JP2013255136A - Communication system, mobile station device, base station device, communication method, and integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to efficiently transmit and receive signals including uplink control information between a base station device and a mobile station device.SOLUTION: An eREG is formed from a plurality of resources into which one DL PRB pair is divided, an eCCE is formed from the aggregation of a plurality of eREGs, and a second PDCCH is formed from the aggregation of one or more eCCEs. As a mapping method of the eREG applied to an eCCE, any one of localized mapping or distributed mapping is applied to the second PDCCH. Regarding associating a PUCCH resource with the eCCE, different associating rules are applied to the respective methods. A mobile station device includes a first control unit for selecting a PUCCH resource used for transmission on the basis of a mapping method applied to a second PDCCH destined to its own device, and an eCCE forming the second PDCCH destined to the own device.

Description

  The present invention efficiently configures a downlink control channel in a communication system including a plurality of mobile station apparatuses and a base station apparatus, and the mobile station apparatus efficiently controls uplink control information for the base station apparatus. A communication system, a mobile station apparatus, a base station apparatus, a communication method, and an integration, in which a base station apparatus can efficiently receive a signal including uplink control information from the mobile station apparatus. Regarding the circuit.

  The evolution of cellular mobile radio access methods and 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, which is multicarrier transmission, is used as a communication system (downlink; referred to as DL) from a base station apparatus to a mobile station apparatus. . In LTE, a single-carrier transmission SC-FDMA (Single-Carrier Frequency Division Multiple Access) system is used as a communication system (uplink; referred to as UL) from a mobile station apparatus to a base station apparatus. Used. In LTE, a DFT-Spread OFDM (Discrete Fourier Transform-Spread OFDM) system is used as an SC-FDMA system.

  LTE-A (LTE-Advanced), which 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), Physical Uplink Shared Channel (PUSCH) used for transmission / reception of uplink data and control information, Physical Uplink Control Channel (Physical Uplink Control CHannel for transmission / reception of control information) : PUCCH), synchronization channel used for downlink synchronization establishment (Synchronization CHannel: SCH), physical random access channel (Physical Random Access CHannel: PRACH) used for establishment of uplink synchronization, downlink system Physical broadcast channel (Physica used for information transmission) l Broadcast CHannel (PBCH). A mobile station apparatus or a base station apparatus arranges and transmits a signal generated from control information, data, and the like on 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 (acknowledgement: ACK) or negative acknowledgment (acknowledgment: NACK) for data arranged in the received physical downlink shared channel (acknowledgement: NACK), Alternatively, it is control information (Scheduling Request: SR) indicating a request for uplink resource allocation, or control information (Channel Quality Indicator: CQI) indicating downlink reception quality (also referred to as channel quality).

<Collaborative communication>
In order to reduce or suppress interference with the mobile station apparatus in the cell edge area, or to increase received signal power, LTE and LTE-A, inter-cell cooperation that performs communication in cooperation between adjacent cells. Application of communication (Cooperative Multipoint: CoMP communication) is under consideration. For example, a mode in which the base station apparatus communicates using any one frequency band is referred to as a “cell”. For example, as inter-cell cooperative communication, different weighting signal processing (precoding processing) is applied to a signal in a plurality of cells, and a plurality of base station devices cooperates to transmit the signal to the same mobile station device (Joint Processing, also called Joint Transmission). In this method, the signal power to interference noise power ratio of the mobile station apparatus can be improved, and reception characteristics in the mobile station apparatus can be improved. For example, as a cooperative communication between cells, a method (Coordinated Scheduling: CS) in which scheduling is performed for a mobile station device in cooperation with a plurality of cells has been studied. In this method, the signal power to interference noise power ratio of the mobile station apparatus can be improved. For example, as a cooperative communication between cells, a method (Coordinated beamforming: CB) in which a signal is transmitted to a mobile station apparatus by applying beamforming in cooperation with a plurality of cells has been studied. In this method, the signal power to interference noise power ratio of the mobile station apparatus can be improved. For example, as inter-cell cooperative communication, a method (Blanking, Muting) in which a signal is transmitted using a predetermined resource only in one cell and a signal is not transmitted using a predetermined resource in one cell has been studied. In this method, the signal power to interference noise power ratio of the mobile station apparatus can be improved.

  In addition, regarding a plurality of cells used for cooperative communication, different cells may be configured by different base station devices, and different cells are different than different RRHs (Remote Radio Heads, base station devices managed by the same base station device). The outdoor type radio unit, also called Remote Radio Unit: RRU), or a different cell may be constituted by a base station apparatus and an RRH managed by the base station apparatus. The base station apparatus and the base station apparatus may be configured by RRH managed by a different base station apparatus.

  A base station apparatus with a wide coverage is generally called a macro base station apparatus. A base station apparatus with a narrow coverage is generally called a pico base station apparatus or a femto base station apparatus. RRH is generally considered to be used in an area where the coverage is narrower than that of a macro base station apparatus. A deployment such as a communication system configured by a macro base station apparatus and an RRH, and a coverage supported by the macro base station apparatus including a part or all of the coverage supported by the RRH is a heterogeneous network deployment. It is called. In such a heterogeneous network-deployed communication system, a method in which a macro base station apparatus and an RRH cooperatively transmit signals to mobile station apparatuses located within the overlapping coverage is being studied. Here, RRH is managed by the macro base station apparatus, and transmission / reception is controlled. Note that the macro base station apparatus and the RRH are connected by a wired line such as an optical fiber or a wireless line using a relay technology. As described above, the macro base station apparatus and the RRH perform cooperative communication using radio resources that are partially or entirely the same, so that the overall frequency use efficiency in the coverage area constructed by the macro base station apparatus is increased. (Transmission capacity) can be improved.

  When the mobile station apparatus is located in the vicinity of the macro base station apparatus or RRH, the mobile station apparatus can perform single cell communication with the macro base station apparatus or RRH. That is, a certain mobile station apparatus communicates with a macro base station apparatus or RRH, without using cooperative communication, and transmits / receives a signal. For example, the macro base station apparatus receives an uplink signal from a mobile station apparatus that is close in distance to itself. For example, the RRH receives an uplink signal from a mobile station apparatus that is close in distance to the own apparatus. Furthermore, when the mobile station apparatus is located near the edge of the coverage constructed by the RRH (cell edge), it is necessary to take measures against co-channel interference from the macro base station apparatus. As a multi-cell communication (cooperative communication) between a macro base station apparatus and an RRH, a method of reducing or suppressing interference with a mobile station apparatus in a cell edge region by using a CoMP scheme in which adjacent base station apparatuses cooperate with each other has been studied. Yes.

  In the downlink, the mobile station apparatus receives signals transmitted from both the macro base station apparatus and the RRH using cooperative communication. In the uplink, the mobile station apparatus receives either the macro base station apparatus or the RRH. Therefore, it is considered to transmit signals in a suitable form. For example, the mobile station apparatus transmits an uplink signal with transmission power suitable for reception of a signal by the macro base station apparatus. For example, the mobile station apparatus transmits an uplink signal with transmission power suitable for receiving a signal by RRH. Thereby, unnecessary interference in the uplink can be reduced and frequency use efficiency can be improved.

  In the mobile station apparatus, regarding the data signal reception processing, it is necessary to acquire control information indicating the modulation scheme, coding rate, spatial multiplexing number, transmission power adjustment value, resource allocation, etc. used for the data signal. For LTE and LTE-A, introduction of a new control channel (enhanced Physical Downlink Control Channel: ePDCCH) that transmits control information related to data signals is being studied (non-patent document). Reference 1). For example, improving the overall control channel capacity is being considered. For example, support for frequency domain interference coordination for enhanced physical downlink control channels is under consideration. For example, it has been considered to support spatial multiplexing for an enhanced physical downlink control channel. For example, it is considered to support beamforming for an enhanced physical downlink control channel. For example, it is considered to support diversity for an enhanced physical downlink control channel. For example, the use of enhanced physical downlink control channels with new types of carriers is being considered. For example, in a new type of carrier, it is considered that a reference signal that is common to all mobile station apparatuses in a cell is not transmitted. For example, in a new type of carrier, it is considered to reduce the transmission frequency of a reference signal that is common to all mobile station apparatuses in a cell as compared with the conventional case. For example, in a new type of carrier, it is considered to demodulate a signal such as control information using a unique reference signal in a mobile station apparatus.

  For example, as an application of beamforming, it is considered to apply cooperative communication and multi-antenna transmission to an enhanced physical downlink control channel. Specifically, a plurality of base station apparatuses and a plurality of RRHs apply precoding processing to the enhanced physical downlink control channel signal, and demodulate the enhanced physical downlink control channel signal. The same precoding process is also being applied to a reference signal (RS) for this purpose. Specifically, a plurality of base station apparatuses and a plurality of RRHs arrange and transmit the enhanced physical downlink control channel and RS to which the same precoding process is applied in the resource area where the PDSCH is arranged. It is being considered. The mobile station apparatus demodulates the received physical downlink control channel signal that has been subjected to the same precoding process by using the received RS that has been subjected to the precoding process, and obtains control information. To be considered. This method eliminates the need for exchanging information about precoding processing applied to the enhanced physical downlink control channel signal between the base station apparatus and the mobile station apparatus.

  For example, as an application of diversity, a method of obtaining a frequency diversity effect by configuring a signal of a physical downlink control channel enhanced by using resources separated in a frequency domain has been studied. On the other hand, when applied to a physical downlink control channel with enhanced beamforming, a method of configuring a signal of the enhanced physical downlink control channel using resources that are not separated in the frequency domain is being studied.

  A mapping method for resources constituting an enhanced physical downlink control channel is being studied. It has been studied that a unit of mapping of resources constituting one enhanced physical downlink control channel is a set of a predetermined number of physical resource block pairs (Non-Patent Document 2). For example, a set of a plurality of physical resource block pairs, which are units of mapping of resources constituting one enhanced physical downlink control channel, is an enhanced Physical Downlink Control Channel Set: ePDCCH set). In Non-Patent Document 2, it is considered to configure a plurality of enhanced physical downlink control channels composed of a predetermined number of physical resource block pairs for a mobile station apparatus. For example, in a plurality of mobile station apparatuses in which a plurality of enhanced physical downlink control channel sets are configured, some of the enhanced physical downlink control channel sets are configured by a plurality of common physical resource block pairs and are different. It is considered that some enhanced physical downlink control channel sets are composed of different physical resource block pairs. It is considered that the mobile station apparatus performs a decoding process for detecting an enhanced physical downlink control channel in each of a plurality of configured enhanced physical downlink control channel sets.

  In addition, it is considered to support a mixture of a plurality of enhanced physical downlink control channels to which different resource mapping methods are applied in a certain enhanced physical downlink control channel set. Resource mapping method for configuring an enhanced physical downlink control channel from resources in one physical resource block pair, and resource mapping for configuring an enhanced physical downlink control channel from resources in a plurality of physical resource block pairs It is considered to support a mixture of these methods within a physical resource block pair.

  Meanwhile, a method for allocating physical uplink control channel resources used for transmission / reception of ACK / NACK to a physical downlink shared channel to which resources are allocated according to downlink control information transmitted / received using the enhanced physical downlink control channel has been studied. (Non-patent Document 3). Logical resource (enhanced control channel element: eCCE) number used for enhanced physical downlink control channel without signaling explicitly indicating physical uplink control channel resource Based on the above, a method for implicitly determining the physical uplink control channel resource has been studied.

  In existing physical downlink control channels, logical resources (Control Channel Element: CCE) used for physical downlink control channels without using signaling that explicitly indicates physical uplink control channel resources A method is used in which the resource of the physical uplink control channel is implicitly determined based on the number. Even in the enhanced physical downlink control channel, a logical resource (enhanced control channel) used for the enhanced physical downlink control channel is used without signaling that explicitly indicates the resource of the physical uplink control channel. It has been studied to use a method of implicitly determining physical uplink control channel resources based on the number of the element (enhanced Control Channel Element: eCCE).

  In the method of implicitly determining the physical uplink control channel resource described above, a plurality of physical uplink control channel resources are reserved in the uplink in advance. Among the reserved resources, the resource actually used for transmission / reception of the uplink control information for each subframe is the control channel element of the physical downlink control channel used for each subframe or the enhanced physical downlink. Depends on the enhanced control channel element of the link control channel.

3GPP TSG RAN1 # 66bis, Zhuhai, China, 10-14, October, 2011, R1-113589 “Way Forward on downlink control channel enhancements by UE-specific RS” 3GPP TSG RAN1 # 69, Prague, Czech Republic, 21-25, May, 2012, R1-121976 “Design Principle for E-PDCCH Multiplexing” 3GPP TSG RAN1 # 69, Prague, Czech Republic, 21-25, May, 2012, R1-123013 “WF on PUCCH Format 1a / 1b resource allocation for ePDCCH based HARQ-ACKs”

  However, in the conventional examination, a case where a plurality of enhanced physical downlink control channels to which different resource mapping methods are applied coexists in a certain enhanced physical downlink control channel set is not sufficiently studied. An enhanced physical downlink control channel to which a resource mapping method that configures an enhanced physical downlink control channel from resources in one physical resource block pair is applied, and a plurality of enhanced physical downlink control channels. Implicit based on control channel elements with enhanced physical uplink control channel resources when mixed with enhanced physical downlink control channels to which resource mapping methods composed of resources in physical resource block pairs are applied Applying a method that is judged automatically is not fully considered.

  Enhanced physical downlink control channel by separately reserving and preparing physical uplink control channel resources for each different enhanced physical downlink control channel to which different resource mapping methods are applied A plurality of physical uplink control channel resources for an enhanced physical downlink control channel and a plurality of enhanced physical downlink control channels. Collision between physical uplink control channel resources and enhanced physical downlink control channels to which the resource mapping method composed of resources in the physical resource block pair is applied can be avoided, but increases overhead. ,system's Yapashiti is degraded

  The present invention has been made in view of the above points, and an object of the present invention is to efficiently configure a downlink control channel in a communication system including a plurality of mobile station apparatuses and a base station apparatus. Can efficiently transmit a signal including uplink control information to the base station apparatus, and the base station apparatus can efficiently receive a signal including uplink control information from the mobile station apparatus. The present invention relates to a communication system, a mobile station device, a base station device, a communication method, and an integrated circuit.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, in the communication system of the present invention, a plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a plurality of one physical resource block pair is formed. A first element is composed of resources divided into two, a second element is composed of a plurality of sets of the first elements, and a downlink control channel is composed of a set of one or more second elements. As the first element mapping method applied to the second element, one second element is configured from a set of a plurality of the first elements in one physical resource block pair. A second mapping method, or a second element in which one second element is configured from a set of a plurality of first elements in a plurality of physical resource block pairs Any of the mapping methods is applied to the downlink control channel, and the uplink control channel resource corresponds to each of the second elements, and the plurality of mobile station apparatuses, the plurality of mobile station apparatuses, and the downlink control A communication system including a base station apparatus that performs communication using a channel and the uplink control channel, wherein the first mapping method relates to the association between the uplink control channel resource and the second element. Different association rules are used in the case where the second mapping method is applied and the case where the second mapping method is applied, and the base station apparatus performs the first control on the downlink control channel used for the mobile station apparatus. One mapping method or the second mapping method is set, and one or more of the downlink control channels are configured An uplink control channel received from the mobile station device based on a first element mapping method applied to the set second element and one or more set second elements A second radio resource control unit configured to set a resource of the second radio signal and a second transmission process of transmitting a signal to the mobile station apparatus using the downlink control channel set by the second radio resource control unit And a second reception processing unit that receives a signal from the mobile station apparatus using the uplink control channel resource set by the second radio resource control unit, and the mobile station apparatus Performs a process of detecting a downlink control channel addressed to the own device, detects a first element mapping method applied to the second element applied to the detected downlink control channel, and detects the first element mapping method. A first reception processing unit for detecting one or more second elements constituting the issued downlink control channel, and a first reception processing unit applied to the downlink control channel detected by the first reception processing unit. Based on the mapping method of the first element applied to the second element and one or more second elements constituting the downlink control channel, the resources of the uplink control channel to be transmitted to the base station apparatus are A first control unit that selects, and a first transmission processing unit that transmits a signal to the base station apparatus using the resource of the uplink control channel selected by the first control unit. It is characterized by that.

  (2) In the communication system of the present invention, the uplink control channel is used for transmission / reception of a reception confirmation response, and the reception confirmation response is a downlink shared channel in which resource allocation information is indicated by the downlink control channel. It is a reception confirmation response to data.

  (3) In the communication system of the present invention, the uplink control channel resource to which the second element of the second mapping method corresponds is any one of the plurality of first elements constituting the second element. It is an uplink control channel resource corresponding to any one of a plurality of second elements of the first mapping method configured to be used.

  (4) In the communication system of the present invention, a plurality of uplink control channel resources corresponding to a second element of the plurality of first mapping methods in one downlink control channel region, A plurality of uplink control channel resources to which the second element of the second mapping method corresponds is composed of a plurality of common resources.

  (5) In the mobile station apparatus of the present invention, a plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and one physical resource block pair is A first element is composed of a plurality of divided resources, a second element is composed of a plurality of sets of the first elements, and a downlink control channel is composed of one or more sets of the second elements. As the first element mapping method configured and applied to the second element, one second element is configured from a set of a plurality of the first elements in one physical resource block pair. Or a second mapping in which one second element is configured from a set of a plurality of the first elements in the plurality of physical resource block pairs. Is applied to the downlink control channel, the uplink control channel resource corresponds to each of the second elements, and the base station apparatus, the downlink control channel, and the uplink control channel are used. Mobile station apparatus that performs communication in which the first mapping method is applied and the second mapping method is applied to the association between the uplink control channel resource and the second element A first element applied to a second element applied to the detected downlink control channel, in which a different association rule is used, and a process for detecting a downlink control channel addressed to the own apparatus is performed. And a first reception processing unit for detecting one or more second elements constituting the detected downlink control channel; A mapping method of a first element applied to a second element applied to the downlink control channel detected by the first reception processing unit, and one or more first elements constituting the downlink control channel; A first control unit that selects an uplink control channel resource to be transmitted to the base station device based on two elements, and the uplink control channel resource selected by the first control unit. And a first transmission processing unit that transmits a signal to the base station apparatus.

  (6) In the mobile station apparatus of the present invention, the uplink control channel is used for transmission / reception of a reception confirmation response, and the reception confirmation response is a downlink shared channel in which resource allocation information is indicated by the downlink control channel It is a reception confirmation response to the data of.

  (7) In the mobile station apparatus of the present invention, the uplink control channel resource to which the second element of the second mapping method corresponds is one of a plurality of first elements constituting the second element It is a resource of an uplink control channel corresponding to any one of a plurality of second elements of the first mapping method configured by using.

  (8) In the mobile station apparatus of the present invention, a plurality of uplink control channel resources corresponding to the second elements of the plurality of first mapping methods in one downlink control channel region, The plurality of uplink control channel resources to which the second element of the second mapping method corresponds is composed of a plurality of common resources.

  (9) In the base station apparatus of the present invention, a plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and one physical resource block pair is A first element is composed of a plurality of divided resources, a second element is composed of a plurality of sets of the first elements, and a downlink control channel is composed of one or more sets of the second elements. As the first element mapping method configured and applied to the second element, one second element is configured from a set of a plurality of the first elements in one physical resource block pair. Or a second mapping in which one second element is configured from a set of a plurality of the first elements in the plurality of physical resource block pairs. Any of the transmission methods is applied to the downlink control channel, and the uplink control channel resource corresponds to each of the second elements, and a plurality of mobile station apparatuses, the downlink control channel, and the uplink control channel A base station apparatus that performs communication using the first mapping method and the second mapping method are applied to the association between the uplink control channel resource and the second element Different association rules are used, and the first mapping method or the second mapping method is set for the downlink control channel used for the mobile station apparatus, and the downlink Method of mapping first element to be applied to set second element by setting one or more second elements constituting control channel Based on the set one or more second elements, the second radio resource control unit that sets the resource of the uplink control channel received from the mobile station apparatus, and the second radio resource control unit are set. A second transmission processing unit for transmitting a signal to the mobile station apparatus using the downlink control channel, and a resource for the uplink control channel set by the second radio resource control unit. And a second reception processing unit for receiving a signal from the mobile station apparatus.

  (10) In the communication method of the present invention, a plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a plurality of the physical resource block pairs are arranged. A first element is composed of resources divided into a plurality of elements, a second element is composed of a plurality of sets of the first elements, and a downlink control channel is composed of a set of one or more second elements. As the first element mapping method applied to the second element, one second element is configured from a set of a plurality of the first elements in one physical resource block pair. A first mapping method, or a second map in which one second element is configured from a plurality of sets of the first elements in the plurality of physical resource block pairs. Is applied to the downlink control channel, the uplink control channel resource corresponds to each of the second elements, and the base station apparatus, the downlink control channel, and the uplink control channel are used. A communication method used for a mobile station apparatus that performs communication in which the first mapping method is applied and the second mapping is associated with an association between an uplink control channel resource and a second element Different association rules are used when the method is applied, a process for detecting a downlink control channel addressed to the own apparatus is performed, and applied to the second element applied to the detected downlink control channel. And detecting one or more second elements constituting the detected downlink control channel. A first element mapping method applied to the detected second element applied to the downlink control channel, and one or more second elements constituting the downlink control channel And, based on, selecting a resource of the uplink control channel to be transmitted to the base station apparatus, and transmitting a signal to the base station apparatus using the selected resource of the uplink control channel It is characterized by including.

