JP2013192039A - Mobile station device, base station apparatus, communication method, integrated circuit, and radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base station apparatus and a mobile station device capable of determining parameters related to signal scrambling, and performing efficient communication, and a communication method, an integrated circuit and a radio communication system.SOLUTION: When a physical downlink control channel is detected by a common search space, the mobile station device scrambles an uplink signal in a scrambling sequence generated by using a first parameter, and when the physical downlink control channel is detected by a user device specific search space, the mobile station device scrambles an uplink signal in a scrambling sequence generated by using a second parameter.

Description

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

  3GPP (Third Generation Partnership Project) in due LTE (Long Term Evolution), in the LTE-A (LTE-Advanced) and wireless communication systems, such as the IEEE WiMAX due to the (The Institute of Electrical and Electronics engineers) (Worldwide Interoperability for Microwave Access) is Each of the base station and the terminal is provided with one or a plurality of transmission / reception antennas, and high-speed data transmission can be realized by using, for example, a MIMO (Multiple Input Multiple Output) technique.

  Here, in a wireless communication system, it is considered that a plurality of terminals support MU-MIMO (Multiple User MIMO) that performs spatial multiplexing using the same frequency and time resources. In addition, it has been studied to support a CoMP (Cooperative Multipoint) transmission scheme in which a plurality of base stations cooperate with each other to perform interference coordination. For example, a wireless communication system in a heterogeneous network deployment (HetNet; Heterogeneous Network deployment) such as a macro base station with a wide coverage and an RRH (Remote Radio Head) with a narrower coverage than the macro base station is being studied.

  In such a wireless communication system, when uplink signals (uplink data) transmitted by each of a plurality of terminals have the same characteristics, interference occurs. In addition, when downlink signals (downlink data) transmitted by each of a plurality of base stations have the same characteristics, interference occurs. Hereinafter, the uplink signal and the downlink signal are also referred to as signals. Here, for example, a method for orthogonalizing a demodulation reference signal in order to reduce and suppress interference of a demodulation reference signal (DMRS; also referred to as a Demodulation Reference Signal) transmitted by each of a plurality of terminals Has been proposed (Non-Patent Document 1).

DMRS enhancements for UL CoMP; 3GPP TSG RAN WG1 meeting # 68 R1-120277, February 6th-10th, 2012.

  However, in the wireless communication system as described above, there has been no description regarding a specific procedure when the base station and the terminal determine parameters related to signal scrambling. That is, there is no description of how the base station and the terminal determine parameters related to signal scrambling and perform communication.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a base station apparatus and a mobile station apparatus in which a base station and a terminal can determine parameters related to signal scrambling and efficiently communicate with each other. A communication method and a communication system are provided.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, in the mobile station device that communicates with the base station device, when the physical downlink control channel is detected in the common search space, the physical downlink is generated by the scrambling sequence generated using the first parameter. When the uplink signal scheduled by the downlink control information transmitted on the control channel is scrambled and the physical downlink control channel is detected in the user equipment specific search space, it is generated using the second parameter. A scrambling sequence scrambles an uplink signal scheduled by downlink control information transmitted on the physical downlink control channel.

  (2) In addition, in the case of a base station device that communicates with a mobile station device and a physical downlink control channel is arranged in a common search space, the scrambling sequence generated using the first parameter When the downlink signal scheduled by the downlink control information transmitted on the physical downlink control channel is scrambled and the physical downlink control channel is arranged in the user equipment specific search space, the second parameter is used. The scrambling sequence generated in this way scrambles the downlink signal scheduled by the downlink control information transmitted on the physical downlink control channel.

  (3) In addition, in the communication method of the mobile station apparatus that communicates with the base station apparatus, when the physical downlink control channel is detected in the common search space, the scrambling sequence generated using the first parameter Then, when the uplink signal scheduled by the downlink control information transmitted on the physical downlink control channel is scrambled and the physical downlink control channel is detected in the user equipment specific search space, the second parameter The scrambled sequence generated using scrambles the uplink signal scheduled by the downlink control information transmitted on the physical downlink control channel.

  (4) Further, in the communication method of the base station apparatus that communicates with the mobile station apparatus, when the physical downlink control channel is arranged in the common search space, the scrambling sequence generated using the first parameter In the case where the downlink signal scheduled by the downlink control information transmitted by the physical downlink control channel is scrambled and the physical downlink control channel is arranged in the user equipment specific search space, the second parameter Scrambled downlink signals scheduled by downlink control information transmitted on the physical downlink control channel with a scrambling sequence generated using

  (5) In addition, when the physical downlink control channel is detected in the common search space in the integrated circuit mounted on the mobile station device communicating with the base station device, it is generated using the first parameter. In a scrambling sequence, a function of scrambling an uplink signal scheduled by downlink control information transmitted on the physical downlink control channel, and when detecting the physical downlink control channel in the user equipment specific search space The mobile station apparatus has a function of scrambling an uplink signal scheduled by downlink control information transmitted on the physical downlink control channel with a scrambling sequence generated using the second parameter. It is characterized by letting.

  (6) In addition, in an integrated circuit mounted on a base station device that communicates with a mobile station device, when the physical downlink control channel is arranged in a common search space, it is generated using the first parameter In a scrambling sequence, a function of scrambling a downlink signal scheduled by downlink control information transmitted on the physical downlink control channel, and a case where the physical downlink control channel is arranged in a user equipment specific search space The base station apparatus has a function of scrambling a downlink signal scheduled by downlink control information transmitted on the physical downlink control channel with a scrambling sequence generated using the second parameter. It is characterized by letting.

  (7) A radio communication system in which a base station apparatus and a mobile station apparatus communicate with each other, wherein the base station apparatus arranges a physical downlink control channel in a common search space or a user apparatus specific search space, and the mobile station When the apparatus detects the physical downlink control channel in a common search space, the apparatus uses a scrambling sequence generated by using the first parameter, based on downlink control information transmitted on the physical downlink control channel. When the scheduled uplink signal is scrambled and the physical downlink control channel is detected in the user equipment specific search space, the physical downlink control channel is generated by a scrambling sequence generated using the second parameter. Downlink control information transmitted by It is characterized by scrambling the uplink signal is scheduled by.

  Advantageous Effects of Invention According to the present invention, a base station and a terminal can determine parameters related to signals and can communicate efficiently.

