JP2013042260A - Mobile station device, base station device, communication system, communication method, and integrated circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to adequately set pieces of independent transmission timing to frequency bands of a plurality of up-links in a communication system comprising a plurality of mobile station devices and a base station device.SOLUTION: A mobile station device measures reception quality of a downlink of a non-connection cell which is a cell not used for transmission and reception of a data channel, measures the difference of reception timing between a reception signal of the non-connection cell the reception quality of which has been measured and a reception signal of a connection cell which is a cell used for transmission and reception of the data channel, determines whether or not the difference of reception timing is equal to or more than a prescribed time, and transmits either of information indicating that the difference of reception timing is equal to or more than the described time or information indicating the connection cell about which the difference of reception timing is within the prescribed time based on the determination, and information indicating the reception quality.

Description

  The present invention relates to a mobile station apparatus, a base station apparatus, a communication system, to which independent transmission timing is applied to a plurality of uplink frequency bands in a communication system including a plurality of mobile station apparatuses and a base station apparatus. The present invention relates to a communication method 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 communication system (downlink; referred to as DL) from a base station apparatus to a mobile station apparatus. . In LTE, a single-carrier transmission SC-FDMA (Single-Carrier Frequency Division Multiple Access) system is used as a communication system (uplink; referred to as UL) from a mobile station apparatus to a base station apparatus. Used. In LTE, a DFT-Spread OFDM (Discrete Fourier Transform-Spread OFDM) system is used as an SC-FDMA system.

  In 3GPP, a radio access method and a radio network (hereinafter referred to as “Long Term Evolution-Advanced (LTE-A)” or “Advanced Evolved”) that realizes higher-speed data communication using a frequency band wider than LTE. Universal Terrestrial Radio Access (A-EUTRA) ") is under study. In LTE-A, it is required to realize backward compatibility with LTE. A base station apparatus compatible with LTE-A communicates simultaneously with both mobile station apparatuses compatible with LTE-A and mobile station apparatuses compatible with LTE, and mobile stations compatible with LTE-A It is required for LTE-A to realize that the apparatus communicates with a base station apparatus compatible with LTE-A and a base station apparatus compatible with LTE.

  In order to realize this requirement, LTE-A has been studied to support at least the same channel structure as LTE. A channel means a medium used for signal transmission. A channel used in the physical layer is called a physical channel, and a channel used in the media access (Media Access Control: MAC) layer is called a logical channel. Physical channel types include physical downlink shared channel (PDSCH) used for transmission / reception of downlink data and control information, and physical downlink control channel (Physical) used for transmission / reception of downlink control information. Downlink Control CHannel (PDCCH), Physical Uplink Shared Channel (PUSCH) used for transmission / reception of uplink data and control information, Physical Uplink Control Channel (Physical Uplink Control CHannel for transmission / reception of control information) : PUCCH), synchronization channel used for downlink synchronization establishment (Synchronization CHannel: SCH), physical random access channel (Physical Random Access CHannel: PRACH) used for establishment of uplink synchronization, downlink system Physical broadcast channel (Physica used for information transmission) l Broadcast CHannel (PBCH). A mobile station apparatus or a base station apparatus arranges and transmits a signal generated from control information, data, and the like on each physical channel. Data transmitted on the physical downlink shared channel or the physical uplink shared channel is referred to as a transport block.

  In LTE-A, a plurality of frequency bands having the same channel structure as LTE (hereinafter referred to as “component carrier (CC)”. Also referred to as element frequency bands) are used to provide one frequency band (broadband). (Frequency band aggregation; Spectrum aggregation; Carrier aggregation; also called CA: Carrier aggregation, Frequency aggregation, etc.) are being studied. Specifically, in communication using carrier aggregation, a downlink physical channel is transmitted and received for each downlink component carrier (hereinafter, referred to as DL component carrier; DL CC), and an uplink component carrier is transmitted. The uplink physical channel is transmitted and received every time (hereinafter referred to as uplink component carrier; UL CC). That is, carrier aggregation is a technique in which a base station apparatus and a mobile station apparatus simultaneously transmit and receive signals on a plurality of physical channels using a plurality of CCs in the uplink and the downlink.

  In LTE-A, a mode in which a base station apparatus communicates using an arbitrary frequency band is referred to as a “cell”. Carrier aggregation is communication by a plurality of cells using a plurality of frequency bands, and is also referred to as cell aggregation. In cell aggregation, a plurality of cells are defined as two different types of cells, one cell is defined as a primary cell (PCell: Primary Cell), and the other cells are defined as secondary cells (SCell: Secondary Cell). The base station apparatus independently sets the PCell and SCell for each mobile station apparatus using cell aggregation. The PCell is always composed of a set (combination) of one DL CC and one UL CC. The SCell is composed of at least one DL CC and may or may not be configured with a UL CC. The CC used in the PCell is referred to as a primary component carrier (PCC: Primary CC). The CC used in the SCell is referred to as a secondary component carrier (SCC: Secondary CC). In PCell and SCell, data communication using PDSCH and PUSCH is performed in common, but other various processes are performed differently. Briefly, a plurality of processes are performed only by the PCell and not performed by the SCell. For example, in PCell, acquisition of system information in the downlink, determination of radio link failure (RLF: Radio Link Failure), etc. are performed, and random access procedures for initial connection and scheduling requests using PRACH in the uplink are performed. Execution, transmission / reception of uplink control information using PUCCH, and the like are performed. Basically, all the processes performed in LTE that does not use cell aggregation are performed in PCell, and a plurality of processes other than data communication are not performed in SCell.

  In LTE-A, it is considered to use repeaters for some cells in a plurality of cells. In addition, it is considered to use different repeaters in different cells among a plurality of cells. In this case, the propagation environment differs between cells, and the arrival timing of the signal transmitted from the mobile station device at the base station device differs between cells. For this reason, in order to maintain the uplink synchronization of each cell between a base station apparatus and a mobile station apparatus, it is necessary to apply an independent transmission timing to UL CCs of a plurality of cells. For example, the base station device causes the mobile station device to independently transmit a signal for measuring uplink synchronization loss in several cells. For example, the base station apparatus acquires information on the difference in downlink reception timing between cells from the mobile station apparatus, and executes a procedure of applying different transmission timings when necessary (Non-Patent Document 1).

  It has been studied to execute a random access procedure using PRACH as a signal for measuring uplink synchronization loss (Non-Patent Document 2). The base station apparatus instructs the mobile station apparatus to execute a random access procedure for a cell that is considered to need to measure uplink synchronization loss. A base station apparatus transmits the information which shows the preamble (RACH preamble) series transmitted by PRACH to a mobile station apparatus using PDCCH. The mobile station apparatus transmits the preamble sequence indicated by the information included in the received PDCCH to the base station apparatus using the PRACH in the cell UL CC. Note that the RACH preamble that is explicitly assigned by the base station apparatus is referred to as a dedicated preamble. In addition, an instruction by PDCCH including information indicating a preamble sequence is referred to as a PDCCH order. The base station apparatus that has detected the Dedicated preamble transmits information (TA command) indicating an uplink transmission timing adjustment value (TA: Timing Advance, Timing Adjustment, and Timing Alignment) to the mobile station apparatus. A mobile station apparatus receives the information which shows the adjustment value of the transmission timing of an uplink with DL CC of the cell which transmitted Dedicated preamble. The mobile station apparatus adjusts the uplink transmission timing of the cell based on the received information indicating the adjustment value of the uplink transmission timing.

  Further, the mobile station apparatus detects a difference in downlink reception timing between cells, applies the detected reception timing difference to the difference in uplink transmission timing, and performs the uplink access without executing the random access procedure. A method for adjusting the transmission timing is also being studied. For example, in this case, the base station apparatus instructs the mobile station apparatus to finely adjust the transmission timing based on a sounding reference signal (SRS) transmitted from the mobile station apparatus.

  If repeaters are not used for some cells and signals of multiple cells are transmitted / received by the same base station apparatus, the procedure for detecting appropriate transmission timing is performed only by the PCell, and is used for the PCell. The adjusted value of the uplink transmission timing is also used for the SCell. For example, the random access procedure for measuring uplink synchronization loss is performed only by the PCell. When repeaters are used for some cells in a plurality of cells, the mobile station apparatus performs a procedure for detecting a transmission timing different from the PCell for the SCell independently of the procedure for the PCell. For example, the random access procedure for measuring the uplink synchronization shift for the SCell is performed independently of the procedure for the PCell. For example, the transmission timing reflecting the difference in the reception timing between the downlink signal of the PCell and the downlink signal of the SCell in the uplink transmission timing of the PCell set by the random access procedure or the like is the transmission timing of the SCell. Is set.

  The downlink control information transmitted and received on the PDCCH includes control information related to the allocation of PDSCH resources. In LTE-A, a technique (referred to as cross carrier scheduling) in which a PDCCH and a PDSCH including control information related to resource allocation in the PDCCH are arranged in different DL CCs is being studied. The DL CC in which the PDSCH is arranged is referred to as a physical downlink shared channel component carrier (PDSCH CC). The DL CC in which the PDCCH is arranged is referred to as a physical downlink control channel component carrier (PDCCH CC). In addition, when there is a possibility that PDSCH is arranged in all DL CCs used in carrier aggregation, all DL CCs are PDSCH CCs.

  The base station apparatus determines, for each mobile station apparatus, which DL CC to use as the PDCCH CC among the plurality of DL CCs used for carrier aggregation. Next, the base station apparatus determines for each mobile station apparatus which PDSCH CC is associated with each PDCCH CC. Here, the association between the PDCCH CC and the PDSCH CC means that a PDCCH including control information related to allocation of PDSCH resources arranged in the PDSCH CC is arranged in the PDCCH CC associated with the PDSCH CC. To do. A base station apparatus notifies the information which shows DL CC matched as PDCCH CC with respect to each PDSCH CC to a mobile station apparatus. Based on the information notified from the base station apparatus, the mobile station apparatus recognizes a DL CC in which a PDCCH including control information related to PDSCH resource allocation of each PDSCH CC may be arranged.

  In addition, the same DL CC may be sufficient as PDSCH CC and PDCCH CC matched with the PDSCH CC. In this case, information indicating the DL CC associated as the PDCCH CC may not be explicitly notified to the mobile station apparatus. A plurality of PDSCH CCs may be associated with one PDCCH CC. In other words, multiple PDSCH CCs may be associated with the same PDCCH CC.

3GPP TSG RAN2 # 74, Barcelona, Spain, 9-13, May, 2011, R2-113285 “Discussion on TA group management”

3GPP TSG RAN2 # 74, Barcelona, Spain, 9-13, May, 2011, R2-113284 “RACH issues for supporting multiple TAs”

  For example, when there is no restriction on the frequency band in which the repeater is used, the base station apparatus cannot grasp in advance whether the mobile station apparatus is close to the base station apparatus or the repeater in a cell of a certain frequency band. In another expression, when there is no restriction on the frequency band in which the repeater is used, the base station apparatus determines whether the mobile station apparatus is receiving a signal from the base station apparatus in a cell of a certain frequency band, or the signal from the repeater. It is impossible to know in advance whether or not it is received. Therefore, the base station apparatus cannot recognize in advance whether or not it is necessary to execute a procedure for applying transmission timings different from those of other cells in a cell in which the mobile station apparatus can connect to the repeater.

  For example, the base station apparatus cannot recognize in advance whether or not the mobile station apparatus needs to execute a random access procedure in a cell that can be connected to the repeater. That is, there is a problem in that a random access procedure is executed in a cell that does not require a random access procedure, and a delay occurs before the data communication is started. For example, the base station apparatus recognizes in advance whether it is necessary to adjust transmission timing (fine adjustment, readjustment) independently of other cells for a cell that the mobile station apparatus can connect to a repeater. I can't. In other words, performing a procedure for adjusting the transmission timing in a cell that does not need to adjust the transmission timing independently means that the uplink resource used for detecting the value of the transmission timing adjustment or the transmission There has been a problem in that downlink resources used for transmitting information indicating timing adjustment values are wasted and the efficiency of the communication system resources is reduced.

  The present invention has been made in view of the above points, and an object of the present invention is to provide independent transmission timing for a plurality of uplink frequency bands in a communication system including a plurality of mobile station apparatuses and a base station apparatus. The present invention relates to a mobile station apparatus, a base station apparatus, a communication system, a communication method, and an integrated circuit that can be appropriately set.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, in the mobile station apparatus of the present invention, the cell includes a connected cell used for data channel transmission / reception or a non-connected cell not used for data channel transmission / reception, and uses the connection cell having a plurality of different frequencies. Mobile station apparatus that communicates with the base station apparatus, measuring the downlink reception quality of the non-connected cell, the received signal of the non-connected cell that has measured the reception quality, and the received signal of the connected cell Information indicating that the difference in reception timing is greater than or equal to a predetermined time based on the determination, and determining whether or not the difference in reception timing is greater than or equal to a predetermined time, Or, any one of the information indicating the connected cell whose difference in reception timing is within a predetermined time and the information indicating the reception quality are transmitted to the base station apparatus, That.

  (2) In addition, when the mobile station apparatus of the present invention determines that there are a plurality of the connected cells in which the difference in the reception timing is within a predetermined time, information indicating the connected cell in which the difference in the reception timing is the smallest It is characterized by transmitting.

  (3) In the mobile station apparatus of the present invention, the information indicating the connected cell in which the difference in reception timing is within a predetermined time includes transmission timing to which the connected cell in which the difference in reception timing is within a predetermined time. It is the information which shows the group of.

  (4) Moreover, in the mobile station apparatus of the present invention, the connection cell includes a first type cell or a second type cell, and the mobile station apparatus of the present invention includes the first type cell. If it is determined that the difference in reception timing is within a predetermined time, only information indicating the reception quality is transmitted, and the difference in reception timing is greater than or equal to a predetermined time for the first type cell. Yes, when it is determined that the reception timing difference is within a predetermined time with respect to the second type cell, information indicating the second type cell with the reception timing difference within a predetermined time; , And information indicating the reception quality are transmitted.

  (5) Further, in the mobile station apparatus of the present invention, the connected cell used for measurement of the difference in reception timing is a cell used as a reference for uplink transmission timing.

  (6) Further, in the base station apparatus of the present invention, the cell includes a connection cell used for transmission / reception of a data channel or a non-connection cell not used for transmission / reception of a data channel, and the connection having a plurality of different frequencies A base station apparatus that communicates with a mobile station apparatus using a cell, information indicating downlink reception quality of the non-connected cell, a received signal of the non-connected cell in which the reception quality is measured, and the connection From the mobile station apparatus, information indicating that the difference in reception timing with the received signal of the cell is greater than or equal to a predetermined time, or timing related information configured by information indicating the connected cell within a predetermined time. When receiving and configuring the unconnected cell as the connected cell, a transmission timing group is set based on the timing related information.

  (7) Further, the communication system of the present invention includes a plurality of mobile station apparatuses and a base station apparatus that communicates with the plurality of mobile station apparatuses, and the cell is a connected cell used for data channel transmission / reception, or A communication system comprising non-connected cells that are not used for transmission / reception of data channels, wherein the base station apparatus and the mobile station apparatus communicate with each other using the connected cells having different frequencies, wherein the mobile station apparatus Measuring the reception quality of the downlink of the non-connected cell, measuring the reception timing difference between the reception signal of the non-connection cell that has measured the reception quality and the reception signal of the connection cell, It is determined whether or not the difference is greater than or equal to a predetermined time, and based on the determination, information indicating that the difference in reception timing is greater than or equal to a predetermined time, or the reception timing Either of the information indicating the connected cell whose difference is within a predetermined time and the information indicating the reception quality are transmitted to the base station device, and the base station device determines the downlink reception quality of the non-connected cell. Information indicating that a difference in reception timing between the received signal of the non-connected cell and the received signal of the connected cell whose reception quality is measured is equal to or greater than a predetermined time, or the connection that is within a predetermined time When the mobile station apparatus receives timing related information configured by any of information indicating cells and configures the unconnected cell as the connected cell, a transmission timing group is set based on the timing related information. It is characterized by performing.

  (8) Further, in the communication method of the present invention, the cell is a connected cell used for data channel transmission / reception or a non-connected cell not used for data channel transmission / reception, and the connection cell has a plurality of different frequencies. A communication method used in a mobile station apparatus that communicates with a base station apparatus using a step of measuring downlink reception quality of the non-connected cell, and reception of the non-connected cell in which the reception quality is measured A step of measuring a reception timing difference between a signal and a reception signal of the connected cell, a step of determining whether the difference of the reception timing is a predetermined time or more, and the reception timing based on the determination Information indicating that the difference between the reception timings is equal to or greater than a predetermined time, or information indicating the connected cell whose difference in reception timing is within a predetermined time, and the reception Characterized in that it comprises a step of transmitting the information indicating the quality to the base station apparatus, at least.

