WO2011102181A1

WO2011102181A1 - Wireless communication system, base station device, mobile station device and wireless communication method

Info

Publication number: WO2011102181A1
Application number: PCT/JP2011/050984
Authority: WO
Inventors: 渉大内; 立志相羽; 翔一鈴木; 陽介秋元
Original assignee: シャープ株式会社
Priority date: 2010-02-18
Filing date: 2011-01-20
Publication date: 2011-08-25
Also published as: JP2011171972A

Abstract

Disclosed is a wireless transmission system which can transmit channel-side sounding reference signals before the end of a set expiry period in one exchange of signalling. The wireless transmission system is comprised of a base station device and a mobile station device. The base station device transmits wireless resource control signals to the mobile station device including information indicating the expiry period of a channel-side sounding reference signal. The transmission to the mobile station device which includes the information indicated by the reference signal is made on a physical downlink control channel. When the mobile station device receives a transmission on the physical downlink control channel which includes the indicated information, it transmits reference signals to the base station device before the end of the expiry period.

Description

Wireless communication system, base station apparatus, mobile station apparatus, and wireless communication method

The present invention relates to a radio communication system composed of a mobile station apparatus and a base station apparatus, and more particularly to a transmission control method for a reference signal for channel measurement of the mobile station apparatus.

Conventionally, cellular mobile radio access systems and wireless network evolution (hereinafter referred to as “Long Term Evolution (LTE)” or “Evolved Universal Terrestrial Radio Access (EUTRA))) and broadband than LTE. Wireless access method and wireless network (hereinafter referred to as “Long Term Evolution-Advanced (LTE-A)”) or “Advanced Evolved Universal Terrestrial Radio Access- (A- EUTRA) ”) is being considered in the 3rd Generation Partnership Project (3rd Generation Partnership Project; 3GPP).

In LTE-A, in addition to a channel measurement reference signal (P-SRS: チャネル Periodic Sounding Reference Signal) transmitted at a periodic timing set by the base station device, a transmission request is notified from the base station device. A reference signal for channel measurement (A-SRS: Aperiodic Sounding Reference Signal), which is transmitted only in a non-patent document 1, has been proposed.

However, in the prior art, only when the mobile station apparatus transmits the reference signal A-SRS for channel measurement, only when the transmission request is notified from the base station apparatus using the physical downlink control channel, the base station apparatus The station apparatus cannot obtain sufficient channel measurement accuracy for the uplink. In addition, if the mobile station apparatus transmits a reference signal for which sufficient channel measurement accuracy cannot be obtained, it not only wastes resources of the uplink signal, but also performs efficient frequency selection scheduling in the base station apparatus. I can't do that.

Further, every time the base station apparatus requests transmission of a reference signal for channel measurement, if the physical downlink control channel is used, resources of the downlink signal are wasted, and the base station apparatus and the mobile station apparatus Cannot communicate efficiently.

Also, when the mobile station apparatus erroneously detects information instructing transmission of a channel measurement reference signal included in the physical downlink control channel, the mobile station apparatus does not have an A-SRS transmission request. Since the A-SRS is transmitted to the base station apparatus, it interferes with the A-SRS transmitted by another mobile station apparatus, and the base station apparatus cannot perform accurate uplink channel measurement. .

The present invention has been made in view of the above points, and improves the efficient transmission of a reference signal for channel measurement and the accuracy of uplink channel measurement when a transmission request is notified from the base station apparatus. An object of the present invention is to provide a wireless communication system, a base station device, a mobile station device, and a wireless communication method.

(1) In order to achieve the above object, the present invention has taken the following measures. That is, the radio communication system of the present invention is a radio communication system including a base station apparatus and a mobile station apparatus, and the base station apparatus instructs an expiration time (Expiration time) of a reference signal for channel measurement. A radio resource control signal (RRC signaling: Radio Resource Control Signaling) including information is transmitted to the mobile station apparatus, and a physical downlink control channel including information instructing transmission of the reference signal (Activation) is transmitted to the mobile station. The mobile station device transmits the reference signal to the base station device until the expiration time is reached when the physical downlink control channel includes information instructing transmission of the reference signal. It is characterized by transmitting.

In this way, the base station apparatus can instruct the mobile station apparatus to transmit the A-SRS until a predetermined expiration time with only one transmission request, thereby improving uplink channel measurement accuracy. be able to.

