JP2013042262A - Mobile station device, base station device, wireless communication method, wireless communication system, and integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a mobile station device which is set to decode an E-PDCCH to efficiently perform a random access procedure.SOLUTION: When a mobile station device 1 receives instruction information to start a random access procedure from a base station device 3 by a PDCCH, the mobile station device 1 receives information to be used for scheduling a random access response to transmission of a random access preamble from the base station device 3 by the PDCCH. When the mobile station device 1 receives instruction information to start the random acces procedure from the base station device 3 by an E-PDCCH, the mobile station device 1 receives information to be used for scheduling the random access response to transmission of the random access preamble from the base station device 3 by the E-PDCCH.

Description

  The present invention relates to a mobile station apparatus, a base station apparatus, a radio communication method, a radio communication system, and an integrated circuit.

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

  In LTE, the base station apparatus performs downlink control information (Downlink Control Information: DCI) used for scheduling of a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH). ) Using a physical downlink control channel (PDCCH).

  In 3GPP, in order to increase the number of terminals that can be accommodated by one base station, an enhanced physical downlink control channel (E-PDCCH) is used for transmission of downlink control information. It has been studied to use (Non-patent Document 1). The E-PDCCH is arranged in the PDSCH region.

  In LTE, the mobile station apparatus performs random access mainly for the purpose of synchronizing the time domain of the base station apparatus 3 with the base station apparatus 3 (timing adjustment for uplink transmission) (non-patent document 2). Random access is also used for initial connection establishment procedures, handover procedures, connection re-establishment procedures, and requests for uplink radio resource allocation.

"Enhancements for UE specific control signaling", R1-111332, 3GPP TSG-RAN WG1 Meeting # 65, Barcelona, Spain, 9th-13th May 2011. "TS36.321 v10.2.0", 3GPP, 24 June 2011.

  However, in the conventional technology, a physical random access channel (PRACH), a physical uplink shared channel (PUSCH), a physical downlink shared channel (PDSCH), and a physical downlink The mobile station apparatus and the base station apparatus perform a random access procedure using a physical downlink control channel (PDCCH), and the mobile station apparatus set to decode the E-PDCCH efficiently performs random access. There was a problem that the procedure could not be performed.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a mobile station apparatus, a base station, and a mobile station apparatus that are set to decode the E-PDCCH and that can efficiently perform a random access procedure. An object is to provide a station apparatus, a wireless communication method, a wireless communication system, and an integrated circuit.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the mobile station apparatus of the present invention is a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from the base station apparatus, and includes first information that instructs the start of a random access procedure. Is transmitted from the base station apparatus on the extended physical downlink control channel, and a random access preamble is transmitted to the base station apparatus on the physical random access channel according to the first information, and the random access preamble is transmitted. 2nd information used for scheduling of random access response to the base station apparatus is received from the base station apparatus on the physical downlink control channel, and the random access response is received on the physical downlink shared channel according to the second information. Characterized by receiving from To have.

  (2) A mobile station apparatus according to the present invention is a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus, and instructs to start a random access procedure. 1 information is received from the base station device using the physical downlink control channel or the extended physical downlink control channel, and a random access preamble is received using the physical random access channel according to the first information. When the first information is received on the physical downlink control channel, second information used for scheduling a random access response to the transmission of the random access preamble is transmitted on the physical downlink control channel. Received from the base station apparatus and the expanded When the first information is received through a downlink control channel, the second information is received from the base station apparatus through the extended physical downlink control channel, and the random access is performed according to the second information. A response is received from the base station apparatus through a physical downlink shared channel.

(3) The mobile station apparatus of the present invention is a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus, and starts a random access procedure in a primary cell. Receiving from the base station apparatus the first information instructing on the physical downlink control channel,
The second information instructing the start of the random access procedure in the secondary cell is received from the base station apparatus using the extended physical downlink control channel.

  (4) Further, in the mobile station apparatus described above, the present invention simultaneously monitors the physical downlink control channel and the extended physical downlink control channel, and the extended physical downlink control channel It is characterized by being arranged in a link shared channel region.

  (5) The base station apparatus of the present invention is a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to the mobile station apparatus, and instructs the mobile station apparatus to start a random access procedure. 1 information is written (in the specification: the physical downlink control channel or the extended physical downlink control channel) to the mobile station apparatus, and the mobile station apparatus transmits according to the first information A random access preamble is received from the mobile station apparatus via a physical random access channel, and second information used for scheduling a random access response to the transmission of the random access preamble is transmitted to the mobile station apparatus via the physical downlink control channel. Send the random access response to the physical downlink It is characterized by transmitting to the mobile station device using the clock shared channel.

  (6) The base station apparatus of the present invention is a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station apparatus, and instructs the start of a random access procedure. 1 information is transmitted to the mobile station apparatus using the physical downlink control channel or the extended physical downlink control channel, and the random access preamble transmitted according to the first information is physically randomized by the mobile station apparatus. When receiving from the mobile station apparatus via the access channel and transmitting the first information via the physical downlink control channel, the second information used for scheduling the random access response to the transmission of the random access preamble Transmit to the mobile station apparatus on the physical downlink control channel When the first information is transmitted on the extended physical downlink control channel, the second information is transmitted to the mobile station apparatus on the extended physical downlink control channel, and the random access is performed. A response is transmitted to the mobile station apparatus through a physical downlink shared channel.

  (7) The base station apparatus of the present invention is a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station apparatus, and starts a random access procedure in a primary cell. Is transmitted to the mobile station apparatus using the physical downlink control channel, and second information is transmitted to the extended physical downlink control channel for instructing the start of a random access procedure in a secondary cell. And transmitting to the mobile station apparatus.

  (8) A radio communication method of the present invention is a radio communication method used in a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus, and includes a random access procedure. Is received from the base station apparatus using the extended physical downlink control channel, and a random access preamble is transmitted to the base station apparatus using the physical random access channel according to the first information. Transmitting the second information used for scheduling the random access response to the transmission of the random access preamble from the base station apparatus on the physical downlink control channel, and physically receiving the random access response according to the second information The base station in the downlink shared channel It is characterized by receiving placed al.

  (9) A radio communication method of the present invention is a radio communication method used in a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus, and includes a random access procedure. Is received from the base station apparatus on the physical downlink control channel or the extended physical downlink control channel, and a random access preamble is physically random accessed according to the first information. When transmitting to the base station apparatus through a channel and receiving the first information through the physical downlink control channel, second information used for scheduling a random access response to transmission of the random access preamble Whether the base station apparatus is a physical downlink control channel And when receiving the first information on the extended physical downlink control channel, receiving the second information from the base station apparatus on the extended physical downlink control channel, The random access response is received from the base station apparatus through a physical downlink shared channel according to second information.

  (10) A radio communication method of the present invention is a radio communication method used in a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus, and is a primary cell. The first information for instructing the start of the random access procedure is received from the base station apparatus on the physical downlink control channel, and the second information for instructing the start of the random access procedure in the secondary cell is the extended. In addition, the reception is performed from the base station apparatus using a physical downlink control channel.

  (11) A radio communication method of the present invention is a radio communication method used in a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station apparatus, and includes a random access procedure. The first information instructing the start of transmission is transmitted to the mobile station apparatus using the extended physical downlink control channel, and the random access preamble transmitted according to the first information is transmitted by the mobile station apparatus according to the physical random access. Second information received by the channel from the mobile station apparatus and used for scheduling of a random access response to the transmission of the random access preamble is transmitted to the mobile station apparatus by the physical downlink control channel, and the random access response is transmitted. The mobile station in the physical downlink shared channel It is characterized by transmitting to the location.

  (12) A radio communication method of the present invention is a radio communication method used in a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station apparatus, and includes a random access procedure. Is transmitted to the mobile station apparatus using the physical downlink control channel or the extended physical downlink control channel, and the mobile station apparatus transmits the first information in accordance with the first information. When an access preamble is received from the mobile station apparatus through a physical random access channel and the first information is transmitted through the physical downlink control channel, it is used for scheduling a random access response to the transmission of the random access preamble. Second information to be transmitted to the physical downlink control channel When the first information is transmitted on the extended physical downlink control channel, the second information is transmitted on the extended physical downlink control channel when the first information is transmitted on the extended physical downlink control channel. It transmits to a station apparatus, The said random access response is transmitted to the said mobile station apparatus by a physical downlink shared channel, It is characterized by the above-mentioned.