  (9) Further, the integrated circuit of the present invention is an integrated circuit that allows the mobile station apparatus to perform a plurality of functions by being mounted on the mobile station apparatus, and the cell is used for transmitting and receiving data channels. A function comprising a connected cell or a non-connected cell that is not used for transmission / reception of a data channel, and a function of communicating with a base station apparatus using the connected cell having a plurality of different frequencies, and downlink reception quality of the non-connected cell A function for measuring the reception timing difference between the reception signal of the non-connected cell for which the reception quality is measured and the reception signal of the connection cell, and the difference in the reception timing is equal to or greater than a predetermined time. Information indicating that the difference in reception timing is equal to or greater than a predetermined time based on the determination, or the difference in reception timing is within a predetermined time based on the determination That with any of the information indicating the connected cell, a function of transmitting the information indicating the reception quality to the base station apparatus, a series of functions including, characterized in that to exhibit to the mobile station apparatus.

  The present specification discloses the present invention in terms of improvement of a communication system, a base station apparatus, a mobile station apparatus, a communication method, and an integrated circuit when the mobile station apparatus and the base station apparatus are connected using a plurality of frequency bands. However, the communication method to which the present invention is applicable is not limited to a communication method that is upward compatible with LTE, such as LTE or LTE-A. For example, the present invention can be applied to UMTS (Universal Mobile Telecommunications System).

  According to the present invention, independent transmission timings can be appropriately set for a plurality of uplink frequency bands.

It is a schematic block diagram which shows the structure of the base station apparatus 3 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the transmission process part 107 of the base station apparatus 3 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the reception process part 101 of the base station apparatus 3 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the mobile station apparatus 5 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the reception process part 401 of the mobile station apparatus 5 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the transmission process part 407 of the mobile station apparatus 5 which concerns on embodiment of this invention. It is a flowchart which shows an example of the process which produces | generates the information regarding the difference of the reception timing of the connection cell and non-connection cell of the measurement report production | generation part 4051 of the mobile station apparatus 5 which concerns on embodiment of this invention. It is a figure which shows the structural example of the connection cell which concerns on embodiment of this invention. It is a figure explaining the outline about the whole picture of the communications system concerning the embodiment of the present invention. It is a figure which shows the example in which the base station apparatus 3 and the mobile station apparatus 5 communicate via the repeater 4 in the communication system 1 which concerns on embodiment of this invention. It is a figure which shows schematic structure of the time frame of the downlink from the base station apparatus 3 which concerns on embodiment of this invention to the mobile station apparatus 5. FIG. It is a figure which shows schematic structure of the time frame of the uplink from the mobile station apparatus 5 which concerns on embodiment of this invention to the base station apparatus 3. FIG. It is a figure which shows an example of the structure of the cell aggregation comprised by the mobile station apparatus 5 which concerns on embodiment of this invention.

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

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, an overview of the communication system according to the present embodiment will be described with reference to FIGS. Next, the configuration of the communication system according to the present embodiment will be described with reference to FIGS. Next, operation processing of the communication system according to the present embodiment will be described with reference to FIGS.

<Overview of communication system>
FIG. 9 is a diagram illustrating an outline of the overall image of the communication system according to the embodiment of the present invention. The communication system 1 shown in this figure includes a base station apparatus (eNodeB, NodeB, BS: Base Station, AP: also referred to as an access point) 3, a plurality of repeaters 4A, 4B, 4C, and a plurality of mobile stations. Station devices (UE: User Equipment, MS: Mobile Station, MT: Mobile Terminal, terminal, terminal device, also referred to as mobile terminal) 5A, 5B, 5C communicate with each other. Note that the communication system according to the embodiment of the present invention may include other network entities. The base station device 3 can move the mobile station devices 5A, 5B, and 5C through the repeaters 4A, 4B, and 4C or without the repeaters 4A, 4B, and 4C depending on the positions of the mobile station devices 5A, 5B, and 5C. And wireless communication. Further, in this figure, the downlink (also referred to as DL: Downlink) which is a communication direction from the base station apparatus 3 to the mobile station apparatuses 5A, 5B, and 5C is a downlink pilot channel (downlink reference signal), physical It shows that it comprises a downlink control channel (also referred to as PDCCH: Physical Downlink Control CHannel) and a physical downlink shared channel (also referred to as PDSCH: Physical Downlink Shared CHannel). In addition, when the repeaters 4A, 4B, and 4C are used, the communication directions from the repeaters 4A, 4B, and 4C to the mobile station apparatuses 5A, 5B, and 5C are also downlinks.

  In this figure, the uplink (also referred to as UL: Uplink), which is the communication direction from the mobile station devices 5A, 5B, 5C to the base station device 3, is also referred to as a physical uplink shared channel (PUSCH: PhysicalUplink Shared CHannel). ), An uplink pilot channel (uplink reference signal; UL RS, SRS, DM RS), and a physical uplink control channel (also referred to as PUCCH: Physical Uplink Control CHannel) . When the repeaters 4A, 4B, and 4C are used, the communication directions from the mobile station devices 5A, 5B, and 5C to the repeaters 4A, 4B, and 4C are also uplinks.

  A channel means a medium used for signal transmission. A channel used in the physical layer is called a physical channel, and a channel used in the medium access control (MAC) layer is called a logical channel. The PDSCH is a physical channel used for transmission / reception of downlink data and control information. The PDCCH is a physical channel used for transmission / reception of downlink control information. PUSCH is a physical channel used for transmission / reception of uplink data and control information. The PUCCH is a physical channel used for transmission / reception of uplink control information (uplink control information: UCI). As the type of UCI, whether to request an acknowledgment (ACK / NACK) indicating an acknowledgment (Acknowledgement: ACK) or a negative acknowledgment (NACK) for PDSCH downlink data, and resource allocation A scheduling request (SR) or the like indicating that is used. Other physical channel types include synchronization channels (Synchronization CHannel: SCH) used to establish downlink synchronization and physical random access channels (Physical) used to establish uplink synchronization. Random Access CHannel (PRACH), a physical broadcast channel (PBCH) used for transmission of downlink system information, and the like are used. The PDSCH is also used for transmission of downlink system information.

  The mobile station devices 5A, 5B, 5C, or the base station device 3 arranges and transmits signals generated from control information, data, etc. in each physical channel. Data transmitted on the PDSCH or PUSCH is referred to as a transport block. Moreover, the area which the base station apparatus 3 has jurisdiction over is called a cell. It should be noted that the meaning (definition) of a “cell” that is an area managed by the base station apparatus 3 is different from a “cell” configured by cell aggregation described later. Note that even if the base station apparatus 3 and the mobile station apparatuses 5A, 5B, and 5C communicate with each other through the repeaters 4A, 4B, and 4C, the mobile station apparatuses 5A, 5B, and 5C have the repeaters 4A, 4B, Processing is not performed in consideration of the existence of 4C, and communication is performed by regarding the repeaters 4A, 4B, and 4C as the base station apparatus 3. Hereinafter, in the present embodiment, the mobile station devices 5A, 5B, and 5C are referred to as the mobile station device 5, and the repeaters 4A, 4B, and 4C are included in the base station device 3 for explanation.

  Further, in the embodiment of the present invention, the communication system 1 in which a repeatability (Frequency selectivity repeater) is used will be described. The present invention can also be applied to a communication system in which the The RRH is managed by the base station apparatus 3 and transmission / reception is controlled. A base station apparatus with a wide coverage is generally called a macro base station apparatus. A base station apparatus with a narrow coverage is generally called a pico base station apparatus or a femto base station apparatus. In general, RRH is considered to be used in an area where coverage is narrower than that of a macro base station apparatus, and is considered to be used as a role such as a pico base station apparatus or a femto base station apparatus. The present invention can be applied to a communication system configured by a macro base station apparatus and an RRH, and the coverage supported by the macro base station apparatus includes a part or all of the coverage supported by the RRH. Such a communication system deployment is referred to as a heterogeneous network deployment. For example, in FIG. 9, the communication system is such that the base station device 3 corresponds to a macro base station device and the repeater 4 corresponds to RRH. There is a propagation environment between a cell in which signal transmission / reception is directly performed between the mobile station apparatus 5 and the base station apparatus 3 and a cell in which signal transmission / reception is performed between the mobile station apparatus 5 and the base station apparatus 3 via the RRH. Unlike the case of the repeater, the arrival timing (reception timing) of the signal transmitted from the mobile station device 5 at the base station device 3 and RRH is different. That is, the arrival timing on the receiving side differs between cells.

<Carrier aggregation / Cell aggregation>
In the communication system according to the embodiment of the present invention, communication is performed using a plurality of frequency bands having a predetermined frequency bandwidth (frequency band aggregation; spectrum aggregation; carrier aggregation; carrier aggregation; also called CA, frequency aggregation, etc.) .) Here, one frequency band is called a component carrier (Component Carrier: CC). Specifically, in communication using carrier aggregation, a downlink physical channel is transmitted and received for each downlink CC (downlink component carrier; referred to as DL CC), and an uplink CC (uplink component) is transmitted. Carrier; referred to as UL CC.) An uplink physical channel is transmitted and received every time. That is, in the communication system according to the embodiment of the present invention using carrier aggregation, in the uplink and the downlink, the base station device 3 and the plurality of mobile station devices 5 transmit signals on a plurality of physical channels using a plurality of CCs. Send and receive at the same time.

  For example, carrier aggregation is realized by aggregating a plurality of CCs in different frequency bands (frequency bands). Note that the CCs to be aggregated may be continuous in the frequency domain, or may be discontinuous between all or some CCs. For example, when a usable frequency band is an 800 MHz band, a 2.4 GHz band, and a 3.4 GHz band, a certain CC is configured with an 800 MHz band, another CC is configured with a 2 GHz band, and another CC is configured with a 3.4 GHz band. Also good. For example, carrier aggregation is realized by aggregating a plurality of CCs in the same frequency band (frequency band). For example, all CCs configured for carrier aggregation may be configured in the 2.4 GHz band.

  Moreover, the frequency bandwidth of each CC comprised by carrier aggregation may be the same, and may differ between all or some CC. The base station device 3 configures (assigns) the CC to the mobile station device 5 on the basis of various factors such as the amount of data buffer remaining, the reception quality of the mobile station device 5, the load in the management area, and the QoS. You can increase or decrease the number. Note that the number of UL CCs that the base station device 3 assigns (sets, adds, configures) to the mobile station device 5 is the same as or less than the number of DL CCs that the base station device 3 assigns to the mobile station device 5. It is desirable.

  The base station device 3 communicates with the mobile station device 5 using one arbitrary frequency band in one cell. Carrier aggregation is communication by a plurality of cells using a plurality of frequency bands, and is also referred to as cell aggregation. In cell aggregation, one cell is defined as a primary cell (PCell: Primary Cell), and the remaining cells are defined as secondary cells (SCell: Secondary Cell). The setting of PCell and SCell is performed independently for each mobile station apparatus 5. The PCell is always composed of a set of one DL CC and one UL CC. SCell is comprised from at least 1 DL CC, UL CC may be comprised and does not need to be comprised. For the sake of simplification of description, in the present embodiment, description is mainly made assuming that one SCell is composed of one DL CC and one UL CC set. The CC used in the PCell is referred to as a primary component carrier (PCC: Primary CC). The CC used in the SCell is referred to as a secondary component carrier (SCC: Secondary CC).

  In PCell and SCell, data communication using PDSCH and PUSCH is performed in common, but other various processes are performed differently. Briefly, a plurality of processes are performed only by the PCell and not performed by the SCell. For example, in PCell, acquisition of system information in the downlink, determination of radio link failure (RLF: Radio Link Failure), etc. are performed, and for initial connection and scheduling request (resource allocation request) using PRACH in the uplink. The random access procedure is executed, and UCI transmission / reception using PUCCH is performed. In the PCell and at least some SCells (for example, SCells connected via repeaters or RRHs), a random access procedure for measuring uplink synchronization loss can be performed. The mobile station device 5 detects a difference in downlink reception timing between the PCell and the SCell or a difference in downlink reception timing between the SCell and the SCell, and transmits the SCell based on the detected difference in reception timing. When adjusting the timing, the random access procedure may not be executed in the SCell. For example, the mobile station apparatus 5 applies the difference in downlink reception timing between cells as it is to the difference in uplink transmission timing between cells. For example, the difference in reception timing is detected (calculated) from a shift in downlink radio frame timing, a shift in downlink subframe timing, a shift in SCH timing, and the like.

  For example, when communication is performed using cell aggregation, the mobile station device 5A shown in FIG. 9 directly transmits and receives signals to and from the base station device 3 in a certain cell, and the base station device via a repeater 4A in a certain cell. 3 to send and receive signals. For example, in the mobile station device 5A, a cell in which signals are directly transmitted / received to / from the base station device 3 is set to PCell, and a cell in which signals are transmitted / received to / from the base station device 3 via the repeater 4A is set to SCell. Is done. In this case, two independent transmission timings are set. For example, in the mobile station device 5A, a cell that directly transmits and receives signals to and from the base station device 3 is set to PCell, and a cell that transmits and receives signals to and from the base station device 3 through the repeater 4A is 1 cell of SCell. A cell that transmits and receives signals to and from the base station device 3 through the repeater 4B is set as one of the SCells. In this case, three independent transmission timings are set. For example, in the mobile station device 5A, a cell in which signals are directly transmitted / received to / from the base station device 3 is set to one of PCell and SCell, and signals are transmitted / received to / from the base station device 3 via the repeater 4A. A cell is set to one of the SCells. In this case, two independent transmission timings are set. Here, a group composed of a plurality of cells to which the same transmission timing is applied is referred to as a transmission timing group (TA group). A common TA command (details will be described later) is applied in units of TA groups. In addition, a timer (TA timer) that measures the effectiveness of the TA command in units of TA group may be set and managed. One TA group may be composed of only one cell. For example, in the mobile station device 5A, a cell that directly transmits and receives signals to and from the base station device 3 is set to PCell, and a cell that transmits and receives signals to and from the base station device 3 through the repeater 4A is SCell 2. Set to one. In this case, two independent transmission timings are set. In this case, two different TA groups are set (configured and applied).

  FIG. 10 is a diagram illustrating an example in which the base station device 3 and the mobile station device 5 communicate via the repeater 4 (repeater 4-1 and repeater 4-2) in the communication system 1 according to the embodiment of the present invention. This figure shows a case where cell aggregation is performed using three cells (cell 1, cell 2, and cell 3). The mobile station device 5 communicates with the base station device 3 via the repeater 4-1 in the cell 1, directly communicates with the base station device 3 without going through the repeater in the cell 2, and repeater 4-2 in the cell 3 To communicate with the base station apparatus 3 via In this case, the arrival timing of the downlink signal of each cell is basically different in the mobile station apparatus 5. In this case, when the mobile station apparatus 5 sets the uplink transmission timing of each cell to the same timing, basically the arrival timing of the uplink signal at the base station apparatus 3, the repeater 4-1, and the repeater 4-2. Is different. The mobile station apparatus 5 sets the uplink transmission timing for each cell so that the uplink signal has an appropriate arrival timing for each cell of the base station apparatus 3, the repeater 4-1, and the repeater 4-2. Make adjustments and send the signal.

<Configuration of downlink time frame>
FIG. 11 is a diagram showing a schematic configuration of a downlink time frame from the base station apparatus 3 to the mobile station apparatus 5 according to the embodiment of the present invention. Note that the downlink time frame from the repeater 4 to the mobile station apparatus 5 and the downlink time frame from the base station apparatus 3 to the repeater 4 are basically the same as those in FIG. In this figure, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The downlink time frame is a unit for resource allocation and the like, and is a resource block (RB) (physical resource block; also referred to as a PRB: Physical Resource Block) composed of a frequency band and a time slot having a predetermined downlink width. .)) (Physical resource block pair; referred to as PRB pair). One downlink PRB pair (referred to as downlink physical resource block pair; DL PRB pair) is referred to as two consecutive PRBs (downlink physical resource block; DL PRB in the downlink time domain). ).

