JP2013192142A - Communication system, mobile station device, base station device, communication method, and integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable efficient transmission/reception of signals including control information between a base station device and a mobile station device.SOLUTION: A first element is constituted of a resource obtained by dividing one PRB pair into four. The four first elements in the PRB pair are previously mapped to different antenna ports respectively. A mobile station device comprises a first control unit for: controlling so as to perform demodulation processing on signals placed to a first element mapped to a first antenna port and a first element mapped to a second antenna port in two PRB pairs, by using a reference signal of the first antenna port placed to a first resource element; or controlling so as to perform demodulation processing on signals placed to a first element mapped to a third antenna port and a first element mapped to a fourth antenna port in the two PRB pairs, by using a reference signal of the third antenna port placed to a second resource element.

Description

  The present invention efficiently sets an area in which a signal including control information may be arranged in a communication system including a plurality of mobile station apparatuses and a base station apparatus. A communication system, a mobile station apparatus, a base station apparatus, a mobile station apparatus that can efficiently transmit a signal including control information and a mobile station apparatus that can efficiently receive a signal including control information from the base station apparatus, The present invention relates to a communication method and an integrated 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) 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 LTE-A, in order to reduce or suppress interference with a mobile station apparatus in a cell edge region, or to increase received signal power, inter-cell cooperative communication (Cooperative Multipoint) in which neighboring cells perform communication in cooperation with each other. : CoMP communication). 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 the macro base station apparatus or RRH without using cooperative communication, and transmits and receives signals. 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. In LTE-A, introduction of a new control channel for transmitting control information related to a data signal has been studied (Non-Patent Document 1). For example, improving the overall control channel capacity is being considered. For example, it has been considered to support interference coordination in the frequency domain for a new control channel. For example, it is considered to support spatial multiplexing for a new control channel. For example, it is considered to support beamforming for a new control channel. For example, it is considered to support diversity for a new control channel. For example, the use of new 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 beam forming, it is considered to apply cooperative communication and multi-antenna transmission to a new control channel. Specifically, a reference signal for a plurality of base station apparatuses and a plurality of RRHs corresponding to LTE-A to apply precoding processing to a new control channel signal and to demodulate the new control channel signal Application of the same precoding processing to (Reference Signal: RS) is also under consideration. Specifically, a plurality of base station apparatuses corresponding to LTE-A, a plurality of RRHs, a signal and RS of a new control channel to which the same precoding process is applied, and a resource region in which PDSCH is arranged in LTE It is being considered to place and send. The mobile station apparatus corresponding to LTE-A demodulates a signal of a new control channel that has been subjected to the same precoding process using the received RS that has been subjected to the precoding process, and obtains control information. It is being considered to acquire. This method eliminates the need for exchanging information about precoding processing applied to a new control channel signal between the base station apparatus and the mobile station apparatus.

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

3GPP TSG RAN1 # 66bis, Zhuhai, China, 10-14, October, 2011, R1-113589 “Way Forward on downlink control channel enhancements by UE-specific RS”

  It is desirable to transmit and receive the control channel using resources efficiently. The amount of resources that satisfy the requirements for each mobile station device is required for the control channel, and unless efficient use of resources is implemented for the control channel, the capacity of the control channel cannot be increased. The number of mobile station apparatuses to which control channels are assigned cannot be increased.

  The present invention has been made in view of the above points, and an object thereof is an area where a signal including control information may be arranged in a communication system including a plurality of mobile station apparatuses and a base station apparatus. The base station apparatus can efficiently transmit a signal including control information to the mobile station apparatus, and the mobile station apparatus efficiently receives a signal including control information from the base station apparatus. The present invention relates to a communication system, a mobile station apparatus, a base station apparatus, 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 control channel region that is a region where a control channel may be arranged, and one physical resource block pair is divided into four resources. To the first element, and each of the four first elements in one physical resource block pair includes a first antenna port, a second antenna port, a third antenna port, or a fourth antenna element, respectively. A reference signal that is associated with one of the antenna ports in advance and corresponds to the first antenna port is arranged in the first resource element in the physical resource block pair and corresponds to the second antenna port. The signal is placed on the first resource element in the physical resource block pair and is routed to the third antenna port. The reference signal to be transmitted is arranged in the second resource element in the physical resource block pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and one control channel is provided. A communication system that includes the first set of elements and includes a plurality of mobile station apparatuses and a base station apparatus that communicates with the plurality of mobile station apparatuses using the control channel. When the station apparatus configures a certain control channel using the four first elements, the station apparatus is associated with the first antenna port in each of the physical resource block pairs of the two physical resource block pairs. The control channel signal is transmitted to the first amplifier using the first element associated with the first element and the second antenna port. Whether to control to transmit the reference signal using the first antenna port in the first resource element in each of the physical resource block pairs of the two physical resource block pairs. Or the first element associated with the first antenna element and the fourth antenna port associated with the third antenna port in the physical resource block pair of each of the two physical resource block pairs. The control channel signal is transmitted using a third antenna port using a second element, and a reference signal is transmitted using a second resource element in each of the two physical resource block pairs. A second control unit that controls to transmit using a third antenna port, and control of the second control unit A second transmission processing unit that performs precoding processing and transmits the signal of the control channel and the reference signal to the mobile station apparatus based on the instruction. In the case where control channel candidates that may include a control channel addressed to a device and decoding detection is performed on a signal of a control channel candidate composed of the four first elements, two physical resources A signal disposed on the first element associated with the first antenna port and the second antenna port associated with the first antenna port in each physical resource block pair of each block pair; Using the reference signal of the first antenna port arranged in the first resource element in each physical resource block pair of the same two physical resource block pairs The first element and the fourth antenna that are controlled to perform demodulation processing or are associated with the third antenna port in each of the physical resource block pairs of the two physical resource block pairs. A third antenna arranged in a second resource element in each of the physical resource block pairs of the same two physical resource block pairs, with a signal arranged in the first element associated with a port Based on the control instruction of the first control unit and the first control unit that controls to perform demodulation processing using the port reference signal, the control channel candidate signal is demodulated using the reference signal, And a first reception processing unit that performs decoding detection of the control channel candidate signal.

  (2) Further, in the communication system of the present invention, the control channel composed of the four first elements is composed of a plurality of the first elements of two physical resource block pairs continuous in the frequency domain. It is characterized by being.

  (3) Moreover, in the communication system of the present invention, when the second control unit configures a certain control channel using the two first elements, the second control unit includes the second control unit in one physical resource block pair. And transmitting the control channel signal using the first antenna port using the first element associated with one antenna port and the first element associated with the second antenna port. The first resource element controls the reference signal to be transmitted using the first antenna port, or the first resource element is associated with the third antenna port in one physical resource block pair. Transmitting a signal of the control channel using a third antenna port using the first element associated with one element and a fourth antenna port, and a second resource Control to transmit a reference signal using a third antenna port, and the first control unit decodes and detects a control channel candidate signal composed of the two first elements. When performing the above, the signal arranged in the first element associated with the first antenna port associated with the first antenna port in the one physical resource block pair and the first element associated with the second antenna port Are controlled to perform demodulation processing using a reference signal of a first antenna port arranged in a first resource element in the same physical resource block pair, or one physical resource block pair A signal arranged in the first element associated with the third antenna port and the first element associated with the fourth antenna port of the same physical resource. And controlling to perform the demodulation processing using the reference signal of the third antenna port disposed on a second resource element in the lock pairs.

  (4) Further, in the mobile station apparatus of the present invention, a plurality of physical resource block pairs are configured as control channel regions, which are regions where control channels may be arranged, and four physical resource block pairs are provided. A first element is configured from resources divided into four, and the four first elements in one physical resource block pair are respectively a first antenna port, a second antenna port, and a third antenna port. Or a reference signal corresponding to the first antenna port is arranged in the first resource element in the physical resource block pair, and is associated with the antenna port of any one of the fourth antenna port and the second antenna port. The reference signal corresponding to is placed in the first resource element in the physical resource block pair and is connected to the third antenna port. The reference signal to be transmitted is arranged in the second resource element in the physical resource block pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and one control channel is provided. A mobile station apparatus configured from the above set of first elements and communicating with a base station apparatus using the control channel, which is a control channel candidate that may include a control channel addressed to the own apparatus. In the case where decoding detection is performed on the signal of the control channel candidate composed of the four first elements, the first antenna in the physical resource block pair of each of the two physical resource block pairs The signals arranged in the first element associated with the port and the first element associated with the second antenna port are the same 2 Control to perform demodulation using the reference signal of the first antenna port arranged in the first resource element in each of the physical resource block pairs of the physical resource block pair, or two The physical resource block pair of the physical resource block pair is disposed in the first element associated with the third antenna port and the first element associated with the fourth antenna port in the physical resource block pair. Control the received signals to be demodulated using the reference signal of the third antenna port arranged in the second resource element in each of the two physical resource block pairs of the same physical resource block pair And a control channel candidate signal using a reference signal based on the control instruction of the first control unit and the first control unit. And a first reception processing unit for performing decoding processing and detecting decoding of the control channel candidate signal.

  (5) In the mobile station apparatus of the present invention, the control channel including the four first elements includes a plurality of the first elements of two physical resource block pairs continuous in the frequency domain. It is characterized by being configured.

  (6) Moreover, in the mobile station apparatus of the present invention, when the first control unit performs decoding detection on a signal of a control channel candidate composed of the two first elements, Signals arranged in the first element associated with the first antenna port and the second antenna port associated with the first antenna port in the physical resource block pair are the same physical resource block. Control to perform demodulation using the reference signal of the first antenna port arranged in the first resource element in the pair, or the third antenna port in one physical resource block pair The signals allocated to the first element associated with the first antenna and the first element associated with the fourth antenna port are transferred to the second resource energy in the same physical resource block pair. And controlling to perform the demodulation processing using the reference signal of the third antenna ports disposed placement.

  (7) Further, in the base station apparatus of the present invention, a plurality of physical resource block pairs are configured as control channel regions, which are regions where control channels may be arranged, and four physical resource block pairs are provided. A first element is configured from resources divided into four, and the four first elements in one physical resource block pair are respectively a first antenna port, a second antenna port, and a third antenna port. Or a reference signal corresponding to the first antenna port is arranged in the first resource element in the physical resource block pair, and is associated with the antenna port of any one of the fourth antenna port and the second antenna port. The reference signal corresponding to is placed in the first resource element in the physical resource block pair and is connected to the third antenna port. The reference signal to be transmitted is arranged in the second resource element in the physical resource block pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and one control channel is provided. A base station apparatus configured from the set of the first elements described above and communicating with a plurality of mobile station apparatuses using the control channel, wherein a certain control channel is transmitted using the four first elements. In the case of configuring, the first element associated with the first antenna port in the physical resource block pair of each of the two physical resource block pairs and the first element associated with the second antenna port A signal of the control channel is transmitted using a first antenna port using one element, and two physical resource block pairs are transmitted. A first resource element in each of the physical resource block pairs is controlled to transmit a reference signal using a first antenna port, or each of the two physical resource block pairs Using the first element associated with the third antenna port in the physical resource block pair and the first element associated with the fourth antenna port, the signal of the control channel is transmitted to the third antenna. And transmitting the reference signal using the third antenna port in the second resource element in each of the two physical resource block pairs and transmitting the reference signal using the third antenna port. The control channel signal and the reference signal are precoded based on a control instruction of the second control unit and the second control unit. And a second transmission processing unit for performing transmission processing and transmitting to the mobile station apparatus.

  (8) In the base station apparatus of the present invention, the control channel including the four first elements includes a plurality of the first elements of two physical resource block pairs continuous in the frequency domain. It is characterized by being configured.

  (9) Moreover, in the base station apparatus of the present invention, when the second control unit configures a certain control channel using two of the first elements, the second control unit includes one physical resource block pair. The control channel signal is transmitted using the first antenna port using the first element associated with the first antenna port and the first element associated with the second antenna port. And controlling the reference signal to be transmitted using the first antenna port in the first resource element, or the third resource port associated with the third antenna port in one physical resource block pair. The control channel signal is transmitted using the third antenna port using the first element associated with the first element and the fourth antenna port, and the second resource energy is transmitted. And controls to transmit a reference signal in instrument using a third antenna port.