(2) The radio communication system according to the present invention is a radio communication system including a base station apparatus and a mobile station apparatus, and the base station apparatus includes information indicating an expiration time of a reference signal for channel measurement. A radio resource control signal is transmitted to the mobile station apparatus, a radio resource control signal including information indicating whether or not to perform frequency hopping of the reference signal is transmitted to the mobile station apparatus, and the reference signal is transmitted. When the physical downlink control channel including information instructing is transmitted to the mobile station apparatus, and the mobile station apparatus includes information instructing transmission of the reference signal in the physical downlink control channel. In accordance with the information indicating the frequency hopping included in the radio resource control signal, the reference is performed while performing frequency hopping until the expiration time is reached. It is characterized by transmitting a signal to the base station apparatus.

In this way, by applying frequency hopping, the frequency diversity effect and interference averaging effect by frequency hopping can be obtained, and the base station apparatus improves efficient frequency selection scheduling and uplink channel measurement accuracy. Can be made.

(3) The radio communication system of the present invention is a radio communication system including a base station device and a mobile station device, and the base station device includes information indicating an expiration time of a reference signal for channel measurement. A radio resource control signal is transmitted to the mobile station apparatus, and a radio resource control signal including information indicating whether the mobile station apparatus performs antenna selection is transmitted to the mobile station apparatus. When a physical downlink control channel including information instructing transmission is transmitted to the mobile station apparatus, and the mobile station apparatus includes information instructing transmission of the reference signal in the physical downlink control channel In addition, according to the information indicating the antenna selection included in the radio resource control signal, the reference signal is transmitted in advance while performing antenna selection until the expiration time is reached. It is characterized in that to the base station apparatus.

As described above, by transmitting the A-SRS until the predetermined expiration time is reached while switching the antenna, the channel measurement accuracy for each antenna can be improved, and the base station apparatus uses a higher quality antenna. Communication. In addition, since channel measurement of a plurality of antennas can be performed, switching to MIMO (Multiple Input Multiple Output) communication can be performed efficiently.

(4) The radio communication system of the present invention is characterized in that a subframe in which the mobile station apparatus transmits the reference signal is set for each cell.

(5) The radio communication system of the present invention is characterized in that the mobile station apparatus sets a subframe for transmitting the reference signal for each mobile station apparatus.

(6) In the radio communication system of the present invention, the subframe in which the mobile station apparatus transmits the reference signal includes a subframe set for each cell and a subframe set for each mobile station apparatus. It is characterized by that.

Thus, by specifying a subframe for transmitting A-SRS, the mobile station apparatus can perform more flexible A-SRS transmission.

(7) A base station apparatus according to the present invention is a base station apparatus that communicates with a mobile station apparatus, and transmits a radio resource control signal including information indicating an expiration time of a reference signal for channel measurement to the mobile station apparatus And means for transmitting a physical downlink control channel including information instructing transmission of the reference signal to the mobile station apparatus.

Thus, the base station apparatus of the present invention can instruct the mobile station apparatus to transmit the A-SRS until a predetermined expiration time is reached by making a single transmission request.

(8) A base station apparatus of the present invention is a base station apparatus that communicates with a mobile station apparatus, and transmits a radio resource control signal including information indicating an expiration time of a reference signal for channel measurement to the mobile station apparatus Means for transmitting to the mobile station apparatus, information for instructing transmission of the reference signal, means for transmitting the radio resource control signal including information instructing whether or not to perform frequency hopping of the reference signal Means for transmitting a physical downlink control channel to the mobile station apparatus.

As described above, the base station apparatus of the present invention can instruct the mobile station apparatus to transmit the A-SRS until a predetermined expiration time is reached while performing frequency hopping by making a single transmission request. .

(9) A base station apparatus according to the present invention is a base station apparatus that communicates with a mobile station apparatus, and transmits a radio resource control signal including information indicating an expiration time of a reference signal for channel measurement to the mobile station apparatus Means for transmitting to the mobile station apparatus, information for instructing transmission of the reference signal, means for transmitting a radio resource control signal including information instructing whether or not the mobile station apparatus performs antenna selection, and Means for transmitting the contained physical downlink control channel to the mobile station apparatus.

Thus, the base station apparatus of the present invention instructs the mobile station apparatus to transmit A-SRS until a predetermined expiration time is reached while performing antenna selection (switching) by making a single transmission request. be able to.

