ECCEs having consecutive numbers) (a block composed of ECCE0, ECCE1, ECCE2, and ECCE3, a block composed of ECCE4, ECCE5, ECCE6, and ECCE7, ECCE8, and Mass composed of ECCE9, ECCE10, and ECCE11, Mass composed of ECCE12, ECCE13, ECCE14, and ECCE15, Mass composed of ECCE16, ECCE17, ECCE18, and ECCE19, and Structure composed of ECCE20, ECCE21, ECCE22, and ECCE23 Of a single DL PRB pair, a mass composed of ECCE24, ECCE25, ECCE26 and ECCE27, a mass composed of ECCE28, ECCE29, ECCE30 and ECCE31). Means a resource.

  In FIG. 16, ECCE0 is composed of EREG0, EREG4, EREG8, and EREG12 of DL PRB pair S, ECCE1 is composed of EREG1, EREG5, EREG9, and EREG13 of DL PRB pair S, and ECCE2 is composed of DL PRBp ECCE3 is composed of EREG3, EREG7, EREG11, and EREG15 of DL PRB pair S, ECCE4 is composed of EREG0, EREG4, EREG12, and EREG12 of DL PRB pair T. Is composed of EREG1, EREG5, EREG9 and EREG13 of DL PRB pair T, and ECCE6 is DL PRB pair. EREG2, EREG6, EREG10 and EREG14, ECCE7 consists of DL PRB pair T EREG3, EREG7, EREG11 and EREG15, ECCE8 consists of DL PRB pair U EREG0, EREG8, EREG8, EREG8, EREG8, EREG8 , ECCE9 is composed of DL PRB pair U EREG1, EREG5, EREG9 and EREG13, ECCE10 is composed of DL PRB pair U EREG2, EREG6, EREG10 and EREG14, and ECCE11 is DL PRB EREG 7G It consists of EREG11 and EREG15, and ECCE12 consists of EREG0, EREG4 and EREG8 of DL PRB pair V. ECCE13 is composed of DL PRB pair V EREG1, EREG5, EREG9 and EREG13, ECCE14 is composed of DL PRB pair V EREG2, EREG6, EREG10 and EREG14, and ECCB15p is PRB15p. EREG3, EREG7, EREG11, and EREG15. ECCE16 consists of DL PRB pair S, EREG0, EREG4, EREG8, and EREG12. ECCE17 consists of DL PRB pair W, EREG1, EREG5, EREG13, EREG13, ECCE18 is composed of DL PRB pair W EREG2, EREG6, EREG10, and EREG14, and ECCE1 9 is composed of EPR3, EREG7, EREG11, and EREG15 of DL PRB pair W, ECCE20 is composed of EREG0, EREG4, EREG8, and EREG12 of DL PRB pair X, and ECCE21 is composed of DL PRB pair EREG1 and GREG1 ECCE22 is composed of EREG2, EREG6, EREG10, and EREG14 of DL PRB pair X, ECCE23 is composed of EREG3, EREG7, EREG11, and EREG15 of DL PRB pair X. It consists of EREG0, EREG4, EREG8, and EREG12 of Y, and ECCE25 is ERE of DL PRB pair Y 1 is composed of EREG5, EREG9, and EREG13, ECCE26 is composed of ERG2, EREG6, EREG10, and EREG14 of DL PRB pair Y, ECCE27 is composed of EREG3, EREG7, EREG7, EREG11, and EREG11 of DL PRB pair Y ECCE28 is composed of ERG0, EREG4, EREG8, and EREG12 of DL PRB pair Z, ECCE29 is composed of EREG1, EREG5, EREG9, and EREG13 of DL PRB pair Z, and ECCE30 is composed of DL PRB EREG, EREG10, and EREG13. And ECCE31 are DL PRB pair Z EREG3, EREG7, EREG11, and ER. Consisting of G15 Metropolitan.

  FIG. 17 is a diagram illustrating an example of localized mapping according to the embodiment of this invention. Here, one EPDCCH set is composed of two DL PRB pairs (DL PRB pair Y, DL PRB pair Z), and 16 EREGs (EREG0, EREG1, EREG2, EREG3, one DL PRB pair) EREG4, EREG5, EREG6, EREG7, EREG8, EREG9, EREG10, EREG11, EREG12, EREG13, EREG14, EREG15) are configured, and 8 ECCEs in one EPDCCH set (ECCE0, ECCE1, ECE3EC, CCE , ECCE6, ECCE7) are shown.

  In FIG. 17, one block (a block composed of four ECCEs having consecutive numbers) (a block composed of ECCE0, ECCE1, ECCE2, and ECCE3, a block composed of ECCE4, ECCE5, ECCE6, and ECCE7) is 1 It means one DL PRB pair resource.

  In FIG. 17, ECCE0 is composed of EREG0, EREG4, EREG8, and EREG12 of DL PRB pair Y, ECCE1 is composed of EREG1, EREG5, EREG9, and EREG13 of DL PRB pair Y, and ECCE2 is DL PRBp of GPR2E. ECCE3 is composed of ERG3, EREG7, EREG11, and EREG15 of DL PRB pair Y, ECCE4 is composed of EREG0, EREG4, EREG12, and EREG12 of DL PRB pair Z. Is composed of ERG1, EREG5, EREG9 and EREG13 of DL PRB pair Z, and ECCE6 is DL PRB pair. Consists EREG2 the EREG6 and EREG10 and EREG14 Prefecture, ECCE7 consists DL PRB pair EREG3 of Z and EREG7 and EREG11 and EREG15 Prefecture.

  FIG. 18 is a diagram illustrating an example of Distributed mapping according to the embodiment of this invention. Here, one EPDCCH set is composed of four DL PRB pairs (DL PRB pair W, DL PRB pair X, DL PRB pair Y, DL PRB pair Z), and 16 within one DL PRB pair. EREG (EREG0, EREG1, EREG2, EREG3, EREG4, EREG5, EREG6, EREG7, EREG8, EREG9, EREG10, EREG11, EREG12, EREG13, EREG14, EREG15) is composed of 16 EPDCE setC , ECCE1, ECCE2, ECCE3, ECCE4, ECCE5, ECCE6, ECCE7, ECCE8, ECCE9, ECCE10, ECCE11, ECCE12, EC E13, ECCE14, ECCE15) shows a case is constructed.

  One ECCE configured by applying distributed mapping is configured by a plurality of EREGs in different DL PRB pairs.

  18, ECCE0 is composed of EREG0 of DL PRB pair W, EREG4 of DL PRB pair X, EREG8 of DL PRB pair Y, and EREG12 of DL PRB pair Z, and ECCE1 is composed of EPR12 of DL PRB pair BREB It consists of EREG0 of X, EREG4 of DL PRB pair Y, and EREG8 of DL PRB pair Z, ECCE2 is EREG8 of DL PRB pair W, EREG12 of DL PRB pair X, and PR PRa G The ECE4 is composed of EREG4 of DL PRB pair W, EREG8 of DL PRB pair X, and DL PRB pair. EREG12 and EPR0 of DL PRB pair Z, ECCE4 is composed of EREG1 of DL PRB pair W, EREG5 of DL PRB pair X, EREG9 of DL PRB pair Y, and EPR9 of DL PRB pair Z It consists of EREG13 of DL PRB pair W, EREG1 of DL PRB pair X, EREG5 of DL PRB pair Y, EREG9 of DL PRB pair Z, ECE9 of DL PRB pair W, EPR9p of DL PRB pair W, EPR9p of DL PRB pair W It consists of EREG1 of pair Y and EREG5 of DL PRB pair Z. ECCE7 is EREG5 and DL P of DL PRB pair W. It consists of EREG9 of RB pair X, EREG13 of DL PRB pair Y, and EREG1 of DL PRB pair Z, ECCE8 is EREG2 of DL PRB pair W, EREG6 of DL PRB pir X, and PR PR Gp of DL PRB pair X The ECCE9 is composed of EREG14 of DL PRB pair W, EREG2 of DL PRB pair X, EREG6 of DL PRB pair Y, and EREG10 of DL PRB pair Z. ECCE10 is composed of ERG10 of DL PRB pair Z. And DL PRB pair X EREG14, DL PRB pair Y EREG2 and DL PRB pair Z EREG6 ECCE11 is composed of EREG6 of DL PRB pair W, EREG10 of DL PRB pair X, EREG14 of DL PRB pair Y, and EREG2 of DL PRB pair Z, and CECE12 is composed of DL PRB pair X EREG7 is composed of EREG11 of DL PRB pair Y and EREG15 of DL PRB pair Z. ECCE13 is EREG15 of DL PRB pair W, EREG3 of DL PRB pair X and EREG3 of DL PRB pair Y and EPR15 of DL PRB pair Y ECCE14 is composed of EREG11 of DL PRB pair W, EREG15 of DL PRB pair X, and DL PRB pa. It is composed of EREG3 of ir Y and EREG7 of DL PRB pair Z, and ECCE15 is composed of EREG7 of DL PRB pair W, EREG11 of DL PRB pair X, EREG15 of DL PRB pair Y, and DL PRZ EREG .

  In FIG. 18, physically, the horizontal axis does not mean the frequency domain and the vertical axis does not mean the time domain, but one DL PRB pair is conceptually divided into 16 EREGs, and 4 different ones. It shows that one ECCE is composed of four EREGs of DL PRB pair. In FIG. 18, it does not mean that all the resources in the DL PRB pair are configured as EREG. For example, the resource in which the second reference signal is arranged is excluded in advance from the resources configuring the EREG. The

  FIG. 19 is a diagram illustrating an example of Distributed mapping according to the embodiment of this invention. Here, one EPDCCH set includes eight DL PRB pairs (DL PRB pair S, DL PRB pair T, DL PRB pair U, DL PRB pair V, DL PRB pair W, DL PRB pair X, DL PRB pair X, DL PRB pair X, DL PRB pair X, DL PRB pair X, DL PRB pair X, DL PRB pair X, DL PRB pair X DL PRB pair Z), and 16 EREGs (EREG0, EREG1, EREG2, EREG3, EREG4, EREG5, EREG6, EREG7, EREG8, EREG9, EREG11, EREG13, EREG13, EREG13, EREG13, EREG13, EREG13, EREG13, EREG13, EREG13, EREG14, EREG15) are configured, and 32 ECCEs (ECCE0, ECCE1, ECCE2, ECCE3, ECCE4, E) in one EPDCCH set CE5, ECCE6, ECCE7, ECCE8, ECCE9, ECCE10, ECCE11, ECCE12, ECCE13, ECCE14, ECCE15, ECCE16, ECCE17, ECCE18, ECCE19, ECCE20, ECCE21, ECCE22, ECC24, ECC25, ECC25, ECC25, ECC25 The case where ECCE30 and ECCE31) are configured will be described.

  In FIG. 19, ECCE0 is composed of EREG0 of DL PRB pair S, EREG4 of DL PRB pair U, EREG8 of DL PRB pair W, and EREG12 of DL PRB pair Y, and ECCE1 is composed of DL PRB pair BREGG It consists of EREG4 of V, EREG8 of DL PRB pair X and EREG12 of DL PRB pair Z, ECCE2 is EREG12 of DL PRB pair S, EREG0 of DL PRB pair U and DL PRB pair GRE BRE GRE The ECE8 is composed of EREG8 of DL PRB pair T, EREG0 of DL PRB pair V and DL PRB pair. EREG4 of X and EREG8 of DL PRB pair Z, ECCE4 is composed of EREG8 of DL PRB pair S, EREG12 of DL PRB pair U, EREG0 of DL PRB pair W and EPR0 of DL PRB pair C Is composed of EREG8 of DL PRB pair T, EREG12 of DL PRB pair V, EREG0 of DL PRB pair X, and EREG4 of DL PRB pair Z. ECCE6 is EREG4 of DL PRB pair S and EREG4 of DL PRB pair S. It consists of EREG12 of PRB pair W and EREG0 of DL PRB pair Y, and ECCE7 is EREG4 and DL P of DL PRB pair T. It consists of EREG8 of RB pair V, EREG12 of DL PRB pair X, and EREG0 of DL PRB pair Z. ECCE8 is EREG1 of DL PRB pair S, EREG5 and PRrp of DL PRB pair U. The ECCE9 is composed of EREG1 of DL PRB pair T, EREG5 of DL PRB pair V, EREG9 of DL PRB pair X and EREG13 of DL PRB pair Z, and ECC B10 is composed of ERG13 of DL PRB pair Z. And DL PRB pair U EREG1, DL PRB pair W EREG5, and DL PRB pair Y EREG9. CCE11 is composed of EREG13 of DL PRB pair T, EREG1 of DL PRB pair V, EREG5 of DL PRB pair X, and EREG9 of DL PRB pair Z, EREG of DL PRB pair S It consists of EREG1 of DL PRB pair W and EREG5 of DL PRB pair Y. ECCE13 consists of EREG9 of DL PRB pair T, EREG13 of DL PRB pair V, and EREG1 of DL PRB pair X. ECCE14 is EREG5 of DL PRB pair S, EREG9 of DL PRB pair U and ERE of DL PRB pair W. 13 and DL PRB pair Y EREG1; ECCE15 is DL PRB pair T EREG5, DL PRB pair V EREG9 and DL PRB pair X EREG13 and DL PRB pair Z EREG1 It consists of EREG2 of PRB pair S, EREG6 of DL PRB pair U, EREG10 of DL PRB pair W, and EREG14 of DL PRB pair Y, and ECCE17 is EREG2 of DL PRB pair T and EPR2 of DL PRB pair T It consists of EREG10 of X and EREG14 of DL PRB pair Z. ECCE18 is composed of EREG14 and D of DL PRB pair S. It consists of EREG2 of PRB pair U, EREG6 of DL PRB pair W, and EREG10 of DL PRB pair Y, ECCE19 is EREG14 of DL PRB pair T, EPR2 of DL PRB pair E and PRrP of DL PRB pair V The ECE 10 is composed of the EREG 10 of the DL PRB pair S, the EREG 14 of the DL PRB pair U, the EREG 2 of the DL PRB pair W, and the EREG 6 of the DL PRB pair Y. And DL PRB pair V EREG14, DL PRB pair X EREG2 and DL PRB pair Z EREG6 ECCE22 is composed of EREG6 of DL PRB pair S, EREG10 of DL PRB pair U, EREG14 of DL PRB pair W, and EREG2 of DL PRB pair Y, and ECCE23 is composed of EPR2 of DL PRB pair It consists of EREG10 of V, EREG14 of DL PRB pair X, and EREG2 of DL PRB pair Z, ECCE24 is EREG3 of DL PRB pair S, EREG7 of DL PRB pair U, and PR PRa P The ECCE25 is composed of EREG3 of DL PRB pair T and EREG7 of DL PRB pair V and DL PRB. It consists of EREG11 of pair X and EREG15 of DL PRB pair Z. ECCE26 is composed of EREG15 of DL PRB pair S, EREG3 of DL PRB pair U, EREG7 of DL PRB pair W, and GPRPRE of DL PRB pair. ECCE27 is composed of EREG15 of DL PRB pair T, EREG3 of DL PRB pair V, EREG7 of DL PRB pair X and EREG11 of DL PRB pair Z, and EREG15 of DL PRB pair S It consists of EREG3 of DL PRB pair W and EREG7 of DL PRB pair Y. ECCE29 is DL PRB pair. It consists of EREG11 of T, EREG15 of DL PRB pair V, EREG3 of DL PRB pair X, and EREG7 of DL PRB pair Z, ECCE30 is EREG7 of DL PRB pair S and EPR7 of DL PRB pair U ECCE31 is composed of EREG15 of DL PRB pair T, EREG11 of DL PRB pair V, EREG15 of DL PRB pair X, and EREG15 of DL PRB pair Z.