  (10) In the communication method of the present invention, a plurality of physical resource block pairs are configured as control channel regions, which are regions where control channels may be arranged, and one physical resource block pair is divided into four. A first element is configured from the divided resources, and each of the four first elements in one physical resource block pair includes a first antenna port, a second antenna port, a third antenna port, Alternatively, a reference signal that is associated with one of the antenna ports of the fourth antenna port in advance and that corresponds to the first antenna port is arranged in the first resource element in the physical resource block pair, and is connected to the second antenna port. The corresponding reference signal is placed in the first resource element in the physical resource block pair and is connected to the third antenna port. The reference signal to be transmitted is arranged in the second resource element in the physical resource block pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and one control channel is provided. A communication method that is configured from the above set of first elements and is used for a mobile station apparatus that communicates with a base station apparatus using the control channel, and may include a control channel addressed to the own apparatus. When performing decoding detection on a control channel candidate signal composed of four first elements, which is a control channel candidate, in each of the physical resource block pairs of the two physical resource block pairs Arranged in the first element associated with the first antenna port and the first element associated with the second antenna port The received signal is demodulated using the reference signal of the first antenna port arranged in the first resource element in each physical resource block pair of the same two physical resource block pairs. Controlled or associated with the first element and the fourth antenna port associated with the third antenna port in each of the physical resource block pairs of the two physical resource block pairs The signal arranged in the first element is used as the reference signal of the third antenna port arranged in the second resource element in each physical resource block pair of the same two physical resource block pairs. And performing a demodulation process on the control channel candidate signal using a reference signal. And a step of performing decoding detection of a signal of a control channel candidate.

  (11) Also, in the communication method of the present invention, a plurality of physical resource block pairs are configured as control channel regions, which are regions where control channels may be arranged, and one physical resource block pair is divided into four. A first element is configured from the divided resources, and each of the four first elements in one physical resource block pair includes a first antenna port, a second antenna port, a third antenna port, Alternatively, a reference signal that is associated with one of the antenna ports of the fourth antenna port in advance and that corresponds to the first antenna port is arranged in the first resource element in the physical resource block pair, and the second antenna port The corresponding reference signal is placed in the first resource element in the physical resource block pair and is connected to the third antenna port. The reference signal to be transmitted is arranged in the second resource element in the physical resource block pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and one control channel is provided. A communication method that is configured by the first set of elements and is used in a base station apparatus that communicates with a plurality of mobile station apparatuses using the control channel. Corresponding to the first element and the second antenna port associated with the first antenna port in the physical resource block pair of each of the two physical resource block pairs. The control channel signal is transmitted using the first antenna port using the attached first element, and two physical resources are transmitted. A first resource element in each of the physical resource block pairs of the source resource block pair is controlled to transmit a reference signal using a first antenna port, or each of the two physical resource block pairs Using the first element associated with the third antenna port in the physical resource block pair and the first element associated with the fourth antenna port, the signal of the control channel is transmitted to the third antenna. Transmitting using a port and controlling a second resource element in each physical resource block pair of each of the two physical resource block pairs to transmit a reference signal using a third antenna port And the control channel signal and the reference signal are subjected to precoding processing and transferred. And transmitting to the mobile station device.

  (12) In the integrated circuit of the present invention, a plurality of physical resource block pairs are configured as control channel regions, which are regions where control channels may be arranged, and one physical resource block pair is divided into four. A first element is configured from the divided resources, and each of the four first elements in one physical resource block pair includes a first antenna port, a second antenna port, a third antenna port, Alternatively, a reference signal that is associated with one of the antenna ports of the fourth antenna port in advance and that corresponds to the first antenna port is arranged in the first resource element in the physical resource block pair, and is connected to the second antenna port. The corresponding reference signal is placed in the first resource element in the physical resource block pair and is connected to the third antenna port. The reference signal to be transmitted is arranged in the second resource element in the physical resource block pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and one control channel is provided. An integrated circuit configured from the above set of first elements and mounted on a mobile station apparatus that communicates with a base station apparatus using the control channel, and may include a control channel addressed to the own apparatus. When decoding detection is performed on a signal of a control channel candidate that is a certain control channel candidate and includes four first elements, each physical resource block pair of the two physical resource block pairs Arranged in the first element associated with the first antenna port and the first element associated with the second antenna port The received signal is demodulated using the reference signal of the first antenna port arranged in the first resource element in each physical resource block pair of the same two physical resource block pairs. Controlled or associated with the first element and the fourth antenna port associated with the third antenna port in each of the physical resource block pairs of the two physical resource block pairs The signal arranged in the first element is used as the reference signal of the third antenna port arranged in the second resource element in each physical resource block pair of the same two physical resource block pairs. A first control unit that performs control so as to perform demodulation processing, and a signal of a control channel candidate based on a control instruction of the first control unit And a first reception processing unit that performs demodulation processing using a reference signal and decodes and detects the signal of the control channel candidate.

  (13) In the integrated circuit of the present invention, a plurality of physical resource block pairs are configured as control channel regions, which are regions where control channels may be arranged, and one physical resource block pair is divided into four. A first element is configured from the divided resources, and each of the four first elements in one physical resource block pair includes a first antenna port, a second antenna port, a third antenna port, Alternatively, a reference signal that is associated with one of the antenna ports of the fourth antenna port in advance and that corresponds to the first antenna port is arranged in the first resource element in the physical resource block pair, and is connected to the second antenna port. The corresponding reference signal is placed in the first resource element in the physical resource block pair and is connected to the third antenna port. The reference signal to be transmitted is arranged in the second resource element in the physical resource block pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and one control channel is provided. An integrated circuit that is configured from the set of the first elements described above and is mounted on a base station apparatus that communicates with a plurality of mobile station apparatuses using the control channel. When configured using one element, the first element and the second antenna port associated with the first antenna port in each of the physical resource block pairs of the two physical resource block pairs The control channel signal is transmitted using the first antenna port using the associated first element, and two physical resources are transmitted. A first resource element in each of the physical resource block pairs of the source resource block pair is controlled to transmit a reference signal using a first antenna port, or each of the two physical resource block pairs Using the first element associated with the third antenna port in the physical resource block pair and the first element associated with the fourth antenna port, the signal of the control channel is transmitted to the third antenna. And transmitting the reference signal using the third antenna port in the second resource element in each of the two physical resource block pairs and transmitting the reference signal using the third antenna port. The control channel signal and the reference signal based on the control instruction of the second control unit and the second control unit. And a second transmission processing unit that performs precoding processing and transmits the same to the mobile station apparatus.

  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 base station apparatus can efficiently transmit a signal including control information to the mobile station apparatus, and the mobile station apparatus efficiently receives a signal including control information from the base station apparatus. 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 demodulation process of the signal of Localized E-PDCCH of the mobile station apparatus 5 which concerns on embodiment of this invention. It is a flowchart which shows an example of arrangement | positioning and transmission processing of UE-specific RS transmitted with Localized E-PDCCH of the base station apparatus 3 which concerns on embodiment of this invention. It is a figure explaining the outline about the whole picture of the communications system concerning the embodiment of the present invention. It is a figure which shows schematic structure of the time frame of the downlink from the base station apparatus 3 which concerns on embodiment of this invention, 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 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 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 radio 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 the area | region where 2nd PDCCH may be arrange | positioned 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 a structure of E-CCE of embodiment of this invention. It is a figure which shows an example of a structure of E-CCE and Localized E-PDCCH.

  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. UTRA and E-UTRA are part of the universal mobile communication system (UMTS). 3GPP Long Term Evolution (LTE) is a UMTS that uses E-UTRA, which 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, UMTS, 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 terminal, terminal device, 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 a coordinated manner 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).

  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. 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 (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.

  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 (E-PDCCH: 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 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 E-CCE (Enhanced-CCE) (first 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. 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 PRBs (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.

  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 a first type reference signal, a second type reference signal, and a third type reference signal. 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 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 (DL PRB pair) to PDSCH, information indicating allocation of UL PRB (UL PRB pair) to PUSCH, mobile station identifier (Radio) Network Temporary Identifier: RNTI)), modulation system, coding rate, retransmission parameter, spatial multiplexing number, precoding matrix, signal generated from control information such as information indicating a transmission power control command (TPC command) Be placed. Control information included in the PDCCH is referred to as downlink control information (Downlink Control Information: DCI). DCI including information indicating the assignment of DL PRB (DL PRB pair) to PDSCH is referred to as downlink assignment (also referred to as DL assignment or Downlink grant), and UL PRB (UL PRB pair) to PUSCH. The DCI including the information indicating the allocation is referred to as 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 (first resource element) and D2 (second resource element) indicate downlink resource elements in which UE-specific RSs are arranged. When UE-specific RS is transmitted using a plurality of antenna ports, different codes are used for each antenna port. That is, CDM (Code Division Multiplexing) is applied to UE-specific RS. 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. 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 that can be used for transmission of UE-specific RS is four (antenna port 7, antenna port 8, antenna port 9, and antenna port 10). Show. Using a code having a code length of 2, UE-specific RS with two downlink resource elements in the time domain (OFDM symbol) continuous in the same frequency domain (subcarrier) as one unit (unit of CDM) Are multiplexed and arranged. For example, when the number of antenna ports that can be used for transmission of UE-specific RS in base station apparatus 3 and RRH 4 is 4, UE-specific RS is multiplexed on different downlink resource elements for each of the two antenna ports. Placed. In other words, in this case, CDM and FDM (Frequency Division Multiplexing) are applied to multiplexing of UE-specific RS. In FIG. 11, the UE-specific RS of the antenna port 7 and the antenna port 8 can be multiplexed by DDM on D1. In FIG. 11, the UE-specific RS of the antenna port 9 and the antenna port 10 can be multiplexed by DDM on D2.

  In FIG. 11, only the UE-specific RS of the antenna port 7 can be arranged at D1. The transmission power of the UE-specific RS of the antenna port 7 when only the UE-specific RS of the antenna port 7 is arranged in D1 is the transmission power of the UE-specific RS of the antenna port 7 and the antenna port 8 in D1 A value twice as large as the transmission power of the UE-specific RS of the antenna port 7 may be used. In FIG. 11, only the UE-specific RS of the antenna port 9 can be arranged at D2. The transmission power of the UE-specific RS of the antenna port 9 when only the UE-specific RS of the antenna port 9 is arranged in D2 is the transmission power of the UE-specific RS of the antenna port 9 and the antenna port 10 in D2. A value twice as large as the transmission power of the UE-specific RS of the antenna port 9 may be used.

  UE-specific RSs arranged in D1 and D2 are controlled according to the configuration of resources used for transmission of the second PDCCH in the DL PRB pair. For example, the base station apparatus 3 and the RRH 4 transmit two second PDCCHs using half of the resources in the DL PRB pair (two resources of the resources divided into four in the DL PRB pair), respectively. Is performed, the UE-specific RS of the antenna port 7 is arranged in D1, the UE-specific RS of the antenna port 9 is arranged in D2, and the second PDCCH signal and the UE-specific RS are transmitted. For example, the mobile station apparatus 5 performs detection processing of one second PDCCH using half the resources in the DL PRB pair (two resources of the resources divided into four in the DL PRB pair). In this case, the second PDCCH signal is demodulated using the UE-specific RS arranged in D1 or D2 in one DL PRB pair.

  For example, the base station apparatus 3 and the RRH 4 use one half resource in each DL PRB pair of the two DL PRB pairs (two resources of the resources divided into four in the DL PRB pair). When transmitting two second PDCCHs, UE-specific RS of antenna port 7 is arranged in D1 of two DL PRB pairs or UE-specific RS of antenna port 9 in D2 of two DL PRB pairs The RS is arranged, and a second PDCCH signal and UE-specific RS are transmitted. For example, the mobile station apparatus 5 has a half resource in one DL PRB pair (two resources of the resource divided into four in the DL PRB pair) and a half resource (DL PRB pair in a different DL PRB pair). UE, which is arranged in D1 or D2 in both DL PRB pairs, when performing detection processing of one second PDCCH using two resources of the resources divided into four in the pair) -The second PDCCH signal is demodulated using the specific RS.

  For example, when the base station apparatus 3 and the RRH 4 transmit four second PDCCHs using the resources divided into four in the DL PRB pair, the UEs of the antenna port 7 and the antenna port 8 are connected to D1. -Specific RS is arranged, UE-specific RS of antenna port 9 and antenna port 10 is arranged in D2, and the second PDCCH signal and UE-specific RS are transmitted. For example, when the mobile station apparatus 5 performs the detection process of one second PDCCH using the resources divided into four in the DL PRB pair, the UE-specific RS arranged in D1 or D2 is used. Then, the second PDCCH signal is demodulated.

  Further, in the UE-specific RS, a scramble code can be further superimposed on the code of each antenna port. This scramble code is 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 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. Also, the scramble ID and antenna port used can be joint coded to index information indicating them.

  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. This scramble code is generated based on a parameter and a scramble ID individually notified from the base station device 3 and RRH 4 to each mobile station device 5. For example, a plurality of parameter candidates are notified and set by RRC signaling. Furthermore, one parameter is selected from among a plurality of parameter candidates based on downlink control information transmitted and received on the PDCCH, and that parameter is set as a parameter used to generate a scramble code. Also, control information different from the scramble ID may be used as control information indicating one parameter from among a plurality of parameter candidates set by RRC signaling. In addition, information indicating a scramble ID may be used as control information indicating one parameter among a plurality of parameter candidates set by RRC signaling. 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.