  (11) In the communication method of the present invention, a plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a plurality of the physical resource block pairs are arranged. A first element is composed of resources divided into a plurality of elements, a second element is composed of a plurality of sets of the first elements, and a downlink control channel is composed of a set of one or more second elements. As the first element mapping method applied to the second element, one second element is configured from a set of a plurality of the first elements in one physical resource block pair. A first mapping method, or a second map in which one second element is configured from a plurality of sets of the first elements in the plurality of physical resource block pairs. Any of the transmission methods is applied to the downlink control channel, and the uplink control channel resource corresponds to each of the second elements, and a plurality of mobile station apparatuses, the downlink control channel, and the uplink control channel A communication method used for a base station apparatus that performs communication using the first mapping method and the second mapping method for associating an uplink control channel resource with a second element Different mapping rules are used when different mapping methods are applied, and the first mapping method or the second mapping method is set for the downlink control channel used for the mobile station apparatus. And setting one or more second elements constituting the downlink control channel, and applying the first element applied to the set second element A step of setting up an uplink control channel resource received from the mobile station apparatus based on a prime mapping method and one or more set second elements; and a signal using the set downlink control channel Transmitting to the mobile station apparatus and receiving a signal from the mobile station apparatus using the configured uplink control channel resource.

  (12) In the integrated circuit of the present invention, a plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a plurality of the physical resource block pairs are provided. A first element is composed of resources divided into a plurality of elements, a second element is composed of a plurality of sets of the first elements, and a downlink control channel is composed of a set of one or more second elements. As the first element mapping method applied to the second element, one second element is configured from a set of a plurality of the first elements in one physical resource block pair. A first mapping method, or a second map in which one second element is configured from a plurality of sets of the first elements in the plurality of physical resource block pairs. Is applied to the downlink control channel, the uplink control channel resource corresponds to each of the second elements, and the base station apparatus, the downlink control channel, and the uplink control channel are used. An integrated circuit mounted on a mobile station apparatus that performs communication, and the first mapping method is applied to the second control element in association with the uplink control channel resource and the second element. Different mapping rules are used when the mapping method is applied, processing for detecting a downlink control channel addressed to the own device is performed, and applied to the detected second element applied to the downlink control channel And detecting one or more second elements constituting the detected downlink control channel. A first reception processing unit, a first element mapping method applied to a second element applied to the downlink control channel detected by the first reception processing unit, and the downlink control channel A first control unit that selects a resource of an uplink control channel to be transmitted to the base station apparatus based on one or more second elements that constitute the base station, and the uplink selected by the first control unit And a first transmission processing unit that transmits a signal to the base station apparatus using a resource of a link control channel.

  (13) In the integrated circuit of the present invention, a plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a plurality of the physical resource block pairs are provided. A first element is composed of resources divided into a plurality of elements, a second element is composed of a plurality of sets of the first elements, and a downlink control channel is composed of a set of one or more second elements. As the first element mapping method applied to the second element, one second element is configured from a set of a plurality of the first elements in one physical resource block pair. A first mapping method, or a second map in which one second element is configured from a plurality of sets of the first elements in the plurality of physical resource block pairs. Any of the transmission methods is applied to the downlink control channel, and the uplink control channel resource corresponds to each of the second elements, and a plurality of mobile station apparatuses, the downlink control channel, and the uplink control channel When the first mapping method is applied to the association between the uplink control channel resource and the second element, the integrated circuit is implemented in a base station apparatus that performs communication using Different mapping rules are used when the second mapping method is applied, and the first mapping method or the second mapping method is used for the downlink control channel used for the mobile station apparatus. Set, set one or more second elements constituting the downlink control channel, and apply the first element applied to the set second element A second radio resource control unit configured to set a resource of an uplink control channel received from the mobile station device based on a prime mapping method and one or more set second elements; and the second radio resource A second transmission processing unit configured to transmit a signal to the mobile station apparatus using the downlink control channel set by the control unit; and the uplink control channel set by the second radio resource control unit. And a second reception processing unit that receives a signal from the mobile station apparatus using the above-described resources.

  In the present specification, an improvement of a communication system, a mobile station apparatus, a base station apparatus, a communication method, and an integrated circuit in which a region where a control channel may be arranged for the mobile station apparatus is set by the base station apparatus However, the communication method to which the present invention is applicable is not limited to a communication method that is upward compatible with LTE, such as LTE or LTE-A. For example, the present invention can be applied to UMTS (Universal Mobile Telecommunications System).

  According to the present invention, the mobile station apparatus can efficiently transmit a signal including uplink control information to the base station apparatus, and the base station apparatus can efficiently transmit uplink control information from the mobile station apparatus. 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 mobile station apparatus 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 mobile station apparatus 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 mobile station apparatus 5 which concerns on embodiment of this invention. It is a flowchart which shows an example of the process in connection with the setting of the PUCCH resource offset for every 2nd PDCCH area | region of the mobile station apparatus 5 which concerns on embodiment of this invention. FIG. 8 is a flowchart illustrating an example of processing related to the setting of the PUCCH resource offset for each second PDCCH region of the base station device 3 according to the embodiment of the present 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, or RRH4 to the mobile station apparatus 5. FIG. It is a figure which shows an example of arrangement | positioning of the downlink 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 downlink 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 DL PRB pair by which CSI-RS for 8 antenna ports (reference signal for a transmission-path condition measurement) was mapped. It is a figure which shows schematic structure of the time frame of the uplink from the mobile station apparatus 5 which concerns on embodiment of this invention to the base station apparatus 3, RRH4. It is a figure which shows the structure and number of the resource of PUCCH for ACK / NACK of the communication system which concerns on embodiment of this invention. It is a figure explaining the logical relationship of 1st PDCCH and CCE of the communication system 1 which concerns on embodiment of this invention. It is a figure which shows the example of arrangement | positioning of the resource element group 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 schematic structure of a 2nd PDCCH area | region in the communication system 1 which concerns on embodiment of this invention. It is a figure explaining the logical relationship of 2nd PDCCH and E-CCE of the communication system 1 which concerns on 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 a structure of eREG of 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 explaining an example of monitoring of the 2nd PDCCH of the mobile station apparatus 5 which concerns on 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, embodiments of the present invention will be described in detail with reference to the drawings. The overall image of the communication system according to the present embodiment, the configuration of the 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. 9 is a diagram illustrating an 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 base station device (eNodeB, NodeB, BS: Base Station, AP: Access Point; also called an access point, macro base station) 3 and a plurality of RRHs (Remote Radio Head, Base 4) 4A, 4B, 4C, and a plurality of mobile station devices (UE: User Equipment) MS: Mobile Station, MT: Mobile Terminal, also referred to as a terminal, a terminal device, and a mobile terminal) 5A, 5B, and 5C communicate with each other. Hereinafter, in the present embodiment, RRHs 4A, 4B, and 4C are referred to as RRH4, and the mobile station devices 5A, 5B, and 5C are referred to as mobile station devices 5 and will be described as appropriate. In the communication system 1, the base station device 3 and the RRH 4 cooperate to communicate with the mobile station device 5. In FIG. 9, the base station apparatus 3 and the RRH 4A perform cooperative communication with the mobile station apparatus 5A, the base station apparatus 3 and the RRH 4B perform cooperative communication with the mobile station apparatus 5B, and the base station apparatus 3 and the RRH 4C are mobile stations. Performs cooperative communication with the device 5C.

  Note that 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 and scheduling is determined by other base station apparatuses. Therefore, in the following description, it should be noted that the expression “base station apparatus 3” appropriately includes RRH4.

<Collaborative communication>
In the communication system 1 according to the embodiment of the present invention, cooperative communication (Cooperative Multipoint: CoMP communication) in which signals are transmitted and received in cooperation using a plurality of cells may be used. For example, a mode in which the base station apparatus communicates using any one frequency band is referred to as a “cell”. For example, as cooperative communication, different weighting signal processing (precoding processing) is applied to a signal in a plurality of cells (base station device 3 and RRH4), and base station device 3 and RRH4 cooperate with the signal to transmit the same mobile station. It transmits to the apparatus 5 (Joint Processing, Joint Transmission). For example, as coordinated communication, scheduling is performed for the mobile station apparatus 5 in cooperation with a plurality of cells (base station apparatus 3 and RRH 4) (Coordinated Scheduling: CS). For example, as cooperative communication, a signal is transmitted to the mobile station apparatus 5 by applying beamforming in cooperation with a plurality of cells (base station apparatus 3 and RRH 4) (Coordinated Beamforming: CB). For example, as cooperative communication, a signal is transmitted using a predetermined resource only in one cell (base station apparatus 3 or RRH4), and a signal is transmitted using a predetermined resource in one cell (base station apparatus 3 or RRH4). Do not send (Blanking, Muting). For example, as cooperative communication, a cell used for transmission is selected for each subframe among a plurality of cells (base station apparatus 3 and RRH 4), and a signal is transmitted to the mobile station apparatus 5 (Dynamic Point Switching: DPS). ).

  Although not described in the embodiment of the present invention, different cells may be configured by different base station devices 3 with respect to a plurality of cells used for cooperative communication, or different cells may be managed by the same base station device 3. The different RRH4 may be configured, and the different cell may be configured by the base station apparatus 3 and the RRH4 managed by the base station apparatus 3 different from the base station apparatus.

  The plurality of cells are physically used as different cells, but may be logically used as the same cell. Specifically, a configuration in which a common cell identifier (Physical cell ID) is used for each cell may be used. For example, a common physical cell ID is used in physically different cells, but a different virtual cell ID (Virtual cell ID) is used in each cell. For example, such a cell is referred to as a Virtual Cell. A configuration in which a plurality of transmitting apparatuses (base station apparatus 3 and RRH 4) transmit a common signal to the same receiving apparatus using the same frequency band is referred to as a single frequency network (Single Frequency Network: SFN).

  The deployment of the communication system 1 according to the embodiment of the present invention assumes a heterogeneous network deployment. The communication system 1 includes a base station device 3 and an RRH 4, and the coverage supported by the base station device 3 includes a part or all of the coverage supported by the RRH 4. Here, the coverage means an area where communication can be realized while satisfying the request. In the communication system 1, the base station device 3 and the RRH 4 transmit signals in cooperation to the mobile station device 5 located in the overlapping coverage. Here, the RRH 4 is managed by the base station apparatus 3 and transmission / reception is controlled. Note that the base station device 3 and the RRH 4 are connected by a wired line such as an optical fiber or a wireless line using a relay technology.

  When the mobile station apparatus 5 is located in the vicinity of the base station apparatus 3 or RRH4, the mobile station apparatus 5 may use single cell communication with the base station apparatus 3 or RRH4. That is, a certain mobile station apparatus 5 may communicate with the base station apparatus 3 or the RRH 4 without using cooperative communication to transmit and receive signals. For example, the base station apparatus 3 may receive an uplink signal from the mobile station apparatus 5 that is close in distance to itself. For example, the RRH 4 may receive an uplink signal from the mobile station apparatus 5 that is close in distance to the own apparatus. Further, for example, both the base station device 3 and the RRH 4 may receive uplink signals from the mobile station device 5 located near the edge of the coverage (cell edge) constructed by the RRH 4.

  Also, the mobile station apparatus 5 receives signals transmitted from both the base station apparatus 3 and the RRH 4 using cooperative communication in the downlink, and either the base station apparatus 3 or the RRH 4 in the uplink. Alternatively, the signal may be transmitted in a suitable form. For example, the mobile station apparatus 5 transmits an uplink signal with transmission power suitable for receiving a signal by the base station apparatus 3. For example, the mobile station apparatus 5 transmits an uplink signal with transmission power suitable for receiving a signal by the RRH 4.

  A plurality of RRHs 4 may simultaneously transmit different signals using the same physical resource in the downlink. For example, RRH4A, RRH4B, and RRH4C transmit reference signals using different scrambling sequences in the downlink. Thus, the form which communicates with several mobile station apparatuses spatially separated using the same physical resource is called Cell-splitting. A plurality of RRHs 4 form a communication area within the coverage area of one base station apparatus 3, and a virtual cell is configured by each RRH 4. In such cell deployment, the mobile station device 5 does not explicitly recognize the presence of the virtual cell, and therefore, the handover procedure is not executed even when the mobile station device 5 moves to a different virtual cell.

  The base station device 3 and the RRH 4 may simultaneously transmit different signals using the same physical resource in the downlink. For example, the base station apparatus 3 and the RRH 4 transmit reference signals using different scrambling sequences on the downlink. The base station apparatus 3 and the RRH 4 execute different precoding processes on the signals to be transmitted, and control the beam with respect to the signals for the mobile station apparatuses 5 in the respective areas, so that they are the same in the frequency domain and the time domain. Even when resources are used, relatively high orthogonality is realized with respect to signals between the mobile station apparatuses 5, and co-channel interference is reduced. Such a technique is called MU (Multi-User) -MIMO. Since signals between the mobile station devices 5 are spatially demultiplexed, it is also called SDMA (Space Division Multiple Access). MU-MIMO using reference signals using different scrambling sequences is called MU-MIMO with quasi-orthogonal RS.

  In FIG. 9, the area near RRH 4A is area A, the area near RRH 4B is area B, and the area near RRH 4C is area C. Within the area of the base station device 3, a second PDCCH, which will be described later, is used for each of the mobile station device 5 located in the area A, the mobile station device 5 located in the area B, and the mobile station device 5 located in the area C. And UE-specific RS may be subjected to different precoding processes. With respect to the area where the second PDCCH may be arranged, the area for mobile station apparatus 5 located in area A, mobile station apparatus 5 located in area B, and mobile station apparatus 5 located in area C Are set independently, and the precoding process can be applied independently.

  In the communication system 1, a downlink (also referred to as DL: Downlink) which is a communication direction from the base station apparatus 3 or the RRH 4 to the mobile station apparatus 5 is a downlink pilot channel, a physical downlink control channel (PDCCH: Physical). And a physical downlink shared channel (also referred to as PDSCH: Physical Downlink Shared CHannel). As for PDSCH, cooperative communication is applied or not applied. The PDCCH includes a first PDCCH and a second PDCCH (enhanced physical downlink control channel) (ePDCCH: enhanced PDCCH). The downlink pilot channel includes a first type reference signal (CRS described later) used for demodulation of the PDSCH and the first PDCCH, and a second type reference signal used for demodulation of the PDSCH and the second PDCCH ( It is comprised by UE-specific RS mentioned later and the 3rd type reference signal (CSI-RS mentioned later).

  From a viewpoint, the first PDCCH is a physical channel in which the same transmission port (antenna port, transmission antenna) as that of the first type reference signal is used. The second PDCCH is a physical channel in which the same transmission port as that of the second type reference signal is used. The mobile station apparatus 5 demodulates the signal mapped to the first PDCCH using the first type reference signal, and the second type of signal to the second PDCCH. Demodulate using reference signal. The first type of reference signal is a reference signal that is common to all mobile station apparatuses 5 in the cell, and is inserted in almost all resource blocks. is there. Therefore, any mobile station apparatus 5 can demodulate the first PDCCH. On the other hand, the second type of reference signal is a reference signal that can be basically inserted only into the allocated resource block. A precoding process can be adaptively applied to the second type of reference signal in the same manner as data.

  From one viewpoint, the first PDCCH is a control channel arranged in an OFDM symbol in which no PDSCH is arranged. The second PDCCH is a control channel arranged in an OFDM symbol in which PDSCH is arranged. From one point of view, the first PDCCH is basically a control channel in which signals are arranged over all PRBs in the downlink system band (PRB of the first slot). The PDCCH is a control channel in which signals are arranged over the PRB pair (PRB) configured by the base station apparatus 3 in the downlink system band. Although details will be described later, when viewed from one viewpoint, different signal configurations are used for the first PDCCH and the second PDCCH. The first PDCCH uses a CCE structure described later for signal configuration, and the second PDCCH uses an eCCE (enhanced CCE) (second element) structure described later for signal configuration. In other words, the minimum unit (element) of resources used for the configuration of one control channel differs between the first PDCCH and the second PDCCH, and each control channel includes one or more minimum units. The

  Further, in the communication system 1, an uplink (also referred to as UL: Uplink) that is a communication direction from the mobile station device 5 to the base station device 3 or the RRH 4 is also referred to as a physical uplink shared channel (PUSCH: Physical Uplink Shared CHannel). ), Uplink pilot channel (uplink reference signal; UL RS: Uplink Reference Signal, SRS: Sounding Reference Signal, DM RS: Demodulation Reference Signal), and physical uplink control channel (PUCCH: Physical Uplink Control CHannel) To be included). 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.

  In addition, the present invention is applicable to a communication system in which, for example, cooperative communication is applied to the downlink, for example, multiple antenna transmission is applied to the downlink. A case where cooperative communication is not applied and a case where multi-antenna transmission is not applied in the uplink will be described, but the present invention is not limited to such a case.

  The PDSCH is a physical channel used for transmission / reception of downlink data and control information (different from control information transmitted on the PDCCH). The PDCCH is a physical channel used for transmission / reception of downlink control information (different from control information transmitted on the PDSCH). 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. Other physical channel types include synchronization channel (Synchronization CHannel: SCH) used to establish downlink synchronization and physical random access channel (Physical Random Access CHannel: PRACH) used to establish uplink synchronization. In addition, a physical broadcast channel (PBCH) used for transmission of downlink system information (also referred to as SIB: System Information Block) is used. The PDSCH is also used for transmission of downlink system information.

  The mobile station device 5, the base station device 3, or the RRH 4 arranges and transmits signals generated from control information, data, etc. in each physical channel. The mobile station device 5, the base station device 3, or the RRH 4 receives each physical channel transmitted with signals generated from control information, data, and the like. Data transmitted on the PDSCH or PUSCH is referred to as a transport block. In addition, an area controlled by the base station apparatus 3 or the RRH 4 is called a cell.

<Configuration of downlink time frame>
FIG. 10 is a diagram illustrating a schematic configuration of a downlink time frame from the base station apparatus 3 or the RRH 4 to the mobile station apparatus 5 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. 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 or the RRH 4. 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). Each downlink subframe includes at least a PDSCH used for transmitting information data (also referred to as a transport block), a first PDCCH used for transmitting control information for the PDSCH, and a second PDCCH. Is done. In this figure, the first PDCCH is composed of the first to third OFDM symbols of the downlink subframe, and the PDSCH and the second PDCCH are composed of the fourth to fourteenth OFDM symbols of the downlink subframe. Composed. The PDSCH and the second PDCCH are arranged in different DL PRB pairs. In addition, the number of OFDM symbols constituting the first PDCCH and the number of OFDM symbols constituting the PDSCH and the second PDCCH may be changed for each downlink subframe. Note that the number of OFDM symbols constituting the second PDCCH may be fixed. For example, regardless of the number of OFDM symbols that make up the first PDCCH and the number of OFDM symbols that make up the PDSCH, the second PDCCH is made up of the 4th to 14th OFDM symbols in the downlink subframe. Also good.

  In FIG. 10, one or more first PDCCHs are arranged in the resource indicated as the first PDCCH. In FIG. 10, one or more second PDCCHs are arranged in the resources illustrated as the second PDCCH. In FIG. 10, one or more PDSCHs are arranged in the resources indicated as PDSCH.

  Although not shown in this figure, a downlink pilot channel used for transmission of a downlink reference signal (reference signal: RS) (referred to as a downlink reference signal) is distributed to a plurality of downlink resource elements. Be placed. Here, the downlink reference signal includes at least different types of first type reference signals, second type reference signals, and third type reference signals. For example, the downlink reference signal is used to estimate propagation path fluctuations of PDSCH and PDCCH (first PDCCH and second PDCCH). The first type of reference signal is used for demodulation of the PDSCH and the first PDCCH, and is also referred to as Cell specific RS: CRS. The second type of reference signal is used for demodulation of the PDSCH and the second PDCCH, and is also referred to as UE-specific RS. For example, the third type of reference signal is used only for estimating propagation path fluctuations, and is also referred to as Channel State Information RS: CSI-RS. The downlink reference signal is a known signal in the communication system 1. Note that the number of downlink resource elements constituting the downlink reference signal may depend on the number of transmission antennas (antenna ports) used for communication to the mobile station apparatus 5 in the base station apparatus 3 and RRH4. In the following description, a case will be described in which CRS is used as the first type reference signal, UE-specific RS is used as the second type reference signal, and CSI-RS is used as the third type reference signal. Note that the UE-specific RS can also be used for demodulation of PDSCH to which cooperative communication is applied and PDSCH to which cooperative communication is not applied. Note that the UE-specific RS can also be used for demodulation of the second PDCCH to which cooperative communication (precoding processing) is applied and the second PDCCH to which cooperative communication is not applied.

  PDCCH (first PDCCH or second PDCCH) is information indicating allocation of DL PRB pair to PDSCH, information indicating allocation of UL PRB pair to PUSCH, and a mobile station identifier (Radio Network Temporary Identifier: RNTI). )), A signal generated from control information such as a modulation scheme, a coding rate, a retransmission parameter, a spatial multiplexing number, a precoding matrix, and information indicating a transmission power control command (TPC command) is arranged. Control information included in the PDCCH is referred to as downlink control information (Downlink Control Information: DCI). DCI including information indicating assignment of DL PRB pair to PDSCH is referred to as downlink assignment (also referred to as DL assignment or Downlink grant), and DCI including information indicating assignment of UL PRB pair to PUSCH. Is called an uplink grant (uplink grant: UL grant). Note that the downlink assignment includes a transmission power control command for PUCCH. The uplink assignment includes a transmission power control command for PUSCH. In addition, one PDCCH 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, or a plurality of information It does not include information indicating PUSCH resource allocation.