  FIG. 20 is a diagram illustrating an example of Distributed mapping according to the embodiment of this invention. Here, one EPDCCH set is composed of two DL PRB pairs (DL PRB pair Y, DL PRB pair Z), and 16 EREGs (EREG0, EREG1, EREG2, EREG3, one DL PRB pair) EREG4, EREG5, EREG6, EREG7, EREG8, EREG9, EREG10, EREG11, EREG12, EREG13, EREG14, EREG15) are configured, and 8 ECCEs in one EPDCCH set (ECCE0, ECCE1, ECE3EC, CCE , ECCE6, ECCE7) are shown.

  In FIG. 20, ECCE0 is composed of EREG0 of DL PRB pair Y, EREG4 of DL PRB pair Z, EREG8 of DL PRB pair Y, and EREG12 of DL PRB pair Z, and ECCE1 is composed of EPR12 of DL PRB pair It consists of EREG0 of Z, EREG4 of DL PRB pair Y, and EREG8 of DL PRB pair Z, ECCE2 is EREG1 of DL PRB pair Y, EREG5 of DL PRB pair Z, and PR PR ECCE3 is composed of EREG13 of DL PRB pair Y and EREG1 of DL PRB pair Z and DL PRB pair. It is composed of EREG5 of Y and EREG9 of DL PRB pair Z, ECCE4 is composed of EREG2 of DL PRB pair Y, EREG6 of DL PRB pair Z, EREG10 of DL PRB pair Y, and DL PRB pair Z Is composed of EREG14 of DL PRB pair Y, EREG2 of DL PRB pair Z, EREG6 of DL PRB pair Y, and EREG10 of DL PRB pair Z, and ECCE6 is EREG3 of DL PRB pair Y and EREG3 of DL PRB pair Y It consists of EREG11 of PRB pair Y and EREG15 of DL PRB pair Z. ECCE13 is EREG1 of DL PRB pair Y. And composed of DL PRB pair Z of EREG3 and DL PRB pair Y EREG7 and DL PRB pair Z EREG11 Metropolitan of.

  The localized EPDCCH is composed of one ECCE (ECCE aggregation 1), or two ECCEs (ECCE aggregation 2), or four ECCEs (ECCE aggregation 4), or eight ECCEs. (ECCE aggregation 8) or 16 ECCEs (ECCE aggregation 16). A localized EPDCCH having an ECCE aggregation number of 2 or more is composed of a plurality of ECCEs having consecutive ECCE numbers. The distributed EPDCCH is composed of one ECCE (ECCE aggregation 1), or two ECCEs (ECCE aggregation 2), or four ECCEs (ECCE aggregation 4), or eight ECCEs. (ECCE aggregation 8), 16 ECCEs (ECCE aggregation 16), or 32 ECCEs (ECCE aggregation 32). A distributed EPDCCH having an ECCE aggregation number of 2 or more is composed of a plurality of ECCEs having consecutive ECCE numbers.

  An EPDCCH set composed of a common DL PRB pair can be commonly set for a plurality of terminal apparatuses 5. Different EPDCCHs are transmitted / received to / from different terminal devices 5 using different ECCEs of the EPDCCH set. An EPDCCH set composed of a common DL PRB pair is set in common, but different resource mapping methods are applied to different terminal apparatuses 5, and distributed EPDCCH and Localized for different terminal apparatuses 5 in the EPDCCH set. When the EPDCCH is transmitted / received, the EREG in which the Distributed EPDCCH is transmitted / received is different from the EREG in which the Localized EPDCCH is transmitted / received. From the viewpoint of the terminal device 5, assuming that any resource mapping method is applied to a configured EPDCCH set, the EPDCCH is received, demodulated, and decoded. From the viewpoint of the base station apparatus 3, it may be determined that any one type of resource mapping method is applied to a configured EPDCCH set, and a plurality of EPDCCHs may be arranged and transmitted. It may be determined that both two types of resource mapping methods are applied to a configured EPDCCH set, and a plurality of EPDCCHs are arranged and transmitted.

  The terminal device 5 is specified (set, configured) to perform processing (monitoring) for detecting the EPDCCH in the EPDCCH set configured by the base station device 3. The designation of monitoring of the EPDCCH may be automatically (implicitly) performed by configuring the EPDCCH set in the terminal device 5, or may be explicitly performed by signaling different from the signaling indicating the configuration of the EPDCCH set. May be. For example, the base station apparatus 3 notifies the terminal apparatus 5 of information indicating a downlink subframe in which the terminal apparatus 5 performs EPDCCH monitoring. The terminal device 5 does not perform the process of detecting the EPDCCH for all ECCEs in the EPDCCH set, but performs the process of detecting the EPDCCH for the limited ECCE. For each ECCE aggregation number, an EPDCCH candidate for detecting the EPDCCH is set. The terminal device 5 recognizes which one or more EPDCCH candidates in the EPDCCH set are to be decoded and detected based on the identifier (RNTI) assigned to the terminal device 5.

  Information indicating the configuration (designation, setting) of the EPDCCH set is exchanged between the base station apparatus 3 and the terminal apparatus 5 before starting communication using the EPDCCH. For example, the information is performed using RRC (Radio Resource Control) signaling. Specifically, the terminal device 5 receives information indicating the position (assignment) of the DL PRB pair of the EPDCCH set from the base station device 3. Also, information indicating the type of ECCE resource mapping (Localized mapping, Distributed mapping) is notified from the base station apparatus 3 to the terminal apparatus 5 for each EPDCCH set.

  The terminal device 5 demodulates the EPDCCH signal using the second reference signal received in the EPDCCH set set by the base station device 3, and performs a process of detecting the EPDCCH addressed to itself. For example, the terminal apparatus 5 performs demodulation of the EPDCCH signal using the second reference signal in the DL PRB pair to which the resource in which the signal to be demodulated is allocated. The EREG is previously associated with one of the antenna ports, and the terminal apparatus 5 demodulates the EPDCCH signal using the second reference signal corresponding to the antenna port determined based on the EREG constituting the EPDCCH. Do. In the EPDCCH set to which the localized mapping is applied and the EPDCCH set to which the distributed mapping is applied, different associations are used with respect to the association between the EREG in the DL PRB pair and the antenna port. In an EPDCCH set to which localized mapping is applied, one EREG is associated with a single antenna port. In an EPDCCH set to which distributed mapping is applied, one EREG is associated with a plurality of antenna ports, and different antenna ports are associated with each RE in the EREG alternately. For example, different antenna ports are alternately associated with each RE in the EREG in the order of antenna port 107, antenna port 109, antenna port 107, and antenna port 109.

  Below, the control signal mapped by EPDCCH is demonstrated. A signal mapped to the EPDCCH is processed for each control information (DCI) for one terminal apparatus 5, and a scramble process, a modulation process, a layer mapping process, a precoding process, and the like can be performed. The signal mapped to the EPDCCH is subjected to common precoding processing together with the second reference signal.

  Further, the second reference signal is multiplexed by the base station apparatus 3 in the DL PRB pair in which the EPDCCH is arranged. The terminal device 5 demodulates the EPDCCH signal using the second reference signal. As the second reference signal used for the demodulation of the EPDCCH, the second reference signal of the antenna port corresponding to the EREG or ECCE constituting the EPDCCH is used. The antenna ports corresponding to EREG and ECCE of the EPDCCH set are set in advance.

  For example, two EPDCCH sets (EPDCCH set1, EPDCCH set2) are configured for the terminal device 5. In the terminal device 5, a search space is set in each EPDCCH set. The search space means a logical area in which the terminal device 5 performs decoding detection of the EPDCCH in the EPDCCH set. The Search space is composed of a plurality of EPDCCH candidates. The EPDCCH candidate is a target on which the terminal device 5 performs decoding detection of the EPDCCH. For each ECCE aggregation number, different EPDCCH candidates are composed of different ECCEs (including one ECCE and a plurality of ECCEs).

  A plurality of Search spaces are set in the terminal device 5 in which a plurality of EPDCCH sets are configured. For example, distributed mapping is applied to some EPDCCH sets of a plurality of EPDCCH sets configured in the terminal device 5, and localized mapping is applied to different partial EPDCCH sets. For example, distributed mapping is applied to all of a plurality of EPDCCH sets configured in the terminal device 5. For example, the localized mapping is applied to all the plurality of EPDCCH sets configured in the terminal device 5.

  The EPHIICH of the present invention uses the same structure as EREG and ECCE described above. The EREG described in FIG. 14 is used for the configuration of the EPHIICH of the present invention. For the configuration of the EPHCIH of the present invention, the ECCE described in FIGS. 18, 19, and 20, that is, the distributed mapping ECCE is used. For the configuration of EPHIICH, EREG and ECCE in an EPDCCH set set for EPDCCH may be used. For example, the base station apparatus 3 may notify the terminal apparatus 5 that the EPHICH is also arranged in a part of the EPDCCH set to which the distributed mapping is applied, which is set for the terminal apparatus 5. A plurality of DL PRB pairs are set independently of the EPDCCH set set for the EPDCCH, EREG and ECCE are configured in the plurality of DL PRB pairs, and the EREG and ECCE are used for the configuration of EPHICH. May be. A plurality of DL PRB pairs are configured as an area (EPHIICH set) in which EPHICH may be arranged. For example, a plurality of DL PRB pairs used in the configuration of EPHIICH, in other words, a plurality of DL PRB pairs in which EPHICH can be arranged, are directly notified from the base station apparatus 3 to the terminal apparatus 5 using signaling. The For example, the EPHICH set is composed of a plurality of DL PRB pairs separated in the frequency domain, like the EPDCCH set shown in FIG.

  One EPHIICH is composed of a plurality of ECCEs. In one EPHIICH, a signal generated from a plurality of ACK / NACK information can be arranged. For example, a signal generated from 8 pieces of ACK / NACK information can be arranged in one EPHIICH. Multiple EPHICHs can be arranged in one downlink subframe. Depending on the total number of UL PRB pairs in the uplink system band, the number of PHICHs that can be arranged in one downlink subframe, in other words, the number of ACK / NACK information may be controlled. For example, when the total number of UL PRB pairs in the uplink system band is 110, 14 EPHICHs may be arranged in the EPHICH set in one downlink subframe, and 110 ACK / NACK information There is a possibility that the signal generated from Furthermore, independent signaling may be used to control the number of EPHICHs that can be placed in the EPHICH set in one downlink subframe, in other words, the number of ACK / NACK information in the EPHICH set. For example, the total number of UL PRB pairs in the uplink system band is used as one reference, and the number of ACK / NACK information of 1/6 times, 1/2 times, 1 time, and 2 times the number of the reference is used. Controlled and information indicating the multiple is notified from the base station apparatus 3 to the terminal apparatus 5 using RRC signaling. For example, when the total number of UL PRB pairs is 110 and 1/6 times is indicated by RRC signaling, a signal generated from 19 ACK / NACK information may be placed in the EPHICH set. There is a possibility that three EPHIICHs are arranged in the EPHICH set.

  In addition, the number of EPHICHs that can be configured in one EPHICH set is fixed, and the number of configured EPHIICH sets is controlled, in other words, the number of EPHICHs that can be arranged in one downlink subframe, in other words, ACK / NACK The number may be controlled. For example, when the number of EPHICHs configured in one EPHIICH set is four, the number of EPHICHs that can be arranged in one downlink subframe is controlled to four when one EPHIICH set is configured. When one EPHIICH set is configured, the number of EPHICHs that can be arranged in one downlink subframe is controlled to eight. When three EPHICH sets are configured, the number of EPHICHs that can be arranged in one downlink subframe Are controlled to twelve. The base station apparatus 3 controls the number of EPHICH sets configured for the terminal apparatus 5 and controls the number of EPHIICH used for the terminal apparatus 5. The EPHICH with the smallest identification number is associated in order from the EPHICH set with the smallest identification number assigned to the EPHICH set. For example, if two EPHICH sets (EPHICH set0, EPHICH set1) are configured, EPHICH0, EPHICH1, EPHICH2, EPHICH3 are configured in EPHICH set0, and EPHICH4, EPHICH5, EPHICH6, and EPHICH7 are included in EPHICH7. Is done.

  For example, a case where there is a possibility that three EPHICHs may be arranged in the EPHICH set in one downlink subframe is described. Each of the three EPHIICHs is indexed (EPHIICH0, EPHICH1, EPHICH2). For example, one EPHIICH is composed of four ECCEs. Each EPHIICH is implicitly associated with a different identifier (RNTI). For example, when three EPHIICHs (EPHICH0, EPHICH1, and EPHICH2) are configured in the EPHICH set, EPHICH0 corresponds to the identifier “FFF4” (identifier 0), and EPHICH1 corresponds to the identifier “FFF5” (identifier 1). EPHICH2 corresponds to the identifier “FFF6” (identifier 2). Here, a case where the identifier is composed of 16 bits will be described, and the identifier is represented by a hexadecimal number. The identifier corresponding to the EPHICH with the smallest index is determined in advance, and the EPHICH of the next index is sequentially associated with the identifier of the next value.

  For example, a case will be described in which two EPHICH sets (EPHICH set0, EPHIICH set1) are configured in one downlink subframe, and three EPHIICHs may be arranged in one EPHICH set. Each of the six EPHIICHs is indexed (EPHICH0, EPHIICH1, EPHIICH2, EPHIICH3, EPHIICH4, EPHIICH5). For example, one EPHIICH is composed of four ECCEs. Each EPHIICH is implicitly associated with a different identifier (RNTI). For example, EPHICH0 corresponds to the identifier “FFF4” (identifier 0), EPHIICH1 corresponds to the identifier “FFF5” (identifier 1), EPHIICH2 corresponds to the identifier “FFF6” (identifier 2), and EPHICH3 corresponds to the identifier “FFF7” ( Corresponding to identifier 3), EPHICH4 corresponds to identifier "FFF8" (identifier 4), and EPHICH5 corresponds to identifier "FFF9" (identifier 5). EPHICH0, EPHIICH1, and EPHIICH2 may be arranged in EPHIICH set0, and EPHIICH3, EPHIICH4, and EPHIICH5 may be arranged in EPHIICH set1.