  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 notified only from the base station apparatus 3, a CRS signal may be assigned as described above. 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. 12 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. 12 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. 12, descriptions of CRS, UE-specific RS, PDCCH, PDSCH, and the like are omitted for the sake of simplicity.

  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. Base station apparatus 3 and RRH 4 can transmit CSI-RS for one antenna port or two antenna ports using 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. For example, the base station apparatus and RRH4 may assign the same downlink resource element to the CSI-RS and transmit the same sequence from the base station apparatus 3 and RRH4.

  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. The configuration of the CSI-RS includes information indicating the number of antenna ports set in the CSI-RS (antennaPortsCount-r10), information indicating a downlink subframe in which the CSI-RS is arranged (subframeConfig-r10), CSI-RS Information (ResourceConfig-r10) indicating a frequency region where the RS is arranged is included at least. 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. 13 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 PRBs (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 by 110 UL PRBs (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. 13, 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 configured to perform simultaneous transmission of PUSCH and PUCCH, when PUCCH resources and PUSCH resources are allocated in the same uplink subframe, basically, PUCCH resources 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. 13 shows the case where the PUCCH is arranged in the UL PRB at the end 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. For simplification of description, description of the contents related to PUCCH code multiplexing is omitted as appropriate.

  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 number of antenna ports of the base station apparatus 3 (or RRH4) used for communication. Depends on the number of downlink reference signals of the downlink pilot channel according to. As will be described later, the CCE is composed of a plurality of downlink resource elements.

  FIG. 14 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. Hereinafter, the number of CCEs constituting this aggregation is referred to as “CCE aggregation number”. 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. 14, 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. 15 is a diagram illustrating an arrangement example of resource element groups in a downlink radio frame 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 the first to third OFDM symbols, and downlink reference signals (R0, R1) corresponding to CRS of two antenna ports (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. 15, one resource element group is configured by four downlink resource elements adjacent in the frequency domain. In FIG. 15, 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. 15, 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 the next lowest, indicating that the resource element group of the third OFDM symbol is numbered (symbol “3”). Further, in FIG. 15, 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 for which the numbering (symbol“ 3 ”) of the third OFDM symbol in which the downlink reference signal is not arranged is performed is numbered (symbol “5”) is performed. Further, in FIG. 15, 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, a resource element using a block interleaver for all resource element groups numbered as shown in FIG. 15 for the entire downlink system band. Interleaving is performed in units of groups, and one CCE is configured by nine resource element groups having consecutive numbers after interleaving.

<Configuration of second PDCCH>
FIG. 16 shows a region where the second PDCCH may be arranged in the communication system 1 according to the embodiment of the present invention (hereinafter referred to as a second PDCCH region for the sake of simplicity) (control channel). It is a figure which shows an example of schematic structure of (area | region). The base station device 3 can configure (set and arrange) a plurality of second PDCCH regions in the downlink system band. One second PDCCH region is composed of one or more DL PRB pairs. When one second PDCCH region is composed of a plurality of DL PRB pairs, it may be composed of DL PRB pairs dispersed in the frequency domain, or may be composed of DL PRB pairs that are continuous in the frequency domain. . For example, the base station device 3 can configure the second PDCCH region for each of the plurality of mobile station devices 5.

  For example, for a certain second PDCCH region, precoding processing is applied to a signal to be arranged. Note that, in the second PDCCH region where the precoding process is applied to the arranged signal, the same precoding process can be applied to the second PDCCH and the UE-specific RS in the DL PRB pair. Note that, in the second PDCCH region where precoding processing is applied to a signal to be arranged, precoding processing applied to the second PDCCH and UE-specific RS is different between different DL PRB pairs. Processing (different precoding vectors applied) (different precoding matrices applied) may be applied.

  One second PDCCH is composed of one or more E-CCEs (first elements). Note that other terms may be used instead of the term E-CCE. For example, the term E-REG (Enhanced-Resource Element Group) may be used instead of E-CCE. FIG. 17 is a diagram illustrating a logical relationship between the second PDCCH and the E-CCE of the communication system 1 according to the embodiment of the present invention. The E-CCE used between the base station apparatus 3 (or RRH 4) and the mobile station apparatus 5 is assigned a number for identifying the E-CCE. E-CCE numbering is performed based on a predetermined rule. Here, E-CCE t indicates E-CCE of E-CCE number t. The second PDCCH is configured by an aggregate (E-CCE Aggregation) composed of a plurality of E-CCEs. Hereinafter, the number of E-CCEs constituting this aggregation is referred to as “E-CCE aggregation number”. For example, the E-CCE 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 E-CCEs is hereinafter referred to as “E-CCE aggregation n”.

  For example, the base station apparatus 3 configures a second PDCCH with one E-CCE (E-CCE aggregation 1), or configures a second PDCCH with two E-CCEs (E-CCE). aggregation 2) The second PDCCH is configured by four E-CCEs (E-CCE aggregation 4), or the second PDCCH is configured by eight E-CCEs (E-CCE aggregation 8) . For example, the base station apparatus 3 uses an E-CCE aggregation number with a small number of E-CCEs constituting the second PDCCH for the mobile station apparatus 3 with a good channel quality, to the mobile station apparatus 3 with a poor channel quality. In contrast, an E-CCE aggregation number having a large number of E-CCEs constituting the second PDCCH is used. Further, for example, when the base station apparatus 3 transmits DCI with a small number of bits, when using an E-CCE aggregation number with a small number of E-CCEs constituting the second PDCCH, the base station apparatus 3 transmits DCI with a large number of bits. The E-CCE aggregation number having a large number of E-CCEs constituting the second PDCCH is used.

  In FIG. 17, what is indicated by hatching means a second PDCCH candidate (control channel candidate). The second PDCCH candidate (E-PDCCH 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 E-CCE aggregation number. . The second PDCCH candidate configured for each E-CCE aggregation number is configured by one or more different E-CCEs. The number of second PDCCH candidates is set independently for each E-CCE aggregation number. The second PDCCH candidate configured for each E-CCE aggregation number is configured of E-CCEs having consecutive numbers or E-CCEs having non-consecutive numbers. The mobile station apparatus 5 performs second PDCCH decoding detection on the number of second PDCCH candidates set for each E-CCE 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 E-CCEs configured in the 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) to which one E-CCE corresponds is the resource (downlink reference signal, first signal) that can be used for the second PDCCH signal within one DL PRB pair. The resource element used for PDCCH (excluding resource elements) is substantially equal to the amount divided into four.

  FIG. 18 is a diagram illustrating an example of the configuration of the E-CCE according to the embodiment of this invention. Here, resources constituting the E-CCE are shown, and illustrations and descriptions of unrelated parts (PDSCH, first PDCCH) are omitted. Here, one DL PRB pair is shown. Here, the second PDCCH is composed of OFDM symbols from the 4th to the 14th in the 1st slot of the downlink subframe, and the CRS (R0, R1) A case where a UE-specific RS (D1, D2) for one or four antenna ports (antenna port 7, antenna port 8, antenna port 9, antenna port 10, not shown) can be arranged is shown. . In this figure, the vertical axis represents the frequency domain, and the horizontal axis represents the time domain. A resource obtained by dividing a resource that can be used for the signal of the second PDCCH in the DL PRB pair into four is configured as one E-CCE. For example, a resource obtained by dividing a DL PRB pair resource into four in the frequency domain is configured as one E-CCE. Specifically, a resource divided for every three subcarriers in the DL PRB pair is configured as one E-CCE. For example, E-CCEs in the DL PRB pair are numbered in ascending order from E-CCEs including subcarriers that are low in the frequency domain.

  Different physical resource mappings (first physical resource mapping, second physical resource mapping) may be applied to the second PDCCH region. Specifically, the configuration (aggregation method) of the E-CCE configuring one second PDCCH is different. For example, the second PDCCH to which the first physical resource mapping is applied is referred to as a localized E-PDCCH. For example, the second PDCCH to which the second physical resource mapping is applied is referred to as a Distributed E-PDCCH. For example, the localized E-PDCCH is composed of one E-CCE (E-CCE aggregation 1) in one DL PRB pair, or two E-CCEs (E-CCE aggregation 2) in one DL PRB pair. ) Or two E-CCEs in each of two DL PRB pairs, for a total of four E-CCEs (E-CCE aggregation 4). The E-CCE aggregation 4 includes a plurality of E-CCEs of two DL PRB pairs that are continuous in the frequency domain.

  When two E-CCEs are used in the configuration of one second PDCCH (Localized E-PDCCH of E-CCE aggregation 2 or Localized E-PDCCH of E-CCE aggregation 4) in a certain DL PRB pair, E -A plurality of E-CCEs having consecutive CCE numbers (continuous in the frequency domain) are used.

  For example, the distributed E-PDCCH is composed of four E-CCEs (E-CCE aggregation 4) or eight E-CCEs (E-CCE aggregation 8). For example, the distributed E-PDCCH includes a plurality of E-CCEs in which E-CCE numbers are non-contiguous (non-contiguous in the frequency domain). For example, the four E-CCEs that constitute the distributed E-PDCCH of E-CCE aggregation 4 are each configured by E-CCEs in different DL PRB pairs. In addition, eight E-CCEs constituting the distributed E-PDCCH of E-CCE aggregation 8 may be composed of E-CCEs in different DL PRB pairs, or some of the E-CCEs may be It may be composed of E-CCEs within the same DL PRB pair. For example, a plurality of E-CCEs that can be used for one Localized E-PDCCH is composed of E-CCEs in one DL PRB pair, and a plurality of E-CCEs that can be used for Distributed E-PDCCH are a plurality of E-CCEs. It consists of E-CCE in PRB pair.

  FIG. 19 is a diagram illustrating an example of the configurations of E-CCE and Localized E-PDCCH. Here, a case is shown in which the second PDCCH is composed of the fourth to fourteenth OFDM symbols in the downlink subframe. In this figure, the vertical axis represents the frequency domain, and the horizontal axis represents the time domain. For example, the E-CCE aggregation 2 Localized E-PDCCH (E-PDCCH 10 in FIG. 19) has two E-CCEs from the larger E-CCE number (high in the frequency domain) in a certain DL PRB pair. Consists of For example, the E-CCE aggregation 4 Localized E-PDCCH (in FIG. 19, E-PDCCH 100) has a small E-CCE number in each DL PRB pair in two DL PRB pairs that are continuous in the frequency domain. It is composed of two E-CCEs (from the low in the frequency domain). For example, the E-CCE aggregation 4 Localized E-PDCCH (in FIG. 19, E-PDCCH 200) has a large E-CCE number in each DL PRB pair in two DL PRB pairs that are continuous in the frequency domain. It is composed of two E-CCEs (high in the frequency domain).

  For example, in a certain DL PRB pair, one different E-CCE is different from one different localized E-PDCCH (E-CCE aggregation 1) (in FIG. 19, E-PDCCH1, E-PDCCH2, and E- PDCCH3 and E-PDCCH4) are configured. For example, in a certain DL PRB pair, two E-CCEs constitute one different localized E-PDCCH (E-CCE aggregation 1) (in FIG. 19, E-PDCCH5 and E-PDCCH6), which are different. Two E-CCEs constitute one localized E-PDCCH (E-CCE aggregation 2) (E-PDCCH10 in FIG. 19).

  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 made 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.

  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. Also, for each of the second PDCCH regions, information indicating the type of physical resource mapping of the second PDCCH (first physical resource mapping, second physical resource mapping) is transmitted from the base station device 3 to the mobile station. The device 5 can be notified. In addition, not the information that explicitly indicates the type of physical resource mapping of the second PDCCH, but other information is notified from the base station device 3 to the mobile station device 5, and the second PDCCH is implicitly based on the information. A configuration in which the type of physical resource mapping is recognized by the mobile station device 5 may be employed. In addition, as a default, only when the physical resource mapping of any second PDCCH is set in advance in the second PDCCH region and a physical resource mapping different from the setting is used, information indicating that fact is A configuration in which the mobile station apparatus 5 is notified from the station apparatus 3 may be used. 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.