(10) The mobile station apparatus of the present invention is a mobile station apparatus that communicates with a base station apparatus, and when the physical downlink control channel includes information instructing transmission of the reference signal, Means are provided for transmitting a reference signal to the base station apparatus until the expiration time is reached.

Thus, the mobile station apparatus of the present invention can transmit the A-SRS until a predetermined expiration time is reached with a single transmission request from the base station apparatus.

(11) The mobile station apparatus of the present invention is a mobile station apparatus that communicates with a base station apparatus, and when the physical downlink control channel includes information instructing transmission of the reference signal, According to the information indicating the frequency hopping included in the radio resource control signal, there is provided means for transmitting the reference signal to the base station apparatus while performing frequency hopping until the expiration time is reached.

Thus, the mobile station apparatus of the present invention can transmit the A-SRS until a predetermined expiration time is reached while performing frequency hopping with a single transmission request.

(12) The mobile station apparatus of the present invention is a mobile station apparatus that communicates with a base station apparatus, and when the physical downlink control channel includes information instructing transmission of the reference signal, According to the information indicating the antenna selection included in the radio resource control signal, there is provided means for transmitting the reference signal to the base station apparatus while performing antenna selection until the expiration time is reached.

Thus, the mobile station apparatus of the present invention can transmit an A-SRS until a predetermined expiration time is reached while performing antenna selection (switching) with a single transmission request.

(13) A radio communication method of the present invention is a radio communication method of a radio communication system including a base station device and a mobile station device, and the base station device indicates an expiration time of a reference signal for channel measurement. Transmitting a radio resource control signal including information to the mobile station apparatus, and transmitting a physical downlink control channel including information instructing transmission of the reference signal to the mobile station apparatus. And the mobile station apparatus transmits the reference signal to the base station apparatus until the expiration time is reached when the physical downlink control channel includes information instructing transmission of the reference signal. And at least a step.

Thus, in the wireless communication method of the present invention, the mobile station apparatus can transmit the A-SRS until a predetermined expiration time is reached by a single transmission request from the base station apparatus.

(14) A radio communication method of the present invention is a radio communication method of a radio communication system including a base station device and a mobile station device, and the base station device indicates an expiration time of a reference signal for channel measurement. Transmitting a radio resource control signal including information to be transmitted to the mobile station apparatus, and transmitting a radio resource control signal including information indicating whether to perform frequency hopping of the reference signal to the mobile station apparatus And at least a step of transmitting a physical downlink control channel including information instructing transmission of the reference signal to the mobile station device, the mobile station device including the physical downlink control channel in the physical downlink control channel When information for instructing transmission of a reference signal is included, follow the information for instructing frequency hopping included in the radio resource control signal. , While performing frequency hopping to reach the expiration time, it is characterized in that the reference signal has at least the steps of: transmitting to said base station apparatus.

As described above, in the wireless communication method of the present invention, the mobile station apparatus can transmit the A-SRS while performing frequency hopping until a predetermined expiration time is reached by a single transmission request from the base station apparatus.

(15) A radio communication method of the present invention is a radio communication method of a radio communication system including a base station apparatus and a mobile station apparatus, and the base station apparatus indicates an expiration time of a reference signal for channel measurement Transmitting a radio resource control signal including information to be transmitted to the mobile station apparatus, and transmitting a radio resource control signal including information indicating whether the mobile station apparatus performs antenna selection to the mobile station apparatus And transmitting a physical downlink control channel including information instructing transmission of the reference signal to the mobile station apparatus, the mobile station apparatus using the physical downlink control channel If information indicating the transmission of the reference signal is included, the information indicating the antenna selection included in the radio resource control signal is While performing antenna selection until the expiration time, it is characterized in that the reference signal has at least the steps of: transmitting to said base station apparatus.

As described above, in the wireless communication method of the present invention, the mobile station apparatus can transmit the A-SRS while performing antenna selection (switching) until a predetermined expiration time is reached with a single transmission request from the base station apparatus. it can.

According to the present invention, it is possible to improve an efficient method of transmitting a reference signal for channel measurement transmitted only when a transmission request is notified from a base station device to a mobile station device, and uplink channel measurement accuracy. A mobile station device, a base station device, a wireless communication system, and a wireless communication method that can be provided can be provided.