  A common identifier may be used between EPHICHs configured in different EPHICH sets. For example, a case will be described in which two EPHICH sets (EPHICH set0, EPHICH set1) are configured in one downlink subframe, and four EPHIICHs may be arranged in one EPHICH set. Each of the six EPHIICHs is indexed (EPHICH0, EPHIICH1, EPHIICH2, EPHIICH3, EPHIICH4, EPHIICH5, EPHIICH6, EPHICH7). EPHICH0, EPHIICH1, EPHIICH2, and EPHIICH3 are configured as EPHIICH set0. EPHICH4, EPHICH5, EPHICH6, and EPHICH7 are configured in EPHIICH set1. EPHICH0 corresponds to the identifier “FFF4” (identifier 0), EPHIICH1 corresponds to the identifier “FFF5” (identifier 1), EPHIICH2 corresponds to the identifier “FFF6” (identifier 2), and EPHICH3 corresponds to the identifier “FFF7” (identifier 3). ), EPHIICH4 corresponds to the identifier “FFF4” (identifier 0), EPHIICH5 corresponds to the identifier “FFF5” (identifier 1), EPHIICH6 corresponds to the identifier “FFF6” (identifier 2), and EPHICH7 corresponds to the identifier Corresponds to “FFF7” (identifier 3).

  The EPHICH can be arranged in any one of the plurality of ECCEs of the predetermined ECCE index. Here, an area composed of a plurality of ECCEs in which the EPHICH can be arranged in the downlink subframe is referred to as an EPHIICH search space. For example, when the EPHIICH is configured in four DL PRB pairs as shown in FIG. 18, the EPHIICH search space is ECCE0, ECCE1, ECCE2, ECCE3, ECCE4, ECCE5, ECCE7, ECCE8, and ECCE9. It comprises ECCE10, ECCE11, ECCE12, ECCE13, ECCE14, and ECCE15. In other words, all ECCEs in the EPHICH set may be configured as an EPHIICH search space. For example, when the EPHIICH is configured in four DL PRB pairs as shown in FIG. 18, the EPHIICH search space is ECCE0, ECCE1, ECCE2, ECCE3, ECCE4, ECCE5, ECCE7, ECCE8, and ECCE9. It consists of ECCE10 and ECCE11. In other words, the restricted ECCE in the EPHICH set is configured as an EPHIICH search space.

  EPHICH set is composed of four DL PRB pairs, and EPHICH set is composed of ECCE0, ECCE1, ECCE2, ECCE3, ECCE4, ECCE5, ECCE6, ECCE7, ECCE8, ECCE9, ECCE10, and ECCE11. For example, EPHICH0 is arranged in ECCE0, ECCE1, ECCE2, and ECCE3, and EPHICH1 is arranged in ECCE4, ECCE5, ECCE6, and ECCE7. For example, EPHICH1 is arranged in ECCE0, ECCE1, ECCE2, and ECCE3, and EPHICH0 is arranged in ECCE4, ECCE5, ECCE6, and ECCE7. For example, EPHICH0 is arranged in ECCE0, ECCE1, ECCE2, and ECCE3, and EPHICH2 is arranged in ECCE4, ECCE5, ECCE6, and ECCE7. For example, EPHICH0 is arranged in ECCE0, ECCE1, ECCE2, and ECCE3, and EPHICH1 is arranged in ECCE8, ECCE9, ECCE10, and ECCE11. For example, EPHICH0 is arranged in ECCE0, ECCE1, ECCE2, and ECCE3, EPHICH1 is arranged in ECCE4, ECCE5, ECCE6, and ECCE7, and EPHICH2 is arranged in ECCE8, ECCE9, ECCE10, and ECCE11. For example, EPHICH2 is arranged in ECCE0, ECCE1, ECCE2, and ECCE3, EPHICH1 is arranged in ECCE4, ECCE5, ECCE6, and ECCE7, and EPHICH0 is arranged in ECCE8, ECCE9, ECCE10, and ECCE11.

  In the above description, a case has been described in which a plurality of EPHICH sets are configured for one EPDCCH set and the number of EPHICHs is controlled. However, the terminal device 5 includes a plurality of EPDCCH sets and a plurality of EPHICH sets. Each of the plurality of EPHICH sets may be associated with any EPDCCH set. EPHICH sets associated with different EPDCCH sets are used as independent EPHICH groups. Information indicating the association between the EPDCCH set and the EPHICH set is notified from the base station apparatus 3 to the terminal apparatus 5. The terminal device 5 recognizes that the EPHICH corresponding to the PUSCH to which resources are allocated using the EPDCCH received in a certain EPDCCH set is arranged in the EPHICH set associated with the EPDCCH set that has received the EPDCCH, and the EPHICH Receive EPHICH in set. The base station apparatus 3 transmits the EPHICH for the PUSCH to which resources are allocated using the EPDCCH transmitted in a certain EPDCCH set, in the EPHICH set associated with the EPDCCH set that transmitted the EPDCCH. In practice, the transmission points of the respective EPDCCH set signals are different, the transmission points of the respective EPHICH set signals are different, and the EPDCCH set and the EPHICH set of the same transmission point are associated with each other. Thereby, DPS is supported by EPDCCH and EPHIICH. For example, the terminal device 5 can dynamically receive an EPDCCH signal and an EPHICH signal from a transmission point with good channel conditions. For example, in consideration of load balance, the base station apparatus 3 selects a transmission point for transmitting a signal and transmits the signal, and the terminal apparatus 5 receives an EPDCCH signal and an EPHICH signal from a transmission point with a sufficient communication resource. It can be received dynamically.

  For example, two EPDCCH sets (EPDCCH set 1, EPDCCH set 2) and two EPHICH sets (EPHICH set 1, EPHICH set 2) are configured for the terminal device 5. EPDCCH set 1 is associated with EPHICH set 1. EPDCCH set 2 is associated with EPHICH set 2. The EPHICH corresponding to the PUSCH to which resources are allocated in the EPDCCH of the EPDCCH set 1 is arranged in the EPHICH set 1. The EPHICH for the PUSCH to which resources are allocated in the EPDCCH of the EPDCCH set 2 is arranged in the EPHICH set 2.

  For a plurality of EPHICH sets configured in the terminal device 5, the number of EPHICHs (number of ACK / NACK information) that can be arranged in the EPHICH set may be controlled for each EPHICH set. Thereby, the number of EPHICH required for each transmission point (number of ACK / NACK information) is appropriately controlled. For example, the number of EPHICHs configured in the EPHICH set is controlled in accordance with the number of terminal devices 5 configuring the PHICH set.

  For example, two EPDCCH sets (EPDCCH set 1, EPDCCH set 2) and three EPHICH sets (EPHICH set 1, EPHICH set 2, EPHICH set 3) are configured for the terminal device 5. In EPDCCH set 1, EPHICH set 1 and EPHICH set 2 are associated with each other. EPDCCH set 2 is associated with EPHICH set 3. The EPHICH corresponding to the PUSCH to which resources are allocated in the EPDCCH of the EPDCCH set 1 is arranged in the EPHICH set 1 or the EPHICH set 2. The EPHICH corresponding to the PUSCH to which resources are allocated in the EPDCCH of the EPDCCH set 2 is arranged in the EPHICH set 3.

  The number of EPHICH sets associated with one EPDCCH set may be controlled. Thereby, the number of EPHICH required for each transmission point (number of ACK / NACK information) is appropriately controlled. For example, according to the number of terminal devices 5 to which signals are transmitted from a certain transmission point, the number of EPHICH sets configured for that transmission point is controlled.

  The same parameter may be used for the second reference signal configured in each of the associated EPDCCH set and EPHICH set. Specifically, the same parameter is used for initialization of the pseudo-random sequence used for generating the second reference signal. Accordingly, when the EPDCCH set (EPDCCH set to which distributed mapping is applied) and the EPHICH set are configured from the same DL PRB pair, a second common to the EPDCCH and EPHICH arranged in the DL PRB pair is used. A reference signal can be used, and it is not necessary to configure the second reference signal using separate resources for EPDCCH and EPHIICH, and effective use of resources is achieved. Since the transmission points are the same, the second reference signal used for EPDCCH and the second reference signal used for EPHIICH can be shared for EPDCCH and EPHIICH with the same transmission point.

  The correspondence relationship with data transmitted on downlink ACK / NACK, EPHICH, and PUSCH will be described. In one downlink subframe, indexing is performed on the configured ACK / NACK. Indexing is performed on ACK / NACK configured for each EPHICH. In one downlink subframe, indexing is performed on EPHICH. Indexing is performed on an EPHIICH configured for each of one or more EPHICH sets. For example, the terminal device 5 is configured with three EPHICH sets (EPHICH set 0, EPHICH set 1, EPHICH set 2) and two EPDCCH sets (EPDCCH set 0, EPDCCH set 1), and EPHICH set 0 with respect to EPDCCH set 0. EPHICH set 1 and EPHICH set 1, EPHICH set 1 is associated with EPHICH set 2, and EPHICH set 0 and EPHICH set 1 are indexed when EPHICH set 1 is configured for each EPHICH set 1. (EPHIICH0, EPHIICH1, EPHIICH2, EPHIICH3, EPHIICH4, EPHIICH5, EPHIICH6, EPHICH7) At the same time, EPHICH is indexed through EPHICH set 2 (EPHICH0, EPHICH1, EPHIICH2, EPHICH3). For example, when two EPHICH sets (EPHICH set 0, EPHICH set 1) and one EPDCCH set (EPDCCH set 0) are configured in the terminal device 5, and four EPHICHs are configured for each EPHICH set, EPHICH set 0 And EPHIICH set 1 are used to index EPHIICH (EPHICH0, EPHIICH1, EPHIICH2, EPHIICH3, EPHIICH4, EPHIICH5, EPHICH6, EPHICH7).

  An EPHICH in which ACK / NACK for data transmitted on a PUSCH is arranged is arranged in the UL PRB pair index having the smallest index among one or more UL PRB pairs used in the PUSCH and in the UL PRB pair. Is associated with the cyclic shift (value) of the DM RS. An EPHIICH of a certain EPHICH set is associated with a PUSCH to which resources are allocated in the EPDCCH arranged in the EPDCCH set previously associated with the EPHICH set. For example, the terminal device 5 recognizes an EPHICH set in which an EPHICH in which a signal including ACK / NACK for the transport block received by the PUSCH is arranged is based on the EPHIICH index. For example, the base station apparatus 3 transmits ACK / NACK information to the terminal apparatus 5 using any one of a plurality of EPHICH indexes corresponding to the EPHICH set in which the EPHICH is arranged.

  Next, an ACK / NACK for data transmitted on the PUSCH is the most indexed index among one or more UL PRB pairs used for the PUSCH from among a plurality of ACK / NACKs that can be arranged in the associated EPHICH. Correspondence is based on an index of a small UL PRB pair and a cyclic shift (value) of a DM RS arranged in the UL PRB pair. Note that other parameters may be further considered in each association. For example, a parameter indicating an offset for EPHICH may be configured in the uplink grant.

  For each one or more EPHICH sets, indexing of the EPHIICH and association of the EPHIICH with the identifier are performed. For example, when two EPHIICH sets are configured, each EPHIICH set is associated with a different EPDCCH set, and three EPHICHs (EPHICH0, EPHICH1, and EPHICH2) are configured, respectively, in each EPHICH set, EPHICH0 is Corresponding to the identifier “FFF4”, EPHICH1 may correspond to the identifier “FFF5”, and EPHICH2 may correspond to the identifier “FFF6”. For example, when two EPHIICH sets are configured, each EPHIICH set is associated with the same EPDCCH set, and three EPHICH (EPHICH0, EPHICH1, EPHIICH2) (EPHICH3, EPHICH4, EPHICH5) are configured, respectively, EPHICH0 Corresponds to the identifier “FFF4”, EPHICH1 corresponds to the identifier “FFF5”, EPHIICH2 corresponds to the identifier “FFF6”, EPHIICH3 corresponds to the identifier “FFF7”, EPHICH4 corresponds to the identifier “FFF8”, and EPHICH5 May correspond to the identifier “FFF9”. For example, when two EPHIICH sets are configured, each EPHIICH set is associated with the same EPDCCH set, and three EPHICH (EPHICH0, EPHICH1, EPHIICH2) (EPHICH3, EPHICH4, EPHICH5) are configured, respectively, EPHICH0 Corresponds to the identifier “FFF4”, EPHIICH1 corresponds to the identifier “FFF5”, EPHIICH2 corresponds to the identifier “FFF6”, EPHIICH3 corresponds to the identifier “FFF4”, EPHICH4 corresponds to the identifier “FFF5”, and EPHICH5 May correspond to the identifier “FFF6”.

<Overall configuration of base station apparatus 3>
Hereinafter, the configuration of the base station apparatus 3 according to the present embodiment will be described with reference to FIGS. 1, 2, and 3. FIG. 1 is a schematic block diagram showing the configuration of the base station apparatus 3 according to the embodiment of the present invention. As shown in this figure, the base station apparatus 3 includes a reception processing unit (second reception processing unit) 101, a radio resource control unit (second radio resource control unit) 103, and a control unit (second control unit). 105 and a transmission processing unit (second transmission processing unit) 107.

  The reception processing unit 101 demodulates and decodes received signals of PUCCH and PUSCH received from the terminal device 5 by the reception antenna 109 using the DM RS according to the instruction of the control unit 105, and extracts control information and information data. To do. The reception processing unit 101 performs a process of extracting UCI from an uplink subframe, UL PRB, in which the own apparatus assigns PUCCH resources to the terminal apparatus 5. The reception processing unit 101 is instructed from the control unit 105 what processing is to be performed on which uplink subframe and which UL PRB. For example, the reception processing unit 101 multiplies and combines a code sequence in the time domain and a code sequence in the frequency domain for a PUCCH (PUCCH format 1a, PUCCH format 1b) signal for ACK / NACK. A detection process to be performed is instructed from the control unit 105. Reception processing section 101 is instructed by control section 105 to use a frequency-domain code sequence and / or a time-domain code series used for processing for detecting UCI from PUCCH. The reception processing unit 101 outputs the extracted UCI to the control unit 105 and outputs information data to the upper layer.

  Further, the reception processing unit 101 detects (receives) a preamble sequence from the received PRACH signal received from the terminal device 5 by the reception antenna 109 in accordance with an instruction from the control unit 105. The reception processing unit 101 also estimates arrival timing (reception timing) along with detection of the preamble sequence. The reception processing unit 101 performs processing for detecting a preamble sequence for an uplink subframe, UL PRB pair, to which the device itself has assigned PRACH resources. The reception processing unit 101 outputs information regarding the estimated arrival timing to the control unit 105.