  Each E-CCE in the DL PRB pair is associated with a reference antenna port in advance. For example, in FIG. 18, antenna port 7 (first antenna port) is associated with E-CCE n, antenna port 8 (second antenna port) is associated with E-CCE n + 1, and E−CCE n + 1 is associated with E−CCE n + 1. Antenna port 9 (third antenna port) is associated with CCE n + 2, and antenna port 10 (fourth antenna port) is associated with E-CCE n + 3. When the base station apparatus 3 and the RRH 4 transmit the localized E-PDCCH of the E-CCE aggregation 1 to the mobile station apparatus 5 using the E-CCE n, the signal of the localized E-PDCCH is transmitted using the antenna port 7. While transmitting, UE-specific RS is transmitted by D1 using the antenna port 7. FIG. When the base station apparatus 3 and the RRH 4 transmit the localized E-PDCCH of E-CCE aggregation 1 to the mobile station apparatus 5 using E-CCE n + 1, the signal of the localized E-PDCCH is transmitted using the antenna port 8. While transmitting, UE-specific RS is transmitted by D1 using the antenna port 8. FIG. When the base station apparatus 3 and the RRH 4 transmit the localized E-PDCCH of the E-CCE aggregation 1 to the mobile station apparatus 5 using the E-CCE n + 2, the signal of the localized E-PDCCH is transmitted using the antenna port 9. At the same time, the UE-specific RS is transmitted at D2 using the antenna port 9. When the base station apparatus 3 and the RRH 4 transmit the localized E-PDCCH of the E-CCE aggregation 1 to the mobile station apparatus 5 using the E-CCE n + 3, the signal of the localized E-PDCCH is transmitted using the antenna port 10. At the same time as transmitting, UE-specific RS is transmitted by D2 using antenna port 10.

  When the base station apparatus 3 and the RRH 4 transmit the localized E-PDCCH of the E-CCE aggregation 2 to the mobile station apparatus 5 using the E-CCE n and E-CCE n + 1, the antenna port 7 is used. A Localized E-PDCCH signal is transmitted, and a UE-specific RS is transmitted using D1 using the antenna port 7. When the base station apparatus 3 and the RRH 4 transmit the localized E-PDCCH of the E-CCE aggregation 2 to the mobile station apparatus 5 using the E-CCE n + 2 and the E-CCE n + 3, the antenna port 9 is used. A Localized E-PDCCH signal is transmitted, and a UE-specific RS is transmitted at D2 using the antenna port 9.

  Base station apparatus 3 and RRH 4 use DL PRB pair resources that are continuous in two frequency domains, and use E-CCE n and E-CCE n + 1 of each DL PRB pair, and localized of E-CCE aggregation 4 When transmitting the E-PDCCH to the mobile station apparatus 5, the localized E-PDCCH signal is transmitted using the antenna port 7, and the UE-specific RS is transmitted using D 1 of each DL PRB pair using the antenna port 7. Send. Base station apparatus 3, RRH4 uses DL PRB pair resources that are continuous in two frequency domains, and uses E-CCE aggregation +2 of E-CCE aggregation 4 of each DL PRB pair. When transmitting the E-PDCCH to the mobile station apparatus 5, a localized E-PDCCH signal is transmitted using the antenna port 9, and the UE-specific RS is transmitted using the antenna port 9 and D2 of each DL PRB pair. Send.

  As described above, the mobile station apparatus 5 includes the antenna port that the base station apparatus 3 and the RRH 4 may use for transmitting the localized E-PDCCH signal, and the UE-specific RS transmitted from the antenna port. The resource to be arranged is recognized in advance. The mobile station apparatus 5 demodulates the received Localized E-PDCCH signal using UE-specific RS corresponding to the antenna port used for transmitting the Localized E-PDCCH signal. When performing the process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 1 using E-CCE n, the mobile station apparatus 5 uses the UE-specific RS corresponding to the antenna port 7 arranged in D1. Then, the localized E-PDCCH signal is demodulated. When performing the process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 1 using E-CCE n + 1, the mobile station apparatus 5 uses the UE-specific RS corresponding to the antenna port 8 arranged in D1. Then, the localized E-PDCCH signal is demodulated. When the mobile station apparatus 5 performs the process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 1 using E-CCE n + 2, the mobile station apparatus 5 uses the UE-specific RS corresponding to the antenna port 9 arranged in D2. Then, the localized E-PDCCH signal is demodulated. When performing the process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 1 using E-CCE n + 3, the mobile station apparatus 5 uses the UE-specific RS corresponding to the antenna port 10 arranged in D2. Then, the localized E-PDCCH signal is demodulated.

  When the mobile station apparatus 5 performs the process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 2 using E-CCE n and E-CCE n + 1, the mobile station apparatus 5 corresponds to the antenna port 7 arranged in D1. The localized E-PDCCH signal is demodulated using the UE-specific RS. When the mobile station apparatus 5 performs the process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 2 using E-CCE n + 2 and E-CCE n + 3, the mobile station apparatus 5 corresponds to the antenna port 9 arranged in D2 The localized E-PDCCH signal is demodulated using the UE-specific RS.

  The mobile station apparatus 5 performs a process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 4 using E-CCE n and E-CCE n + 1 in each DL PRB pair of the two DL PRB pairs. When performing, demodulation of the signal of Localized E-PDCCH is performed using UE-specific RS corresponding to the antenna port 7 arrange | positioned at D1 of two DL PRB pairs. The mobile station apparatus 5 performs a process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 4 using E-CCE n + 2 and E-CCE n + 3 in each DL PRB pair of the two DL PRB pairs. When performing, demodulation of the signal of Localized E-PDCCH is performed using UE-specific RS corresponding to the antenna port 9 arrange | positioned at D2 of two DL PRB pairs. Here, the mobile station apparatus 5 that performs decoding detection of E-CCE aggregation 4 performs channel estimation filtering processing using UE-specific RSs arranged in D1 or D2 of two DL PRB pairs, Demodulate the localized E-PDCCH signal using the obtained channel estimation value.

  One Localized E-PDCCH signal is transmitted from one antenna port. One Localized E-PDCCH signal is demodulated using UE-specific RS of one antenna port. One Localized E-PDCCH signal is transmitted from any one of the one or more antenna ports corresponding to each of the one or more E-CCEs used for the Localized E-PDCCH. In the above description, two antenna ports (antenna port 7 and antenna port 8) corresponding to each of one or more E-CCEs used for one localized E-PDCCH (antenna port 9 and antenna port 10) In the above description, the case where the signal of the localized E-PDCCH is transmitted from the antenna port (antenna port 7) (antenna port 9) having the smallest antenna port number has been described. A localized E-PDCCH signal may be transmitted from the port 8) (antenna port 10).

  One Localized E-PDCCH signal is a UE-specific RS of any one or more antenna ports corresponding to each of the one or more E-CCEs used for the Localized E-PDCCH. Is demodulated. In the above description, two antenna ports (antenna port 7 and antenna port 8) corresponding to each of one or more E-CCEs used for one localized E-PDCCH (antenna port 9 and antenna port 10) In the above, a case has been described where a localized E-PDCCH signal is demodulated using the UE-specific RS of the antenna port (antenna port 7) (antenna port 9) with the smallest antenna port number. The signal of the localized E-PDCCH may be demodulated using the UE-specific RS of the antenna port (antenna port 8) (antenna port 10) having the largest.

  When one Localized E-PDCCH signal is transmitted using one E-CCE in the DL PRB pair or two E-CCEs, the Localized E-PDCCH signal is used to transmit the Localized E-PDCCH signal. The UE-specific RS transmitted from the antenna port is arranged and transmitted in one of the downlink resource elements of D1 or D2. When one E-CCE or two E-CCEs in a DL PRB pair with a detection process for one Localized E-PDCCH signal is used, either D1 or D2 downstream Demodulation processing of the localized E-PDCCH signal is performed using the UE-specific RS arranged in the link resource element.

  When a single localized E-PDCCH signal is transmitted using two E-CCEs in each of two DL PRB pairs, in other words, four E-CCEs, the signal of the localized E-PDCCH signal is transmitted. The UE-specific RS transmitted from the antenna port used for transmission is arranged and transmitted in one of the downlink resource elements D1 or D2 in the two DL PRB pairs. When detection processing of one localized E-PDCCH signal is performed using two E-CCEs in each of two DL PRB pairs, in other words, four E-CCEs, two DL PRB pairs The localized E-PDCCH signal is demodulated using UE-specific RS arranged in one of the downlink resource elements D1 or D2.

  The transmission process of the Localized E-PDCCH signal and the UE-specific RS described above is performed using a plurality of processing units of the base station device 3 and the RRH 4. Here, the localized E-PDCCH signal transmission processing is to which E-CCE (including one E-CCE or a plurality of E-CCEs) in the DL PRB pair is arranged (multiplexed). And the process of selecting an antenna port to be used for transmission. Here, the UE-specific RS transmission process is the process of allocating the UE-specific RS to which downlink resource element (D1 or D2 in FIG. 18) in the DL PRB pair, and the antenna port used for transmission. Including the process of selecting. Here, the UE-specific RS transmission process is performed by performing a common precoding process on the UE-specific RS only in one DL PRB pair (E-CCE aggregation 1 or E-CCE aggregation 2). Whether common precoding processing is performed on UE-specific RS in two DL PRB pairs for UE-specific RS for Localized E-PDCCH (for localized E-PDCCH of E-CCE aggregation 4) This is performed for UE-specific RS).

  The above-described demodulation processing using the UE-specific RS of the localized E-PDCCH signal is performed using a plurality of processing units of the mobile station apparatus 5. Here, demodulation processing using the UE-specific RS of the signal of the localized E-PDCCH is UE-specific of any downlink resource element (D1 or D2 in FIG. 18) in the DL PRB pair for channel estimation processing. This includes a process of selecting whether to use RS. Here, the demodulation process using the UE-specific RS of the signal of the localized E-PDCCH is a channel estimation process of the UE-specific RS in units of one DL PRB pair (E-CCE aggregation 1 or E -Performs channel estimation processing of UE-specific RS in units of two DL PRB pairs (performed for UE-specific RS for Localized E-PDCCH of CCE aggregation 2) (Localized E-CCE aggregation 4) (This is performed for UE-specific RS for PDCCH).

  In the second PDCCH region to which the second physical resource mapping is applied, only UE-specific RS for a single antenna port (antenna port 7) may be arranged. The base station device 3 transmits a signal of each E-CCE in the DL PRB pair having the second PDCCH region to which the second physical resource mapping is applied from a single antenna port (antenna port 7). The mobile station apparatus 5 sends each E-CCE signal in the DL PRB pair having the second PDCCH region to which the second physical resource mapping is applied to the antenna port (antenna port 7) in the same DL PRB pair. Demodulate using corresponding UE-specific RS.

  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 for one mobile station apparatus 5 and can be subjected to scramble processing, modulation processing, layer mapping processing, precoding processing, and the like, similarly to the data signal. . Here, the layer mapping process means a part of the MIMO signal process performed when multi-antenna transmission is applied to the second PDCCH. For example, the second PDCCH to which the precoding process is applied and the precoding process are not applied, but the layer mapping process is performed on the second PDCCH to which transmission diversity is applied. In addition, the control signal mapped to the second PDCCH can be subjected to a common precoding process together with the UE-specific RS. At this time, it is preferable that the precoding process is performed with a precoding weight suitable for the mobile station apparatus 5 unit.

  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.

  In the second PDCCH region to which the first physical resource mapping is applied, UE-specific RSs of four antenna ports (antenna port 7, antenna port 8, antenna port 9, and antenna port 10) can be arranged. For example, in FIG. 18, one E-PDCCH is transmitted using E-CCE n, one E-PDCCH is transmitted simultaneously using E-CCE n + 1, and one E-PDCCH is simultaneously transmitted using E-CCE n + 2. -When PDCCH is transmitted and one E-PDCCH is transmitted using E-CCE n + 3 at the same time, UE-specific RSs of four antenna ports are arranged in the DL PRB pair. For example, in FIG. 18, one E-PDCCH is transmitted using E-CCE n, one E-PDCCH is transmitted using E-CCE n + 1 at the same time, and E-CCE n + 2 and E-CCE n + 3 are simultaneously transmitted. , When one E-PDCCH is transmitted, UE-specific RSs of three antenna ports are arranged in the DL PRB pair. For example, in FIG. 18, one E-PDCCH is transmitted using E-CCE n and E-CCE n + 1, and one E-PDCCH is transmitted using E-CCE n + 2 at the same time. When one E-PDCCH is transmitted using n + 3, UE-specific RSs of three antenna ports are arranged in the DL PRB pair. For example, in FIG. 18, one E-PDCCH is transmitted using E-CCE n and E-CCE n + 1, and one E-PDCCH is simultaneously transmitted using E-CCE n + 2 and E-CCE n + 3. In the case of transmission, UE-specific RSs of two antenna ports are arranged in the DL PRB pair.