It is a schematic block diagram which shows the structure of the base station which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the terminal which concerns on embodiment of this invention. It is the schematic which shows the example of the communication which concerns on embodiment of this invention. It is a figure which shows the example of a downlink signal. It is a figure explaining embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described. The wireless communication system in the embodiment of the present invention is a base station device (hereinafter also referred to as a base station, a transmission device, a cell, a serving cell, a transmission station, a transmission point, a transmission antenna group, a transmission antenna port group, and an eNodeB). Primary base station (also called macro base station, first base station, first communication device, serving base station, anchor base station, primary cell) and secondary base station (RRH, pico base station, femto base station, Home eNodeB, second base station apparatus, second communication apparatus, cooperative base station group, cooperative base station set, cooperative base station, and secondary cell). Also referred to as a mobile station apparatus (hereinafter referred to as a terminal, a terminal apparatus, a mobile terminal, a receiving apparatus, a receiving point, a receiving terminal, a third communication apparatus, a receiving antenna group, a receiving antenna port group, and a user apparatus (UE)) Provided).

  Here, the secondary base station may be indicated as a plurality of secondary base stations. For example, the primary base station and the secondary base station use a heterogeneous network arrangement, and part or all of the coverage of the secondary base station is included in the coverage of the primary base station, and communication is performed with the terminal.

  FIG. 1 is a schematic block diagram showing the configuration of a base station according to the embodiment of the present invention. Here, the base station shown in FIG. 1 includes a primary base station and a secondary base station. The base station includes a data control unit 101, a transmission data modulation unit 102, a radio unit 103, a scheduling unit 104, a channel estimation unit 105, a reception data demodulation unit 106, a data extraction unit 107, an upper layer 108, And the antenna 109. Radio section 103, scheduling section 104, channel estimation section 105, reception data demodulation section 106, data extraction section 107, upper layer 108 and antenna 109 constitute a reception section. Further, the data control unit 101, the transmission data modulation unit 102, the radio unit 103, the scheduling unit 104, the upper layer 108, and the antenna 109 constitute a transmission unit. Here, each part which comprises a base station is also called a unit.

  The data control unit 101 receives a transport channel from the scheduling unit 104. The data control unit 101 maps signals generated in the transport channel and the physical layer to the physical channel based on scheduling information input from the scheduling unit 104. Each mapped data is output to transmission data modulation section 102.

  The transmission data modulation unit 102 modulates / encodes transmission data. The transmission data modulation unit 102 modulates / encodes the data input from the data control unit 101 based on scheduling information from the scheduling unit 104, serial / parallel conversion of the input signal, IFFT (Inverse Fast Fourier Transform). Conversion: Performs signal processing such as inverse phase Fourier transform (CP) processing and CP (cyclic prefix) insertion, generates transmission data, and outputs the transmission data to the radio section 103.

  Radio section 103 up-converts the transmission data input from transmission data modulation section 102 to a radio frequency to generate a radio signal, and transmits the radio signal to a terminal via antenna 109. Radio section 103 receives a radio signal received from the terminal via antenna 109, down-converts it to a baseband signal, and outputs received data to channel estimation section 105 and received data demodulation section 106.

  The scheduling unit 104 performs mapping between logical channels and transport channels, downlink and uplink scheduling, and the like. Since the scheduling unit 104 controls the processing units of each physical layer in an integrated manner, the scheduling unit 104, the antenna 109, the radio unit 103, the channel estimation unit 105, the reception data demodulation unit 106, the data control unit 101, the transmission data modulation An interface between the unit 102 and the data extraction unit 107 exists.

  In downlink scheduling, the scheduling unit 104 generates transmission control and scheduling information in the transport channel and physical channel based on uplink control information received from the terminal, scheduling information input from the higher layer 108, and the like. To do. The scheduling information used for downlink scheduling is output to the data control unit 101.

  Further, in uplink scheduling, scheduling section 104 generates scheduling information based on the uplink channel state output from channel estimation section 105, scheduling information input from higher layer 108, and the like. Scheduling information used for uplink scheduling is output to the data control unit 101.

  In addition, the scheduling unit 104 maps the downlink logical channel input from the higher layer 108 to the transport channel, and outputs it to the data control unit 101. Also, the scheduling unit 104 processes the uplink transport channel and control data input from the data extraction unit 107 as necessary, maps them to the uplink logical channel, and outputs them to the upper layer 108.

  In addition, the scheduling unit 104 determines a parameter related to the downlink signal, and scrambles the downlink signal using the determined parameter.

  The channel estimation unit 105 estimates an uplink channel state from an uplink reference signal (for example, a demodulation reference signal) and outputs the uplink channel state to the reception data demodulation unit 106 in order to demodulate the uplink data. Further, in order to perform uplink scheduling, an uplink channel state is estimated from an uplink reference signal (for example, a sounding reference signal) and output to scheduling section 104.

  Received data demodulation section 106 demodulates received data. Based on the uplink channel state estimation result input from the channel estimation unit 105, the reception data demodulation unit 106 performs DFT conversion, subcarrier mapping, IFFT conversion, etc. on the modulation data input from the radio unit 103. Signal processing is performed, demodulation processing is performed, and the data is output to the data extraction unit 107.

  The data extraction unit 107 confirms whether the received data input from the received data demodulation unit 106 is correct and outputs a confirmation result (eg, ACK or NACK) to the scheduling unit 104. The data extraction unit 107 separates the data input from the reception data demodulation unit 106 into a transport channel and physical layer control data, and outputs the data to the scheduling unit 104.

  The upper layer 108 performs processing of a radio resource control (RRC) layer and processing of a MAC (Media Access Control) layer. The upper layer 108 integrates and controls the processing units of the lower layer, so the upper layer 108, the scheduling unit 104, the antenna 109, the radio unit 103, the channel estimation unit 105, the received data demodulation unit 106, the data control unit 101, There is an interface between the transmission data modulation unit 102 and the data extraction unit 107.

  FIG. 2 is a schematic block diagram showing the configuration of the terminal according to the embodiment of the present invention. The terminal includes a data control unit 201, a transmission data modulation unit 202, a radio unit 203, a scheduling unit 204, a channel estimation unit 205, a reception data demodulation unit 206, a data extraction unit 207, an upper layer 208, an antenna 209. The data control unit 201, transmission data modulation unit 202, radio unit 203, scheduling unit 204, upper layer 208, and antenna 209 constitute a transmission unit. The radio unit 203, scheduling unit 204, channel estimation unit 205, reception data demodulation unit 206, data extraction unit 207, higher layer 208, and antenna 209 constitute a reception unit. Here, each part which comprises a terminal is also called a unit.

  The data control unit 201 receives a transport channel from the scheduling unit 204. Further, the data control unit 201 maps signals generated in the transport channel and the physical layer to the physical channel based on the scheduling information input from the scheduling unit 204. Each mapped data is output to transmission data modulation section 202.

  The transmission data modulation unit 202 modulates / encodes transmission data. Transmission data modulation section 202 performs signal processing such as modulation / coding, input signal serial / parallel conversion, IFFT processing, CP insertion on the data input from data control section 201 to generate transmission data. To the wireless unit 203.