  Further, the reception processing unit 101 measures the channel quality of one or more UL PRBs (UL PRB pairs) using the SRS received from the terminal device 5. Also, the reception processing unit 101 detects (calculates and measures) an uplink synchronization shift using the SRS received from the terminal device 5. The reception processing unit 101 is instructed from the control unit 105 as to which uplink subframe and which UL PRB (UL PRB pair) to perform. The reception processing unit 101 outputs information regarding the measured channel quality and the detected uplink synchronization shift to the control unit 105. Details of the reception processing unit 101 will be described later.

  The reception processing unit 101 also outputs a cyclic redundancy check (CRC) code obtained by demodulating the PUSCH signal to the control unit 105. The transmission processing unit 407 of the terminal device 3 generates a CRC code from the information data, and transmits the information data and the CRC code by PUSCH. The CRC code is used to determine whether the data included in the PUSCH is incorrect or not. For example, if the information generated from the data using a generator polynomial determined in advance in the base station apparatus 3 is the same as the CRC code generated in the terminal apparatus 5 and transmitted on the PUSCH, it is determined that the data is not incorrect. If the information generated from the data using the generator polynomial determined in advance in the base station apparatus 3 is different from the CRC code generated in the terminal apparatus 5 and transmitted on the PDSCH, it is determined that the data is incorrect. Is done.

  The radio resource control unit 103 assigns resources to EPDCCH, assigns resources to EPHICH, assigns resources to PUCCH, assigns resources to PDSCH, assigns resources to PUSCH, assigns resources to PRACH, assigns resources to SRS, DM RS cyclic shift (value) assignment, various channel modulation schemes, coding rates, transmission power control values, phase rotation amounts (weighting values) used for precoding processing, first reference signal and second reference signal The amount of phase rotation (weighting value) used for the precoding process is set. Here, the allocation of resources to EPHICH includes which index to allocate resources to EPHIICH. In other words, the radio resource control unit 103 allocates an identifier used for EPHICH to allocate resources. In other words, the radio resource control unit 103 determines an EPHICH set in which an EPHICH to which resources are allocated is arranged. The radio resource control unit 103 considers the PUSCH UL PRB pair assigned to the terminal device 5 and the cyclic shift (value) of the DM RS assigned to the terminal device 5 in consideration of the EPHICH assigned to the terminal device 5. Set.

  Radio resource control section 103 also sets a frequency domain code sequence, a time domain code sequence, and the like for PUCCH. Moreover, the radio | wireless resource control part 103 sets several EPDCCH set, and sets DL PRB pair used for each EPDCCH set. Also, the radio resource control unit 103 sets the ECCE resource mapping method and Search space for each EPDCCH set for each terminal device 5. Also, the radio resource control unit 103 sets a DL PRB pair in which EPHICH can be arranged (sets a plurality of EPHICH sets). Also, the radio resource control unit 103 may set the total number of EPHICH (downlink ACK / NACK) that can be arranged in the downlink subframe for each EPHICH set. Also, the radio resource control unit 103 sets the association between the EPDCCH set and one or more EPHICH sets. Part of the information set by the radio resource control unit 103 is notified to the terminal device 5 via the transmission processing unit 107, and for example, information indicating DL PRB pairs of one or more EPDCCH sets, resource mapping of the EPDCCH set Information indicating a method, information indicating a DL PRB pair in which EPHICH can be arranged (information indicating a DL RPB pair of one or more EPHICH sets), and information indicating an association between an EPDCCH set and an EPHICH set are notified to the terminal device 5 Is done. For example, information on the total number of EPHICH (downlink ACK / NACK) may be notified.

  Also, the radio resource control unit 103 sets PDSCH radio resource allocation and the like based on the UCI acquired by the reception processing unit 101 using the PUCCH and input via the control unit 105. For example, when ACK / NACK acquired using PUCCH is input, radio resource control section 103 assigns PDSCH resources for which NACK is indicated by ACK / NACK to terminal device 5.

  The radio resource control unit 103 outputs various control signals to the control unit 105. For example, the control signal is a control signal indicating an EPDCCH resource mapping method, a control signal indicating an EPDCCH resource allocation, a control signal indicating an EPHICH resource allocation, or the like.

  Based on the control signal input from the radio resource control unit 103, the control unit 105 allocates a DL PRB pair to the PDSCH, allocates resources to the EPDCCH, allocates resources to the EPHICH, sets a modulation scheme for the PDSCH, and sets the modulation scheme for the PDSCH and the EPDCCH. Setting of coding rate (ECDC aggregation number of EPDCCH), setting of antenna port for transmitting ECCE signal, setting of antenna port for transmitting EPHICH signal, PDSCH and EPDCCH and EPHICH, first reference signal and second Control such as setting of precoding processing for the reference signal is performed on the transmission processing unit 107. The control unit 105 determines one or more EPHICH sets to which the EPHICH resources are allocated from the EPDCCH set in which the EPDCCH used for transmission of the PUSCH resource allocation information is allocated, and the UL PRB pair and the DM RS allocated to the PUSCH. The index of the EPHICH allocated in one or more EPHICH sets is determined from the cyclic shift of. Here, judging the index of EPHIICH means judging the identifier used for EPHIICH. Here, judging the index of EPHIICH means judging the EPHIICH set in which EPHICH is arranged.

  In addition, the control unit 105 generates DCI transmitted using the EPDCCH based on the control signal input from the radio resource control unit 103 and outputs the DCI to the transmission processing unit 107. The DCI transmitted using the EPDCCH is a downlink assignment, an uplink grant, or the like. In addition, the control unit 105 transmits information indicating the EPDCCH set, information indicating the resource mapping method of the EPDCCH set, information indicating the EPHICH set, information indicating the association between the EPDCCH set and the EPHICH set, and the like. Through the control, the terminal device 5 is controlled to transmit using the PDSCH.

  Based on the control signal input from radio resource control section 103, control section 105 assigns UL PRB pair to PUSCH, assigns cyclic shift value of DM RS, assigns resources to PUCCH, and modifies the modulation scheme of PUSCH and PUCCH. The reception processing unit 101 performs control such as setting, PUSCH coding rate setting, PUCCH detection processing, PUCCH code sequence setting, PRACH resource allocation, and SRS resource allocation. In addition, the control unit 105 receives the UCI transmitted from the terminal device 5 using the PUCCH from the reception processing unit 101, and outputs the input UCI to the radio resource control unit 103.

  Further, the control unit 105 receives information indicating the arrival timing of the detected preamble sequence and information indicating the uplink synchronization shift detected from the received SRS from the reception processing unit 101, and transmits the uplink transmission timing. (TA: Timing Advance, Timing Adjustment, Timing Alignment) (TA value) is calculated. Information (TA command) indicating the calculated uplink transmission timing adjustment value is notified to the terminal device 5 via the transmission processing unit 107.

  The control unit 105 compares the information generated from the data input from the reception processing unit 101 using a predetermined generation polynomial with the CRC code input from the reception processing unit 101, and determines whether the data is incorrect. ACK / NACK is generated. The generated ACK / NACK is transmitted from the transmission processing unit 107 using the EPHICH designated by the radio resource control unit 103.

  Based on the control signal input from the control unit 105, the transmission processing unit 107 generates a signal to be transmitted using EPDCCH, EPHICH, and PDSCH, and transmits the signal through the transmission antenna 111. The transmission processing unit 107 receives the information indicating the EPDCCH set, the information indicating the EPDCCH set resource mapping method, the information indicating the EPHICH set, the information data input from the upper layer, and the like, input from the radio resource control unit 103. It transmits with respect to the terminal device 5 using PDSCH, and transmits DCI input from the control part 105 with respect to the terminal device 5 using EPDCCH. The transmission processing unit 107 transmits the first reference signal and the second reference signal. For the sake of simplification of explanation, hereinafter, the information data is assumed to include information on several types of control. Details of the transmission processing unit 107 will be described later.

<Configuration of transmission processing unit 107 of base station apparatus 3>
Hereinafter, details of the transmission processing unit 107 of the base station apparatus 3 will be described. FIG. 2 is a schematic block diagram showing the configuration of the transmission processing unit 107 of the base station apparatus 3 according to the embodiment of the present invention. As shown in this figure, the transmission processing unit 107 includes a plurality of shared channel processing units 201-1 to 201-M (hereinafter, the shared channel processing units 201-1 to 201-M are collectively referred to as a shared channel processing unit 201). ), A plurality of control channel processing units 203-1 to 203-M (hereinafter, the control channel processing units 203-1 to 203-M are collectively referred to as control channel processing unit 203), a downlink reference signal processing unit 205, Coding processing unit 231, multiplexing unit 207, IFFT (Inverse Fast Fourier Transform) unit 209, GI (Guard Interval) insertion unit 211, D / A (Digital / Analog converter) unit 213, a transmission RF (Radio Frequency) unit 215, and a transmission antenna 111. Since each shared channel processing unit 201 and each control channel processing unit 203 have the same configuration and function, only one of them will be described as a representative. For simplification of description, it is assumed that the transmission antenna 111 is a collection of a plurality of transmission antennas.

  As shown in this figure, the shared channel processing unit 201 includes a turbo coding unit 219, a data modulation unit 221 and a precoding processing unit 229, respectively. As shown in this figure, the control channel processing unit 203 includes a convolutional coding unit 223, a QPSK modulation unit 225, and a precoding processing unit 227. The shared channel processing unit 201 performs PDSCH processing. The control channel processing unit 203 performs EPDCCH and EPHIICH processing.

  The shared channel processing unit 201 performs baseband signal processing for transmitting information data to the terminal device 5 by the OFDM method. The turbo encoding unit 219 performs turbo encoding for increasing the error tolerance of the data at the encoding rate input from the control unit 105 and outputs the input information data to the data modulation unit 221. The data modulation unit 221 uses the modulation method input from the control unit 105, for example, QPSK (Quadrature Phase Shift Keying), 16QAM (16-value quadrature amplitude modulation), to the data encoded by the turbo coding unit 219. Modulation with a modulation scheme such as 16 Quadrature Amplitude Modulation) or 64QAM (64 Quadrature Amplitude Modulation) to generate a signal sequence of modulation symbols. The data modulation unit 221 outputs the generated signal sequence to the precoding processing unit 229. The precoding processing unit 229 performs precoding processing on the signal input from the data modulation unit 221 and outputs the result to the multiplexing unit 207.

  The control channel processing unit 203 performs baseband signal processing for transmitting the control information (DCI, ACK / NACK) input from the control unit 105 using the OFDM scheme. The convolutional coding unit 223 performs convolutional coding for increasing the error tolerance of the control information based on the coding rate input from the control unit 105. Here, the control information is controlled in bit units. Note that the coding rate of DCI transmitted on the EPDCCH is related to the set ECCE aggregation number. The convolutional coding unit 223 also performs rate matching to adjust the number of output bits for the bits subjected to the convolutional coding processing based on the coding rate input from the control unit 105. The convolutional coding unit 223 outputs the encoded control information to the QPSK modulation unit 225. The QPSK modulation unit 225 modulates the control information encoded by the convolutional coding unit 223 using the QPSK modulation method, and outputs the modulated modulation symbol signal sequence to the precoding processing unit 227. Precoding processing section 227 performs precoding processing on the signal input from QPSK modulation section 225 and outputs the result to multiplexing section 207. Note that the precoding processing unit 227 can output the signal input from the QPSK modulation unit 225 to the multiplexing unit 207 without performing precoding processing.

  The downlink reference signal processing unit 205 generates a downlink reference signal (first reference signal, second reference signal) that is a known signal in the terminal device 5 and outputs the downlink reference signal to the precoding processing unit 231. The precoding processing unit 231 performs precoding processing on the first reference signal and the second reference signal input from the downlink reference signal processing unit 205 and outputs them to the multiplexing unit 207. The precoding processing unit 231 performs the same processing as the processing performed on the PDSCH in the precoding processing unit 229 on the first reference signal, and the same processing as the processing performed on the EPDCCH or EPHICH in the precoding processing unit 227. Processing is performed on the second reference signal.

  The multiplexing unit 207 receives the signal input from the downlink reference signal processing unit 205, the signal input from each shared channel processing unit 201, and the signal input from each control channel processing unit 203 from the control unit 105. Are multiplexed in the downlink subframe. A control signal related to DL PRB pair allocation to the PDSCH set by the radio resource control unit 103, resource allocation to EPHICH, resource allocation to EPDCCH, and EPDCCH resource mapping method is input to the control unit 105. Based on this, the control unit 105 controls the processing of the multiplexing unit 207. For example, the multiplexing unit 207 multiplexes each EPHIICH to different ECCE resources. The multiplexing unit 207 outputs the multiplexed signal to the IFFT unit 209.

  IFFT section 209 performs fast inverse Fourier transform on the signal multiplexed by multiplexing section 207, performs OFDM modulation, and outputs the result to GI insertion section 211. The GI insertion unit 211 generates a baseband digital signal including symbols in the OFDM scheme by adding a guard interval to the signal modulated by the OFDM scheme by the IFFT unit 209. As is well known, the guard interval is generated by duplicating a part of the head or tail of the OFDM symbol to be transmitted. The GI insertion unit 211 outputs the generated baseband digital signal to the D / A unit 213. The D / A unit 213 converts the baseband digital signal input from the GI insertion unit 211 into an analog signal and outputs the analog signal to the transmission RF unit 215. The transmission RF unit 215 generates an in-phase component and a quadrature component of the intermediate frequency from the analog signal input from the D / A unit 213, and removes an extra frequency component for the intermediate frequency band. Next, the transmission RF unit 215 converts (up-converts) the intermediate frequency signal into a high frequency signal, removes excess frequency components, amplifies the power, and transmits the signal to the terminal device 5 via the transmission antenna 111. To do.

<Configuration of Reception Processing Unit 101 of Base Station Device 3>
Hereinafter, details of the reception processing unit 101 of the base station apparatus 3 will be described. FIG. 3 is a schematic block diagram showing the configuration of the reception processing unit 101 of the base station apparatus 3 according to the embodiment of the present invention. As shown in this figure, the reception processing unit 101 includes a reception RF unit 301, an A / D (Analog / Digital converter) unit 303, a symbol timing detection unit 309, a GI removal unit 311, an FFT unit 313, a sub Carrier demapping section 315, propagation path estimation section 317, PUSCH propagation path equalization section 319, PUCCH propagation path equalization section 321, IDFT section 323, data demodulation section 325, turbo decoding section 327, physical uplink control A channel detection unit 329, a preamble detection unit 331, and an SRS processing unit 333 are included.

  The reception RF unit 301 appropriately amplifies the signal received by the reception antenna 109, converts it to an intermediate frequency (down-conversion), removes unnecessary frequency components, and amplifies the signal level so that the signal level is appropriately maintained. The level is controlled, and quadrature demodulation is performed based on the in-phase component and the quadrature component of the received signal. The reception RF unit 301 outputs the quadrature demodulated analog signal to the A / D unit 303. A / D section 303 converts the analog signal quadrature demodulated by reception RF section 301 into a digital signal, and outputs the converted digital signal to symbol timing detection section 309 and GI removal section 311.