  For example, in FIG. 18, one E-PDCCH (E-CCE aggregation 4 Localized E-PDCCH) is transmitted using E-CCE n and E-CCE n + 1 of two DL PRB pairs. When one E-PDCCH (Localized E-PDCCH of E-CCE aggregation 4) is transmitted using E-CCE n + 2 and E-CCE n + 3 of multiple DL PRB pairs, each DL PRB pair Then, UE-specific RSs with two antenna ports are arranged. For example, in FIG. 18, one E-PDCCH (E-CCE aggregation 4 Localized E-PDCCH) is transmitted using E-CCE n and E-CCE n + 1 of two DL PRB pairs. E-PDCCH (E-CCE aggregation 1 Localized E-PDCCH) is transmitted using each DL PRB pair E-CCE n + 2, and one E-CCE n + 3 is used for each DL PRB pair E-CCE n + 3. -When PDCCH (Localized E-PDCCH of E-CCE aggregation 1) is transmitted, UE-specific RSs of three antenna ports are arranged in each DL PRB pair. For example, in FIG. 18, one E-PDCCH (E-CCE aggregation 4 Localized E-PDCCH) is transmitted using E-CCE n and E-CCE n + 1 of two DL PRB pairs. When one E-PDCCH (E-CCE aggregation 2 Localized E-PDCCH) is transmitted using E-CCE n + 2 and E-CCE n + 3 of DL PRB pairs of the same, in each DL PRB pair Two antenna port UE-specific RSs are arranged.

  In the second PDCCH region to which the second physical resource mapping is applied, the UE-specific RS of one antenna port (antenna port 7) is arranged. In addition, in the second PDCCH region to which the second physical resource mapping is applied, when transmission diversity such as SFBC (Space Frequency Block Coding) and Open loop precoding is applied to the distributed E-PDCCH, two lines are used. UE-specific RSs of antenna ports (antenna port 7, antenna port 8) (antenna port 7, antenna port 9) may be arranged.

  The mobile station apparatus 5 demodulates one or more E-CCE signals in the DL PRB pair using the UE-specific RS of the corresponding antenna port. The correspondence between the E-CCE signal in the DL PRB pair and the antenna port is determined in advance. Note that a scramble ID defined in advance may be used for generating the UE-specific RS arranged in the second PDCCH region. For example, any value of 0 to 3 may be defined as the scramble ID used for the UE-specific RS.

  The mobile station apparatus 5 monitors the second PDCCH in the second PDCCH region. In the mobile station apparatus 5, a search space is set in the second PDCCH region. The search space means a logical area in which the mobile station apparatus 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 E-CCE aggregation number, different second PDCCH candidates are composed of different E-CCEs (including one E-CCE and a plurality of E-CCEs).

<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 one or more 2nd PDCCH area | regions, and sets DL PRB pair used for each 2nd PDCCH area | region. Moreover, the radio | wireless resource control part 103 sets the antenna port which transmits the signal of each E-CCE in DL PRB pair. Also, the radio resource control 103 sets a downlink resource element (D1 or D2 in FIG. 18) in which UE-specific RS transmitted from each antenna port is arranged. A part of the information set by the radio resource control unit 103 is notified to the mobile station device 5 through the transmission processing unit 107, for example, information indicating the DL PRB pair of the second PDCCH region, the second PDCCH signal, Information indicating the antenna port number used for transmission of the UE-specific RS 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 an ACK / NACK acquired using PUCCH is input, the radio resource control unit 103 allocates PDSCH resources in which NACK is indicated by ACK / NACK to the mobile station apparatus 5.

  The radio resource control unit 103 outputs various control signals to the control unit 105. For example, the control signal transmits the control signal indicating the physical resource mapping (Localized E-PDCCH or Distributed E-PDCCH) of the second PDCCH, and the signal of each E-CCE in the DL PRB pair of the second PDCCH region. Control signal indicating the antenna port to be transmitted, control signal indicating the resource allocation of the second PDCCH, control signal indicating the resource where the UE-specific RS transmitted from each antenna port is allocated, and the amount of phase rotation used for precoding processing Control signals to be shown.

  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 E-CCE aggregation number), UE-specific RS setting in the second PDCCH region, antenna port for transmitting E-CCE signal, precoding processing for PDSCH and PDCCH and UE-specific RS The transmission processing unit 107 is controlled such as setting. For example, the control unit 105 performs a precoding processing unit of UE-specific RS transmitted from each antenna port (performs a common precoding process within one DL PRB pair unit or two DL PRB pair units). To perform common precoding processing). For the localized E-PDCCH in which the E-CCE aggregation number set by the radio resource control unit 103 is E-CCE aggregation 1 or E-CCE aggregation 2 is set in the radio resource control unit 103, the control unit 105 performs UE-specification in the transmission processing unit 107. E-CCE aggregation number set from the radio resource control unit 103 is controlled to perform common precoding processing within one DL PRB pair unit for the RS, and the localized E-PDCCH of E-CCE aggregation 4 For the UE-specific RS, the transmission processing unit 107 performs a common precoding process within two DL PRB pair units. To control such.

  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. Further, the control unit 105 transmits information indicating the second PDCCH region, information indicating the second PDCCH signal and the antenna port number used for transmitting the UE-specific RS, and the like via the transmission processing unit 107. Control is performed to transmit to the mobile station apparatus 5 using PDSCH.

  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 are performed on reception processing section 101. 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 antenna port number used for transmission of the second PDCCH signal and the UE-specific RS, and the higher order, input from the radio resource control unit 103 Information data or the like input from the layer 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 using the PDCCH (first PDCCH, second PDCCH). Transmit to the device 5. Moreover, the transmission process part 107 transmits CRS, UE-specific RS, and CSI-RS. Based on an instruction from the control unit 105, the transmission processing unit 107 performs precoding processing on the localized E-PDCCH signal and the UE-specific RS. Note that the precoding process performed on the UE-specific RS is the same as the precoding process performed on the Localized E-PDCCH corresponding to the UE-specific RS. Here, the same precoding processing means that, for example, the same amount of phase rotation is applied. For the sake of simplification of explanation, it is assumed that information data includes 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 resistance based on the coding rate input from the control unit 105. Here, DCI is controlled in bit units. Note that the coding rate of DCI transmitted on the second PDCCH is related to the set E-CCE 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, CSI-RS, and some UE-specific RSs input from the downlink pilot channel processing unit 205 and outputs the CRS, CSI-RS, and some UE-specific RSs to the multiplexing unit 207. For example, the UE-specific RS that is not subjected to the precoding processing in the precoding processing unit 231 is a UE-specific RS in the DL PRB pair used for the Distributed E-PDCCH. Precoding processing section 231 performs precoding processing on some UE-specific RSs input from downlink pilot channel processing section 205, and outputs the result to multiplexing section 207. For example, the UE-specific RS for which the precoding processing is performed in the precoding processing unit 231 is a UE-specific RS in the DL PRB pair used for the Localized PDCCH.

  The precoding processing unit 231 performs processing similar to 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 for some UE-specific RSs. Do it. More specifically, the precoding processing unit 231 performs precoding processing on a certain E-CCE signal, and the same precoding is performed on a UE-specific RS corresponding to the E-CCE and the antenna port. Execute the process. More specifically, the precoding processing unit 231 performs a common precoding process on a plurality of E-CCE signals constituting one Localized E-PDCCH, and the Localized E-PDCCH and the antenna port correspond to each other. A similar precoding process is executed for the UE-specific RS. Therefore, when demodulating the second PDCCH signal to which the precoding process 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 information (phase rotation amount) of the precoding processing by the precoding processing unit 227, and the mobile station device 5 Can be demodulated. In addition, when the precoding process is not used for the PDSCH in which demodulation processing such as propagation path compensation is performed using the UE-specific RS, or the second PDCCH, the precoding processing unit 231 performs the UE-specific RS The precoding process is not performed, and the result is output to the multiplexing unit 207.

  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 relating to DL PRB pair allocation to the PDSCH set by the radio resource control unit 103, resource allocation to the PDCCH (first PDCCH, second PDCCH), and physical resource mapping of the second PDCCH are sent to the control unit 105. Based on the input control signal, the control unit 105 controls the processing of the multiplexing unit 207. For example, the multiplexing unit 207 multiplexes the second PDCCH signal with the downlink resource using the E-CCE 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 demodulation 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 a process of 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 estimates a propagation path (channel) using the UE-specific RS in the second PDCCH region designated by the base station device 3, and demodulates the second PDCCH signal. Then, processing for detecting a signal including control information addressed to the own apparatus is performed. For example, the reception processing unit 401 recognizes a downlink resource element in which a UE-specific RS used for channel estimation is arranged according to a second PDCCH candidate that performs a process of detecting a second PDCCH signal. Then, the propagation path is estimated using the UE-specific RS of the downlink resource element, and the process of demodulating the second PDCCH signal is performed. For example, the reception processing unit 401 has a downlink in which UE-specific RS used for propagation path estimation is arranged according to an E-CCE aggregation number of a second PDCCH candidate that performs processing to detect a second PDCCH signal. A link resource element is recognized, a propagation path is estimated using the UE-specific RS of the downlink resource element, and a process of demodulating a second PDCCH signal is performed.

  For example, the reception processing unit 401 uses the E-CCE aggregation 1 or the E-CCE aggregation 2 as the second PDCCH candidate E-CCE aggregation number for performing processing for detecting a second PDCCH (Localized E-PDCCH) signal. , The UE recognizes that the downlink resource element in which the UE-specific RS used for channel estimation is arranged is in one DL PRB pair, and the UE of the downlink resource element in one DL PRB pair -A propagation path is estimated using a specific RS, and a process of demodulating a signal of the second PDCCH is performed. For example, if the second PDCCH candidate E-CCE aggregation number for performing processing for detecting a second PDCCH (Localized E-PDCCH) signal is E-CCE aggregation 4, the reception processing unit 401 estimates the propagation path. Recognizing that the downlink resource element in which the UE-specific RS used for the transmission is located is in two DL PRB pairs, propagation using the UE-specific RS of the downlink resource element in the two DL PRB pairs A path estimation filtering process is executed, and a process of demodulating the second PDCCH signal is performed. For example, the reception processing unit 401 uses the E-CCE aggregation 1 or the E-CCE aggregation 2 as the second PDCCH candidate E-CCE aggregation number for performing processing for detecting a second PDCCH (Localized E-PDCCH) signal. In this case, it is recognized that the downlink resource element in which the UE-specific RS used for propagation path estimation is arranged is either D1 or D2 in one DL PRB pair, and the downlink resource element A propagation path is estimated using UE-specific RS, and the process which demodulates the signal of 2nd PDCCH is performed. For example, if the second PDCCH candidate E-CCE aggregation number for performing processing for detecting a second PDCCH (Localized E-PDCCH) signal is E-CCE aggregation 4, the reception processing unit 401 estimates the propagation path. Recognizing that the downlink resource element in which the UE-specific RS used for the transmission is located is either D1 or D2 in the two DL PRB pairs, and using the UE-specific RS of the downlink resource element A filtering process for propagation path estimation is executed, and a process for demodulating the second PDCCH signal is performed.

  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 includes information indicating the DL PRB pair of the second PDCCH region, the second PDCCH signal, and an antenna used for transmission of the UE-specific RS. Contains information indicating the port number.

  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 in the second PDCCH region specified by the radio resource control unit 403. . For example, the control unit 405 controls the reception processing unit 401 to perform demapping of the physical resource of the second PDCCH based on information indicating the physical resource mapping of the second PDCCH instructed by the radio resource control unit 403. To do. 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 sends an E-CCE aggregation number for setting a search space for the second PDCCH region, and the second PDCCH candidate for each E-CCE aggregation number to the reception processing unit 401. Instruct (set). Further, the control unit 405 sets the UE-specific RS of the corresponding antenna port based on the correspondence relationship between the second PDCCH candidate instructed by the radio resource control unit 403 and the corresponding antenna port of the UE-specific RS. The reception processing unit 401 is controlled so as to be used for demodulation of the signal of the second PDCCH candidate.

  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. 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 includes information on the DL PRB pair in the second PDCCH region, information indicating the second PDCCH signal and the antenna port number used for transmission of the UE-specific RS, and the second PDCCH region. The correspondence relationship between each E-CCE (second PDCCH candidate) in the DL PRB pair and the corresponding UE-specific RS antenna port is held, and various control signals are output 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 DM RSs configured with the same UL PRB resources as PUSCH are subjected to the same transmission power control as 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 removal 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. For example, the demultiplexing unit 511 outputs the UE-specific RS in the DL PRB pair that performs decoding detection of the second PDCCH 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 generates a propagation path compensation value from the propagation path estimation value estimated using the UE-specific RS arranged in the multiple DL PRB pairs in the second PDCCH region designated by the own apparatus. To the PDCCH propagation path compensator 519. 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 of the antenna port (one or more is included) designated from the control part 405. 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.

