Mobile station apparatus, communication method, integrated circuit, radio communication system, and control program

In a radio communication system including a plurality of mobile station apparatuses and a base station apparatus, a physical uplink reference signal and a physical uplink control channel signal are efficiently controlled and the mobile station apparatus appropriately transmits a signal. The mobile station apparatus includes: a radio resource control unit 403 that sets a radio resource of a reference signal for measuring channel quality and a radio resource of a physical uplink control channel; a simultaneous transmission control unit 4051 which, when transmitting the physical uplink control channel signal in a time frame in which the radio resource of the reference signal has been set, controls a signal transmission processing depending on whether each radio resource has been set to the same component frequency band or each radio resource has been set to a different component frequency band; and a transmission processing unit 407 that transmits the reference signal and/or the physical uplink control channel signal based on the control of the simultaneous transmission control unit.

TECHNICAL FIELD

The present invention relates to, mobile station apparatuses, communication methods, integrated circuits, radio communication systems, and control programs capable of efficiently controlling a physical uplink reference signal and a physical uplink control channel signal in a radio communication system including a plurality of mobile station apparatuses and abase station apparatus, in which the mobile station apparatus can appropriately transmit the signals.

BACKGROUND ART

In the 3GPP (3rd Generation Partnership Project), the standard of EUTRA (Evolved Universal Terrestrial Radio Access; hereinafter referred to as “EUTRA”) is already established, and a study on a radio access scheme (Advanced EUTRA; hereinafter referred to as “A-EUTRA”), which is an evolved EUTRA, is being started.

In E-UTRA, for example, a sounding reference signal (SRS) is already specified in order for a base station apparatus to measure an uplink channel quality. A mobile station apparatus transmits the sounding reference signal through the use of a radio resource that is set in advance by the base station apparatus. To the mobile station apparatus, a radio resource for periodically transmitting the sounding reference signal is allocated or a radio resource for transmitting the sounding reference signal only once is allocated. The sounding reference signal is transmitted only in a periodic subframe (referred to as an SRS subframe) of a physical uplink that is set in advance by a base station apparatus. Moreover, the sounding reference signal is transmitted using the last SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbol of an uplink subframe.

In E-UTRA, for example, a physical uplink control channel (PUCCH) is already specified in order for a mobile station apparatus to transmit a scheduling request. The scheduling request means that a mobile station apparatus requires a radio resource allocation of a physical uplink shared channel (PUSCH), of a base station apparatus. When making the scheduling request, a mobile station apparatus transmits a physical uplink control channel signal through the use of a periodic radio resource that is set in advance by a base station apparatus. When not making the scheduling request, a mobile station apparatus does not transmit a signal for the scheduling request even if a radio resource has been allocated.

In E-UTRA, there are two types of formats of the physical uplink control channel signal which are used for transmitting a scheduling request (hereinafter, referred to as a first format and a second format). The first format is a format, in which a radio resource in a time domain to which a sounding reference signal may be allocated, i.e., an SC-FDMA symbol to which a sounding reference signal may be allocated, is used for transmission of a scheduling request, while the second format is a format, in which a radio resource in a time domain to which a sounding reference signal may be allocated, i.e., an SC-FDMA symbol to which a sounding reference signal may be allocated, is not used for transmission of a scheduling request.

<Simultaneous Generation of EUTRA SRS and PUCCH>

In E-UTRA, a mode in which a mobile station apparatus can simultaneously transmit a sounding reference signal and a physical uplink control channel signal, and a mode in which a mobile station apparatus cannot transmit a sounding reference signal when the mobile station apparatus transmits a physical uplink control channel signal, are switched and used by a base station apparatus. When a sounding reference signal and a physical uplink control channel signal are simultaneously transmitted in the same subframe, the second format is used as the format for the physical uplink control channel signal.

More specifically, in the sounding reference signal subframe, control information indicating whether, as the format for the physical uplink control channel signal, the first format is used or the second format is used is broadcasted from a base station apparatus to mobile station apparatuses. When in a sounding reference signal subframe, the control information indicating that the first format is used as the format of a physical uplink control channel signal is provided by a base station apparatus, a mobile station apparatus transmits a physical uplink control channel signal by using the first format in the sounding reference signal subframe, and furthermore, when a physical uplink control channel signal is transmitted in the sounding reference signal subframe to which the radio resource for the sounding reference signal has been allocated, the mobile station apparatus transmits only a physical uplink control channel signal without transmitting the sounding reference signal.

When in a sounding reference signal subframe, the control information indicating that the second format is used as the format of a physical uplink control channel signal is provided by a base station apparatus, a mobile station apparatus transmits a physical uplink control channel signal using the second format in the sounding reference signal subframe, and furthermore, when a physical uplink control channel signal transmitted in the sounding reference signal subframe to which the radio resource for the sounding reference signal has been allocated, the mobile station apparatus simultaneously transmits the sounding reference signal and the physical uplink control channel signal.

In contrast, in A-EUTRA, supporting a frequency band wider than in EUTRA and securing the compatibility with EUTRA are being examined. Therefore, in A-EUTRA, a technique (may be referred to as also spectrum aggregation or carrier aggregation) is being examined, in which a base station apparatus carries out communications using a system bandwidth composed of a plurality of component frequency bands, with the frequency band of EUTRA as one unit (one component frequency band) (it should be noted that, the component frequency band may be referred to as also a carrier component or a component carrier (see non-Patent Document 1). In this technique, a base station apparatus carries out communications with an EUTRA-compliant mobile station apparatus by using either one component frequency band in an uplink and in a downlink, respectively, and carries out communications with an A-EUTRA-compliant mobile station apparatus by using one or more component frequency bands in an uplink and in a downlink, respectively.

PRIOR ART DOCUMENTS

Non Patent Document

DISCLOSURE OF THE INVENTION

Problems to be Solved by the Invention

Also in A-EUTRA using a plurality of component frequency bands, a mobile station apparatus needs to efficiently control the transmission processing of a sounding reference signal and a physical uplink control channel signal. However, with regard to the control of the transmission processing of signals of a mobile station apparatus when a sounding reference signal and a physical uplink control channel signal are simultaneously generated in different component frequency bands, no document refers to this point as far as the inventor knows at present. In order to improve the efficiency of the scheduling, adaptive modulation, and transmit power control using the uplink channel quality in a base station apparatus, it is preferable that the mobile station apparatus can transmit the sounding reference signal as much as possible. In contrast, in order to keep the delay required by a mobile station apparatus to complete the transmission of data, small, it is preferable that the mobile station apparatus can reliably transmit the physical uplink control channel signal including a scheduling request.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mobile station apparatus, a communication method, an integrated circuit, a radio communication system, and a control program capable of efficiently controlling a physical uplink reference signal and a physical uplink control channel signal in a radio communication system including a plurality of mobile station apparatuses and a base station apparatus, in which the mobile station apparatus can appropriately transmit the signals.

Means for Solving the Problems

(1) In order to achieve the above-described objective, an embodiment of the present invention employs the following configuration. That is, a mobile station apparatus of the present invention is the mobile station apparatus transmitting a signal by using one or more component frequency bands which are applied to a radio communication system including a plurality of mobile station apparatuses and a base station apparatus transmitting/receiving a signal to/from the plurality of mobile station apparatuses and each of which has a predetermined frequency bandwidth, and the mobile station apparatus includes: a radio resource control unit that sets a radio resource of a reference signal for measuring channel quality and a radio resource of a physical uplink control channel; a simultaneous transmission control unit which, when transmitting a signal of the physical uplink control channel in a time frame in which the radio resource of the reference signal has been set, controls a signal transmission processing depending on whether each radio resource has been set to the same component frequency band or each radio resource has been set to a different component frequency band; and a transmission processing unit that transmits the reference signal and/or physical uplink control channel signal based on the control of the simultaneous transmission control unit.

In this manner, when transmitting a physical uplink control channel signal in a time frame in which the radio resource of a reference signal has been set, the signal transmission processing is controlled depending on whether each radio resource has been set to a same component frequency band or each radio resource has been set to a different component frequency band, and thus the physical uplink control information and the reference signal can be efficiently transmitted.

(2) Furthermore, in the mobile station apparatus of an embodiment of the present invention, the simultaneous transmission control unit controls the transmission processing in accordance with the format of a physical uplink control channel signal.

In this manner, the transmission processing is controlled in accordance with the format of a physical uplink control channel signal, and thus the transmission processing control suitable for each format can be carried out and the uplink control information and the reference signal can be efficiently transmitted.

(3) Moreover, in the mobile station apparatus of an embodiment of the present invention, the format of a physical uplink control channel signal is either one of a first format, in which a radio resource in a time domain, to which the radio resource of the reference signal may be allocated, is used, and a second format, in which a radio resource in a time domain, to which the radio resource of the reference signal may be allocated, is not used.

In this manner, the format of a physical uplink control channel signal is either one of the first format and the second format, and thus the transmission processing control suitable for each format can be carried out and the uplink control information and the reference signal can be efficiently transmitted.

(4) In addition, in the mobile station apparatus of an embodiment of the present invention, the simultaneous transmission control unit, when the format of a physical uplink control channel signal is the first format and the radio resources of the reference signal and the physical uplink control channel have been set to the same component frequency band by the radio resource control unit, performs control so as to transmit the physical uplink control channel signal without transmitting the reference signal, while when the format of a physical uplink control channel signal is the first format and the radio resources of the reference signal and the physical uplink control channel have been set to a different component frequency band, respectively, by the radio resource control unit, the simultaneous transmission control unit performs control so as to simultaneously transmit the reference signal and the physical uplink control channel signal.

In this manner, in the case where the format of a physical uplink control channel signal is the first format, a mobile station apparatus, when the radio resources of a reference signal and a physical uplink control channel signal have been set to the same uplink component frequency band, performs control so as to transmit only the physical uplink control channel signal without transmitting the reference signal. Therefore, an orthogonal sequence having the same sequence length as that of a physical uplink control channel with respect to a different mobile station apparatus, in which a radio resource in the same frequency domain as this physical uplink control channel is used, is appropriately used, and thus the orthogonalization between the physical uplink control channel signals can be reliably realized. Moreover, when the radio resources of a reference signal and a physical uplink control channel signal have been set to a different uplink component frequency band, respectively, the mobile station apparatus performs control so as to simultaneously transmit the reference signal and the physical uplink control channel signal. Therefore, the base station apparatus can reliably achieve the orthogonalization between the signals of the physical uplink control channels with respect to the different mobile station apparatuses, in which a radio resource in the same frequency domain as this physical uplink control channel is used, and also can measure the uplink channel quality of an uplink component frequency band, in which the reference signal has been transmitted. Hence, a mobile station apparatus can reliably transmit a scheduling request to a base station apparatus and keep the delay required to complete the transmission of data small, while a base station apparatus can improve the efficiency of scheduling, adaptive modulation, and transmit power control by using the measured uplink channel quality.

(5) Furthermore, in the mobile station apparatus of an embodiment of the present invention, the simultaneous transmission control unit, when the format of a physical uplink control channel signal is the second format and the radio resources of a reference signal and a physical uplink control channel have been set to the same component frequency band by the radio resource control unit, performs control so as to simultaneously transmit the reference signal and the physical uplink control channel signal. In contrast, when the format of the physical uplink control channel signal is the second format and the radio resources of the reference signal and the physical uplink control channel have been set to a different component frequency band, respectively, by the radio resource control unit, the simultaneous transmission control unit performs control so as to simultaneously transmit the reference signal and the physical uplink control channel signal.

In this manner, when the format of a physical uplink control channel signal is the second format, the mobile station apparatus, when the radio resources of a reference signal and the physical uplink control channel signal have been set to the same uplink component frequency band, performs control so as to simultaneously transmit the reference signal and the physical uplink control channel signal. Therefore, the mobile station apparatus can reliably achieve the orthogonalization between the signals of the physical uplink control channels with respect to the different mobile station apparatuses, in which a radio resource in the same frequency domain as this physical uplink control channel is used, and also can measure the uplink channel quality of an uplink component frequency band, in which the reference signal has been transmitted. Moreover, when the radio resources of a reference signal and a physical uplink control channel signal have been set to a different uplink component frequency band, respectively, the mobile station apparatus performs control so as to simultaneously transmit the reference signal and the physical uplink control channel signal. Therefore, the mobile station apparatus can reliably achieve the orthogonalization between the signals of the physical uplink control channels with respect to the different mobile station apparatuses, in which a radio resource in the same frequency domain as this physical uplink control channel is used, and also can measure the uplink channel quality of an uplink component frequency band, in which the reference signal has been transmitted. Therefore, the mobile station apparatus can reliably transmit a scheduling request to a base station apparatus and keep the delay required to complete the transmission of data small, while the base station apparatus can improve the efficiency of scheduling, adaptive modulation, and transmit power control by using the measured uplink channel quality.