  (13) A radio communication method of the present invention is a radio communication method used in a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station apparatus. The first information for instructing the start of a random access procedure is transmitted to the mobile station apparatus on the physical downlink control channel, and the second information for instructing the start of a random access procedure in a secondary cell is added to the extended information. In addition, the mobile station apparatus transmits the data using the physical downlink control channel.

  (14) An integrated circuit according to the present invention is an integrated circuit used in a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus, and starts a random access procedure. Is received from the base station apparatus on the extended physical downlink control channel, and a random access preamble is transmitted to the base station apparatus on the physical random access channel according to the first information. Receiving second information used for scheduling of random access response to transmission of the random access preamble from the base station apparatus on the physical downlink control channel, and receiving the random access response according to the second information on the physical downlink Whether the base station apparatus is a shared channel It is characterized in that it receives.

  (15) An integrated circuit according to the present invention is an integrated circuit used in a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus, and starts a random access procedure. Is received from the base station apparatus using the physical downlink control channel or the extended physical downlink control channel, and a random access preamble is transmitted using the physical random access channel according to the first information. When the first information is transmitted to the base station apparatus and received through the physical downlink control channel, the second information used for scheduling of a random access response to the transmission of the random access preamble is transmitted to the physical downlink control channel. Received from the base station device via a link control channel When the first information is received on the extended physical downlink control channel, the second information is received from the base station apparatus on the extended physical downlink control channel, and the second information The random access response is received from the base station apparatus through a physical downlink shared channel in accordance with the information described above.

  (16) An integrated circuit according to the present invention is an integrated circuit used in a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus, and is a random circuit in a primary cell. First information instructing the start of an access procedure is received from the base station apparatus on the physical downlink control channel, and second information instructing the start of a random access procedure in a secondary cell is received in the extended physical It receives from the said base station apparatus with a downlink control channel, It is characterized by the above-mentioned.

  (17) An integrated circuit according to the present invention is an integrated circuit used in a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station apparatus, and starts a random access procedure. Is transmitted to the mobile station apparatus using the extended physical downlink control channel, and the random access preamble transmitted according to the first information is transmitted using the physical random access channel. Second information received from the mobile station apparatus and used for scheduling of a random access response for transmission of the random access preamble is transmitted to the mobile station apparatus on the physical downlink control channel, and the random access response is transmitted to the physical downlink apparatus. Sent to the mobile station device via a link shared channel It is characterized in that.

  (18) The integrated circuit of the present invention is an integrated circuit used in a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station apparatus, and starts a random access procedure. Is transmitted to the mobile station apparatus using the physical downlink control channel or the extended physical downlink control channel, and the mobile station apparatus transmits the random access preamble according to the first information. Is received from the mobile station apparatus using a physical random access channel and the first information is transmitted using the physical downlink control channel, the first information used for scheduling of a random access response to the transmission of the random access preamble. 2 information in the physical downlink control channel When the first information is transmitted on the extended physical downlink control channel, the second information is transmitted on the extended physical downlink control channel when the first information is transmitted to the mobile station device. And the random access response is transmitted to the mobile station apparatus through a physical downlink shared channel.

  (19) The integrated circuit of the present invention is an integrated circuit used in a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station apparatus, and is a random number in a primary cell. First information instructing the start of an access procedure is transmitted to the mobile station apparatus on the physical downlink control channel, and second information instructing the start of a random access procedure in a secondary cell is transmitted in the extended physical It transmits to the said mobile station apparatus with a downlink control channel, It is characterized by the above-mentioned.

  According to the present invention, a mobile station apparatus set to decode E-PDCCH can efficiently perform a random access procedure.

1 is a conceptual diagram of a wireless communication system according to an embodiment of the present invention. It is a figure which shows an example of the cell aggregation of this invention. It is a figure which shows the relationship between the PDCCH reception mode of this invention, a DCI format, and a search pace. It is a figure which shows the structure of the PDCCH candidate of this invention. It is a figure which shows the search space in the PDCCH area | region of this invention. It is a figure which shows the mapping method of PDCCH of this invention. It is a figure which shows the mapping method of E-PDCCH of this invention. It is a schematic block diagram which shows the structure of the base station apparatus 3 of this invention. It is a schematic block diagram which shows the structure of the mobile station apparatus 1 of this invention. It is a figure which shows the random access procedure of this invention. It is a figure which shows the relationship between the PDCCH reception mode in the 2nd Embodiment of this invention, a DCI format, and a search pace.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  First, the physical channel of the present invention will be described.

  FIG. 1 is a conceptual diagram of a wireless communication system according to an embodiment of the present invention. In FIG. 1, the radio communication system includes mobile station apparatuses 1 </ b> A to 1 </ b> C and a base station apparatus 3. FIG. 1 shows, in radio communication (downlink) from the base station apparatus 3 to the mobile station apparatuses 1A to 1C, a synchronization signal (Synchronization signal: SS), a downlink reference signal (Downlink Reference Signal: DL RS), and a physical broadcast channel (Physical Broadcast Channel: PBCH), Physical Downlink Control Channel (PDCCH), Enhanced Physical Downlink Control Channel (E-PDCCH), Physical Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH), Physical Multicast Channel (PMCH), Physical Control Format Indicator Channel (Physical Control Format Indicator Channel: PCFICH), Physical HARQ Indicator Channel (Physical Hybrid ARQ Indicator Channel: PHICH) Indicates.

  FIG. 1 illustrates uplink reference signals (UL RS), physical uplink control channels (Physical Uplink Control Channels) in radio communication (uplink) from the mobile station apparatuses 1A to 1C to the base station apparatus 3. : PUCCH), Physical Uplink Shared Channel (PUSCH), Physical Random Access Channel (PRACH). Hereinafter, the mobile station apparatuses 1A to 1C are referred to as the mobile station apparatus 1.

  The synchronization signal is a signal used for the mobile station apparatus 1 to synchronize the downlink frequency domain and time domain. The downlink reference signal is used by the mobile station apparatus 1 to synchronize the downlink frequency domain and time domain, the mobile station apparatus 1 is used to measure downlink reception quality, or the mobile station This is a signal used by the device 1 to perform PDSCH or PDCCH propagation path correction. The PBCH is a physical channel used for broadcasting system information (Broadcast Channel: BCH). System information transmitted on the PBCH is referred to as Master Information Block (MIB).

  PDCCH and E-PDCCH are used for transmitting downlink control information (Downlink Control Information: DCI) such as downlink assignment (also referred to as downlink assignment or downlink grant) and uplink grant (uplink grant). Physical channel. The E-PDCCH is mapped to the PDSCH region. The downlink assignment includes information on modulation scheme and coding rate for PDSCH (Modulation and Coding Scheme: MCS), information indicating radio resource allocation, TPC command (Transmission Power Control command) for PUCCH, and the like. The uplink grant includes information on a modulation scheme and coding rate for PUSCH, information indicating radio resource allocation, a TPC command for PUSCH, and the like.

  A plurality of formats are used for the downlink control information. The format of the downlink control information is called a DCI format (DCI format). For example, DCI format 0 is used for scheduling of a PUSCH of a single antenna port transmission scheme in a single cell. The DCI format 4 is used for PUSCH scheduling of a multi-antenna port transmission method in a single cell. The DCI format 1A is used for scheduling of PDSCH in a single antenna port transmission scheme or transmission diversity transmission scheme in a single cell. The DCI format 2 is used for scheduling of the PDSCH of the multi-antenna port transmission method in a single cell. DCI format 0 and DCI format 4 are uplink grants. DCI format 1A and DCI format 2 are downlink assignments.

  PDSCH is a physical channel used for transmitting paging information (Paging Channel: PCH), system information different from system information transmitted by PBCH, and downlink data (Downlink Shared Channel: DL-SCH). System information transmitted on the PDSCH is referred to as System Information Block (SIB). The PMCH is a physical channel used for transmitting information (Multicast Channel: MCH) related to MBMS (Multimedia Broadcast and Multicast Service). PCFICH is a physical channel used for transmitting information indicating an area where a PDCCH is arranged. The PHICH is a physical channel used for transmitting a HARQ indicator (response information) indicating success or failure of decoding of the uplink data received by the base station apparatus 3.

  When the base station apparatus 3 successfully decodes the uplink data included in the PUSCH, the HARQ indicator for the uplink data indicates ACK (ACKnowledgement), and the base station apparatus 3 decodes the uplink data included in the PUSCH. In case of failure, the HARQ indicator for the uplink data indicates NACK (Negative ACKnowledgement). A single PHICH transmits a HARQ indicator for a single uplink data. HARQ indicators for a plurality of uplink data included in the same PUSCH are transmitted using a plurality of PHICHs.