  Also, in this figure, one DL PRB is composed of 12 subcarriers (referred to as downlink subcarriers) in the downlink frequency domain, and 7 OFDM (orthogonal frequency division multiplexing) in the time domain. ; Orthogonal Frequency Division Multiplexing) symbols. A downlink system band (referred to as a downlink system band) is a downlink communication band of the base station apparatus 3. The downlink system bandwidth (referred to as downlink system bandwidth) is composed of a plurality of downlink CC bandwidths (referred to as downlink component carrier bandwidths). In the communication system 1, a downlink CC (downlink component carrier; referred to as DL CC) is a predetermined frequency bandwidth, and the downlink component carrier bandwidth is a DL CC frequency bandwidth. . For example, the downlink system band having a frequency bandwidth of 40 MHz is composed of two DL CCs having a frequency bandwidth of 20 MHz.

  In the DL CC, a plurality of DL PRBs are arranged according to the downlink component carrier bandwidth. For example, a DL CC with a frequency bandwidth of 20 MHz is composed of 110 DL PRBs. Further, for example, the downlink component carrier bandwidth is a frequency bandwidth that can be used for communication by the mobile station device 5 corresponding to LTE, and the downlink system bandwidth is determined by the mobile station device 5 corresponding to LTE-A. It is a frequency bandwidth that can be used for communication. The mobile station apparatus 5 compatible with LTE can communicate with only one cell at a time, and the mobile station apparatus 5 compatible with LTE-A can communicate with a plurality of cells simultaneously. The downlink component carrier bandwidth is a downlink frequency bandwidth of one cell, and the downlink system bandwidth is a collection of downlink frequency bandwidths of a plurality of cells.

  In the time domain shown in this figure, a slot composed of seven OFDM symbols (referred to as a downlink slot) and a subframe composed of two downlink slots (referred to as a downlink subframe). There is.) A unit composed of one downlink subcarrier and one OFDM symbol is called a resource element (RE) (downlink resource element). In each downlink subframe, at least a PDSCH used for transmitting information data (also referred to as a transport block) and a PDCCH used for transmitting control information are arranged. In this figure, the PDCCH is composed of the first to third OFDM symbols in the downlink subframe, and the PDSCH is composed of the fourth to fourteenth OFDM symbols in the downlink subframe. Note that the number of OFDM symbols constituting the PDCCH and the number of OFDM symbols constituting the PDSCH may be changed for each downlink subframe.

  Although not shown in this figure, a downlink pilot channel used for transmission of a downlink reference signal (RS) (referred to as a downlink reference signal, also referred to as a Cell specific RS or DL RS) is provided. Distributed to a plurality of downlink resource elements. Here, the downlink reference signal is a signal known in the communication system 1 that is used for estimating propagation path fluctuations of the PDSCH and PDCCH signals. Note that the number of downlink resource elements constituting the downlink reference signal depends on the number of transmission antennas used for communication to the mobile station apparatus 5 in the base station apparatus 3.

  One PDSCH is composed of one or more DL PRBs in the same DL CC, and one PDCCH is composed of a plurality of downlink resource elements in the same DL CC. A plurality of PDSCHs and a plurality of PDCCHs are arranged in the downlink system band. The base station apparatus 3 has one PDCCH and one PDCCH including control information related to allocation of PDSCH resources in the same DL CC in the same downlink subframe for one mobile station apparatus 5 corresponding to LTE. A PDSCH can be arranged, and a plurality of PDCCHs and a plurality of PDSCHs including control information related to PDSCH resource allocation are arranged in the same downlink subframe for one mobile station apparatus 5 corresponding to LTE-A. be able to. Note that the base station apparatus 3 includes control information related to allocation of resources of a plurality of PDSCHs in the same DL CC in the same downlink subframe with respect to one mobile station apparatus 5 corresponding to LTE-A. A plurality of PDCCHs can be arranged, but a plurality of PDSCHs cannot be arranged in the same DL CC, and each PDSCH can be arranged in a different DL CC.

  PDCCH is information indicating allocation of DL PRB to PDSCH, information indicating allocation of UL PRB to PUSCH, mobile station apparatus identifier (mobile station identifier) (referred to as RNTI: Radio Network Temporary Identifier), modulation scheme, and encoding. A signal generated from control information such as a rate, a retransmission parameter, multi-antenna related information, a transmission power control command (TPC command), and information indicating a PUCCH resource is arranged. Control information included in the PDCCH is referred to as downlink control information (DCI). DCI including information indicating DL PRB allocation to PDSCH is referred to as downlink assignment (also referred to as DL assignment: Downlink assignment), and DCI including information indicating UL PRB allocation to PUSCH is uplink. This is called a link grant (UL grant). The downlink assignment is used as information on a PDCCH order (explained later) when some resource allocation information fields indicate specific values. Specifically, the downlink assignment used as information on the PDCCH order includes at least information indicating a preamble sequence of the dedicated preamble and information indicating an uplink subframe of the PRACH that can transmit the dedicated preamble. Note that the downlink assignment includes a transmission power control command for PUCCH. The uplink assignment includes a transmission power control command for PUSCH. One PDCCH includes only information indicating the allocation of one PDSCH resource in one DL CC, or information indicating the allocation of one PUSCH resource in one UL CC. It does not include information indicating allocation of a plurality of PDSCH resources or information indicating allocation of a plurality of PUSCH resources.

  Further, as information transmitted on the PDCCH, there is a cyclic redundancy check CRC (Cyclic Redundancy Check) code. The relationship between DCI, RNTI, and CRC transmitted on the PDCCH will be described in detail. A CRC code is generated from DCI using a predetermined generator polynomial. The generated CRC code is subjected to exclusive OR (also referred to as scrambling) processing using RNTI. A signal obtained by modulating a bit indicating DCI and a bit generated by performing exclusive OR processing on the CRC code using RNTI (referred to as CRC masked by UE ID) is actually transmitted on PDCCH. Is done.

<Configuration of uplink time frame>
FIG. 12 is a diagram showing a schematic configuration of an uplink time frame from the mobile station apparatus 5 to the base station apparatus 3 according to the embodiment of the present invention. The uplink time frame from the mobile station apparatus 5 to the repeater 4 and the uplink time frame from the repeater 4 to the base station apparatus 3 are basically the same as in FIG. In this figure, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The uplink time frame is a unit for resource allocation or the like, and is a PRB pair (uplink physical resource block pair; referred to as UL PRB pair) composed of a frequency band and a time band having a predetermined width in the uplink. Consists of One UL PRB pair is composed of two uplink PRBs (uplink physical resource block; referred to as UL PRB) that are continuous in the uplink time domain.

  Also, in this figure, one UL PRB is composed of 12 subcarriers (referred to as uplink subcarriers) in the uplink frequency domain, and 7 SC-FDMA (Single- Carrier Frequency Division Multiple Access) symbol. An uplink system band (referred to as an uplink system band) is an uplink communication band of the base station apparatus 3. The uplink system bandwidth (referred to as uplink system bandwidth) is composed of a plurality of uplink CC frequency bandwidths (referred to as uplink component carrier bandwidths). In the communication system 1, an uplink CC (uplink component carrier; referred to as UL CC) is a predetermined frequency bandwidth, and the uplink component carrier bandwidth is a UL CC frequency bandwidth. . For example, an uplink system band having a frequency bandwidth of 40 MHz (referred to as an uplink system band) is composed of two UL CCs having a frequency bandwidth of 20 MHz.

  In the UL CC, a plurality of UL PRBs are arranged according to the uplink component carrier bandwidth. For example, a UL CC with a frequency bandwidth of 20 MHz is composed of 110 UL PRBs. Also, for example, the uplink component carrier bandwidth is a frequency bandwidth that can be used for communication by the mobile station device 5 that supports LTE, and the uplink system bandwidth is the mobile station device 5 that supports LTE-A. It is a frequency bandwidth that can be used for communication. The mobile station apparatus 5 compatible with LTE can communicate with only one cell at a time, and the mobile station apparatus 5 compatible with LTE-A can communicate with a plurality of cells simultaneously. The uplink component carrier bandwidth is the uplink frequency bandwidth of one cell, and the uplink system bandwidth is the sum of the uplink frequency bandwidths of a plurality of cells.

  In the time domain shown in this figure, a slot composed of seven SC-FDMA symbols (referred to as an uplink slot) and a subframe composed of two uplink slots (uplink subframe). Called). A unit composed of one uplink subcarrier and one SC-FDMA symbol is referred to as a resource element (referred to as an uplink resource element).

  Each uplink subframe includes at least PUSCH used for transmission of information data, PUCCH used for transmission of uplink control information (UCI), and demodulation of PUSCH and PUCCH (estimation of propagation path fluctuation). Uplink pilot channels are arranged. Also, a PRACH used for uplink synchronization establishment is arranged in any uplink subframe. Also, in any uplink subframe, an uplink pilot channel used for measurement of channel quality, synchronization loss, and the like is arranged. The PUCCH is a UCI (ACK / NACK) indicating an acknowledgment (ACK: Acknowledgement) or a negative acknowledgment (NACK: Negative Acknowledgement) for data received using the PDSCH, and whether or not to request allocation of uplink resources. It is used to transmit at least UCI (SR: Scheduling Request) and UCI (CQI: Channel Quality Indicator) indicating downlink reception quality (also referred to as channel quality).

  One PUSCH is composed of one or more UL PRBs in the same UL CC, and one PUCCH is symmetrical in the frequency domain within the same UL CC, and is located in different uplink slots. One UL PRB is comprised, and one PRACH is comprised from six UL PRB pairs. For example, in FIG. 12, in the uplink subframe in the UL CC with the lowest frequency, the UL PRB with the lowest frequency in the first uplink slot and the UL PRB with the highest frequency in the second uplink slot , One UL PRB pair used for PUCCH is configured. For example, in FIG. 12, in an uplink subframe in the UL CC with the lowest frequency, six UL PRBs that continue in the frequency domain from the third lowest frequency UL PRB pair to the higher frequency direction. One PRACH is configured from the pair. For example, in FIG. 12, in an uplink subframe in the UL CC having the highest frequency, from the UL PRB pair having the fourth lowest frequency, six UL PRBs that are continuous in the frequency domain with respect to the direction in which the frequency is higher. One PRACH is configured from the pair.

  One or more PUSCHs and one or more PUCCHs are arranged in the uplink system band. The base station apparatus 3 can allocate one PUSCH resource to one UL CC with respect to one mobile station apparatus 5 corresponding to LTE. Moreover, the base station apparatus 3 can allocate one PUSCH resource for every UL CC with respect to one mobile station apparatus 5 corresponding to LTE-A. The mobile station apparatus 5 corresponding to LTE-A can transmit a signal using a plurality of PUSCH resources when a PUSCH resource is allocated by a plurality of UL CCs in the same uplink subframe. In addition, the base station apparatus 3 cannot allocate a plurality of PUSCH resources in the same UL CC in the same uplink subframe to one mobile station apparatus 5 corresponding to LTE-A. PUSCH resources can be assigned to different UL CCs. Note that the mobile station apparatus 5 uses only one PUCCH resource in the same uplink subframe. Further, when the PUCCH resource and the PUSCH resource are allocated in the same uplink subframe, the mobile station apparatus 5 corresponding to LTE transmits a signal using only the PUSCH resource. In addition, when the PUCCH resource and the PUSCH resource are allocated in the same uplink subframe, the mobile station apparatus 5 supporting LTE-A can perform only the PUSCH resource based on the instruction of the base station apparatus 3 notified in advance. A signal is transmitted using, or a signal is transmitted using both PUCCH resources and PUSCH resources.

  The UL CC to which the PUCCH resource is allocated is the uplink PCC, and the cell to which the PUCCH resource is allocated is the PCell. Moreover, when the mobile station apparatus 5 corresponding to LTE-A is set not to perform simultaneous transmission of PUSCH and PUCCH, when PUCCH resources and PUSCH resources are allocated in the same uplink subframe, The signal is transmitted using only PUSCH resources. Moreover, when the mobile station apparatus 5 corresponding to LTE-A is set to perform simultaneous transmission of PUSCH and PUCCH, when PUCCH resources and PUSCH resources are allocated in the same uplink subframe, Basically, signals can be transmitted using both PUCCH resources and PUSCH resources.

  One or more PRACHs can be arranged in the uplink system band. In a certain uplink subframe, only one PRACH can be arranged in the UL CC, and a plurality of PRACHs are not arranged. Basically, the mobile station apparatus 5 can use only one PRACH of one UL CC in a certain uplink subframe. The base station apparatus 3 can control in which UL subframe and in which UL PRB pair the PRACH is arranged in each UL CC. The mobile station apparatus 5 can execute a random access procedure for an initial connection and a scheduling request (resource allocation request) using the PRACH of the PCell. The mobile station device 5 can execute a random access procedure for measuring an uplink synchronization shift using the PRACHs of the PCell and SCell while being connected to the base station device 3. Here, the connection state can also be said to be a state in which parameters in the MAC layer, RRC (Radio Resource Control) layer, etc. are appropriately set and held.

  The PRACH is a channel used for the mobile station apparatus 5 to transmit a preamble sequence used for estimating an uplink transmission timing adjustment value in the base station apparatus 3, and has a guard time. As the preamble sequence, 64 types of sequences are prepared, and are configured to express 6-bit information.

  A series of procedures related to transmission / reception of PRACH, transmission / reception of responses, and the like are referred to as random access procedures. There are two types of random access procedures: a contention based random access (contention based random access) procedure and a non-contention based random access (non-contention based random access) procedure. The Contention based Random Access procedure is a random access procedure in which a collision may occur in the preamble sequence transmitted between the mobile station devices 5. The collision of preamble sequences means that a plurality of mobile station apparatuses 5 transmit the same preamble sequence using the PRACH of the same frequency / time resource. Note that a preamble sequence collision is also referred to as a random access collision.

  The Contention based Random Access procedure is performed for initial connection in a state where the base station apparatus 3 is not connected (communication), or for notification of a scheduling request while being connected to the base station apparatus 3. The non-contention based random access procedure is a random access procedure in which there is no possibility of collision in the preamble sequence transmitted between the mobile station devices 5. Non-contention based Random Access procedure is an appropriate uplink when the base station apparatus 3 and the mobile station apparatus 5 are connected but the uplink is out of synchronization (not established or released). This is done to set the transmission timing. Here, when uplink synchronization is out of sync, when the uplink transmission timing adjustment value is not notified, when the valid period of the notified uplink transmission timing adjustment value has passed, it is notified. This means a case where the adjusted uplink transmission timing adjustment value is reset.

  In the Non-contention based Random Access procedure, the base station apparatus 3 notifies the mobile station apparatus 5 of information indicating a preamble (RACH preamble) sequence to be transmitted on the PRACH using the PDCCH, for example. The mobile station apparatus 5 transmits the preamble sequence indicated by the information included in the received PDCCH to the base station apparatus 3 using the PRACH in the UL CC of the cell. Note that the RACH preamble that is explicitly assigned by the base station apparatus 3 is referred to as a dedicated preamble. Further, in this way, an instruction by PDCCH including information indicating a preamble sequence is referred to as a PDCCH order. The preamble sequence used in the Contention based Random Access procedure is used by the mobile station apparatus 5 randomly selecting one preamble sequence from the preamble sequence that is not used as the Dedicated preamble when starting the random access procedure. Among the preamble sequences that can be used by the mobile station apparatus 5 in a certain cell, information indicating the number of preamble sequences used in each of the contention based random access procedure and the non-contention based random access procedure is base information as system information. A notification is sent from the station device 3 to the mobile station device 5.

  Since the present application is mainly related to the Non-contention based Random Access procedure, in the following description, the description regarding the Contention based Random Access procedure is omitted as appropriate.

  The uplink pilot channel is used for demodulating a pilot channel (DM RS: Demodulation Reference Signal) used for estimating PUSCH and PUCCH propagation path fluctuations, and for PUSCH frequency scheduling and adaptive modulation of the base station apparatus 3. Channel quality, and a reference pilot channel (SRS: Sounding Reference Signal) used for measurement of synchronization deviation between the base station apparatus 3 and the mobile station apparatus 5. The uplink pilot channel is used to transmit an uplink reference signal (UL RS). Here, the uplink reference signal is a known signal in the communication system 1. DM RSs are arranged in different SC-FDMA symbols depending on whether they are arranged in the same UL PRB as PUSCH or in the same UL PRB as PUCCH.