(6) Moreover, in the mobile station apparatus of an embodiment of the present invention, the simultaneous transmission control unit, when the format of a physical uplink control channel signal is the first format and the radio resources of the reference signal and the physical uplink control channel have been set to a different component frequency band, respectively, by the radio resource control unit, performs control so as to transmit the physical uplink control channel signal without transmitting the reference signal. In contrast, when the format of a physical uplink control channel signal is the second format and the radio resources of the reference signal and the physical uplink control channel have been set to a different component frequency band, respectively, by the radio resource control unit, the simultaneous transmission control unit performs control so as to simultaneously transmit the reference signal and the physical uplink control channel signal.

In this manner, when the format of a physical uplink control channel signal is the first format and the radio resources of the reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, the simultaneous transmission control unit performs control so as to transmit the physical uplink control channel signal without transmitting the reference signal. In contrast, when the format of a physical uplink control channel signal is the second format and the radio resources of the reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, the simultaneous transmission control unit performs control so as to simultaneously transmit the reference signal and the physical uplink control channel signal. Therefore, a physical uplink control channel signal and a reference signal can be appropriately transmitted in consideration of the restrictions on transmit power. A mobile station apparatus with the remaining small transmit power capable of transmission, in which the simultaneous transmission of the signals with different uplink component frequency bands is basically prohibited by a base station apparatus, when the first format is used for the physical uplink control channel signal and the radio resources of the reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, transmits only the physical uplink control channel signal without transmitting the reference signal for the reason of the restriction on the transmit power. In contrast, when the second format is used for the physical uplink control channel signal and the radio resources of the reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, this mobile station apparatus can simultaneously transmit the reference signal and the physical uplink control channel signal in the same uplink subframe without concern for the restrictions on the transmit power. The radio resources of a reference signal and a physical uplink control channel signal of a different uplink component frequency band are set to different SC-FDMA symbols, respectively, and a mobile station apparatus does not essentially simultaneously-transmit the signals with different uplink component frequency bands in the unit of SC-FDMA symbol, and the transmit powers required for the respective reference signal and physical uplink control channel signal are not simultaneously generated. Therefore, a mobile station apparatus with the remaining small transmit power capable of transmission, when the format of a physical uplink control channel signal is the second format, can simultaneously transmit the reference signal and the physical uplink control channel signal, whose radio resources are set to a different uplink component frequency band, respectively, in the same uplink subframe.

(7) Moreover, a communication method of an embodiment of the present invention is the communication method of transmitting a signal by using one or more component frequency bands which are applied to a radio communication system including a plurality of mobile station apparatuses and a base station apparatus transmitting/receiving a signal to/from the plurality of mobile station apparatuses and each of which has a predetermined frequency bandwidth, in which the method includes at least the steps of: setting a radio resource of a reference signal for measuring channel quality and a radio resource of a physical uplink control channel in the mobile station apparatus; controlling a signal transmission processing depending on whether each radio resource has been set to the same component frequency band or each radio resource has been set to a different, when transmitting the physical uplink control channel signal in a time frame in which the radio resource of the reference signal has been set; and transmitting the reference signal and/or physical uplink control channel signal based on the control of the signal transmission processing.

In this manner, the signal transmission processing is controlled depending on whether each radio resource has been set to a same component frequency band or each radio resource has been set to a different, when transmitting the physical uplink control channel signal in a time frame in which the radio resource of the reference signal has been set, and thus, uplink control information and the reference signal can be efficiently transmitted.

(8) Furthermore, an integrated circuit of an embodiment of the present invention is an integrated circuit causing a mobile station apparatus to perform a plurality of functions when being mounted on the mobile station apparatus, the integrated circuit causing the mobile station apparatus to perform a series of functions including the functions of: transmitting a signal to a base station apparatus by using one or more component frequency bands each having a predetermined frequency bandwidth; setting a radio resource of a reference signal for measuring channel quality and a radio resource of a physical uplink control channel; controlling a signal transmission processing depending on whether each radio resource has been set to a same component frequency band or each radio resource has been set to a different, when transmitting the physical uplink control channel signal in a time frame in which the radio resource of the reference signal has been set; and transmitting the reference signal and/or physical uplink control channel signal based on the control of the signal transmission processing.

In this manner, when transmitting a physical uplink control channel signal in a time frame in which the radio resource of the reference signal has been set, the signal transmission processing is controlled depending on whether each radio resource has been set to a same component frequency band or each radio resource has been set to a different component frequency band, and thus, uplink control information and the reference signal can be efficiently transmitted.

(9) In addition, a radio communication system of an embodiment of the present invention is the radio communication system including a plurality of mobile station apparatuses and a base station apparatus transmitting/receiving a signal to/from the plurality of mobile station apparatuses by using one or more component frequency bands each having a predetermined frequency bandwidth, in which the base station apparatus includes a reception processing unit receiving a signal transmitted from the mobile station apparatus, in which the mobile station apparatus includes: a radio resource control unit that sets a radio resource of a reference signal for measuring channel quality and a radio resource of a physical uplink control channel; a simultaneous transmission control unit which, when transmitting the physical uplink control channel signal in a time frame in which the radio resource of the reference signal has been set, controls a signal transmission processing depending on whether each radio resource has been set to a same component frequency band or each radio resource has been set to a different component frequency band; and a transmission processing unit that transmits the reference signal and/or physical uplink control channel signal based on the control of the simultaneous transmission control unit.

In this manner, when transmitting a physical uplink control channel signal in a time frame in which the radio resource of a reference signal has been set, the signal transmission processing is controlled depending on whether each radio resource has been set to a same component frequency band or each radio resource has been set to a different component frequency band, and thus, uplink control information and the reference signal can be efficiently transmitted.

(10) Moreover, a control program of an embodiment of the present invention is the control program of a mobile station apparatus transmitting a signal by using one or more component frequency bands which are applied to a radio communication system including a plurality of mobile station apparatuses and a base station apparatus transmitting/receiving a signal to/from the plurality of mobile station apparatuses and each of which has a predetermined frequency bandwidth, and the control program converts a series of processing into commands so as to enable a computer to read and execute them, the series of processing including processing of: setting a radio resource of a reference signal for measuring channel quality and a radio resource of a physical uplink control channel; controlling a signal transmission processing depending on whether each radio resource has been set to the same component frequency band or each radio resource has been set to a different, when transmitting a signal of the physical uplink control channel in a time frame in which the radio resource of the reference signal has been set; and transmitting the reference signal and/or physical uplink control channel signal based on the control of a signal transmission processing.

In this manner, when transmitting s physical uplink control channel signal in a time frame in which the radio resource of s reference signal has been set, the signal transmission processing is controlled depending on whether each radio resource has been set to a same component frequency band or each radio resource has been set to a different component frequency band, and thus, uplink control information and the reference signal can be efficiently transmitted.

Advantageous Effects of Invention

According to the present invention, the mobile station apparatus can appropriately transmit a physical uplink reference signal and a physical uplink control channel signal even when the radio resources of the physical uplink reference signal and the physical uplink control channel signal have been set in the same uplink subframe. Thus, the mobile station apparatus can reliably transmit the physical uplink control channel signal to a base station apparatus and keep the delay required to complete the transmission of data small, while the base station apparatus can improve the efficiency of scheduling, adaptive modulation, and transmit power control by using the measured uplink channel quality.

BEST MODES FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, by usingFIG. 10toFIG. 13, the entire picture of a radio communication system and the configuration of a radio frame according to the embodiment are described. Next, by usingFIG. 1toFIG. 6, the configuration of the radio communication system according to the embodiment will be described. Next, usingFIG. 7toFIG. 8, the operation processing of the radio communication system according to the embodiment will be described.

<Entire Picture of the Radio Communication System>

FIG. 10is a diagram illustrating the overview of an entire picture of the radio communication system according to the embodiment of the present invention. In a radio communication system1shown byFIG. 10, a base station apparatus3and a plurality of mobile station apparatuses5A,5B, and5C carry out radio communications with each other. Moreover,FIG. 10shows that a downlink that is a communication direction from the base station apparatus3to the mobile station apparatuses5A,5B, and5C includes a downlink pilot channel, a physical downlink control channel (referred to as also a PDCCH), a physical downlink shared channel (referred to as also a PDSCH). Moreover,FIG. 10shows that an uplink that is a communication direction from the mobile station apparatuses5A,5B, and5C to the base station apparatus3includes a physical uplink shared channel (referred to as also a PUSCH), an uplink pilot channel, and a physical uplink control channel (referred to as also a PUCCH). Furthermore, an area the base station apparatus3administrates is referred to as a cell. Hereinafter, in the embodiment, the mobile station apparatuses5A,5B, and5C are referred to as a mobile station apparatus5and will be described.

<Configuration of the Downlink Radio Frame>

FIG. 11is a diagram showing the schematic configuration of the radio frame of a downlink (referred to as a downlink radio frame) from the base station apparatus3to the mobile station apparatus5according to the embodiment of the present invention. InFIG. 11, the horizontal axis represents a frequency domain and the vertical axis represents a time domain. The downlink radio frame is a unit of radio resource allocation or the like, and is composed of a pair of resource blocks (referred to as a downlink resource block pair) including a predetermined frequency band and time slot of a downlink. One downlink resource block pair is composed of two resource blocks contiguous in the time domain of a downlink (referred to as downlink resource blocks).

Moreover, inFIG. 11, one downlink resource block is composed of 12 subcarriers in the frequency domain of a downlink (referred to as downlink subcarriers) and is composed of seven OFDM symbols in the time domain. A system bandwidth of a downlink (referred to as a downlink system bandwidth) is the communication bandwidth of a downlink of the base station apparatus3, and is composed of a plurality of component frequency bandwidths of a downlink (referred to as downlink component frequency bandwidths). In the radio communication system1, the component frequency band of a downlink (referred to as a downlink component frequency band) is the bandwidth of a predetermined frequency bandwidth, and the downlink component frequency bandwidth is the frequency bandwidth of a downlink component frequency band. For example, the system bandwidth of a downlink (referred to as a downlink system bandwidth) with a bandwidth of 40 MHz is composed of two downlink component frequency bands with a bandwidth of 20 MHz.

It should be noted that, in a downlink component frequency band, a plurality of downlink resource blocks is arranged in accordance with the downlink component frequency bandwidth. For example, a downlink component frequency band with a bandwidth of 20 MHz is composed of 100 downlink resource blocks. Moreover, for example, the downlink component frequency bandwidth is the frequency bandwidth the EUTRA-compliant mobile station apparatus5can use for communications, and the downlink system bandwidth is the frequency bandwidth the A-EUTRA-compliant mobile station apparatus5can use for communications.

Furthermore, in the time domain shown byFIG. 11, there are a slot (referred to as a downlink slot) composed of seven OFDM symbols, a subframe (referred to as a downlink subframe) composed of two downlink slots, and a downlink radio frame composed of ten downlink subframes. It should be noted that a unit composed of one downlink subcarrier and one OFDM symbol is referred to as a resource element (a downlink resource element). In each downlink subframe, at least a physical downlink shared channel used for transmission of information data and a physical downlink control channel used for transmission of control data are arranged. InFIG. 11, the physical downlink control channel is composed of the first to third OFDM symbols of a downlink subframe, and the physical downlink shared channel is composed of the fourth to fourteenth OFDM symbols of a downlink subframe.

Although illustration is omitted inFIG. 11, a reference signal of a downlink pilot channel (referred to as a downlink reference signal) used in estimation of the channel variation in a physical downlink shared channel and in a physical downlink control channel is distributed and arranged in a plurality of downlink resource elements. Here, the downlink reference signal is a known signal, which is used for a downlink pilot channel, in the radio communication system1.

It should be noted that one physical downlink shared channel is composed of one or more downlink resource blocks within the same downlink component frequency band, and one physical downlink control channel is composed of a plurality of downlink resource elements within the same downlink component frequency band. Within a downlink system bandwidth, a plurality of physical downlink shared channels and a plurality of physical downlink control channels are arranged. The base station apparatus3can arrange one physical downlink control channel and one physical downlink shared channel within the same downlink component frequency band in the same downlink subframe with respect to one EUTRA-compliant mobile station apparatus5, and can arrange a plurality of physical downlink control channels and a plurality of physical downlink shared channels in the same downlink subframe with respect to one A-EUTRA-compliant mobile station apparatus5. It should be noted that the base station apparatus3can arrange a plurality of physical downlink control channels within the same downlink component frequency band in the same downlink subframe, with respect to one A-EUTRA-compliant mobile station apparatus5. However, the base station apparatus3cannot arrange a plurality of physical downlink shared channels within the same downlink component frequency band, but can arrange each physical downlink shared channel in a different downlink component frequency band.