  The uplink reference signal is used for the base station device 3 to synchronize the uplink time domain, the base station device 3 is used to measure uplink reception quality, or the base station device 3 It is a signal used to perform propagation channel correction for PUSCH and PUCCH. Uplink reference signals include DMRS (Demodulation Reference Signal) that is time-multiplexed with PUSCH or PUCCH and SRS (Sounding Reference Signal) that is transmitted regardless of PUSCH and PUCCH.

  The PUCCH is channel state information (CSI) indicating downlink channel quality, a scheduling request (SR) indicating a request for radio resources of the PUSCH, and decoding of downlink data received by the mobile station apparatus 1. This is a physical channel used for transmitting uplink control information (Uplink Control Information: UCI), which is information used for communication control, such as ACK / NACK indicating success or failure of the communication.

  The PUSCH is a physical channel used to transmit uplink data (Uplink Shared Channel: UL-SCH) and uplink control information. PRACH is a physical channel used for transmitting a random access preamble. The PRACH is mainly intended for the mobile station apparatus 1 to synchronize with the base station apparatus 3 in the time domain. Besides, an initial connection establishment procedure, a handover procedure, a connection re-establishment (connection re-establishment) ) Procedure, synchronization for uplink transmission (timing adjustment), and uplink radio resource allocation request.

  Uplink data (UL-SCH) and downlink data (DL-SCH) are transport channels. The unit for transmitting uplink data by PUSCH and the unit for transmitting downlink data by PDSCH are called transport blocks (TB). The transport block is a unit of data delivered from the MAC (Media Access Control) layer to the physical layer, and HARQ (retransmission) control is performed for each transport block in the MAC layer. A unit of data handled in the MAC layer such as uplink data (UL-SCH) and downlink data (DL-SCH) is also referred to as a MAC PDU (Protocol Data Unit). In the physical layer, the transport block is mapped to a code word, and an encoding process is performed for each code word.

  Hereinafter, cell aggregation (carrier aggregation) of the present invention will be described.

  In cell aggregation, a plurality of serving cells are aggregated. FIG. 2 is a diagram illustrating an example of cell aggregation according to the present invention. In the cell aggregation process shown in FIG. 2, three serving cells (serving cell 1, serving cell 2, and serving cell 3) are aggregated. One serving cell among a plurality of aggregated serving cells is a primary cell (Pcell).

  The primary cell is a serving cell having the same function as the LTE Release-8 / 9 cell. The primary cell is a cell in which the mobile station device 1 has performed an initial connection establishment procedure, a cell in which the mobile station device 1 has started a connection re-establishment procedure, or a primary cell during a handover procedure. It is a cell designated as a cell.

  The serving cell excluding the primary cell is a secondary cell (Scell). Secondary cells are used to provide additional radio resources. The secondary cell is mainly used for transmission / reception of PDSCH, PUSCH, and PRACH. The secondary cell operates on a frequency different from that of the primary cell, and is set by the base station device 3 after the connection between the mobile station device 1 and the base station device 3 is established. The secondary cell is notified from the base station apparatus 3 to the mobile station apparatus 1 during the handover procedure. The mobile station apparatus 1 transmits PUCCH only in the primary cell, and does not transmit PUCCH in the secondary cell. The mobile station device 1 does not have to receive paging and system information transmitted on the PBCH and PDSCH of the secondary cell.

  The carrier corresponding to the serving cell in the downlink is a downlink component carrier (Downlink Component Carrier: DL CC), and the carrier corresponding to the serving cell in the uplink is an uplink component carrier (Uplink Component Carrier: UL CC). The carrier corresponding to the primary cell in the downlink is a downlink primary component carrier (DL PCC), and the carrier corresponding to the primary cell in the uplink is an uplink primary component carrier (UL PCC). ). The carrier corresponding to the secondary cell in the downlink is a downlink secondary component carrier (DL SCC), and the carrier corresponding to the secondary cell in the uplink is an uplink secondary component carrier (UL SCC). ).

  Each physical channel is transmitted in any one serving cell. That is, a single physical channel is not transmitted in multiple serving cells. One PDSCH can be transmitted in one serving cell (DL CC), and one PUSCH can be transmitted in one serving cell (UL CC). In each serving cell, PDCCH, PHICH, and PCFICH are frequency and time multiplexed. In each serving cell, a region where PDCCH, PHICH, and PCFICH are arranged and a region where PDSCH is arranged are time-multiplexed. The E-PDCCH is arranged in the PDSCH region. That is, the E-PDCCH region and the PDCCH / PHICH / PCFICH region are time-multiplexed, and the E-PDCCH region and the PDSCH region are frequency-multiplexed. The base station apparatus 3 can reuse an E-PDCCH region that is not used for E-PDCCH transmission for PDSCH transmission. In each serving cell, the region where the PUCCH is arranged and the region where the PUSCH is arranged are frequency-multiplexed.

  The downlink control information used for scheduling of the primary cell PDSCH or PUSCH is transmitted on the primary cell PDCCH or E-PDCCH. For each secondary cell, the base station apparatus 3 sets a serving cell in which downlink control information used for scheduling of the secondary cell is transmitted by PDCCH or E-PDCCH.

  The base station apparatus 3 has, for each serving cell, information indicating a serving cell to which the downlink assignment and the uplink grant correspond to the downlink assignment and the uplink grant transmitted in the serving cell (carrier indicator: Carrier Indicator). Is notified to the mobile station apparatus. The PHICH is transmitted in the serving cell to which the uplink grant used for scheduling of PUSCH to which the PHICH corresponds is transmitted.

  Hereinafter, the search space of the present invention will be described.

  The mobile station apparatus 1 monitors a set of PDCCH candidates (candidates). The PDCCH candidate is a candidate on which PDCCH or E-PDCCH may be arranged and transmitted by the base station apparatus 3. Monitoring means that the mobile station apparatus 1 attempts to decode each of the PDCCH and E-PDCCH in the set of PDCCH candidates according to all the DCI formats to be monitored. A search space is defined by a set of PDCCH candidates.

  The common search space is a search space used for transmitting downlink control information for a plurality of mobile station apparatuses 1 and downlink control information for a specific mobile station apparatus 1. The specific search space (user equipment specific search space) is a specific search space (user equipment specific search space) used for transmission of downlink control information to a specific mobile station apparatus 1. The common search space is configured in the PDCCH region of the primary cell and is not configured in the secondary cell. The unique search space is configured in the PDCCH region or the E-PDCCH region.

  When cell aggregation is set, a unique search space corresponding to each serving cell is configured. The unique search space corresponding to the primary cell is configured in the primary cell. The unique search space corresponding to the secondary cell is configured in any one serving cell. The base station apparatus 3 can set in which serving cell the unique search space corresponding to the secondary cell is configured.

  For transmission of downlink control information to a specific mobile station apparatus 1, a C-RNTI (Cell-Radio Network Temporary Identifier) assigned by the base station apparatus 3 to the mobile station apparatus 1 is used. Specifically, CRC parity bits generated based on the downlink control information are added to the downlink control information, and after the addition, the CRC parity bits are scrambled by C-RNTI. The CRC parity bit and C-RNTI are 16 bits. The base station apparatus 3 encodes the downlink control information to which the CRC parity bits are added, and adjusts the number of encoded bits according to the number of control channel elements used for transmission of the downlink control information and the modulation scheme.

  One control channel element is used to transmit 36 modulation symbols. When a QPSK (Quadrature Phase Shift Keying) modulation scheme is applied to the downlink control information (PDCCH), the base station apparatus 3 transmits 72-bit downlink control information to the mobile station apparatus using one control channel element. 1 can be transmitted.

  The mobile station apparatus 1 sets, for each serving cell, whether the specific search space in the PDCCH area or the search space in the E-PDCCH area is monitored according to the radio resource control signal received from the base station apparatus 3. A mode in which the mobile station device 1 monitors the unique search space in the PDCCH region in a single serving cell is referred to as a PDCCH reception mode 1. A mode in which the mobile station device 1 monitors the unique search space in the E-PDCCH region in a single serving cell is referred to as a PDCCH reception mode 1. The base station device 3 sets the PDCCH reception mode 1 or the PDCCH reception mode 2 for the mobile station device 1 using the radio resource control signal. The mobile station device 1 sets the PDCCH reception mode 1 or the PDCCH reception mode 2 according to the radio resource control signal received from the base station device 3.