  Radio section 203 up-converts transmission data input from transmission data modulation section 202 to a radio frequency, generates a radio signal, and transmits the radio signal to a base station via antenna 209. Radio section 203 receives a radio signal received from the base station via antenna 209, down-converts it to a baseband signal, and outputs the received data to channel estimation section 205 and received data demodulation section 206. .

  The scheduling unit 104 performs mapping between logical channels and transport channels, downlink and uplink scheduling, and the like. Since the scheduling unit 204 controls the processing units of each physical layer in an integrated manner, the scheduling unit 204, the antenna 209, the data control unit 201, the transmission data modulation unit 202, the channel estimation unit 205, the reception data demodulation unit 206, the data There is an interface between the extraction unit 207 and the wireless unit 203.

  In the downlink scheduling, the scheduling unit 204 performs reception control and scheduling information on the transport channel and the physical channel based on downlink control information received from the base station, scheduling information input from the higher layer 208, and the like. Generate. The scheduling information used for downlink scheduling is output to the data control unit 201.

  In addition, in the uplink scheduling, the scheduling unit 204 determines the uplink logical channel input from the upper layer 208 based on the downlink control information received from the base station, the scheduling information input from the upper layer 208, and the like. Scheduling processing for mapping to the transport channel and generation of scheduling information used for uplink scheduling are performed. The scheduling information is output to the data control unit 201.

  Also, the scheduling unit 204 maps the uplink logical channel input from the higher layer 208 to the transport channel, and outputs it to the data control unit 201. The scheduling unit 204 also includes channel state information input from the channel estimation unit 205 and CRC (Cyclic Redundancy Check) parity bits (also simply referred to as CRC) input from the data extraction unit 207. The confirmation result is also output to the data control unit 201.

  In addition, the scheduling unit 204 determines parameters for the uplink signal, and scrambles the uplink signal using the determined parameter.

  The channel estimation unit 205 estimates a downlink channel state from a downlink reference signal (for example, a demodulation reference signal) for demodulation of downlink data, and outputs the channel state to the reception data demodulation unit 206. Received data demodulation section 206 demodulates the received data input from radio section 203 and outputs the demodulated data to data extraction section 207.

  The data extraction unit 207 confirms the correctness of the reception data input from the reception data demodulation unit 206 and outputs a confirmation result (for example, ACK or NACK) to the scheduling unit 204. Further, the data extraction unit 207 separates the reception data input from the reception data demodulation unit 206 into transport channel and physical layer control data, and outputs the data to the scheduling unit 204.

  The upper layer 208 performs processing of the radio resource control layer and processing of the MAC layer. The upper layer 208 integrates and controls the processing units of the lower layer, so that the upper layer 208, the scheduling unit 204, the antenna 209, the data control unit 201, the transmission data modulation unit 202, the channel estimation unit 205, the reception data demodulation unit 206, an interface between the data extraction unit 207 and the wireless unit 203 exists.

  FIG. 3 is a schematic diagram illustrating an example of communication according to the embodiment of the present invention. In FIG. 3, terminal 303 communicates with primary base station 301 and / or secondary base station 302. In addition, the terminal 304 communicates with the primary base station 301 and / or the secondary base station 302.

  In FIG. 3, when a terminal transmits an uplink signal to a base station, the terminal performs scrambling on the uplink signal and transmits it. Here, the uplink signal includes uplink data (uplink shared channel (UL-SCH; Uplink Shared Channel), uplink transport block). In addition, uplink control information (UCI) is included in the uplink signal. Here, UL-SCH is a transport channel.

  For example, uplink data is mapped to a physical uplink shared channel (PUSCH). That is, the uplink data is mapped to PUSCH resources (which may be physical resource blocks or resource elements). Moreover, uplink control information is mapped by PUSCH or a physical uplink control channel (PUCCH; Physical Uplink Control Channel). That is, the uplink control information is mapped to a PUSCH or PUCCH resource (which may be a physical resource block or a resource element).

  That is, the terminal 303 scrambles the uplink signal to be transmitted to the primary base station 301 and transmits it through the uplink 305. In addition, the terminal 303 scrambles the uplink signal to be transmitted to the secondary base station 302 and transmits it through the uplink 306. Also, the terminal 304 scrambles the uplink signal to be transmitted to the primary base station 301 and transmits it through the uplink 307. In addition, the terminal 304 scrambles the uplink signal to be transmitted to the secondary base station 302 and transmits it through the uplink 308.

  Here, when the uplink signal transmitted by the terminal 303 and the uplink signal transmitted by the terminal 304 have the same characteristics, interference occurs. Therefore, it is desirable to randomize the interference between the uplink signal transmitted by the terminal 303 and the uplink signal transmitted by the terminal 304.

  Also, in FIG. 3, when transmitting a downlink signal to the terminal, the base station performs scrambling on the downlink signal and transmits it. Here, the downlink signal includes downlink data (downlink shared channel (DL-SCH; Downlink Shared Channel), downlink transport block). Here, DL-SCH is a transport channel.

  For example, the downlink data is mapped to a physical downlink shared channel (PDSCH). That is, the downlink data is mapped to PDSCH resources (which may be physical resource blocks or resource elements).

  That is, the primary base station 301 scrambles the downlink signal to be transmitted to the terminal 303 and transmits it through the downlink 305. Also, the secondary base station 302 scrambles the downlink signal to be transmitted to the terminal 303 and transmits it through the downlink 306. In addition, the primary base station 301 scrambles the downlink signal to be transmitted to the terminal 304 and transmits it through the downlink 307. Also, the secondary base station 302 scrambles the downlink signal to be transmitted to the terminal 304 and transmits it through the downlink 308.

  Here, when the downlink signal transmitted by the primary base station 301 and the downlink signal transmitted by the secondary base station 302 have the same characteristics, interference occurs. For this reason, it is desirable to randomize interference between the downlink signal transmitted by the primary base station 301 and the downlink signal transmitted by the secondary base station 302.

  Here, in FIG. 3, different cell identities (also referred to as Cell IDs) can be set for the primary base station 301 and the secondary base station 302 (also referred to as Different cell IDs). In addition, the same cell cell identity can be set for all or part of the primary base station 301 and the secondary base station 302 (also referred to as Shared cell ID and Same cell ID). Here, the cell identity is also referred to as a physical layer cell identity (physical layer cell identity).

  In FIG. 3, aggregation of a plurality of serving cells (also simply referred to as cells) is supported in the downlink and uplink (referred to as carrier aggregation or cell aggregation). For example, in each serving cell, a transmission bandwidth of up to 110 resource blocks can be used. Here, in the carrier aggregation, one serving cell is defined as a primary cell (Pcell). In carrier aggregation, a serving cell other than the primary cell is defined as a secondary cell (Scell; Secondary Cell).