In the physical downlink control channel, a signal generated from control data, such as a mobile station identifier, information about radio resource allocation of a physical downlink shared channel, information about radio resource allocation of a physical uplink shared channel, multi-antenna related information, a modulation scheme, a coding rate, and a retransmission parameter, is arranged. It should be noted that one physical downlink control channel includes only the information about radio resource allocation of one physical downlink shared channel or the information about radio resource allocation of one physical uplink shared channel, and does not include the information about radio resource allocation of a plurality of physical downlink shared channels or the information about radio resource allocation of a plurality of physical uplink shared channels.

<Configuration of the Uplink Radio Frame>

FIG. 12is a diagram showing the schematic configuration of a radio frame of an uplink (referred to as an uplink radio frame) from the mobile station apparatus5to the base station apparatus3according to the embodiment of the present invention. InFIG. 12, the horizontal axis represents a frequency domain and the vertical axis represents a time domain. The uplink radio frame is a unit of radio resource allocation or the like, and is composed of a pair of resource blocks (referred to as an uplink resource block pair) including a predetermined frequency band and time width of an uplink. One uplink resource block pair is composed of two resource blocks contiguous in the time domain of an uplink (referred to as uplink resource blocks).

Moreover, inFIG. 12, one uplink resource block is composed of 12 subcarriers in the frequency domain of an uplink (referred to as uplink subcarriers) and is composed of seven SC-FDMA symbols in the time domain. A system bandwidth of an uplink (referred to as an uplink system bandwidth) is the communication bandwidth width of an uplink of the base station apparatus3, and is composed of a plurality of component frequency bandwidths of an uplink (referred to as uplink component frequency bandwidths). In the radio communication system1, the component frequency band of an uplink (referred to as an uplink component frequency band) is the bandwidth of a predetermined frequency bandwidth, and the uplink component frequency bandwidth is the frequency bandwidth of an uplink component frequency band. For example, a system bandwidth of an uplink (referred to as an uplink system bandwidth) with a bandwidth of 40 MHz is composed of two uplink component frequency bands with a bandwidth of 20 MHz.

It should be noted that, in an uplink component frequency band, a plurality of uplink resource blocks is arranged in accordance with an uplink component frequency bandwidth. For example, an uplink component frequency band with a bandwidth of 20 MHz is composed of 100 uplink resource blocks. Furthermore, for example, the uplink component frequency bandwidth is the frequency bandwidth the EUTRA-compliant mobile station apparatus5can use for communications, and the uplink system bandwidth is the frequency bandwidth the A-EUTRA-compliant mobile station apparatus5can use for communications.

Moreover, in the time domain shown byFIG. 12, there are a slot (referred to as an uplink slot) composed of g seven SC-FDMA symbols, a subframe (referred to as an uplink subframe) composed of two uplink slots, and an uplink radio frame composed of ten uplink subframes. It should be noted that 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).

In each uplink subframe, at least a physical uplink shared channel used for transmission of information data and a physical uplink control channel used for transmission of control data are arranged. The physical uplink control channel is used to transmit the control data including a scheduling request, and a channel quality indicator with respect to a downlink or a reception confirmation response with respect to a physical downlink shared channel. The present invention is directed to the physical uplink control channel used to transmit a scheduling request.

There are two types of formats (hereinafter, referred to as a first format and a second format) of a physical uplink control channel signal that are used to transmit a scheduling request. As shown inFIG. 12, the first format is a format, in which a radio resource in the time domain to which a sounding reference signal may be allocated, i.e., an SC-FDMA symbol to which a sounding reference signal may be allocated, is used, while the second format is a format, in which a radio resource in the time domain to which a sounding reference signal may be allocated, i.e., an SC-FDMA symbol to which a sounding reference signal may be allocated, is not used.

For the first format, the first to the seventh SC-FDMA symbols of the first uplink slot and the first to the seventh SC-FDMA symbols of the second uplink slot of the uplink subframe are used. For the second format, the first to the seventh SC-FDMA symbols of the first uplink slot and the first to the sixth SC-FDMA symbols of the second uplink slot of the uplink subframe are used. For the first format, the seventh SC-FDMA symbol of the second uplink slot of the uplink subframe is used, while for the second format, the seventh SC-FDMA symbol of the second uplink slot of the uplink subframe is not used. For the physical uplink control channel used to transmit a scheduling request, an orthogonal sequence is multiplied to an SC-FDMA symbol in a unit of uplink slot in the time domain.

FIG. 13is a table showing orthogonal sequences multiplied to a physical uplink control channel that is used to transmit a scheduling request in the embodiment of the present invention. Two types of orthogonal sequences each having a different sequence length are used, and three orthogonal sequences are used for each sequence length. With respect to a physical uplink control channel of the first format, any of the orthogonal sequences of the sequence length4in the first uplink slot and the second uplink slot of the uplink subframe is used, and each symbol of this sequence is multiplied to the first, the second, the sixth, and the seventh SC-FDMA symbols of each uplink slot.

For the physical uplink control channel of the second format, any of the orthogonal sequences of the sequence length4in the first uplink slot of the uplink subframe is used, and each symbol of the orthogonal sequence is multiplied to the first, the second, the sixth, and the seventh SC-FDMA symbols of the first uplink slot, and any of the orthogonal sequences of the sequence length3in the second uplink slot of the uplink subframe is used, and each symbol of the orthogonal sequence is multiplied to the first, the second, and the sixth SC-FDMA symbols of the second uplink slot. A plurality of physical uplink control channels is arranged in the same uplink resource block, and each physical uplink control channel arranged in the same uplink resource block is orthogonally multiplexed by the orthogonal sequence. Furthermore, in order to achieve suitable orthogonal multiplexing, an orthogonal sequence of the same sequence length is used for at least a physical uplink control channel arranged in the same uplink resource block.

It should be noted that one physical uplink shared channel is composed of one or more uplink resource blocks within the same uplink component frequency band, and one physical uplink control channel is composed of two uplink resource blocks having a symmetric relation with respect to the frequency domain within the same uplink component frequency band, the two uplink resource blocks each being located in a different uplink slot. For example, inFIG. 12, within an uplink subframe within an uplink component frequency band having the lowest frequency, one uplink resource block pair used in a physical uplink control channel is composed of an uplink resource block with the lowest frequency of the first uplink slot and an uplink resource block with the highest frequency of the second uplink slot.

A plurality of physical uplink shared channels and a plurality of physical uplink control channels are arranged within an uplink system bandwidth. The base station apparatus3can allocate one radio resource of a physical uplink control channel and one radio resource of a physical uplink shared channel, respectively, within the same uplink component frequency band in the same uplink subframe, with respect to one EUTRA-compliant mobile station apparatus5. Furthermore, the base station apparatus3can allocate one radio resource of one physical uplink shared channel for each uplink component frequency band in the same uplink subframe, with respect to one A-EUTRA-compliant mobile station apparatus5. It should be noted that, the base station apparatus3cannot allocate the radio resources of a plurality of physical uplink shared channels within the same uplink component frequency band in the same uplink subframe, with respect to one A-EUTRA-compliant mobile station apparatus5, but can allocates the radio resource of each physical uplink shared channel to a different uplink component frequency band.

The uplink pilot channel is composed of an uplink pilot channel for demodulation used in estimation of the channel variation in a physical uplink control channel and in a physical uplink shared channel and an uplink pilot channel for reference used in frequency scheduling of a physical uplink shared channel of the base station apparatus3. It should be noted that the uplink pilot channel for reference is used also for measurement of a deviation of synchronization between the base station apparatus3and the mobile station apparatus5.

A reference signal (referred to as an uplink reference signal) is arranged in an SC-FDMA symbol that differs between a case where the uplink pilot channel for demodulation is arranged within the same uplink resource block as a physical uplink shared channel and a case where the uplink pilot channel for demodulation is arranged within the same uplink resource block as a physical uplink control channel. Here, the uplink reference signal is used for an uplink pilot channel and is a known signal in the radio communication system1.

When the uplink pilot channel for demodulation is arranged within the same uplink resource block as a physical uplink shared channel, an uplink reference signal is arranged in the fourth SC-FDMA symbol within an uplink slot (the uplink reference signal of the pilot channel for demodulation is referred to as a DeModulation Reference Signal DM RS). When the uplink pilot channel for demodulation is arranged within the same uplink resource block as a physical uplink control channel including the control data composed of a scheduling request, the demodulation reference signal is arranged in the third, the fourth, and the fifth SC-FDMA symbols within the uplink slot. When the demodulation reference signal is arranged within the same uplink resource block as the physical uplink control channel including the control data composed of reception confirmation response, the demodulation reference signal is arranged in the third, the fourth, and the fifth SC-FDMA symbols within the uplink slot. When arranged within the same uplink resource block as the physical uplink control channel including the control data composed of a channel quality indicator, the demodulation reference signal is arranged in the second and the sixth SC-FDMA symbols within an uplink slot.

The uplink pilot channel for reference is arranged within the uplink resource block the base station apparatus3determined, and an uplink reference signal (the uplink reference signal of the uplink pilot channel for reference is referred to as the Sounding Reference Signal SRS) is arranged in the fourteenth SC-FDMA symbol (the seventh SC-FDMA symbol of the second uplink slot of the uplink subframe) within the uplink subframe. The sounding reference signal is arranged only in the uplink subframe (referred to as the sounding reference subframe: SRS subframe) with a cycle which the base station apparatus3determined within a cell. The base station apparatus3allocates a cycle, at which the sounding reference signal is transmitted for each mobile station apparatus5, and allocates an uplink resource block to the sounding reference signal subframe.

Although this Figure shows a case where a physical uplink control channel is arranged in the uplink resource block at the very end of each uplink component frequency band, an uplink resource block such as the second or the third uplink resource block from the end of an uplink component frequency band, may be used for the physical uplink control channel.

It should be noted that, in the radio communication system1according 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, in which the transmission/reception of a signal is carried out by using the DFT-Spread OFDM scheme in a unit of uplink component frequency band, and is a scheme, in which communications are carried out by using a plurality of processing units related to DFT-Spread OFDM transmission/reception in an uplink subframe of the radio communication system1using a plurality of uplink component frequency bands.

First Embodiment

Overall Configuration of the Base Station Apparatus3

Hereinafter, the configuration of the base station apparatus3according to the embodiment will be described usingFIG. 1andFIG. 2,FIG. 3.FIG. 1is a schematic block diagram showing the configuration of the base station apparatus3according to the embodiment of the present invention. As shown inFIG. 1, the base station apparatus3includes a reception processing unit101, a radio resource control unit103, a control unit105, and a transmission processing unit107.

The reception processing unit101, in accordance with an instruction of the control unit105, demodulates the received signals of a physical uplink control channel and a physical uplink shared channel, which are received from the mobile station apparatus5by means of a receiving antenna109, using the uplink reference signal of the pilot channel for demodulation and decodes the resultant signals to extract control data and information data. Moreover, the reception processing unit101measures the channel quality of one or more uplink resource blocks using the sounding reference signal received from the mobile station apparatus5. The reception processing unit101carries out processing of extracting control data or processing of measuring the channel quality, with respect to an uplink subframe and an uplink resource block, in which the base station apparatus device3allocated the radio resource of a physical uplink control channel or a sounding reference signal to the mobile station apparatus5. The reception processing unit101is instructed from the control unit105about what kind of processing is carried out to which uplink subframe and which uplink resource block. The reception processing unit101outputs the extracted control data and the measured channel quality to the control unit105, and outputs information data to an higher layer. The detail of the reception processing unit101will be described later.

The radio resource control unit103sets a radio resource allocation (a transmission period, an uplink resource block) of a sounding reference signal, the cycle and the transmit power of a sounding reference signal subframe, a radio resource allocation of a physical downlink control channel, a radio resource allocation of a physical uplink control channel, a radio resource allocation of a physical downlink shared channel, a radio resource allocation of a physical uplink shared channel, the modulation schemes and the coding rates of various channels, and the like of the respective mobile station apparatuses5. Moreover, the radio resource control unit103, based on the control data which is obtained using a physical uplink control channel in the reception processing unit101and is input via the control unit105, sets the radio resource allocation and the like for the physical uplink shared channel. For example, the radio resource control unit103, when a scheduling request is input as the control data, allocates the radio resource of a physical uplink shared channel to the mobile station apparatus5that has transmitted the scheduling request. Moreover, the radio resource control unit103determines whether the first format is used or the second format is used for the format of a physical uplink control channel signal of a sounding reference signal subframe of each uplink component frequency band.

The radio resource control unit103sets the radio resource allocation of a physical uplink shared channel, the value of transmit power, and the like based on the channel quality of the uplink input through the control unit105. For example, the radio resource control unit103allocates the radio resource for a physical uplink shared channel to an uplink resource block having a good channel quality with respect to the mobile station apparatus5, or sets the value of transmit power based on the channel quality so that a received signal can achieve a predetermined error rate. Moreover, the radio resource control unit103controls the simultaneous transmission of the signals with different uplink component frequency bands based on the information related to the remaining transmit power capable of transmission, notification of which the mobile station apparatus5provides. When the remaining transmit power capable of transmission is large, the simultaneous transmission of the signals with different uplink component frequency bands is permitted for the mobile station apparatus5, while when the remaining transmit power capable of transmission is small, the simultaneous transmission of the signals with different uplink component frequency bands is prohibited for the mobile station apparatus5.