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

  The SRS is arranged in the UL PRB determined by the base station apparatus 3, and the 14th SC-FDMA symbol in the uplink subframe (the seventh SC-FDMA symbol in the second uplink slot of the uplink subframe). ). The SRS can be arranged only in an uplink subframe (investigation reference signal subframe; referred to as SRS subframe) having a cycle determined by the base station apparatus 3 in the cell. For the SRS subframe, the base station apparatus 3 assigns a UL PRB, a period for transmitting the SRS for each mobile station apparatus 5. In addition, the setting (configuration) of the SRS subframe may be different for each cell (UL CC). Note that the SRS is set independently for each cell in the mobile station apparatus 5.

  Although FIG. 12 shows the case where the PUCCH is arranged in the UL PRB at the end in the frequency domain of each UL CC, the UL PRB such as the second and third from the end of the UL CC may be used for the PUCCH. Good.

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

  In the communication system 1 according to the embodiment of the present invention, the OFDM scheme is applied in the downlink, and the NxDFT-Spread OFDM scheme is applied in the uplink. Here, the NxDFT-Spread OFDM scheme is a scheme for transmitting and receiving signals using the DFT-Spread OFDM scheme in units of uplink component carriers, and a plurality of NxDFT-Spread OFDM schemes in the uplink subframe of the communication system 1 using a plurality of UL CCs. This is a method of performing communication using a processing unit related to DFT-Spread OFDM transmission / reception.

  In the time domain, the PDSCH resource is arranged in the same downlink subframe as the downlink subframe in which the PDCCH resource including the downlink assignment used for the allocation of the PDSCH resource is arranged, and in the frequency domain. , It is arranged in the same DL CC as the PDCCH including the downlink assignment used for allocation of the resource of the PDSCH, or in a different DL CC.

  DCI includes information indicating which DL CC the downlink assignment corresponds to the PDSCH transmitted on which DL CC, or which UL CC the PUSCH transmitted on which UL CC (hereinafter referred to as a “carrier indicator”). (Referred to as “carrier indicator”). When the downlink assignment does not include a carrier indicator, the downlink assignment corresponds to the PDSCH of the same DL CC as the DL CC to which the downlink assignment is transmitted. When the carrier grant is not included in the uplink grant, the uplink grant corresponds to the UL CC PUSCH associated with the DL CC to which the uplink grant is transmitted in advance. When the carrier indicator is not included in the DCI, the information indicating the correspondence between the DL CC and the UL CC used for the interpretation of the uplink grant resource allocation is the base station before the communication of information data is performed. Notification is sent from the device 3 to the mobile station device 5 using system information.

<Example of cell and component carrier configuration>
FIG. 13 is a diagram illustrating an example of a cell aggregation configuration configured in the mobile station apparatus 5 according to the embodiment of the present invention. In this figure, the case where four cells (Cell1, Cell2, Cell3, Cell4) are comprised is shown. In this figure, both DL CC (DL CC1) and UL CC (UL CC1) are configured in Cell1, both DL CC (DL CC2) and UL CC (UL CC2) are configured in Cell2, and DL CC is configured in Cell3. (DL CC3) and UL CC (UL CC3) are both configured, and Cell 4 shows a case where only DL CC (DL CC4) is configured. Note that the present invention is not limited to the cell aggregation configuration example shown in FIG.

  In FIG. 13, DL_CC1 and UL_CC1, DL_CC2 and UL_CC2, and DL_CC3 and UL_CC3 are cell-specific connections (Cell Specific Linkage). In addition, as in Cell 4 in which only DL_CC 4 is configured, a cell having no UL CC (no cell-specific connection) and only DL CC can be configured in cell aggregation.

  The cell-specific connection is a correspondence relationship (linkage relationship, link information) between uplink and downlink CC, and typically corresponds to a part of broadcast information (system information) (SIB2: System Information Block Type2). The relationship is shown. The cell-specific connection is also referred to as SIB2 linkage, and the setting (configuration) is explicitly notified as part of the broadcast information. Alternatively, in the cell specific connection, when a cell in cell aggregation is added, the setting of the correspondence relationship is notified by an RRC message (layer 3 message). Alternatively, when the cell specific connection is not explicitly instructed (the correspondence relationship between the uplink and the downlink CC is not directly and explicitly indicated by the explicit information), the uplink and downlink regulations that are uniquely determined The setting is notified implicitly, for example, by using the information on the correspondence relationship. When the setting of the correspondence relationship between the DL CC and the UL CC in the cell is notified by the RRC message, the base station apparatus 3 supports a UL CC different from the UL CC indicated by the broadcast information of the DL CC to be set. The mobile station apparatus 5 may be notified of cell-specific connection information indicating this. In other words, the setting indicated by the RRC message may be overwritten on the setting indicated by the broadcast information.

  The cell-specific connection is typically used to indicate a correspondence relationship between uplink and downlink frequencies used for communication with the base station device 3 when the mobile station device 5 does not use cell aggregation. . In addition, when the mobile station apparatus 5 uses cell aggregation, the cell-specific connection is performed on the uplink and downlink CCs to which the allocation of resources (PUSCH resource, PDSCH resource) notified by the PDCCH is applied. Used to indicate correspondence.

<Cross carrier scheduling>
A PDCCH and a PDSCH including a downlink assignment corresponding to the PDCCH can be arranged in different DL CCs (referred to as cross carrier scheduling). The DL CC in which the PDSCH is arranged is referred to as a physical downlink shared channel component carrier (PDSCH CC). The DL CC in which the PDCCH is arranged is referred to as a physical downlink control channel component carrier (PDCCH CC). In addition, when there is a possibility that PDSCH is arranged in all DL CCs used in cell aggregation, all DL CCs are PDSCH CCs.

  The DL CC in which the PDCCH is arranged, the UL CC in which the PUSCH including the uplink grant corresponding to the PDCCH is arranged, and the DL CC associated in the system information can be set differently. The base station apparatus 3 notifies the mobile station apparatus 5 of system information for each DL CC, and the system information includes information indicating the UL CC associated with the DL CC. The system information including information indicating this association is referred to as SIB2 (System Information Block Type 2), and the association between DL CC and UL CC indicated by SIB2 is referred to as SIB2 linkage. The UL CC in which the PUSCH is arranged is referred to as a physical uplink shared channel component carrier (PUSCH CC).

  The base station apparatus 3 determines which DL CC is used as the PDCCH CC among the plurality of DL CCs used for cell aggregation. Next, the base station apparatus 3 determines which PDSCH CC and which PUSCH CC each PDCCH CC is associated with. Here, the association between the PDCCH CC and the PDSCH CC means that a PDCCH including control information related to allocation of PDSCH resources arranged in the PDSCH CC is arranged in the PDCCH CC associated with the PDSCH CC. More specifically, the association between the PDCCH CC and the PDSCH CC is a downlink assignment corresponding to the PDSCH arranged in the PDSCH CC, and the PDCCH including the downlink assignment that also configures the carrier indicator is the PDSCH. It means that it is arranged on the PDCCH CC associated with the CC. Here, the association between the PDCCH CC and the PUSCH CC means that the PDCCH including control information related to the allocation of PUSCH resources arranged in the PUSCH CC is arranged in the PDCCH CC associated with the PUSCH CC. More specifically, the association between the PDCCH CC and the PUSCH CC is an uplink grant corresponding to the PUSCH arranged in the PUSCH CC, and the PDCCH including the uplink grant in which the carrier indicator is also configured is the PUSCH CC. This means that it is arranged in the associated PDCCH CC.

  The association described here is different from the association (SIB2 link) between the DL CC and the UL CC for the PDCCH that does not include the carrier indicator, as described above. Each of a plurality of PDSCH CCs used for cell aggregation may be associated with the same PDCCH CC, or each of a plurality of PDSCH CCs used for cell aggregation may be associated with a different PDCCH CC. For example, when a plurality of PDSCH CCs are associated with one PDCCH CC, the carrier indicator recognizes which PDSCH CC transmitted by the PDCCH CC indicates the PDSCH resource allocation.

  The base station apparatus 3 notifies the mobile station apparatus 5 of information indicating the downlink component carrier associated with each PDSCH CC as a PDCCH CC. This information is notified using radio resource control signaling (RRC signaling). On the basis of the information notified from the base station device 3 using RRC signaling, the mobile station device 5 is provided with a DL CC in which a PDCCH including a downlink assignment with a PDSCH carrier indicator of each PDSCH CC may be arranged. Recognize In addition, PDCCH including the downlink assignment of PDSCH transmitted by PCell is transmitted only by PCell, and PDCCH including the downlink assignment of PDSCH transmitted by SCell is transmitted by PCell or SCell. In other words, the PDCCH CC and the PDSCH CC are always configured in the PCell, and the PDCCH CC and the PDSCH CC configured in the PCell are associated with each other. Also, the PCell PUSCH CC is associated with the PCell PDCCH CC. PCell PDSCH CC and PUSCH CC have SIB2 linkage. In SCell, PDSCH CC is configured, but PDCCH CC may not be configured. PDCCH CC matched with PDSCH CC comprised by SCell may be comprised by PCell, and may be comprised by other SCell. A PDSCH CC and a PUSCH CC are always configured in a cell in which a PDCCH CC is configured, and a PDCCH CC and a PDSCH CC, and a PDCCH CC and a PUSCH CC in the same cell are associated with each other. In addition, RRC signaling is notified by PDSCH. In addition, since PDSCH CC matched with PDSCH CC and PUSCH CC of PCell is always comprised by the same PCell, the information which shows those relationship is not notified with respect to the mobile station apparatus 5. FIG. Also, when cross carrier scheduling is not applied, information indicating the association between the PDSCH CC and the PDCCH CC is not notified from the base station device 3 to the mobile station device 5. When Cross carrier scheduling is not applied, a carrier indicator is not included in the downlink assignment.

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

  The reception processing unit 101 demodulates and decodes received signals of PUCCH and PUSCH received from the mobile station apparatus 5 by the reception antenna 109 from the mobile station apparatus 5 using the DM RS according to an instruction from the control unit 105, and obtains control information and information data. Extract. The reception processing unit 101 performs a process of extracting UCI from an uplink subframe, UL PRB, to which the own apparatus assigns PUCCH resources to the mobile station apparatus 5. The reception processing unit 101 is instructed from the control unit 105 what processing is to be performed on which uplink subframe and which UL PRB. For example, the reception processing unit 101 instructs the control unit 105 to perform detection processing for multiplying and combining code sequences in the time domain and multiplying and combining code sequences in the frequency domain with respect to ACK / NACK PUCCH signals. Is done. Reception processing section 101 is instructed by control section 105 to use a frequency-domain code sequence and / or a time-domain code series used for processing for detecting UCI from PUCCH. The reception processing unit 101 outputs the extracted UCI to the control unit 105 and outputs information data to the upper layer.

  Also, the reception processing unit 101 detects (receives) a preamble sequence from the received PRACH signal received from the mobile station apparatus 5 by the reception antenna 109 in accordance with an instruction from the control unit 105. The reception processing unit 101 also estimates arrival timing (reception timing) along with detection of the preamble sequence. The reception processing unit 101 performs processing for detecting a preamble sequence for an uplink subframe, UL PRB, to which the own apparatus has assigned PRACH resources. Note that the reception processing unit 101 receives a received PRACH signal in a preamble sequence that is not used in the contention based random access procedure and that is not assigned as a dedicated preamble to any mobile station device 5. Therefore, processing such as detection of whether or not the preamble sequence has been transmitted and estimation of arrival timing can be prevented. The reception processing unit 101 outputs information regarding the estimated arrival timing to the control unit 105.

  In addition, the reception processing unit 101 measures the channel quality of one or more uplink resource blocks using the SRS received from the mobile station apparatus 5. Also, the reception processing unit 101 detects (calculates and measures) an uplink synchronization shift using the SRS received from the mobile station apparatus 5. The reception processing unit 101 is instructed from the control unit 105 what processing is to be performed on which uplink subframe and which uplink resource block. The reception processing unit 101 outputs information regarding the measured channel quality and the detected uplink synchronization shift to the control unit 105. Details of the reception processing unit 101 will be described later.

  The radio resource control unit 103 allocates a resource (uplink subframe, UL PRB) to the PRACH, allocates a dedicated preamble, allocates a resource to the SRS, allocates a resource to the PDCCH, allocates a resource to the PUCCH, and assigns a DL PRB to the PDSCH. Allocation, UL PRB allocation to PUSCH, various channel modulation schemes, coding rates, transmission power control values, etc. are set. Radio resource control section 103 also sets a frequency domain code sequence, a time domain code sequence, and the like for PUCCH. Also, the radio resource control unit 103 outputs information indicating allocation of the set Dedicated preamble to the control unit 105. Part of the information set by the radio resource control unit 103 is notified to the mobile station device 5 via the transmission processing unit 107. For example, information indicating the allocation of the dedicated preamble and information indicating the allocation of the resource to the PRACH are the mobile station device. 5 is notified.

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

  The radio resource control unit 103 configures a plurality of DL CCs and a plurality of UL CCs for the mobile station device 5 when the own device performs communication using cell aggregation. Also, the radio resource control unit 103 sets PDSCH CC, PCell, and SCell associated with the PDCCH CC and PDCCH CC for the mobile station apparatus 5. The radio resource control unit 103 transmits information indicating which cell is set as a PCell via the transmission processing unit 107, and information indicating a DL CC associated as a PDCCH CC with respect to the PDSCH CC of each SCell. It outputs to the control part 105 so that the apparatus 5 may be notified. Note that the radio resource control unit 103 automatically sets the cell to which the mobile station device 5 is connected by the initial connection as a PCell, adds the SCell, and information on the added SCell (DL CC frequency, frequency band, UL CC Frequency, frequency band, cell index) may be notified to the mobile station apparatus 5. The radio resource control unit 103 downloads the unconnected cells (cells not used for data channel transmission / reception, cells not configured by cell aggregation) acquired (received or notified) from the mobile station device 5 using the PUSCH. Based on link reception quality (RSRP: Reference Signal Received Power), etc., unconnected cells are added to the mobile station apparatus 5 as connected cells (cells used for data channel transmission / reception, cells configured by cell aggregation). Determine whether to do. For example, when the radio resource control unit 103 determines that the downlink priority quality of a non-connected cell is good, the radio resource control unit 103 additionally sets the non-connected cell as a connected cell in the mobile station apparatus 5.

  The radio resource control unit 103 outputs various control signals to the control unit 105. For example, the control signal is a control signal indicating the assignment of the dedicated preamble. For example, the radio resource control unit 103 outputs a dedicated preamble sequence, an uplink subframe in which a PRACH permitting transmission of the dedicated preamble is arranged, and a control signal indicating the UL PRB.

  Based on the control signal input from the radio resource control unit 103, the control unit 105 assigns a DL PRB to the PDSCH, assigns resources to the PDCCH, sets a modulation scheme for the PDSCH, sets a coding rate for the PDSCH and the PDCCH, etc. Control is performed on the transmission processing unit 107. Further, the control unit 105 generates DCI transmitted using the PDCCH based on the control signal input from the radio resource control unit 103 and outputs the DCI to the transmission processing unit 107. The DCI transmitted using the PDCCH includes a downlink assignment that does not include information related to the PDCCH order, a downlink assignment that includes information related to the PDCCH order, and an uplink grant. Also, the control unit 105 performs transmission processing on information indicating DL CC and UL CC used for communication, information indicating PCell, information indicating association between PDSCH CC and PDCCH CC, information indicating resource allocation of PRACH, and the like. Control is performed to transmit to the mobile station apparatus 5 using the PDSCH via the unit 107.

  Based on the control signal input from the radio resource control unit 103, the control unit 105 allocates resources (uplink subframe, UL PRB) to PRACH, allocates dedicated preamble, allocates UL PRB to PUSCH, and allocates resources to PUCCH. Control such as allocation, PUSCH and PUCCH modulation scheme setting, PUSCH coding rate setting, PUCCH detection processing, and PUCCH code sequence setting are performed on reception processing section 101. In addition, the control unit 105 receives the UCI transmitted from the mobile station apparatus 5 using PUCCH from the reception processing unit 101 and outputs the input UCI to the radio resource control unit 103.

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

  When the reception processing unit 101 detects (receives) a preamble sequence, the control unit 105 generates information indicating a response to the transmission of the preamble sequence of the mobile station apparatus 5. Information indicating the generated response is transmitted to the mobile station device 5 via the transmission processing unit 107. The information indicating the response to the transmission of the dedicated preamble includes information indicating the adjustment value of the uplink transmission timing. The information indicating the response to the transmission of the Dedicated preamble includes information indicating a Random ID (also referred to as a Random Access Preamble Identifier) that is an identifier corresponding to the preamble sequence. The Random ID is composed of 6 bits, is assigned in advance to each of the 64 preamble sequences, and is information for identifying the preamble sequence. The relationship between the Random ID and the preamble sequence is determined as a communication system rule.