  FIG. 3 is a diagram showing the relationship among the PDCCH reception mode, the DCI format, and the search pace according to the present invention. In FIG. 3, only the downlink control information (DCI format) for a specific mobile station apparatus 1 is shown for the sake of simplicity of explanation. The mobile station apparatus 1 decodes the PDCCH according to the combination of the PDCCH reception mode, DCI format, and search space of FIG. For example, the mobile station device 1 in the PDCCH reception mode 1 tries to decode the PDCCH using the common search space and the unique search space in the PDCCH region, assuming that the DCI format 0 is transmitted by the PDCCH by the base station device 3.

  In the mobile station apparatus 1, when CRC parity bits are scrambled by the same RNTI (Radio Network Temporary Identifier), mapped to the same search space, and the number of bits of DCI format 0 and DCI format 1A for scheduling the same serving cell is different Adds bits having a value of 0 until the payload size of the DCI format with a small number of bits is the same as the payload size of the DCI format with a large number of bits. By this processing, CRC parity bits are scrambled by the same RNTI, mapped to the same search space, and the payload size of DCI format 0 and the payload size of DCI format 1A for scheduling the same serving cell become the same. The decoding process of DCI format 0 and DCI format 1 by 1 can be simplified.

  Note that the above process may not be performed for the DCI format 1A corresponding to the first slot of the unique search space of the E-PDCCH region and the DCI format 0 corresponding to the second slot of the unique search space of the E-PDCCH region. That is, in PDCCH reception mode 2, the payload size of DCI format 0 corresponding to the common search space and the payload size of DCI format 1A are the same, but the DCI format corresponding to the first slot of the unique search space in the E-PDCCH region The payload size of 1A and the payload size of DCI format 0 corresponding to the second slot of the unique search space in the E-PDCCH region may not be the same.

  FIG. 4 is a diagram showing a configuration of PDCCH candidates according to the present invention. A PDCCH candidate corresponding to a search space in the PDCCH region is configured by one or a continuous control channel element (Control Channel element: CCE). A PDCCH candidate composed of n consecutive control channel elements starts only on a control channel element having a number (index) whose remainder is 0 when the control channel element number (index) is divided by n. A PDCCH candidate corresponding to a search space in the E-PDCCH region is composed of one or continuous virtual resource blocks (VRB). A PDCCH candidate composed of n consecutive virtual resource blocks starts only on a virtual resource block having a number (index) in which the remainder obtained by dividing the number (index) of the virtual resource block by n is 0.

  The number of control channel elements or the number of virtual resource blocks constituting the PDCCH candidate is referred to as an aggregation level. The aggregation level of the PDCCH candidate is 1, 2, 4, or 8. A search space is configured for each aggregation level of PDCCH candidates. The aggregation levels of PDCCH candidates corresponding to the common search space are 4 and 8. The aggregation levels of PDCCH candidates corresponding to the unique search space are 1, 2, 4, and 8.

  For example, in FIG. 4, an aggregation level 8 PDCCH candidate is composed of 0 to 7 control channel elements or virtual resource blocks and 8 to 15 control channel elements or virtual resource blocks. In FIG. 4, aggregation level 4 PDCCH candidates are 0 to 3 control channel elements or virtual resource blocks, 4 to 7 control channel elements or virtual resource blocks, and 8 to 11 control channel elements or virtual resource blocks. , 12 to 15 control channel elements or virtual resource blocks.

  An aggregation level 1 search space is defined by six PDCCH candidates. An aggregation level 2 search space is defined by six PDCCH candidates. An aggregation level 4 search space is defined by two PDCCH candidates. Aggregation level 8 PDCCH candidates are defined by two PDCCH candidates.

  FIG. 5 is a diagram showing a search space in the PDCCH region of the present invention. The horizontal axis is a number (indicator) for identifying the control channel element. A unit surrounded by a thick line in FIG. 4 is a PDCCH candidate, and a PDCCH candidate hatched with a diagonal line in FIG. 4 is a PDCCH candidate corresponding to a unique search space. In FIG. 4, PDCCH candidates hatched in gray are PDCCH candidates corresponding to the common search space.

  The common search space is composed of predetermined control channel elements. The common search space at aggregation level 4 and the common search space at aggregation level 8 start with the control channel element numbered 0. The first number of the control channel elements constituting the unique search space corresponding to the PDCCH region is determined from the total number of control channel elements in the PDCCH region of the subframe, C-RNTI, the slot number in the radio frame, and the aggregation level. Is done. In the PDCCH region, some or all of search spaces of different aggregation levels for the same mobile station apparatus 1 may overlap. In the PDCCH region, the common search space and the unique search space for the same mobile station device 1 may partially or entirely overlap.

  FIG. 6 shows a PDCCH mapping method according to the present invention. In FIG. 6, reference numeral 600 denotes one control channel element used for transmission of downlink control information. Reference numeral 601 indicates control channel elements that are not used for transmission of modulation symbols for downlink control information. Numbers 602 and 603 indicate two control channel elements used for transmission of downlink control information. Reference numeral 604 denotes a PDCCH / PHICH / PCFICH region in a subframe within a radio frame of a certain component carrier. Numbers 605 and 606 indicate PDSCH regions in subframes in a radio frame of a certain component carrier. Reference numeral 607 denotes an E-PDCCH region in a subframe in a radio frame of a certain component carrier.

  One control channel element is used to transmit 36 modulation symbols. One control channel element is composed of nine mini-CCEs. One mini-CCE is composed of four modulation symbols. One mini-CCE is mapped to one resource element group. One resource element group is composed of four resource elements. That is, one modulation symbol is mapped to one resource element.

  The base station apparatus 3 interleaves the control channel elements numbered 600 to 603 in mini-CCE units. The base station apparatus 3 cyclically shifts the interleaved mini-CCE in units of mini-CCE. The base station apparatus 3 maps the cyclic-shifted mini-CCE to the resource element group in the PDCCH / PHICH / PCFICH area 604. The base station apparatus 3 maps the PDCCH mini-CCE to resource element groups other than the resource element group to which PHICH and PCFICH are mapped.

  FIG. 7 is a diagram illustrating an E-PDCCH mapping method according to the present invention. In FIG. 7, number 700 indicates two virtual resource blocks in the first slot used for transmission of downlink control information (downlink assignment). Reference numeral 701 denotes a virtual resource block of the first slot that is not used for transmission of a modulation symbol of downlink control information (downlink assignment). Reference numeral 702 indicates four virtual resource blocks in the first slot used for transmission of downlink control information (downlink assignment). Reference numeral 703 indicates eight virtual resource blocks in the second slot used for transmission of downlink control information (uplink grant).

  Number 704 and number 705 indicate virtual resource blocks set by the base station apparatus 3 for transmission of E-PDCCH. Reference numeral 706 denotes a virtual resource block in the first slot. Reference numeral 707 denotes a virtual resource block in the second slot. Reference numeral 710 indicates a physical resource block of the first slot. Reference numeral 711 indicates a physical resource block of the second slot. Reference numeral 712 indicates a PDCCH / PHICH / PCFICH region in a subframe within a radio frame of a certain component carrier. Numbers 713, 715, and 717 indicate PDSCH regions in subframes within a radio frame of a certain component carrier. Reference numerals 714 and 716 indicate E-PDCCH regions in subframes within a radio frame of a certain component carrier. Reference numeral 716 indicates the bandwidth of the component carrier.

  The base station device 3 sets virtual resource blocks that can be used for E-PDCCH transmission, and notifies the mobile station device 1 of the set virtual resource blocks (704 and 705). The set virtual resource blocks are numbered sequentially from 0. The set virtual resource block number 0 corresponds to the set virtual resource block having the smallest virtual resource block number. In FIG. 7, the set virtual resource blocks (704 and 705) are eight virtual resource blocks whose virtual resource block numbers are 5, 6, 7, 8, 18, 19, 20, and 21.

  In the E-PDCCH region, the first virtual resource block constituting the unique search space corresponding to each aggregation level is a virtual resource block whose set virtual resource block number is 0. That is, the unique search space for each aggregation level starts from a virtual resource block whose set virtual resource block number is 0.

  The base station apparatus 3 maps the downlink control information (downlink assignment) (700 and 702) to the virtual resource block in which the first slot is set, and sets the downlink control information (uplink grant) (703) to the first Map to a virtual resource block with 2 slots.

  The base station apparatus 3 maps the virtual resource block to the physical resource block having the same number as the virtual resource block number. Note that the virtual resource block in the first slot and the virtual resource block in the second slot having the same virtual resource block number may be mapped to physical resource blocks having different physical resource block numbers.