The radio resource control unit103outputs various control information to the control unit105. The examples of the control information include: control information indicating whether the first format is used or the second format is used for the format of a physical uplink control channel signal in a sounding reference signal subframe, control information indicative of the radio resource allocation of a sounding reference signal, control information indicative of the radio resource allocation of a physical uplink control channel, control information indicative of the cycle of a sounding reference signal subframe, and control information indicating whether the simultaneous transmission of the signals with different uplink component frequency bands is permitted or prohibited.

The control unit105, based on the control information input from the radio resource control unit103, carries out the control of the radio resource allocation, modulation scheme, and coding rate of a physical downlink shared channel and a physical downlink control channel with respect to the transmission processing unit107. Moreover, the control unit105, based on the control information, generates the control data, which is transmitted using a physical downlink control channel, and outputs the same to the transmission processing unit107. Moreover, the control unit105performs control so as to transmit the control information indicative of the radio resource allocation of a sounding reference signal, the control information indicative of the cycle of a sounding reference signal subframe, the control information indicative of the radio resource allocation of a physical uplink control channel, the control information indicating whether the first format is used or the second format is used for the format of the physical uplink control channel signal of the sounding reference signal subframe of each uplink component frequency band, and the like to the mobile station apparatus5via the transmission processing unit107by using a physical downlink shared channel.

The control unit105, based on the control information input from the radio resource control unit103, carries out the control of the radio resource allocation, modulation scheme, and coding rate of a physical uplink shared channel and a physical uplink control channel with respect to the reception processing unit101. Moreover, the control unit105, based on the control information input from the radio resource control unit103, carries out the control of the measurement of channel quality using a sounding reference signal with respect to the reception processing unit101. Moreover, the control unit105outputs the control data, which is transmitted by the mobile station apparatus5using a physical uplink control channel and is input via the reception processing unit101, to the radio resource control unit103.

The transmission processing unit107, based on the control signal input from the control unit105, generates a signal that is to be transmitted using a physical downlink control channel and a physical downlink shared channel, and transmits the same via the transmission antenna111. The transmission processing unit107transmits the control information indicative of the radio resource allocation of a sounding reference signal, the control information being input from the radio resource control unit103, the control information indicative of the cycle of a sounding reference signal subframe, the control information indicative of the radio resource allocation of a physical uplink control channel, the control information indicating whether the first format is used or the second format is used for the format of the physical uplink control channel signal of the sounding reference signal subframe of each uplink component frequency band, and information data input from an higher layer to the mobile station apparatus5by using a physical downlink shared channel, and transmits the control data input from the control unit105to the mobile station apparatus5by using a physical downlink control channel. It should be noted that, for simplicity of description, hereinafter, assume that the information data includes several kinds of control information. The detail of the transmission processing unit107will be described later.

<Configuration of the Transmission Processing Unit107of the Base Station Apparatus3>

Hereinafter, the detail of the transmission processing unit107of the base station apparatus3will be described.FIG. 2is a schematic block diagram showing the configuration of the transmission processing unit107of the base station apparatus3according to the embodiment of the present invention. As shown inFIG. 2, the transmission processing unit107includes a plurality of physical downlink shared channel processing units201-1to201-M (hereinafter, the physical downlink shared channel processing units201-1to201-M are collectively denoted as a physical downlink shared channel processing unit201), a plurality of physical downlink control channel processing units203-1to203-M (hereinafter, the physical downlink control channel processing units203-1to203-M are collectively denoted as a physical downlink control channel processing unit203), a downlink pilot channel processing unit205, a multiplexing unit207, an IFFT (Inverse Fast Fourier transformation) unit209, a GI (Guard Interval) insertion unit211, a D/A (Digital/Analog conversion) unit213, an RF (Radio Frequency) transmission unit215, and transmission antenna111. It should be noted that, each physical downlink shared channel processing unit201and each physical downlink control channel processing unit203have the same configuration and function, respectively, and thus one of them will be described as the representative.

Moreover, as shown inFIG. 2, each physical downlink shared channel processing unit201includes a turbo coding unit219and a data modulation unit221. Moreover, as shown inFIG. 2, the physical downlink control channel processing unit203includes a convolutional coding unit223and a QPSK modulation unit225. The physical downlink shared channel processing unit201carries out a baseband signal processing for transmitting the information data directed to the mobile station apparatus5in the OFDM scheme. The turbo coding unit219carries out a turbo coding of the input information data for improving the error resilience of the data with a coding rate input from the control unit105, and outputs the result to the data modulation unit221. The data modulation unit221modulates the data, which is encoded by the turbo coding unit219, in a modulation scheme input from the control unit105, such as a modulation scheme of QPSK, 16QAM, 64QAM, or the like, and generates a signal sequence of modulation symbols. The data modulation unit221outputs the generated signal sequence to the multiplexing unit207.

The physical downlink control channel processing unit203carries out a baseband signal processing for transmitting the control data, which is input from the control unit105, in the OFDM scheme. A convolutional coding unit223, based on the coding rate input from the control unit105, carries out a convolutional coding for improving the error resilience of control data. Here, the control data is controlled bit-by-bit. Moreover, the convolutional coding unit223, based on the coding rate input from the control unit105, also carries out a rate matching on the convolutionally coded bits in order to adjust the number of output bits. The convolutional coding unit223outputs the coded control data to the QPSK modulation unit225. The QPSK modulation unit225modulates the control data, which the convolutional coding unit223coded, in the QPSK modulation scheme and outputs a signal sequence of the modulated modulation symbols to the multiplexing unit207. The downlink pilot channel processing unit205generates a downlink reference signal (referred to as also a Cell specific RS), which is a known signal in the mobile station apparatus5, and outputs the same to the multiplexing unit207.

The multiplexing unit207multiplexes a signal input from the physical downlink pilot channel processing unit205, a signal input from each physical downlink shared channel processing unit201, and a signal input from each physical downlink control channel processing unit203into a downlink radio frame in accordance with an instruction from the control unit105. The control information related to the radio resource allocation of a physical downlink shared channel and the radio resource allocation of a physical downlink control channel set by the radio resource control unit103is input to the control unit105, and based on this control information, the control unit105controls the processing of the multiplexing unit207.

It should be noted that the multiplexing unit207carries out the multiplexing between a physical downlink shared channel and a physical downlink control channel in a time multiplexing manner as shown inFIG. 11. Moreover, the multiplexing unit207carries out the multiplexing between a downlink pilot channel and other channels in a time/frequency multiplexing manner. Moreover, the multiplexing unit207may carry out the multiplexing of the physical downlink shared channels directed to the respective mobile station apparatuses5in a unit of downlink resource block pair, and may multiplex the physical downlink shared channels with respect to one mobile station apparatus5by using a plurality of downlink resource block pairs. Moreover, the multiplexing unit207carries out the multiplexing of the physical downlink control channels directed to the respective mobile station apparatuses5by using a plurality of downlink resource elements dispersed within the same downlink component frequency band. The multiplexing unit207outputs the multiplexed signal to an IFFT unit209.

The IFFT unit209performs the fast inverse Fourier transformation of the signal which the multiplexing unit207multiplexed, and performs the OFDM modulation, and outputs the result to the GI insertion unit211. The GI insertion unit211generates a baseband digital signal including symbols in the OFDM scheme by adding a guard interval to the signal on which the IFFT unit209performed the OFDM modulation. As is well known, the guard interval is generated by copying the head or a part of the end of a symbol to transmit. The GI insertion unit211outputs the generated baseband digital signal to the D/A unit213. The D/A unit213converts the baseband digital signal input from the GI insertion unit211to an analog signal, and outputs the same to an RF transmission unit215. The RF transmission unit215generates an in-phase component and a quadrature-phase component of an intermediate frequency from the analog signal input from the D/A unit213, and removes the frequency components redundant for the intermediate frequency band. Next, the RF transmission unit215converts (up-converts) the intermediate frequency signal to a high frequency signal, removes the redundant frequency components, amplifies electric power, and transmits the resultant signal to the mobile station apparatus5via the transmission antenna111.

<Configuration of the Reception Processing Unit101of the Base Station Apparatus3>

Hereinafter, the detail of the reception processing unit101of the base station apparatus3will be described.FIG. 3is a schematic block diagram showing the configuration of the reception processing unit101of the base station apparatus3according to the embodiment of the present invention. As shown inFIG. 3, the reception processing unit101includes an RF receiving unit301, an A/D (Analog/Digital conversion) unit303, a component frequency band separating unit305, a plurality of reception processing units for each uplink component frequency band307-1to307-M (hereinafter, the reception processing units for each uplink component frequency band307-1to307-M are denoted as a reception processing unit for each uplink component frequency band307). Moreover, as shown inFIG. 3, the reception processing unit for each uplink component frequency band307includes a symbol timing detection unit309, a GI removing unit311, an FFT unit313, a subcarrier demapping unit315, a channel estimation unit317, a channel equalizing unit319for physical uplink shared channels, a channel equalizing unit321for physical uplink control channels, an IDFT unit323, a data demodulation unit325, a turbo decoding unit327, a physical uplink control channel detection unit329, and an uplink channel quality measuring unit331. It should be noted that each reception processing unit for each uplink component frequency band307has the same configuration and function, and thus one of them will be described as the representative.

The RF receiving unit301appropriately amplifies a signal received by the receiving antenna109, converts (down-converts) this signal to an intermediate frequency, removes unnecessary frequency components, controls the amplification level so that the signal level is appropriately kept, and quadrature-demodulates the received signal based on the in-phase component and quadrature-phase component of the received signal. The RF receiving unit301outputs the quadrature-demodulated analog signal to the A/D unit303. The A/D unit303converts the analog signal, which the RF receiving unit301quadrature-demodulated, to a digital signal and outputs the converted digital signal to the component frequency band separating unit305. The component frequency band separating unit305separates the received signal for each uplink component frequency band of an uplink system bandwidth, and outputs the resultant signal to each reception processing unit for each uplink component frequency band307.

The reception processing unit for each uplink component frequency band307carries out the demodulation and decoding of the physical uplink shared channel and the physical uplink control channel within an uplink component frequency band and detects information data and control data. Moreover, the reception processing unit for each uplink component frequency band307measures the channel quality of the uplink.

The symbol timing detection unit309, based on the signal input from the component frequency band separating unit305, detects the timing of a symbol, and outputs a control signal indicative of the timing of a boundary of the detected symbols to the GI removing unit311. The GI removing unit311, based on the control signal from the symbol timing detection unit309, removes a portion corresponding to the guard interval from the signal input from the component frequency band separating unit305, and outputs the remaining signal portion to the FFT unit313. The FFT unit313performs the fast Fourier transformation of the signal input from the GI removing unit311, performs DFT-Spread OFDM modulation, and outputs the result to the subcarrier demapping unit315. It should be noted that, the number of FFT points of the FFT unit313is equal to the number of IFFT points of an IFFT unit of the mobile station apparatus5to be described later.

The subcarrier demapping unit315, based on the control signal input from the control unit105, separates the signal, which the FFT unit313demodulated, into uplink reference signals (a demodulation reference signal and a sounding reference signal) of the uplink pilot channels (an uplink pilot channel for demodulation and an uplink pilot channel for reference), a physical uplink shared channel signal, and a physical uplink control channel signal. The subcarrier demapping unit315outputs the separated demodulation reference signal to the channel estimation unit317, outputs the separated physical uplink shared channel signal to the channel equalization unit for physical uplink shared channels319, outputs the separated physical uplink control channel signal to the channel equalization unit for physical uplink control channels321, and also outputs the separated sounding reference signal to the uplink channel quality measuring unit331.

The channel estimation unit317estimates the variation in a channel using the demodulation reference signal, which the subcarrier demapping unit315separated, and a known signal. The channel estimation unit317outputs the estimated channel estimation value to the channel equalization unit for physical uplink shared channels319and the channel equalization unit for physical uplink control channels321. The channel equalization unit for physical uplink shared channels319, based on the channel estimation value input from the channel estimation unit317, equalizes the amplitude and the phase of the physical uplink shared channel signal which the subcarrier demapping unit315separated. Here, “equalization” refers to the process of restoring the variation in a channel, which a signal experienced during radio communications. The channel equalization unit for physical uplink shared channels319outputs the adjusted signal to the IDFT unit323.

The IDFT unit323performs the discrete inverse Fourier transformation of the signal input from the channel equalization unit for physical uplink shared channels319, and outputs the result to the data demodulation unit325. The data demodulation unit325demodulates the physical uplink shared channel signal which the IDFT unit323converted, and outputs the demodulated physical uplink shared channel signal to the turbo decoding unit327. This demodulation is the demodulation compliant with a modulation scheme that is used in the data modulation unit of the mobile station apparatus5, and the modulation scheme is input from the control unit105. The turbo decoding unit327decodes information data from the physical uplink shared channel signal that is input from and demodulated by the data demodulation unit325. The coding rate is input from the control unit105.