  Further, as information transmitted on the PDCCH, there is a cyclic redundancy check CRC (Cyclic Redundancy Check) code. The relationship between DCI, RNTI, and CRC transmitted on the PDCCH 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 PDCCH. Is done.

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

  The arrangement of the downlink reference signal will be described. FIG. 11 is a diagram illustrating an example of an arrangement of downlink reference signals in a downlink subframe of the communication system 1 according to the embodiment of the present invention. For simplification of description, FIG. 11 illustrates the arrangement of downlink reference signals in a single DL PRB pair, but a common arrangement method is used in a plurality of DL PRB pairs in the downlink system band. .

  Among the shaded downlink resource elements, R0 to R1 indicate CRSs of the antenna ports 0 to 1, respectively. 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 ports used for CRS transmission, a plurality of physical antennas constituting the same antenna port transmit the same signal. For antenna ports used for CRS transmission, delay diversity or CDD (Cyclic Delay Diversity) can be applied using a plurality of physical antennas within the same antenna port, but other signal processing is also possible. Cannot be used. Here, FIG. 11 shows the case where the CRS corresponds to two antenna ports, but the communication system of the present embodiment may support different numbers of antenna ports, for example, one antenna port or four antenna ports. A CRS for an antenna port may be mapped to a downlink resource. The CRS may be arranged in all DL PRB pairs in the downlink system band.

  Among the shaded downlink resource elements, D1 indicates a downlink resource element in which the UE-specific RS is arranged. 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 transmission of the UE-specific RS, a plurality of physical antennas constituting the same antenna port transmit signals subjected to different signal processing (for example, different phase rotation processing). As for the antenna port used for transmitting the UE-specific RS, beam forming is realized using a plurality of physical antennas in the same antenna port. When UE-specific RS is transmitted using a plurality of antenna ports, different codes are used for each antenna port. For example, a Walsh code is used as the code. That is, CDM (Code Division Multiplexing) is applied to the UE-specific RS for each antenna port. Here, the UE-specific RS is mapped and the length of the code used for CDM according to the type of signal processing (number of antenna ports) used for the control signal and data signal mapped to the DL PRB pair. The number of downlink resource elements may be changed.

  FIG. 11 shows an example of arrangement of UE-specific RSs when the number of antenna ports used for UE-specific RS transmission is one (antenna port 7) or two (antenna port 7 and antenna port 8). Show. For example, in the base station apparatus 3 and the RRH 4, when the number of antenna ports used for transmission of UE-specific RS is two, a code having a code length of 2 is used and the same frequency region (subcarrier) is used. UE-specific RSs are multiplexed and arranged with two downlink resource elements in a continuous time domain (OFDM symbol) as one unit (unit of CDM). In other words, in this case, CDM is applied to multiplexing of UE-specific RS. In FIG. 11, the UE-specific RSs of the antenna port 7 and the antenna port 8 are multiplexed on D1 by CDM.

  FIG. 12 is a diagram illustrating an example of an arrangement of the downlink reference signals in the downlink subframe of the communication system 1 according to the embodiment of the present invention. Among the shaded downlink resource elements, D1 and D2 indicate UE-specific RSs. FIG. 12 shows that the number of antenna ports used for UE-specific RS transmission is three (antenna port 7, antenna port 8, and antenna port 9) or four (antenna port 7, antenna port 8, and antenna port 9). An example of UE-specific RS arrangement in the case of antenna port 10) is shown. For example, when the number of antenna ports used for transmission of UE-specific RS in base station apparatus 3 and RRH 4 is 4, the number of downlink resource elements to which UE-specific RS is mapped is changed to 2 times. The UE-specific RS is multiplexed and arranged on different downlink resource elements for each antenna port. In other words, in this case, CDM and FDM (Frequency Division Multiplexing) are applied to multiplexing of UE-specific RS. In FIG. 12, the UE-specific RS of the antenna port 7 and the antenna port 8 is multiplexed by CDM on D1, and the UE-specific RS of the antenna port 9 and the antenna port 10 is multiplexed on CD2 by CDM.

  For example, when the number of antenna ports used for transmission of UE-specific RS in base station apparatus 3 and RRH4 is 8, the number of downlink resource elements to which UE-specific RS is mapped is changed to twice, UE-specific RSs are multiplexed and arranged using four downlink resource elements as a unit, using a code whose length is 4. In other words, in this case, CDMs having different code lengths are applied to multiplexing of UE-specific RSs.

  Further, in UE-specific RS, a scramble code is further superimposed on the code of each antenna port. For example, this scramble code is generated based on the cell ID (physical cell ID) and the scramble ID notified from the base station apparatus 3 and the RRH 4. For example, the scramble code is generated from a pseudo random sequence generated based on the cell ID and the scramble ID notified from the base station apparatus 3 and the RRH 4. For example, the scramble ID is a value indicating 0 or 1. Moreover, the parameter notified separately for every mobile station apparatus 5 may be used for the production | generation of the scramble code used for UE-specific RS. For example, a virtual cell ID (Virtual cell ID) is notified from the base station device 3 for each mobile station device 5 as a parameter. UE-specific RS is arrange | positioned in DL PRB pair of PDSCH allocated to the mobile station apparatus 5 set to use UE-specific RS, and 2nd PDCCH. Different scrambling methods are used for the UE-specific RS arranged in the DL PRB pair assigned to the PDSCH and the UE-specific RS arranged in the DL PRB pair assigned to the second PDCCH. Also good. For example, for the UE-specific RS arranged in the DL PRB pair allocated to the PDSCH, two virtual cell IDs are configured from the base station device 3 to the mobile station device 5, and the downlink control information This indicates whether the virtual cell ID is used. For example, for the UE-specific RS arranged in the DL PRB pair assigned to the second PDCCH, one virtual cell ID is configured from the base station device 3 to the mobile station device 5, and a fixed value scrambling is performed. A ring ID, for example 0, is used.

  Further, each of the base station apparatus 3 and the RRH 4 may allocate a CRS signal to different downlink resource elements, or may allocate a CRS signal to the same downlink resource element. For example, when the cell IDs notified from the base station apparatus 3 and the RRH 4 are different, CRS signals may be assigned to different downlink resource elements. In another example, only the base station apparatus 3 allocates CRS signals to some downlink resource elements, and the RRH 4 may not allocate CRS signals to any downlink resource elements. For example, when the cell ID is reported only from the base station apparatus 3, only the base station apparatus 3 allocates CRS signals to some downlink resource elements as described above, and the RRH 4 is any downlink resource. It is not necessary to assign a CRS signal to an element. In another example, the base station apparatus 3 and the RRH 4 may allocate a CRS signal to the same downlink resource element, and transmit the same sequence from the base station apparatus 3 and the RRH 4. For example, when the cell IDs notified from the base station apparatus 3 and the RRH 4 are the same, a CRS signal may be allocated as described above.

  FIG. 13 is a diagram illustrating a DL PRB pair to which CSI-RS (transmission path condition measurement reference signal) for 8 antenna ports is mapped. FIG. 13 shows a case where CSI-RS is mapped when the number of antenna ports (number of CSI ports) used in base station apparatus 3 and RRH 4 is 8. In FIG. 13, descriptions of CRS, UE-specific RS, PDCCH, PDSCH, and the like are omitted for simplification of description.

  CSI-RS uses a 2-chip orthogonal code (Walsh code) in each CDM group, and a CSI port (CSI-RS port (antenna port, resource grid)) is assigned to each orthogonal code. Code division multiplexing is performed for each port. Further, each CDM group is frequency division multiplexed. CSI-RSs of 8 antenna ports of CSI ports 1 to 8 (antenna ports 15 to 22) are mapped using four CDM groups. For example, in CSI-RS CDM group C1, CSI-RSs of CSI ports 1 and 2 (antenna ports 15 and 16) are code-division multiplexed and mapped. In CDM group C2 of CSI-RS, CSI-RS of CSI ports 3 and 4 (antenna ports 17 and 18) are code division multiplexed and mapped. In CDM group C3 of CSI-RS, CSI-RS of CSI ports 5 and 6 (antenna ports 19 and 20) are code division multiplexed and mapped. In the CDM group C4 of CSI-RS, CSI-RSs of CSI ports 7 and 8 (antenna ports 21 and 22) are code division multiplexed and mapped.

  When the number of CSI-RS antenna ports of the base station device 3 and the RRH 4 is 8, the base station device 3 and the RRH 4 can set the number of layers (number of ranks, spatial multiplexing number) applied to the PDSCH to a maximum of 8. Moreover, the base station apparatus 3 and RRH4 can transmit CSI-RS in case the number of the antenna ports of CSI-RS is 1, 2 or 4. The base station apparatus 3 and the RRH 4 can transmit CSI-RS for one antenna port or two antenna ports by using the CDM group C1 of CSI-RS shown in FIG. The base station apparatus 3 and the RRH 4 can transmit CSI-RS for four antenna ports using the CDM groups C1 and C2 of CSI-RS shown in FIG.

  Further, the base station apparatus 3 and the RRH 4 may each allocate a CSI-RS signal to different downlink resource elements, or may allocate a CSI-RS signal to the same downlink resource element. For example, the base station device 3 and the RRH 4 may respectively assign different downlink resource elements and / or different signal sequences to the CSI-RS. In the mobile station apparatus 5, CSI-RS transmitted from the base station apparatus 3 and CSI-RS transmitted from the RRH 4 are recognized as CSI-RS corresponding to different antenna ports. The configuration of CSI-RS (number of antenna ports, resource position, transmitted subframe) transmitted from base station apparatus 3 and the configuration of CSI-RS transmitted from RRH 4 are independently set in mobile station apparatus 5. . Moreover, the structure of CSI-RS transmitted from a plurality of RRHs 4 can be set in the mobile station apparatus 5 independently.

  The configuration of CSI-RS (CSI-RS-Config-r10) is notified from the base station device 3 and the RRH 4 to the mobile station device 5. For example, as the configuration of CSI-RS, information indicating the number of antenna ports set in CSI-RS (antennaPortsCount-r10), information indicating a downlink subframe in which CSI-RS is arranged (subframeConfig-r10), Information (ResourceConfig-r10) indicating a frequency region where the CSI-RS is arranged is included. As the number of CSI-RS antenna ports, for example, any one of 1, 2, 4, and 8 is used. As information indicating the frequency region where the CSI-RS is allocated, an index indicating the position of the first resource element is used among the resource elements where the CSI-RS corresponding to the antenna port 15 (CSI port 1) is allocated. . If the position of the CSI-RS corresponding to the antenna port 15 is determined, the CSI-RS corresponding to the other antenna port is uniquely determined based on a predetermined rule. As information indicating the downlink subframe in which the CSI-RS is arranged, the position and period of the downlink subframe in which the CSI-RS is arranged are indicated by an index. For example, if the index of subframeConfig-r10 is 5, it indicates that CSI-RS is arranged for every 10 subframes, and subframe 0 (subframe in a radio frame is included in a radio frame having 10 subframes as a unit. Indicates that the CSI-RS is arranged. Further, in another example, for example, if the index of subframeConfig-r10 is 1, it indicates that CSI-RS is arranged every 5 subframes. 6 shows that CSI-RS is arranged.

<Configuration of uplink time frame>
FIG. 14 is a diagram illustrating a schematic configuration of an uplink time frame from the mobile station apparatus 5 to the base station apparatus 3 and the RRH 4 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 and the RRH 4. 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).

  Each uplink subframe includes at least PUSCH used for transmission of information data, PUCCH used for transmission of uplink control information (UCI), and demodulation of PUSCH and PUCCH (estimation of propagation path fluctuation). UL RS (DM RS) is arranged. Although not shown, a PRACH used for establishing uplink synchronization is arranged in any uplink subframe. Although not shown, UL RS (SRS) used for measuring 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).

  In addition, when the mobile station apparatus 5 indicates to the base station apparatus 3 that an uplink resource allocation is requested, the mobile station apparatus 5 transmits a signal using the PUCCH for SR transmission. The base station apparatus 3 recognizes that the mobile station 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 mobile station apparatus 5 indicates to the base station apparatus 3 that it does not request allocation of uplink resources, the mobile station apparatus 5 does not transmit any signal using the PUCCH resources for transmission of the SR allocated in advance. The base station apparatus 3 recognizes that the mobile station apparatus 5 does not request uplink resource allocation from the result that the signal is not detected by the PUCCH resource for transmission of the SR.

  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 reference signal (DM RS) of the uplink pilot channel 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. 14, 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. In addition, when the mobile station apparatus 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 allocated. To send a signal. In addition, when the mobile station apparatus 5 is set to perform simultaneous transmission of PUSCH and PUCCH, when PUCCH resources and PUSCH resources are allocated in the same uplink subframe, the PUCCH resources are basically allocated. And PUSCH resources can be used for signal transmission.

  UL RS is a signal used for an uplink pilot channel. UL RS is a demodulation reference signal (DM RS) used for estimating propagation path fluctuations of PUSCH and PUCCH, and channel quality measurement for frequency scheduling and adaptive modulation of PUSCH of base station apparatus 3 and RRH4. , The base station apparatus 3, and the sounding reference signal (SRS) used for measuring the synchronization deviation between the RRH 4 and the mobile station apparatus 5. For simplification of description, SRS is not shown in FIG. 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 device 3 assigns a UL PRB to be assigned to the SRS, a period for transmitting the SRS for each mobile station device 5.

  FIG. 14 shows the case where the PUCCH is arranged at the end UL PRB in the frequency region of the uplink system band, but the second and third UL PRBs from the end of the uplink system band are 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.

  FIG. 15 is a diagram showing a configuration and numbers of PUCCH resources for ACK / NACK in the communication system according to the embodiment of the present invention. Here, an example of PUCCH resources in which PUCCH format 1a or PUCCH format 1b is used is shown. FIG. 15 shows a case where 24 ACK / NACK PUCCH resources are configured in each uplink subframe. Further, in FIG. 15, two UL PRB pairs (UL PRB pair 5 and UL PRB pair 6) and four frequency domain code sequences (frequency domain code) (frequency domain) are used for PUCCH resources for ACK / NACK. Code 1, frequency domain Code 2, frequency domain Code 3, frequency domain Code 4), three time domain code sequences (time domain Code) (time domain Code 1, time domain Code 2, A case where Code 3) in the time domain is used will be described. Note that a different number of UL PRB pairs, frequency domain code sequences, and time domain code sequences than the number shown in FIG. 15 may be used, and a different number of PUCCH resources than the number shown in FIG. May be. Each PUCCH resource shown in FIG. 15 is composed of different combinations of UL PRB pairs, frequency domain code sequences, and time domain code sequences, and is in the frequency domain, the code domain in the frequency domain, or the code domain in the time domain. In an orthogonal relationship. Different numbering (PUCCH resource index) is assigned to PUCCH resources configured by different combinations of UL PRB pair, frequency domain code sequence, and time domain code sequence.

  In FIG. 15, for simplicity of explanation, frequency hopping between slots applied to PUCCH is not described. For example, FIG. 15 shows the resource configuration of the first uplink slot of the uplink subframe, and the second uplink slot of the uplink subframe is targeted for the frequency domain within the uplink system band. A resource of a certain UL PRB is configured. For example, in an uplink system band composed of 110 UL PRB pairs, PUCCH1 is UL PRB of UL PRB pair 105 in the second uplink slot of the uplink subframe, Code 1 in the frequency domain, and in the time domain It is composed of Code 1. Also, a sequence for a frequency domain code sequence configured by a first uplink slot of an uplink subframe and a frequency domain code sequence configured by a second uplink slot of an uplink subframe Hopping may be applied. Also, a sequence for a time domain code sequence configured by the first uplink slot of the uplink subframe and a time domain code sequence configured by the second uplink slot of the uplink subframe Hopping may be applied.

  The PUSCH resource is an uplink subframe after a predetermined number (for example, 4) from the downlink subframe in which the PDCCH resource including the uplink grant used to allocate the PUSCH resource is allocated 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 PDCCH resource including the downlink assignment used for the allocation of the PDSCH resource is arranged.

<Configuration of first PDCCH>
The first PDCCH is configured by a plurality of control channel elements (CCE). The number of CCEs used in each downlink system band includes the downlink system bandwidth, the number of OFDM symbols constituting the first PDCCH, and the transmission antenna of the base station apparatus 3 (or RRH4) used for communication. It depends on the number of downlink reference signals of the downlink pilot channel (CRS) according to the number. As will be described later, the CCE is composed of a plurality of downlink resource elements.

  FIG. 16 is a diagram illustrating a logical relationship between the first PDCCH and the CCE of the communication system 1 according to the embodiment of the present invention. The CCE used between the base station apparatus 3 (or RRH 4) and the mobile station apparatus 5 is assigned a number for identifying the CCE. The CCE numbering is performed based on a predetermined rule. Here, CCE t indicates the CCE of CCE number t. The first PDCCH is configured by an aggregation (CCE Aggregation) composed of a plurality of CCEs. The number of CCEs constituting this set is hereinafter referred to as “CCE aggregation number” (CCE aggregation level). The CCE aggregation number constituting the first PDCCH is set in the base station apparatus 3 according to the coding rate set in the first PDCCH and the number of DCI bits included in the first PDCCH. In addition, a set of n CCEs is hereinafter referred to as “CCE aggregation n”.

  For example, the base station apparatus 3 configures the first PDCCH with one CCE (CCE aggregation 1), configures the first PDCCH with two CCEs (CCE aggregation 2), and four CCEs. To configure the first PDCCH (CCE aggregation 4), or configure the first PDCCH by eight CCEs (CCE aggregation 8). For example, the base station apparatus 3 uses a CCE aggregation number with a small number of CCEs constituting the first PDCCH for the mobile station apparatus 3 with good channel quality, and the mobile station apparatus 3 with poor channel quality uses the CCE aggregation number. A CCE aggregation number having a large number of CCEs constituting one PDCCH is used. In addition, for example, when the base station device 3 transmits DCI with a small number of bits, the CCE aggregation number with a small number of CCEs constituting the first PDCCH is used, and when the DCI with a large number of bits is transmitted, A CCE aggregation number having a large number of CCEs constituting the PDCCH is used.

  In FIG. 16, what is indicated by diagonal lines means the first PDCCH candidate. The first PDCCH candidate (PDCCH candidate) is a target on which the mobile station apparatus 5 performs decoding detection of the first PDCCH, and the first PDCCH candidate is configured independently for each CCE aggregation number. The first PDCCH candidate configured for each CCE aggregation number includes one or more different CCEs. For each CCE aggregation number, the number of first PDCCH candidates is set independently. The first PDCCH candidate configured for each CCE aggregation number includes CCEs having consecutive numbers. The mobile station apparatus 5 performs the first PDCCH decoding detection for the number of first PDCCH candidates set for each CCE aggregation number. In addition, when the mobile station apparatus 5 determines that the first PDCCH addressed to the mobile station apparatus 5 has been detected, the mobile station apparatus 5 does not have to perform the first PDCCH decoding detection for a part of the set first PDCCH candidates. Good (may stop)

  The plurality of downlink resource elements constituting the CCE are configured by a plurality of resource element groups (also referred to as REG and mini-CCE). The resource element group is composed of a plurality of downlink resource elements. For example, one resource element group is composed of four downlink resource elements. FIG. 17 is a diagram illustrating an arrangement example of resource element groups in a downlink subframe of the communication system 1 according to the embodiment of the present invention. Here, the resource element group used for the first PDCCH is shown, and illustrations and descriptions of unrelated parts (PDSCH, second PDCCH, UE-specific RS, CSI-RS) are omitted. Here, the first PDCCH is composed of first to third OFDM symbols, and downlink reference signals (R0, R1) corresponding to CRSs of two transmission antennas (antenna port 0, antenna port 1) are provided. It shows about the case where it arranges. In this figure, the vertical axis represents the frequency domain, and the horizontal axis represents the time domain.

  In the arrangement example of FIG. 17, one resource element group is configured by four downlink resource elements adjacent in the frequency domain. In FIG. 17, the downlink resource elements to which the same reference numerals of the first PDCCH are assigned belong to the same resource element group. Note that resource element R0 (downlink reference signal for antenna port 0) and R1 (downlink reference signal for antenna port 1) in which downlink reference signals are arranged are skipped to form a resource element group. In FIG. 17, numbering (symbol “1”) is performed from the resource element group of the first OFDM symbol having the lowest frequency, and then the resource element group of the second OFDM symbol having the lowest frequency is numbered. (Symbol “2”) is performed, and the frequency is next lowest, indicating that the resource element group of the third OFDM symbol is numbered (symbol “3”). In FIG. 17, the resource element group adjacent to the frequency of the resource element group on which the numbering (symbol “2”) of the second OFDM symbol in which the downlink reference signal is not arranged next is performed is numbered (symbol “symbol“ 4 ”), and the resource element group adjacent to the frequency of the resource element group on which the third OFDM symbol in which the downlink reference signal is not allocated is numbered (symbol“ 3 ”) is numbered (symbol “5”) is performed. Further, in FIG. 17, the resource element group adjacent to the frequency of the resource element group on which the first OFDM symbol is numbered (symbol “1”) is numbered (symbol “6”). Next, the resource element group adjacent to the frequency of the resource element group on which the second OFDM symbol is numbered (symbol “4”) is numbered (symbol “7”), and then the third OFDM symbol is numbered. This indicates that numbering (symbol “8”) is performed on the resource element group adjacent to the frequency of the resource element group on which symbol numbering (symbol “5”) is performed. The same numbering is performed for the subsequent resource element groups.