  The apparatus configuration of the present invention will be described below.

  FIG. 8 is a schematic block diagram showing the configuration of the base station apparatus 3 of the present invention. As illustrated, the base station apparatus 3 includes an upper layer processing unit 301, a control unit 303, a reception unit 305, a transmission unit 307, and a transmission / reception antenna 309. The upper layer processing unit 301 includes a radio resource control unit 3011, a scheduling unit 3013, and a random access control unit 3015. The reception unit 305 includes a decoding unit 3051, a demodulation unit 3053, a demultiplexing unit 3055, a wireless reception unit 3057, and a channel measurement unit 3059. The transmission unit 307 includes an encoding unit 3071, a modulation unit 3073, a multiplexing unit 3075, a radio transmission unit 3077, and a downlink reference signal generation unit 3079.

  The upper layer processing unit 301 includes a medium access control (MAC) layer, a packet data integration protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (Radio). Resource Control (RRC) layer processing. Upper layer processing section 301 generates control information for controlling receiving section 305 and transmitting section 307 and outputs the control information to control section 303.

  The radio resource control unit 3011 included in the upper layer processing unit 301 generates downlink data (transport block), RRC signal, and MAC CE (Control Element) arranged in the downlink PDSCH, or acquires from the upper node. And output to the transmission unit 307. Further, the radio resource control unit 3011 manages various setting information of each mobile station apparatus 1. For example, the radio resource control unit 3011 performs management of the PDCCH reception mode, management of the serving cell set in the mobile station apparatus 1, and the like.

  The scheduling unit 3013 included in the higher layer processing unit 301 performs PDSCH and PUSCH scheduling, and notifies the control information generation unit 3015 of the scheduling result.

  A random access control unit 3015 included in the higher layer processing unit 301 controls random access. For example, the random access control unit 3015 generates a random access response including a TA command and Temporary C-RNTI for the received random access preamble. Details of the random access procedure of the present invention will be described later.

  The control unit 303 generates a control signal for controlling the reception unit 305 and the transmission unit 307 based on the control information from the higher layer processing unit 301. The control unit 303 outputs the generated control signal to the reception unit 305 and the transmission unit 307 and controls the reception unit 305 and the transmission unit 307.

  The reception unit 305 separates, demodulates, decodes, and decodes the PUCCH, PUSCH, PRACH, and uplink reference signal received from the mobile station apparatus 1 via the transmission / reception antenna 309 according to the control signal input from the control unit 303 The information is output to the upper layer processing unit 301. The receiving unit 305 measures the state of the uplink channel from the received uplink signal and outputs the measurement result to the higher layer processing unit 301.

  The transmission unit 307 generates a downlink reference signal according to the control signal input from the control unit 303, encodes and modulates the HARQ indicator, downlink control information, and downlink data input from the higher layer processing unit 301. Then, the PHICH, PDCCH, PDSCH, and downlink reference signal are multiplexed, and the signal is transmitted to the mobile station device 1 via the transmission / reception antenna 309.

  FIG. 9 is a schematic block diagram showing the configuration of the mobile station apparatus 1 of the present invention. As illustrated, the mobile station apparatus 1 includes an upper layer processing unit 101, a control unit 103, a receiving unit 105, a transmitting unit 107, and a transmission / reception antenna 109. The upper layer processing unit 101 includes a radio resource control unit 1011, a scheduling unit 1013, and a random access control unit 1015. The reception unit 105 includes a decoding unit 1051, a demodulation unit 1053, a demultiplexing unit 1055, a radio reception unit 1057, and a channel measurement unit 1059. The transmission unit 107 includes an encoding unit 1071, a modulation unit 1073, a multiplexing unit 1075, a radio transmission unit 1077, and an uplink reference signal generation unit 1079.

  Upper layer processing section 101 outputs uplink data generated by a user operation or the like to transmitting section 107. The upper layer processing unit 101 includes a medium access control (MAC) layer, a packet data integration protocol (PDCP) layer, a radio link control (Radio Link Control: RLC) layer, and radio resource control. Process the (Radio Resource Control: RRC) layer. In addition, upper layer processing section 101 generates control information for controlling receiving section 105 and transmitting section 107 and outputs the control information to control section 103.

  The radio resource control unit 1011 included in the higher layer processing unit 101 manages various setting information of the own device. For example, the radio resource control unit 1011 performs management of the PDCCH reception mode and management of the serving cell. The radio resource control unit 1011 generates information arranged in each uplink channel and outputs the information to the transmission unit 107.

  The scheduling unit 1013 included in the higher layer processing unit 101 controls the receiving unit 105 via the control unit 103 so as to receive the PDSCH according to the downlink assignment input from the receiving unit 105. The scheduling unit 1013 controls the transmission unit 107 via the control unit 103 so as to transmit the PUSCH according to the uplink grant or the random access response grant input from the reception unit 105.

  A random access control unit 1015 included in the upper layer processing unit 101 controls random access. For example, the random access control unit 1015 starts the random access procedure according to the information for instructing the start of the random access procedure received from the base station device 3. Details of the random access procedure of the present invention will be described later.

  The control unit 103 generates a control signal for controlling the reception unit 105 and the transmission unit 107 based on the control information from the higher layer processing unit 101. Control unit 103 outputs the generated control signal to receiving unit 105 and transmitting unit 107 to control receiving unit 105 and transmitting unit 107.

  The receiving unit 105 separates, demodulates, decodes, and decodes the PHICH, PDCCH, PDSCH, and downlink reference signal received from the base station apparatus 3 via the transmission / reception antenna 109 according to the control signal input from the control unit 103. The information is output to the upper layer processing unit 101. The receiving unit 105 measures the state of the uplink channel from the received downlink signal, and outputs the measurement result to the higher layer processing unit 101.

  The transmission unit 107 generates an uplink reference signal in accordance with the control signal input from the control unit 103, encodes and modulates the uplink data (transport block) input from the higher layer processing unit 101, PRACH, PUCCH, PUSCH, and the generated uplink reference signal are multiplexed and transmitted to base station apparatus 3 via transmission / reception antenna 109.

  The random access procedure of the present invention will be described below.

  FIG. 10 is a diagram showing a random access procedure of the present invention. The mobile station apparatus 1 receives configuration information indicating a set of physical random access channel (PRACH) resources of the primary cell and configuration information indicating a set of PRACH resources of the secondary cell from the base station apparatus 3, A set of PRACH resources is set (800). The PRACH resource is expressed by a radio frame number, a subframe number in the radio frame, and a physical resource block number.

  The base station apparatus 3 can transmit the downlink control information (information instructing the start of the random access procedure) instructing transmission of the PRACH using the PDCCH or the E-PDCCH (801). Hereinafter, PDCCH used for transmission of downlink control information instructing transmission of PRACH is referred to as PDCCH order (random access message 0). Here, a combination of DCI format 1A and C-RNTI (Cell-Radio Network Temporary Identifier) is used for transmission of the downlink control information. The PDCCH order for the primary cell is transmitted only in the primary cell. The PDCCH order for the secondary cell is transmitted only in the serving cell set by the base station apparatus 3 to be used for scheduling of the secondary cell. The mobile station device 1 itself can also initiate a random access procedure.

  The mobile station apparatus 1 selects one PRACH resource from the set PRACH resource set, and transmits a random access preamble (random access message 1) to the base station apparatus using the selected PRACH resource (802). Here, the mobile station apparatus 1 may transmit a plurality of random access preambles simultaneously (in the same subframe) using one PRACH resource of each serving cell. For example, the mobile station apparatus 1 may transmit a plurality of random access preambles simultaneously using the PRACH resource of the primary cell and the PRACH resource of the secondary cell.

  The PRACH of the secondary cell is used to control the amount of timing adjustment for the physical uplink channel of the secondary cell. Also, the mobile station apparatus 1 transmits the PRACH of the secondary cell only when receiving the PDCCH order for the secondary cell from the base station apparatus 3. The mobile station apparatus 1 transmits the PRACH of the primary cell to request the uplink radio resource allocation, but does not transmit the PRACH of the secondary cell to request the uplink radio resource allocation.