The channel equalization unit for physical uplink control channels321equalizes the amplitude and the phase of a physical uplink control channel signal that is separated in the subcarrier demapping unit315, based on the channel estimation value input from the channel estimation unit317. The channel equalization unit for physical uplink control channels321outputs the equalized signal to the physical uplink control channel detection unit329. The physical uplink control channel detection unit329, in accordance with the transmitted control data (a scheduling request, a channel quality indicator, a reception confirmation response), demodulates and decodes the signal, which is input from the channel equalization unit for physical uplink control channels321, and detects the control data. The physical uplink control channel detection unit329detects the signal in a radio resource that is allocated to the mobile station apparatus5in order to transmit a scheduling request. For example, the physical uplink control channel detection unit329multiplies an orthogonal sequence to the signal of an uplink resource block, which is allocated to the mobile station apparatus5in order to transmit a scheduling request, to combine a signal, and if the electric power of the combined signal is equal to or greater than a predetermined threshold value, the physical uplink control channel detection unit329determines that a scheduling request signal from the mobile station apparatus5has been detected.

It should be noted that the physical uplink control channel detection unit329makes use of the same orthogonal sequence as the orthogonal sequence multiplied in the mobile station apparatus5. The physical uplink control channel detection unit329, when having detected a scheduling request signal, generates a control signal indicative of having detected the scheduling request, and outputs the same to the control unit105. In contrast, if the electric power of the combined signal is less than a predetermined threshold value, the physical uplink control channel detection unit329determines that a scheduling request signal from the mobile station apparatus5has not been detected. In this case, the physical uplink control channel detection unit329generates a control signal indicative of not having detected a scheduling request, and outputs the same to the control unit105. Moreover, the physical uplink control channel detection unit329performs demodulation and decoding on a signal of an uplink resource block, which is allocated to the mobile station apparatus5in order to transmit a channel quality indicator and a reception confirmation response and is equalized in the channel equalization unit for physical uplink control channels321, and detects the channel quality indicator and the reception confirmation response. The physical uplink control channel detection unit329outputs the detected control data to the control unit105.

The uplink channel quality measuring unit331measures the channel quality by using a sounding reference signal input from the subcarrier demapping unit315, and outputs the measurement result of the channel quality of the uplink resource block to the control unit105. The uplink channel quality measuring unit331is indicated by the control unit105about on a signal of which uplink resource block of which uplink subframe to perform the measurement of the channel quality of the mobile station apparatus5.

The control unit105, based on the control data which the base station apparatus3transmitted using a physical downlink control channel to the mobile station apparatus5and the control information which it transmitted using a physical downlink shared channel, controls the subcarrier demapping unit315, the data demodulation unit325, the turbo decoding unit327, the channel estimation unit317, the physical uplink control channel detection unit329, and the uplink channel quality measuring unit331. Moreover, the control unit105, based on the control data and the control information which the base station apparatus3transmitted to the mobile station apparatus5, knows in which radio resource (uplink resource block), the physical uplink shared channel, the physical uplink control channel, and the sounding reference signal, which each mobile station apparatus5transmitted, are arranged.

<Overall Configuration of the Mobile Station Apparatus5>

Hereinafter, the configuration of the mobile station apparatus5according to the embodiment will be described usingFIG. 4,FIG. 5, andFIG. 6.FIG. 4is a schematic block diagram showing the configuration of the mobile station apparatus5according to the embodiment of the present invention. As shown inFIG. 4, the mobile station apparatus5includes the reception processing unit401, the radio resource control unit403, the control unit405, and the transmission processing unit407. Moreover, the control unit405includes a simultaneous transmission control unit4051.

The reception processing unit401receives a signal from the base station apparatus3, and demodulates and decodes the received signal in accordance with an instruction of the control unit405. The reception processing unit401, when having detected the physical downlink control channel signal addressed to its own apparatus, outputs the control data obtained by decoding the physical downlink control channel signal, to the control unit405. Moreover, the reception processing unit401, in accordance with an instruction of the control unit405after outputting the control data included in a physical downlink control channel to the control unit405, outputs the information data obtained by decoding a physical downlink shared channel addressed to its own apparatus, to an higher layer via the control unit405. Moreover, the reception processing unit401outputs the control information obtained by decoding a physical downlink shared channel, the control information being generated by the radio resource control unit103of the base station apparatus3, to the control unit405, and outputs the same to the radio resource control unit403of the mobile station apparatus5via the control unit405.

The examples of the control information generated by the radio resource control unit103of the base station apparatus3include the control information indicative of the radio resource allocation of a sounding reference signal, the control information indicative of the cycle of a sounding reference signal subframe, the control information indicative of the radio resource allocation of a physical uplink control channel, and the control information indicating whether the first format is used or the second format is used for the format of the physical uplink control channel signal of the sounding reference signal subframe of each uplink component frequency band. Moreover, the reception processing unit401measures the channel quality of a downlink using the downlink reference signal of the downlink pilot channel of each downlink component frequency band, and outputs the measurement result to the control unit405. The detail of the reception processing unit401will be described later.

The control unit405includes the simultaneous transmission control unit4051. The control unit405confirms the data, which has been transmitted using a physical downlink shared channel and input from the reception processing unit401, outputs the information data within the data to an higher layer, and controls the reception processing unit401and the transmission processing unit407based on the control information, which is generated by the radio resource control unit103of the base station apparatus3, within the data. Moreover, similarly, the control unit405, based on the control data that has been transmitted using a physical downlink control channel and input by the reception processing unit401, controls the reception processing unit401and the transmission processing unit407.

The simultaneous transmission control unit4051, when the radio resources of a sounding reference signal and a physical uplink control channel have been set in the same uplink subframe (time frame) by the base station apparatus3, controls the transmission processing of the sounding reference signal and the physical uplink control channel signal according to whether each radio resource is set in the same uplink component frequency band or each radio resource is set in a different uplink component frequency band, and outputs a control signal to the transmission processing unit407. Moreover, the simultaneous transmission control unit4051, in accordance with the format of a physical uplink control channel signal that is used in order to transmit a scheduling request in the sounding reference signal subframe of each uplink component frequency band, controls the transmission processing of the sounding reference signal and the physical uplink control channel signal. The format is composed of a first format, in which a radio resource of the time domain, to which the radio resource of a sounding reference signal may be allocated, is used or a second format, in which the radio resource of the time domain, to which the radio resource of a sounding reference signal may be allocated, is not used.

The simultaneous transmission control unit4051, when the format of the sounding reference signal subframe of a physical uplink control channel signal is the first format and the radio resources of a sounding reference signal and a physical uplink control channel have been simultaneously set to the same uplink component frequency band in the radio resource control unit403, performs control so as to transmit the physical uplink control channel signal without transmitting the sounding reference signal in the transmission processing unit407, and when the format of the sounding reference signal subframe of a physical uplink control channel signal is the first format and the radio resources of a sounding reference signal and a physical uplink control channel have simultaneously been set to a different uplink component frequency band, respectively, in the radio resource control unit403, the simultaneous transmission control unit4051performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal in the transmission processing unit407.

It should be noted that, in the case where the simultaneous transmission of the signals with different uplink component frequency bands is prohibited by the base station apparatus3, the simultaneous transmission control unit4051, even when the radio resources of a sounding reference signal and a physical uplink control channel have simultaneously been set to a different uplink component frequency band, respectively, in the radio resource control unit403, may perform control so as to transmit the physical uplink control channel signal without transmitting the sounding reference signal in the transmission processing unit407. The base station apparatus3controls the simultaneous transmission of the signals with different uplink component frequency bands based on the information related to the remaining transmit power capable of transmission, notification of which the mobile station apparatus5provides, and when the remaining transmit power capable of transmission is large, the simultaneous transmission of the signals with different uplink component frequency bands is permitted, while when the remaining transmit power capable of transmission is small, the simultaneous transmission of the signals with different uplink component frequency bands is prohibited.

The simultaneous transmission control unit4051, when the format of the sounding reference signal subframe of a physical uplink control channel signal is the second format and the radio resources of the sounding reference signal and the physical uplink control channel have simultaneously been set to the same uplink component frequency band in the radio resource control unit403, performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal in the transmission processing unit407. In contrast, when the format of the sounding reference signal subframe of the physical uplink control channel signal is the second format and the radio resources of the sounding reference signal and the physical uplink control channel have simultaneously been set to a different uplink component frequency band, respectively, in the radio resource control unit403, the simultaneous transmission control unit4051performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal in the transmission processing unit407.

It should be noted that, even in the case where the simultaneous transmission of the signals with different uplink component frequency bands is basically prohibited by the base station apparatus3, the simultaneous transmission control unit4051, when the format of a physical uplink control channel signal is the second format and the radio resources of the sounding reference signal and the physical uplink control channel have simultaneously been set to a different uplink component frequency band, respectively, in the radio resource control unit403, performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal in the transmission processing unit407.

Moreover, the simultaneous transmission control unit4051, when the format of the sounding reference signal subframe of a physical uplink control channel signal is the first format and the radio resources of the sounding reference signal and the physical uplink control channel have simultaneously been set to a different uplink component frequency band, respectively, in the radio resource control unit403, performs control so as to transmit the physical uplink control channel signal without transmitting the sounding reference signal in the transmission processing unit407. In contrast, when the format of the sounding reference signal subframe of the physical uplink control channel signal is the second format and the radio resources of the sounding reference signal and the physical uplink control channel have simultaneously been set to a different uplink component frequency band, respectively, in the radio resource control unit403, the simultaneous transmission control unit4051performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal in the transmission processing unit407.

That is, the simultaneous transmission control unit4051, when the simultaneous transmission of the signals with different uplink component frequency bands is basically prohibited by the base station apparatus3, controls the transmission processing of a sounding reference signal and a physical uplink control channel signal in accordance with the format of the physical uplink control channel, and in the case of the first format, the simultaneous transmission control unit4051performs control so as to transmit the physical uplink control channel signal without transmitting the sounding reference signal in the transmission processing unit407, while in the case of the second format, the simultaneous transmission control unit4051performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal in the transmission processing unit407. The control unit405controls the transmission processing unit407so as to transmit a sounding reference signal and a physical uplink control channel signal based on the control of the simultaneous transmission control unit4051.

The radio resource control unit403controls the reception processing unit401and the transmission processing unit407via the control unit405while holding the control information which is generated by the radio resource control unit103of the base station apparatus3and notification of which the base station apparatus3provides. For example, the radio resource control unit403outputs, to the control unit405, the control signal related to a radio resource allocation (a transmission period, an uplink resource block) of a sounding reference signal; the transmit power of a physical uplink shared channel, a physical uplink control channel, and an uplink pilot channel; the radio resource allocation of a physical uplink control channel; and the format used for the physical uplink control channel signal of each uplink component frequency band.

Moreover, the radio resource control unit403determines whether or not to transmit a signal indicative of a scheduling request using a radio resource that is allocated from the base station apparatus3, and when it is determined that the signal indicative of a scheduling request is transmitted, the radio resource control unit403outputs a control signal indicative of that effect to the control unit405, and controls the transmission processing unit407so as to transmit the signal using a physical uplink control channel.

The transmission processing unit407encodes the information data and the control data in accordance with an instruction of the control unit405, and arranges the modulated signal into the radio resources of a physical uplink shared channel and a physical uplink control channel, and transmits the same to the base station apparatus3via the transmission antenna411. Furthermore, the transmission processing unit407transmits a sounding reference signal in accordance with an instruction of the control unit405. The detail of the transmission processing unit407will be described later. It should be noted that, as the radio resource allocation of a physical uplink control channel for transmission of a scheduling request, an uplink resource block of a periodic uplink subframe is allocated to the mobile station apparatus5.

<Reception Processing Unit401of the Mobile Station Apparatus5>

Hereinafter, the detail of the reception processing unit401of the mobile station apparatus5will be described.FIG. 5is a schematic block diagram showing the configuration of the reception processing unit401of the mobile station apparatus5according to the embodiment of the present invention. As shown inFIG. 5, the reception processing unit401includes an RF receiving unit501, an A/D unit503, a symbol timing detection unit505, a GI removing unit507, an FFT unit509, a de-multiplexing unit511, a channel estimation unit513, a downlink channel quality measuring unit515, a channel compensation unit516for physical downlink shared channels, a physical downlink shared channel decoding unit517, a channel compensation unit519for physical downlink control channels, and a physical downlink control channel decoding unit521. Furthermore, as shown inFIG. 5, the physical downlink shared channel decoding unit517includes a data demodulation unit523and a turbo decoding unit525. Moreover, as shown inFIG. 5, the physical downlink control channel decoding unit521includes a QPSK demodulation unit527and a Viterbi decoder unit529.