  In addition, a carrier corresponding to a serving cell in the downlink is defined as a downlink component carrier (DLCC). Also, a carrier corresponding to a primary cell in the downlink is defined as a downlink primary component carrier (DLPCC; Downlink Primary Component Carrier). A carrier corresponding to a secondary cell in the downlink is defined as a downlink secondary component carrier (DLSCC).

  Furthermore, a carrier corresponding to a serving cell in the uplink is defined as an uplink component carrier (ULCC). Further, a carrier corresponding to a primary cell in the uplink is defined as an uplink primary component carrier (ULPCC; Uplink Primary Component Carrier). Also, a carrier corresponding to a secondary cell in the uplink is defined as an uplink secondary component carrier (ULSCCC).

  That is, in carrier aggregation, a plurality of component carriers are aggregated to support a wide transmission bandwidth. Here, for example, the primary base station 301 can be regarded as a primary cell, and the secondary base station 302 can be regarded as a secondary cell (the base station sets the terminal) (also referred to as HetNet deployment with a carrier aggregation).

  FIG. 4 is a diagram illustrating an example of a downlink signal. FIG. 4 shows a resource area of a physical downlink shared channel (PDSCH; Physical Downlink Shared Channel) to which downlink data (downlink shared channel (DL-SCH; Downlink Shared Channel), downlink transport block) is mapped. It is shown. Here, DL-SCH is a transport channel.

  Moreover, the resource area | region of the physical downlink control channel (PDCCH; Physical Downlink Control PDCCH) where downlink control information (DCI; Downlink Control Information) is mapped is shown. Moreover, the resource area | region of E-PDCCH (Enhanced-PDCCH) to which downlink control information is mapped is shown.

  For example, the PDCCH is mapped to the first to third OFDM symbols in the downlink resource region. The E-PDCCH is mapped to the 4th to 12th OFDM symbols in the downlink resource region. Further, the E-PDCCH is mapped to the first slot and the second slot in one subframe. Further, PDSCH and E-PDCCH are subjected to FDM (Frequency Division Multiplexing). In the present embodiment, E-PDCCH is included in PDCCH.

  Here, the PDCCH is used to notify (designate) downlink control information to the terminal. A plurality of formats are defined for downlink control information transmitted on the PDCCH. Here, the format of the downlink control information is also referred to as a DCI format.

  For example, DCI format 1 and DCI format 1A used for scheduling one PDSCH (one PDSCH codeword, one downlink transport block transmission) in one cell are defined as DCI formats for the downlink. The Also, as a DCI format for the downlink, DCI format 2 used for scheduling of one PDSCH (up to two PDSCH codewords, transmission of up to two downlink transport blocks) in one cell is defined. The

  For example, the DCI format for the downlink includes downlink control information such as information on PDSCH resource allocation and information on MCS (Modulation and Coding scheme). Hereinafter, the DCI format used for PDSCH scheduling is also referred to as downlink assignment.

  Further, for example, as a DCI format for uplink, DCI format 0 used for scheduling of one PUSCH (one PUSCH codeword, one uplink transport block transmission) in one cell is defined. Also, as a DCI format for uplink, DCI format 4 used for scheduling of one PUSCH (up to two PUSCH codewords, transmission of up to two uplink transport blocks) in one cell is defined. The That is, DCI format 4 is used for scheduling transmission (transmission mode) on PUSCH using a plurality of antenna ports.

  For example, the DCI format for uplink includes downlink control information such as information on PUSCH resource allocation and information on MCS (Modulation and Coding scheme). The DCI format for the uplink may include information related to the scrambling sequence index. Hereinafter, the DCI format used for PUSCH scheduling is also referred to as an uplink grant.

  The PDSCH is used for downlink data transmission. Furthermore, the PDSCH is used to notify (designate) a random access response grant to the terminal. Here, the random access response grant is used for PUSCH scheduling. Here, the random access response grant is instructed to the physical layer by an upper layer (for example, the MAC layer).

  For example, the base station transmits a random access response including the random access response grant in the random access response transmitted as the message 2 in the random access procedure. Further, the base station transmits a random access response grant corresponding to the message 1 transmitted by the terminal in the random access procedure. In addition, the base station transmits a random access response grant for transmission of message 3 in the random access procedure. That is, the random access response grant can be used to schedule a PUSCH for transmission of message 3 in a random access procedure.

  In FIG. 4, the terminal monitors a set of PDCCH candidates (PDCCH candidates). Here, the PDCCH candidate indicates a candidate in which the PDCCH may be arranged and transmitted by the base station. Moreover, a PDCCH candidate is comprised from one or several control channel element (CCE; Control Channel Element). In addition, monitoring means that the terminal attempts to decode each PDCCH in the set of PDCCH candidates according to all the DCI formats to be monitored. Here, the set of PDCCH candidates monitored by the terminal is also called a search space. That is, a search space is a set of resources that may be used for PDCCH transmission by a base station.

  Further, a common search space (CSS; Common Search Space) and a user equipment specific search space (USS; UE-Specific Search Space, a terminal-specific (terminal-specific) search space) are configured in the PDCCH resource region. (Defined and set).

  That is, in FIG. 4, CSS and / or USS are configured in the PDCCH resource region. Also, CSS and / or USS are configured in the resource region of E-PDCCH. The terminal monitors the PDCCH in the CSS and / or USS of the PDCCH resource area, and detects the PDCCH addressed to itself. In addition, the terminal monitors the E-PDCCH in the CSS and / or USS of the E-PDCCH resource region, and detects the PDCCH addressed to itself.

  Here, CSS is used for transmission of downlink control information to a plurality of terminals. That is, CSS is defined by resources common to a plurality of terminals. For example, the CSS is composed of CCEs having a predetermined number between the base station and the terminal. For example, the CSS is composed of CCEs having indexes from 0 to 15. Here, CSS may be used for transmission of downlink control information to a specific terminal. That is, the base station transmits a DCI format intended for a plurality of terminals and / or a DCI format intended for a specific terminal in the CSS.

  The USS is used for transmission of downlink control information to a specific terminal. That is, USS is defined by resources dedicated to a certain terminal. That is, USS is defined independently for each terminal. For example, the USS includes a radio network temporary identifier (RNTI) assigned by a base station, a slot number in a radio frame, a number of CCEs determined based on an aggregation level, and the like. Here, the RNTI includes C-RNTI (Cell RNTI) and Temporary C-RNTI. That is, the base station transmits a DCI format intended for a specific terminal in the USS.