  The CCE is composed of a plurality of resource element groups shown in FIG. For example, one CCE is composed of nine different resource element groups distributed in the frequency domain and the time domain. Specifically, in the CCE used for the first PDCCH, resource elements using block interleavers are assigned to all resource element groups numbered as shown in FIG. 17 for the entire downlink system band. Interleaving is performed in units of groups, and one CCE is composed of nine resource element groups having consecutive numbers after interleaving.

<Configuration of second PDCCH>
The mobile station apparatus 5 is configured (set) in an area in which the second PDCCH may be arranged (hereinafter referred to as a second PDCCH area for simplification of description) (ePDCCH region). . A unit of mapping of resources constituting one second PDCCH is a set of a predetermined number of DL PRB pairs, and is one second PDCCH region. One or more second PDCCH regions may be configured for the mobile station apparatus 5. For example, in a plurality of mobile station apparatuses 5 in which a plurality of second PDCCH regions are configured, a part of the second PDCCH regions are configured by a plurality of DL PRB pairs in common, and a part of different second PDCCH regions Can be composed of a plurality of DL PRB pairs. The mobile station apparatus 5 performs a decoding process for detecting the second PDCCH in each of the plurality of configured second PDCCH regions. The second PDCCH region may be referred to as an enhanced physical downlink control channel set (ePDCCH set).

  FIG. 18 is a diagram illustrating an example of a schematic configuration of the second PDCCH region in the communication system 1 according to the embodiment of the present invention. The base station device 3 configures (sets and arranges) a plurality of second PDCCH regions (second PDCCH region 1, second PDCCH region 2, and second PDCCH region 3) in the downlink system band. Can do. One second PDCCH region is composed of a plurality of DL PRB pairs. For example, one second PDCCH region is composed of four DL PRB pairs. For example, a plurality of DL PRB pairs constituting one second PDCCH region may be configured by DL PRB pairs dispersed in the frequency domain as shown in FIG. 18, or DL PRB pairs that are continuous in the frequency domain. It may be constituted by. For example, the base station device 3 can configure the second PDCCH region for each of the plurality of mobile station devices 5. In FIG. 18, each of the second PDCCH region 1, the second PDCCH region 2, and the second PDCCH region 3 is composed of different DL PRB pairs.

  Different transmission methods may be set for the arranged signals for each of the second PDCCH regions configured in the mobile station apparatus 5. For example, a beam forming process suitable for the mobile station apparatus 5 is applied to a certain second PDCCH region configured in the mobile station apparatus 5. For example, a random beamforming process is applied to a certain second PDCCH region configured in the mobile station apparatus 5. Here, the beam forming process suitable for the mobile station apparatus 5 is optimal based on channel state information (precoding matrix indicator: PMI) notified from the mobile station apparatus 5 to the base station apparatus 3. This means that precoding processing is performed. Here, the random beamforming process is a precoding process selected at random for each DL PRB pair resource constituting one second PDCCH (an example of a precoding row is selected at random). In other words, the process of multiplying the signal is performed. For example, the beam forming process suitable for the mobile station apparatus 5 is the mobile station apparatus 5 that moves at low speed, and is applied to the mobile station apparatus 5 in which channel state information is appropriately fed back to the base station apparatus 3. For example, the random beam forming process is applied to the mobile station apparatus 5 that moves at high speed and the mobile station apparatus 5 in which the channel state information is not properly fed back to the base station apparatus 3. In the second PDCCH in which the beam forming process suitable for the mobile station apparatus 5 is executed, the same precoding process is executed for all signals transmitted on the second PDCCH. In the second PDCCH in which random beamforming processing is performed, the same precoding processing is not performed on all signals transmitted on the second PDCCH, but different precoding processing is performed on different signals. The For example, in the second PDCCH in which random beamforming processing is executed, different precoding processing is executed for signals arranged in different DL PRB pairs. Preferably, in the second PDCCH in which random beamforming processing is performed, precoding matrices that are orthogonal to each other are used for signals arranged in different DL PRB pairs.

  In the DL PRB pair, the same precoding process is applied to the second PDCCH signal transmitted to the same mobile station apparatus 5 and the UE-specific RS. In the DL PRB pair in which the second PDCCH signal on which beamforming processing suitable for the mobile station apparatus 5 is performed is arranged, different precoding is performed for different second PDCCH signals for different mobile station apparatuses 5. Processing may be performed. In the DL PRB pair in which the second PDCCH signal on which random beamforming processing is performed is arranged, the same precoding processing may be performed on different second PDCCH signals for different mobile station apparatuses 5. .

  One second PDCCH is composed of one or more eCCEs (second elements). FIG. 19 is a diagram illustrating a logical relationship between the second PDCCH and the eCCE of the communication system 1 according to the embodiment of the present invention. The eCCE used between the base station device 3 (or RRH 4) and the mobile station device 5 is assigned a number for identifying the E-CCE. The numbering of eCCE is performed based on a predetermined rule. Here, eCCE t indicates the eCCE of the eCCE number t. The second PDCCH is configured by an aggregation (eCCE Aggregation) composed of a plurality of eCCEs. The number of eCCEs constituting this aggregation is hereinafter referred to as “eCCE aggregation number” (eCCE aggregation level). For example, the eCCE aggregation number configuring the second PDCCH is set in the base station apparatus 3 according to the coding rate set in the second PDCCH and the number of bits of DCI included in the second PDCCH. Further, a set of n eCCEs is hereinafter referred to as “eCCE aggregation n”.

  For example, the base station apparatus 3 configures a second PDCCH with one eCCE (eCCE aggregation 1), configures a second PDCCH with two eCCEs (eCCE aggregation 2), and four eCCEs. The second PDCCH is configured by (eCCE aggregation 4), or the second PDCCH is configured by eight eCCEs (eCCE aggregation 8). For example, the base station apparatus 3 uses an eCCE aggregation number with a small number of eCCEs constituting the second PDCCH for the mobile station apparatus 3 with good channel quality, and the mobile station apparatus 3 with poor channel quality uses the first eCCE aggregation number. An eCCE aggregation number having a large number of eCCEs constituting the second PDCCH is used. In addition, for example, when the base station apparatus 3 transmits DCI with a small number of bits, an eCCE aggregation number with a small number of eCCEs constituting the second PDCCH is used, and when the DCI with a large number of bits is transmitted, An eCCE aggregation number having a large number of eCCEs constituting the PDCCH is used.

  In FIG. 19, what is indicated by diagonal lines means a second PDCCH candidate. The second PDCCH candidate (ePDCCH candidate) is a target on which the mobile station apparatus 5 performs decoding detection of the second PDCCH, and the second PDCCH candidate is configured independently for each eCCE aggregation number. The second PDCCH candidate configured for each eCCE aggregation number includes one or more different eCCEs. For each eCCE aggregation number, the number of second PDCCH candidates is set independently. The second PDCCH candidate configured for each eCCE aggregation number includes eCCEs having consecutive numbers. The mobile station apparatus 5 performs second PDCCH decoding detection on the number of second PDCCH candidates set for each eCCE aggregation number. In addition, when the mobile station apparatus 5 determines that the second PDCCH addressed to the mobile station apparatus 5 has been detected, the mobile station apparatus 5 does not have to perform the second PDCCH decoding detection for a part of the set second PDCCH candidates. Good (may stop)

  The number of eCCEs configured by one second PDCCH region depends on the number of DL PRB pairs that configure the second PDCCH region. For example, the amount of resources (number of resource elements) supported by one eCCE is a resource (downlink) that cannot be used for a second PDCCH signal from a resource obtained by dividing one DL PRB pair resource into four. The amount of resources excluding the reference signal and resource elements used for the first PDCCH) is almost equal. For example, 16 eCCEs are configured in the second PDCCH region including four DL PRB pairs. In the embodiment of the present invention, for simplification of description, one second PDCCH region is composed of four DL PRB pairs, and one second PDCCH region is composed of 16 eCCEs. Although the case will be mainly described, the present invention is not limited to such a case. For example, one second PDCCH region may be configured from a number of DL PRB pairs different from four. For example, the amount of resources (number of resource elements) supported by one eCCE is a resource (downlink) that cannot be used for a second PDCCH signal from a resource obtained by dividing one DL PRB pair resource into four. It may be composed of a different amount of resources excluding the reference signal (resource element used for the first PDCCH), and may be composed of a resource obtained by dividing one DL PRB pair resource into two. The amount of resources excluding resources (downlink reference signals, resource elements used for the first PDCCH) that cannot be used for other PDCCH signals may be approximately the same.

  Two types of methods are used as a mapping method of the resources constituting the second PDCCH. For convenience of explanation, they are referred to as Localized mapping (first mapping method) and Distributed mapping (second mapping method). The transmission of the second PDCCH using a resource configured by Localized mapping is referred to as Localized transmission. The transmission of the second PDCCH using a resource configured by distributed mapping is referred to as “Distributed transmission”. For example, the beam forming process suitable for the mobile station apparatus 5 described above is applied to the localized transmission. For example, the above-described random beam forming process is applied to the distributed transmission. Localized mapping is a method in which one eCCE is mapped to a resource in one DL PRB pair. Distributed mapping is a method in which one eCCE is mapped to a plurality of DL PRB pair resources. For example, in distributed mapping, one eCCE is mapped to some resources of each DL PRB pair of the four DL PRB pairs in the second PDCCH region. In other words, in localized mapping, one eCCE is composed of physical resources in one DL PRB pair. In distributed mapping, one eCCE is composed of resources obtained by collecting a part of resources in each DL PRB pair of a plurality of DL PRB pairs.

  FIG. 20 is a diagram illustrating an example of localized mapping according to the embodiment of this invention. Here, one second PDCCH region is composed of four DL PRB pairs (DL PRB pair W, DL PRB pair X, DL PRB pair Y, DL PRB pair Z), and in one DL PRB pair. 16 eREGs (enhanced Resource Element Group) (eREG1, eREG2, eREG3, eREG4, eREG5, eREG6, eREG7, eREG8, eREG9, eREG10, eREG11, eREG12, eREG13, eREG13, eREG13, eREG13, eREG13, eREG13, eREG13, eREG13, eREG13, eREG13, 16 eCCEs (eCCE1, eCCE2, eCCE3, eCCE4, eCCE5, eCCE6, eCCE7, eCCE8, e in the second PDCCH region CE9, eCCE10, eCCE11, shows the case eCCE12, eCCE13, eCCE14, eCCE15, eCCE16) is constructed. Here, eREG (first element) 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 referred to as an eCCE index. For example, in FIG. 20, each DL PRB pair corresponds to each DL PRB pair constituting a certain second PDCCH region shown in FIG. Each eCCE is composed of a plurality of eREGs having different DL PRB pairs. For example, the eCCE is composed of resources obtained by collecting four eREGs of one DL PRB pair. In FIG. 20, one block (a block composed of four consecutive eCCEs) (a block composed of eCCE1, eCCE2, eCCE3, and eCCE4, a block composed of eCCE5, eCCE6, eCCE7, and eCCE8, eCCE9, A block composed of eCCE10, eCCE11, and eCCE12, and a block composed of eCCE13, eCCE14, eCCE15, and eCCE16) means one DL PRB pair resource.

  In FIG. 20, eREGs constituting an eCCE configured by applying Localized mapping are consecutive numbers. In FIG. 20, eCCE1 is composed of eREG1, eREG2, eREG3, and eREG4 of DL PRB pair W, eCCE2 is composed of eREG5, eREG6, eREG7, and eREG8 of DL PRB pair W, and eCCE3 is DL PRB a ECCE4 is composed of eREG13, eREG14, eREG15, eREG16 of DL PRB pair W, eCCE5 is composed of eREG1, eREG2, eREG3, eREG4 of DL PRB pair X, and eREG3. eCCE6 is composed of DL PRB pair X eREG5, eREG6, eREG7, and eREG8, and eCCE7 is DL PRB pair. EREG9, eREG10, eREG11, and eREG12. ECCE8 is composed of DL PRB pair X eREG13, eREG14, eREG15, and eREG16, and eCCE9 is composed of DL PRB pair Y eREG1, eREG3, eREG3, eREG3, eREG3, eREG3 ECCE10 is composed of DL PRB pair Y eREG5, eREG6, eREG7, and eREG8, eCCE11 is composed of DL PRB pair Y eREG9, eREG10, eREG11, and eREG12, and eCCE12 is DL PRYpaG14G The eCCE 13 is composed of eREG1, eREG2, and eREG1 of DL PRB pair Z. ECCE14 is composed of eREG5, eREG6, eREG7, and eREG8 of DL PRB pair Z, eCCE15 is composed of eREG9, eREG10, eREG11, and eREG12 of DL PRB pair Z. It is composed of eREG13, eREG14, eREG15, and eREG16 of pair Z.

  In FIG. 20, 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. 20, it does not mean that all resources in the DL PRB pair are configured as eCCE. For example, a resource in which UE-specific RS is arranged is excluded in advance from resources configuring eCCE. Also good. The physical resources constituting the eREG will be described later.

  FIG. 21 is a diagram illustrating an example of Distributed mapping according to the embodiment of this invention. Here, one second PDCCH region is composed of four DL PRB pairs (DL PRB pair W, DL PRB pair X, DL PRB pair Y, DL PRB pair Z), and in one DL PRB pair. 16 eREGs (enhanced Resource Element Group) (eREG1, eREG2, eREG3, eREG4, eREG5, eREG6, eREG7, eREG8, eREG9, eREG10, eREG11, eREG12, eREG13, eREG13, eREG13, eREG13, eREG13, eREG13, eREG13, eREG13, eREG13, eREG13, 16 eCCEs (eCCE1, eCCE2, eCCE3, eCCE4, eCCE5, eCCE6, eCCE7, eCCE8, e in the second PDCCH region CE9, eCCE10, eCCE11, shows the case eCCE12, eCCE13, eCCE14, eCCE15, eCCE16) is constructed. The configuration of eREG and the numbering of eREG in the second PDCCH region shown in FIG. 21 are the same as the configuration of eREG and the numbering of eREG in the second PDCCH region shown in FIG. The number of eREGs constituting one eCCE of Distributed mapping is the same as the number of eREGs constituting one eCCE of Localized mapping. For example, one eCCE of Distributed mapping is composed of four eREGs, similar to one eCCE of Localized mapping. For example, in FIG. 21, each DL PRB pair corresponds to each DL PRB pair constituting a certain second PDCCH region shown in FIG. Each eCCE is composed of a plurality of eREGs having different DL PRB pairs. For example, the eCCE is composed of four eREGs of four DL PRB pairs, and a resource in which one eREG is collected in each DL PRB pair.

  In FIG. 21, eCCE1 is composed of eREG1 of DL PRB pair W, eREG1 of DL PRB pair X, eREG1 of DL PRB pair Y, and eREG1 of DL PRB pair Z, and eCCE2 is composed of DL PRB pair BREG EREG2 of X and DL PRB pair Y eREG2 and DL PRB pair Z eREG2 are composed, eCCE3 is DL PRB pair W eREG3 and DL PRB pair X eREG3 and DL PRB pair GRE Z The eCCE4 is composed of eREG4 of DL PRB pair W, eREG4 of DL PRB pair X, and e of DL PRB pair Y. EG4 is composed of eREG4 of DL PRB pair Z, eCCE5 is composed of eREG5 of DL PRB pair W, eREG5 of DL PRB pair X and eREG5 of DL PRB pair Y, and eREG5 of DL PRB pair Z It is composed of eREG6 of PRB pair W, eREG6 of DL PRB pair X, eREG6 of DL PRB pair Y, and eREG6 of DL PRB pair Z, eCCE7 is eREG7 of DL PRB pair W, and PRPRp of DL PRB pair W It consists of eREG7 of Y and eREG7 of DL PRB pair Z. eCCE8 is eREG8 and DL PRB pair of DL PRB pair W X eREG8, DL PRB pair Y eREG8 and DL PRB pair Z eREG8, eCCE9 is DL PRB pair W eREG9, DL PRB pair X eREG9 and DL PRB pair Y REREG eCCE10 is composed of eREG10 of DL PRB pair W, eREG10 of DL PRB pair X, eREG10 of DL PRB pair Y, and eREG10 of DL PRB pair Z. eCCE11 is composed of DL PRBp of DL PRB p It consists of eREG11 of PRB pair X, eREG11 of DL PRB pair Y and eREG11 of DL PRB pair Z, and eCC E12 is composed of eREG12 of DL PRB pair W, eREG12 of DL PRB pair X, eREG12 of DL PRB pair Y, and eREG12 of DL PRB pair Z, and eCCE13 is an eREG13 of DL PRB pair W and eREG13 of DL PRB pair W DL PRB pair Y eREG13 and DL PRB pair Z eREG13, eCCE14 consists of DL PRB pair W eREG14, DL PRB pair X eREG14, DL PRB pair Y eREG14 eDL14 eDL14 ECCE15 is DL PRB pair W eREG15 and DL PRB pair X eREG15 and DL PRB pa It is composed of eREG15 of ir Y and eREG15 of DL PRB pair Z, and eCCE16 is composed of eREG16 of DL PRB pair W, eREG16 of DL PRB pair X, eREG16 of DL PRB pair Y and DL PRZ pair GREG16 .

  In FIG. 21, 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 and is divided into four different ones. It indicates that one eCCE is configured from four divided resources (eREG) of DL PRB pair. Note that in FIG. 21, it does not mean that all resources in the DL PRB pair are configured as eREGs. For example, resources in which UE-specific RSs are arranged are excluded in advance from the resources configuring eREGs. Also good. The physical resources constituting the eREG will be described later.

  FIG. 22 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. 22, one grid corresponds to one RE. In this figure, the vertical axis represents the time domain and the horizontal axis represents the frequency domain. Here, a case where UE-specific RSs corresponding to four antenna ports (antenna port 7, antenna port 8, antenna port 9, and antenna port 10) are configured is shown. In one DL PRB pair, 168 REs are configured. Twenty-four REs are configured for UE-specific RS corresponding to four antenna ports. The eREG is configured using an RE obtained by excluding an RE configured for the UE-specific RS from an RE configured in one DL PRB pair. Here, eREG is configured using 144 REs in one DL PRB pair. FIG. 22 shows a case where 16 eREGs are configured with 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 having the lowest frequency and the OFDM symbol having 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 UE-specific RS is skipped, and numbering for the RE for configuring the eREG is performed. Note that the numbers start from ‘1’, ‘2’, ‘3’, ‘4’, ‘5’, ‘6’, ‘7’. Numbering is performed in the order of “8”, “9”, “10”, “11”, “12”, “13”, “14”, “15”, “16”, and numbering up to “16”. Is performed, the numbering is repeated from “1” again. One eREG is composed of nine REs having the same number. For example, eREG1 is composed of 9 REs numbered '1', eREG2 is composed of 9 REs numbered '2', and eREG3 is numbered '3'. EREG4 is composed of 9 REs numbered '4', eREG5 is composed of 9 REs numbered '5', and eREG6 is' It is composed of 9 REs numbered 6 ', eREG7 is composed of 9 REs numbered' 7 ', and eREG8 is 9 REs numbered' 8 '. EREG9 is composed of 9 REs numbered '9', eREG10 is composed of 9 REs numbered '10', and eREG11 is numbered '11' It is composed of 9 attached REs, and eREG12 It is composed of 9 REs numbered '12', eREG 13 is composed of 9 REs numbered '13', and eREG 14 is 9 numbers numbered '14'. It is composed of REs, eREG15 is composed of nine REs numbered with '15', and eREG16 is composed of nine REs numbered with '16'.

  Although the eREG is configured as shown in FIG. 22, the signal of the second PDCCH is not arranged in another signal, for example, an RE in which the CRS, the first PDCCH, and the CSI-RS are arranged. Therefore, in the transmission / reception process of the second PDCCH signal according to the number of bits that can be transmitted / received by the eREG resource excluding the RE in which the CRS, the first PDCCH, and the CSI-RS are arranged, the rate matching process and the derate matching Processing is performed by the base station device 3 and the mobile station device 5.

  FIG. 23 is a diagram illustrating an example of the configuration of the eREG according to the embodiment of this invention. Compared to the example described in FIG. 22, a UE-specific RS corresponding to two antenna ports (antenna port 7 and antenna port 8) is different. In FIG. 23, not all eREGs are composed of the same number of REs, but eREG1, eREG2, eREG3, eREG4, eREG5, eREG6, eREG7, eREG8, eREG9, eREG10, eREG11, and eREG12 each have 10 REGs. Each of eREG13, eREG14, eREG15, and eREG16 is composed of nine REs.

  Different resource mapping methods (Localized mapping, Distributed mapping) may be applied to the second PDCCH region. For example, the second PDCCH configured by eCCE configured by Localized mapping is referred to as Localized ePDCCH. For example, the second PDCCH configured by eCCE configured by Distributed mapping is referred to as “Distributed ePDCCH”.

  For example, the localized ePDCCH is composed of one eCCE (eCCE aggregation 1), two eCCEs (eCCE aggregation 2), or four eCCEs (eCCE aggregation 4). A localized ePDCCH having an eCCE aggregation number of 2 or more includes a plurality of eCCEs having consecutive eCCE numbers. A localized ePDCCH having an eCCE aggregation number of 2 or more is composed of a plurality of eCCEs composed of resources in the same DL PRB pair. For example, in FIG. 20, the localized ePDCCH of eCCE aggregation 2 is eCCE1 and eCCE2, or eCCE3 and eCCE4, or eCCE5 and eCCE6, or eCCE7 and eCCE8, or eCCE9 and eCCE13, or ECCE11 and eCCE12 or ECCE12 And eCCE16. For example, in FIG. 20, the localized ePDCCH of eCCE aggregation 4 is eCCE1, eCCE2, eCCE3, eCCE4, eCCE5, eCCE6, eCCE7, eCCE8, eCCE9, eCCE10, eCCE11, eCCE12, eCCE12, eCCE12, and eCCE12. eCCE16.