The RF receiving unit501appropriately amplifies a signal received by the receiving antenna409, converts (down-converts) the same to an intermediate frequency, removes unnecessary frequency components, and controls the amplification level so that the signal level is appropriately maintained, and quadrature-demodulates the received signal based on the in-phase component and quadrature-phase component of the received signal. The RF receiving unit501outputs the quadrature-demodulated analog signal to the A/D unit503.

The A/D unit503converts the analog signal, which the RF receiving unit501quadrature-demodulated, to a digital signal, and outputs the converted digital signal to the symbol timing detection unit505and the GI removing unit507. The symbol timing detection unit505, based on the digital signal which the A/D unit503converted, detects the timing of a symbol and outputs a control signal indicative of the timing of a symbol boundary to the GI removing unit507. The GI removing unit507, based on a control signal from the symbol timing detection unit505, removes a portion corresponding to the guard interval from the digital signal which the A/D unit503output, and outputs the remaining signal portion to the FFT unit509. The FFT unit509performs fast Fourier transformation of the signal input from the GI removing unit507, performs OFDM modulation, and outputs the result to the de-multiplexing unit511.

The de-multiplexing unit511, based on the control signal input from the control unit405, separates a signal which the FFT unit509demodulated, to a physical downlink control channel signal and a physical downlink shared channel signal. The de-multiplexing unit511outputs the separated physical downlink shared channel signal to the channel compensation unit516for physical downlink shared channels, and also outputs the separated physical downlink control channel signal to the channel compensation unit519for physical downlink control channels. Moreover, the de-multiplexing unit511separates a downlink resource element in which a downlink pilot channel is arranged, and outputs a downlink reference signal of the downlink pilot channel to the channel estimation unit513and the downlink channel quality measuring unit515.

The channel estimation unit513outputs a channel compensation value for adjusting the amplitude and the phase to the channel compensation unit516for physical downlink shared channels and the channel compensation unit519for physical downlink control channels so as to estimate a variation in the channel and compensate the same by using the downlink reference signal of the downlink pilot channel, which the de-multiplexing unit511separated, and a known signal. The downlink channel quality measuring unit515measures the channel quality of the downlink using the downlink reference signal of the downlink pilot channel, and outputs the measurement result of the channel quality of the downlink to the control unit405. The channel compensation unit516for physical downlink shared channels adjusts the amplitude and the phase of the physical downlink shared channel signal, which the de-multiplexing unit511separated, in accordance with the channel compensation value input from the channel estimation unit513. The channel compensation unit516for physical downlink shared channels outputs a signal, the channel of which is adjusted, to the data demodulation unit523of the physical downlink shared channel decoding unit517.

The physical downlink shared channel decoding unit517, based on an instruction from the control unit405, carries out the demodulation and decoding of the physical downlink shared channel, and detects information data. The data demodulation unit523demodulates a physical downlink shared channel signal input from the channel compensation unit516, and outputs the demodulated physical downlink shared channel signal to the turbo decoding unit525. This demodulation is the demodulation compliant with the modulation scheme used in the data modulation unit221of the base station apparatus3. The turbo decoding unit525decodes the information data from the physical downlink shared channel signal that is input from the data demodulation unit523and is demodulated, and outputs the information data to an higher layer via the control unit405. It should be noted that, control information that is transmitted using a physical downlink shared channel, the control information being generated by the radio resource control unit103of the base station apparatus3, is also output to the control unit405, and is output also to the radio resource control unit403via the control unit405.

The channel compensation unit519for physical downlink control channels adjusts the amplitude and the phase of the physical downlink control channel signal which the de-multiplexing unit511separated, in accordance with the channel compensation value input from the channel estimation unit513. The channel compensation unit519for physical downlink control channels outputs the adjusted signal to the QPSK demodulation unit527of the physical downlink control channel decoding unit521.

The physical downlink control channel decoding unit521demodulates and decodes a signal input from the channel compensation unit519for physical downlink control channels, and detects the control data, as follows. The QPSK demodulation unit527performs QPSK demodulation on a physical downlink control channel signal, and outputs the result to the Viterbi decoder unit529. The Viterbi decoder unit529decodes the signal which the QPSK demodulation unit527demodulated, and outputs the decoded control data to the control unit405. Here, this signal is expressed bit-by-bit, and the Viterbi decoder unit529also performs a rate de-matching on input bits in order to adjust the number of bits on which the Viterbi decoding is performed.

It should be noted that, the control unit405determines whether or not the control data input from the Viterbi decoder unit529is correct and is the control data addressed to its own apparatus, and when it is determined that this control data is correct and is the control data addressed to its own apparatus, the control unit405controls the de-multiplexing unit511, the data demodulation unit523, the turbo decoding unit525, and the transmission processing unit407based on the control data. For example, the control unit405, when the control data includes information about a radio resource allocation of a physical uplink shared channel, performs control so as to transmit a physical uplink shared channel signal in an uplink component frequency band, to which a radio resource has been allocated, to the transmission processing unit407.

<Transmission Processing Unit407of the Mobile Station Apparatus5>

FIG. 6is a schematic block diagram showing the configuration of the transmission processing unit407of the mobile station apparatus5according to the embodiment of the present invention. As shown inFIG. 6, the transmission processing unit407includes a plurality of transmission processing units for each uplink component frequency band601-1to601-M (hereinafter, the transmission processing units for each uplink component frequency band601-1to601-M are collectively denoted as a transmission processing unit for each uplink component frequency band601), a component frequency band combining unit603, a D/A unit605, an RF transmission unit607, and a transmission antenna411. Moreover, as shown inFIG. 6, the transmission processing unit for each uplink component frequency band601includes a turbo coding unit611, a data modulation unit613, a DFT unit615, an uplink pilot channel processing unit617, a physical uplink control channel processing unit619, a subcarrier mapping unit621, an IFFT unit623, a multiplication unit624, and a GI insertion unit625. The mobile station apparatus5has the number of transmission processing units for each uplink component frequency band601corresponding to the number of uplink component frequency bands. It should be noted that, each transmission processing unit for each uplink component frequency band601has the same configuration and function, and thus one of them will be described as the representative.

The transmission processing unit for each uplink component frequency band601performs the encoding and modulation on information data and control data, and generates a signal to be transmitted using a physical uplink shared channel and a physical uplink control channel within an uplink component frequency band. Moreover, the transmission processing unit for each uplink component frequency band601generates a sounding reference signal and a demodulation reference signal to be transmitted using an uplink pilot channel. The turbo coding unit611carries out a turbo coding for improving the error resilience of data on the input information data with a coding rate indicated by the control unit405, and outputs the resultant data to the data modulation unit613. The data modulation unit613modulates the data that is encoded by the turbo coding unit611, in a modulation scheme indicated by the control unit405, such as a modulation scheme of QPSK, 16QAM, or 64QAM, and generates a signal sequence of modulation symbols. The data modulation unit613outputs the generated signal sequence of modulation symbol to the DFT unit615.

The DFT unit615performs discrete Fourier transformation of the signal which the data modulation unit613output, and outputs the result to the subcarrier mapping part621. The physical uplink control channel processing unit619performs a baseband signal processing for transmitting the control data input from the control unit405. The control data input to the physical uplink control channel processing unit619includes a scheduling request, a channel quality indicator of a downlink, a reception confirmation response, and the like. The physical uplink control channel processing unit619performs a baseband signal processing and outputs the generated signal to the subcarrier mapping unit621.

The uplink pilot channel processing unit617, based on an instruction from the control unit405, generates an uplink reference signal, which is a known signal in the base station apparatus3, as a signal used for a demodulation reference signal and a sounding reference signal, and outputs the same to the subcarrier mapping unit621.

The subcarrier mapping unit621, in accordance with an instructions from the control unit405, arranges a signal input from the uplink pilot channel processing unit617, a signal input from the DFT unit615, and a signal input from the physical uplink control channel processing unit619into a subcarrier, and outputs the same to the IFFT unit623. It should be noted that, the subcarrier mapping unit621arranges a sounding reference signal, a demodulation reference signal within a physical uplink shared channel, and a demodulation reference signal within a physical uplink control channel as shown inFIG. 12, and outputs the arrangement result.

The IFFT unit623performs fast inverse Fourier transformation of a signal the subcarrier mapping unit621output, and outputs the result to the multiplication unit624. Here, the number of IFFT points of the IFFT unit623is larger than the number of DFT points of the DFT unit615. The mobile station apparatus5, by using the DFT unit615, the subcarrier mapping unit621, and the IFFT unit623, performs DFT-Spread OFDM modulation on a signal that is transmitted using a physical uplink shared channel. The multiplication unit624multiplies an orthogonal code in a unit of SC-FDMA symbol in accordance with an instruction from the control unit405, and outputs the result to the GI insertion unit625. Here, the control unit405, with respect to a physical uplink control channel signal including the control data of a scheduling request, controls the multiplication unit624to multiply each orthogonal code of the orthogonal sequence as shown inFIG. 13to a SC-FDMA symbol, while with respect to an physical uplink shared channel signal, a sounding reference signal, or a demodulation reference signal, the control unit405controls the multiplication unit624to output the input signal as is without multiplying anything. The GI insertion unit625adds a guard interval to the signal input from the multiplication unit624, and outputs the result to the component frequency band combining unit603.

The component frequency band combining unit603combines the signal for each uplink component frequency band input from each transmission processing unit for each uplink component frequency band601, and outputs the result to the D/A unit605. The D/A unit605converts a baseband digital signal input from the component frequency band combining unit603to an analog signal, and outputs the analog signal to the RF transmission unit607. The RF transmission unit607generates an in-phase component and a quadrature-phase component of an intermediate frequency from the analog signal input from the D/A unit605, and removes the frequency components redundant for the intermediate frequency band. Next, the RF transmission unit607converts (up-converts) the intermediate frequency signal to a high frequency signal, removes the redundant frequency components, amplifies electric power, and transmits the resultant signal to the base station apparatus3via the transmission antenna411. With the above configuration, the transmission processing unit407transmits a sounding reference signal and a physical uplink control channel signal to the base station apparatus3based on the control of the control unit405.

<Transmission Processing of a Sounding Reference Signal and a Physical Uplink Control Channel Signal>

The transmission processing of a sounding reference signal and a physical uplink control channel signal will be described. A case will be described, where two uplink component frequency bands (a first uplink component frequency band and a second uplink component frequency band) are used.FIG. 7is a diagram showing an example of a combination of radio resources set to a sounding reference signal and a physical uplink control channel signal in the embodiment of the present invention. A case will be described, where a sounding reference signal subframe is set for every two uplink subframes in the first uplink component frequency band and the second uplink component frequency band. Moreover, a case will be described, in which the first uplink component frequency band, the radio resource of a sounding reference signal is allocated for every two sounding reference signal subframes, and in the second uplink component frequency band, the radio resource of a sounding reference signal is allocated for every four sounding reference signal subframes. Moreover, a case will be described, where the radio resource of a physical uplink control channel signal has been allocated to the first uplink component frequency band for every two uplink subframes. Moreover, a case will be described, in which the first uplink component frequency band, the first format is set to the physical uplink control channel of the sounding reference signal subframe up to the uplink subframe #4, and the second format is set to the physical uplink control channel of the sounding reference signal subframe of the uplink subframe #5 and thereafter. It should be noted that the first format is already set to the physical uplink control channel of the uplink subframe that is not the sounding reference signal subframe.

First, a case will be described, where the radio resources of a sounding reference signal and a physical uplink control channel are set only to one of the uplink component frequency bands. A case will be described, where the physical uplink control channel of the first format is set in the sounding reference signal subframe of the first uplink component frequency band. The mobile station apparatus5, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to the same uplink subframe in the first uplink component frequency band (Case #1 ofFIG. 7), transmits only the physical uplink control channel signal without transmitting the sounding reference signal.

A case will be described, where the physical uplink control channel of the second format is set in the sounding reference signal subframe of the first uplink component frequency band. The mobile station apparatus5, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to the same uplink subframe in the first uplink component frequency band (Case #2 ofFIG. 7), simultaneously transmits the sounding reference signal and the physical uplink control channel signal.

Next, a case will be described, where the radio resources of a sounding reference signal and a physical uplink control channel are set to a different uplink component frequency band, respectively. A case will be described, where the physical uplink control channel of the first format is set in the sounding reference signal subframe of the first uplink component frequency band. The mobile station apparatus5, when the radio resource of a sounding reference signal has been set in the same uplink subframe in the second uplink component frequency band, and the radio resource of a physical uplink control channel signal has been set in the first uplink component frequency band (Case #3 ofFIG. 7), simultaneously transmits the sounding reference signal and the physical uplink control channel signal. It should be noted that, the mobile station apparatus5having a remaining small transmit power capable of transmission, based on an instruction from the base station apparatus3, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to the same uplink subframe with a different uplink component frequency band, transmits only the physical uplink control channel signal without transmitting the sounding reference signal.