  The symbol timing detection unit 309 detects the symbol timing based on the signal input from the A / D unit 303, and outputs a control signal indicating the detected symbol boundary timing to the GI removal unit 311. The GI removal unit 311 removes a portion corresponding to the guard interval from the signal input from the A / D unit 303 based on the control signal from the symbol timing detection unit 309, and converts the remaining portion of the signal to the FFT unit 313. Output to. The FFT unit 313 performs fast Fourier transform on the signal input from the GI removal unit 311, performs demodulation of the DFT-Spread-OFDM scheme, and outputs the result to the subcarrier demapping unit 315. Note that the number of points in the FFT unit 313 is equal to the number of points in the IFFT unit of the terminal device 5 described later.

  The subcarrier demapping unit 315 separates the signal demodulated by the FFT unit 313 into DM RS, SRS, PUSCH signal, and PUCCH signal based on the control signal input from the control unit 105. The subcarrier demapping unit 315 outputs the separated DM RS to the propagation path estimation unit 317, outputs the separated SRS to the SRS processing unit 333, and sends the separated PUSCH signal to the PUSCH propagation path equalization unit 319. And outputs the separated PUCCH signal to the PUCCH channel equalization unit 321.

  The propagation path estimation unit 317 estimates propagation path fluctuations using the DM RS separated by the subcarrier demapping unit 315 and a known signal. The propagation path estimation unit 317 outputs the estimated propagation path estimation value to the PUSCH propagation path equalization unit 319 and the PUCCH propagation path equalization unit 321. The PUSCH channel equalization unit 319 equalizes the amplitude and phase of the PUSCH signal separated by the subcarrier demapping unit 315 based on the channel estimation value input from the channel estimation unit 317. Here, equalization refers to a process for restoring the fluctuation of the propagation path received by the signal during wireless communication. PUSCH propagation path equalization section 319 outputs the adjusted signal to IDFT section 323.

  The IDFT unit 323 performs discrete inverse Fourier transform on the signal input from the PUSCH channel equalization unit 319 and outputs the result to the data demodulation unit 325. The data demodulating unit 325 demodulates the PUSCH signal converted by the IDFT unit 323, and outputs the demodulated PUSCH signal to the turbo decoding unit 327. This demodulation is demodulation corresponding to the modulation method used in the data modulation unit of the terminal device 5, and the modulation method is input from the control unit 105. The turbo decoding unit 327 decodes information data from the PUSCH signal input from the data demodulation unit 325 and demodulated. The coding rate is input from the control unit 105.

  The PUCCH channel equalization unit 321 equalizes the amplitude and phase of the PUCCH signal separated by the subcarrier demapping unit 315 based on the channel estimation value input from the channel estimation unit 317. The PUCCH channel equalization unit 321 outputs the equalized signal to the physical uplink control channel detection unit 329.

  The physical uplink control channel detection unit 329 demodulates and decodes the signal input from the PUCCH channel equalization unit 321 and detects UCI. The physical uplink control channel detection unit 329 performs processing for separating a signal code-multiplexed in the frequency domain and / or the time domain. The physical uplink control channel detection unit 329 detects ACK / NACK, SR, CQI from the PUCCH signal code-multiplexed in the frequency domain and / or time domain using the code sequence used on the transmission side. Process. Specifically, the physical uplink control channel detection unit 329 performs a detection process using a code sequence in the frequency domain, that is, a process for separating a code-multiplexed signal in the frequency domain, for each PUCCH subcarrier signal. On the other hand, after multiplying each code of the code sequence, a signal multiplied by each code is synthesized. Specifically, the physical uplink control channel detection unit 329 performs detection processing using a code sequence in the time domain, that is, processing for separating code-multiplexed signals in the time domain, for each SC-FDMA symbol of PUCCH. Is multiplied by each code of the code sequence, and then the signal multiplied by each code is synthesized. The physical uplink control channel detection unit 329 sets detection processing for the PUCCH signal based on the control signal from the control unit 105.

  The SRS processing unit 333 measures the channel quality using the SRS input from the subcarrier demapping unit 315, and outputs the UL PRB (UL PRB pair) channel quality measurement result to the control unit 105. The SRS processing unit 333 is instructed by the control unit 105 as to which uplink subframe and which UL PRB (UL PRB pair) signal the channel quality of the terminal apparatus 5 is to be measured. Further, the SRS processing unit 333 detects an uplink synchronization shift using the SRS input from the subcarrier demapping unit 315, and sends information (synchronization shift information) indicating the uplink synchronization shift to the control unit 105. Output. Note that the SRS processing unit 333 may perform processing for detecting an uplink synchronization shift from a time domain received signal. The specific process may be the same as the process performed by the preamble detection unit 331 described later.

  Based on the signal input from the A / D unit 303, the preamble detection unit 331 performs a process of detecting (receiving) the preamble transmitted for the received signal corresponding to the PRACH. Specifically, the preamble detection unit 331 performs correlation processing on received signals at various timings within the guard time with replica signals generated using each preamble sequence that may be transmitted. . For example, when the correlation value is higher than a preset threshold value, the preamble detection unit 331 transmits from the terminal device 5 the same signal as the preamble sequence used to generate the replica signal used for the correlation processing. Judge that it was done. The preamble detection unit 331 determines that the timing with the highest correlation value is the arrival timing of the preamble sequence. The preamble detection unit 331 generates preamble detection information including at least information indicating the detected preamble sequence and information indicating arrival timing, and outputs the preamble detection information to the control unit 105.

  The control unit 105 includes a subcarrier demapping unit 315 based on control information (DCI) transmitted from the base station device 3 to the terminal device 5 using the EPDCCH and control information (RRC signaling) transmitted using the PDSCH. The data demodulation unit 325, the turbo decoding unit 327, the propagation path estimation unit 317, and the physical uplink control channel detection unit 329 are controlled. In addition, the control unit 105 determines which resource (uplink) the PRACH, PUSCH, PUCCH, and SRS that each terminal device 5 has transmitted (may have transmitted) based on the control information that the base station device 3 has transmitted to the terminal device 5. It is grasped whether it is comprised by the link sub-frame, UL PRB (UL PRB pair), the frequency domain code sequence, and the time domain code sequence.

<Overall configuration of terminal device 5>
Hereinafter, the configuration of the terminal device 5 according to the present embodiment will be described with reference to FIGS. 4, 5, and 6. FIG. 4 is a schematic block diagram showing the configuration of the terminal device 5 according to the embodiment of the present invention. As shown in this figure, the terminal device 5 includes a reception processing unit (first reception processing unit) 401, a radio resource control unit (first radio resource control unit) 403, and a control unit (first control unit) 405. The transmission processing unit (first transmission processing unit) 407 is configured.

  The reception processing unit 401 receives a signal from the base station apparatus 3, demodulates and decodes the received signal according to an instruction from the control unit 405. The reception processing unit 401 receives the EPHICH signal, demodulates the EPHICH signal using the second reference signal, decodes the demodulated signal, and receives the ACK / NACK information obtained by decoding. The data is output to the control unit 405. Further, the reception processing unit 401 outputs the CRC code included in the EPHIICH to the control unit 405. For example, the reception processing unit 401 performs processing for detecting an EPHICH including an ACK / NACK corresponding to the EPHICH set instructed from the control unit 405 among one or more EPHICH sets set by the base station device 3. When the reception processing unit 401 detects an EPDCCH signal addressed to itself, the reception processing unit 401 outputs the DCI obtained by decoding the EPDCCH signal to the control unit 405. For example, the reception processing unit 401 performs a process of detecting an EPDCCH addressed to itself in a Search Space in the EPDCCH set designated by the base station device 3. For example, the reception processing unit 401 estimates the propagation path using the second reference signal in the EPDCCH set designated by the base station device 3, demodulates the EPDCCH signal, and receives control information addressed to the own device. A process for detecting a signal including the signal is performed. For example, the reception processing unit 401 demodulates the EPDCCH signal using the second reference signal of the antenna port corresponding to the ECCE or EREG that constitutes the EPDCCH candidate that performs the detection process.

  Further, the reception processing unit 401 receives, via the control unit 405, information data obtained by decoding the PDSCH addressed to the own device based on an instruction from the control unit 405 after the DCI included in the EPDCCH is output to the control unit 405. To the upper layer. In the DCI included in the EPDCCH, the downlink assignment includes information indicating the allocation of PDSCH resources. Also, the reception processing unit 401 outputs the control information generated by the radio resource control unit 103 of the base station apparatus 3 obtained by decoding the PDSCH to the control unit 405, and the radio of the own apparatus via the control unit 405. Output to the resource control unit 403. For example, the control information generated by the radio resource control unit 103 of the base station apparatus 3 includes information indicating a DL PRB pair of the EPDCCH set, information indicating a resource mapping method of the EPDCCH set, and a DL PRB pair in which the EPHICH can be arranged. Information indicating the correspondence between the EPDCCH set and the EPHICH set.

  Also, the reception processing unit 401 outputs the CRC code included in the PDSCH to the control unit 405. Although omitted in the description of the base station apparatus 3, the transmission processing unit 107 of the base station apparatus 3 generates a CRC code from the information data, and transmits the information data and the CRC code by PDSCH. The CRC code is used to determine whether the data included in the PDSCH is incorrect or not. For example, if the information generated from the data using a predetermined generator polynomial in the terminal device 5 is the same as the CRC code generated in the base station device 3 and transmitted on the PDSCH, it is determined that the data is not incorrect. If the information generated from the data using the generator polynomial determined in advance in the terminal device 5 is different from the CRC code generated in the base station device 3 and transmitted on the PDSCH, it is determined that the data is incorrect. Is done.

  The control unit 405 confirms the data transmitted from the base station device 3 using the PDSCH and input from the reception processing unit 401, outputs the information data to the upper layer in the data, and the base station device in the data The reception processing unit 401 and the transmission processing unit 407 are controlled based on the control information generated by the third radio resource control unit 103. Further, the control unit 405 controls the reception processing unit 401 and the transmission processing unit 407 based on an instruction from the radio resource control unit 403. For example, the control unit 405 controls the reception processing unit 401 to perform a process of detecting the EPDCCH for the signal in the DL PRB pair of the EPDCCH set instructed from the radio resource control unit 403. For example, the control unit 405 controls the reception processing unit 401 to perform demapping of the ECCE resource of the EPDCCH set based on the information indicating the EPDCCH set resource mapping method instructed from the radio resource control unit 403. For example, the control unit 405 detects EPHICH for a signal in the DL PRB pair where the EPHICH instructed from the radio resource control unit 403 can be arranged, and performs a process of demodulating and decoding the signal arranged in the EPHICH The reception processing unit 401 is controlled. For example, based on the information indicating the total number of EPHICHs instructed from the radio resource control unit 403, the control unit 405 receives the received PUSCH so as to detect the EPHICH corresponding to the transmitted PUSCH and extract the ACK / NACK information. The processing unit 401 may be controlled. For example, the control unit 405 is associated with the received EPDCCH set based on the information indicating the association between the EPDCCH set and the EPHICH set instructed from the radio resource control unit 403. The reception processing unit 401 is controlled to detect EPHIICH in two or more EPHICH sets.

  In addition, the control unit 405 controls the reception processing unit 401 in a region where processing for detecting EPDCCH in the EPDCCH set is executed. Specifically, the control unit 405 sets, for each ECCE aggregation number, an ECCE aggregation number that sets a search space for each EPDCCH set, and an EPDCCH candidate that executes a process for detecting the EPDCCH in the EPDCCH set, for each ECCE aggregation number. Instruct (set) the reception processing unit 401. In addition, the control unit 405 controls the reception processing unit 401 to use the second reference signal of the antenna port corresponding to demodulation of EPDCCH and EPHIICH signals.

  The control unit 405 is based on the information indicating the DL PRB pair in which the EPHICH can be arranged, the number of EPHICH sets, the information indicating the UL PRB pair used for the PUSCH, and the information indicating the cyclic shift value of the DM RS. Determines the EPHICH that includes the ACK / NACK information corresponding to the transport block of the PUSCH transmitted by, and controls the reception processing unit 401. Alternatively, the control unit 405 includes information indicating the EPHICH set, information indicating the total number of EPHICH (downlink ACK / NACK), information indicating the UL PRB pair used for PUSCH, and information indicating the cyclic shift value of the DM RS. Based on this, EPHICH including ACK / NACK information corresponding to the transport block of PUSCH transmitted by the transmission processing unit 407 may be determined, and the reception processing unit 401 may be controlled. The control unit 405 is instructed by the radio resource control unit 403 to associate the EPDCCH set and the EPHICH set, and corresponds to the transport block of the PUSCH transmitted by the transmission processing unit 407 to any EPHICH in the EPHICH set. Whether the ACK / NACK information to be included is included is determined as described above. As described above, the control unit 405 corresponds to the UL PRB pair used for the PUSCH, the cyclic shift value of the DM RS, the EPHICH (EPHICH index), and the ACK / NACK (ACK / NACK index) in the EPHICH. Attaching rules are recognized in advance.

  Further, the control unit 405 controls the reception processing unit 401 and the transmission processing unit 407 based on the DCI transmitted from the base station apparatus 3 using the EPDCCH and input from the reception processing unit 401. Specifically, the control unit 405 controls the reception processing unit 401 mainly based on the detected downlink assignment, and controls the transmission processing unit 407 mainly based on the detected uplink grant. Further, the control unit 405 controls the transmission processing unit 407 based on control information indicating a PUCCH transmission power control command included in the downlink assignment. The control unit 405 compares the information generated from the data input from the reception processing unit 401 using a predetermined generator polynomial with the CRC code input from the reception processing unit 401, and determines whether the data is incorrect. ACK / NACK is generated. The generated ACK / NACK is transmitted from the transmission processing unit 407. Further, the control unit 405 generates SR and CQI based on an instruction from the radio resource control unit 403. Further, the control unit 405 controls the transmission timing of the signal of the transmission processing unit 407 based on the adjustment value of the uplink transmission timing notified from the base station apparatus 3.