  Here, RNTI assigned to the terminal by the base station is used for transmission of downlink control information (transmission on PDCCH). Specifically, a CRC (Cyclic Redundancy Check) generated based on downlink control information (which may be in a DCI format) is added to the downlink control information, After being added, the CRC parity bits are scrambled with the RNTI.

  The terminal tries to decode the downlink control information with CRC parity bits scrambled by RNTI, and detects the PDCCH for which the CRC was successful as the PDCCH addressed to itself (also referred to as blind decoding). Here, RNTI includes C-RNTI and Temporary C-RNTI. That is, the terminal decodes the PDCCH with CRC scrambled by C-RNTI. In addition, the terminal decodes the PDCCH accompanied by the CRC scrambled by the Temporary C-RNTI.

  Here, C-RNTI is a unique (unique) identifier used for RRC (Radio Resource Control) connection and scheduling identification. For example, C-RNTI is utilized for dynamically scheduled unicast transmissions.

  Temporary C-RNTI is an identifier used for a random access procedure. Here, the base station transmits the Temporary C-RNTI included in the random access response. For example, Temporary C-RNTI is used in a random access procedure to identify a terminal performing a random access procedure. Temporary C-RNTI is used for retransmission of message 3 in the random access procedure. That is, the base station transmits the downlink control information on the PDCCH with the CRC scrambled by the Temporary C-RNTI in order for the terminal to retransmit the message 3. That is, the terminal changes the interpretation of the downlink control information based on which RNTI the CRC is scrambled with.

  Here, for example, the terminal executes a random access procedure in order to synchronize with the base station in the time domain. In addition, the terminal performs a random access procedure to establish an initial connection establishment (initial connection establishment). The terminal also executes a random access procedure for handover. In addition, the terminal performs a random access procedure for connection re-establishment. In addition, the terminal executes a random access procedure to request UL-SCH resources.

  When the PDSCH resource is scheduled by the downlink control information transmitted on the PDCCH, the terminal receives the downlink data on the scheduled PDSCH. Also, when the PUSCH resource is scheduled by the downlink control information transmitted on the PDCCH, the terminal transmits uplink data and / or uplink control information on the scheduled PUSCH.

  Here, for example, the uplink control information includes information indicating ACK / NACK for downlink data (also referred to as ACK / NACK in HARQ; Hybrid Automatic Repeat Request). Further, the uplink control information includes channel state information (CSI; Channel State Information). The channel state information includes rank indication (RI). Further, the channel state information includes a precoding matrix indicator (PMI; Precoding Matrix Indicator). In addition, the channel state information includes a channel quality indicator (CQI; Channel Quality Indicator).

  In addition, the base station and the terminal transmit and receive signals in an upper layer (Higher layer). For example, the base station and the terminal are also called a radio resource control signal (RRC signaling; Radio Resource Control signal, RRC message; Radio Resource Control message, RRC information; Radio Resource Control information) in the RRC layer (Layer 3). Send and receive. Here, in the RRC layer, a dedicated signal transmitted to a certain terminal by the base station is also referred to as a dedicated signal. That is, a setting (information) unique (specific) to a certain terminal is notified by a base station using a dedicated signal.

  Further, the base station and the terminal transmit and receive MAC control elements in a MAC (Media Access Control) layer (layer 2). Here, the RRC signaling and / or the MAC control element is also referred to as a higher layer signaling.

  An example of the scrambling process is described below. For example, when a signal is transmitted, it is associated with a codeword in the physical layer. Here, the signal includes an uplink signal. Further, the signal includes a downlink signal. For example, the base station can transmit up to two codewords (up to two downlink transport blocks) in one PDSCH in one subframe. Also, the terminal can transmit up to two codewords (up to two uplink transport blocks) on one PUSCH in one subframe.

That is, for example, in each codeword q, a bit sequence (which may be a block of bits) b ^(q) (0),..., B ^(q) (M _bit ^(q) −1) is scrambled. Also, for example, the bit sequence is scrambled before being modulated. Here, M _bit ^(q) −1 indicates the number of bits transmitted in codeword q in one subframe.

Here, for example, a scrambled bit sequence (may be a block of scrambled bits) b ′ ^(q) (0),..., B ′ ^(q) (M _bit ^(q) −1) is defined by Equation 1. (Produced)

Formula 1

Further, in Equation 1, the scrambling sequence c ^(q) (i) is given by Equation 2. For example, the scrambling sequence is defined by a gold sequence.

Formula 2

Here, for example, it is indicated by N _c = 1600. Also, the first m-sequence x ₁ is initialized by x ₁ (0) = 1, x ₁ (n) = 0, n = 1, 2,. The second m-sequence _{x 2} is initialized by Equation 3.

Formula 3

Here, c _init is defined by Equation 4. That is, the scrambling sequence is initialized by Equation 4. That is, the signal is scrambled with the scrambling sequence initialized by Equation 4.

Formula 4

Here, N _ID ^cell indicates a physical layer cell identity (also referred to as physical layer cell identity). That is, the N _ID ^cell indicates a cell (base station) specific (cell (base station) specific) identity. That is, the N _ID ^cell indicates the physical layer identity of the cell.

For example, the terminal can detect the N _ID ^cell using a synchronization signal (Synchronization signals). Also, the terminal can obtain the N _ID ^cell from information included in a higher layer signal (for example, a band over command) transmitted by the base station.

That is, N _ID ^cell is a parameter related to a scrambling sequence (generation of a scrambling sequence). That is, the N _ID ^cell is used for initializing the scrambling sequence. The terminal scrambles the uplink signal with the scrambling sequence generated using the N _ID ^cell .

Also, n _RNTI corresponds to RNTI related to PUSCH transmission (transmission on PUSCH). For example, it corresponds to RNTI related to PDCCH used for PUSCH schedule. That is, it corresponds to the RNTI scrambled to the CRC added to the downlink control information. For example, RNTI includes C-RNTI and Temporary C-RNTI. Here, for example, when Temporary C-RNTI is set by the upper layer, the RNTI related to transmission of PUSCH corresponding to the random access response grant is Temporary C-RNTI.

  The parameter “X” (the value of the parameter “X”) indicates a virtual cell identity (also referred to as a virtual cell identity). That is, the parameter “X” indicates a terminal-specific (user equipment specific; UE-specific) identity. That is, the parameter “X” indicates a parameter specific to the terminal.

  That is, the parameter “X” is a parameter related to the scrambling sequence (generation of the scrambling sequence). That is, the parameter “X” is used for initializing the scrambling sequence. The terminal scrambles the uplink signal with the scrambling sequence generated using the parameter “X”.

  Here, the base station can set the parameter “X” in the terminal using the higher layer signal. For example, the base station can set the parameter “X” using a dedicated signal. Further, the base station sets a plurality of parameters “X” using a dedicated signal, and downlink control information transmitted from the set plurality of parameters “X” by one PDCCH. (For example, information on scrambling sequence index) may be used to indicate. That is, downlink control information for indicating the parameter “X” is included in the uplink grant.