A case will be described, where the physical uplink control channel of the second format is set in the sounding reference signal subframe of the first uplink component frequency band. The mobile station apparatus5, when the radio resource of a sounding reference signal has been set in the same uplink subframe in the second uplink component frequency band, and the radio resource of a physical uplink control channel signal has been set in the first uplink component frequency band (Case #4 ofFIG. 7), simultaneously transmits the sounding reference signal and the physical uplink control channel signal. It should be noted that, the mobile station apparatus5, regardless of the remaining transmit power capable of transmission, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to the same uplink subframe with a different uplink component frequency band and the format of the physical uplink control channel signal is the second format, simultaneously transmits the sounding reference signal and the physical uplink control channel signal.

It should be noted that, the mobile station apparatus5, when a scheduling request is not transmitted in an uplink subframe to which the radio resource of the physical uplink control channel for transmission of a scheduling request has been allocated, does not use the allocated radio resource. Even when a physical uplink control channel of the first format has been set in the sounding reference signal subframe of the first uplink component frequency band and the radio resource of a sounding reference signal has been set in the same uplink subframe in the second uplink component frequency band and further the radio resource of a physical uplink control channel signal has been set in the first uplink component frequency band (Case #3 ofFIG. 7), the mobile station apparatus5, when it is determined that a scheduling request is not transmitted to the base station apparatus3, transmits only the sounding reference signal.

<Transmission Processing Flow of a Sounding Reference Signal and a Physical Uplink Control Channel Signal>

FIG. 8is a flow chart showing an example of a transmission processing when the radio resources of a sounding reference signal of the mobile station apparatus5and a physical uplink control channel signal have been set to the same uplink subframe, according to the embodiment of the present invention.FIG. 8shows the processing in a unit of uplink subframe. The simultaneous transmission control unit4051determines whether or not a sounding reference signal and a physical uplink control channel signal have been set to a radio resource of the same uplink component frequency band (Step S101). The simultaneous transmission control unit4051, when it is determined that the sounding reference signal and the physical uplink control channel signal have been set to the radio resource of the same uplink component frequency band (Step S101: YES), determines whether or not the format of the physical uplink control channel signal is the first format (Step S102). In contrast, the simultaneous transmission control unit4051, when it is determined that the sounding reference signal and the physical uplink control channel signal have not been set to the radio resource of the same uplink component frequency band, i.e., that the sounding reference signal and the physical uplink control channel signal have been set to the radio resource of a different uplink component frequency band, respectively (Step S101: NO), determines whether or not the simultaneous transmission of the signals with different uplink component frequency bands is possible (Step S103). It should be noted that, the simultaneous transmission control unit4051, based on control information indicating whether the simultaneous transmission of the signals with different uplink component frequency bands, notification of which the base station apparatus3provides, is permitted or prohibited, determines whether or not the simultaneous transmission of the signals with different uplink component frequency bands is possible.

In Step S102, the simultaneous transmission control unit4051, when it is determined that the format of the physical uplink control channel signal is the first format (Step S102: YES), controls the transmission processing unit407so as to transmit only the physical uplink control channel signal without transmitting the sounding reference signal (Step S104). In contrast, in Step S102, the simultaneous transmission control unit4051, when it is determined that the format of the physical uplink control channel signal is not the first format, i.e., that it is the second format (Step S102: NO), controls the transmission processing unit407so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal (Step S105).

In Step S103, the simultaneous transmission control unit4051, when it is determined that the simultaneous transmission of the signals with different uplink component frequency bands is possible (Step S103: YES), controls the transmission processing unit407so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal (Step S105). In contrast, in Step S103, the simultaneous transmission control unit4051, when it is determined that the simultaneous transmission of the signals with different uplink component frequency bands is not possible (Step S103: NO), determines whether or not the format of the physical uplink control channel signal is the second format (Step S106).

The simultaneous transmission control unit4051, when it is determined that the format of the physical uplink control channel signal is the second format (Step S106: YES), controls the transmission processing unit407so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal (Step S105). In contrast, the simultaneous transmission control unit4051, when it is determined that the format of the physical uplink control channel signal is not the second format, i.e., that it is the first format, controls the transmission processing unit407so as to transmit only the physical uplink control channel signal without transmitting the sounding reference signal (Step S104). After Step S104and Step S105, the mobile station apparatus5completes the processing related to the control of the transmission processing of the sounding reference signal and the physical uplink control channel signal, and repeats the same processing with respect to the subsequent uplink subframes.

As described above, in the embodiment of the present invention, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set in the same uplink subframe, the mobile station apparatus5, depending on whether each radio resource has been set to the same uplink component frequency band or each radio resource has been set to a different uplink component frequency band, can appropriately transmit the sounding reference signal and the physical uplink control channel signal by controlling the transmission processing of the sounding reference signal and the physical uplink control channel signal.

More specifically, in the case where the format of a physical uplink control channel signal is the first format in which a radio resource in a time domain to which a sounding reference signal may be allocated, i.e., an SC-FDMA symbol to which a sounding reference signal may be allocated, is used, the mobile station apparatus5, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to the same uplink component frequency band, performs control so as to transmit only the physical uplink control channel signal without transmitting the sounding reference signal. Thereby, an orthogonal sequence having the same sequence length as a physical uplink control channel with respect to the different mobile station apparatus5, in which a radio resource (an uplink resource block) of the same frequency domain as this physical uplink control channel is used, can be appropriately used and the orthogonalization between the physical uplink control channel signals can be reliably realized.

The mobile station apparatus5, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to a different uplink component frequency band, respectively, performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal. Thereby, the base station apparatus3can reliably achieve the orthogonalization between the signals of a physical uplink control channel with respect to a different mobile station apparatus5, in which a radio resource in the same frequency domain as this physical uplink control channel is used, and also can measure the uplink channel quality of an uplink component frequency band in which the reference signal has been transmitted. Accordingly, the mobile station apparatus5can reliably transmit a scheduling request to the base station apparatus3and keep the delay required to complete the transmission of data small, while the base station apparatus3can improve the efficiency of scheduling, adaptive modulation, and transmit power control by using the measured uplink channel quality.

Moreover, the mobile station apparatus5can control the transmission processing suitable for each format by controlling the transmission processing of a sounding reference signal and a physical uplink control channel signal in accordance with the format of the physical uplink control channel signal. The mobile station apparatus5, in addition to the first format, uses the second format that is a format, in which a radio resource in a time domain to which a sounding reference signal may be allocated, i.e., an SC-FDMA symbol to which a sounding reference signal may be allocated, is not used.

More specifically, in the case where the format of a physical uplink control channel signal is the second format, the mobile station apparatus5, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to the same uplink component frequency band, performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal. Thereby, the base station apparatus3can reliably achieve the orthogonalization between the signals of a physical uplink control channel with respect to a different mobile station apparatus5, in which a radio resource in the same frequency domain as this physical uplink control channel is used, and also can measure the uplink channel quality of an uplink component frequency band in which the sounding reference signal has been transmitted.

The mobile station apparatus5, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to a different uplink component frequency band, respectively, performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal. Thereby, the base station apparatus3can reliably achieve the orthogonalization between the signals of a physical uplink control channel with respect to the different mobile station apparatus5, in which a radio resource in the same frequency domain as this physical uplink control channel is used, and also can measure the uplink channel quality of an uplink component frequency band in which the sounding reference signal has been transmitted. Accordingly, the mobile station apparatus5can reliably transmit a scheduling request to the base station apparatus3and keep the delay required to complete the transmission of data small, while the base station apparatus3can improve the efficiency of scheduling, adaptive modulation, and transmit power control by using the measured uplink channel quality.

The mobile station apparatus5with the remaining small transmit power capable of transmission, in which the simultaneous transmission of the signals with different uplink component frequency bands is basically prohibited by the base station apparatus3, when the first format is used for the physical uplink control channel signal and the radio resources of a sounding reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, transmits only the physical uplink control channel signal without transmitting the sounding reference signal for the reason of the restriction on the transmit power. However, when the second format is used for the physical uplink control channel signal and the radio resources of the sounding reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, the above-described mobile station apparatus5can simultaneously transmit the sounding reference signal and the physical uplink control channel signal in the same uplink subframe without concern for the restrictions on the transmit power.

Because the radio resources of a sounding reference signal and a physical uplink control channel signal of a different uplink component frequency band are set to different SC-FDMA symbols, respectively, and the mobile station apparatus5does not essentially simultaneously-transmit the signals with different uplink component frequency bands in a unit of SC-FDMA symbol, and the transmit power required for each of the sounding reference signal and the physical uplink control channel signal will not be simultaneously generated, the mobile station apparatus5with the remaining small transmit power capable of transmission, when the format of the physical uplink control channel signal is the second format, can simultaneously transmit the sounding reference signal and the physical uplink control channel signal, whose radio resources have been set to a different uplink component frequency band, respectively, in the same uplink subframe.

Accordingly, the mobile station apparatus5with the remaining small transmit power capable of transmission, when the format of the physical uplink control channel signal is the first format and the radio resources of the sounding reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, performs control to transmit the physical uplink control channel signal without transmitting the sounding reference signal. In contrast, when the format of the physical uplink control channel signal is the second format and the radio resources of the sounding reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, the above-described mobile station apparatus5performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal. Thereby, the physical uplink control channel signal and the sounding reference signal can be appropriately transmitted in consideration of the restrictions on transmit power.

It should be noted that, in the uplink subframe that is not a sounding reference signal subframe, the format of a physical uplink control channel signal is the first format. Therefore, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been allocated to a different uplink component frequency band, respectively, and the uplink subframe of an uplink component frequency band, to which the radio resource of the physical uplink control channel signal has been allocated, is not a sounding reference signal subframe, the mobile station apparatus5with the remaining small transmit power capable of transmission transmits only the physical uplink control channel signal without transmitting the sounding reference signal. It should be noted that, here, a case is being described, where the uplink subframe with respect to an uplink component frequency band, to which the radio resource of the sounding reference signal has been allocated, is a sounding reference signal subframe, and the uplink subframe with respect to an uplink component frequency band, to which the radio resource of the physical uplink control channel signal has been allocated, is not a sounding reference signal subframe. When the radio resources of a sounding reference signal and a physical uplink control channel signal have been allocated to a different uplink component frequency band, respectively, and the uplink subframe of an uplink component frequency band, to which the radio resource of the physical uplink control channel signal has been allocated, is a sounding reference signal subframe, the mobile station apparatus with the remaining small transmit power capable of transmission5determines, in accordance with the format of the physical uplink control channel signal, whether the sounding reference signal and the physical uplink control channel signal are simultaneously transmitted or only the physical uplink control channel signal is transmitted.

It should be noted that, the present invention is not limited to the physical uplink control channel signal for transmission of a scheduling request. For example, the present invention can be applied also to a physical uplink control channel signal for transmission of a reception confirmation response, in which the first format and the second format as shown inFIG. 12are used. The mobile station apparatus5transmits the reception confirmation response with respect to a physical downlink shared channel signal in a sounding reference signal subframe by using a physical uplink control channel of the first format or the second format. The mobile station apparatus5, as with the case of the physical uplink control channel for transmission of a scheduling request described in the above embodiment, based on control information indicating whether the first format is used or the second format is used for the format of a physical uplink control channel signal in a sounding reference signal subframe, selects the format of the physical uplink control channel signal for transmission of a reception confirmation response.

FIG. 9is a diagram showing an example of a combination of the radio resources set to the sounding reference signal and the physical uplink control channel signal for transmission of a reception confirmation response in the embodiment of the present invention. Here, a case will be described, where two uplink component frequency bands (the first uplink component frequency band and the second uplink component frequency band) are used. A case will be described, where in the first uplink component frequency band and the second uplink component frequency band, a sounding reference signal subframe has been set for every two uplink subframes. Moreover, a case will be described, where in the first uplink component frequency band and the second uplink component frequency band, the radio resource of a sounding reference signal has been allocated for every three sounding reference signal subframes. Furthermore, a case will be described, where in the first uplink component frequency band, the first format is set to the physical uplink control channel of the sounding reference signal subframe up to the uplink subframe #4 and the second format is set to the physical uplink control channel of the sounding reference signal subframe of the uplink subframe #5 and thereafter.

First, a case will be described, where the radio resources of a sounding reference signal and a physical uplink control channel are set only to one of the uplink component frequency bands. A case will be described, where a physical uplink control channel of the first format is set in the sounding reference signal subframe of the first uplink component frequency band. The mobile station apparatus5, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to the same uplink subframe in the first uplink component frequency band (Case #5 ofFIG. 9), transmits only the physical uplink control channel signal without transmitting the sounding reference signal.