  The base station apparatus 3 receives the random access preamble from the mobile station apparatus 1 and calculates the amount of timing adjustment for the physical uplink channel of the serving cell from the received random access preamble. In response to the received random access preamble, the base station apparatus 3 is a random access preamble identifier (Random Access Preamble identifier) corresponding to the received random access preamble and information indicating the amount of timing adjustment for the physical uplink channel (TA command) : Timing Advance command), a random access response (random access message 2) is transmitted to the mobile station apparatus 1 (803). If the random access response includes a random access preamble identifier corresponding to the random access preamble transmitted by the mobile station apparatus 1, the mobile station apparatus 1 considers that the random access response has been successfully received, and receives the received TA command. Process.

  PDSCH is used for transmission of the random access response. E-PDCCH or PDCCH is used for transmission of downlink control information used for scheduling of the PDSCH. In response to the random access preamble received by the primary cell, the base station apparatus 3 transmits a random access response using the PDSCH of the primary cell. Further, the base station apparatus 3 transmits downlink control information (DCI format) used for scheduling of the random access response of the primary cell using the E-PDCCH or PDCCH of the primary cell. Here, RA-RNTI (Random Access-Radio Network Temporary Identifier) is used for transmission of the downlink control information.

  Furthermore, the base station apparatus 3 transmits a random access response using the PDSCH of the primary cell or the PDSCH of the secondary cell, corresponding to the random access preamble received by the secondary cell. Moreover, the base station apparatus 3 transmits the downlink control information (DCI format) used for scheduling of PDSCH of the primary cell to which a random access response is transmitted by E-PDCCH or PDCCH of the primary cell. Also, the base station apparatus 3 transmits the downlink control information used for scheduling the PDSCH of the secondary cell to which the random access response is transmitted to the base station apparatus 3 so as to be used for the scheduling of the secondary cell to which the random access response is transmitted. It transmits with E-PDCCH or PDCCH of the set serving cell, or E-PDCCH or PDCCH of the secondary cell to which the random access response is transmitted. Here, for transmission of the downlink control information, RA-RNTI (Random Access-Radio Network Temporary Identifier) or C-RNTI (Cell-Radio Network Temporary Identifier) is used.

  The base station device 3 transmits a random access response including a random access preamble identifier and a TA command corresponding to the random access preamble received by the secondary cell to the mobile station device 1. Here, the base station apparatus 3 may transmit a random access response to the mobile station apparatus 1 without including a random access preamble identifier corresponding to the random access preamble received by the secondary cell.

  Hereinafter, in this embodiment, the random access response corresponding to the random access preamble received in the primary cell is referred to as a random access response for the primary cell, and the random access response corresponding to the random access preamble received in the secondary cell is referred to as the secondary cell. Also referred to as a random access response.

  Further, when the mobile station device 1 does not receive a random access response for the random access preamble within a certain period (in the random access response window) after transmitting the random access preamble, the mobile station device 1 retransmits the random access preamble. To do. The retransmission of the random access preamble is performed in the same serving cell as the serving cell in which the random access preamble is transmitted.

  Here, the random access response for the primary cell includes a random access response grant. The random access response grant is used for PUSCH scheduling and includes a TPC command. That is, the random access response for the primary cell includes a TPC command. Here, the random access response grant may be included in the random access response for the secondary cell, or may not be included in the random access response for the secondary cell.

  The base station apparatus 3 transmits information instructing the start of the random access procedure to the mobile station apparatus 1 using PDCCH or E-PDCCH, and receives the random access preamble transmitted by the mobile station apparatus 1 using the physical random access channel according to the information. Then, information used for scheduling of the random access response for the received random access preamble is transmitted to the mobile station apparatus 1 using the PDCCH, and the random access response is transmitted to the mobile station apparatus 1 using the PDSCH.

  When the base station device 3 transmits information instructing the start of the random access procedure to the mobile station device 1 using the PDCCH, the base station device 3 uses the PDCCH to transmit information used for scheduling the random access response to the received random access preamble. 1 and information for instructing the start of a random access procedure is transmitted to the mobile station apparatus 1 by E-PDCCH, information used for scheduling of a random access response to the received random access preamble is transmitted by E-PDCCH. Transmit to mobile station apparatus 1. However, the base station apparatus 3 does not notify the mobile station apparatus 1 of the random access preamble identifier when the information instructing the start of the random access procedure is transmitted by E-PDCCH, and the mobile station apparatus 1 does not access the random access procedure. When a preamble is selected at random, information used for scheduling of a random access response for the received random access preamble is transmitted to the mobile station apparatus 1 using the PDCCH.

  When the mobile station apparatus 1 receives information instructing the start of the random access procedure from the base station apparatus 3 using the PDCCH, the mobile station apparatus 1 uses the PDCCH to transmit information used for scheduling the random access response to the transmission of the random access preamble. 3, when the information instructing the start of the random access procedure is received from the base station apparatus 3 by E-PDCCH, the information used for scheduling the random access response to the transmission of the random access preamble is transmitted by E-PDCCH. Received from the base station apparatus 3. However, when the mobile station apparatus 1 receives the information for instructing the start of the random access procedure by the E-PDCCH, the mobile station apparatus 1 is not notified of the random access preamble identifier from the base station apparatus 3, and the mobile station apparatus 1 performs random access. When the preamble is selected at random, information used for scheduling of a random access response for the received random access preamble is received from the base station apparatus 3 by PDCCH.

  The mobile station apparatus 1 receives information instructing the start of a random access procedure from the base station apparatus 3 using PDCCH or E-PDCCH, and transmits a random access preamble to the base station apparatus 3 using a physical random access channel according to the information. Then, information used for scheduling of a random access response for transmission of a random access preamble may be received from the base station apparatus 3 using PDCCH, and a random access response may be received from the base station apparatus 3 using PDSCH according to the information.

  When the mobile station apparatus 1 is notified of the random access preamble identifier from the base station apparatus 3 by the PDCCH order or radio resource control signal, the mobile station apparatus 1 has successfully received the random access response. Later, the random access procedure is considered complete.

  Further, when the random access preamble identifier has not been notified from the base station apparatus 3 and the mobile station apparatus 1 has randomly selected the random access preamble, the mobile station apparatus 1 has successfully received the random access response. Later, the random access message 3 is transmitted to the base station apparatus 3 using a physical uplink shared channel (PUSCH) (804), and the random access message 4 is received from the base station apparatus 3 (805). The random access message 3 includes a MAC (Medium Access Control) CE (Control Element) or CCCH (Common Control Channel) SDU (Service Data Unit) indicating the C-RNTI of the mobile station apparatus 1. CCCH is a logical channel. The uplink CCCH is used for transmitting a connection request message or a connection re-establishment request message. In the random access procedure of the secondary cell, since the random access preamble identifier is included in the PDCCH order for the secondary cell, the random access message 3 and the random access message 4 are not transmitted / received.

  When the mobile station apparatus 1 includes a C-RNTI MAC (Medium Access Control) CE (Control Element) in the random access message 3, E-PDCCH or PDCCH is used for transmission of the random access message 4. Specifically, the mobile station apparatus 1 starts a random access procedure, C-RNTI is used for transmission of E-PDCCH or PDCCH, and downlink control information for initial transmission of PUSCH is the E-PDCCH or the If it is included in the PDCCH, the mobile station apparatus 1 considers that the random access message 4 has been successfully received, and assumes that the random access procedure has been completed. Further, when the random access procedure is started by the PDCCH order and C-RNTI is used for transmission of E-PDCCH or PDCCH, the mobile station apparatus 1 regards that the random access message 4 has been successfully received, Consider the access procedure complete.

  When the mobile station apparatus 1 includes the CCCH SDU in the random access message 3, PDCCH and PDSCH are used for transmission of the random access message 4. Specifically, the mobile station apparatus 1 receives the PDSCH according to the DCI format 1A included in the PDCCH transmitted using Temporary C-RNTI, and the identifier (UE contention resolution identity) included in the MAC CE received on the PDSCH. ) And the CCCH SDU transmitted in the random access message 3 match, the mobile station apparatus 1 considers that the random access message 4 has been successfully received, sets the value of Temporary C-RNTI to C-RNTI, Consider random access procedure complete. The value of Temporary C-RNTI is notified from the base station apparatus 3 to the mobile station apparatus 1 using a random access response. At this time, the mobile station apparatus 1 monitors the DCI format 1A transmitted using the Temporary C-RNTI with the common search space of the PDCCH area and the unique search space of the PDCCH area determined based on the Temporary C-RNTI. .

  That is, when the mobile station apparatus 1 in the PDCCH reception mode 2 includes the C-RNTI MAC CE in the random access message 3, the C-RNTI is used for transmission of the E-PDCCH or PDCCH, and the common search space Or, when the DCI format 0 of the second slot of the unique search space of the E-PDCCH region or the DCI format 4 of the second slot of the unique search space of the E-PDCCH region is included in the E-PDCCH or PDCCH, random access It is assumed that message 4 has been successfully received and that the random access procedure has been completed.