It is a block diagram which shows schematic structure of the base station apparatus 1 of this invention. It is a block diagram which shows schematic structure of the mobile station apparatus 3 of this invention. It is the figure which showed an example of the signaling for A-SRS transmission in the 1st Embodiment of this invention. It is the figure which showed an example of the signaling for A-SRS transmission in the 2nd Embodiment of this invention. It is the figure which showed an example of the signaling for A-SRS transmission in the 3rd Embodiment of this invention. It is a figure which shows schematic structure of the resource allocation of SRS and frequency hopping (FH: Frequency Hopping) in the present invention.

Before starting a specific description of each embodiment, an outline of the communication technology used in the present invention will be briefly described.

(Physical channel)
The physical channel used in the present invention includes a physical broadcast channel (PBCH), a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), DL-RS (Downlink Reference Signal or Cell-specific Reference Signal), Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), Physical A random access channel (PRACH: Physical Random Access Channel), an uplink reference signal (UL-RS), and the like are included. Note that each embodiment of the present invention described later can be applied even if different physical channel types are added to the physical channel.

The physical broadcast channel is transmitted for the purpose of reporting control parameters (broadcast information) that are commonly used by mobile station apparatuses in the cell. The broadcast information that is not notified on the physical broadcast channel is transmitted using the physical downlink shared channel with the resource notified on the physical downlink control channel. As broadcast information, a cell global ID indicating an individual ID (Identity) of the cell is notified. In the PBCH, a broadcast channel (BCH: “Broadcast” Channel) is mapped at intervals of 40 milliseconds. The timing of 40 milliseconds is blind-detected in the mobile station apparatus. That is, no explicit signaling is transmitted to the mobile station apparatus for timing presentation of the physical broadcast channel. In addition, a subframe including a physical broadcast channel (PBCH) can be decoded only by the subframe (self-decodable).

The physical downlink control channel is a downlink channel transmitted from the base station apparatus to the mobile station apparatus. The physical downlink shared channel resource allocation, downlink data (DL-SCH: Downlink-Shared Channel, downlink shared channel) ) Hybrid automatic retransmission request (HARQ) information for downlink transmission allocation (downlink assignment or downlink grant) and uplink transmission permission (uplink grant) for physical uplink shared channel resource allocation It is a channel used for notifying a mobile station apparatus.

The physical downlink shared channel is a channel used for transmitting downlink data, a radio resource control signal (RRC signaling) or paging information.

The downlink reference signal is transmitted from the base station apparatus to the mobile station apparatus using the downlink. The mobile station apparatus determines downlink reception quality by measuring a downlink reference signal. The reception quality is reported to the base station apparatus using a physical uplink control channel or a physical uplink shared channel as CQI (Channel Quality Indicator) that is a quality information index. The base station apparatus performs downlink communication scheduling for the mobile station apparatus based on the CQI notified from the mobile station apparatus. The reception quality includes SIR (Signal-to-InterferenceInterRatio), SINR (Signal-to-Interference plus Noise Ratio), SNR (Signal-to-Noise Ratio). : Signal-to-noise power ratio), CIR (Carrier-to-Interference Ratio), BLER (Block Error Rate), path loss, etc. can be used.

The physical uplink shared channel is a channel mainly used for transmitting uplink data (UL-SCH: Uplink Shared Channel, uplink shared channel). When the base station apparatus schedules the mobile station apparatus, channel state information (downlink channel quality indicator (CQI: Channel Quality Indicator), precoding matrix indicator (PMI: Precoding Matrix Indicator), rank indicator (RI: Rank Indicator)) and hybrid automatic repeat request (HARQ: Hybrid Automatic Repeat Request) acknowledgment (ACK: Acknowledgement) / Negative response (NACK: Negative Acknowledgement) are also transmitted using the physical uplink shared channel. The Here, uplink data (UL-SCH) indicates transmission of user data, for example, and UL-SCH is a transport channel. In UL-SCH, HARQ and dynamic adaptive radio link control are supported, and beamforming can be used. UL-SCH supports dynamic resource allocation and quasi-static resource allocation.

The physical uplink control channel is a channel used for transmitting control data. Here, the control data is, for example, channel state information (CQI, PMI, RI) transmitted (feedback) from the mobile station apparatus to the base station apparatus, and resource allocation for the mobile station apparatus to transmit uplink data Scheduling requests (requesting transmission on UL-SCH) (SR: Scheduling Request), HARQ ACK / NACK for downlink transmission, and the like are included.