A case will be described, where a physical uplink control channel of the second format is set in the sounding reference signal subframe of the first uplink component frequency band. The mobile station apparatus5, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to the same uplink subframe in the first uplink component frequency band (Case #6 ofFIG. 9), simultaneously transmits the sounding reference signal and the physical uplink control channel signal.

Next, a case will be described, where the radio resources of a sounding reference signal and a physical uplink control channel are set to a different uplink component frequency band, respectively. A case will be described, where the physical uplink control channel of the first format is set in the sounding reference signal subframe of the first uplink component frequency band. The mobile station apparatus5, when the radio resource of a sounding reference signal has bee set in the same uplink subframe in the second uplink component frequency band, and the radio resource of a physical uplink control channel signal has been set in the first uplink component frequency band (Case #7 ofFIG. 9), simultaneously transmits the sounding reference signal and the physical uplink control channel signal. It should be noted that, the mobile station apparatus5having the remaining small transmit power capable of transmission, based on an instruction from the base station apparatus3, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to the same uplink subframe in a different uplink component frequency band, transmits only the physical uplink control channel signal without transmitting the sounding reference signal.

A case will be described, where the physical uplink control channel of the second format is set in the sounding reference signal subframe of the first uplink component frequency band. The mobile station apparatus5, when the radio resource of a sounding reference signal has been set in the same uplink subframe in the second uplink component frequency band, and the radio resource of a physical uplink control channel signal has been set in the first uplink component frequency band (Case #8 ofFIG. 9), simultaneously transmits the sounding reference signal and the physical uplink control channel signal. It should be noted that, the mobile station apparatus5, regardless of the remaining transmit power capable of transmission, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to the same uplink subframe with a different uplink component frequency band and the format of the physical uplink control channel signal is the second format, simultaneously transmits the sounding reference signal and the physical uplink control channel signal.

It should be noted that, the radio resource of the physical uplink control channel signal for transmission of a reception confirmation response is allocated to the uplink subframe after a predetermined period, e.g., after four downlink subframes, from the downlink subframe to which the radio resource of the physical downlink shared channel signal has been allocated. In the case of the radio resource of a physical uplink control channel signal for transmission of a reception confirmation response, which is different from the radio resource of a physical uplink control channel signal for transmission of a scheduling request, a periodic radio resource is not allocated from the base station apparatus3in advance, but notification of a radio resource allocation result of the physical uplink control channel signal is provided for every downlink subframe. For example, the mobile station apparatus5, when having detected a physical downlink control channel addressed to its own apparatus including information about the radio resource allocation of a physical downlink shared channel, determined that the radio resource of a physical uplink control channel signal corresponding to the radio resource used for a physical downlink control channel signal has been allocated, while when not having detected a physical downlink control channel addressed to its own apparatus, the mobile station apparatus5determines that the radio resource of a physical uplink control channel signal has not been allocated. It should be noted that, a radio resource that may be used in a physical downlink control channel signal within a downlink system bandwidth and a radio resource that may be used in the physical uplink control channel signal for transmission of a reception confirmation response within an uplink system bandwidth are associated with each other in advance, and the base station apparatus3and the mobile station apparatus5recognize this association.

As described above, the mobile station apparatus5of the present invention can appropriately transmit a sounding reference signal and a physical uplink control channel signal for transmission of a reception confirmation response. In the case where the format of the physical uplink control channel signal is the first format, the mobile station apparatus5, when the radio resources of the sounding reference signal and the physical uplink control channel signal have been set to the same uplink component frequency band, performs control so as to transmit only the physical uplink control channel signal without transmitting the sounding reference signal. Thereby, an orthogonal sequence having the same sequence length as the physical uplink control channel with respect to the different mobile station apparatus5, in which a radio resource (an uplink resource block) of the same frequency domain as this physical uplink control channel is used, can be appropriately used and the orthogonalization between the physical uplink control channel signals can be reliably realized.

The mobile station apparatus5, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to a different uplink component frequency band, respectively, performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal. Thereby, the base station apparatus3can measure the uplink channel quality of an uplink component frequency band in which the sounding reference signal has been transmitted, while reliably achieving the orthogonalization between the signals of a physical uplink control channel with respect to the different mobile station apparatus5, in which a radio resource in the same frequency domain as this physical uplink control channel is used. Accordingly, the mobile station apparatus5can reliably transmit a reception result with respect to a physical downlink shared channel signal to the base station apparatus3, and the base station apparatus3can suppress an unnecessary retransmission and achieve an efficient retransmission control. Furthermore, the base station apparatus3can improve the efficiency of scheduling, adaptive modulation, and transmit power control by using the measured uplink channel quality.

In the case where the format of a physical uplink control channel signal is the second format, the mobile station apparatus5, when the radio resources of the sounding reference signal and the physical uplink control channel signal have been set to the same uplink component frequency band, performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal. Thereby, the base station apparatus3can measure the uplink channel quality of an uplink component frequency band in which the sounding reference signal has been transmitted, while reliably achieving the orthogonalization between the signals of a physical uplink control channel with respect to the different mobile station apparatus5, in which a radio resource in the same frequency domain as this physical uplink control channel is used.

The mobile station apparatus5, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set to a different uplink component frequency band, respectively, performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal. Thereby, the base station apparatus3can measure the uplink channel quality of an uplink component frequency band in which the sounding reference signal has been transmitted, while reliably achieving the orthogonalization between the signals of a physical uplink control channel with respect to the different mobile station apparatus5, in which a radio resource in the same frequency domain as this physical uplink control channel is used.

The mobile station apparatus5can reliably transmit a reception result with respect to a physical downlink shared channel signal to the base station apparatus3, while the base station apparatus3can suppress an unnecessary retransmission and achieve an efficient retransmission control, and improve the efficiency of scheduling, adaptive modulation, and transmit power control by using the measured uplink channel quality. The mobile station apparatus5with the remaining small transmit power capable of transmission, in which the simultaneous transmission of the signals with different uplink component frequency bands is basically prohibited by the base station apparatus3, when the first format is used for the physical uplink control channel signal and the radio resources of the sounding reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, transmits only the physical uplink control channel signal without transmitting the sounding reference signal for the reason of the restriction on the transmit power. In contrast, the mobile station apparatus5, when the second format is used for the physical uplink control channel signal and the radio resources of the sounding reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, can simultaneously transmit the sounding reference signal and the physical uplink control channel signal in the same uplink subframe without concern for the restrictions on the transmit power.

Accordingly, the mobile station apparatus5with the remaining small transmit power capable of transmission, when the format of the physical uplink control channel signal is the first format and the radio resources of the sounding reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, performs control so as to transmit the physical uplink control channel signal without transmitting the sounding reference signal, while when the format of the physical uplink control channel signal is the second format and the radio resources of the sounding reference signal and the physical uplink control channel signal have been set to a different uplink component frequency band, respectively, the above-described mobile station apparatus5performs control so as to simultaneously transmit the sounding reference signal and the physical uplink control channel signal, and thus a physical uplink control channel signal for transmission of a reception confirmation response and a sounding reference signal can be appropriately transmitted in consideration of the restrictions on the transmit power.

It should be noted that the present invention is not limited to the radio communication system1composed of the number of uplink component frequency bands that are used for description in the above-described embodiment. The present invention can be applied also to the radio communication system1composed of a different number of uplink component frequency bands.

It should be noted that, in the above embodiment of the present invention, a case has been shown, where the radio resource of a sounding reference signal is set in advance by the mobile station apparatus5by using a physical downlink shared channel, but the present invention can be applied also to a case where the allocation of the radio resource of a sounding reference signal is performed by using a physical downlink control channel for each subframe. The base station apparatus3determines whether or not the allocation of the radio resource of a sounding reference signal is performed on the mobile station apparatus5for each downlink subframe, and if it is determined that the radio resource allocation of a sounding reference signal is performed, the base station apparatus3transmits a physical downlink control channel including the information about the radio resource allocation of a sounding reference signal to the mobile station apparatus5.

The mobile station apparatus5performs the detection processing of a physical downlink control channel signal addressed to its own apparatus including the radio resource allocation of a sounding reference signal, for each downlink subframe, and when the physical downlink control channel signal addressed to its own apparatus including the radio resource allocation of a sounding reference signal has been detected, the mobile station apparatus5recognizes that the radio resource of the sounding reference signal has been allocated in an uplink subframe corresponding to the downlink subframe, in which the physical downlink control channel signal has been detected, e.g., in an uplink subframe corresponding to the fourth downlink subframe after the downlink subframe in which the physical downlink control channel signal has been detected, or in the temporally closest sounding reference signal subframe after a predetermined period from the downlink subframe in which the physical downlink control channel signal has been detected, or in a predetermined sounding reference signal subframe. When the radio resource of a physical uplink control channel signal has been allocated in the same uplink subframe as the uplink subframe to which the radio resource of a sounding reference signal has been allocated, the mobile station apparatus5, according to whether each radio resource has been set to the same uplink component frequency band or each radio resource has been set to a different uplink component frequency band, controls the transmission processing of a sounding reference signal and a physical uplink control channel signal.

Here, the format of a physical downlink control channel signal including the information about the radio resource allocation of a sounding reference signal may differ from the format of a physical downlink control channel signal including other information, or the same format may be applied. When the same format is applied, the mobile station apparatus5modifies the interpretation of a different information field in accordance with a value of the information field of a part of the format, and determines whether a physical downlink control channel signal includes the information about the radio resource allocation of a sounding reference signal or includes other information. Moreover, a single physical downlink control channel may include the information about the radio resource allocation of a sounding reference signal of the single mobile station apparatus5, or may include the information about the radio resource allocation of a sounding reference signal of a plurality of mobile station apparatuses5. Furthermore, the mobile station apparatus5is not limited to a moving terminal, and the present invention may be realized, for example, by implementing the function of the mobile station apparatus into a fixed terminal.

The characteristic procedure of the present invention described above can be realized also by implementing the function into an integrated circuit and controlling the same. That is, an integrated circuit of the present invention is an integrated circuit causing the mobile station apparatus5to perform a plurality of functions when being mounted on the mobile station apparatus5, the integrated circuit causing the mobile station apparatus to perform a series of functions including the functions of: transmitting a signal to a base station apparatus3by using one or more component frequency bands each having a predetermined frequency bandwidth; setting a radio resource of a reference signal for measuring channel quality and a radio resource of a physical uplink control channel; controlling a signal transmission processing depending on whether each radio resource has been set to a same component frequency band or each radio resource has been set to a different, when transmitting the physical uplink control channel signal in a time frame in which the radio resource of the reference signal has been set; and transmitting the reference signal and/or physical uplink control channel signal based on the control of the signal transmission processing.

In this manner, the mobile station apparatus5using the integrated circuit of the present invention, when the radio resources of a sounding reference signal and a physical uplink control channel signal have been set in the same uplink subframe, according to whether each radio resource has been set to the same uplink component frequency band or each radio resource has been set to a different uplink component frequency band, controls the transmission processing of the sounding reference signal and the physical uplink control channel signal. Thereby, the mobile station apparatus5can appropriately transmit the sounding reference signal and the physical uplink control channel signal.

A program operating in the mobile station apparatus5and the base station apparatus3according to the present invention is a program (a program causing a computer to function) that controls a CPU and the like so as to realize the functions of the above-described embodiment according to the present invention. Then, the information handled in these device and apparatus is temporarily stored in a RAM during the information processing, and is then stored in various ROMs or HDD, and is read, modified, and/or written by the CPU as required. As the recording medium storing the program, any of a semiconductor medium (e.g., ROM, a nonvolatile memory card, etc.), an optical recording medium (e.g., DVD, MO, MD, CD, BD, etc.), and a magnetic recording medium (e.g., a magnetic tape, a flexible disk, etc.) may be employed. Moreover, not only the functions of the above-described embodiment may be realized by executing a loaded program, but also the functions of the present invention may be realized by processing in conjunction with an operating system or other application programs according to an instruction of the program.

Moreover, when circulating the program in the market, the program can be stored into a portable recording medium and circulated, or the program can be transferred to a server computer coupled via a network, such as the Internet. In this case, a storage device of the server computer is also within the scope of the present invention. Moreover, a part or the whole of the mobile station apparatus5and the base station apparatus3in the above-described embodiment may be realized as an LSI that is typically an integrated circuit. Each functional block of the mobile station apparatus5and the base station apparatus3may be individually formed in one chip, or a part or the whole thereof may be integrated and formed in one chip. Moreover, the integration approach is not limited to an LSI, but may be realized by an application specific circuit or a general-purpose processor. Moreover, if an integration technology replacing the LSI would have emerged due to a progress in the semiconductor technologies, an integrated circuit by means of this technique may be used.

In the foregoing, the embodiment of the present invention has been described in detail with reference to the accompanying drawings, but the specific configuration is not limited to this embodiment, and the design and the like that do not depart from the scope of the present invention are also within the scope of the claims.

DESCRIPTION OF REFERENCE NUMERALS