  For example, the Distributed ePDCCH is composed of one eCCE (eCCE aggregation 1), two eCCEs (eCCE aggregation 2), four eCCEs (eCCE aggregation 4), or eight eCCE aggregations (eCCE aggregation). 8). A distributed ePDCCH having an eCCE aggregation number of 2 or more is composed of a plurality of eCCEs having consecutive eCCE numbers. For example, in FIG. 21, the distributed ePDCCH of eCCE aggregation 2 is eCCE1 and eCCE2, or eCCE3 and eCCE4, or eCCE5 and eCCE6, or eCCE7 and eCCE8, or eCCE9 and eCCE12, or eCCE11 and ECe13 And eCCE16. For example, in FIG. 21, the distributed ePDCCH of eCCE aggregation 4 is eCCE1 and eCCE2 and eCCE3 and eCCE4, or eCCE5 and eCCE6 and eCCE7 and eCCE8, or eCCE9 and eCCE10 and eCCE13 and eCCE13 and eCCE12. eCCE16. For example, in FIG. 21, a distributed ePDCCH of eCCE aggregation 8 includes eCCE1, eCCE2, eCCE3, eCCE4, eCCE5, eCCE6, eCCE8, eCCE9, eCCE11, eCCE11, eCCE12, eCCE12, and ECCE12 Is done.

  A second PDCCH region configured by a common DL PRB pair is commonly set for the plurality of mobile station apparatuses 5. Different second PDCCHs are transmitted / received to / from different mobile station apparatuses 5 using different eCCEs in the second PDCCH region. A second PDCCH region composed of a common DL PRB pair is set in common, but different resource mapping methods are applied to different mobile station devices 5, and different mobile station devices in the second PDCCH region 5, when the distributed ePDCCH and the localized ePDCCH are transmitted / received, the eREG that transmits / receives the Distributed ePDCCH is different from the eREG that transmits / receives the localized ePDCCH. For example, in a certain DL PRB pair, eREG1, eREG2, eREG3, eREG4, eREG5, eREG6, eREG7, and eREG8 are used as one or more distributed ePDCCH resources, eREG9, eREG10, eREG11, eREG11, eREG13, eREG13, eREG13 The eREG 15 and the eREG 16 may be used as one or more localized ePDCCH resources. From the viewpoint of the mobile station apparatus 5, it is assumed that any resource mapping method is applied to the configured second PDCCH region, and receives and demodulates the second PDCCH. The process of decoding is performed. From the viewpoint of the base station apparatus 3, it is determined that any one type of resource mapping method is applied to a configured second PDCCH region, and a plurality of second PDCCHs are arranged and transmitted. It is determined that both two types of resource mapping methods should be applied to a configured second PDCCH region, and a plurality of second PDCCHs are arranged and transmitted. May

  In the mobile station device 5, one or more second PDCCH regions are configured from the base station device 3. For example, the distributed mapping is applied to the mobile station apparatus 5, the second PDCCH region to which the random beam forming process is applied, and the localized mapping is applied, and the beam forming process suitable for the mobile station apparatus 5 is applied. Two second PDCCH regions are configured with the second PDCCH region. For example, the mobile station device 5 is configured to have two second PDCCH regions to which distributed mapping is applied and to which random beamforming processing is applied.

  The mobile station device 5 is designated (set, configured) to perform processing (monitoring) for detecting the second PDCCH in the second PDCCH region configured by the base station device 3. The designation of monitoring of the second PDCCH may be made automatically (implicitly) by configuring the second PDCCH region in the mobile station apparatus 5, and indicates the configuration of the second PDCCH region. It may be done explicitly by signaling different from signaling. The plurality of mobile station apparatuses 5 can designate the same second PDCCH region from the base station apparatus 3. The mobile station apparatus 5 does not perform the process of detecting the second PDCCH for all eCCEs in the second PDCCH region, but performs the process of detecting the second PDCCH for the restricted eCCE. For example, for each eCCE aggregation number, an ePDCCH candidate that detects the second PDCCH is specified.

  First, the configuration of the ePDCCH candidate of the localized ePDCCH in the second PDCCH region will be described with reference to FIG. As ePDCCH candidate of Localized ePDCCH of eCCE aggregation 1, there are 16 ePDCCH candidate (ePDCCH candidate 1, ePDCCH candidate 2, ePDCCH candidate 3, ePDCCH candidate 3, ePDCCH candidate 3, ePDCCH candidate 3, ePDCCH 7, ePDCCH candidate 8, ePDCCH candidate 9, ePDCCH candidate 10, ePDCCH candidate 11, ePDCCH candidate 12, ePDCCH candidate 13, ePDC CH candidate 14, ePDCCH candidate 15, ePDCCH candidate 16) is constructed. In eCCE aggregation 1, ePDCCH candidate 1 is composed of eCCE 1, ePDCCH candidate 2 is composed of eCCE 2, ePDCCH candidate 3 is composed of eCCE 3, ePDCCH candidate 4 is composed of eCCE 4 and eCCE 4 EPDCCH candidate 6 is composed of eCCE 6, ePDCCH candidate 7 is composed of eCCE 7, ePDCCH candidate 8 is composed of eCCE 8, ePDCCH candidate 9 is composed of eCCE 9 and ePDCCH candid Consists of 10 EPDCCH candidate 11 is composed of eCCE 11, ePDCCH candidate 12 is composed of eCCE 12, ePDCCH candidate 13 is composed of eCCE 13, ePDCCH candidate 14 is composed of eCCE 14, and ePDCCH candidate 15 is composed of ePDCCH candid 15. EPDCCH candidate 16 is composed of eCCE 16.

  As ePDCCH candidate of Localized ePDCCH of eCCE aggregation 2, there are 8 ePDCCH candidate (ePDCCH candidate 1, ePDCCH candidate 2, ePDCCH candidate 3, ePDCCH candidate 3, ePDCCH candidate 3, ePDCCH candidate 3, ePDCCH 7, ePDCCH candidate 8) is configured. In eCCE aggregation 2, ePDCCH candidate 1 is composed of eCCE 1 and eCCE 2, ePDCCH candidate 2 is composed of eCCE 3 and eCCE 4, ePDCCH candidate 3 is composed of eCCE 5 and eCCE 7 and ePDCCH 4 EPDCCH candidate 5 is composed of eCCE 9 and eCCE 10, ePDCCH candidate 6 is composed of eCCE 11 and eCCE 12, ePDCCH candidate 7 is composed of eCCE 13 and eCCE 14 and ePDCCH cand 8 It is composed of eCCE 15 and eCCE 16.

  As ePDCCH candidate of Localized ePDCCH of eCCE aggregation 4, 4 ePDCCH candidate (ePDCCH candidate 1, ePDCCH candidate 2, ePDCCH candidate 3, and ePDCCH candidate 3 and ePDCCH candidate 3 and ePDCCH candidate) In eCCE aggregation 4, ePDCCH candidate 1 is composed of eCCE 1, eCCE 2, eCCE 3 and eCCE 4, ePDCCH candidate 2 is composed of eCCE 5, eCCE 6, eCCE 7 and eCCE 3 and ePDCCH 3 9, eCCE 10, eCCE 11, and eCCE 12, and ePDCCH candidate 4 is composed of eCCE 13, eCCE 14, eCCE 15, and eCCE 16.

  Next, the configuration of the ePDCCH candidate of the Distributed ePDCCH in the second PDCCH region will be described using FIG. As ePDCCH cadidate of eCCE aggregation 1, ePDCCH cadidate, ePDCCH cadidate 1, ePDCCH cadidate 3, ePDCCH cadidate 3, ePDCCH cadidate 3, ePDCCH cadidate 3, ePDCCH cadidate 3, 7, ePDCCH candidate 8, ePDCCH candidate 9, ePDCCH candidate 10, ePDCCH candidate 11, ePDCCH candidate 12, ePDCCH candidate 13, ePDCCH candidate 13, DCCH candidate 14, ePDCCH candidate 15, ePDCCH candidate 16) is constructed. In eCCE aggregation 1, ePDCCH candidate 1 is composed of eCCE 1, ePDCCH candidate 2 is composed of eCCE 2, ePDCCH candidate 3 is composed of eCCE 3, ePDCCH candidate 4 is composed of eCCE 4 and eCCE 4 EPDCCH candidate 6 is composed of eCCE 6, ePDCCH candidate 7 is composed of eCCE 7, ePDCCH candidate 8 is composed of eCCE 8, ePDCCH candidate 9 is composed of eCCE 9 and ePDCCH candid Consists of 10 EPDCCH candidate 11 is composed of eCCE 11, ePDCCH candidate 12 is composed of eCCE 12, ePDCCH candidate 13 is composed of eCCE 13, ePDCCH candidate 14 is composed of eCCE 14, and ePDCCH candidate 15 is composed of ePDCCH candid 15. EPDCCH candidate 16 is composed of eCCE 16.

  As ePDCCH candidate of eCCE aggregation 2 distributed ePDCCH, 8 ePDCCH candidate (ePDCCH candidate 1, ePDCCH candidate 2, ePDCCH candidate 3, ePDCCH candidate 3, ePDCCH candidate 3, ePDCCH candidate 3, ePDCCH candidate 3, ePDCCH 7, ePDCCH candidate 8) is configured. In eCCE aggregation 2, ePDCCH candidate 1 is composed of eCCE 1 and eCCE 2, ePDCCH candidate 2 is composed of eCCE 3 and eCCE 4, ePDCCH candidate 3 is composed of eCCE 5 and eCCE 7 and ePDCCH 4 EPDCCH candidate 5 is composed of eCCE 9 and eCCE 10, ePDCCH candidate 6 is composed of eCCE 11 and eCCE 12, ePDCCH candidate 7 is composed of eCCE 13 and eCCE 14 and ePDCCH cand 8 It is composed of eCCE 15 and eCCE 16.

  As ePDCCH candidate of eCCE aggregation 4 distributed ePDCCH, 4 ePDCCH candinate (ePDCCH candidate 1, ePDCCH candidate 2, ePDCCH candidate 3 and ePDCCH candidate 3 and ePDCCH candidate 3 and ePDCCH candidate 3) In eCCE aggregation 4, ePDCCH candidate 1 is composed of eCCE 1, eCCE 2, eCCE 3 and eCCE 4, ePDCCH candidate 2 is composed of eCCE 5, eCCE 6, eCCE 7 and eCCE 3 and ePDCCH 3 9, eCCE 10, eCCE 11, and eCCE 12, and ePDCCH candidate 4 is composed of eCCE 13, eCCE 14, eCCE 15, and eCCE 16.

  As ePDCCH candidate of eCCE aggregation 8 Distributed ePDCCH, two ePDCCH candinate (ePDCCH candidate 1 and ePDCCH candidate 2) are configured in the second PDCCH region. In eCCE aggregation 8, ePDCCH candidate 1 is composed of eCCE 1, eCCE 2, eCCE 3, eCCE 4, eCCE 5, eCCE 6, eCCE 7 and eCCE 8, ePDCCH candate 2 is eCCE 9, eCCE 9, eCCE 9, eCCE 9, eCCE 12, eCCE 13, eCCE 14, eCCE 15, and eCCE 16 are included.

  For example, for each second PDCCH region, a bitmap in which 1 bit is configured for each ePDCCH candidate (referred to as an ePDCCH candidate bitmap), which ePDCCH candidate is subjected to the process of detecting the second PDCCH. Indicated by. The mobile station apparatus 5 performs processing for detecting the second PDCCH for the ePDCCH candidate in which the bit “1” is indicated, and the mobile station apparatus 5 performs the second PDCCH for the ePDCCH candidate in which the bit “0” is indicated. The detection process is not performed. For each eCCE aggregation number, the ePDCCH cadbitate bitmap is notified from the base station device 3 to the mobile station device 5.

  Information indicating the configuration (designation, setting) of the second PDCCH region is exchanged between the base station device 3 and the mobile station device 5 before starting communication using the second PDCCH. For example, the information is performed using RRC (Radio Resource Control) signaling. Specifically, the mobile station apparatus 5 receives information indicating the position (allocation) of the DL PRB pair in the second PDCCH region from the base station apparatus 3. In addition, information indicating the type of eCCE resource mapping (Localized mapping or Distributed mapping) is notified from the base station apparatus 3 to the mobile station apparatus 5 for each of the second PDCCH regions. In addition, not the information that explicitly indicates the type of resource mapping applied to the second PDCCH region, but other information is notified from the base station device 3 to the mobile station device 5, and the second information is implicitly based on the information. The mobile station apparatus 5 may recognize the type of eCCE resource mapping of the PDCCH. For example, information indicating the transmission method of the second PDCCH in each second PDCCH region is notified from the base station apparatus 3 to the mobile station apparatus 5, and a beam forming process suitable for the mobile station apparatus 5 is applied. When the transmission method is indicated, the mobile station apparatus 5 recognizes that the eCCE resource mapping of the second PDCCH region is Localized mapping, and when the transmission method to which random beamforming processing is applied is indicated The mobile station apparatus 5 recognizes that the eCCE resource mapping of the second PDCCH region is Distributed mapping. Also, as a default, information indicating that only when an eCCE resource mapping of any second PDCCH is set in advance in the second PDCCH region and an eCCE resource mapping different from the setting is used. May be notified from the base station apparatus 3 to the mobile station apparatus 5. Further, in some of the second PDCCH regions, it may be determined in advance that one eCCE resource mapping type, for example, Distributed mapping, is applied.

  The mobile station apparatus 5 demodulates the second PDCCH signal using the UE-specific RS received in the second PDCCH region set by the base station apparatus 3, and the second PDCCH addressed to the mobile station apparatus 5 The process which detects is performed. For example, the mobile station apparatus 5 performs demodulation of the second PDCCH signal using the UE-specific RS in the DL PRB pair to which the resource to be demodulated belongs. The eREG is previously associated with one of the antenna ports, and the mobile station apparatus 5 demodulates the signal of the second PDCCH based on the eREG that constitutes the second PDCCH. Performed using RS. In addition, in the second PDCCH region to which the localized mapping is applied and the second PDCCH region to which the distributed mapping is applied, different associations are used for the association between the eREGs in the DL PRB pair and the antenna ports. Also good.

  Hereinafter, a control signal mapped to the second PDCCH will be described. The control signal mapped to the second PDCCH is processed for each control information (DCI) for one mobile station apparatus 5 and, like the data signal, scramble processing, modulation processing, layer mapping processing, precoding processing, etc. Can be done. Here, the layer mapping process means a part of the MIMO signal process performed when multi-antenna transmission is applied to the second PDCCH. The control signal mapped to the second PDCCH is subjected to a common precoding process together with the UE-specific RS. At this time, the precoding process is preferably performed with precoding weights suitable for the unit of the mobile station apparatus 5.

  Moreover, UE-specific RS is multiplexed by the base station apparatus 3 by DL PRB pair by which 2nd PDCCH is arrange | positioned. The mobile station apparatus 5 demodulates the second PDCCH signal using the UE-specific RS. The UE-specific RS used for demodulation of the second PDCCH is the eREG constituting the second PDCCH or the UE-specific RS of the antenna port corresponding to the eCCE. Antenna ports corresponding to eREG and eCCE in the second PDCCH region are set in advance.

  For example, in FIG. 20, in the second PDCCH region to which localized mapping is applied, eCCE1, eCCE5, eCCE9, and eCCE13 correspond to antenna port 7, and eCCE2, eCCE6, eCCE10, and eCCE14 correspond to antenna port 8. ECCE3, eCCE7, eCCE11, and eCCE15 correspond to the antenna port 9, and eCCE4, eCCE8, eCCE12, and eCCE16 correspond to the antenna port 10 in advance. As shown in FIG. 4, it is used when UE-specific RSs of four antenna ports are configured in the second PDCCH region. For example, in FIG. 20, in the second PDCCH region to which localized mapping is applied, eCCE1, eCCE5, eCCE9, and eCCE13 correspond to antenna port 7, and eCCE2, eCCE6, eCCE10, and eCCE14 correspond to antenna port 7. ECCE3, eCCE7, eCCE11, and eCCE15 correspond to the antenna port 8, and eCCE4, eCCE8, eCCE12, and eCCE16 correspond to the antenna port 8 in advance. As shown in FIG. 4, it is used when UE-specific RSs of two antenna ports are configured in the second PDCCH region.

  For example, in FIG. 21, in the second PDCCH region to which distributed mapping is applied, eCCE1, eCCE2, eCCE3, and eCCE4 correspond to antenna port 7, and eCCE5, eCCE6, eCCE7, and eCCE8 correspond to antenna port 8. ECCE9, eCCE10, eCCE11, and eCCE12 correspond to the antenna port 9, and eCCE13, eCCE14, eCCE15, and eCCE16 correspond to the antenna port 10 in advance. As shown in FIG. 4, it is used when UE-specific RSs of four antenna ports are configured in the second PDCCH region. For example, in FIG. 21, in the second PDCCH region to which distributed mapping is applied, eCCE1, eCCE2, eCCE3, and eCCE4 correspond to antenna port 7, and eCCE5, eCCE6, eCCE7, and eCCE8 correspond to antenna port 7. ECCE9, eCCE10, eCCE11, and eCCE12 correspond to the antenna port 8, and eCCE13, eCCE14, eCCE15, and eCCE16 correspond to the antenna port 8 in advance. As shown in FIG. 4, it is used when UE-specific RSs of two antenna ports are configured in the second PDCCH region.

  Each eREG corresponds to the antenna port, and the mobile station apparatus 5 may determine the UE-specific RS antenna port used for demodulation from the eREG configuring the second PDCCH. For example, in the second PDCCH region to which localized mapping is applied and in the second PDCCH region to which distributed mapping is applied, eREG1, eREG2, eREG3, and eREG4 correspond to antenna port 7, and eREG5, eREG6, and eREG7 and eREG8 correspond to the antenna port 8, eREG9, eREG10, eREG11 and eREG12 correspond to the antenna port 9, and eREG13, eREG14, eREG15 and eREG16 correspond to the antenna port 10. Such a setting is used, for example, when UE-specific RSs of four antenna ports are configured in the second PDCCH region as shown in FIG. For example, antenna port 7 includes eREG1, eREG2, eREG3, eREG4, eREG5, eREG6, eREG7, and eREG8 in both the second PDCCH region to which localized mapping is applied and the second PDCCH region to which distributed mapping is applied. EREG9, eREG10, eREG11, eREG12, eREG13, eREG14, eREG15, and eREG16 are set in advance so as to correspond to the antenna port 8. Such a setting is, for example, as shown in FIG. This is used when UE-specific RSs of two antenna ports are configured in the second PDCCH region.

  When the eCCE aggregation number is 2 or more, control may be performed so that only one antenna port is used for the second PDCCH. For example, when the localized ePDCCH of eCCE aggregation 2 is composed of eCCE1 and eCCE2 shown in FIG. 20 and eCCE1 is set in advance to correspond to antenna port 7 and eCCE2 to antenna port 8, the base station apparatus 3 has antenna port 7 Or the localized ePDCCH signal and the UE-specific RS are transmitted to the mobile station device 5 using only the antenna port 8, and the mobile station device 5 uses the UE-specific RS of the antenna port 7 or the antenna port 8 to transmit the signal. You may make it demodulate the signal of Localized ePDCCH. In eCCE aggregation 4, control may be performed so that only two antenna ports are used for the second PDCCH. For example, the localized ePDCCH of eCCE aggregation 4 is composed of eCCE1, eCCE2, eCCE3 and eCCE4 shown in FIG. 20, eCCE1 corresponds to antenna port 7, eCCE2 corresponds to antenna port 8, eCCE3 corresponds to antenna port 9, and eCCE4 corresponds to antenna port 10. Then, when preset, the base station device 3 transmits the signals of the localized ePDCCH eCCE1 and eCCE2 and the UE-specific RS to the mobile station device 5 using only the antenna port 7 or the antenna port 8. Using only the antenna port 9 or the antenna port 10, the eCCE 3 and eCCE 4 signals of the localized ePDCCH and the UE-specific RS are transmitted to the mobile station apparatus 5. The mobile station apparatus 5 demodulates the eCCE1 and eCCE2 signals of the localized ePDCCH using the UE-specific RS of the antenna port 7 or the antenna port 8, and also UE-specific of the antenna port 9 or the antenna port 10 You may make it demodulate the signal of eCCE3 and eCCE4 of the localized ePDCCH using RS. In this case, the base station device 3 forms the antenna port used for transmission of the eCCE1 and eCCE2 signals and the antenna port used for transmission of the eCCE3 and eCCE4 signals by a common precoding process, so that the mobile station device 5 The channel estimation characteristics in can be improved. Regarding a plurality of eCCEs constituting a localized ePDCCH, an eCCE is transmitted using any antenna port for a plurality of eCCEs corresponding to a plurality of antenna ports in which UE-specific RSs are arranged in the same downlink resource element, For a plurality of eCCEs corresponding to a plurality of antenna ports in which UE-specific RSs are arranged in different downlink resource elements, eCCEs may be transmitted using different antenna ports.