  In addition, when the random access message 3 includes the CCCH SDU, the mobile station device 1 in the PDCCH reception mode 2 receives the PDSCH according to the DCI format 0 included in the PDCCH transmitted using the Temporary C-RNTI. If the identifier (UE contention resolution identity) included in the MAC CE received on the PDSCH matches the CCCH SDU transmitted in the random access message 3, it is assumed that the random access message 4 has been successfully received, and the Temporary C- Set the value of RNTI to C-RNTI and consider the random access procedure complete.

  Thereby, the mobile station apparatus 1 set to decode the E-PDCCH can perform the random access procedure efficiently.

  Hereinafter, the second embodiment of the present invention will be described in detail.

  In the first embodiment of the present invention, the mobile station apparatus 1 in the PDCCH reception mode 1 monitors the DCI format 0 and the DCI format 1A having a common payload size in the unique search space of the PDCCH region. The mobile station apparatus 1 monitors the DCI format 1A in the first slot of the unique search space in the E-PDCCH region, and monitors the DCI format 0 in the second slot of the unique search space in the E-PDCCH region. As a result, the reception process in the PDCCH reception mode 2 is more complicated than in the PDCCH reception mode 1.

  FIG. 11 is a diagram showing the relationship among the PDCCH reception mode, the DCI format, and the search pace in the second embodiment of the present invention. 3 is compared with FIG. 11 in that DCI format 1A is monitored only in the common search space. In the second embodiment of the present invention, in the PDCCH reception mode 2, the DCI format 1A is monitored only in the common search space, whereby the reception process in the PDCCH reception mode 2 is simplified.

  The base station apparatus 3 transmits the DCI format 1A instructing the mobile station apparatus 1 in the PDCCH reception mode 2 to start the random access procedure in the common search space in the PDCCH area. That is, the base station apparatus 3 transmits the DCI format 1A instructing the start of the random access procedure to the mobile station apparatus 1 in the PDCCH reception mode 2 using only the PDCCH, and does not transmit using the E-PDCCH. Similarly, the base station apparatus 3 may transmit the random access message 4 to the mobile station apparatus 1 in the PDCCH reception mode 2 using only the common search space, and may not transmit using the E-PDCCH.

  Thereby, the mobile station apparatus 1 set to decode the E-PDCCH can perform the random access procedure efficiently.

  Hereinafter, the third embodiment of the present invention will be described in detail.

  In the third embodiment of the present invention, the base station apparatus 3 transmits downlink control information instructing the start of a random access procedure for the primary cell on the PDCCH of the primary cell, regardless of the PDCCH reception mode of the primary cell. When the serving cell used for the scheduling of the secondary cell that instructs the start of the random access procedure is the primary cell or the secondary cell in the PDCCH reception mode 1, the base station device 3 instructs the start of the random access procedure for the secondary cell. Downlink control information to be transmitted is transmitted by PDCCH. When the serving cell used for scheduling of the secondary cell instructing the start of the random access procedure is a secondary cell in the PDCCH reception mode 2, the base station apparatus 3 instructs the downlink to instruct the start of the random access procedure for the secondary cell. Control information is transmitted by E-PDCCH.

  In the primary cell, the mobile station apparatus 1 monitors, on the PDCCH, downlink control information instructing the start of a random access procedure for the primary cell and the secondary cell in which the primary cell can perform physical channel scheduling. In the secondary cell of the PDCCH reception mode 1, the mobile station device 1 monitors, on the PDCCH, downlink control information that instructs the start of a random access procedure for the secondary cell in which the secondary cell can perform physical channel scheduling. In the secondary cell in PDCCH reception mode 2, the mobile station apparatus 1 monitors, on the E-PDCCH, downlink control information instructing the start of a random access procedure for the secondary cell in which the secondary cell can perform physical channel scheduling. .

  That is, the PDCCH order transmitted in the primary cell is transmitted only on the PDCCH regardless of the PDCCH reception mode of the primary cell and the PDCCH reception mode of the secondary cell corresponding to the PDCCH order. As a result, the random access procedure using the conventional PDCCH is simplified in the primary cell, thereby simplifying the random access procedure of the primary cell, while the secondary cell uses the PDCCH or E-PDCCH depending on the PDCCH reception mode. The random access procedure can be performed flexibly. Thereby, the mobile station apparatus 1 set to decode the E-PDCCH can efficiently perform the random access procedure.

  The base station device 3 transmits downlink control information for instructing the start of the random access procedure for the primary cell using the PDCCH of the primary cell, regardless of the PDCCH reception mode of the primary cell, and instructs the start of the random access procedure. When the serving cell used for scheduling of the secondary cell is a serving cell (primary cell or secondary cell) in PDCCH reception mode 1, downlink control information for instructing the start of a random access procedure for the secondary cell is transmitted on the PDCCH, When the serving cell used for scheduling of the secondary cell instructing the start of the random access procedure is the primary cell in PDCCH reception mode 2 The downlink control information for instructing the start of the random access procedure for the secondary cell is transmitted by PDCCH or E-PDCCH, and the serving cell used for scheduling of the secondary cell instructing the start of the random access procedure is the secondary in PDCCH reception mode 2. In the case of a cell, downlink control information instructing the start of a random access procedure for the secondary cell may be transmitted by E-PDCCH.

  At this time, the mobile station apparatus 1 monitors the downlink control information instructing the start of the random access procedure for the primary cell by the PDCCH of the primary cell, regardless of the PDCCH reception mode of the primary cell, and starts the random access procedure. When the serving cell used for scheduling of the designated secondary cell is a serving cell (primary cell or secondary cell) in PDCCH reception mode 1, downlink control information for instructing the start of a random access procedure for the secondary cell is monitored on the PDCCH. And the serving cell used for scheduling of the secondary cell instructing the start of the random access procedure is the primary cell in the PDCCH reception mode 2 In this case, the downlink control information instructing the start of the random access procedure for the secondary cell is monitored by the PDCCH or the E-PDCCH, and the serving cell used for scheduling of the secondary cell instructing the start of the random access procedure is received by the PDCCH. In the case of a mode 2 secondary cell, downlink control information instructing the start of a random access procedure for the secondary cell may be monitored on the E-PDCCH.

  In other words, the mobile station apparatus 1 always monitors the PDCCH order for the primary cell by the PDCCH of the primary cell, and the physical channel for monitoring the PDCCH order for the secondary cell is transmitted with downlink control information used for scheduling of the secondary cell. To be determined according to the serving cell and the PDCCH reception mode of the serving cell.

  A program that operates in the base station apparatus 3 and the mobile station apparatus 1 related to the present invention is a program (computer function) that controls a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiments related to the present invention. Program). Information handled by these devices is temporarily stored in RAM (Random Access Memory) during the processing, and then stored in various ROMs such as Flash ROM (Read Only Memory) and HDD (Hard Disk Drive). Reading, correction, and writing are performed by the CPU as necessary.

  In addition, you may make it implement | achieve the mobile station apparatus 1 in the embodiment mentioned above, and a part of base station apparatus 3 with a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed.

  Here, the “computer system” is a computer system built in the mobile station apparatus 1 or the base station apparatus 3 and includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system.

  Furthermore, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In such a case, a volatile memory inside a computer system serving as a server or a client may be included and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  Further, part or all of the mobile station device 1 and the base station device 3 in the above-described embodiment may be realized as an LSI that is typically an integrated circuit, or may be realized as a chip set. Each functional block of the mobile station device 1 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.