  In FIG. 18, the propagation path estimation unit 513 estimates propagation path fluctuation using the UE-specific RS arranged in D1, or estimates propagation path fluctuation using the UE-specific RS arranged in D2. Control what to do. The channel estimator 513 performs UE-specific RS channel estimation processing (channel fluctuation estimation processing) in units of one DL PRB pair, or UE-specific RS channels in units of two DL PRB pairs. Controls whether to perform estimation processing. The propagation path estimation unit 513 controls how many DL PRB pairs are used for channel estimation processing and how downlink resource elements are used to estimate propagation path fluctuations using the UE-specific RS. Instructed from the unit 405.

  This will be described with reference to FIG. When the reception processing unit 401 controls the reception processing unit 401 to perform the process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 1 using the received signal of E-CCE n, the control unit 405 uses The fluctuation of the propagation path is estimated using the UE-specific RS arranged in D1 of each DL PRB pair, a propagation path compensation value is generated from the estimated propagation path estimation value, and the propagation path compensation unit 519 for PDCCH Control to output. When the reception processing unit 401 controls the reception processing unit 401 to perform the process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 1 using the received signal of E-CCE n + 1, the control unit 405 uses 1 The fluctuation of the propagation path is estimated using the UE-specific RS arranged in D1 of each DL PRB pair, a propagation path compensation value is generated from the estimated propagation path estimation value, and the propagation path compensation unit 519 for PDCCH Control to output. When the reception processing unit 401 controls the reception processing unit 401 to perform the process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 1 using the received signal of E-CCE n + 2, 1 in the propagation path estimation unit 513 The fluctuation of the propagation path is estimated using the UE-specific RS arranged in D2 of the DL PRB pairs, a propagation path compensation value is generated from the estimated propagation path estimation value, and the propagation path compensation unit 519 for PDCCH Control to output. When the reception processing unit 401 controls the reception processing unit 401 to decode and detect the localized E-PDCCH of E-CCE aggregation 1 using the received signal of E-CCE n + 3, the propagation path estimation unit 513 sets 1 The fluctuation of the propagation path is estimated using the UE-specific RS arranged in D2 of the DL PRB pairs, a propagation path compensation value is generated from the estimated propagation path estimation value, and the propagation path compensation unit 519 for PDCCH Control to output.

  When the reception processing unit 401 controls the reception processing unit 401 to perform processing for decoding and detecting the localized E-PDCCH of E-CCE aggregation 2 using the received signals of E-CCE n and E-CCE n + 1, a propagation path The estimation unit 513 estimates propagation path variation using UE-specific RS arranged in D1 of one DL PRB pair, generates a propagation path compensation value from the estimated propagation path estimation value, and performs propagation for PDCCH. Control to output to the path compensation unit 519. When the reception processing unit 401 controls the reception processing unit 401 to perform the process of decoding and detecting the localized E-PDCCH of E-CCE aggregation 2 using the reception signals of E-CCE n + 2 and E-CCE n + 3, the propagation path The estimation unit 513 estimates propagation path variation using UE-specific RS arranged in D2 of one DL PRB pair, generates a propagation path compensation value from the estimated propagation path estimation value, and performs propagation for PDCCH. Control to output to the path compensation unit 519.

  The control unit 405 decodes the localized E-PDCCH of E-CCE aggregation 4 using the received signals of E-CCE n and E-CCE n + 1 of each DL PRB pair of the two DL PRB pairs in the reception processing unit 401. When performing control so as to perform detection processing, the propagation path estimation unit 513 estimates propagation path fluctuation using the UE-specific RS arranged in D1 of two DL PRB pairs, and the estimated propagation path estimation value From this, a channel compensation value is generated and controlled so as to be output to the channel compensation unit 519 for PDCCH. The control unit 405 decodes the localized E-PDCCH of the E-CCE aggregation 4 using the received signals of the E-CCE n + 2 and E-CCE n + 3 of the DL PRB pairs of the two DL PRB pairs in the reception processing unit 401. When performing control so as to perform detection processing, the propagation path estimation unit 513 estimates propagation path fluctuation using the UE-specific RS arranged in D2 of two DL PRB pairs, and the estimated propagation path estimation value From this, a channel compensation value is generated and controlled so as to be output to the channel compensation unit 519 for PDCCH. Here, the propagation path estimation unit 513 performs channel estimation filtering processing using UE-specific RSs arranged in the two DL PRB pairs to obtain channel estimation values.

  Note that the target for decoding detection of E-PDCCH is the second PDCCH candidate. In decoding detection of localized E-PDCCH in E-CCE aggregation 1, E-CCE n becomes one second PDCCH candidate, E-CCE n + 1 becomes one second PDCCH candidate, and E-CCE n + 2 becomes 1. One second PDCCH candidate and E-CCE n + 3 become one second PDCCH candidate. In decoding detection of localized E-PDCCH in E-CCE aggregation 2, a set of E-CCE n and E-CCE n + 1 becomes one second PDCCH candidate, and a set of E-CCE n + 2 and E-CCE n + 3 Becomes one second PDCCH candidate. In decoding detection of localized E-PDCCH in E-CCE aggregation 4, a set of E-CCE n and E-CCE n + 1 of two different DL PRB pairs becomes one second PDCCH candidate, and two different two A set of E-CCE n + 2 and E-CCE n + 3 of DL PRB pair is one second PDCCH candidate.

  Note that the control unit 405 performs estimation processing of a plurality of types of propagation path fluctuations in the propagation path estimation unit 513 according to the second PDCCH candidate that operates so that the reception processing unit 401 performs decoding detection in a certain DL PRB pair. Then, a process for generating a plurality of types of propagation path compensation values is executed. For example, the control unit 405 receives the second PDCCH candidate of E-CCE aggregation 1 in which E-CCE n is used and the second PDCCH candidate of E-CCE aggregation 1 in which E-CCE n + 2 is used. When the unit 401 is operated so as to perform decoding detection, the channel estimation unit 513 uses the UE-specific RS arranged in D1 and the UE-specific RS arranged in D2. And a process for generating a propagation path compensation value from the estimated value of the propagation path fluctuation estimated from the UE-specific RS arranged in D1 in the propagation path estimation unit 513, Estimation of propagation path fluctuation estimated from UE-specific RS arranged in D2 A process for generating a channel compensation value from the value, to the execution.

  For example, the control unit 405 uses the second PDCCH candidate of E-CCE aggregation 1 in which E-CCE n + 2 is used, E-CCE n, E-CCE n + 1, E-CCE n + 2, and E-CCE n + 3. When operating the second PDCCH candidate of E-CCE aggregation 4 so that the reception processing unit 401 performs decoding detection, the channel variation using the UE-specific RS arranged in D1 in the channel estimation unit 513 And a propagation path estimation process using the UE-specific RS arranged in D2, and the propagation path estimation unit 513 estimates the propagation estimated from the UE-specific RS arranged in D2. A process for generating a propagation path compensation value from the estimated value of the path fluctuation, A process for generating a channel compensation value using both the channel fluctuation estimation value estimated from the UE-specific RS and the channel fluctuation estimation value estimated from the UE-specific RS arranged in D2. , Execute.

  For example, the control unit 405 performs propagation when operating the second PDCCH candidate of E-CCE aggregation 1 and the second PDCCH candidate of E-CCE aggregation 4 so that the reception processing unit 401 performs decoding detection. In the path estimation unit 513, the estimation process of the propagation path fluctuation in the unit of UE-specific RS of one DL PRB pair and the estimation process of the propagation path change in the unit of UE-specific RS of two DL PRB pairs are executed. .

  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.

  The physical downlink shared channel decoding unit 517 demodulates and decodes the PDSCH based on an instruction from the control unit 405 to detect 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 propagation path compensation unit 519 designates an E-CCE (one or a plurality of E-CCEs) in the second PDCCH region from the control unit 405, and sets each second PDCCH candidate and It adjusts according to the propagation path compensation value produced | generated based on UE-specific RS of the corresponding antenna port. 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 demaps the first physical resource mapping or demaps the second physical resource mapping for the second PDCCH signal input from the PDCCH channel compensation unit 519. Perform mapping. The PDCCH demapping unit 533 will be described with reference to FIG. 15 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 E-CCEs shown in FIG. The second PDCCH signal is converted into an E-CCE unit signal. For example, the PDCCH demapping unit 533 transmits the input second PDCCH (Localized E-PDCCH) signal to which the first physical resource mapping is applied, as described with reference to FIG. Convert to unit signal. 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 demodulation unit 527 performs QPSK demodulation on the PDCCH signal and outputs the result to the Viterbi decoder unit 529. The Viterbi decoder unit 529 decodes the signal demodulated by the QPSK demodulator 527 and outputs the decoded DCI to the controller 405. Here, this signal is expressed in units of bits, and the Viterbi decoder unit 529 also performs rate dematching in order to adjust the number of bits for performing Viterbi decoding processing on the input bits.

  First, the detection process for the first PDCCH will be described. The mobile station apparatus 5 performs a process of detecting DCI addressed to the own apparatus assuming a plurality of CCE aggregation numbers. The mobile station apparatus 5 performs a different decoding process 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 the DCI. DCI included in the first PDCCH that has not been detected is acquired. Such a process is called blind decoding. In addition, 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. Some CCEs (CCEs) in which blind decoding is performed are referred to as Search spaces. In addition, a different search space is defined for each CCE aggregation number. In the communication system 1 according to the embodiment of the present invention, different search spaces are set in the mobile station apparatus 5 for the first PDCCH. Here, the search space for the first PDCCH of each mobile station apparatus 5 may be configured by completely different CCEs (CCEs), or may be configured by exactly the same CCEs (CCEs), and some of them overlap. CCEs (CCEs) may be configured.

  Next, the detection process for the second PDCCH will be described. The mobile station apparatus 5 performs a process of detecting DCI addressed to itself by assuming a plurality of E-CCE aggregation numbers. An E-CCE aggregation number that may be used in the second PDCCH region is set in the mobile station apparatus 5. The mobile station apparatus 5 performs a different decoding process on the second PDCCH signal for each assumed E-CCE aggregation number (coding rate), and converts it into a CRC code added to the second PDCCH together with the DCI. The DCI included in the second PDCCH in which no error is detected is acquired. Such a process is called blind decoding. Note that the mobile station device 5 does not perform blind decoding assuming the second PDCCH for all E-CCE signals (received signals) in the second PDCCH region configured from the base station device 3. In other words, blind decoding is performed only for some E-CCEs. Some E-CCEs (E-CCEs) in which blind decoding is performed are referred to as Search spaces. Also, a different search space is defined for each E-CCE 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.

  In the mobile station apparatus 5 in which the second PDCCH region is configured, a search space is set in the second PDCCH region. The search space means a logical area in which the mobile station apparatus 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 E-CCE aggregation number, different second PDCCH candidates are composed of different E-CCEs (including one E-CCE and a plurality of E-CCEs). For example, one or more E-CCEs (second PDCCH candidates) used for the search space are set by a random function using an identifier (mobile station identifier) assigned to the mobile station device 5. For example, the base station apparatus 3 sets one or more E-CCEs (second PDCCH candidates) used for the search space for the mobile station apparatus 5 using RRC signaling.

  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 encoding 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 improving 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.

  Further, 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. The physical uplink control channel processing unit 619 is a control unit for realizing frequency domain code multiplexing for PUCCH signals generated from ACK / NACK information bits, SR information bits, or CQI information bits. Multiply the code sequence indicated by 405. The physical uplink control channel processing unit 619 uses a code instructed by the control unit 405 to implement time-domain code multiplexing for PUCCH signals generated from ACK / NACK information bits or SR information bits. Multiply series.

  Uplink 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 a demodulation process of a localized E-PDCCH signal of the mobile station apparatus 5 according to the embodiment of the present invention. Here, a process for each second PDCCH candidate that performs decoding detection will be described. Here, the case where E-CCE aggregation number which may be used for Localized E-PDCCH is E-CCE aggregation 1, E-CCE aggregation 2, or E-CCE aggregation 4 will be described.

  The mobile station apparatus 5 determines whether or not the E-CCE aggregation number of the second PDCCH candidate for decoding detection is E-CCE aggregation 4 (step S101). When the mobile station apparatus 5 determines that the E-CCE aggregation number of the second PDCCH candidate for decoding detection is E-CCE aggregation 4 (step S101: YES), the UE-specific of two DL PRB pairs The localized E-PDCCH signal is demodulated using the channel compensation value generated using the RS (step S102). If the mobile station apparatus 5 determines that the E-CCE aggregation number of the second PDCCH candidate for decoding detection is not E-CCE aggregation 4 (step S101: NO), in other words, the second PDCCH candidate for decoding detection If it is determined that the E-CCE aggregation number of the PDCCH candidate is E-CCE aggregation 1, or E-CCE aggregation 2, the channel compensation value generated using the UE-specific RS of one DL PRB pair Then, the signal of the localized E-PDCCH is demodulated (step S103).