  When it is determined that the transmission timing adjustment (fine adjustment) needs to be performed based on the information indicating the uplink synchronization shift detected from the received SRS, the control unit 105 indicates the transmission timing adjustment value. Generate information. The generated information is transmitted to the mobile station device 5 via the transmission processing unit 107. In this case, the information indicating the adjustment value of the transmission timing is transmitted together with information indicating a C-RNTI (Cell Radio Network Temporary Identifier) which is a mobile station apparatus identifier assigned to the mobile station apparatus 5 in advance. C-RNTI is information for identifying the mobile station apparatus 5 in which a connection (RRC connection) with the base station apparatus 3 is established in a cell managed by the base station apparatus 3. The base station device 3 assigns C-RNTI to the mobile station device 5 when establishing a connection with the mobile station device 5.

  When detecting (receiving) the dedicated preamble, the control unit 105 receives, as a response to the reception of the preamble sequence, information indicating the Random ID corresponding to the detected dedicated preamble and the cell detecting (receiving) the dedicated preamble. Information indicating an adjustment value for uplink transmission timing is generated, and the generated information is controlled to be transmitted to the mobile station apparatus 5 via the transmission processing unit 107. More specifically, when detecting (receiving) the dedicated preamble in the uplink, the control unit 105 generates an RA-RNTI (Random Access-Radio Network Temporary Identifier) as a response to reception of the preamble sequence. The transmission processing unit 107 is controlled to transmit the indicated information on the downlink PDCCH, and information indicating the Random ID corresponding to the detected dedicated preamble and the uplink for the cell in which the detected dedicated preamble is detected (received) The transmission processing unit 107 is controlled so as to transmit information indicating the transmission timing adjustment value on the downlink PDSCH. Here, the information indicating the resource allocation of the PDSCH is included in the PDCCH including information indicating the RA-RNTI. RA-RNTI corresponds to PRACH and indicates which random access response corresponding to which PRACH is included in PDSCH information in which resource allocation is indicated by PDCCH. For example, the number of an uplink subframe in which PRACH is arranged Is associated. Here, in detail, a bit (scrambled) obtained by performing exclusive OR processing using RA-RNTI on a CRC code generated from DCI using a predetermined generator polynomial ( A signal obtained by modulating (information) is transmitted on the PDCCH.

  When the control unit 105 generates the information indicating the transmission timing adjustment value generated based on the information indicating the uplink synchronization shift detected from the received SRS, the control unit 105 preliminarily assigns the C-RNTI to the mobile station device 5. The transmission processing unit 107 is controlled to transmit information indicating the transmission timing on the downlink PDCCH, and the transmission processing unit 107 is controlled to transmit information indicating the adjustment value of the transmission timing on the downlink PDSCH. Here, the information indicating the resource allocation of the PDSCH is included in the PDCCH including information indicating the C-RNTI. Here, in detail, a bit (which is scrambled) is subjected to exclusive OR processing using C-RNTI on a CRC code generated from DCI using a predetermined generator polynomial ( A signal obtained by modulating (information) is transmitted on the PDCCH.

  The control unit 105 manages the cells assigned (configured) to the mobile station apparatus 5. The control unit 105 groups cells having the same transmission timing. This group is referred to as a transmission timing group (TA group). A common TA command is applied to a plurality of cells in the TA group. Information regarding the configuration of the TA group can be notified to the mobile station device 5 via the transmission processing unit 107. The control unit 105 manages a transmission timing and a transmission timing timer (referred to as a TA timer) for each cell or each TA group. The TA timer is a timer used for measuring a period during which the TA command notified to the mobile station apparatus 5 is valid and determining whether the uplink is in a synchronous state or an asynchronous state. While the TA timer is operating, it is determined that the uplink of the TA group corresponding to the TA timer is in a synchronized state (a state in which transmission timing is valid). When the TA timer ends, it is determined that the uplink of the TA group corresponding to the TA timer is in an asynchronous state (a state in which transmission timing is not valid). The control unit 105 performs the TA group setting based on information (TA assistance information) (timing related information) notified from the mobile station apparatus 5. Details will be described later.

  Note that only one TA timer may be used for the mobile station apparatus 5, and one TA timer may be used in common for all TA groups (cells). Even in this case, the concept of TA group is used to specify a cell group to which a certain TA command is commonly applied. In other words, one TA timer is commonly used for a plurality of TA groups, but a plurality of TA commands may be used independently for each TA group.

  The transmission processing unit 107 generates a signal to be transmitted using PDCCH and PDSCH based on the control signal input from the control unit 105, and transmits the signal through the transmission antenna 111. The transmission processing unit 107 is input from the radio resource control unit 103, information indicating DL CC and UL CC used for communication using cell aggregation, information indicating PCell, information indicating association between PDSCH CC and PDCCH CC , Information indicating PRACH resources, information data input from an upper layer, and the like are transmitted to the mobile station apparatus 5 using the PDSCH, and DCI (information on the PDCCH order) input from the control unit 105 is used using the PDCCH. To the mobile station apparatus 5. Also, the transmission processing unit 107 transmits a response to reception of the preamble sequence generated by the control unit 105 and information indicating the transmission timing adjustment value using the PDCCH and PDSCH. For the sake of simplification of explanation, hereinafter, the information data is assumed to include information on several types of control. Details of the transmission processing unit 107 will be described later.

  The base station apparatus 3 communicates with the mobile station apparatus 5 using a plurality of connected cells (cells used for transmission / reception of data channels, cells configured by cell aggregation), and non-connected cells (data channel Information indicating downlink reception quality (RSRP: Reference Signal Received Power) of cells not used for transmission and reception, and cells not configured with cell aggregation, and received signals of unconnected cells whose reception quality is measured Information indicating that the difference in reception timing with the received signal in the cell is greater than or equal to the predetermined time, or the difference in reception timing between the received signal in the non-connected cell and the received signal in the connected cell within the predetermined time. And timing related information (TA assistance information) configured by any of the information indicating the connected cell. When a non-connected cell is configured as a connected cell (a cell not configured for cell aggregation is newly used or added for cell aggregation), a group of transmission timings based on timing related information is received. Set up.

<Configuration of transmission processing unit 107 of base station apparatus 3>
Hereinafter, details of the transmission processing unit 107 of the base station apparatus 3 will be described. FIG. 2 is a schematic block diagram showing the configuration of the transmission processing unit 107 of the base station apparatus 3 according to the embodiment of the present invention. As shown in this figure, the transmission processing unit 107 includes a plurality of physical downlink shared channel processing units 201-1 to 201-M (hereinafter referred to as physical downlink shared channel processing units 201-1 to 201-M). Physical downlink), a plurality of physical downlink control channel processing units 203-1 to 203-M (hereinafter, physical downlink control channel processing units 203-1 to 203-M are combined). Control channel processing unit 203), downlink pilot channel processing unit 205, multiplexing unit 207, IFFT (Inverse Fast Fourier Transform) unit 209, GI (Guard Interval) insertion unit 211, D / A (Digital / Analog converter) unit 213, transmission RF (Radio Frequency) unit 21 5 and the transmission antenna 111. Since each physical downlink shared channel processing unit 201 and each physical downlink control channel processing unit 203 have the same configuration and function, only one of them will be described as a representative. Although the case where the number of transmission antennas is one will be described here, a plurality of transmission antennas may be configured.

  As shown in this figure, the physical downlink shared channel processing unit 201 includes a turbo coding unit 219 and a data modulation unit 221, respectively. Also, as shown in this figure, the physical downlink control channel processing unit 203 includes a convolutional coding unit 223 and a QPSK modulation unit 225. The physical downlink shared channel processing unit 201 performs baseband signal processing for transmitting information data to the mobile station apparatus 5 by the OFDM method. The turbo encoding unit 219 performs turbo encoding for increasing the error tolerance of the data at the encoding rate input from the control unit 105 and outputs the input information data to the data modulation unit 221. The data modulation unit 221 uses the data encoded by the turbo coding unit 219 as a modulation method inputted from the control unit 105, for example, QPSK (Quadrature Phase Shift Keying), 16QAM (16-value quadrature amplitude modulation). Modulation with a modulation scheme such as 16 Quadrature Amplitude Modulation) or 64QAM (64 Quadrature Amplitude Modulation) to generate a signal sequence of modulation symbols. The data modulation unit 221 outputs the generated signal sequence to the multiplexing unit 207.

  The physical downlink control channel processing unit 203 performs baseband signal processing for transmitting the DCI input from the control unit 105 in the OFDM scheme. The convolutional coding unit 223 performs convolutional coding for increasing DCI error tolerance based on the coding rate input from the control unit 105. Here, DCI is controlled in bit units. The convolutional coding unit 223 also performs rate matching to adjust the number of output bits for the bits subjected to the convolutional coding processing based on the coding rate input from the control unit 105. The convolutional coding unit 223 outputs the encoded DCI to the QPSK modulation unit 225. The QPSK modulation unit 225 modulates the DCI encoded by the convolutional coding unit 223 using the QPSK modulation method, and outputs the modulated modulation symbol signal sequence to the multiplexing unit 207. The downlink pilot channel processing unit 205 generates a downlink reference signal (also referred to as Cell specific RS) that is a known signal in the mobile station apparatus 5 and outputs the downlink reference signal to the multiplexing unit 207.

  Multiplexer 207 receives a signal input from downlink pilot channel processor 205, a signal input from each physical downlink shared channel processor 201, and a signal input from each physical downlink control channel processor 203. Are multiplexed into the downlink subframe according to the instruction from the control unit 105. Control signals related to DL PRB allocation to PDSCH and resource allocation to PDCCH set by radio resource control section 103 are input to control section 105, and control section 105 controls processing of multiplexing section 207 based on the control signal. .

  Note that the multiplexing unit 207 performs multiplexing of PDSCH and PDCCH by time multiplexing basically as shown in FIG. The multiplexing unit 207 performs multiplexing between the downlink pilot channel and other channels by time / frequency multiplexing. The multiplexing unit 207 may multiplex PDSCHs addressed to each mobile station device 5 in units of DL PRB pairs, and may multiplex PDSCHs for one mobile station device 5 using a plurality of DL PRB pairs. Further, multiplexing section 207 performs multiplexing of PDCCH addressed to each mobile station apparatus 5 using resources in the same DL CC. The multiplexing unit 207 outputs the multiplexed signal to the IFFT unit 209.

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

<Configuration of Reception Processing Unit 101 of Base Station Device 3>
Hereinafter, details of the reception processing unit 101 of the base station apparatus 3 will be described. FIG. 3 is a schematic block diagram showing the configuration of the reception processing unit 101 of the base station apparatus 3 according to the embodiment of the present invention. As shown in this figure, the reception processing unit 101 includes a reception RF unit 301, an A / D (Analog / Digital converter) unit 303, a component carrier separation unit 305, and a plurality of uplink component carrier reception processing units. 307-1 to 307-M (hereinafter, each uplink component carrier reception processing unit 307-1 to 307-M is referred to as an uplink component carrier reception processing unit 307). Also, as shown in this figure, the uplink component carrier reception processing unit 307 includes a symbol timing detection unit 309, a GI removal unit 311, an FFT unit 313, a subcarrier demapping unit 315, a propagation path estimation unit 317, and a PUSCH Channel equalization unit 319, PUCCH channel equalization unit 321, IDFT unit 323, data demodulation unit 325, turbo decoding unit 327, physical uplink control channel detection unit 329, preamble detection unit 331, and SRS processing unit 333 is provided. Since each uplink component carrier reception processing unit 307 has the same configuration and function, only one of them will be described as a representative.

  The reception RF unit 301 appropriately amplifies the signal received by the reception antenna 109, converts it to an intermediate frequency (down-conversion), removes unnecessary frequency components, and amplifies the signal level so that the signal level is appropriately maintained. The level is controlled, and quadrature demodulation is performed based on the in-phase component and the quadrature component of the received signal. The reception RF unit 301 outputs the quadrature demodulated analog signal to the A / D unit 303. The A / D unit 303 converts the analog signal quadrature demodulated by the reception RF unit 301 into a digital signal, and outputs the converted digital signal to the component carrier separation unit 305. The component carrier demultiplexing unit 305 demultiplexes the received signal of the uplink system bandwidth for each UL CC, and outputs it to the reception processing unit 307 for each uplink component carrier.

  The reception processing unit 307 for each uplink component carrier performs demodulation and decoding of PUSCH and PUCCH in the UL CC to detect information data and UCI, detects a preamble to detect arrival timing, processes an SRS, and performs uplink processing. Detect link loss of synchronization.

  The symbol timing detection unit 309 detects a symbol timing based on the signal input from the component carrier separation unit 305, and outputs a control signal indicating the detected symbol boundary timing to the GI removal unit 311. The GI removal unit 311 removes a portion corresponding to the guard interval from the signal input from the component carrier separation unit 305 based on the control signal from the symbol timing detection unit 309, and converts the remaining portion of the signal to the FFT unit 313. Output to. The FFT unit 313 performs fast Fourier transform on the signal input from the GI removal unit 311, performs demodulation of the DFT-Spread-OFDM scheme, and outputs the result to the subcarrier demapping unit 315. Note that the number of points in the FFT unit 313 is equal to the number of points in the IFFT unit of the mobile station apparatus 5 described later.

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

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

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

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

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

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

  Based on the signal input from component carrier separation section 305, preamble detection section 331 performs processing for detecting (receiving) the preamble transmitted for the received signal corresponding to PRACH. Specifically, the preamble detection unit 331 performs correlation processing on a received signal at various timings within the guard time with a replica signal generated using each preamble sequence that may be transmitted. . For example, if the correlation value is higher than a preset threshold value, the preamble detection unit 331 receives from the mobile station device 5 the same signal as the preamble sequence used to generate the replica signal used for the correlation processing. Judge that it was sent. The preamble detection unit 331 determines that the timing with the highest correlation value is the arrival timing of the preamble sequence. The preamble detection unit 331 generates preamble detection information including at least information indicating the detected preamble sequence and information indicating arrival timing, and outputs the preamble detection information to the control unit 105.

  Based on the control information (DCI) transmitted from the base station device 3 to the mobile station device 5 using the PDCCH and the control information transmitted using the PDSCH, the control unit 105 includes a subcarrier demapping unit 315, data Control of demodulation section 325, turbo decoding section 327, propagation path estimation section 317, and physical uplink control channel detection section 329 is performed. Also, the control unit 105 determines which resource is the PRACH, PUSCH, PUCCH, and SRS that each mobile station device 5 has transmitted (may have transmitted) based on the control information that the base station device 3 has transmitted to the mobile station device 5. It is grasped whether it is comprised by (uplink sub-frame, UL PRB, preamble sequence, frequency domain code sequence, time domain code sequence).

<Overall configuration of mobile station apparatus 5>
Hereinafter, the configuration of the mobile station apparatus 5 according to the present embodiment will be described with reference to FIGS. 4, 5, and 6. FIG. 4 is a schematic block diagram showing the configuration of the mobile station apparatus 5 according to the embodiment of the present invention. As shown in this figure, the mobile station apparatus 5 includes a reception processing unit 401, a radio resource control unit 403, a control unit 405, and a transmission processing unit 407 (transmission unit). In addition, the control unit 405 includes a measurement report generation unit 4051.

  The reception processing unit 401 receives a signal from the base station apparatus 3, and demodulates and decodes the received signal in accordance with an instruction from the control unit 405. When the reception processing unit 401 detects a PDCCH signal addressed to itself, the reception processing unit 401 outputs the DCI obtained by decoding the PDCCH signal to the control unit 405. For example, the reception processing unit 401 outputs, to the control unit 405, control information related to the allocation of the dedicated preamble included in the PDCCH. In addition, the reception processing unit 401 receives, via the control unit 405, information data obtained by decoding the PDSCH addressed to itself based on an instruction from the control unit 405 after outputting the DCI included in the PDCCH to the control unit 405. To the upper layer. In the DCI included in the PDCCH, a downlink assignment that does not include information regarding Dedicated preamble allocation includes information indicating PDSCH resource allocation. Also, the reception processing unit 401 outputs the control information generated by the radio resource control unit 103 of the base station apparatus 3 obtained by decoding the PDSCH to the control unit 405, and the radio of the own apparatus via the control unit 405. Output to the resource control unit 403. For example, the control information generated by the radio resource control unit 103 of the base station apparatus 3 includes information indicating PCell, information indicating association between PDSCH CC and PDCCH CC, and information indicating resource allocation of PRACH.