  Hereinafter, for ease of explanation, the downlink control information for indicating the parameter “X” is simply referred to as downlink control information for indicating the parameter.

  Here, the downlink control information for instructing the parameter may be included in the uplink grant only when it is set by the base station using an upper layer signal. For example, the base station can indicate whether or not downlink control information for indicating a parameter is included in the uplink grant using a dedicated signal.

  Further, for example, the base station sets the downlink transmission mode (for example, the transmission mode in PDSCH) and / or the uplink transmission mode (for example, the transmission mode in PUSCH) by using the dedicated signal. It is possible to instruct whether or not the downlink control information for instructing is included in the uplink grant.

  That is, the terminal identifies that downlink control information for indicating a parameter is included in the uplink grant only when a specific downlink transmission mode and / or uplink transmission mode is set. can do. Here, a specific downlink transmission mode and / or uplink transmission mode is defined in advance by specifications or the like, and can be known information between the base station and the terminal.

Here, a default value may be set for the parameter “X”. That is, the terminal uses the default value until it is set by the base station. Here, the default value is defined in advance by specifications or the like and can be known information between the base station and the terminal. For example, the default value of the parameter “X” may be N _ID ^cell .

Hereinafter, the physical layer cell identity N _ID ^cell is also referred to as a first parameter. The parameter “X” is also described as a second parameter.

  Here, as illustrated in FIG. 5, the terminal identifies a condition and switches a parameter for scrambling an uplink signal based on the condition. That is, the terminal switches parameters related to the scramble link sequence based on the condition. Here, when the condition is A, the terminal scrambles the uplink signal with the scrambling sequence generated using the first parameter. In addition, the terminal transmits the scrambled uplink signal by PUSCH.

  Further, the base station identifies the condition and switches a parameter related to the scrambling link sequence of the uplink signal based on the condition. Here, when the condition is A, the base station assumes that the uplink signal is scrambled with the scrambling sequence generated using the second parameter. In addition, the base station receives the scrambled uplink signal on the PUSCH.

  Also, when the condition is B, the terminal scrambles the uplink signal with the scrambling sequence generated using the second parameter. Further, when the condition is B, the base station assumes that the uplink signal is scrambled with the scrambling sequence generated using the second parameter.

Here, the condition A includes the detection (decoding) of the PDCCH in the CSS. That is, when the terminal detects PDCCH in CSS, the terminal scrambles the uplink signal with the scrambling sequence generated using the first parameter. That is, when the terminal detects the PDCCH in the CSS, the terminal scrambles the uplink signal with the scrambling sequence generated using the N _ID ^cell .

Further, when the PDCCH is arranged in the CSS, the base station assumes that the uplink signal is scrambled with the scrambling sequence generated using the first parameter. That is, when the PDCCH is arranged in the CSS, the base station receives an uplink signal with a scrambling sequence generated using the N _ID ^cell .

  Condition B includes detecting (decoding) the PDCCH in the USS. That is, when the terminal detects the PDCCH in the USS, the terminal scrambles the uplink signal with the scrambling sequence generated using the second parameter. That is, when the terminal detects the PDCCH in the USS, the terminal scrambles the uplink signal with the scrambling sequence generated using the parameter “X”.

  Further, when the PDCCH is arranged in the USS, the base station assumes that the uplink signal is scrambled with the scrambling sequence generated using the second parameter. That is, when the PDCCH is arranged in the USS, the base station receives an uplink signal with a scrambling sequence generated using the parameter “X”.

  Here, the downlink control information (for example, information on the scrambling sequence index) for indicating the parameter “X” is transmitted on the PDCCH in the USS.

  That is, the terminal scrambles the uplink signal with a scrambling sequence generated by a different method (using different parameters) based on the search space in which the PDCCH is detected. That is, the terminal scrambles the uplink signal with a scrambling sequence generated by a different method based on whether PDCCH is detected in CSS or USS.

Here, the condition A includes the detection (decoding) of the PDCCH with the CRC scrambled by the Temporary C-RNTI. That is, when the terminal detects a PDCCH with a CRC scrambled by Temporary C-RNTI, the terminal scrambles the uplink signal using a scrambling sequence generated using the first parameter. That is, when a terminal detects a PDCCH with a CRC scrambled by Temporary C-RNTI, the terminal scrambles an uplink signal using a scrambling sequence generated using the N _ID ^cell .

In addition, when the PDCCH with CRC scrambled by Temporary C-RNTI is arranged, the base station assumes that the uplink signal is scrambled by the scrambling sequence generated using the first parameter. . That is, when the PDCCH with CRC scrambled by Temporary C-RNTI is arranged, the base station receives an uplink signal using a scrambling sequence generated using the N _ID ^cell .

  Further, the condition B includes detecting (decoding) a PDCCH accompanied by a CRC scrambled by C-RNTI. That is, when a terminal detects a PDCCH with a CRC scrambled by C-RNTI, the terminal scrambles an uplink signal with a scrambling sequence generated using the second parameter. That is, when a terminal detects a PDCCH with a CRC scrambled by C-RNTI, the terminal scrambles an uplink signal with a scrambling sequence generated using parameter “X”.

  Further, when the PDCCH with CRC scrambled by the C-RNTI is arranged, the base station assumes that the uplink signal is scrambled with a scrambling sequence generated using the second parameter. That is, when a PDCCH with a CRC scrambled by C-RNTI is arranged, the base station receives an uplink signal with a scrambling sequence generated using parameter “X”.

  Here, the downlink control information (for example, information on the scrambling sequence index) for indicating the parameter “X” is transmitted on the PDCCH with the CRC scrambled by the C-RNTI.

  That is, the terminal scrambles the uplink signal with a scrambling sequence generated by a different method (using different parameters) based on the RNTI in which the CRC is scrambled. That is, the terminal scrambles the uplink signal with a scrambling sequence generated by a different method based on whether the CRC is scrambled by Temporary C-RNTI or scrambled by C-RNTI.

Here, the condition A includes the detection (decoding) of the PDCCH with CRC scrambled by C-RNTI or Temporary C-RNTI in CSS. That is, when a terminal detects a PDCCH with a CRC scrambled by C-RNTI or Temporary C-RNTI in CSS, the terminal transmits an uplink signal using a scrambling sequence generated using the first parameter. Scramble. That is, when a terminal detects a PDCCH with a CRC scrambled by C-RNTI or Temporary C-RNTI in CSS, the terminal scrambles an uplink signal with a scrambling sequence generated using an N _ID ^cell. To do.