  The control unit 405 checks the data arranged in the EPHIICH decoded by the reception processing unit 401 and the CRC code (the CRC code subjected to the scrambling process using the identifier), and determines whether there is an error in the data. At the same time, the transmission processing unit 407 determines whether or not the EPHICH includes ACK / NACK information corresponding to the transport block of the PUSCH transmitted. In EPHICH, a dedicated identifier (RNTI) is used, and an exclusive OR process using the identifier dedicated to EPHICH is performed on a CRC code generated from a plurality of ACK / NACKs. Information that has undergone exclusive OR processing is encoded and modulated together with a plurality of ACK / NACK information, and the modulated signal is placed in EPHICH. Different identifiers may be used for different EPHICHes. At least different identifiers are used for different EPHICHs configured in the same EPHICH set. The control unit 405 generates a CRC code from the data (a plurality of ACK / NACK) arranged in the EPHICH decoded by the reception processing unit 401, and generates an ACK / ACK corresponding to the PUSCH transport block for the generated CRC code. An exclusive OR process using an identifier corresponding to EPHICH including NACK information, and a CRC code input from the reception processing unit 401 (a CRC code subjected to an exclusive OR process with an identifier on the transmission side) If they are the same, it is determined that ACK / NACK information corresponding to the transport block of the PUSCH transmitted in the data obtained by decoding the signal arranged in EPHICH is included, and they are the same Otherwise, the transmission of the PUSCH transmitted to the data obtained by decoding the signal arranged in EPHIICH ACK / NACK information corresponding to the heat block is not contained, or it is determined that there is an error in the data obtained by decoding the arranged signal to EPHICH.

  If the control unit 405 determines that the data obtained by decoding the signal arranged in the EPHICH includes ACK / NACK information corresponding to the transport block of the PUSCH, based on the corresponding ACK / NACK information, Controls retransmission of PUSCH. When the control unit 405 does not determine that the data obtained by decoding the signal arranged in the EPHICH includes ACK / NACK information corresponding to the transport block of the PUSCH, the control unit 405 does not control the retransmission of the PUSCH.

  For example, a case will be described in which one EPDCCH set and two EPHICH sets (EPHICH set 0, EPHICH set 1) are configured in the terminal device 5 and four EPHICHs can be configured in each EPHICH set. EPHICH0, EPHICH1, EPHICH2, and EPHICH3 can be configured in EPHICH set0. EPHICH4, EPHICH5, EPHICH6, and EPHICH7 can be configured in EPHICH set1. Based on the UL PRB pair index used for the PUSCH and the cyclic shift value of the DM RS, the control unit 405 has an EPHICH including ACK / NACK information corresponding to the transport block of the PUSCH transmitted by the transmission processing unit 407. If it is determined that it is EPHICH3, the reception processing unit 401 is instructed to perform processing for detecting EPHIICH in EPHICH set 0 in which EPHICH3 can be arranged. The control unit 405 uses the identifier corresponding to EPHICH3 for the CRC code and the plurality of ACK / NACK data obtained by decoding the signal arranged in the EPHICH input from the reception processing unit 401. The CRC code is checked to confirm whether the detected EPHIICH is EPHICH3. Based on the UL PRB pair index used for the PUSCH and the cyclic shift value of the DM RS, the control unit 405 has an EPHICH including ACK / NACK information corresponding to the transport block of the PUSCH transmitted by the transmission processing unit 407. If it is determined that it is EPHICH5, the reception processing unit 401 is instructed to perform processing for detecting EPHIICH in EPHICH set 1 in which EPHICH5 can be arranged.

  The radio resource control unit 403 stores and holds the control information generated by the radio resource control unit 103 of the base station device 3 and notified from the base station device 3, and receives the reception processing unit 401 via the control unit 405. The transmission processing unit 407 is controlled. That is, the radio resource control unit 403 has a memory function for holding various parameters. For example, the radio resource control unit 403 indicates information on the DL PRB pair of the EPDCCH set, information on the resource mapping method of the EPDCCH set, information on the DL PRB pair in which the EPHICH can be arranged, and correspondence between the EPDCCH set and the EPHICH set Information is held and various control signals are output to the control unit 405. The radio resource control unit 403 determines an association between the EPDCCH set and the EPHICH set based on the RRC signaling received from the base station device 3. The radio resource control unit 403 determines the number of EPHICH sets associated with one EPDCCH set based on the RRC signaling received from the base station apparatus 3. The radio resource control unit 403 holds parameters related to PUSCH, PUCCH, SRS, and PRACH transmission power, and outputs a control signal to the control unit 405 so as to use the parameters notified from the base station apparatus 3.

  For example, the control unit 405 determines the number of EPHICHs that can be configured in the EPHICH set based on the information related to the DL PRB pair that can be placed with the EPHICH, input from the radio resource control unit 403. For example, the control unit 405 determines the total number of EPHICHs corresponding to one EPDCCH set based on information indicating the association between the EPHICH set and the EPDCCH set input from the radio resource control unit 403, and each EPHICH Determine the EPHICH set that can be placed. Then, the control unit 405 determines an EPHICH set in which the EPHICH corresponding to the PUSCH transmitted based on the UL grant is arranged based on the EPDCCH set in which the UL grant is detected. Then, the control unit 405 determines an EPHICH index corresponding to the transmitted PUSCH based on the UL PRB pair index used for the PUSCH and the cyclic shift value of the DM RS, and the EPHICH in which the EPHICH is arranged Determine set.

  Radio resource control section 403 sets values of parameters related to transmission power such as PUCCH, PUSCH, SRS, PRACH and the like. The transmission power value set in the radio resource control unit 403 is output to the transmission processing unit 407 by the control unit 405. Note that the DM RS configured with resources in the same UL PRB as the PUCCH is subjected to the same transmission power control as the PUCCH. Note that the DM RS configured with the same UL PRB resource as the PUSCH is subjected to the same transmission power control as the PUSCH. The radio resource control unit 403, for the PUSCH, parameters based on the number of UL PRB pairs assigned to the PUSCH, cell-specific and terminal-device-specific parameters previously notified from the base station apparatus 3, and a modulation scheme used for the PUSCH Are set, such as a parameter based on the estimated path loss value, a parameter based on the transmission power control command notified from the base station apparatus 3, and the like. The radio resource control unit 403, for the PUCCH, parameters based on the signal configuration of the PUCCH, cell-specific and terminal-specific parameters previously notified from the base station apparatus 3, parameters based on the estimated path loss value, notification A value such as a parameter based on the transmitted power control command is set.

  Note that, as parameters related to transmission power, parameters specific to cells and terminal devices are notified from the base station apparatus 3 using PDSCH, and transmission power control commands are notified from the base station apparatus 3 using EPDCCH. The transmission power control command for PUSCH is included in the uplink grant, and the transmission power control command for PUCCH is included in the downlink assignment. Various parameters related to transmission power notified from the base station apparatus 3 are appropriately stored in the radio resource control unit 403, and the stored values are input to the control unit 405.

  The transmission processing unit 407 transmits information data (transport block) and a signal obtained by encoding and modulating UCI to the base station apparatus 3 via the transmission antenna 411 using PUSCH and PUCCH resources according to instructions from the control unit 405. Send. Also, the transmission processing unit 407 sets the transmission power of PUSCH, PUCCH, SRS, DM RS, and PRACH according to the instruction of the control unit 405. Details of the transmission processing unit 407 will be described later.

<Reception Processing Unit 401 of Terminal Device 5>
Hereinafter, details of the reception processing unit 401 of the terminal device 5 will be described. FIG. 5 is a schematic block diagram illustrating a configuration of the reception processing unit 401 of the terminal device 5 according to the embodiment of the present invention. As shown in this figure, the reception processing unit 401 includes a reception RF unit 501, an A / D unit 503, a symbol timing detection unit 505, a GI removal unit 507, an FFT unit 509, a demultiplexing unit 511, a propagation path estimation unit 513, A first propagation path compensation unit 515, a shared channel decoding unit 517, a second propagation path compensation unit 519, a control channel decoding unit 521, and a demapping unit 533 are configured. As shown in this figure, the shared channel decoding unit 517 includes a data demodulation unit 523 and a turbo decoding unit 525. As shown in this figure, the control channel decoding unit 521 includes a QPSK demodulation unit 527 and a Viterbi decoder unit 529.

  The reception RF unit 501 appropriately amplifies the signal received by the reception antenna 409, converts it to an intermediate frequency (down-conversion), removes unnecessary frequency components, and amplifies the signal level so that the signal level is appropriately maintained. , And quadrature demodulation based on the in-phase and quadrature components of the received signal. The reception RF unit 501 outputs the quadrature demodulated analog signal to the A / D unit 503.

  A / D section 503 converts the analog signal quadrature demodulated by reception RF section 501 into a digital signal, and outputs the converted digital signal to symbol timing detection section 505 and GI removal section 507. Symbol timing detection section 505 detects symbol timing based on the digital signal converted by A / D section 503, and outputs a control signal indicating the detected symbol boundary timing to GI removal section 507. GI removal section 507 removes a portion corresponding to the guard interval from the digital signal output from A / D section 503 based on the control signal from symbol timing detection section 505, and converts the remaining portion of the signal to FFT section 509. Output to. The FFT unit 509 performs fast Fourier transform on the signal input from the GI removing unit 507, performs OFDM demodulation, and outputs the result to the demultiplexing unit 511.

  The demultiplexing unit 511 demultiplexes the signal demodulated by the FFT unit 509 into an EPDCCH signal, an EPHICH signal, and a PDSCH signal based on the control signal input from the control unit 405. The demultiplexing unit 511 outputs the separated PDSCH signal to the first propagation path compensation unit 515, and outputs the separated EPDCCH signal and the separated EPHICH signal to the second propagation path compensation unit 519. . For example, the demultiplexing unit 511 outputs the EPDCCH signal of the EPDCCH set designated to the own device to the second propagation path compensation unit 519. For example, the demultiplexing unit 511 outputs to the second propagation path compensation unit 519 an EPHICH set signal in which EPHICH including downlink ACK / NACK information for the transport block transmitted by PUSCH is arranged. In addition, the demultiplexing unit 511 separates the downlink resource element in which the first reference signal and the second reference signal are arranged, and the first reference signal and the second reference signal are propagated to the propagation path estimation unit 513. Output to. For example, the demultiplexing unit 511 outputs the second reference signal of the EPDCCH set designated to the own device to the propagation path estimation unit 513. For example, the demultiplexing unit 511 outputs the second reference signal in the same DL PRB pair as the EPHICH to the propagation path estimation unit 513.

  The propagation path estimation unit 513 estimates propagation path fluctuations using the reference signals (first reference signal and second reference signal) separated by the demultiplexing part 511 and known signals, and detects propagation path fluctuations. In order to compensate, a propagation path compensation value for adjusting the amplitude and phase is set to a first propagation path compensation unit 515 (a propagation path compensation value based on the first reference signal is input) and a second propagation wave. This is output to a path compensation unit 519 (a propagation path compensation value based on the second reference signal is input). The propagation path estimation unit 513 uses the second reference signal for each of the one or more antenna ports specified by the control unit 405 to perform propagation path estimation and propagation path compensation values between the EPDCCH signal and the EPHICH signal. Is generated.

  First propagation path compensation section 515 adjusts the amplitude and phase of the PDSCH signal separated by demultiplexing section 511 according to the propagation path compensation value input from propagation path estimation section 513. The first propagation path compensation unit 515 adjusts a certain PDSCH signal according to the propagation path compensation value generated by the propagation path estimation unit 513 based on the first reference signal. First propagation path compensation section 515 outputs the signal whose propagation path has been adjusted to data demodulation section 523 of shared channel decoding section 517.

  Based on an instruction from the control unit 405, the shared channel decoding unit 517 demodulates and decodes the PDSCH and detects information data. Data demodulation section 523 demodulates the PDSCH signal input from propagation path compensation section 515, and outputs the demodulated PDSCH signal to turbo decoding section 525. This demodulation is demodulation corresponding to the modulation method used in the data modulation unit 221 of the base station device 3. The turbo decoding unit 525 decodes information data from the demodulated PDSCH signal input from the data demodulation unit 523 and outputs the decoded information data to the upper layer via the control unit 405. Note that the control information generated by the radio resource control unit 103 of the base station apparatus 3 transmitted using the PDSCH is also output to the control unit 405, and is also output to the radio resource control unit 403 via the control unit 405. The Note that the CRC code included in the PDSCH is also output to the control unit 405.

  Second propagation path compensation section 519 adjusts the amplitude and phase of the EPDCCH signal and EPHICH signal separated by demultiplexing section 511 according to the propagation path compensation value input from propagation path estimation section 513. The second propagation path compensation unit 519 adjusts the EPDCCH signal and the EPHICH signal according to the propagation path compensation value generated by the propagation path estimation unit 513 based on the second reference signal. The second propagation path compensation unit 519 adjusts the ECCE or EREG signal according to the propagation path compensation value generated based on the ECCE or the second reference signal of the antenna port corresponding to the EREG. Second propagation path compensation section 519 outputs the adjusted signal to demapping section 533.

  The demapping unit 533 performs EPDCCH demapping for the EPDCCH signal and EPHICH demapping for the EPHICH signal with respect to the signal input from the second propagation path compensation unit 519. . Further, the demapping unit 533 performs demapping with respect to localized mapping or demapping with respect to distributed mapping with respect to the EPDCCH signal input from the second propagation path compensation unit 519. The demapping unit 533 converts the input EPDCCH signal and EPHICH signal into ECCE units so that the control channel decoding unit 521 performs processing on the input EPDCCH signal and EPHICH signal in ECCE units. Convert to a signal. Demapping section 533 outputs the converted signal to QPSK demodulation section 527 of control channel decoding section 521.

  The control channel decoding unit 521 demodulates and decodes the signal input from the second propagation path compensation unit 519 as described below, and detects control data. The QPSK demodulation unit 527 performs QPSK demodulation on the EPDCCH signal and the EPHICH signal, and outputs the result to the Viterbi decoder unit 529. The Viterbi decoder unit 529 decodes the signal demodulated by the QPSK demodulator 527 and outputs the decoded DCI to the controller 405. Here, this signal is expressed in bit units, and the Viterbi decoder unit 529 also performs rate dematching in order to adjust the number of bits for which Viterbi decoding processing is performed on the input bits. When other types of coding are applied on the transmission side instead of convolutional coding for downlink ACK / NACK, downlink ACK / NACK is different from Viterbi decoding processing instead of Viterbi decoding processing. Decryption processing may be performed. In such a case, the control channel decoding unit 521 implements a decoding unit different from the Viterbi decoder unit 529.

  A detection process for the EPDCCH will be described. The terminal device 5 performs a process of detecting DCI addressed to itself, assuming a plurality of ECCE aggregation numbers. The terminal device 5 performs different decoding processing for each assumed ECCE aggregation number (coding rate) on the EPDCCH signal, and is included in the EPDCCH in which no error is detected in the CRC code added to the EPDCCH together with the DCI. Get the DCI. Such a process is called blind decoding. Note that the terminal device 5 does not perform blind decoding assuming the EPDCCH on all ECCE signals (reception signals) of the EPDCCH set configured from the base station device 3, but performs a part of the ECCE. Only blind decoding may be performed. Some ECCEs (ECCEs) in which blind decoding is performed are referred to as “Search spaces”. Also, a different search space is defined for each ECCE aggregation number. In the terminal device 5 in which a plurality of EPDCCH sets are configured, a search space is set (configured and defined) in each configured EPDCCH set.