  Further, the reception processing unit 401 outputs a cyclic redundancy check (CRC) code included in the PDSCH to the control unit 405. Although omitted in the description of the base station apparatus 3, the transmission processing unit 107 of the base station apparatus 3 generates a CRC code from the information data, and transmits the information data and the CRC code by PDSCH. The CRC code is used to determine whether the data included in the PDSCH is incorrect or not. If the CRC code is the same as the information generated from the data using a predetermined generator polynomial, the data is If it is determined that there is no error and the information generated from the data using a predetermined generator polynomial is different from the CRC code, it is determined that the data is incorrect.

  Further, the reception processing unit 401 receives a response to the transmission of the dedicated preamble based on an instruction from the control unit 405. For example, the reception processing unit 401 receives information indicating the RA-RNTI corresponding to the PRACH used for transmitting the Dedicated preamble on the PDCCH, and transmits information indicating the Random ID corresponding to the transmitted Dedicated preamble and the Dedicated preamble. Information indicating the adjustment value of the uplink transmission timing for the cell is received on the PDSCH. In addition, the reception processing unit 401 receives information indicating the adjustment value of the transmission timing on the PDSCH separately from the response to the transmission of the dedicated preamble.

  Further, the reception processing unit 401 detects downlink reception timing of a cell (referred to as a non-connected cell) that is not used for transmission / reception of a data channel (PDSCH, PUSCH), and receives downlink reception quality (RSRP: Reference). (Signal Received Power; reference signal received power) is measured, and the detection result and the measurement result are output to the control unit 405. A non-connected cell means a cell that is not configured by cell aggregation, is a cell configured by cell aggregation, and is different from a cell (connected cell) used for data channel transmission / reception. In addition, the connection cell comprised by the cell aggregation of the mobile station apparatus 5 is comprised from the cell from which a frequency differs. Note that the reception processing unit 401 also detects the downlink reception timing of the connected cell, and the detection result is output to the control unit 405. Details of the reception processing unit 401 will be described later.

  The control unit 405 includes a measurement report generation unit 4051. The control unit 405 confirms the data transmitted from the base station device 3 using the PDSCH and input from the reception processing unit 401, outputs the information data to the upper layer in the data, and the base station device in the data The reception processing unit 401 and the transmission processing unit 407 are controlled based on the control information generated by the third radio resource control unit 103. Further, the control unit 405 controls the reception processing unit 401 and the transmission processing unit 407 based on an instruction from the radio resource control unit 403. For example, the control unit 405 controls the reception processing unit 401 for measurement of non-connected cells. Further, the control unit 405 controls the reception processing unit 401 and the transmission processing unit 407 based on DCI transmitted from the base station apparatus 3 using the PDCCH and input from the reception processing unit 401. Specifically, the control unit 405 controls the transmission processing unit 407 based on the detected downlink assignment including information regarding the allocation of the dedicated preamble. Specifically, the control unit 405 controls the reception processing unit 401 based on the detected downlink assignment that does not include information relating to the dedicated preamble assignment, and controls the transmission processing unit 407 based on the detected uplink grant. To do. In addition, the control unit 405 compares the data input from the reception processing unit 401 with the CRC code input from the reception processing unit 401 using a predetermined generator polynomial, and determines whether the data is incorrect. ACK / NACK is generated. Further, the control unit 405 generates SR and CQI based on an instruction from the radio resource control unit 403. Further, the control unit 405 controls the transmission timing of the signal of the transmission processing unit 407 based on the adjustment value of the uplink transmission timing notified from the base station apparatus 3. Details of adjustment of uplink transmission timing will be described later.

  The measurement report generation unit 4051 generates TA assistance information and transmits the information generated via the transmission processing unit 407 to the base station apparatus 3. Whether the measurement report generation unit 4051 notifies the base station apparatus 3 of the RSRP of the non-connected cell (non-connected cell, non-configured cell, non-serving cell, non-aggregated cell) input from the reception processing unit 401 Judge whether. For example, in the mobile station apparatus 5 in which a plurality of connected cells having different frequencies are configured, the measurement report generating unit 4051 receives the downlink reception quality of non-connected cells having a frequency different from any frequency used for the plurality of connected cells ( RSRP) is measured, and it is determined whether to notify the base station apparatus 3. For example, the measurement report generation unit 4051 determines that the RSRP of the non-connected cell is notified to the base station device 3 when the RSRP value of the non-connected cell is larger than the threshold value specified in advance by the base station device 3, When the RSRP value of the connected cell is smaller than the threshold specified in advance by the base station device 3, it is determined that the RSRP of the non-connected cell is not notified to the base station device 3. For example, when the RSRP value of the non-connected cell is larger than the RSRP value of the connected cell (Connected Cell, Configured Cell, serving Cell, aggregated Cell), the measurement report generation unit 4051 determines the RSRP of the non-connected cell as a base station. If it is determined to notify the device 3 and the RSRP value of the non-connected cell is smaller than the RSRP value of the connected cell, it is determined not to notify the base station device 3 of the RSRP of the non-connected cell. For example, when receiving a command (message) instructing notification of RSRP of a non-connected cell from the base station device 3, the measurement report generation unit 4051 determines to notify the base station device 3 of RSRP of the non-connected cell.

  When the measurement report generation unit 4051 determines to notify the base station apparatus 3 of the RSRP of the non-connected cell, the measurement report generation unit 4051 measures the difference in reception timing between the reception signal of the non-connection cell that measures RSRP and the reception signal of the connection cell ( To calculate. For example, the measurement report generation unit 4051 measures the difference in the reception timing of the received signal with respect to the connected cell having a different frequency from the non-connected cell having a frequency different from any frequency used for the plurality of connected cells. Specifically, the measurement report generation unit 4051 compares the reception timing information of the non-connected cell input from the reception processing unit 401 with the reception timing information of the connected cell. The measurement report generation unit 4051 determines whether or not the measured difference in reception timing is equal to or longer than a predetermined time. For example, as the predetermined time, a minimum time unit that can be adjusted using a TA command described later is used. Note that a value obtained by adding a time corresponding to a margin considering a detection error in the reception processing unit 401 to a minimum time unit that can be adjusted using the TA command may be used as the predetermined time. Based on the above determination, the measurement report generation unit 4051 generates either information indicating that the difference in reception timing is equal to or greater than a predetermined time or information indicating a connected cell whose reception timing difference is within the predetermined time. To do. For example, a cell index (ServCellIndex; an index for identifying a cell used for cell aggregation; SCellIndex; an index for identifying an SCell) is used as information indicating a connected cell. Then, the measurement report generation unit 4051 is either information indicating that the difference in reception timing is equal to or greater than a predetermined time or information indicating a connected cell whose difference in reception timing is within the predetermined time (TA assistance information). Then, the transmission processing unit 407 is controlled so as to transmit information indicating RSRP to the base station device 3. Note that the measurement report generation unit 4051 determines whether or not to generate TA assistance information based on the measurement configuration of the non-connected cell from the base station apparatus 3 (measurement configuration).

  Based on the information generated by the measurement report generating unit 4051 and notified from the mobile station apparatus 5, the base station apparatus 3 efficiently sets the TA group when setting the non-connected cell notified of the RSRP as the connected cell. Can be done. When the base station apparatus 3 is notified of the information indicating that the difference in reception timing is equal to or longer than the predetermined time, the base station apparatus 3 sets the non-connected cell to an independent TA group and independently notifies the TA command. When the random access procedure is used to adjust the transmission timing of cells other than the PCell, the mobile station apparatus 5 is instructed to execute the random access procedure in the non-connected cell set in the independent TA group. When the base station apparatus 3 is notified of information indicating a connected cell whose reception timing difference is within a predetermined time, the base station apparatus 3 sets the non-connected cell to the TA group to which the notified connected cell belongs. In this case, the base station apparatus 3 can prevent unnecessary random access procedures from being executed and TA commands from being transmitted to non-connected cells.

  When the measurement report generation unit 4051 determines that there are a plurality of connected cells whose reception timing difference is within a predetermined time, the measurement report generation unit 4051 generates information indicating the connection cell having the smallest reception timing difference and transmits the information to the base station apparatus 3. Like that. As a result, when the mobile station apparatus 5 applies the difference in downlink reception timing between cells to the difference in uplink transmission timing, there is a possibility that intersymbol interference occurs due to uplink synchronization shift due to the influence of measurement error. Can be reduced.

  The measurement report generation unit 4051 generates information indicating the TA group to which the connected cell whose reception timing difference is within the predetermined time belongs as information indicating the connection cell whose reception timing difference is within the predetermined time, and the base station apparatus 3 may be transmitted.

  When the measurement report generator 4051 determines that the reception timing difference is within a predetermined time with respect to the PCell (first type cell) with respect to the reception timing difference in the non-connected cell, only the RSRP of the non-connected cell is obtained. The information regarding the difference in reception timing is not explicitly transmitted to the base station apparatus 3 and is transmitted to the base station apparatus 3, and the difference in reception timing is greater than or equal to a predetermined time with respect to the PCell regarding the difference in reception timing in the unconnected cell. , If it is determined that the difference in the reception timing is within a predetermined time with respect to the SCell (second type cell), the cell index of the SCell (the second type cell in which the difference in reception timing is within the predetermined time) Information) and RSRP of a non-connected cell may be transmitted to the base station apparatus 3. With this configuration, the mobile station device 5 can implicitly indicate to the base station device 3 that the difference in reception timing between the non-connected cell and the PCell is within a predetermined time. Recognizing that the difference in the reception timing of the non-connected cell to which the mobile station apparatus 5 has transmitted RSRP is within a predetermined time with respect to the PCell from the situation that the information regarding the difference is not detected, the non-connected cell is referred to as PCell. The same TA group can be set, and unnecessary random access procedures can be avoided for non-connected cells. Therefore, uplink resources can be used efficiently.

  The connection cell used for the measurement of the difference in reception timing may be limited (restricted) to a cell (Timing reference cell) used as a reference for uplink transmission timing of each cell in each TA group. For example, a cell used as a reference for uplink transmission timing is a cell in which a random access procedure is executed. First, the mobile station apparatus 5 measures the reception timing of the cell and estimates the start timing of the downlink frame. Next, the mobile station apparatus 5 determines that the timing at which the timing offset (deviation) according to the type of the frame structure used for the uplink is set as the start timing of the downlink frame is the start timing of the uplink frame. Temporarily judge. In other words, the mobile station apparatus 5 determines the transmission timing used for transmission of the PRACH preamble. Note that 0 seconds is used for the timing offset depending on the type of the frame structure used for the uplink. Next, the mobile station apparatus 5 transmits a random access preamble from the head timing of the uplink frame that has been provisionally determined. Next, the mobile station device 5 officially determines the head timing of the uplink frame by shifting the time of the head timing of the uplink frame temporarily determined using the transmission timing adjustment value received from the base station device 3. To do. In other words, the mobile station apparatus 5 determines the transmission timing used for transmission of PUSCH, PUCCH, SRS, and DM RS.

  In this way, information on the start timing of the downlink frame is retained for the connected cell in which the random access procedure is executed, and this information is used to detect the difference in downlink reception timing between the connected cell and the non-connected cell. Therefore, it is not necessary to measure downlink reception timing and hold information for the random access procedure in a connected cell in which the random access procedure is not executed. Therefore, detecting a difference in downlink reception timing with a non-connected cell only for a connected cell limited to a cell used as a reference for uplink transmission timing of each cell in each TA group Compared to the case of detecting a difference in downlink reception timing between a connected cell and a non-connected cell with respect to a connected cell, the processing load relating to measurement of the reception timing of the mobile station device 5, information retention, etc. is reduced. Can do.

  Even when the uplink transmission timing is set using the difference in downlink reception timing between cells as the difference in uplink transmission timing, the connected cell used for the measurement of the difference in reception timing is included in the TA group. By limiting to one cell, the processing load of the mobile station apparatus 5 is reduced compared to the case of detecting the difference in downlink reception timing between connected cells and non-connected cells for all connected cells. be able to. When the mobile station apparatus 5 determines and uses a difference in uplink transmission timing from a difference in downlink reception timing between cells, the cell used as a reference for uplink transmission timing (cell whose transmission timing has been adjusted) Based on the difference in uplink transmission timing determined from the difference in downlink reception timing between cells (cells whose transmission timing has been adjusted and cells whose transmission timing has not been adjusted) The adjusted timing is used as the head timing of the uplink frame of the cell (cell without transmission timing adjustment), that is, the uplink transmission timing. In this case, basically, the PCell is the only cell used as a reference for uplink transmission timing.

  When a TA group is configured by a plurality of SCells, a cell having the best downlink reception quality (RSRP) in the TA group may be used for detection of a difference in reception timing from a non-connected cell. Since a cell with good downlink reception quality may have a smaller measurement error of downlink reception timing than a cell with poor downlink reception quality, the most downlink reception within the TA group is possible. Using cells with good quality (RSRP) to detect reception timing differences with non-connected cells compared to using other cells in TA group to detect reception timing differences with non-connected cells The possibility that the measurement accuracy of the difference in the reception timing between the connected cell and the non-connected cell is poor can be reduced.

  In the above description, it should be considered that the process “reception” appropriately includes the same meaning as the process “detection”. In the above description, it should be considered that the meaning of the process “received” may mean that the received information is detected by performing demodulation and decoding of the received signal. In addition, the detection of information that is not related, for example, information related to another mobile station device 5 and is not related to the mobile station device 5 is appropriately included in the meaning of the process “received” in the above description. It should be taken into account.

  As parameters related to transmission power, parameters specific to cells and mobile station apparatuses are notified from the base station apparatus 3 using the PDSCH, and transmission power control commands are notified from the base station apparatus 3 using the PDCCH. . The transmission power control command for PUSCH is included in the uplink grant, and the transmission power control command for PUCCH is included in the downlink assignment. Note that the control unit 405 controls the signal configuration of the PUCCH according to the type of UCI transmitted.

  The radio resource control unit 403 stores and holds the control information generated by the radio resource control unit 103 of the base station device 3 and notified from the base station device 3, and receives the reception processing unit 401 via the control unit 405. The transmission processing unit 407 is controlled. That is, the radio resource control unit 403 has a memory function for holding various parameters.

  The transmission processing unit 407 transmits information data and a signal obtained by encoding and modulating UCI to the base station apparatus 3 via the transmission antenna 411 using PUSCH and PUCCH resources in accordance with instructions from the control unit 405. Also, the transmission processing unit 407 transmits the Dedicated preamble to the base station apparatus 3 using the PRACH resource according to the instruction of the control unit 405. Also, the transmission processing unit 407 transmits the SRS according to the instruction from the control unit 405. Further, the transmission processing unit 407 sets the transmission power of PUSCH, PUCCH, and SRS according to the instruction of the control unit 405. In addition, the transmission processing unit 407 controls signal transmission timing in accordance with an instruction from the control unit 405. Details of the transmission processing unit 407 will be described later.

<Reception Processing Unit 401 of Mobile Station Device 5>
Hereinafter, details of the reception processing unit 401 of the mobile station apparatus 5 will be described. FIG. 5 is a schematic block diagram showing the configuration of the reception processing unit 401 of the mobile station apparatus 5 according to the embodiment of the present invention. As shown in this figure, the reception processing unit 401 includes a reception RF unit 501, an A / D unit 503, a symbol timing detection unit 505, a GI removal unit 507, an FFT unit 509, a demultiplexing unit 511, a propagation path estimation unit 513, PDSCH propagation path compensation section 515, physical downlink shared channel decoding section 517, PDCCH propagation path compensation section 519, physical downlink control channel decoding section 521, and downlink reception quality measurement section 531 are configured. . Further, as shown in this figure, the physical downlink shared channel decoding unit 517 includes a data demodulation unit 523 and a turbo decoding unit 525. Also, as shown in this figure, the physical downlink control channel decoding unit 521 includes a QPSK demodulation unit 527 and a Viterbi decoder unit 529. In the embodiment of the present invention, the case where the reception processing unit 401 has one reception antenna 409 is shown, but a plurality of reception antennas may be configured.

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

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

  The demultiplexing unit 511 separates the signal demodulated by the FFT unit 509 into a PDCCH signal and a PDSCH signal based on the control signal input from the control unit 405. The demultiplexing unit 511 outputs the separated PDSCH signal to the PDSCH propagation path compensation unit 515 and outputs the separated PDCCH signal to the PDCCH propagation path compensation unit 519. Also, the demultiplexing unit 511 demultiplexes the downlink resource element in which the downlink pilot channel is arranged, and transmits the downlink reference signal of the downlink pilot channel to the propagation path estimation unit 513 and the downlink reception quality measurement unit 531. Output. The demultiplexing unit 511 outputs the PDCCH CC signal to the PDCC channel compensation unit 519, and outputs the PDSCH CC signal to the PDSCH channel compensation unit 515.