  FIG. 24 is a diagram for explaining an example of second PDCCH monitoring of the mobile station apparatus 5 according to the embodiment of the present invention. FIG. 24 illustrates a case where two second PDCCH regions (second PDCCH region 1 and second PDCCH region 2) are configured for mobile station apparatus 5. In the mobile station apparatus 5, a search space is set in each second PDCCH region. The search space means a logical area in which the mobile station device 5 performs decoding detection of the second PDCCH within the second PDCCH area. The Search space is composed of a plurality of second PDCCH candidates. The second PDCCH candidate is a target on which the mobile station apparatus 5 performs decoding detection of the second PDCCH. For each eCCE aggregation number, different second PDCCH candidates are composed of different eCCEs (including one eCCE and a plurality of eCCEs).

  A plurality of search spaces (first search space, second search space) are set in the mobile station apparatus 5 in which a plurality of second PDCCH regions are configured. For example, distributed mapping is applied to some second PDCCH regions of the plurality of second PDCCH regions configured in the mobile station apparatus 5, and localized mapping is applied to different second PDCCH regions. The

  The number of second PDCCH candidates for the first Search space may be different from the number of second PDCCH candidates for the second Search space. In addition, in a certain number of eCCE sets, the number of second PDCCH candidates in the first Search space is the same as the number of second PDCCH candidates in the second Search space, and in the number of different eCCE sets, the first Search The number of second PDCCH candidates in the space may be different from the number of second PDCCH candidates in the second Search space. Further, in a certain number of eCCE sets, the number of second PDCCH candidates in the first Search space is larger than the number of second PDCCH candidates in the second Search space, and in the case of different eCCE sets, the number of first Search space The number of second PDCCH candidates may be smaller than the number of second PDCCH candidates in the second Search space. In addition, the second PDCCH candidates for a certain number of eCCE sets may be set in the search space of one second PDCCH region, and may not be set in the search space of another second PDCCH region. Further, the number of second PDCCH candidates in the search space in one second PDCCH region may be changed according to the number of second PDCCH regions configured in the mobile station apparatus 5. For example, as the number of second PDCCH regions configured in the mobile station device 5 increases, the number of second PDCCH candidates for the search space in one second PDCCH region may be reduced.

  In the communication system 1, as shown in FIG. 15, a plurality of PUCCH (hereinafter referred to as ACK / NACK PUCCH) resources for transmission / reception of ACK / NACK are prepared. The ACK / NACK PUCCH resource for the PDSCH in the scheduling (dynamic scheduling) in which the second PDCCH is basically used for the allocation of the PDSCH resource is included in the eCCE index of one or more eCCEs used for the second PDCCH. Accordingly, ACK / NACK PUCCH resources are implicitly allocated to the mobile station apparatus 5.

  A method of implicitly (implicitly) ACK / NACK PUCCH resource allocation from the eCCE constituting the second PDCCH will be described. The eCCE and ACK / NACK PUCCH resources of the second PDCCH region are associated based on a predetermined rule. In the embodiment of the present invention, an eCCE identification number (eCCE index) and an ACK / NACK PUCCH resource identification number (PUCCH resource index) are associated in advance. ) May be associated with the PUCCH resource index. For example, the mobile station apparatus 5 uses the resource of the ACK / NACK PUCCH corresponding to the eCCE having the smallest number among the eCCEs used in the second PDCCH in which the DCI addressed to itself is detected, and uses the second PDCCH ACK / NACK (signal obtained by modulating ACK / NACK information) is transmitted with respect to PDSCH data in which resource allocation is indicated by. The base station apparatus 3 recognizes the association between the eCCE and the ACK / NACK PUCCH resource in the same manner as the mobile station apparatus 5 and considers the ACK / NACK PUCCH resource to be allocated to the mobile station apparatus 5 in the second An eCCE used for PDCCH is allocated. That is, the mobile station apparatus 5 recognizes the resource of the ACK / NACK PUCCH allocated to the own apparatus based on the eCCE used for the second PDCCH in which the DCI addressed to the own apparatus is detected.

  In the embodiment of the present invention, regarding the association between eCCEs and ACK / NACK PUCCH resources, different rules are used for eCCEs to which localized mapping is applied and eCCEs to which distributed mapping is applied. In the embodiment of the present invention, the resource of the ACK / NACK PUCCH to which the distributed mapping eCCE corresponds corresponds to any eCCE of a plurality of eCCEs of a localized mapping configured using any of a plurality of eREGs that configure the eCCE. And ACK / NACK PUCCH resources corresponding to.

  Regarding the association between eCCEs and ACK / NACK PUCCH resources, the following rules are used for eCCEs to which Localized mapping is applied. In the second PDCCH region, the PUCCH resource index corresponds one-to-one in the order of the eCCE index. In FIG. 20, in the second PDCCH region using eCCE to which Localized mapping is applied, eCCE1 corresponds to PUCCH resource 1, eCCE2 corresponds to PUCCH resource 2, eCCE3 corresponds to PUCCH resource 3, and eCCE4. Corresponds to PUCCH resource 4, eCCE5 corresponds to PUCCH resource 5, eCCE6 corresponds to PUCCH resource 6, eCCE7 corresponds to PUCCH resource 7, eCCE8 corresponds to PUCCH resource 8, ce ECCE 10 corresponds to PUCCH resource 10 and eCCE 11 corresponds to PUCCH res urce 11, eCCE 12 corresponds to PUCCH resource 12, eCCE 13 corresponds to PUCCH resource 13, eCCE 14 corresponds to PUCCH resource 14, eCCE 15 corresponds to PUCCH resource 15, eCCE 16 corresponds to PUCCH 16 .

  Regarding the association between eCCEs and ACK / NACK PUCCH resources, the following rules are used for eCCEs to which distributed mapping is applied. In FIG. 21, in the second PDCCH region using eCCE to which distributed mapping is applied, eCCE1 corresponds to PUCCH resource 1, eCCE2 corresponds to PUCCH resource 5, eCCE3 corresponds to PUCCH resource 9, and eCCE4 Corresponding to PUCCH resource 13, eCCE5 corresponds to PUCCH resource 2, eCCE6 corresponds to PUCCH resource 6, eCCE7 corresponds to PUCCH resource 10, eCCE8 corresponds to PUCCH resource 9, and ceE ECCE 10 corresponds to PUCCH resource 7 and eCCE 11 corresponds to PUCCH corresponding to resource 11, eCCE 12 corresponds to PUCCH resource 15, eCCE 13 corresponds to PUCCH resource 4, eCCE 14 corresponds to PUCCH resource 8, eCCE 15 corresponds to PUCCH resource 12, eCCE 16 PU .

  A plurality of eREG1s constituting the distributed mapping eCCE1 is used for the localized mapping eCCE1, eCCE5, eCCE9, and eCCE13. A plurality of eREGs 2 constituting the distributed mapping eCCE2 are used for localized mapping eCCE1, eCCE5, eCCE9, and eCCE13. A plurality of eREGs 3 constituting the distributed mapping eCCE3 are used for localized mapping eCCE1, eCCE5, eCCE9, and eCCE13. A plurality of eREG4s constituting the distributed mapping eCCE4 is used for localized mapping eCCE1, eCCE5, eCCE9, and eCCE13. The plurality of eREGs 5 constituting the distributed mapping eCCE5 are used for the localized mapping eCCE2, eCCE6, eCCE10, and eCCE14. A plurality of eREGs 6 constituting the distributed mapping eCCE6 are used for the localized mapping eCCE2, eCCE6, eCCE10, and eCCE14. A plurality of eREGs 7 constituting the distributed mapping eCCE 7 are used for the localized mapping eCCE 2, eCCE 6, eCCE 10, and eCCE 14. A plurality of eREGs 8 constituting the distributed mapping eCCE 8 are used for the localized mapping eCCE 2, eCCE 6, eCCE 10, and eCCE 14. The plurality of eREGs 9 constituting the distributed mapping eCCE 9 are used for the localized mapping eCCE 3, eCCE 7, eCCE 11, and eCCE 15. The plurality of eREGs 10 constituting the distributed mapping eCCE 10 are used for the localized mapping eCCE 3, eCCE 7, eCCE 11, and eCCE 15. The plurality of eREGs 11 constituting the distributed mapping eCCE 11 are used for the localized mapping eCCE 3, eCCE 7, eCCE 11, and eCCE 15. The plurality of eREGs 12 constituting the distributed mapping eCCE 12 are used for the localized mapping eCCE 3, eCCE 7, eCCE 11, and eCCE 15. A plurality of eREGs 13 constituting the distributed mapping eCCE 13 are used for localized mapping eCCE4, eCCE8, eCCE12, and eCCE16. The plurality of eREGs 14 constituting the distributed mapping eCCE 14 is used for the localized mapping eCCE4, eCCE8, eCCE12, and eCCE16. The plurality of eREGs 15 constituting the distributed mapping eCCE 15 are used for the localized mapping eCCE 4, eCCE 8, eCCE 12, and eCCE 16. A plurality of eREGs 16 constituting the distributed mapping eCCE 16 are used for the localized mapping eCCE 4, eCCE 8, eCCE 12, and eCCE 16.

  For example, for eCCE1, eCCE2, eCCE3, and eCCE4 to which distributed mapping is applied, the PUCCH resource index corresponding to each eCCE is obtained by an algorithm using the calculation formula of (eCCE index-1) × 4 + 1. For example, for eCCE5, eCCE6, eCCE7, eCCE8 to which distributed mapping is applied, the PUCCH resource index corresponding to each eCCE is obtained by an algorithm using the calculation formula of (eCCE index-1-4) × 4 + 2. . For example, for eCCE9, eCCE10, eCCE11, eCCE12 to which distributed mapping is applied, the PUCCH resource index corresponding to each eCCE is calculated by an algorithm using the calculation formula of (eCCE index-1-4-4) × 4 + 3. Desired. For example, for eCCE13, eCCE14, eCCE15, and eCCE16 to which distributed mapping is applied, PUCCH resource corresponding to each eCCE is calculated by an algorithm using the calculation formula of (eCCE index-1-4-4-4) × 4 + 4. An index is required. It is possible to generalize the above algorithm by using a minimum eCCE index of a localized mapping eCCE (L for convenience of explanation) configured using a plurality of eREGs constituting an eCCE to which distributed mapping is applied. it can. For eCCE to which distributed mapping is applied, a PUCCH resource index corresponding to each eCCE is obtained by an algorithm using a calculation formula of (eCCE index-1−4 × (L−1)) × 4 + L.

  In addition, when the second PDCCH is configured by a plurality of eCCEs, an uplink having only one ACK / NACK PUCCH resource corresponding to any eCCE among the plurality of eCCEs configuring the second PDCCH. Used in subframes and transmitted / received. For example, an ACK / NACK PUCCH resource corresponding to the eCCE having the smallest eCCE index among the eCCEs constituting the second PDCCH is used. Such a rule is recognized by both the base station apparatus 3 and the mobile station apparatus 5, and the ACK / NACK PUCCH resource to be used is determined and selected in each. In addition, when the second PDCCH is configured by a plurality of eCCEs, the resource of a plurality of ACK / NACK PUCCHs corresponding to the plurality of eCCEs configuring the second PDCCH is not performed, but any eCCE is selected. Any of the ACK / NACK PUCCH resources may be used. For example, an ACK / NACK PUCCH resource with the smallest PUCCH resource index may be selected from among a plurality of corresponding ACK / NACK PUCCH resources.

  As described above, as shown in FIG. 20 and FIG. 21, in the second PDCCH region, the same eREG configuration is used for Localized mapping and Distributed mapping, and the configuration of the localized mapping eCCE shown in FIG. 20 and FIG. Using the distributed mapping eCCE configuration, with respect to the association between the eCCE index and the PUCCH resource index, the mapping rule for the localized mapping eCCE and the mapping rule for the eCCE of the distributed mapping are used. Common ACK / NACK PU for Localized ePDCCH and Distributed ePDCCH in PDCCH region Since CH resources can be reserved, an increase in overhead can be avoided, and collision of ACK / NACK PUCCH resources for each second PDCCH allocated in a certain downlink subframe can be avoided. Therefore, the complexity of the scheduler of the base station apparatus 3 is reduced. The eREG used for any second PDCCH cannot basically be used for a different second PDCCH (except when MU-MIMO is applied). For example, when four second PDCCHs are arranged using eREG1, eREG2, eREG3, and eREG4 that constitute eCCE1, eCCE2, eCCE3, and eCCE4 of distributed mapping, eREG1, eREG2, eREG3, and eREG4 are used. One or more second PDCCHs using the localized mapping eCCE1, eCCE5, eCCE9, and eCCE13 cannot be arranged in the same downlink subframe. Therefore, in that case, PUCCH resource 1, PUCCH resource 5, PUCCH resource 9, and PUCCH resource 13 are used only in mobile station apparatus 5 to which PDSCH is allocated in the second PDCCH configured by distributed mapping eCCE. ACK / NACK PUCCH resources do not collide between mobile station apparatuses 5. In the embodiment of the present application, it is not necessary to transmit / receive information for avoiding collision of ACK / NACK PUCCH resources with downlink control information, and an increase in downlink overhead can be avoided.

<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 the received signals of PUCCH and PUSCH received from the mobile station apparatus 5 by the reception antenna 109 using the UL RS according to an instruction from the control unit 105, and obtains control information and information data. Extract. The reception processing unit 101 performs a process of extracting UCI from an uplink subframe, UL PRB, to which the own apparatus assigns PUCCH resources to the mobile station 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. Details of the reception processing unit 101 will be described later.

  Also, the reception processing unit 101 detects (receives) a preamble sequence from the received PRACH signal received from the mobile station apparatus 5 by the reception antenna 109 in accordance with an instruction from the control unit 105. The reception processing unit 101 also estimates the arrival timing (reception timing) along with the 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.

  Also, the reception processing unit 101 measures the channel quality of one or more UL PRBs (UL PRB pairs) using the SRS received from the mobile station apparatus 5. Also, the reception processing unit 101 detects (calculates and measures) an uplink synchronization shift using the SRS received from the mobile station apparatus 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 radio resource control unit 103 allocates resources to PDCCH (first PDCCH, second PDCCH), allocates resources to PUCCH, allocates DL PRB pair to PDSCH, allocates UL PRB pair to PUSCH, and allocates resources to PRACH. Allocation, resource allocation for SRS, modulation scheme / coding rate / transmission power control value / phase rotation amount (weighting value) used for precoding processing, phase rotation amount (UE-specific RS precoding processing) Set weighting value). 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 2nd PDCCH area | regions, and sets DL PRB pair used for each 2nd PDCCH area | region. Also, the radio resource control unit 103 sets an eCCE resource mapping method for each second PDCCH region for each mobile station apparatus 5. Part of the information set by the radio resource control unit 103 is notified to the mobile station device 5 via the transmission processing unit 107, for example, information indicating the DL PRB pair of the second PDCCH region, eCCE of the second PDCCH region Information indicating the resource mapping method is notified to the mobile station apparatus 5.

  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 mobile station apparatus 5.

  The radio resource control unit 103 outputs various control signals to the control unit 105. For example, the control signal includes a control signal indicating a second PDCCH resource mapping method, a control signal indicating an ACK / NACK PUCCH resource, a control signal indicating an allocation of the second PDCCH resource, and a phase used for precoding processing. This is a control signal indicating the amount of rotation.

  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 PDCCH, sets a modulation scheme for the PDSCH, and encodes the PDSCH and the coding rate for the PDCCH (second PDCCH eCCE aggregation number), UE-specific RS setting in the second PDCCH region, antenna port transmitting eCCE signal, PDSCH and PDCCH and UE-specific RS precoding processing setting, etc. Control is performed on the transmission processing unit 107. Also, the control unit 105 generates DCI transmitted using the PDCCH 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 PDCCH is a downlink assignment, an uplink grant, or the like. In addition, the control unit 105 sends information indicating the second PDCCH region, information indicating the eCCE resource mapping method of the second PDCCH region, etc. to the mobile station device 5 via the transmission processing unit 107. Control to use and transmit.

  The control unit 105, based on the control signal input from the radio resource control unit 103, allocation of UL PRB pair to PUSCH, resource allocation to PUCCH, PUSCH and PUCCH modulation scheme setting, PUSCH coding rate setting, Control such as detection processing for PUCCH, setting of a code sequence for PUCCH, allocation of resources for PRACH, allocation of resources for SRS, and the like is performed on reception processing section 101. For example, the control unit 105 performs setting of an ACK / NACK PUCCH resource for performing reception processing on the reception processing unit 101 in order to acquire ACK / NACK for the PDSCH for which resource allocation is indicated by the second PDCCH. In addition, the control unit 105 receives the UCI transmitted from the mobile station apparatus 5 using 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, from the reception processing unit 101, information indicating the arrival timing of the detected preamble sequence and information indicating the uplink synchronization shift detected from the received SRS, 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 mobile station apparatus 5 via the transmission processing unit 107.

  The transmission processing unit 107 generates a signal to be transmitted using PDCCH and PDSCH based on the control signal input from the control unit 105 and transmits the signal via the transmission antenna 111. The transmission processing unit 107 receives the information indicating the second PDCCH region, the information indicating the eCCE resource mapping method of the second PDCCH region, the information data input from the upper layer, etc., input from the radio resource control unit 103 Is transmitted to the mobile station apparatus 5 using the PDSCH, and the DCI input from the control unit 105 is transmitted to the mobile station apparatus 5 using the PDCCH (first PDCCH, second PDCCH). Moreover, the transmission process part 107 transmits CRS, UE-specific RS, and CSI-RS. 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 physical downlink shared channel processing units 201-1 to 201-M (hereinafter referred to as physical downlink shared channel processing units 201-1 to 201-M). Physical downlink), a plurality of physical downlink control channel processing units 203-1 to 203-M (hereinafter, physical downlink control channel processing units 203-1 to 203-M are combined). Control channel processing unit 203), downlink pilot channel processing unit 205, precoding 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, transmission RF Radio Frequency; radio frequency) unit 215, and configured to include a transmitting antenna 111. Since each physical downlink shared channel processing unit 201 and each physical downlink 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 physical downlink shared channel processing unit 201 includes a turbo coding unit 219, a data modulation unit 221 and a precoding processing unit 229, respectively. Also, as shown in this figure, the physical downlink control channel processing unit 203 includes a convolutional coding unit 223, a QPSK modulation unit 225, and a precoding processing unit 227. The physical downlink shared channel processing unit 201 performs baseband signal processing for transmitting information data to the mobile station apparatus 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 data encoded by the turbo coding unit 219 as a modulation method inputted from the control unit 105, for example, QPSK (Quadrature Phase Shift Keying), 16QAM (16-value quadrature amplitude modulation). 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. Precoding processing section 229 performs precoding processing (beamforming processing) on the signal input from data modulation section 221 and outputs the result to multiplexing section 207. Here, the precoding process performs phase rotation or the like on the generated signal so that the mobile station apparatus 5 can efficiently receive (for example, the interference is minimized so that the reception power is maximized). Preferably it is done. Note that the precoding processing unit 229 outputs the signal input from the data modulation unit 221 to the multiplexing unit 207 as it is when the precoding process is not performed on the signal input from the data modulation unit 221.

  The physical downlink control channel processing unit 203 performs baseband signal processing for transmitting the DCI input from the control unit 105 in the OFDM scheme. The convolutional coding unit 223 performs convolutional coding for increasing DCI error tolerance based on the coding rate input from the control unit 105. Here, DCI is controlled in bit units. It should be noted that the coding rate of DCI transmitted on the second PDCCH 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 DCI to the QPSK modulation unit 225. The QPSK modulation unit 225 modulates the DCI 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 pilot channel processing unit 205 generates a downlink reference signal (CRS, UE-specific RS, CSI-RS) that is a known signal in the mobile station apparatus 5 and outputs the downlink reference signal (CRS, UE-specific RS, CSI-RS) to the precoding processing unit 231. The precoding processing unit 231 does not perform precoding processing on the CRS and CSI-RS input from the downlink pilot channel processing unit 205 and outputs them to the multiplexing unit 207. Precoding processing section 231 performs precoding processing on the UE-specific RS input from downlink pilot channel processing section 205 and outputs the result to multiplexing section 207. For example, the precoding processing unit 231 performs precoding processing of beamforming processing suitable for the mobile station device 5 on the UE-specific RS. For example, the precoding processing unit 231 performs precoding processing of random beamforming processing on the UE-specific RS. The precoding processing unit 231 performs the same processing as the processing performed on the PDSCH in the precoding processing unit 229 and / or the processing performed on the second PDCCH in the precoding processing unit 227 on the UE-specific RS. More specifically, the precoding processing unit 231 performs precoding processing on the eCCE signal, and also performs similar precoding processing on the UE-specific RS corresponding to the eCCE and the antenna port. Therefore, when demodulating the signal of the second PDCCH to which precoding processing is applied in the mobile station apparatus 5, the UE-specific RS uses the fluctuation of the propagation path (transmission path) in the downlink and the phase by the precoding processing unit 227. It can be used to estimate an equalization channel with rotation. That is, the base station device 3 does not need to notify the mobile station device 5 of the information (phase rotation amount) of the precoding processing by the precoding processing unit 227, and the mobile station device 5 Can be demodulated.

  Multiplexer 207 receives a signal input from downlink pilot channel processor 205, a signal input from each physical downlink shared channel processor 201, and a signal input from each physical downlink control channel processor 203. Are multiplexed into the downlink subframe according to the instruction from the control unit 105. Control signals related to DL PRB pair allocation to PDSCH set by radio resource control section 103, resource allocation to PDCCH (first PDCCH, second PDCCH), and eCCE resource mapping method of second PDCCH are controlled. Based on the control signal input to the unit 105, the control unit 105 controls the processing of the multiplexing unit 207. For example, the multiplexing unit 207 multiplexes the second PDCCH signal with downlink resources using the eCCE aggregation number set by the radio resource control unit 103. 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 section 215 converts (up-converts) the intermediate frequency signal into a high frequency signal, removes excess frequency components, amplifies the power, and transmits to the mobile station apparatus 5 via the transmission antenna 111. Send.