  FIG. 8 is a flowchart illustrating an example of UE-specific RS arrangement and transmission processing transmitted together with the localized E-PDCCH of the base station apparatus 3 according to the embodiment of the present invention. Here, the case where E-CCE aggregation number which may be used for Localized E-PDCCH is E-CCE aggregation 1, E-CCE aggregation 2, or E-CCE aggregation 4 will be described.

  The base station apparatus 3 determines whether or not the E-CCE aggregation number of the localized E-PDCCH transmitted to the mobile station apparatus 5 is E-CCE aggregation 4 (step T101). When the base station apparatus 3 determines that the E-CCE aggregation number of the localized E-PDCCH to be transmitted to the mobile station apparatus 5 is E-CCE aggregation 4 (step T101: YES), the localized E-PDCCH to be transmitted UE-specific RSs corresponding to the above are arranged in two DL PRB pairs and transmitted (step T102). When the base station apparatus 3 determines that the E-CCE aggregation number of the localized E-PDCCH transmitted to the mobile station apparatus 5 is not the E-CCE aggregation 4 (step T101: NO), in other words, the mobile station apparatus 5 determines that the E-CCE aggregation number of the Localized E-PDCCH to be transmitted to 5 is E-CCE aggregation 1 or E-CCE aggregation 2, the UE-specific RS corresponding to the Localized E-PDCCH to be transmitted It arrange | positions and transmits in one DL PRB pair (step T103).

  As described above, in the embodiment of the present invention, in the communication system 1, the base station device 3 assigns a certain control channel (second PDCCH) (Localized E-PDCCH) to the four first elements (E-CCE). ) (E-CCE aggregation 4), the first antenna port (antenna port 7) in each physical resource block pair (DL PRB pair) of two physical resource block pairs (DL PRB pair) ) Associated with the first element (E-CCE) (E-CCE n) and the second antenna port (antenna port 8) (E-CCE) (E-CCE) n + 1) is used to send the signal of the control channel (second PDCCH) (Localized E-PDCCH) to the first antenna port. The first resource element (D1) in each physical resource block pair (DL PRB pair) of the two physical resource block pairs (DL PRB pair). (UE-specific RS) is controlled to be transmitted using the first antenna port (antenna port 7), or each physical resource block pair (DL PRB pair) (DL PRB pair) ( 1st element E-CCE) (E-CCE n + 2) associated with the third antenna port (antenna port 9) in DL PRB pair) and the fourth antenna port (antenna port 10). Control channel using the first element E-CCE) (E-CCE n + 3) 2nd PDCCH) (Localized E-PDCCH) signal is transmitted using a 3rd antenna port (antenna port 9), and each physical resource block pair of two physical resource block pairs (DL PRB pair) The second resource element (D2) in (DL PRB pair) is controlled to transmit the reference signal (UE-specific RS) using the third antenna port, and the control channel (second PDCCH) (Localized) The E-PDCCH signal and the reference signal (UE-specific RS) are transmitted to the mobile station apparatus 5 by performing precoding processing.

  As described above, in the embodiment of the present invention, in the communication system 1, the mobile station device 5 may include a control channel candidate that may include a control channel (second PDCCH) (Localized E-PDCCH) addressed to itself. (Second PDCCH candidate) (E-PDCCH candidate), which is a control channel candidate (second PDCCH candidate) (E-PDCCH candidate) composed of four first elements (E-CCE) When decoding detection is performed on a signal, the first antenna port (antenna port 7) in each physical resource block pair (DL PRB pair) of the two physical resource block pairs (DL PRB pair) The first element (E-CCE) associated with (E-CCE n) A signal arranged in the first element (E-CCE) (E-CCE n + 1) associated with the second antenna port (antenna port 8) is converted into the same two physical resource block pairs (DL PRB pair). Using the reference signal (UE-specific RS) of the first antenna port (antenna port 7) arranged in the first resource element (D1) in each physical resource block pair (DL PRB pair) Or is associated with the third antenna port (antenna port 9) in each physical resource block pair (DL PRB pair) of the two physical resource block pairs (DL PRB pair). The first element (E-CCE) (E-CCE n + 2) and the fourth antenna port (A The signal arranged in the first element (E-CCE) (E-CCE n + 3) associated with the tenor port 10) is transferred to each physical resource block pair of the same two physical resource block pairs (DL PRB pair). Control to perform demodulation using the reference signal (UE-specific RS) of the third antenna port (antenna port 9) arranged in the second resource element (D2) in (DL PRB pair), The control channel candidate (second PDCCH candidate) (E-PDCCH candidate) is demodulated using the reference signal (UE-specific RS) and the control channel candidate (second PDCCH candidate) (E-PDCCH candidate) ) Is detected.

  As a result, the UE-specific RS in the DL PRB pair can be effectively utilized and the E-CCE aggregation 4 of the E-CCE aggregation 4 can be used even when the localized E-PDCCH of any E-CCE aggregation number is transmitted (arranged). The noise tolerance of channel estimation in the mobile station apparatus 5 that receives the localized E-PDCCH can be improved, and the signal error quality can be improved. Since the mobile station apparatus 5 performs channel estimation using UE-specific RS of two DL PRB pairs for the demodulation processing of the localized E-PDCCH of E-CCE aggregation 4, the mobile station apparatus 5 performs the estimation on the channel estimation value. The signal-to-noise ratio can be improved. In general, the signal-to-noise ratio can be improved by increasing the number of samples used for propagation path estimation. Moreover, since the mobile station apparatus 5 performs channel estimation using UE-specific RS over two DL PRB pairs, it is possible to improve the interpolation accuracy in the frequency direction. As a result, the present invention can improve the signal error quality.

  In the embodiment of the present invention, for simplification of description, the resource area where the second PDCCH may be arranged is defined as the second PDCCH area. It is clear that the present invention can be applied if it has a similar meaning.

  In the embodiment of the present invention, the communication system in which cooperative communication by the base station apparatus and RRH is performed is mainly described. However, the communication system in which MU (Multi-User) -MIMO is applied in one base station apparatus. The present invention can also be applied to. For example, MU-MIMO uses a precoding technique or the like for a plurality of mobile station apparatuses existing at different positions (for example, area A and area B) in an area of a base station apparatus using a plurality of transmission antennas. Thus, by controlling the beam for the signals for each mobile station apparatus, even if the same resource is used in the frequency domain and the time domain, the orthogonality of the signals between the mobile station apparatuses is maintained. Alternatively, it is a technique for reducing co-channel interference. Since signals between mobile station apparatuses are spatially demultiplexed, this is also referred to as SDMA (Space Division Multiple Access).

  In MU-MIMO, different precoding processes are applied to each mobile station apparatus that is spatially multiplexed. Within the area of the base station apparatus, different precoding processes can be performed on the second PDCCH and the UE-specific RS of the mobile station apparatus located in area A and the mobile station apparatus located in area B. Regarding the area where the second PDCCH may be arranged, the area is set independently for the mobile station apparatus located in area A and the mobile station apparatus located in area B, and the precoding process is applied independently. Can be done.

  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 control channel region, which is a region where a control channel may be arranged, and one physical resource block pair is divided into four resources. To the first element, and each of the four first elements in one physical resource block pair includes a first antenna port, a second antenna port, a third antenna port, or a fourth antenna element, respectively. A reference signal that is associated with one of the antenna ports in advance and corresponds to the first antenna port is arranged in the first resource element in the physical resource block pair and corresponds to the second antenna port. The signal is placed in the first resource element in the physical resource block pair and corresponds to the third antenna port. The reference signal is arranged in the second resource element in the physical resource block pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and one or more control channels are provided. An integrated circuit that is implemented in a mobile station device that communicates with a base station device using the control channel, and may include a control channel addressed to the device itself When performing decoding detection on a control channel candidate signal composed of four first elements, which is a control channel candidate, in each of the physical resource block pairs of the two physical resource block pairs Arranged on the first element associated with the first antenna port and the first element associated with the second antenna port. The signal is controlled to be demodulated using the reference signal of the first antenna port arranged in the first resource element in each of the two physical resource block pairs of the same physical resource block pair. Or the first element associated with the third antenna port in each physical resource block pair of each of the two physical resource block pairs and the first antenna associated with the fourth antenna port. Demodulate a signal arranged in one element using a reference signal of a third antenna port arranged in a second resource element in each physical resource block pair of the same two physical resource block pairs Based on the control instruction of the first control unit and the first control unit that performs control so as to perform processing, the control channel candidate signal is referred to. And a first reception processing unit that performs demodulation processing using the reference signal and performs decoding detection of the signal of the control channel candidate.

  In the integrated circuit of the present invention, a plurality of physical resource block pairs are configured as a control channel region that is a region where a control channel may be arranged, and one physical resource block pair is divided into four resources. To the first element, and each of the four first elements in one physical resource block pair includes a first antenna port, a second antenna port, a third antenna port, or a fourth antenna element, respectively. A reference signal that is associated with one of the antenna ports in advance and corresponds to the first antenna port is arranged in the first resource element in the physical resource block pair and corresponds to the second antenna port. The signal is placed in the first resource element in the physical resource block pair and the reference corresponding to the third antenna port. The signal is arranged in the second resource element in the physical resource block pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and the control channel has one or more control channels. An integrated circuit configured by a set of the first elements and mounted on a base station apparatus that communicates with a plurality of mobile station apparatuses using the control channel, and includes a control channel including four first control channels When configured using elements, each of the two physical resource block pairs is associated with the first element and the second antenna port associated with the first antenna port in the physical resource block pair. The control channel signal is transmitted using the first antenna port using the first element, and two physical resource blocks are transmitted. A reference signal is transmitted using a first antenna port in a first resource element in each of the physical resource block pairs of each of the two physical resource block pairs, or each of the two physical resource block pairs Using the first element associated with the third antenna port in the physical resource block pair and the first element associated with the fourth antenna port, the signal of the control channel is transmitted to the third antenna. And transmitting the reference signal using the third antenna port in the second resource element in each of the two physical resource block pairs and transmitting the reference signal using the third antenna port. Based on the control instruction of the second control unit and the second control unit, the signal of the control channel and the reference signal are And a second transmission processing unit that performs a recoding process and transmits the result to the mobile station apparatus.