  The propagation path estimation unit 513 estimates the propagation path variation using the downlink reference signal of the downlink pilot channel separated by the demultiplexing unit 511 and the known signal, and compensates for the propagation path variation. And a channel compensation value for adjusting the phase are output to the channel compensation unit 515 for PDSCH and the channel compensation unit 519 for PDCCH. PDSCH propagation path compensation section 515 adjusts the amplitude and phase of the PDSCH signal separated by demultiplexing section 511 according to the propagation path compensation value input from propagation path estimation section 513. PDSCH propagation path compensation section 515 outputs the signal whose propagation path has been adjusted to data demodulation section 523 of physical downlink shared channel decoding section 517.

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

  PDCCH propagation path compensation section 519 adjusts the amplitude and phase of the PDCCH signal separated by demultiplexing section 511 according to the propagation path compensation value input from propagation path estimation section 513. PDCCH propagation path compensation section 519 outputs the adjusted signal to QPSK demodulation section 527 of physical downlink control channel decoding section 521.

  The physical downlink control channel decoding unit 521 demodulates and decodes the signal input from the PDCCH channel compensation unit 519 as described below, and detects control data. The QPSK demodulator 527 performs QPSK demodulation on the PDCCH signal and outputs the result to the Viterbi decoder 529. The Viterbi decoder unit 529 decodes the signal demodulated by the QPSK demodulator 527 and outputs the decoded DCI to the controller 405. Here, this signal is expressed in bit units, and the Viterbi decoder unit 529 also performs rate dematching in order to adjust the number of bits for which Viterbi decoding processing is performed on the input bits.

  The mobile station apparatus 5 performs processing for detecting DCI addressed to itself for the PDCCH, assuming a plurality of coding rates. The mobile station apparatus 5 performs a different decoding process on the PDCCH signal for each assumed coding rate, and acquires DCI included in the PDCCH in which no error was detected in the CRC code added to the PDCCH together with the DCI. To do. Such a process is called blind decoding. Note that the mobile station apparatus 5 may perform blind decoding only on signals of some resources instead of performing blind decoding on signals of all resources of the DL CC. An area of a part of the resource in which coding is performed blindly is referred to as “Search space”. Further, the mobile station apparatus 5 may perform blind decoding on different resources for each coding rate.

  The control unit 405 determines whether the DCI input from the Viterbi decoder unit 529 is error-free and is addressed to the own device. If the control unit 405 determines that the DCI is addressed to the device without error, the demultiplexing unit is based on the DCI. 511, a data demodulating unit 523, a turbo decoding unit 525, and a transmission processing unit 407 are controlled. For example, when the DCI is a downlink assignment that does not include information regarding the dedicated preamble, the control unit 405 controls the reception processing unit 401 to decode the PDSCH signal using the DL CC to which the resource is allocated. Note that the CRC code is also included in the PDCCH as in the PDSCH, and the control unit 405 determines whether or not the DCI of the PDCCH is incorrect using the CRC code. For example, when the DCI is a downlink assignment including information related to the Dedicated preamble, the control unit 405 controls the transmission processing unit 407 to transmit a PRACH signal using the assigned preamble sequence.

  The downlink reception quality measurement unit 531 measures the downlink reception quality using the downlink reference signal of the downlink pilot channel, and outputs the measured downlink reception quality information to the control unit 405. The downlink reception quality measurement unit 531 measures the downlink reception quality of the connected cell or the non-connected cell. For example, the downlink reception quality measurement unit 531 measures the downlink reception quality related to RSRP and CQI in the connected cell. For example, the downlink reception quality measurement unit 531 measures downlink reception quality related to RSRP in a non-connected cell.

  Although not shown, the reception processing unit 401 performs processing for detecting downlink reception timing, and outputs information related to the reception timing of the connected cell and information related to the reception timing of the non-connected cell to the control unit 405. For example, the information related to the reception timing includes information related to the start timing of the downlink radio frame, information related to the start timing of the downlink subframe, information related to the detection timing of the SCH, and the like.

<Transmission Processing Unit 407 of Mobile Station Device 5>
FIG. 6 is a schematic block diagram showing the configuration of the transmission processing unit 407 of the mobile station apparatus 5 according to the embodiment of the present invention. As shown in this figure, the transmission processing unit 407 includes a plurality of uplink component carrier transmission processing units 601-1 to 601-M (hereinafter referred to as uplink component carrier transmission processing units 601-1 to 601-M). And a component carrier combining unit 603, a D / A unit 605, a transmission RF unit 607, and a transmission antenna 411. Further, as shown in this figure, the uplink component carrier transmission processing section 601 includes a turbo coding section 611, a data modulation section 613, a DFT section 615, an uplink pilot channel processing section 617, and a physical uplink control channel processing section 619. , Subcarrier mapping section 621, IFFT section 623, GI insertion section 625, transmission power adjustment section 627, and random access channel processing section 629. The mobile station apparatus 5 includes a transmission processing unit 601 for each uplink component carrier for the corresponding number of UL CCs. Since each uplink component carrier transmission processing section 601 has the same configuration and function, one of them will be described as a representative.

  The uplink component carrier transmission processing unit 601 generates a signal to be transmitted on the PRACH in the UL CC using the preamble sequence instructed by the control unit 405, and adjusts the transmission power of the PRACH. Also, the transmission processing unit 601 for each uplink component carrier encodes and modulates information data and UCI, generates a signal to be transmitted using PUSCH and PUCCH in the UL CC, and transmits transmission power of PUSCH and PUCCH. Adjust. Also, the transmission processing unit 601 for each uplink component frequency band generates SRS and DM RS to be transmitted using the uplink pilot channel. The turbo coding unit 611 performs turbo coding for increasing the error tolerance of the data at the coding rate instructed by the control unit 405 and outputs the input information data to the data modulation unit 613. The data modulation unit 613 modulates the code data encoded by the turbo coding unit 611 using a modulation method instructed by the control unit 405, for example, a modulation method such as QPSK, 16QAM, or 64QAM, and converts the signal sequence of modulation symbols. Generate. Data modulation section 613 outputs the generated modulation symbol signal sequence to DFT section 615. The DFT unit 615 performs discrete Fourier transform on the signal output from the data modulation unit 613 and outputs the result to the subcarrier mapping unit 621.

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

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

  Uplink pilot channel processing section 617 generates SRS and DM RS, which are known signals in base station apparatus 3, based on instructions from control section 405, and outputs them to subcarrier mapping section 621.

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

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

  The random access channel processing unit 629 generates a signal to be transmitted on the PRACH in the UL CC using the preamble sequence instructed from the control unit 405, and outputs the generated signal to the transmission power adjustment unit 627. The transmission power adjustment unit 627 adjusts the transmission power based on the control signal from the control unit 405 with respect to the signal input from the GI insertion unit 625 or the signal input from the random access channel processing unit 629, and increases the component carrier The data is output to the combining unit 603. Note that the transmission power adjustment unit 627 controls the average transmission power of PRACH, PUSCH, PUCCH, SRS, and DM RS for each uplink subframe. For example, the transmission power adjustment section 627 adjusts the transmission power of the PRACH so that the transmission power increases every time the preamble sequence is retransmitted.

  The component carrier combining unit 603 combines the signals for each UL CC input from each uplink component carrier transmission processing unit 601 and outputs the combined signals to the D / A unit 605. The D / A unit 605 converts the baseband digital signal input from the component carrier combining unit 603 into an analog signal and outputs the analog signal to the transmission RF unit 607. The transmission RF unit 607 generates an in-phase component and a quadrature component of the intermediate frequency from the analog signal input from the D / A unit 605, and removes an extra frequency component for the intermediate frequency band. Next, the transmission RF unit 607 converts (up-converts) the intermediate frequency signal into a high frequency signal, removes excess frequency components, amplifies the power, and transmits to the base station apparatus 3 via the transmission antenna 411. Send. In the transmission processing unit 407, the transmission timing of the signal is controlled by the control unit 405.

<Adjustment of uplink transmission timing>
The uplink transmission timing adjustment value is configured (represented) in either the first format (structure, type, type) or the second format (structure, type, type). The first format has a larger number of bits than the second format and has a wide adjustable range of uplink transmission timing. For example, the first format is composed of 11 bits, and the second format is composed of 6 bits. Let Ts be the minimum time unit used for adjustment of uplink transmission timing. For example, 1 / (15000 × 2048) seconds is used as Ts. For example, in the first format, the uplink transmission timing can be adjusted in the range of 0 × Ts to 1282 × Ts. For example, in the second format, the uplink transmission timing can be adjusted in the range of (−31) × Ts to 32 × Ts.

  A first format is used for information indicating an adjustment value of uplink transmission timing indicated together with information indicating Random ID. Information indicating the transmission timing adjustment value of the first format is used for a response to transmission / reception of a preamble sequence (at the time of initial setting of a cell). A second format is used for information indicating an uplink transmission timing adjustment value indicated together with information indicating C-RNTI. When the mobile station apparatus 5 is instructed to adjust the transmission timing (fine adjustment) based on the SRS received by the base station apparatus 3 instead of the response to the transmission / reception of the preamble sequence (uplink transmission timing after cell initialization) The information indicating the adjustment value of the transmission timing of the second format is used for (fine adjustment and readjustment). In other words, for the uplink of a certain cell, when the uplink transmission timing is initially set, the first format is used for the adjustment value of the uplink transmission timing, and the uplink transmission timing is initially set. When the uplink transmission timing is finely adjusted, the second format is used for the adjustment value of the uplink transmission timing.

  First, the uplink transmission timing is provisionally determined based on the downlink reception timing. Thereafter, the uplink transmission timing is formally determined based on the information indicating the adjustment value of the uplink transmission timing using the first format. Thereafter, the uplink transmission timing is updated (finely adjusted or readjusted) based on the information indicating the adjustment value of the uplink transmission timing using the second format. For example, the adjustment value of the uplink transmission timing using the first format is calculated (generated) by the base station apparatus 3 based on the preamble detection (reception) timing. For example, the uplink transmission timing adjustment value using the first format is calculated by the mobile station apparatus 5 based on the difference in downlink reception timing between cells. For example, the adjustment value of the uplink transmission timing using the second format is calculated by the base station apparatus 3 based on the SRS reception timing (detection timing).

  The uplink transmission timing adjustment processing using the first format is performed by the base station apparatus 3 with respect to the reference transmission timing based on the timing of the downlink time frame detected from the downlink synchronization channel. This is done by applying timing adjustment values. For example, the mobile station apparatus 5 uses a timing earlier than the reference transmission timing by [(adjustment value) × 16 × Ts] as the new transmission timing. The uplink transmission timing adjustment process using the second format with respect to the uplink transmission timing adjustment value is performed by adjusting the transmission timing indicated by the base station apparatus 3 with respect to the already set transmission timing. This is done by applying a value. For example, the mobile station apparatus 5 uses a timing obtained by adjusting [(adjustment value) × 16 × Ts] with respect to the already set transmission timing as a new transmission timing.

  FIG. 7 is a flowchart showing an example of processing for generating information related to the difference in reception timing between the connected cell and the non-connected cell of the measurement report generating unit 4051 of the mobile station apparatus 5 according to the embodiment of the present invention. When determining that the base station apparatus 3 is notified of the RSRP of the non-connected cell, the mobile station apparatus 5 measures the difference in downlink reception timing between the non-connected cell and the connected cell (step S101). Next, the mobile station apparatus 5 determines whether or not the measured difference in reception timing is equal to or longer than a predetermined time (step S102). If the mobile station apparatus 5 determines that the measured difference in reception timing is greater than or equal to the predetermined time (step S102: YES), the mobile station apparatus 5 generates information indicating that the difference in reception timing is greater than or equal to the predetermined time (step S103). . If the mobile station apparatus 5 determines that the difference in the measured reception timing is not greater than or equal to the predetermined time (step S102: NO), the mobile station apparatus 5 determines whether or not there are a plurality of connected cells whose reception timing difference is within the predetermined time. (Step S104). When the mobile station apparatus 5 determines that there are a plurality of connected cells whose reception timing difference is within the predetermined time (step S104: YES), the mobile station apparatus 5 generates information indicating the connection cell with the smallest reception timing difference (step S105). ). When the mobile station apparatus 5 determines that there are not a plurality of connected cells whose reception timing difference is within the predetermined time (step S104: NO), the mobile station device 5 generates information indicating the connected cell whose reception timing difference is within the predetermined time. (Step S106). The mobile station device 5 generates the generated TA assistance information (information indicating that the difference in reception timing is greater than or equal to a predetermined time, information indicating a connected cell in which the difference in reception timing is within the predetermined time) and the measured non-connected cell The information indicating the RSRP is transmitted to the base station apparatus 3.

  FIG. 8 is a diagram illustrating a configuration example of a connection cell according to the embodiment of the present invention. In this figure, the mobile station apparatus 5 has four connected cells (connected cell 1, connected cell 2, connected cell 3, connected cell 4) configured by cell aggregation. The cell index of the connected cell 1 is 1 (ServCellIndex 1), the cell index of the connected cell 2 is 2 (ServCellIndex 2), the cell index of the connected cell 3 is 3 (ServCellIndex 3), and the cell index of the connected cell 4 is 4 ( ServCellIndex 4). In this figure, two TA groups (TA group 1, TA group 2) are configured, and the connection cell 1 and the connection cell 2 belong to the TA group 1, and the connection cell 3 and the connection cell 4 belong to the TA group 2. In other words, the TA group 1 is configured by the connection cell 1 and the connection cell 2, and the TA group 2 is configured by the connection cell 3 and the connection cell 4.

  In this situation, when the mobile station apparatus 5 determines to transmit the RSRP of the non-connected cell (non-connected cell 1) to the base station apparatus 3, the mobile station apparatus 5 determines the difference in downlink reception timing between each connected cell and the non-connected cell 1. taking measurement. The mobile station apparatus 5 receives not only the RSRP of the non-connected cell (non-connected cell 1) to the base station apparatus 3, but also the downlink reception with each connected cell when measuring the non-connected cell 1. Each timing difference may be measured. When the mobile station apparatus 5 determines that the difference in reception timing is greater than or equal to a predetermined time for all connected cells, the mobile station apparatus 5 generates information indicating that the difference in reception timing is greater than or equal to a predetermined time. When the mobile station apparatus 5 determines that the difference in reception timing with respect to the connected cell 1 is within a predetermined time, the mobile station apparatus 5 generates information indicating the cell index (ServCellIndex 1) of the connected cell 1. When the mobile station apparatus 5 determines that the difference in reception timing with respect to the connected cell 2 is within a predetermined time, the mobile station apparatus 5 generates information indicating the cell index (ServCellIndex 2) of the connected cell 2. When the mobile station apparatus 5 determines that the difference in reception timing with respect to the connected cell 3 is within a predetermined time, the mobile station apparatus 5 generates information indicating the cell index (ServCellIndex 3) of the connected cell 3. When the mobile station device 5 determines that the difference in reception timing with respect to the connected cell 4 is within a predetermined time, the mobile station device 5 generates information indicating the cell index (ServCellIndex 4) of the connected cell 4.

  Further, when the mobile station device 5 determines that the difference in reception timing with respect to the connected cell 1 or the connected cell 2 is within a predetermined time, the mobile station device 5 may generate information indicating the TA group1. When the mobile station apparatus 5 determines that the difference in reception timing with respect to the connected cell 3 or the connected cell 4 is within a predetermined time, the mobile station apparatus 5 may generate information indicating the TA group 2.

  Further, the mobile station apparatus 5 may measure the difference in reception timing with respect to the non-connected cell 1 only for one connected cell within each TA group. For example, the mobile station apparatus 5 may measure only the difference in reception timing between the connected cell 1 and the non-connected cell 1 with respect to the TA group 1. For example, the mobile station apparatus 5 may measure only the difference in reception timing between the connected cell 2 and the non-connected cell 1 with respect to the TA group 1. For example, the mobile station device 5 may measure only the difference in reception timing between the connected cell 3 and the non-connected cell 1 with respect to the TA group 2. For example, the mobile station apparatus 5 may measure only the difference in reception timing between the connected cell 4 and the non-connected cell 1 with respect to the TA group 2.