<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 mobile station apparatus 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. The PUSCH channel equalization unit 319 outputs the adjusted signal to the IDFT unit 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 mobile station apparatus 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 mobile station 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, if the correlation value is higher than a preset threshold value, the preamble detection unit 331 receives from the mobile station device 5 the same signal as the preamble sequence used to generate the replica signal used for the correlation processing. Judge that it was sent. 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 based on control information (DCI) transmitted from the base station device 3 to the mobile station device 5 using PDCCH and control information (RRC signaling) transmitted using PDSCH. 315, a data demodulation unit 325, a turbo decoding unit 327, a propagation path estimation unit 317, and a physical uplink control channel detection unit 329 are controlled. Also, the control unit 105 determines which resource is the PRACH, PUSCH, PUCCH, and SRS that each mobile station device 5 has transmitted (may have transmitted) based on the control information that the base station device 3 has transmitted to the mobile station device 5. It is ascertained whether it is configured by (uplink subframe, UL PRB (UL PRB pair), frequency domain code sequence, time domain code sequence).

<Overall configuration of mobile station apparatus 5>
Hereinafter, the configuration of the mobile station apparatus 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 mobile station apparatus 5 according to the embodiment of the present invention. As shown in this figure, the mobile station apparatus 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). Reference numeral 405 denotes a transmission processing unit (first transmission processing unit) 407.

  The reception processing unit 401 receives a signal from the base station apparatus 3, and demodulates and decodes the received signal according to an instruction from the control unit 405. When the reception processing unit 401 detects a PDCCH (first PDCCH, second PDCCH) signal addressed to itself, the reception processing unit 401 outputs DCI obtained by decoding the PDCCH signal to the control unit 405. For example, the reception processing unit 401 performs a process of detecting the second PDCCH addressed to itself in the Search Space in the second PDCCH region designated by the base station device 3. For example, the reception processing unit 401 performs a process of setting a Search space for an eCCE aggregation number candidate and detecting a second PDCCH addressed to the own apparatus. For example, the reception processing unit 401 estimates a propagation path using the UE-specific RS in the second PDCCH region designated by the base station device 3, demodulates the signal of the second PDCCH, A process for detecting a signal including the control information addressed thereto is performed. For example, the reception processing unit 401 demodulates the signal of the second PDCCH using eCCE constituting the ePDCCH cadidate for performing the detection process or UE-specific RS of the antenna port corresponding to eREG.

  In addition, the reception processing unit 401 receives, via the control unit 405, information data obtained by decoding the PDSCH addressed to itself based on an instruction from the control unit 405 after outputting the DCI included in the PDCCH to the control unit 405. To the upper layer. In the DCI included in the PDCCH, 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 indicates information indicating the DL PRB pair of the second PDCCH region, and information indicating the eCCE resource mapping method of the second PDCCH region. Contains information.

  Also, the reception processing unit 401 outputs information indicating the resource mapping method of the detected second PDCCH and information (eCCE index) indicating the CCE constituting the detected second PDCCH to the control unit 405.

  Further, the reception processing unit 401 outputs a cyclic redundancy check (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 generator polynomial determined in advance in the mobile station device 5 is the same as the CRC code generated in the base station device 3 and transmitted on the PDSCH, the data is correct. If the information generated from the data using the generator polynomial determined in advance in the mobile station apparatus 5 is different from the CRC code generated in the base station apparatus 3 and transmitted on the PDSCH, the data is incorrect. It is judged.

  Further, the reception processing unit 401 measures downlink reception quality (RSRP: Reference Signal Received Power) and outputs the measurement result to the control unit 405. The reception processing unit 401 measures (calculates) RSRP from CRS or CSI-RS based on an instruction from the control unit 405. Details of the reception processing unit 401 will be described later.

  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 processing for detecting the second PDCCH on the signal in the DL PRB pair of the second PDCCH region instructed by the radio resource control unit 403. . For example, the control unit 405 performs demapping of the eCCE resource of the second PDCCH region based on information indicating the eCCE resource mapping method of the second PDCCH region instructed from the radio resource control unit 403. The reception processing unit 401 is controlled. Here, the demapping of eCCE resources in the second PDCCH region is, for example, configured as a second PDCCH candidate that performs detection processing from a signal in the second PDCCH region, as shown in FIGS. It means the process of (formation, construction, creation). In addition, the control unit 405 controls the reception processing unit 401 in an area in which the process for detecting the second PDCCH in the second PDCCH area is performed. Specifically, the control unit 405 executes, for each second PDCCH region, an eCCE aggregation number for setting a search space, and a process for detecting the second PDCCH in the second PDCCH region. The PDCCH candidates are instructed (set) to the reception processing unit 401 for each eCCE aggregation number. In addition, the control unit 405 controls the reception processing unit 401 to use the UE-specific RS of the antenna port corresponding to the demodulation of each eCCE signal.

  The control unit 405 is based on the information indicating the resource mapping method of the detected second PDCCH and the information (eCCE index) indicating the eCCE in which the second PDCCH is detected, input from the reception processing unit 401. The transmission processing unit 407 is controlled by determining and selecting an ACK / NACK PUCCH resource (PUCCH resource index) for transmitting ACK / NACK for the PDSCH to which resources are allocated by the second PDCCH. As described above, the control unit 405 recognizes different rules for association between eCCE and ACK / NACK PUCCH resources for eCCE to which localized mapping is applied and eCCE to which distributed mapping is applied. Yes.

  Further, the control unit 405 controls the reception processing unit 401 and the transmission processing unit 407 based on DCI transmitted from the base station apparatus 3 using the PDCCH 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. Also, 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. Further, the control unit 405 controls the transmission processing unit 407 so as to transmit information indicating the downlink reception quality (RSRP) input from the reception processing unit 401.

  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 holds information regarding the DL PRB pair of the second PDCCH region and information regarding the eCCE resource mapping method of the second PDCCH region, and outputs various control signals to the control unit 405. 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.

  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 mobile-station device-specific parameters previously notified from the base station device 3, and modulation used for the PUSCH Values such as a parameter based on the method, a parameter based on the estimated path loss value, and a parameter based on the transmission power control command notified from the base station apparatus 3 are set. Radio resource control unit 403, for PUCCH, parameters based on the signal configuration of PUCCH, cell-specific and mobile station device-specific parameters previously notified from base station device 3, parameters based on estimated path loss values, A value such as a parameter based on the notified transmission power control command is set.

  As parameters related to transmission power, parameters specific to cells and mobile station apparatuses are notified from the base station apparatus 3 using the PDSCH, and transmission power control commands are notified from the base station apparatus 3 using the PDCCH. . 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 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 in accordance with instructions from the control unit 405. 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 Mobile Station Device 5>
Hereinafter, details of the reception processing unit 401 of the mobile station apparatus 5 will be described. FIG. 5 is a schematic block diagram showing the configuration of the reception processing unit 401 of the mobile station apparatus 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, PDSCH channel compensation unit 515, physical downlink shared channel decoding unit 517, PDCCH channel compensation unit 519, physical downlink control channel decoding unit 521, downlink reception quality measurement unit 531, and PDCCH demapping unit 533 It is comprised including. Further, as shown in this figure, the physical downlink shared channel decoding unit 517 includes a data demodulation unit 523 and a turbo decoding unit 525. Also, as shown in this figure, the physical downlink 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 so that the signal level is properly 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 a PDCCH (first PDCCH, second PDCCH) 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 PDSCH propagation path compensation unit 515 and outputs the separated PDCCH signal to the PDCCH propagation path compensation unit 519. For example, the demultiplexing unit 511 outputs the second PDCCH signal in the second PDCCH region designated by the own device to the PDCCH channel compensation unit 519. In addition, the demultiplexing unit 511 demultiplexes the downlink resource element in which the downlink reference signal is arranged, and outputs the downlink reference signal (CRS, UE-specific RS) to the propagation path estimation unit 513. For example, the demultiplexing unit 511 outputs the UE-specific RS of the second PDCCH region designated by the own device to the propagation path estimation unit 513. Further, the demultiplexing unit 511 outputs the downlink reference signal (CRS, CSI-RS) to the downlink reception quality measuring unit 531.

  The propagation path estimation unit 513 estimates the propagation path variation using the downlink reference signal and the known signal separated by the demultiplexing unit 511, and adjusts the amplitude and phase so as to compensate for the propagation path variation. For this purpose are output to the PDSCH propagation compensation unit 515 and the PDCCH propagation compensation unit 519. The propagation path estimation unit 513 estimates propagation path fluctuations independently using CRS and UE-specific RS, and outputs a propagation path compensation value. For example, the propagation path estimation unit 513 obtains the propagation path compensation value from the propagation path estimation value estimated using UE-specific RSs arranged in a plurality of DL PRB pairs in the second PDCCH region designated by the own apparatus. And output to the propagation path compensation unit 519 for PDCCH. In addition, the propagation path estimation part 513 performs propagation path estimation and the production | generation of a propagation path compensation value using UE-specific RS for every one or more antenna ports designated from the control part 405. FIG. For example, the propagation path estimation unit 513 generates a propagation path compensation value from the propagation path estimation value estimated using UE-specific RSs allocated to a plurality of DL PRB pairs allocated to the own device and allocated to the PDSCH. , Output to PDSCH propagation path compensation unit 515. For example, the propagation path estimation unit 513 generates a propagation path compensation value from the propagation path estimation value estimated using CRS, and outputs the propagation path compensation value to the PDCCH propagation path compensation unit 519. For example, the propagation path estimation unit 513 generates a propagation path compensation value from the propagation path estimation value estimated using CRS, and outputs the propagation path compensation value to the PDSCH propagation path compensation unit 515.

  PDSCH 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. For example, the PDSCH channel compensation unit 515 adjusts a certain PDSCH signal according to the channel compensation value generated based on the UE-specific RS by the channel estimation unit 513, and performs different PDSCH signals. The propagation path estimation unit 513 performs adjustment according to the propagation path compensation value generated based on the CRS. PDSCH propagation path compensation section 515 outputs the signal whose propagation path has been adjusted to data demodulation section 523 of physical downlink shared channel decoding section 517.

  Based on an instruction from the control unit 405, the physical downlink 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.

  PDCCH propagation path compensation section 519 adjusts the amplitude and phase of the PDCCH signal separated by demultiplexing section 511 according to the propagation path compensation value input from propagation path estimation section 513. For example, the channel compensation unit 519 for PDCCH adjusts the second PDCCH signal according to the channel compensation value generated based on the UE-specific RS by the channel estimation unit 513, and performs the first PDCCH signal transmission. The signal is adjusted according to the channel compensation value generated based on the CRS by the channel estimation unit 513 for the signal. For example, the PDCCH channel compensation unit 519 adjusts the eCCE signal according to the channel compensation value generated based on the UE-specific RS of the antenna port corresponding to the eCCE. For example, the channel compensation unit 519 for PDCCH adjusts the eCCE signal according to the channel compensation value generated based on the UE-specific RS of the antenna port corresponding to the eREG constituting the eCCE. PDCCH propagation path compensation section 519 outputs the adjusted signal to PDCCH demapping section 533.

  The PDCCH demapping unit 533 performs first PDCCH demapping or second PDCCH demapping on the signal input from the PDCCH channel compensation unit 519. Further, the PDCCH demapping unit 533 performs demapping for localized mapping or demapping for distributed mapping on the second PDCCH signal input from the PDCCH channel compensation unit 519. The PDCCH demapping unit 533 will be described with reference to FIG. 17 so that the physical downlink control channel decoding unit 521 processes the input first PDCCH signal in units of CCEs shown in FIG. As described above, the input first PDCCH signal is converted to a CCE unit signal. The PDCCH demapping unit 533 receives the input second PDCCH signal so that the physical downlink control channel decoding unit 521 performs processing in units of eCCEs illustrated in FIG. 19. The PDCCH signal is converted into an eCCE unit signal. The PDCCH demapping unit 533 converts the input second PDCCH signal in the second PDCCH region to which the localized mapping is applied, into an eCCE unit signal, as described with reference to FIG. The PDCCH demapping unit 533 converts the input second PDCCH signal in the second PDCCH region to which the distributed mapping is applied, into a signal in units of eCCE as described with reference to FIG. PDCCH demapping section 533 outputs the converted signal to QPSK demodulation section 527 of physical downlink control channel decoding section 521.

  The physical downlink control channel decoding unit 521 demodulates and decodes the signal input from the PDCCH channel compensation unit 519 as described below, and detects control data. The QPSK demodulator 527 performs QPSK demodulation on the PDCCH signal and outputs the result to the Viterbi decoder 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. Note that when the physical downlink control channel decoding unit 521 outputs the detected control data to the control unit 405, information indicating an eCCE resource mapping method applied to the second PDCCH in which the control data is detected, eCCE Is also output to the control unit 405.

  First, the detection process for the first PDCCH will be described. The mobile station apparatus 5 performs a process of detecting DCI addressed to itself, assuming a plurality of CCE aggregation numbers. The mobile station apparatus 5 performs different decoding processing on the first PDCCH signal for each assumed CCE aggregation number (coding rate), and there is an error in the CRC code added to the first PDCCH together with DCI. DCI included in the first PDCCH that has not been detected is acquired. Such a process is called blind decoding. Note that the mobile station apparatus 5 does not perform blind decoding assuming the first PDCCH for all CCE (REG) signals (received signals) in the downlink system band, but for some CCEs. Only perform blind decoding. A part of CCEs (CCEs) on which blind decoding is performed is referred to as a search space (search space for the first PDCCH). In addition, a different search space (search space for the first PDCCH) is defined for each CCE aggregation number. In the communication system 1 according to the embodiment of the present invention, different search spaces (search spaces for the first PDCCH) are set in the mobile station device 5 for the first PDCCH. Here, the search space for the first PDCCH of each mobile station apparatus 5 (the search space for the first PDCCH) may be configured by completely different CCEs (CCEs) or by the same CCEs (CCEs). It may be configured by CCEs (CCEs) partially overlapping.

  Next, the detection process for the second PDCCH will be described. The mobile station apparatus 5 performs a process of detecting DCI addressed to the own apparatus assuming a plurality of eCCE aggregation numbers. The mobile station apparatus 5 performs a different decoding process on the second PDCCH signal for each assumed eCCE aggregation number (coding rate), and there is an error in the CRC code added to the second PDCCH together with the DCI. The DCI included in the second PDCCH that has not been detected is acquired. Such a process is called blind decoding. The mobile station apparatus 5 does not perform blind decoding assuming the second PDCCH for all eCCE signals (received signals) in the second PDCCH area configured from the base station apparatus 3, Blind decoding may be performed only for some eCCEs. Some eCCEs (eCCEs) on which blind decoding is performed are referred to as Search spaces (Search spaces for the second PDCCH). In addition, a different search space (search space for the second PDCCH) is defined for each eCCE aggregation number. In the mobile station apparatus 5 in which a plurality of second PDCCH regions are configured, a search space is set (configured and defined) in each configured second PDCCH region. For example, the mobile station device 5 sets a search space for each of a second PDCCH region to which distributed mapping is applied and a second PDCCH region to which localized mapping is applied. In the mobile station apparatus 5 in which a plurality of second PDCCH regions are configured, a plurality of Search spaces are set simultaneously in a certain downlink subframe.

  In the communication system 1 according to the embodiment of the present invention, a plurality of different search spaces (second PDCCH search spaces) are set in the mobile station apparatus 5 for the second PDCCH. Here, the search space (search space for the second PDCCH) for the second PDCCH of each mobile station apparatus 5 in which the same second PDCCH region is configured may be configured by completely different eCCEs (eCCEs). And it may be comprised by the completely same eCCE (eCCEs), and may be comprised by eCCE (eCCEs) which a part overlaps.

  In mobile station apparatus 5 in which a plurality of second PDCCH regions are configured, a search space (search space for the second PDCCH) is set in each second PDCCH region. The search space (search space for the second PDCCH) means a logical area in which the mobile station apparatus 5 performs decoding detection of the second PDCCH in the second PDCCH area. The Search space (Search space for the second PDCCH) is composed of a plurality of second PDCCH candidates. The second PDCCH candidate is a target on which the mobile station apparatus 5 performs decoding detection of the second PDCCH. For each eCCE aggregation number, different second PDCCH candidates are composed of different eCCEs (including one eCCE and a plurality of eCCEs). For example, the base station apparatus 3 notifies the mobile station apparatus 5 of the eCCE or the second PDCCH candidate used for the search space (search space for the second PDCCH) using RRC signaling.

  In each search space of the plurality of second PDCCH regions, the number of candidates for the second PDCCH may be different. In addition, in a certain number of eCCE sets, the number of second PDCCH candidates in the search space in each second PDCCH region is the same, and in a different number of eCCE sets, the second number in the search space in each second PDCCH region. The number of PDCCH candidates may be different. In addition, the second PDCCH candidates for a certain number of eCCE sets may be set in the search space of one second PDCCH region, and may not be set in the search space of another second PDCCH region. Further, the number of second PDCCH candidates in the search space in one second PDCCH region may be changed according to the number of second PDCCH regions configured in the mobile station device 5.

  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 demodulator 523, a turbo decoder 525, and a transmission processor 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 also included in the PDCCH as in the PDSCH, and the control unit 405 determines whether or not the DCI of the PDCCH is incorrect using the CRC code.

  The downlink reception quality measurement unit 531 measures the downlink reception quality (RSRP) of the cell using the downlink reference signal (CRS, CSI-RS), and sends the measured downlink reception quality information to the control unit 405. Output. The downlink reception quality measurement unit 531 also performs instantaneous channel quality measurement for generating CQI to be notified to the base station apparatus 3 in the mobile station apparatus 5. The downlink reception quality measurement unit 531 outputs information such as the measured RSRP to the control unit 405.

<Transmission Processing Unit 407 of Mobile Station Device 5>
FIG. 6 is a schematic block diagram showing the configuration of the transmission processing unit 407 of the mobile station apparatus 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 pilot channel 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 performs coding and modulation on information data 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. On the other hand, the physical uplink control channel processing unit 619 implements frequency domain code multiplexing for PUCCH signals generated from ACK / NACK information bits, SR information bits, or CQI information bits. The code sequence instructed by the control unit 405 is multiplied. 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 pilot channel processing section 617 generates SRS and DM RS, which are known signals in base station apparatus 3, based on instructions from control section 405, and outputs them to subcarrier mapping section 621.

  The subcarrier mapping unit 621 converts the signal input from the uplink pilot channel processing unit 617, the signal input from the DFT unit 615, and the signal input from the physical uplink control channel processing unit 619 into 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 of IFFT section 623 is larger than the number of points of DFT section 615, and mobile station apparatus 5 transmits using PUSCH 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.

  FIG. 7 is a flowchart showing an example of processing related to selection of ACK / NACK PUCCH resources of the mobile station apparatus 5 according to the embodiment of the present invention. The mobile station device 5 determines whether or not the second PDCCH addressed to itself is detected (step S101). If the mobile station apparatus 5 determines that the second PDCCH addressed to itself is detected (step S101: YES), the mobile station apparatus 5 determines a resource mapping method applied to the detected second PDCCH (step S102). . Next, the mobile station apparatus 5 determines the detected eCCE that constitutes the second PDCCH (step S103). Next, the mobile station apparatus 5 transmits a signal including ACK / NACK information based on the determined resource mapping method applied to the second PDCCH and the eCCE constituting the second PDCCH. ACK / NACK PUCCH resources to be used are selected (step S104). Here, the mobile station apparatus 5 uses different rules depending on the resource mapping method applied to the second PDCCH. If it is determined that the second PDCCH addressed to the mobile station device 5 is not detected (step S101: NO), the mobile station device 5 performs a process of selecting an ACK / NACK PUCCH resource for the corresponding uplink subframe. Not performed.

  FIG. 8 is a flowchart showing an example of processing related to selection of ACK / NACK PUCCH resources of the base station apparatus 3 according to the embodiment of the present invention. The base station apparatus 3 selects the eCCE resource mapping method to be applied to the second PDCCH to be transmitted to the mobile station apparatus 5 (step T101). Next, the base station device 3 selects an eCCE that constitutes the second PDCH (step T102). Next, the base station apparatus 3 selects an eCCE resource mapping method applied to the selected second PDCCH and an ACK / NACK PUCCH resource received from the mobile station apparatus 5 based on the selected eCCE (step) T103).