Also, when the PDCCH with CRC scrambled by C-RNTI or Temporary C-RNTI is arranged in the CSS, the base station uses the scrambling sequence generated using the first parameter, and the uplink Assume that the signal is scrambled. That is, in the case where the PDCCH with CRC scrambled by C-RNTI or Temporary C-RNTI is arranged in CSS, the base station uses the scrambling sequence generated using the N _ID ^cell , and the uplink signal Receive.

  The condition B includes detecting (decoding) a PDCCH accompanied by a CRC scrambled by C-RNTI in USS. That is, when a terminal detects a PDCCH with a CRC scrambled by C-RNTI in USS, the terminal scrambles an uplink signal with a scrambling sequence generated using the second parameter. That is, when a terminal detects a PDCCH with CRC scrambled by C-RNTI in the USS, the terminal scrambles the uplink signal with a scrambling sequence generated using parameter “X”.

  In addition, when the PDCCH with CRC scrambled by C-RNTI is arranged in the USS, the base station scrambles the uplink signal with the scrambling sequence generated using the second parameter. Suppose. That is, when a PDCCH with a CRC scrambled by C-RNTI is arranged in the USS, the base station receives an uplink signal with a scrambling sequence generated using the parameter “X”.

  Here, the downlink control information (for example, information on the scrambling sequence index) for instructing the parameter “X” is transmitted on the PDCCH with the CRC scrambled by the C-RNTI in the USS.

  That is, the terminal scrambles the uplink signal with a scrambling sequence generated by a different method (using different parameters) based on the search space where the PDCCH is detected and the RNTI scrambled to the CRC.

  The condition A includes receiving (detecting and decoding) a predetermined DCI format (hereinafter referred to as a first DCI format). Here, the first DCI format is defined in advance by specifications or the like and can be known information between the base station and the terminal. For example, the first DCI format includes DCI format 0. Here, DCI format 0 is transmitted by PDCCH in CSS and / or USS.

That is, when the terminal receives the first DCI format, the terminal scrambles the uplink signal with the scrambling sequence generated using the first parameter. That is, when the terminal receives the first DCI format, the terminal scrambles the uplink signal with the scrambling sequence generated using the N _ID ^cell .

Further, when the base station transmits the first DCI format, it is assumed that the uplink signal is scrambled with the scrambling sequence generated using the first parameter. That is, when the first DCI format is transmitted, the base station receives the uplink signal with a scrambling sequence generated using the N _ID ^cell .

  The condition B includes reception (detection) of a DCI format other than the predetermined DCI format (hereinafter referred to as a second DCI format). For example, the DCI format 4 is included in the second DCI format. Here, the DCI format 4 is transmitted only by PDCCH in USS.

  That is, when the terminal receives the second DCI format, the terminal scrambles the uplink signal with the scrambling sequence generated using the second parameter. That is, when the terminal receives the second DCI format, the terminal scrambles the uplink signal with the scrambling sequence generated using the parameter “X”.

  Further, when the base station transmits the second DCI format, it is assumed that the uplink signal is scrambled with the scrambling sequence generated using the second parameter. That is, when the second DCI format is transmitted, the base station receives the uplink signal with the scrambling sequence generated using the parameter “X”.

  Here, downlink control information (for example, information on the scrambling sequence index) for indicating the parameter “X” is included in the second DCI format and transmitted.

  That is, the terminal scrambles the uplink signal with a scrambling sequence generated by a different method (using different parameters) based on the received DCI format. That is, the terminal scrambles the uplink signal with a scrambling sequence generated by a different method based on whether the PDCCH has received the first DCI format or the second DCI format.

  In addition, the condition A includes initial transmission of a transport block (UL-SCH, uplink transport block) on the PUSCH scheduled by the random access response grant.

That is, the terminal scrambles the uplink signal with the scrambling sequence generated using the first parameter when the transport block is initially transmitted on the PUSCH scheduled by the random access response grant. That is, the terminal scrambles the uplink signal with the scrambling sequence generated using the N _ID ^cell when the transport block is initially transmitted using the PUSCH scheduled by the random access response grant.

In addition, when the base station schedules PUSCH for initial transmission of the transport block by the random access response grant, the uplink signal is scrambled by the scrambling sequence generated using the first parameter. Assuming that That is, when scheduling a PUSCH for initial transmission of a transport block, the base station receives an uplink signal with a scrambling sequence generated using the N _ID ^cell .

  The above-described embodiments can also be applied to downlink signals. That is, in FIG. 5, the base station identifies a condition and switches a parameter for scrambling a downlink signal based on the condition. That is, the base station switches parameters related to the scramble link sequence based on the condition. Here, when the condition is A, the base station scrambles the downlink signal with the scrambling sequence generated using the first parameter. Further, the base station transmits the scrambled downlink signal by PDSCH.

  Further, the terminal identifies a condition and switches a parameter related to the scramble link sequence based on the condition. Here, when the condition is A, the terminal assumes that the downlink signal is scrambled with the scrambling sequence generated using the second parameter. In addition, the terminal receives the scrambled downlink signal on the PDSCH.

  Further, when the condition is B, the base station scrambles the downlink signal with a scrambling sequence generated using the second parameter. Further, when the condition is B, the terminal assumes that the downlink signal is scrambled with the scrambling sequence generated using the second parameter.

  Here, the conditions A and B are as described above.

  That is, when the PDCCH is arranged in the CSS, the base station scrambles the downlink signal with the scrambling sequence generated using the first parameter. Further, when the PDCCH is arranged in the USS, the base station scrambles the downlink signal with the scrambling sequence generated using the second parameter.

  Further, when the terminal detects PDCCH in CSS, the terminal receives a downlink signal with a scrambling sequence generated using the first parameter. Further, when the terminal detects PDCCH in USS, the terminal receives a downlink signal with a scrambling sequence generated using the second parameter.

  In addition, when the PDCCH with CRC scrambled by Temporary C-RNTI is arranged, the base station scrambles the downlink signal with the scrambling sequence generated using the first parameter. In addition, when the PDCCH with CRC scrambled by C-RNTI is arranged, the base station scrambles the downlink signal with the scrambling sequence generated using the second parameter.

  Also, when the terminal detects a PDCCH with CRC scrambled by Temporary C-RNTI, the terminal receives a downlink signal with a scrambling sequence generated using the first parameter. Also, when the terminal detects a PDCCH with a CRC scrambled by C-RNTI, the terminal receives a downlink signal with a scrambling sequence generated using the second parameter.

  Also, when the PDCCH with CRC scrambled by C-RNTI or Temporary C-RNTI is arranged in the CSS, the base station uses the scrambling sequence generated using the first parameter to generate the downlink signal. Scramble. In addition, when a PDCCH with a CRC scrambled by C-RNTI is arranged in the USS, the base station scrambles the downlink signal with a scrambling sequence generated using the second parameter.