  In addition, the mobile station apparatus 5 may measure a difference in reception timing with respect to the non-connected cell 1 only for a connected cell that is a cell used as a reference for uplink transmission timing. For example, a random access procedure is performed for the connected cell 1 in the TA group 1 and used as a reference for uplink transmission timing, and a random access procedure is performed for the connected cell 4 in the TA group 2 and a reference for uplink transmission timing is used. , The mobile station apparatus 5 measures the reception timing difference between the non-connected cell 1 only for the connected cell 1 and the connected cell 4, and does not measure for the connected cell 2 and the connected cell 3. The difference in reception timing with the connected cell 1 may not be measured.

  Further, when the mobile station apparatus 5 determines that the difference in reception timing with respect to the non-connection cell 1 is within a predetermined time in both the connection cell 1 and the connection cell 3, the mobile station apparatus 5 selects the connection cell with the smallest difference in reception timing. Send information to indicate. For example, if it is determined that the difference in reception timing between the connected cell 1 and the non-connected cell 1 is smaller than the difference in reception timing between the connected cell 3 and the non-connected cell 1, the mobile station device 5 Information indicating a cell index of 1 (ServCellIndex 1) is generated. For example, if it is determined that the difference in reception timing between the connected cell 3 and the non-connected cell 1 is smaller than the difference in reception timing between the connected cell 1 and the non-connected cell 1, the mobile station device 5 Information indicating a cell index of 3 (ServCellIndex 3) is generated. Such a situation is that the downlink reception timing of the unconnected cell 1 is between the downlink reception timing of the connection cell 1 and the downlink reception timing of the connection cell 3, for example, the downlink of the connection cell 1 This occurs when the timing near the middle between the link reception timing and the downlink reception timing of the connected cell 3 is the downlink reception timing of the non-connected cell 1.

  As described above, in the embodiment of the present invention, the mobile station apparatus 5 measures the difference in reception timing between the reception signal of the non-connected cell and the reception signal of the connection cell, and the difference in reception timing is equal to or greater than a predetermined time. Based on the determination, information indicating that the difference in reception timing is equal to or greater than a predetermined time, or information indicating a connected cell whose reception timing difference is within the predetermined time, and non-connection By transmitting information indicating the reception quality (RSRP) of the cell to the base station apparatus 3, the base station apparatus 3 is based on the information (TA assistance information) notified from the mobile station apparatus 5, and the RSRP notified. The TA group can be efficiently set when the connection cell is set as the connection cell. When the base station apparatus 3 is notified of information indicating that the difference in reception timing is equal to or longer than a predetermined time, the base station apparatus 3 sets the non-connected cell to an independent TA group and notifies the TA command independently. Can do. When the random access procedure is used to adjust the transmission timing of cells other than the PCell, the mobile station apparatus 5 can be instructed to execute the random access procedure in the non-connected cell set in the independent TA group. When the base station apparatus 3 is notified of information indicating a connected cell whose reception timing difference is within a predetermined time, the base station apparatus 3 can set the non-connected cell to the TA group to which the notified connected cell belongs. In this case, the base station apparatus 3 can prevent unnecessary random access procedures from being executed and TA commands from being transmitted to non-connected cells.

  If the mobile station apparatus 5 determines that there are a plurality of connected cells whose reception timing differences are within a predetermined time, the mobile station apparatus 5 generates information indicating the connected cells with the smallest reception timing difference and transmits the information to the base station apparatus 3. By doing so, it is possible to reduce the possibility of intersymbol interference due to uplink synchronization shift due to the influence of the measurement error of the downlink reception timing.

  Further, the mobile station apparatus 5 generates information indicating the TA group to which the connected cell to which the difference in reception timing is within the predetermined time belongs as information indicating the connected cell in which the difference in reception timing is within the predetermined time. You may make it transmit to the apparatus 3. FIG.

  In addition, when the mobile station device 5 determines that the difference in reception timing with respect to the PCell (first type cell) is within a predetermined time with respect to the difference in reception timing in the non-connected cell, only the RSRP of the non-connected cell Is transmitted to the base station apparatus 3 and information regarding the difference in reception timing is not explicitly transmitted to the base station apparatus 3, and the reception timing difference with respect to the PCell is greater than or equal to a predetermined time with respect to the reception timing difference in the unconnected cell. Yes, if it is determined that the difference in reception timing is within a predetermined time with respect to the SCell (second type cell), the cell index of the SCell (second type cell) in which the difference in reception timing is within the predetermined time ) And the RSRP of the non-connected cell to the base station device 3, the mobile station device 5 is connected between the non-connected cell and the PCell. The information that the difference in transmission timing is within a predetermined time can be implicitly shown to the base station apparatus 3, and the base station apparatus 3 detects that the information regarding the difference in reception timing has not been detected. Recognizing that the difference in reception timing of the non-connected cell that has transmitted RSRP with respect to the PCell is within a predetermined time, the non-connected cell can be set to the same TA group as the PCell, Thus, unnecessary random access procedures can be avoided. Therefore, uplink resources can be used efficiently.

  In addition, the connection cell used for the measurement of the difference in reception timing may be configured to be limited to one cell in the TA group. For example, the configuration may be limited to a cell used as a reference for uplink transmission timing of each cell in the TA group. More specifically, a cell used as a reference for uplink transmission timing is a cell in which a random access procedure is executed. Thereby, the processing load of the mobile station apparatus 5 can be reduced.

  Further, in the embodiment of the present invention, the case where the mobile station apparatus 5 uses the information regarding the difference in downlink reception timing between the connected cell and the non-connected cell as the TA assistance information has been described. The information regarding the difference in the uplink transmission timing with a connection cell may be used as TA assistance information. The mobile station device 5 measures the difference in downlink reception timing between the connected cell and the non-connected cell, calculates the difference in uplink transmission timing between the connected cell and the non-connected cell based on the measurement result, and calculates Based on the result, information regarding the difference in uplink transmission timing between the connected cell and the non-connected cell may be generated, and the generated information (TA assistance information) may be transmitted to the base station apparatus 3.

  The embodiment described above is merely an example, and can be realized using various modifications, alternatives, and substitutions. For example, the present invention is applicable to both FDD (frequency division duplex) and TDD (time division duplex) communication systems. Moreover, although the example in the communication system to which LTE (EUTRA) and LTE-A (Advanced EUTRA) are applied was described in the above-described embodiment, the mobile station apparatus, base station apparatus, communication system, and communication according to the present invention are described. The method and the integrated circuit can be applied to any communication system that supports a plurality of different uplink transmissions. In addition, the names of the parameters used in the description in the present embodiment are referred to for convenience of description, and the present application claims even if the actually applied parameter name is different from the parameter name of the present application. Obviously, it does not affect the spirit of the invention.

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

  In the embodiment of the present invention, a case has been described in which RSRP is mainly used as downlink reception quality, but other parameters (indicators) may be used. For example, as a parameter (index) indicating downlink reception quality, RSRQ (Reference Signal Received Quality), RSSI (Received Signal Strength Indicator), RSCP (Received Signal Code Power), or the like may be used.

  In the embodiment of the present invention, the difference in reception timing measured by the mobile station apparatus 5 is measured from the reception signal of the non-connected cell and the reception signal of the connection cell, but is received from the reception signal between the connection cells. The timing difference may be measured. The mobile station apparatus 5 determines whether or not the difference in reception timing is greater than or equal to a predetermined time, and based on the determination, information indicating that the difference in reception timing is greater than or equal to the predetermined time, or the difference in reception timing is The base station apparatus 3 is notified from the mobile station apparatus 5 by transmitting to the base station apparatus 3 any of the information indicating the connected cell within the predetermined time and the information indicating the reception quality (RSRP) of the connected cell. Based on the information (TA assistance information), it is possible to efficiently set the TA group of the connected cell to which the RSRP has been notified. For example, when the base station apparatus 3 determines that the reception timing of the connected cell notified of the RSRP is a predetermined time or more from the current TA group based on the information notified from the mobile station apparatus 5, A new TA group is set for the group.

  Or the mobile station apparatus 5 may measure the difference of the reception timing of the received signal between TA groups. The base station device 3 sets the TA group based on the difference in the reception timing of the received signal between the TA groups notified from the mobile station device 5. For example, when the base station apparatus 3 determines that the difference in reception timing of the received signal between the TA groups notified from the mobile station apparatus 5 is not equal to or greater than a predetermined time, each connected cell belonging to the TA group is connected to one TA group. Reset TA group to belong to

  The characteristic means of the present invention described above can also be realized by mounting and controlling functions in an integrated circuit. That is, the integrated circuit of the present invention is an integrated circuit that allows the mobile station apparatus to perform a plurality of functions by being mounted on the mobile station apparatus, and the cell is a connected cell used for data channel transmission / reception, Alternatively, it comprises a non-connected cell that is not used for data channel transmission / reception, a function of communicating with a base station apparatus using the connected cell having a plurality of different frequencies, and a downlink reception quality of the non-connected cell is measured. A function, a function of measuring a reception timing difference between the reception signal of the non-connected cell that measures the reception quality and a reception signal of the connection cell, and whether or not the difference in the reception timing is equal to or greater than a predetermined time. Information indicating that the difference in reception timing is equal to or greater than a predetermined time based on the determination, or the difference in reception timing is within a predetermined time With any of the information indicating the connected cell, a function of transmitting the information indicating the reception quality to the base station apparatus, a series of functions including, characterized in that to exhibit to the mobile station apparatus.

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

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

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

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

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

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

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

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

3 Base station device 4 (A to C) Repeater 5 (A to C) Mobile station device 101 Reception processing unit 103 Radio resource control unit 105 Control unit 107 Transmission processing unit 109 Reception antenna 111 Transmission antenna 201 Physical downlink shared channel processing unit 203 Physical downlink control channel processing unit 205 Downlink pilot channel processing unit 207 Multiplexing unit 209 IFFT unit 211 GI insertion unit 213 D / A unit 215 Transmission RF unit 219 Turbo coding unit 221 Data modulation unit 223 Convolution coding unit 225 QPSK modulation unit 301 Reception RF unit 303 A / D unit 305 Component carrier separation unit 307 Uplink component carrier reception processing unit 309 Symbol timing detection unit 311 GI removal unit 313 FFT unit 315 Subcarrier demapping unit 317 Channel estimation Part 319 channel equalization unit (for PUSCH)
321 Channel equalization unit (for PUCCH)
323 IDFT unit 325 Data demodulation unit 327 Turbo decoding unit 329 Physical uplink control channel detection unit 331 Preamble detection unit 333 SRS processing unit 401 reception processing unit 403 radio resource control unit 405 control unit 407 transmission processing unit 409 reception antenna 411 transmission antenna 501 Reception RF unit 503 A / D unit 505 Symbol timing detection unit 507 GI removal unit 509 FFT unit 511 Demultiplexing unit 513 Channel estimation unit 515 Channel compensation unit (for PDSCH)
517 Physical downlink shared channel decoding unit 519 Propagation channel compensation unit (for PDCCH)
521 Physical downlink control channel decoding unit 523 Data demodulation unit 525 Turbo decoding unit 527 QPSK demodulation unit 529 Viterbi decoder unit 531 Downlink reception quality measurement unit 601 Uplink component carrier transmission processing unit 603 Component carrier combining unit 605 D / A unit 607 Transmission RF unit 611 Turbo coding unit 613 Data modulation unit 615 DFT unit 617 Uplink pilot channel processing unit 619 Physical uplink control channel processing unit 621 Subcarrier mapping unit 623 IFFT unit 625 GI insertion unit 627 Transmission power adjustment unit 629 Random access Channel processor 4051 Measurement report generator

Claims (9)

The cell is a connected cell used for transmission / reception of a data channel or a non-connection cell not used for transmission / reception of a data channel, and a mobile station communicates with a base station apparatus using the connection cell having a plurality of different frequencies. A device,
Measure the downlink reception quality of the unconnected cell,
Measure the reception timing difference between the reception signal of the non-connected cell that measures the reception quality and the reception signal of the connection cell;
Determining whether the difference in reception timing is equal to or greater than a predetermined time;
Based on the determination, either information indicating that the difference in reception timing is equal to or greater than a predetermined time or information indicating the connected cell where the difference in reception timing is within a predetermined time, and information indicating the reception quality Is transmitted to the base station apparatus.   2. The movement according to claim 1, wherein when it is determined that there are a plurality of the connected cells having a difference in the reception timing within a predetermined time, information indicating the connected cell having the smallest difference in the reception timing is transmitted. Station equipment.   The information indicating the connected cell in which the difference in reception timing is within a predetermined time is information indicating a group of transmission timings to which the connected cell in which the difference in reception timing is within a predetermined time belongs. Item 4. The mobile station apparatus according to Item 1. The connection cell is composed of a first type cell or a second type cell,
When it is determined that the difference in reception timing is within a predetermined time for the first type cell, only the information indicating the reception quality is transmitted,
When it is determined that the difference in reception timing with respect to the first type cell is equal to or greater than a predetermined time and the difference in reception timing with respect to the second type cell is within a predetermined time, the reception The mobile station apparatus according to claim 1, wherein information indicating the second type of cell whose timing difference is within a predetermined time and information indicating the reception quality are transmitted.   The mobile station apparatus according to claim 1, wherein the connected cell used for measuring the difference in reception timing is a cell used as a reference for uplink transmission timing. The cell is composed of a connected cell used for data channel transmission / reception or a non-connected cell not used for data channel transmission / reception, and a base station that communicates with a mobile station apparatus using the connection cells having different frequencies. A device,
The difference in reception timing between the information indicating the downlink reception quality of the non-connected cell and the reception signal of the non-connection cell in which the reception quality is measured and the reception signal of the connection cell is greater than or equal to a predetermined time. Receiving from the mobile station apparatus timing related information configured by either information indicating or information indicating the connected cell within a predetermined time,
A base station apparatus configured to set a transmission timing group based on the timing related information when the non-connected cell is configured as the connected cell. A plurality of mobile station apparatuses and a base station apparatus that communicates with the plurality of mobile station apparatuses, and the cell is a connected cell used for data channel transmission / reception or a non-connected cell not used for data channel transmission / reception A communication system in which the base station apparatus and the mobile station apparatus communicate with each other using the connection cells having different frequencies.
The mobile station device
Measure the downlink reception quality of the unconnected cell,
Measure the reception timing difference between the reception signal of the non-connected cell that measures the reception quality and the reception signal of the connection cell;
Determining whether the difference in reception timing is equal to or greater than a predetermined time;
Based on the determination, either information indicating that the difference in reception timing is equal to or greater than a predetermined time or information indicating the connected cell where the difference in reception timing is within a predetermined time, and information indicating the reception quality To the base station device,
The base station device
The difference in reception timing between the information indicating the downlink reception quality of the non-connected cell and the reception signal of the non-connection cell in which the reception quality is measured and the reception signal of the connection cell is greater than or equal to a predetermined time. Receiving from the mobile station apparatus timing related information configured by either information indicating or information indicating the connected cell within a predetermined time,
A communication system, wherein a group of transmission timing is set based on the timing related information when the non-connected cell is configured as the connected cell. The cell is a connected cell used for transmission / reception of a data channel or a non-connection cell not used for transmission / reception of a data channel, and a mobile station communicates with a base station apparatus using the connection cell having a plurality of different frequencies. A communication method used in an apparatus,
Measuring downlink reception quality of the unconnected cell;
Measuring a reception timing difference between the reception signal of the non-connected cell that measures the reception quality and the reception signal of the connection cell;
Determining whether the difference in reception timing is equal to or greater than a predetermined time;
Based on the determination, either information indicating that the difference in reception timing is equal to or greater than a predetermined time or information indicating the connected cell where the difference in reception timing is within a predetermined time, and information indicating the reception quality Transmitting to the base station apparatus at least. An integrated circuit that, when mounted on a mobile station device, causes the mobile station device to perform a plurality of functions,
The cell is composed of a connected cell used for data channel transmission / reception or a non-connected cell not used for data channel transmission / reception, and a function of communicating with a base station apparatus using the connection cells having different frequencies. ,
A function of measuring downlink reception quality of the unconnected cell;
A function of measuring a reception timing difference between the reception signal of the non-connected cell that measures the reception quality and the reception signal of the connection cell;
A function of determining whether the difference in reception timing is equal to or greater than a predetermined time;
Based on the determination, either information indicating that the difference in reception timing is equal to or greater than a predetermined time or information indicating the connected cell where the difference in reception timing is within a predetermined time, and information indicating the reception quality An integrated circuit characterized by causing the mobile station apparatus to exhibit a series of functions including a function of transmitting a message to the base station apparatus.