  As described above, in the embodiment of the present invention, in the communication system 1, the downlink control channel region (second PDCCH) (region in which the downlink control channel (second PDCCH) (ePDCCH) may be arranged) A plurality of physical resource block pairs (DL PRB pairs) are configured as (PDCCH region) (ePDCCH region) (ePDCCH set), and one physical resource block pair (DL PRB pair) is divided into a plurality (for example, 16) A first element (eREG) is configured from a resource, and a set of a plurality of (for example, four) first elements (eREGs) in one physical resource block pair (DL PRB pair) (Localized mapping eCCE), Or multiple (for example, 4) physical resource blocks A second element (eCCE) is configured from a set (e.g., eCCE of distributed mapping) of a plurality of (for example, four) first elements (eREGs) in a pair (DL PRB pair), and a downlink control channel (second PDCCH) is composed of a set of one or more second elements (eCCE) (for example, a set of 1, 2, 4, and 8), and the uplink control channel (PUCCH) resource is the second. The base station device 3 sets a plurality of downlink control channel regions (second PDCCH regions), and the base station device 3 configures the downlink control channel region (second PDCCH region). ) Of the second control element (eCCE) and the uplink control channel resource (PUCCH resource offset) to be started Information set in the downlink control channel region (second PDCCH region), the base station device 3 transmits the set information to the mobile station device 5, and the mobile station device 5 receives the information received from the base station device 3. A plurality of downlink control channel regions (second PDCCH regions) are set based on the information, and the mobile station device 5 sets the second downlink control channel region (second PDCCH region) based on the information received from the base station device 3. Is set for each downlink control channel region (second PDCCH region) in which the resource (PUCCH resource offset) of the uplink control channel for which the association (eCCE) is started is set. The mobile station apparatus 5 includes an identification number (eCCE index) of one or more second elements (eCCE) constituting the downlink control channel (second PDCCH) including information on resource allocation of the downlink shared channel (PDSCH). ) And the second control element (eCCE) of the downlink control channel area (second PDCCH area) in which the downlink control channel (second PDCCH) is detected. ) Resources (PUCCH resource offsets), the uplink control channel (PUCCH) resources used to transmit the acknowledgment (ACK / NACK) for the received downlink shared channel (PDSCH) data (transport block) Identification number (PUCCH resource in To determine the ex).

  As described above, in the embodiment of the present invention, in the communication system 1, the downlink control channel region (second PDCCH) (region in which the downlink control channel (second PDCCH) (ePDCCH) may be arranged) A plurality of physical resource block pairs (DL PRB pairs) are configured as (PDCCH region) (ePDCCH region) (ePDCCH set), and a first element from a resource obtained by dividing one physical resource block pair (DL PRB pair) into a plurality of (EREG) is configured, a second element (eCCE) is configured from a set of a plurality of (for example, four) first elements (eREG), and one or more downlink control channels (second PDCCH) are included Is composed of a set of second elements (eCCEs) (eg 1, 2, 4, 8 sets) As a mapping method of the first element (eREG) applied to the second element (eCCE), a plurality of (for example, four) first elements (for example, four) in one physical resource block pair (DL PRB pair) ( a first mapping method (Localized mapping) in which one second element (eCCE) is configured from a set of eREGs, or a plurality (for example, four) of physical resource block pairs (DL PRB pairs) ( For example, any one of the second mapping methods (Distributed mapping) in which one second element (eCCE) is configured from a set of four first elements (eREGs) is determined by the downlink control channel (second Applied to PDCCH) and uplink control channel (PUCCH) resource (PUCCH resource) ce) corresponds to each of the second elements (eCCE), and the first mapping method (Localized) is associated with the association between the uplink control channel (PUCCH) resource (PUCCH resource) and the second element (eCCE). Different mapping rules are used when mapping is applied and when the second mapping method is applied, and the base station apparatus 3 uses the downlink control used for the mobile station apparatus 5. One or more configuring a downlink control channel (second PDCCH) by setting a first mapping method (Localized mapping) or a second mapping method (Distributed mapping) to a channel (second PDCCH) Second element (e CCE) and mobile station apparatus based on mapping method of first element (eREG) applied to set second element (eCCE) and one or more set second elements (eCCE) 5 sets the resource (PUCCH resource) of the uplink control channel (PUCCH) received from 5, and the base station apparatus 3 sends a signal to the mobile station apparatus 5 using the set downlink control channel (second PDCCH). The base station apparatus 3 receives the signal from the mobile station apparatus 5 using the configured uplink control channel (PUCCH) resource (PUCCH resource), and the mobile station apparatus 5 receives the downlink control channel addressed to itself. (Second PDCCH) detection processing (Blind decoding) is performed, and the detected downlink control channel (second PDCCH) One or more of the first element (eREG) mapping method applied to the second element (eCCE) applied to the PDCCH) and configuring the detected downlink control channel (second PDCCH) The mobile station apparatus 5 detects the second element (eCCE), and the mobile station apparatus 5 applies the first element (eREG) applied to the second element (eCCE) applied to the detected downlink control channel (second PDCCH). Of the uplink control channel (PUCCH) to be transmitted to the base station apparatus 3 based on the mapping method and one or more second elements (eCCE) constituting the downlink control channel (second PDCCH) ( PUCCH resource) is selected, and the mobile station apparatus 5 selects the uplink control channel (PUCCH) resource (PUCCH resource). It transmits a signal to the base station apparatus 3 using.

  Further, in the communication system 1, the uplink control channel (PUCCH) is used for transmission / reception of an acknowledgment response (ACK / NACK), and the acknowledgment response (ACK / NACK) is transmitted by the downlink control channel (second PDCCH). This is a reception acknowledgment (ACK / NACK) for downlink shared channel (PDSCH) data indicating resource allocation information. Furthermore, in the communication system 1, the resource (PUCCH resource) of the uplink control channel (PUCCH) to which the second element (eCCE) of the second mapping method (Distributed mapping) corresponds is the second element (eCCE). Uplink control channel (PUCCH) corresponding to any of the plurality of second elements (eCCE) of the first mapping method (Localized mapping) configured using any of the plurality of first elements (eREG) to be configured ) Resource (PUCCH resource). Further, in the communication system 1, a plurality of uplinks corresponding to a second element (eCCE) of a plurality of first mapping methods (Localized mapping) in one downlink control channel region (second PDCCH region). Multiple uplink control channel (PUCCH) resources (PUCCH resource) to which the control channel (PUCCH) resource (PUCCH resource) and the second element (eCCE) of the plurality of second mapping methods (Distributed mapping) correspond Are composed of a plurality of common resources.

  As a result, a common ACK / NACK PUCCH resource can be reserved for the localized ePDCCH and the distributed ePDCCH in the second PDCCH region, so that an increase in overhead can be avoided and assigned in a certain downlink subframe. Further, since it is possible to avoid collision of ACK / NACK PUCCH resources for the respective second PDCCHs, the complexity of the scheduler of the base station apparatus 3 is reduced. In the embodiment of the present application, it is not necessary to transmit / receive information for avoiding collision of ACK / NACK PUCCH resources with downlink control information, and an increase in downlink overhead can be avoided.

  In the embodiment of the present invention, for simplification of description, the resource region where the second PDCCH may be arranged is defined as the second PDCCH region, but a different wording (for example, ePDCCH set). However, it is obvious that the present invention can be applied if it has a similar meaning.

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

  The characteristic means of the present invention described above can also be realized by mounting and controlling functions in an integrated circuit. That is, in the integrated circuit of the present invention, a plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a plurality of one physical resource block pair is formed. A first element is composed of resources divided into two, a second element is composed of a plurality of sets of the first elements, and a downlink control channel is composed of a set of one or more second elements. As the first element mapping method applied to the second element, one second element is configured from a set of a plurality of the first elements in one physical resource block pair. A first mapping method, or a second macro in which one second element is configured from a plurality of the first element sets in the plurality of physical resource block pairs. Any of the ping methods is applied to the downlink control channel, the resources of the uplink control channel correspond to the respective second elements, and the base station apparatus, the downlink control channel, and the uplink control channel are used. An integrated circuit mounted on a mobile station apparatus that performs communication, and the first mapping method is applied to the second control element in association with the uplink control channel resource and the second element. Different mapping rules are used when the mapping method is applied, processing for detecting a downlink control channel addressed to the own device is performed, and applied to the detected second element applied to the downlink control channel And detecting one or more second elements constituting the detected downlink control channel. A first reception processing unit, a first element mapping method applied to a second element applied to the downlink control channel detected by the first reception processing unit, and the downlink control A first control unit that selects an uplink control channel resource to be transmitted to the base station device based on one or more second elements constituting a channel; and the first control unit that is selected by the first control unit And a first transmission processing unit that transmits a signal to the base station apparatus using an uplink control channel resource.

  In the integrated circuit of the present invention, a plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a plurality of one physical resource block pair is provided. A first element is composed of resources divided into two, a second element is composed of a plurality of sets of the first elements, and a downlink control channel is composed of a set of one or more second elements. As the first element mapping method applied to the second element, one second element is configured from a set of a plurality of the first elements in one physical resource block pair. A first mapping method, or a second mapping in which one second element is configured from a plurality of the first element sets in the plurality of physical resource block pairs. Any of the transmission methods is applied to the downlink control channel, and the uplink control channel resource corresponds to each of the second elements, and a plurality of mobile station apparatuses, the downlink control channel, and the uplink control channel When the first mapping method is applied to the association between the uplink control channel resource and the second element, the integrated circuit is implemented in a base station apparatus that performs communication using Different mapping rules are used when the second mapping method is applied, and the first mapping method or the second mapping method is used for the downlink control channel used for the mobile station apparatus. Set, set one or more second elements constituting the downlink control channel, and apply first elements applied to the set second elements A second radio resource control unit configured to set an uplink control channel resource received from the mobile station apparatus based on the mapping method and one or more set second elements, and the second radio resource control A second transmission processing unit configured to transmit a signal to the mobile station apparatus using the downlink control channel set by a unit, and the uplink control channel set by the second radio resource control unit. And a second reception processing unit that receives a signal from the mobile station apparatus using a resource.

  The operations described in the embodiments of the present invention may be realized by a program. The program that operates in the mobile station 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 mobile station apparatus 5 and the base station apparatus 3 in embodiment mentioned above as LSI which is typically an integrated circuit. Each functional block of the mobile station 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 mobile station 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 mobile station device (user terminal). Or a processor and a recording medium may exist in the mobile station apparatus 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) mobile station apparatus 101 reception processing unit 103 radio resource control unit 105 control unit 107 transmission processing unit 109 reception antenna 111 transmission antenna 201 physical downlink shared channel processing unit 203 physical downlink control channel processing unit 205 downlink Pilot channel processing section 207 Multiplexing section 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 PDCCH)
229 Precoding processing unit (for PDSCH)
231 Precoding processing unit (for downlink pilot channel)
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 Physical downlink shared channel decoding unit 519 Propagation channel compensation unit (for PDCCH)
521 Physical downlink control channel decoding unit 523 Data demodulation unit 525 Turbo decoding unit 527 QPSK demodulation unit 529 Viterbi decoder unit 531 Downlink reception quality measurement unit 533 PDCCH demapping unit 605 D / A unit 607 Transmission RF unit 611 Turbo coding unit 613 Data modulation unit 615 DFT unit 617 Uplink pilot channel 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 (13)

A plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a first element from a resource obtained by dividing one physical resource block pair into a plurality And the second element is composed of a plurality of sets of the first elements, and the downlink control channel is composed of one or more sets of the second elements and applied to the second elements. As the first element mapping method, a first mapping method in which one second element is configured from a set of a plurality of first elements in one physical resource block pair, or a plurality of mapping methods One of the second mapping methods in which one second element is configured from a set of the plurality of first elements in the physical resource block pair is the downlink. A plurality of mobile station apparatuses, a plurality of mobile station apparatuses, the downlink control channel, and the uplink control channel. A communication system composed of base station devices that perform communication using
Regarding the association between the uplink control channel resource and the second element, different association rules are used when the first mapping method is applied and when the second mapping method is applied. ,
The base station device
The first mapping method or the second mapping method is set for the downlink control channel used for the mobile station apparatus, and one or more second elements constituting the downlink control channel are set. Based on the first element mapping method applied to the set second element and the set one or more second elements, the uplink control channel resource received from the mobile station apparatus is set. A second radio resource control unit,
A second transmission processing unit for transmitting a signal to the mobile station apparatus using the downlink control channel set by the second radio resource control unit;
A second reception processing unit that receives a signal from the mobile station apparatus using the uplink control channel resource set by the second radio resource control unit,
The mobile station device
Performs processing for detecting a downlink control channel addressed to the own apparatus, detects a first element mapping method applied to the second element applied to the detected downlink control channel, and detects the detected downlink A first reception processing unit for detecting one or more second elements constituting the control channel;
A mapping method of a first element applied to a second element applied to the downlink control channel detected by the first reception processing unit, and one or more first elements constituting the downlink control channel; A first control unit that selects an uplink control channel resource to be transmitted to the base station device based on two elements;
A first transmission processing unit configured to transmit a signal to the base station apparatus using the resource of the uplink control channel selected by the first control unit.   The uplink control channel is used for transmission / reception of a reception confirmation response, and the reception confirmation response is a reception confirmation response to data of a downlink shared channel in which resource allocation information is indicated by the downlink control channel. The communication system according to claim 1.   The resource of the uplink control channel to which the second element of the second mapping method corresponds is the first mapping configured using any one of the plurality of first elements constituting the second element The communication system according to claim 2, wherein the communication resource is an uplink control channel resource corresponding to any one of a plurality of second elements of the method.   A plurality of uplink control channel resources corresponding to a plurality of second elements of the first mapping method in one downlink control channel region, and a second element of the plurality of second mapping methods 4. The communication system according to claim 3, wherein the resources of a plurality of uplink control channels corresponding to are configured from a plurality of common resources. A plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a first element from a resource obtained by dividing one physical resource block pair into a plurality And the second element is composed of a plurality of sets of the first elements, and the downlink control channel is composed of one or more sets of the second elements and applied to the second elements. As the first element mapping method, a first mapping method in which one second element is configured from a set of a plurality of first elements in one physical resource block pair, or a plurality of mapping methods One of the second mapping methods in which one second element is configured from a set of the plurality of first elements in the physical resource block pair is the downlink. A mobile station apparatus that is applied to a link control channel, the uplink control channel resource corresponds to each of the second elements, and performs communication using the base station apparatus, the downlink control channel, and the uplink control channel. There,
Regarding the association between the uplink control channel resource and the second element, different association rules are used when the first mapping method is applied and when the second mapping method is applied. ,
Performs processing for detecting a downlink control channel addressed to the own apparatus, detects a first element mapping method applied to the second element applied to the detected downlink control channel, and detects the detected downlink A first reception processing unit for detecting one or more second elements constituting the control channel;
A mapping method of a first element applied to a second element applied to the downlink control channel detected by the first reception processing unit, and one or more first elements constituting the downlink control channel; A first control unit that selects an uplink control channel resource to be transmitted to the base station device based on two elements;
A mobile station apparatus comprising: a first transmission processing unit that transmits a signal to the base station apparatus using a resource of the uplink control channel selected by the first control unit.   The uplink control channel is used for transmission / reception of a reception confirmation response, and the reception confirmation response is a reception confirmation response to data of a downlink shared channel in which resource allocation information is indicated by the downlink control channel. The mobile station apparatus according to claim 5.   The resource of the uplink control channel to which the second element of the second mapping method corresponds is the first mapping configured using any one of the plurality of first elements constituting the second element The mobile station apparatus according to claim 6, wherein the mobile station apparatus is an uplink control channel resource corresponding to any one of a plurality of second elements of the method.   A plurality of uplink control channel resources corresponding to a plurality of second elements of the first mapping method in one downlink control channel region, and a second element of the plurality of second mapping methods The mobile station apparatus according to claim 7, wherein the resources of a plurality of uplink control channels corresponding to are configured from a plurality of common resources. A plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a first element from a resource obtained by dividing one physical resource block pair into a plurality And the second element is composed of a plurality of sets of the first elements, and the downlink control channel is composed of one or more sets of the second elements and applied to the second elements. As the first element mapping method, a first mapping method in which one second element is configured from a set of a plurality of first elements in one physical resource block pair, or a plurality of mapping methods One of the second mapping methods in which one second element is configured from a set of the plurality of first elements in the physical resource block pair is the downlink. A base station that is applied to a link control channel, the uplink control channel resource corresponds to each of the second elements, and performs communication using a plurality of mobile station apparatuses, the downlink control channel, and the uplink control channel A device,
Regarding the association between the uplink control channel resource and the second element, different association rules are used when the first mapping method is applied and when the second mapping method is applied. ,
The first mapping method or the second mapping method is set for the downlink control channel used for the mobile station apparatus, and one or more second elements constituting the downlink control channel are set. Based on the first element mapping method applied to the set second element and the set one or more second elements, the uplink control channel resource received from the mobile station apparatus is set. A second radio resource control unit,
A second transmission processing unit for transmitting a signal to the mobile station apparatus using the downlink control channel set by the second radio resource control unit;
A base station apparatus comprising: a second reception processing unit configured to receive a signal from the mobile station apparatus using the uplink control channel resource set by the second radio resource control unit. A plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a first element from a resource obtained by dividing one physical resource block pair into a plurality And the second element is composed of a plurality of sets of the first elements, and the downlink control channel is composed of one or more sets of the second elements and applied to the second elements. As the first element mapping method, a first mapping method in which one second element is configured from a set of a plurality of first elements in one physical resource block pair, or a plurality of mapping methods One of the second mapping methods in which one second element is configured from a set of the plurality of first elements in the physical resource block pair is the downlink. To a mobile station apparatus that is applied to a link control channel, the uplink control channel resource corresponds to each of the second elements, and performs communication using the base station apparatus, the downlink control channel, and the uplink control channel. A communication method used,
Regarding the association between the uplink control channel resource and the second element, different association rules are used when the first mapping method is applied and when the second mapping method is applied. ,
Performs processing for detecting a downlink control channel addressed to the own apparatus, detects a first element mapping method applied to the second element applied to the detected downlink control channel, and detects the detected downlink Detecting one or more second elements comprising a control channel;
Based on the first element mapping method applied to the detected second element applied to the downlink control channel, and one or more second elements constituting the downlink control channel, Selecting an uplink control channel resource to be transmitted to the base station apparatus;
And a step of transmitting a signal to the base station apparatus using the resource of the selected uplink control channel. A plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a first element from a resource obtained by dividing one physical resource block pair into a plurality And the second element is composed of a plurality of sets of the first elements, and the downlink control channel is composed of one or more sets of the second elements and applied to the second elements. As the first element mapping method, a first mapping method in which one second element is configured from a set of a plurality of first elements in one physical resource block pair, or a plurality of mapping methods One of the second mapping methods in which one second element is configured from a set of the plurality of first elements in the physical resource block pair is the downlink. A base station that is applied to a link control channel, the uplink control channel resource corresponds to each of the second elements, and performs communication using a plurality of mobile station apparatuses, the downlink control channel, and the uplink control channel A communication method used in an apparatus,
Regarding the association between the uplink control channel resource and the second element, different association rules are used when the first mapping method is applied and when the second mapping method is applied. ,
The first mapping method or the second mapping method is set for the downlink control channel used for the mobile station apparatus, and one or more second elements constituting the downlink control channel are set. Based on the first element mapping method applied to the set second element and the set one or more second elements, the uplink control channel resource received from the mobile station apparatus is set. And steps to
Transmitting a signal to the mobile station apparatus using the set downlink control channel;
Receiving at least one signal from the mobile station apparatus using the configured uplink control channel resource. A plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a first element from a resource obtained by dividing one physical resource block pair into a plurality And the second element is composed of a plurality of sets of the first elements, and the downlink control channel is composed of one or more sets of the second elements and applied to the second elements. As the first element mapping method, a first mapping method in which one second element is configured from a set of a plurality of first elements in one physical resource block pair, or a plurality of mapping methods One of the second mapping methods in which one second element is configured from a set of the plurality of first elements in the physical resource block pair is the downlink. To a mobile station apparatus that is applied to a link control channel, the uplink control channel resource corresponds to each of the second elements, and performs communication using the base station apparatus, the downlink control channel, and the uplink control channel. An integrated circuit to be mounted,
Regarding the association between the uplink control channel resource and the second element, different association rules are used when the first mapping method is applied and when the second mapping method is applied. ,
Performs processing for detecting a downlink control channel addressed to the own apparatus, detects a first element mapping method applied to the second element applied to the detected downlink control channel, and detects the detected downlink A first reception processing unit for detecting one or more second elements constituting the control channel;
A mapping method of a first element applied to a second element applied to the downlink control channel detected by the first reception processing unit, and one or more first elements constituting the downlink control channel; A first control unit that selects an uplink control channel resource to be transmitted to the base station device based on two elements;
An integrated circuit comprising: a first transmission processing unit configured to transmit a signal to the base station apparatus using the uplink control channel resource selected by the first control unit. A plurality of physical resource block pairs are configured as a downlink control channel region, which is a region where a downlink control channel may be arranged, and a first element from a resource obtained by dividing one physical resource block pair into a plurality And the second element is composed of a plurality of sets of the first elements, and the downlink control channel is composed of one or more sets of the second elements and applied to the second elements. As the first element mapping method, a first mapping method in which one second element is configured from a set of a plurality of first elements in one physical resource block pair, or a plurality of mapping methods One of the second mapping methods in which one second element is configured from a set of the plurality of first elements in the physical resource block pair is the downlink. A base station that is applied to a link control channel, the uplink control channel resource corresponds to each of the second elements, and performs communication using a plurality of mobile station apparatuses, the downlink control channel, and the uplink control channel An integrated circuit implemented in a device comprising:
Regarding the association between the uplink control channel resource and the second element, different association rules are used when the first mapping method is applied and when the second mapping method is applied. ,
The first mapping method or the second mapping method is set for the downlink control channel used for the mobile station apparatus, and one or more second elements constituting the downlink control channel are set. Based on the first element mapping method applied to the set second element and the set one or more second elements, the uplink control channel resource received from the mobile station apparatus is set. A second radio resource control unit,
A second transmission processing unit for transmitting a signal to the mobile station apparatus using the downlink control channel set by the second radio resource control unit;
An integrated circuit comprising: a second reception processing unit configured to receive a signal from the mobile station apparatus using the uplink control channel resource set by the second radio resource control unit.