  As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

1 (1A, 1B, 1C) Mobile station apparatus 3 Base station apparatus 101 Upper layer processing section 103 Control section 105 Reception section 107 Transmission section 301 Upper layer processing section 303 Control section 305 Reception section 307 Transmission section 1011 Radio resource control section 1013 Scheduling Unit 1015 random access control unit 3011 radio resource control unit 3013 scheduling unit 3015 random access control unit

Claims (19)

In a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus,
Receiving the first information instructing the start of a random access procedure from the base station apparatus on the extended physical downlink control channel;
According to the first information, a random access preamble is transmitted to the base station apparatus through a physical random access channel,
Receiving second information used for scheduling of random access response to transmission of the random access preamble from the base station apparatus on the physical downlink control channel;
The mobile station apparatus, wherein the random access response is received from the base station apparatus through a physical downlink shared channel according to the second information. In a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus,
Receiving from the base station apparatus first information instructing start of a random access procedure on the physical downlink control channel or the extended physical downlink control channel;
According to the first information, a random access preamble is transmitted to the base station apparatus through a physical random access channel,
When the first information is received on the physical downlink control channel, the base station apparatus transmits second information used for scheduling of a random access response to transmission of the random access preamble on the physical downlink control channel. Received from
When the first information is received on the extended physical downlink control channel, the second information is received from the base station apparatus on the extended physical downlink control channel;
The mobile station apparatus, wherein the random access response is received from the base station apparatus through a physical downlink shared channel according to the second information. In a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus,
Receiving the first information instructing the start of a random access procedure in the primary cell from the base station apparatus on the physical downlink control channel;
A mobile station apparatus, wherein second information instructing the start of a random access procedure in a secondary cell is received from the base station apparatus on the extended physical downlink control channel. Simultaneously monitoring the physical downlink control channel and the extended physical downlink control channel;
The mobile station apparatus according to any one of claims 1 to 3, wherein the extended physical downlink control channel is arranged in a physical downlink shared channel region. In a base station device that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station device,
First information (in the description: the physical downlink control channel or the extended physical downlink control channel) is transmitted to the mobile station apparatus instructing the start of a random access procedure;
A random access preamble transmitted according to the first information by the mobile station apparatus is received from the mobile station apparatus by a physical random access channel;
Transmitting second information used for scheduling of a random access response to transmission of the random access preamble to the mobile station apparatus on the physical downlink control channel;
The base station apparatus, wherein the random access response is transmitted to the mobile station apparatus through a physical downlink shared channel. In a base station device that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station device,
Transmitting the first information instructing the start of a random access procedure to the mobile station apparatus using the physical downlink control channel or the extended physical downlink control channel;
A random access preamble transmitted according to the first information by the mobile station apparatus is received from the mobile station apparatus by a physical random access channel;
When the first information is transmitted on the physical downlink control channel, the mobile station apparatus transmits second information used for scheduling a random access response to the transmission of the random access preamble on the physical downlink control channel. To
When the first information is transmitted on the extended physical downlink control channel, the second information is transmitted to the mobile station apparatus on the extended physical downlink control channel,
The base station apparatus, wherein the random access response is transmitted to the mobile station apparatus through a physical downlink shared channel. In a base station device that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station device,
Transmitting the first information instructing the start of the random access procedure in the primary cell to the mobile station apparatus on the physical downlink control channel;
2. The base station apparatus, wherein second information for instructing start of a random access procedure in a secondary cell is transmitted to the mobile station apparatus using the extended physical downlink control channel. In a radio communication method used for a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus,
Receiving the first information instructing the start of a random access procedure from the base station apparatus on the extended physical downlink control channel;
According to the first information, a random access preamble is transmitted to the base station apparatus through a physical random access channel,
Receiving second information used for scheduling of random access response to transmission of the random access preamble from the base station apparatus on the physical downlink control channel;
According to the second information, the random access response is received from the base station apparatus through a physical downlink shared channel. In a radio communication method used for a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus,
Receiving from the base station apparatus first information instructing start of a random access procedure on the physical downlink control channel or the extended physical downlink control channel;
According to the first information, a random access preamble is transmitted to the base station apparatus through a physical random access channel,
When the first information is received on the physical downlink control channel, the base station apparatus transmits second information used for scheduling of a random access response to transmission of the random access preamble on the physical downlink control channel. Received from
When the first information is received on the extended physical downlink control channel, the second information is received from the base station apparatus on the extended physical downlink control channel;
According to the second information, the random access response is received from the base station apparatus through a physical downlink shared channel. In a radio communication method used for a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus,
Receiving the first information instructing the start of a random access procedure in the primary cell from the base station apparatus on the physical downlink control channel;
A wireless communication method, comprising: receiving, from the base station apparatus, second information instructing the start of a random access procedure in a secondary cell by using the extended physical downlink control channel. In a radio communication method used for a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station apparatus,
Transmitting the first information instructing the start of a random access procedure to the mobile station apparatus on the extended physical downlink control channel;
A random access preamble transmitted according to the first information by the mobile station apparatus is received from the mobile station apparatus by a physical random access channel;
Transmitting second information used for scheduling of a random access response to transmission of the random access preamble to the mobile station apparatus on the physical downlink control channel;
The wireless communication method, wherein the random access response is transmitted to the mobile station apparatus through a physical downlink shared channel. In a radio communication method used for a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station apparatus,
Transmitting the first information instructing the start of a random access procedure to the mobile station apparatus using the physical downlink control channel or the extended physical downlink control channel;
A random access preamble transmitted according to the first information by the mobile station apparatus is received from the mobile station apparatus by a physical random access channel;
When the first information is transmitted on the physical downlink control channel, the mobile station apparatus transmits second information used for scheduling a random access response to the transmission of the random access preamble on the physical downlink control channel. To
When the first information is transmitted on the extended physical downlink control channel, the second information is transmitted to the mobile station apparatus on the extended physical downlink control channel,
The wireless communication method, wherein the random access response is transmitted to the mobile station apparatus through a physical downlink shared channel. In a radio communication method used for a base station apparatus that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station apparatus,
Transmitting the first information instructing the start of the random access procedure in the primary cell to the mobile station apparatus on the physical downlink control channel;
A radio communication method, wherein second information for instructing start of a random access procedure in a secondary cell is transmitted to the mobile station apparatus using the extended physical downlink control channel. In an integrated circuit used in a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus,
Receiving the first information instructing the start of a random access procedure from the base station apparatus on the extended physical downlink control channel;
According to the first information, a random access preamble is transmitted to the base station apparatus through a physical random access channel,
Receiving second information used for scheduling of random access response to transmission of the random access preamble from the base station apparatus on the physical downlink control channel;
The integrated circuit, wherein the random access response is received from the base station apparatus through a physical downlink shared channel according to the second information. In an integrated circuit used in a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus,
Receiving from the base station apparatus first information instructing start of a random access procedure on the physical downlink control channel or the extended physical downlink control channel;
According to the first information, a random access preamble is transmitted to the base station apparatus through a physical random access channel,
When the first information is received on the physical downlink control channel, the base station apparatus transmits second information used for scheduling of a random access response to transmission of the random access preamble on the physical downlink control channel. Received from
When the first information is received on the extended physical downlink control channel, the second information is received from the base station apparatus on the extended physical downlink control channel;
The integrated circuit, wherein the random access response is received from the base station apparatus through a physical downlink shared channel according to the second information. In an integrated circuit used in a mobile station apparatus that receives a physical downlink control channel and an extended physical downlink control channel from a base station apparatus,
Receiving the first information instructing the start of a random access procedure in the primary cell from the base station apparatus on the physical downlink control channel;
An integrated circuit, wherein second information instructing start of a random access procedure in a secondary cell is received from the base station apparatus on the extended physical downlink control channel. In an integrated circuit used in a base station device that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station device,
Transmitting the first information instructing the start of a random access procedure to the mobile station apparatus on the extended physical downlink control channel;
A random access preamble transmitted according to the first information by the mobile station apparatus is received from the mobile station apparatus by a physical random access channel;
Transmitting second information used for scheduling of a random access response to transmission of the random access preamble to the mobile station apparatus on the physical downlink control channel;
An integrated circuit, wherein the random access response is transmitted to the mobile station apparatus through a physical downlink shared channel. In an integrated circuit used in a base station device that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station device,
Transmitting the first information instructing the start of a random access procedure to the mobile station apparatus using the physical downlink control channel or the extended physical downlink control channel;
A random access preamble transmitted according to the first information by the mobile station apparatus is received from the mobile station apparatus by a physical random access channel;
When the first information is transmitted on the physical downlink control channel, the mobile station apparatus transmits second information used for scheduling a random access response to the transmission of the random access preamble on the physical downlink control channel. To
When the first information is transmitted on the extended physical downlink control channel, the second information is transmitted to the mobile station apparatus on the extended physical downlink control channel,
An integrated circuit, wherein the random access response is transmitted to the mobile station apparatus through a physical downlink shared channel. In an integrated circuit used in a base station device that transmits a physical downlink control channel and an extended physical downlink control channel to a mobile station device,
Transmitting the first information instructing the start of the random access procedure in the primary cell to the mobile station apparatus on the physical downlink control channel;
An integrated circuit, wherein second information instructing the start of a random access procedure in a secondary cell is transmitted to the mobile station apparatus on the extended physical downlink control channel.