  In addition, when the terminal detects a PDCCH with a CRC scrambled by C-RNTI or Temporary C-RNTI in the CSS, the terminal uses a scrambling sequence generated using the first parameter to generate a downlink signal. Receive. Also, when the terminal detects a PDCCH with CRC scrambled by C-RNTI in the USS, the terminal receives a downlink signal with a scrambling sequence generated using the second parameter.

  Further, when the base station transmits the first DCI format, the base station scrambles the downlink signal with the scrambling sequence generated using the first parameter. Further, when the base station transmits the second DCI format, the base station scrambles the downlink signal with the scrambling sequence generated using the second parameter.

  Further, when the terminal receives the first DCI format, the terminal receives the downlink signal with the scrambling sequence generated using the first parameter. Further, when the terminal transmits the second DCI format, the terminal receives the downlink signal with the scrambling sequence generated using the second parameter.

  By the method as described above, for example, the base station and the terminal can transmit and receive signals by switching the scrambling sequence more flexibly. Also, the signal can be transmitted and received by switching the scrambling sequence more dynamically by the method as described above.

  For example, the signal can be transmitted and received using the condition A during the period when the base station and the terminal are performing settings in the RRC layer. That is, signals are transmitted and received using Condition A during a period when settings are ambiguous (unclear) that occur when settings are made in the RRC layer (a period in which settings do not match between the base station and the terminal). can do.

Here, as described above, in the case of condition A, the base station and the terminal transmit and receive signals using a scrambling sequence generated using the N _ID ^cell . That is, it is possible to continue communication even during a period in which the base station and the terminal are performing settings in the RRC layer, and communication using radio resources efficiently can be performed.

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

  In the case of distribution in the market, the program can be stored and distributed in a portable recording medium, or transferred to a server computer connected via a network such as the Internet. In this case, the storage device of the server computer is also included in the present invention. Moreover, you may implement | achieve part or all of the primary base station in the embodiment as mentioned above, the secondary base station, and the terminal as LSI which is typically an integrated circuit. Here, each functional block of the primary base station, the secondary base station, and the terminal 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's, and implementation using dedicated circuitry or general purpose processors is also possible. 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.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention. The present invention can be modified in various ways within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention. It is. Moreover, it is the element described in each said embodiment, and the structure which substituted the element which has the same effect is also contained.

  The present invention is suitable for mobile station apparatuses, base station apparatuses, communication methods, wireless communication systems, and integrated circuits.

DESCRIPTION OF SYMBOLS 100 Base station 101 Data control part 102 Transmission data modulation part 103 Radio part 104 Scheduling part 105 Channel estimation part 106 Reception data demodulation part 107 Data extraction part 108 Upper layer 109 Antenna 200 Terminal 201 Data control part 202 Transmission data modulation part 203 Radio part 204 Scheduling unit 205 Channel estimation unit 206 Received data demodulation unit 207 Data extraction unit 208 Upper layer 209 Antenna 301 Primary base station 302 Secondary base station 303, 304 Terminals 305, 306, 307, 308 Uplink, downlink

Claims (7)

A mobile station device that communicates with a base station device,
When a physical downlink control channel is detected in the common search space, an uplink scheduled by downlink control information transmitted on the physical downlink control channel with a scrambling sequence generated using the first parameter. Scramble the link signal,
When the physical downlink control channel is detected in the user equipment specific search space, the scrambling sequence generated using the second parameter is scheduled according to the downlink control information transmitted on the physical downlink control channel. A mobile station apparatus characterized by scrambling an uplink signal to be transmitted. A base station device that communicates with a mobile station device,
When the physical downlink control channel is arranged in the common search space, the scrambling sequence generated using the first parameter is the downlink scheduled by the downlink control information transmitted on the physical downlink control channel. Scramble the link signal,
When the physical downlink control channel is arranged in the user equipment specific search space, the scrambling sequence generated using the second parameter is scheduled according to the downlink control information transmitted on the physical downlink control channel. A base station apparatus that scrambles a downlink signal to be transmitted. A communication method of a mobile station apparatus that communicates with a base station apparatus,
When a physical downlink control channel is detected in the common search space, an uplink scheduled by downlink control information transmitted on the physical downlink control channel with a scrambling sequence generated using the first parameter. Scramble the link signal,
When the physical downlink control channel is detected in the user equipment specific search space, the scrambling sequence generated using the second parameter is scheduled according to the downlink control information transmitted on the physical downlink control channel. A communication method characterized by scrambling an uplink signal to be transmitted. A communication method of a base station device that communicates with a mobile station device,
When the physical downlink control channel is arranged in the common search space, the scrambling sequence generated using the first parameter is the downlink scheduled by the downlink control information transmitted on the physical downlink control channel. Scramble the link signal,
When the physical downlink control channel is arranged in the user equipment specific search space, the scrambling sequence generated using the second parameter is scheduled according to the downlink control information transmitted on the physical downlink control channel. A communication method characterized by scrambling a received downlink signal. An integrated circuit mounted on a mobile station device that communicates with a base station device,
When a physical downlink control channel is detected in the common search space, an uplink scheduled by downlink control information transmitted on the physical downlink control channel with a scrambling sequence generated using the first parameter. A function to scramble the link signal;
When the physical downlink control channel is detected in the user equipment specific search space, the scrambling sequence generated using the second parameter is scheduled according to the downlink control information transmitted on the physical downlink control channel. An integrated circuit characterized by causing the mobile station device to exert a function of scrambling an uplink signal to be transmitted. An integrated circuit mounted on a base station device that communicates with a mobile station device,
When the physical downlink control channel is arranged in the common search space, the scrambling sequence generated using the first parameter is the downlink scheduled by the downlink control information transmitted on the physical downlink control channel. A function to scramble the link signal;
When the physical downlink control channel is arranged in the user equipment specific search space, the scrambling sequence generated using the second parameter is scheduled according to the downlink control information transmitted on the physical downlink control channel. An integrated circuit characterized by causing the base station device to exhibit a function of scrambling a downlink signal to be transmitted. A wireless communication system in which a base station device and a mobile station device communicate with each other,
The base station device
Place physical downlink control channel in common search space or user equipment specific search space,
The mobile station device
When the physical downlink control channel is detected in the common search space, the scrambling sequence generated using the first parameter is scheduled by the downlink control information transmitted on the physical downlink control channel. Scramble the uplink signal,
When the physical downlink control channel is detected in the user equipment specific search space, the scrambling sequence generated using the second parameter is scheduled according to the downlink control information transmitted on the physical downlink control channel. A radio communication system characterized by scrambling an uplink signal to be transmitted.