  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 as necessary, and corrected and written. 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 control channel region, which is a region where a control channel may be arranged, and a first element is configured from resources obtained by dividing one physical resource block pair into four, Each of the four first elements in one physical resource block pair is an antenna port that is either a first antenna port, a second antenna port, a third antenna port, or a fourth antenna port. And the reference signal corresponding to the first antenna port is arranged in the first resource element in the physical resource block pair, and the reference signal corresponding to the second antenna port is the first signal in the physical resource block pair. The reference signal placed in one resource element and corresponding to the third antenna port is a physical resource block. The reference signal corresponding to the fourth antenna port is arranged in the second resource element in the pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and the control channel is one or more of the first elements A communication system including a plurality of mobile station apparatuses and a base station apparatus that communicates with the plurality of mobile station apparatuses using the control channel,
The base station device
When a certain control channel is configured using the four first elements, the first associated with the first antenna port in each of the physical resource block pairs of the two physical resource block pairs. The control channel signal is transmitted using the first antenna port using the first element associated with the second antenna port and the second antenna port, and each of the two physical resource block pairs is transmitted. The first resource element in the physical resource block pair is controlled to transmit a reference signal using a first antenna port, or the physical resource block pair of each of the two physical resource block pairs The first element associated with the third antenna port and the first element associated with the fourth antenna port The control channel signal is transmitted using a third antenna port using an element, and a reference signal is transmitted by a second resource element in each physical resource block pair of each of the two physical resource block pairs. A second control unit that controls transmission using three antenna ports;
A second transmission processing unit configured to perform precoding processing and transmit the signal of the control channel and the reference signal to the mobile station apparatus based on a control instruction of the second control unit; ,
The mobile station device
In the case of performing decoding detection on a control channel candidate signal that may include a control channel addressed to its own device and is composed of the four first elements, the two physical Signals arranged in the first element associated with the first antenna port and the second antenna port associated with the first antenna port in each physical resource block pair of each resource block pair , Control to perform demodulation processing using the reference signal of the first antenna port arranged in the first resource element in each of the two physical resource block pairs of the same physical resource block pair, Or, the two of the physical resource block pairs are associated with a third antenna port in each of the physical resource block pairs. A second resource element in each of the physical resource block pairs of the same two physical resource block pairs, the signal arranged in the first element associated with one element and the fourth antenna port A first control unit that performs control so as to perform demodulation processing using a reference signal of a third antenna port disposed in
A first reception processing unit that performs demodulation processing of a control channel candidate signal using a reference signal based on a control instruction of the first control unit, and performs decoding detection of the control channel candidate signal. A communication system characterized by the above.   The control channel composed of four of the first elements is composed of a plurality of the first elements of two physical resource block pairs that are continuous in the frequency domain. Communication system. When the second control unit configures a certain control channel by using the two first elements, the first control unit is associated with the first antenna port in one physical resource block pair. The first element associated with the second antenna port and the first antenna port are used to transmit the control channel signal using the first antenna port, and the first resource element transmits the reference signal first. Control to transmit using the antenna port of the first or second antenna port associated with the third antenna port in one physical resource block pair The control channel signal is transmitted using a third antenna port using the first element and the reference signal is transmitted to the third antenna port using a second resource element. Controlled to be transmitted using,
When the first control unit performs decoding detection on a signal of a control channel candidate configured by two of the first elements, the first control unit includes a first antenna port in one physical resource block pair, The signals arranged in the first element associated with the first element associated with the second antenna port and the first element associated with the second antenna port are arranged in the first resource element in the same physical resource block pair. Control is performed to perform demodulation processing using a reference signal of one antenna port, or the first element and the fourth element associated with the third antenna port in one physical resource block pair A third antenna port arranged in the second resource element in the same physical resource block pair with a signal arranged in the first element associated with the antenna port of Communication system according to claim 1, wherein the controller controls to perform the demodulation processing using the reference signal. A plurality of physical resource block pairs are configured as a control channel region, which is a region where a control channel may be arranged, and a first element is configured from resources obtained by dividing one physical resource block pair into four, Each of the four first elements in one physical resource block pair is an antenna port that is either a first antenna port, a second antenna port, a third antenna port, or a fourth antenna port. And the reference signal corresponding to the first antenna port is arranged in the first resource element in the physical resource block pair, and the reference signal corresponding to the second antenna port is the first signal in the physical resource block pair. The reference signal placed in one resource element and corresponding to the third antenna port is a physical resource block. The reference signal corresponding to the fourth antenna port is arranged in the second resource element in the pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and the control channel is one or more of the first elements A mobile station apparatus configured to communicate with a base station apparatus using the control channel,
In the case of performing decoding detection on a control channel candidate signal that may include a control channel addressed to its own device and is composed of the four first elements, the two physical Signals arranged in the first element associated with the first antenna port and the second antenna port associated with the first antenna port in each physical resource block pair of each resource block pair , Control to perform demodulation processing using the reference signal of the first antenna port arranged in the first resource element in each of the two physical resource block pairs of the same physical resource block pair, Or, the two of the physical resource block pairs are associated with a third antenna port in each of the physical resource block pairs. A second resource element in each of the physical resource block pairs of the same two physical resource block pairs, the signal arranged in the first element associated with one element and the fourth antenna port A first control unit that performs control so as to perform demodulation processing using a reference signal of a third antenna port disposed in
A first reception processing unit that performs demodulation processing of a control channel candidate signal using a reference signal based on a control instruction of the first control unit, and performs decoding detection of the control channel candidate signal. A mobile station apparatus characterized by the above.   The control channel composed of four of the first elements is composed of a plurality of the first elements of two physical resource block pairs that are continuous in the frequency domain. Mobile station equipment.   When the first control unit performs decoding detection on a signal of a control channel candidate configured by two of the first elements, the first control unit includes a first antenna port in one physical resource block pair, The signals arranged in the first element associated with the first element associated with the second antenna port and the first element associated with the second antenna port are arranged in the first resource element in the same physical resource block pair. Control is performed to perform demodulation processing using a reference signal of one antenna port, or the first element and the fourth element associated with the third antenna port in one physical resource block pair A third antenna port arranged in the second resource element in the same physical resource block pair with a signal arranged in the first element associated with the antenna port of The mobile station apparatus according to claim 4, wherein the controller controls to perform the demodulation processing using the reference signal. A plurality of physical resource block pairs are configured as a control channel region, which is a region where a control channel may be arranged, and a first element is configured from resources obtained by dividing one physical resource block pair into four, Each of the four first elements in one physical resource block pair is an antenna port that is either a first antenna port, a second antenna port, a third antenna port, or a fourth antenna port. And the reference signal corresponding to the first antenna port is arranged in the first resource element in the physical resource block pair, and the reference signal corresponding to the second antenna port is the first signal in the physical resource block pair. The reference signal placed in one resource element and corresponding to the third antenna port is a physical resource block. The reference signal corresponding to the fourth antenna port is arranged in the second resource element in the pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and the control channel is one or more of the first elements A base station apparatus configured to communicate with a plurality of mobile station apparatuses using the control channel,
When a certain control channel is configured using the four first elements, the first associated with the first antenna port in each of the physical resource block pairs of the two physical resource block pairs. The control channel signal is transmitted using the first antenna port using the first element associated with the second antenna port and the second antenna port, and each of the two physical resource block pairs is transmitted. The first resource element in the physical resource block pair is controlled to transmit a reference signal using a first antenna port, or the physical resource block pair of each of the two physical resource block pairs The first element associated with the third antenna port and the first element associated with the fourth antenna port The control channel signal is transmitted using a third antenna port using an element, and a reference signal is transmitted by a second resource element in each physical resource block pair of each of the two physical resource block pairs. A second control unit that controls transmission using three antenna ports;
A second transmission processing unit that performs precoding processing and transmits the signal of the control channel and the reference signal to the mobile station apparatus based on a control instruction of the second control unit. A base station apparatus characterized by the above.   The control channel configured by four of the first elements is configured by a plurality of the first elements of two physical resource block pairs continuous in the frequency domain. Base station equipment.   When the second control unit configures a certain control channel by using the two first elements, the first control unit is associated with the first antenna port in one physical resource block pair. The first element associated with the second antenna port and the first antenna port are used to transmit the control channel signal using the first antenna port, and the first resource element transmits the reference signal first. Control to transmit using the antenna port of the first or second antenna port associated with the third antenna port in one physical resource block pair The control channel signal is transmitted using a third antenna port using the first element and the reference signal is transmitted to the third antenna port using a second resource element. The base station apparatus according to claim 7, wherein the controller controls to transmit using. A plurality of physical resource block pairs are configured as a control channel region, which is a region where a control channel may be arranged, and a first element is configured from resources obtained by dividing one physical resource block pair into four, Each of the four first elements in one physical resource block pair is an antenna port that is either a first antenna port, a second antenna port, a third antenna port, or a fourth antenna port. And the reference signal corresponding to the first antenna port is arranged in the first resource element in the physical resource block pair, and the reference signal corresponding to the second antenna port is the first signal in the physical resource block pair. The reference signal placed in one resource element and corresponding to the third antenna port is a physical resource block. The reference signal corresponding to the fourth antenna port is arranged in the second resource element in the pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and the control channel is one or more of the first elements A communication method used for a mobile station apparatus configured to communicate with a base station apparatus using the control channel,
In the case of performing decoding detection on a control channel candidate signal that may include a control channel addressed to its own device and is composed of the four first elements, the two physical Signals arranged in the first element associated with the first antenna port and the second antenna port associated with the first antenna port in each physical resource block pair of each resource block pair , Control to perform demodulation processing using the reference signal of the first antenna port arranged in the first resource element in each of the two physical resource block pairs of the same physical resource block pair, Or, the two of the physical resource block pairs are associated with a third antenna port in each of the physical resource block pairs. A second resource element in each of the physical resource block pairs of the same two physical resource block pairs, the signal arranged in the first element associated with one element and the fourth antenna port Controlling to perform demodulation processing using a reference signal of the third antenna port arranged in
A communication method comprising: demodulating a control channel candidate signal using a reference signal and performing decoding detection of the control channel candidate signal. A plurality of physical resource block pairs are configured as a control channel region, which is a region where a control channel may be arranged, and a first element is configured from resources obtained by dividing one physical resource block pair into four, Each of the four first elements in one physical resource block pair is an antenna port that is either a first antenna port, a second antenna port, a third antenna port, or a fourth antenna port. And the reference signal corresponding to the first antenna port is arranged in the first resource element in the physical resource block pair, and the reference signal corresponding to the second antenna port is the first signal in the physical resource block pair. The reference signal placed in one resource element and corresponding to the third antenna port is a physical resource block. The reference signal corresponding to the fourth antenna port is arranged in the second resource element in the pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and the control channel is one or more of the first elements A communication method used for a base station apparatus configured to communicate with a plurality of mobile station apparatuses using the control channel,
When a certain control channel is configured using the four first elements, the first associated with the first antenna port in each of the physical resource block pairs of the two physical resource block pairs. The control channel signal is transmitted using the first antenna port using the first element associated with the second antenna port and the second antenna port, and each of the two physical resource block pairs is transmitted. The first resource element in the physical resource block pair is controlled to transmit a reference signal using a first antenna port, or the physical resource block pair of each of the two physical resource block pairs The first element associated with the third antenna port and the first element associated with the fourth antenna port The control channel signal is transmitted using a third antenna port using an element, and a reference signal is transmitted by a second resource element in each physical resource block pair of each of the two physical resource block pairs. Controlling to transmit using three antenna ports;
And a step of performing precoding processing and transmitting the control channel signal and the reference signal to the mobile station apparatus. A plurality of physical resource block pairs are configured as a control channel region, which is a region where a control channel may be arranged, and a first element is configured from resources obtained by dividing one physical resource block pair into four, Each of the four first elements in one physical resource block pair is an antenna port that is either a first antenna port, a second antenna port, a third antenna port, or a fourth antenna port. And the reference signal corresponding to the first antenna port is arranged in the first resource element in the physical resource block pair, and the reference signal corresponding to the second antenna port is the first signal in the physical resource block pair. The reference signal placed in one resource element and corresponding to the third antenna port is a physical resource block. The reference signal corresponding to the fourth antenna port is arranged in the second resource element in the pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and the control channel is one or more of the first elements An integrated circuit mounted on a mobile station apparatus that communicates with a base station apparatus using the control channel,
In the case of performing decoding detection on a control channel candidate signal that may include a control channel addressed to its own device and is composed of the four first elements, the two physical Signals arranged in the first element associated with the first antenna port and the second antenna port associated with the first antenna port in each physical resource block pair of each resource block pair , Control to perform demodulation processing using the reference signal of the first antenna port arranged in the first resource element in each of the two physical resource block pairs of the same physical resource block pair, Or, the two of the physical resource block pairs are associated with a third antenna port in each of the physical resource block pairs. A second resource element in each of the physical resource block pairs of the same two physical resource block pairs, the signal arranged in the first element associated with one element and the fourth antenna port A first control unit that performs control so as to perform demodulation processing using a reference signal of a third antenna port disposed in
A first reception processing unit that performs demodulation processing of a control channel candidate signal using a reference signal based on a control instruction of the first control unit, and performs decoding detection of the control channel candidate signal. An integrated circuit characterized by. A plurality of physical resource block pairs are configured as a control channel region, which is a region where a control channel may be arranged, and a first element is configured from resources obtained by dividing one physical resource block pair into four, Each of the four first elements in one physical resource block pair is an antenna port that is either a first antenna port, a second antenna port, a third antenna port, or a fourth antenna port. And the reference signal corresponding to the first antenna port is arranged in the first resource element in the physical resource block pair, and the reference signal corresponding to the second antenna port is the first signal in the physical resource block pair. The reference signal placed in one resource element and corresponding to the third antenna port is a physical resource block. The reference signal corresponding to the fourth antenna port is arranged in the second resource element in the pair, the reference signal corresponding to the fourth antenna port is arranged in the second resource element in the physical resource block pair, and the control channel is one or more of the first elements An integrated circuit implemented in a base station apparatus that communicates with a plurality of mobile station apparatuses using the control channel,
When a certain control channel is configured using the four first elements, the first associated with the first antenna port in each of the physical resource block pairs of the two physical resource block pairs. The control channel signal is transmitted using the first antenna port using the first element associated with the second antenna port and the second antenna port, and each of the two physical resource block pairs is transmitted. The first resource element in the physical resource block pair is controlled to transmit a reference signal using a first antenna port, or the physical resource block pair of each of the two physical resource block pairs The first element associated with the third antenna port and the first element associated with the fourth antenna port The control channel signal is transmitted using a third antenna port using an element, and a reference signal is transmitted by a second resource element in each physical resource block pair of each of the two physical resource block pairs. A second control unit that controls transmission using three antenna ports;
A second transmission processing unit that performs precoding processing and transmits the signal of the control channel and the reference signal to the mobile station apparatus based on a control instruction of the second control unit. An integrated circuit characterized by.