  The search space means a logical area in which the terminal device 5 performs decoding detection of the EPDCCH in the EPDCCH set. The Search space is composed of a plurality of EPDCCH candidates. The EPDCCH candidate is a target on which the terminal device 5 performs decoding detection of the EPDCCH. For each ECCE aggregation number, different EPDCCH candidates are composed of different ECCEs (including one ECCE and a plurality of ECCEs).

  A detection process for EPHICH will be described. The terminal device 5 performs processing for detecting an EPHICH signal for an EPHICH set corresponding to the EPDCCH set that has detected the EPDCCH including the resource allocation information of the transmitted PUSCH. The terminal device 5 performs a process of detecting an EPHIICH signal with respect to an EPHICH set signal in which an EPHICH corresponding to the transmitted PUSCH is arranged. The terminal device 5 performs a process of demapping signals arranged in a plurality of DL PRB pairs in which EPHICH can be arranged to extract EPHICH signals. EPHICH uses EREG and ECCE structures. The EREG described in FIG. 14 is used for the configuration of EPHICH. For the configuration of the EPHCIH of the present invention, the ECCE described in FIGS. 18, 19, and 20, that is, the distributed mapping ECCE is used. One EPHIICH is composed of a plurality of ECCEs. In one EPHIICH, a signal generated from a plurality of ACK / NACK information can be arranged.

  The terminal device 5 performs propagation path compensation of the EPHICH signal using the second reference signal in the DL PRB pair in which the EPHICH is arranged, and performs demodulation and decoding. The terminal apparatus 5 performs demodulation of the EPHICH signal using the second reference signal in the DL PRB pair to which the resource to be demodulated belongs. EREG is previously associated with any one of the antenna ports, and the terminal device 5 performs demodulation of the EPHICH signal using the second reference signal of the antenna port determined based on the EREG constituting the EPHICH. One EREG is associated with a plurality of antenna ports, and different antenna ports are associated with each RE in the EREG alternately.

  The terminal device 5 responds to the EPHICH including the ACK / NACK for the transport block transmitted by the PUSCH together with checking whether there is an error in the decoded data (multiple ACK / NACK) transmitted by the respective EPHICH. To check. A check of whether or not it corresponds to an EPHICH including ACK / NACK for a transport block transmitted by PUSCH is performed using an identifier associated with each EPHIICH. When the terminal device 5 determines that the EPHICH includes ACK / NACK for the transport block transmitted by the PUSCH and confirms that there is no error in the data (multiple ACK / NACK) transmitted by the EPHICH, the terminal device 5 performs decoding. Among the plurality of ACKs / NACKs obtained in this way, ACK / NACK for the transport block transmitted by PUSCH is confirmed, and it is determined whether there is an error or no error in the transmitted transport block. When the terminal device 5 determines that there is an error in the transport block transmitted by the PUSCH, the terminal device 5 retransmits the transmitted transport block.

  In one downlink subframe, indexing is performed on the configured ACK / NACK. A single EPHICH includes a plurality of ACK / NACKs, and ACK / NACK indexing is performed for each EPHIICH unit. A plurality of EPHIICHs can be configured in one EPHIICH set. EPHICH indexing is performed on one or more EPHICH set units. Specifically, the EPHICH indexing is performed for each of one or more EPHICH sets associated with one EPDCCH set. An EPHICH in which ACK / NACK for data transmitted on a PUSCH is arranged is arranged in the UL PRB pair index having the smallest index among one or more UL PRB pairs used in the PUSCH and in the UL PRB pair. Are associated with each other based on the cyclic shift value of the corresponding DM RS and the corresponding offset value. The ACK / NACK for data transmitted on the PUSCH is the UL PRB having the smallest index among one or more UL PRB pairs used for the PUSCH from among a plurality of ACK / NACKs that can be arranged in the associated EPHICH. Based on the index of the pair, the cyclic shift value of the DM RS arranged in the UL PRB pair, and the corresponding offset value. For example, the terminal device 5 determines the number of EPHICH (ACK / NACK) configured in the downlink subframe based on the number of EPHICH sets set from the base station device 3. For example, the terminal device 5 may determine the number of EPHICH (ACK / NACK) configured in the downlink subframe based on the information indicating the total number of EPHICH (ACK / NACK) notified from the base station device 3. Good. The terminal device 5 determines the number of EPHICH (ACK / NACK) configured for each EPHICH set based on the information indicating the total number of EPHICH (ACK / NACK) for each EPHICH set notified from the base station device 3. Also good.

  The terminal device 5 performs a decoding process on signals arranged in a plurality of ECCEs that can form an EPHICH including ACK / NACK for a transport block transmitted by PUSCH. In EPHICH, a dedicated identifier (RNTI) is used, and an exclusive OR process using the identifier dedicated to EPHICH is performed on a CRC code generated from a plurality of ACK / NACKs. Information that has undergone exclusive OR processing is encoded and modulated together with a plurality of ACK / NACK information, and the modulated signal is placed in EPHICH.

  For example, 16 ECCEs (ECCE0, ECCE1, ECCE2, ECCE3, ECCE4, ECCE5, ECCE6, ECCE7, ECCE8, ECCE9, ECCE10, ECCE11, ECCE12, ECCE13, ECCE15, ECCE15, and ECCE15) are included in the EPHICH set. It consists of four ECCEs. For convenience of explanation, an EPHICH candidate composed of a plurality of ECCEs is referred to as an EPHICH candate. The respective EPHICH is ECCE0, ECCE1, ECCE2, and ECCE3 (EPHICH candidate0), ECCE4 and ECCE5 and ECCE6 and ECCE7 (EPHICH candidate1), ECCE8, ECCE9, ECCE10, and ECCE11c (ECHIC13 and EC12). It is configured by ECCE15 (EPHIICH candidate3). The terminal device 5 includes signals arranged in ECCE0, ECCE1, ECCE2, and ECCE3, signals arranged in ECCE4, ECCE5, ECCE6, and ECCE7, signals arranged in ECCE8, ECCE9, ECCE10, and ECCE11, and ECCE12 and ECCE13. EPHICH decoding processing is performed on the signals arranged in ECCE14 and ECCE15. The terminal device 5 checks the CRC code and the identifier corresponding to EPHICH including ACK / NACK for the transport block transmitted by PUSCH, for each data series obtained by the decoding process.

  In addition, there is no possibility that each EPHIICH is arranged in all the EPHIICH candates in the EPHIICH set, and each EPHIICH may be arranged in a limited EPHIICH candate in the EPHIICH set. For example, a case will be described where four EPHIICHs (EPHIICH0, EPHIICH1, EPHIICH2, EPHIICH3) can be used. EPHICH0 may be arranged in EPHIICH candate0 or EPHIICH candid1. EPHICH1 can be arranged in EPHIICH candid1 or EPHIICH candid2. EPHICH2 can be arranged in EPHIICH candate2 or EPHIICH candidate3. EPHICH3 can be arranged in EPHIICH candid3 or EPHIICH candidate0. Another example will be described. EPHICH0 may be arranged in EPHIICH candate0, EPHICH candidate1, or EPHIICH candidate2. EPHICH1 may be arranged in EPHIICH candid1, EPHICH candidate 2, or EPHIICH candidate 3. EPHICH2 can be arranged in EPHIICH candid2, or EPHIICH candidate3, or EPHIICH candidate0. The EPHIICH3 can be arranged in the EPHIICH candate3, the EPHIICH candate0, or the EPHIICH candate1. The EPHIICH candid in which the EPHIICH can be arranged is different for each EPHIICH identifier.

  The base station apparatus 3 determines an EPHICH used for transmitting a plurality of ACK / NACK information, determines a plurality of ECCEs in which the determined EPHICH is arranged, and uses data (a plurality of ACK / ACKs) using identifiers corresponding to the determined EPHICH. A signal generated from NACK and a CRC code subjected to exclusive OR processing using an identifier) is arranged and transmitted in a plurality of determined ECCEs.

  The control unit 405 determines whether the DCI input from the Viterbi decoder unit 529 is the DCI addressed to itself with no error, and determines that the DCI is addressed to the own device without error. 511, a data demodulating unit 523, a turbo decoding unit 525, and a transmission processing unit 407 are controlled. For example, when the DCI is a downlink assignment, the control unit 405 controls the reception processing unit 401 to decode the PDSCH signal. Note that the CRC code is included in the EPDCCH as well as the PDSCH, and the control unit 405 determines whether the DCI of the EPDCCH is incorrect using the CRC code.

  The control unit 405 determines whether or not there is an error in the ACK / NACK input from the Viterbi decoder unit 529. When determining that there is no error, the control unit 405 controls the transmission processing unit 407 based on the ACK / NACK. For example, when the ACK / NACK indicates NACK, the control unit 405 controls the transmission processing unit 407 to retransmit the transmitted PUSCH. Note that the EPHICH also includes a CRC code, and the control unit 405 determines whether there are errors in a plurality of ACK / NACKs that can be included in the EPHIICH using the CRC code.

<Transmission Processing Unit 407 of Terminal Device 5>
FIG. 6 is a schematic block diagram illustrating a configuration of the transmission processing unit 407 of the terminal device 5 according to the embodiment of the present invention. As shown in this figure, the transmission processing unit 407 includes a turbo coding unit 611, a data modulation unit 613, a DFT unit 615, an uplink reference signal processing unit 617, a physical uplink control channel processing unit 619, a subcarrier mapping unit 621, An IFFT unit 623, a GI insertion unit 625, a transmission power adjustment unit 627, a random access channel processing unit 629, a D / A unit 605, a transmission RF unit 607, and a transmission antenna 411 are configured. The transmission processing unit 407 encodes and modulates information data (transport block) and UCI, generates a signal to be transmitted using PUSCH and PUCCH, and adjusts transmission power of PUSCH and PUCCH. The transmission processing unit 407 generates a signal to be transmitted using the PRACH and adjusts the transmission power of the PRACH. The transmission processing unit 407 generates DM RSs and SRSs, and adjusts the transmission powers of the DM RSs and SRSs.

  The turbo coding unit 611 performs turbo coding for increasing the error tolerance of the data at the coding rate instructed by the control unit 405 and outputs the input information data to the data modulation unit 613. The data modulation unit 613 modulates the code data encoded by the turbo coding unit 611 using a modulation method instructed by the control unit 405, for example, a modulation method such as QPSK, 16QAM, or 64QAM, and converts the signal sequence of modulation symbols. Generate. Data modulation section 613 outputs the generated modulation symbol signal sequence to DFT section 615. The DFT unit 615 performs discrete Fourier transform on the signal output from the data modulation unit 613 and outputs the result to the subcarrier mapping unit 621.

  The physical uplink control channel processing unit 619 performs baseband signal processing for transmitting UCI input from the control unit 405. The UCI input to the physical uplink control channel processing unit 619 is ACK / NACK, SR, and CQI. The physical uplink control channel processing unit 619 performs baseband signal processing and outputs the generated signal to the subcarrier mapping unit 621. The physical uplink control channel processing unit 619 encodes UCI information bits to generate a signal.

  Also, the physical uplink control channel processing unit 619 performs signal processing related to frequency domain code multiplexing and / or time domain code multiplexing on a signal generated from UCI. For example, the physical uplink control channel processing unit 619 is instructed by the control unit 405 to use a UL PRB pair, a frequency domain code sequence, and a time domain code sequence used for a signal generated from ACK / NACK. The physical uplink control channel processing unit 619 is a control unit for realizing frequency domain code multiplexing for PUCCH signals generated from ACK / NACK information bits, SR information bits, or CQI information bits. Multiply the code sequence indicated by 405. The physical uplink control channel processing unit 619 uses a code instructed by the control unit 405 to implement time-domain code multiplexing for PUCCH signals generated from ACK / NACK information bits or SR information bits. Multiply series.

  Uplink reference signal processing section 617 generates SRS and DM RS, which are known signals in base station apparatus 3, based on an instruction from control section 405, and outputs the generated signal to subcarrier mapping section 621.

  The subcarrier mapping unit 621 outputs the signal input from the uplink reference signal processing unit 617, the signal input from the DFT unit 615, and the signal input from the physical uplink control channel processing unit 619 to the control unit 405. Are arranged on subcarriers according to instructions from, and output to IFFT section 623.

  IFFT section 623 performs fast inverse Fourier transform on the signal output from subcarrier mapping section 621 and outputs the result to GI insertion section 625. Here, the number of points in IFFT section 623 is larger than the number of points in DFT section 615, and terminal apparatus 5 uses PUSCH to transmit signals by using DFT section 615, subcarrier mapping section 621, and IFFT section 623. DFT-Spread-OFDM modulation is performed on the signal. GI insertion section 625 adds a guard interval to the signal input from IFFT section 623 and outputs the signal to transmission power adjustment section 627.

  The random access channel processing unit 629 generates a signal to be transmitted on the PRACH using the preamble sequence instructed by the control unit 405, and outputs the generated signal to the transmission power adjustment unit 627.

  The transmission power adjustment unit 627 adjusts the transmission power based on the control signal from the control unit 405 with respect to the signal input from the GI insertion unit 625 or the signal input from the random access channel processing unit 629, and performs D / Output to A section 605. Note that, in the transmission power adjustment section 627, the average transmission power of PUSCH, PUCCH, DM RS, SRS, and PRACH is controlled for each uplink subframe.

  The D / A unit 605 converts the baseband digital signal input from the transmission power adjustment unit 627 into an analog signal and outputs the analog signal to the transmission RF unit 607. The transmission RF unit 607 generates an in-phase component and a quadrature component of the intermediate frequency from the analog signal input from the D / A unit 605, and removes an extra frequency component for the intermediate frequency band. Next, the transmission RF unit 607 converts (up-converts) the intermediate frequency signal into a high frequency signal, removes excess frequency components, amplifies the power, and transmits to the base station apparatus 3 via the transmission antenna 411. Send.

  The terminal device 5 arranges and transmits the signal generated from the transport block on the PUSCH (the transmission processing unit 407 transmits the PUSCH), and receives and demodulates the signal arranged in the EPHICH set (reception processing). Unit 401 demodulates the signal of EPHICH), and determines EPHICH including ACK / NACK for the transmitted transport block from UL PRB index (Lower PRB index) used for transmitted PUSCH and cyclic shift of DM RS (The control unit 405 determines the corresponding EPHIICH), detects the signal arranged in the determined EPHIICH using the identifier used in the determined EPHIICH (the control unit 405 detects the corresponding EPHIICH signal), Is the detected EPHIICH data? ACK / NACK for the transmitted transport block is extracted (corresponding ACK / NACK is extracted from the corresponding EPHICH data by the control unit 405), and retransmission control of the PUSCH transmitted based on the extracted ACK / NACK is performed ( The control unit 405 controls retransmission of PUSCH).

  The terminal device 5 receives information indicating the configuration of one or more EPDCCH sets, and information indicating the configuration of one or more EPHICH sets (such as a plurality of DL PRB pairs configuring the EPHICH set) (the reception processing unit 401) Receive related information), determine one or more EPHICH sets associated with the EPDCCH set (the radio resource control unit 403 determines one or more EPHICH sets associated with the EPDCCH set), one or more The EPHIICH configuration and EPHICH indexing in the EPHICH set are determined (the control unit 405 determines the EPHIICH configuration and EPHIICH indexing in one or more EPHICH sets), and the EPHICH corresponding to the transmitted PUSCH EPHI where is placed CH set is determined (EPHIICH set in which the EPHICH corresponding to the PUSCH transmitted by the control unit 405 is determined is determined). Here, the configuration of the EPHICH includes the number of EPHICHs configured in one or more EPHICH sets.

  The base station device 3 receives a signal arranged on the PUSCH from the terminal device 5 (the reception processing unit 101 receives the PUSCH), and the UL PRB index and DM RS assigned to the PUSCH to which the resource is assigned to the terminal device 5. Is controlled so as to arrange an ACK / NACK for the transport block received by the PUSCH and a signal generated from the identifier corresponding to the EPHICH (radio resource control unit). 103 selects EPHICH, and control unit 105 controls based on the selected EPHIICH to select an identifier to be used for a CRC code generated from a plurality of ACK / NACK), and a plurality of EPHICH signals are arranged. Select the ECCE (the radio resource control unit 103 A plurality of ECCEs used for EPHICH to be transmitted are selected), and EPHICH in which a signal generated from ACK / NACK is arranged is transmitted using the selected ECCE (transmission processing unit 107 transmits EPHIICH).

  The base station apparatus 3 sets one or more EPHICH sets associated with the EPDCCH set (the radio resource control unit 103 sets one or more EPHICH sets associated with the EPDCCH set), and one or more EPDCCH Information indicating the configuration of a set, information indicating the configuration of one or more EPHICH sets (information indicating the configuration of one or more EPDCCH sets by the transmission processing unit 107, information indicating the configuration of one or more EPHICH sets) EPHIICH set that arranges the EPHIICH corresponding to the received PUSCH (the control unit 105 judges the EPHIICH set that arranges the EPHICH corresponding to the received PUSCH), and the EPHICH corresponding to the received PUSCH EPHIICH s judged Transmission is performed using the et signal (the transmission processing unit 107 transmits the EPHICH in the EPHICH set signal).

  As described above, in the embodiment of the present invention, a plurality of EPHICH sets are configured, a plurality of EPHICHs configured in the downlink subframe are grouped into a plurality, and each EPHICH group is configured into a different EPHICH set. By doing so, high frequency utilization efficiency can be realized. When the number of EPHICHs to be transmitted is not large according to the communication status with the terminal device 5, the base station apparatus 3 aggregates EPHICHs used for some of the EPHICH sets among all configured EPHICH sets. A resource corresponding to an EPHICH set in which no EPHICH is arranged is used for EPDCCH or PDSCH, so that the resource can be effectively used without wasting resources. When the number of EPHICHs to be transmitted is very large, the base station apparatus 3 can appropriately implement PUSCH retransmission control by arranging the EPHICHs using all the configured EPHICH sets. In the embodiment of the present invention, since the indexing is implicitly performed on the plurality of EPHICHs configured in the plurality of EPHICH sets, and the EPHICH set in which the EPHICHs of the respective indexes are implicitly associated, the base station The device 3 does not need to notify the terminal device 5 of which EPHIICH set to transmit the EPHIICH every time the EPHICH is transmitted, and can avoid an increase in overhead of control information.

  As described above, in the embodiment of the present invention, different EPHICHs are configured by associating different identifiers with different EPHICHs, and transmitting and receiving signals including identifier information arranged in the EPHICHs. As a result, the degree of freedom regarding selection of resources (one or more ECCHs) in which EPHICH is arranged in the base station apparatus 3 can be improved. For example, when a certain EPHICH set and a certain EPDCCH set are composed of the same plurality of DL PRB pairs, it is necessary to configure the EPDCCH using a certain ECCE for a certain terminal device 5 due to the restriction of the search space of the EPDCCH. In this case, the EPHICH can be arranged using an ECCE different from the ECCE.

  The characteristic means of the present invention described above can also be realized by mounting and controlling functions in an integrated circuit. That is, the integrated circuit of the present invention is an integrated circuit mounted on a terminal device that communicates with a base station device, and includes a plurality of processing units of the terminal device 5 described above. The integrated circuit of the present invention is an integrated circuit mounted on a terminal device that communicates with a base station device, and is a processor that executes the method of the terminal device 5 described above. The integrated circuit of the present invention is an integrated circuit mounted on a base station device that communicates with a plurality of terminal devices, and includes a plurality of processing units of the base station device 3 described above as constituent elements. The integrated circuit of the present invention is an integrated circuit mounted on a base station apparatus that communicates with a plurality of terminal apparatuses, and is a processor that executes the method of the base station apparatus 3 described above.

  In the embodiment of the present invention, it has been described that different identifiers are implicitly associated with each EPHICH. However, the same identifier is used for all EPHIICHs, and an operation used for exclusive OR with CRC codes. The formula may be different for each EPHIICH. The same effect as when different identifiers are used in association with each EPHICH can be realized.

  The terminal device 5 is not limited to a moving terminal, and the present invention may be realized by mounting the function of the terminal device 5 on a fixed terminal.

  In the above-described embodiment, the region (a plurality of DL PRB pairs) in which EPHICH can be arranged is defined by the term EPHICH set, but the term is described in the above-described embodiment even if it is defined by a different term. It should be noted that the present invention is applicable as long as it has the same meaning as EPHICH set.

  In addition, this invention is not limited to the above-mentioned embodiment. In the embodiment, a terminal device is described as an example of a communication device. However, the present invention is not limited to this, and a stationary or non-movable electronic device installed indoors or outdoors, such as an AV device, for example. Needless to say, the present invention can be applied to terminal devices or communication devices such as kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other daily life equipment.

  The operations described in the embodiments of the present invention may be realized by a program. The program that operates in the terminal device 5 and the base station device 3 related to the present invention is a program (a program that causes a computer to function) that controls the CPU and the like so as to realize the functions of the above-described embodiments related to the present invention. Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU, and corrected and written as necessary. As a recording medium for storing the program, a semiconductor medium (for example, ROM, nonvolatile memory card, etc.), an optical recording medium (for example, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (for example, magnetic tape, Any of a flexible disk etc. may be sufficient. In addition, by executing the loaded program, not only the functions of the above-described embodiment are realized, but also based on the instructions of the program, the processing is performed in cooperation with the operating system or other application programs. The functions of the invention may be realized.

  In addition, when distributing to the market, the program can be stored and distributed in a portable recording medium, or transferred to a server computer connected via a network such as the Internet. In this case, the storage device of the server computer is also included in the present invention. Moreover, you may implement | achieve part or all of the terminal device 5 and the base station apparatus 3 in embodiment mentioned above as LSI which is typically an integrated circuit. Each functional block of the terminal device 5 and the base station device 3 may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used. Each functional block of the terminal device 5 and the base station device 3 may be realized by a plurality of circuits.

  Information and signals may be presented using a variety of different techniques and methods. For example, chips, symbols, bits, signals, information, commands, instructions, and data that may be referred to throughout the above description may be indicated by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or light particles, or combinations thereof .

  Various exemplary logic blocks, processing units, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or a combination of both. To clearly illustrate this synonym between hardware and software, various illustrative elements, blocks, modules, circuits, and steps have been described generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in a variety of ways for each specific application, but such implementation decisions should not be construed as departing from the scope of this disclosure.

  Various exemplary logic blocks, processing units described in connection with the disclosure herein are general purpose processors, digital signal processors (DSPs) designed to perform the functions described herein. , Application specific integrated circuit (ASIC), field programmable gate array signal (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or combinations thereof . A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices. For example, a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors connected to a DSP core, or a combination of other such configurations.

  The method or algorithm steps described in connection with the disclosure herein may be directly embodied by hardware, software modules executed by a processor, or a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any form of recording medium known in the art. A typical recording medium may be coupled to the processor such that the processor can read information from, and write information to, the recording medium. In the alternative, the recording medium may be integral to the processor. The processor and the recording medium may be in the ASIC. The ASIC can be in the terminal device (user terminal). Or a processor and a recording medium may exist in the terminal device 5 as a discrete element.

  In one or more exemplary designs, the functions described may be implemented in hardware, software, firmware, or a combination thereof. If implemented by software, the functions may be maintained or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media includes both communication media and computer recording media including media that facilitate carrying a computer program from one place to another. The recording medium may be any commercially available medium that can be accessed by a general purpose or special purpose computer. By way of example and not limitation, such computer readable media may be RAM, ROM, EEPROM, CDROM or other optical disc media, magnetic disc media or other magnetic recording media, or general purpose or It can include media that can be accessed by a special purpose computer or general purpose or special purpose processor and used to carry or retain the desired program code means in the form of instructions or data structures. Any connection is also properly termed a computer-readable medium. For example, if the software uses a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology such as infrared, wireless, or microwave, a website, server, or other remote source When transmitting from, these coaxial cables, fiber optic cables, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the definition of the medium. The discs (disk, disc) used in the present specification include compact discs (CD), laser discs (registered trademark), optical discs, digital versatile discs (DVD), floppy (registered trademark) discs, and Blu-ray discs. The disk generally reproduces data magnetically, while the disk optically reproduces data with a laser. Combinations of the above should also be included on the computer-readable medium.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design and the like within the scope not departing from the gist of the present invention are also claimed. Included in the range.

3 Base station apparatus 4 (A to C) RRH
5 (A to C) Terminal device 101 Reception processing unit 103 Radio resource control unit 105 Control unit 107 Transmission processing unit 109 Reception antenna 111 Transmission antenna 201 Shared channel processing unit 203 Control channel processing unit 205 Downlink reference signal processing unit 207 Multiplexing unit 209 IFFT section 211 GI insertion section 213 D / A section 215 Transmission RF section 219 Turbo coding section 221 Data modulation section 223 Convolution coding section 225 QPSK modulation section 227 Precoding processing section (for EPDCCH and EPHICH)
229 Precoding processing unit (for PDSCH)
231 Precoding processing unit (for downlink reference signal)
301 reception RF unit 303 A / D unit 309 symbol timing detection unit 311 GI removal unit 313 FFT unit 315 subcarrier demapping unit 317 propagation channel estimation unit 319 propagation channel equalization unit (for PUSCH)
321 Channel equalization unit (for PUCCH)
323 IDFT unit 325 Data demodulation unit 327 Turbo decoding unit 329 Physical uplink control channel detection unit 331 Preamble detection unit 333 SRS processing unit 401 reception processing unit 403 radio resource control unit 405 control unit 407 transmission processing unit 409 reception antenna 411 transmission antenna 501 Reception RF unit 503 A / D unit 505 Symbol timing detection unit 507 GI removal unit 509 FFT unit 511 Demultiplexing unit 513 Channel estimation unit 515 Channel compensation unit (for PDSCH)
517 Shared channel decoding unit 519 Propagation path compensation unit (for EPDCCH, EPHIICH)
521 Control channel decoding unit 523 Data demodulation unit 525 Turbo decoding unit 527 QPSK demodulation unit 529 Viterbi decoder unit 533 Demapping unit 605 D / A unit 607 Transmission RF unit 611 Turbo coding unit 613 Data modulation unit 615 DFT unit 617 Uplink reference signal Processing unit 619 Physical uplink control channel processing unit 621 Subcarrier mapping unit 623 IFFT unit 625 GI insertion unit 627 Transmission power adjustment unit 629 Random access channel processing unit

Claims (5)

A terminal device that communicates with a base station device,
A transmission processing unit that arranges a signal generated from the transport block on the PUSCH and transmits the signal to the base station apparatus;
A control unit that determines an identifier used for EPHICH including data including ACK / NACK for the transport block based on an index of UL PRB used for the PUSCH and a cyclic shift of DM RS;
A reception processing unit that demodulates a signal arranged in an EPHICH set in which the EPHICH is configured, decodes the demodulated signal, and outputs data obtained by decoding to the control unit;
The terminal device according to claim 1, wherein the control unit determines whether the data input from the reception processing unit corresponds to the identifier. A base station device that communicates with a plurality of terminal devices,
A reception processing unit that receives a signal placed on the PUSCH from the terminal device;
The EPHICH corresponding to the UL PRB index and DM RS cyclic shift allocated to the PUSCH to which resources are allocated to the terminal apparatus, the ACK / NACK for the transport block received on the PUSCH, and the EPHICH A control unit that controls to arrange a signal generated from a corresponding identifier;
A transmission processing unit that generates a transmission signal from an ACK / NACK for the transport block received by the PUSCH and an identifier corresponding to the EPHICH, and transmits the generated signal by arranging the EPHICH;
A base station apparatus characterized in that a different identifier is associated with each EPHICH. A communication method used for a terminal device that communicates with a base station device,
Placing the signal generated from the transport block on the PUSCH and transmitting it to the base station apparatus;
Determining an identifier used for EPHICH including data consisting of ACK / NACK for the transport block based on an index of UL PRB used for the PUSCH and a cyclic shift of DM RS;
Demodulating a signal arranged in an EPHICH set in which the EPHICH is configured, and decoding the demodulated signal to obtain data;
Determining whether or not the acquired data corresponds to the determined identifier. A communication method comprising: An integrated circuit mounted on a terminal device that communicates with a base station device,
A transmission processing unit that arranges a signal generated from the transport block on the PUSCH and transmits the signal to the base station apparatus;
A control unit that determines an identifier used for EPHICH including data including ACK / NACK for the transport block based on an index of UL PRB used for the PUSCH and a cyclic shift of DM RS;
A reception processing unit that demodulates a signal arranged in an EPHICH set in which the EPHICH is configured, decodes the demodulated signal, and outputs data obtained by decoding to the control unit;
The integrated circuit according to claim 1, wherein the control unit determines whether the data input from the reception processing unit corresponds to the identifier. A communication system comprising a plurality of terminal devices and a base station device that communicates with the plurality of terminal devices,
The terminal device
A first transmission processing unit configured to transmit the signal generated from the transport block to the base station apparatus by placing the signal on the PUSCH;
A first controller that determines an identifier used for EPHICH including data consisting of ACK / NACK for the transport block based on an index of UL PRB used for the PUSCH and a cyclic shift of DM RS;
A first reception processing unit that demodulates a signal arranged in an EPHICH set in which the EPHICH is configured, decodes the demodulated signal, and outputs data obtained by decoding to the control unit; Have
The base station device
A second reception processing unit for receiving a signal placed on the PUSCH from the terminal device;
A second transmission processing unit for generating a transmission signal from ACK / NACK for the transport block received by the PUSCH received by the second reception processing unit, and arranging the generated signal in EPHICH for transmission; Have
The communication system, wherein the first control unit determines whether data input from the first reception processing unit corresponds to the determined identifier.