The uplink reference signal is transmitted from the mobile station device to the base station device. The uplink reference signal includes a sounding reference signal (SRS: Sounding Reference Signal) and a demodulation reference signal (DM-RS: Demodulation Reference Signal). The SRS, which is a channel measurement reference signal, is measured by the base station apparatus to determine the reception quality of the uplink radio transmission signal of the mobile station apparatus, and uplink scheduling and uplink timing synchronization based on the reception quality are performed. Used for adjustment. The DM-RS is transmitted together with the physical uplink shared channel or the physical uplink control channel, calculates the amplitude, phase and frequency fluctuation amount of the signal of the physical uplink shared channel or the physical uplink control channel, and calculates the physical uplink. It is also used as a reference signal for demodulating a signal transmitted using a link shared channel or a physical uplink control channel. The transmission bandwidth of DM-RS matches the transmission bandwidth of PUSCH or PUCCH, but the transmission bandwidth of SRS is set independently of DM-RS. That is, the SRS transmission bandwidth does not necessarily match the PUSCH or PUCCH transmission bandwidth, and is preset by the base station apparatus. Further, frequency hopping is applied to the SRS in the time axis direction. SRS can obtain a frequency diversity effect and an interference averaging effect by using frequency hopping.

The SRS includes a first reference signal (A-SRS: Aperiodic SRS) and a second reference signal (P-SRS: Periodic SRS). The first reference signal is a reference signal for channel measurement transmitted when the base station apparatus requests transmission, and the subframe for transmitting the first reference signal is a physical downlink control channel by the base station apparatus. Or may be set using a radio resource control signal (RRC signaling). Here, the radio resource control signal is transmitted at intervals of 100 milliseconds to 200 milliseconds. Further, the second reference signal (P-SRS: “Periodic” SRS) is a channel measurement reference signal transmitted in accordance with a transmission period preset by the base station apparatus, and is a sub-signal for transmitting the second reference signal. The frame may be set using a radio resource control signal by the base station apparatus, or may be set using a broadcast channel (for example, system information). Here, the system information is information including setting information indicating the bandwidth and transmission cycle of SRS, control information and scheduling information for each uplink / downlink channel, and the like.

In addition, the setting information regarding the SRS parameters such as the transmission period and the transmission bandwidth of each of the first reference signal and the second reference signal is included in the radio resource control signal after being set in advance by the base station apparatus. The device is notified. Further, subframes for transmitting the SRS (each of the subframes for transmitting the first reference signal and the second reference signal) may be set for each cell (cell-specific). Further, the subframe for transmitting the SRS may be set for each mobile station apparatus (specific to the mobile station apparatus). Further, the subframe for transmitting the SRS may be set for each component carrier (component carrier specific). Further, the same subframe may be used for the first reference signal and the second reference signal as subframes for transmitting the SRS. In addition, as subframes for transmitting SRS, different subframes may be used for the first reference signal and the second reference signal. For example, the transmission subframe of the first reference signal can be set for each cell, and the transmission subframe of the second reference signal can be set for each mobile station apparatus.

The physical random access channel is a physical channel used for transmitting a random access preamble and has a guard time. The physical random access channel is used mainly for the purpose of the mobile station apparatus synchronizing with the base station apparatus, and is used for initial access, handover, reconnection request, and scheduling request.

The scheduling request is information that the mobile station apparatus requests the base station apparatus to allocate a physical uplink shared channel resource. The mobile station apparatus transmits a scheduling request when information data to be transmitted accumulates in its own buffer and requests resource allocation of the physical uplink shared channel. In addition, the mobile station apparatus transmits a scheduling request to the base station apparatus using a physical uplink control channel previously assigned by the base station apparatus. Note that the base station apparatus allocates periodic resources for the mobile station apparatus to place a scheduling request when communication connection with the mobile station apparatus starts.

(SRS resource allocation and frequency hopping)
FIG. 6 is a diagram illustrating a schematic configuration of SRS resource allocation and frequency hopping (FH). In the figure, the horizontal axis is time, and the vertical axis is frequency. The left side of the figure shows an example of SRS resource allocation. In the example on the left side of the figure, 14 symbols are arranged in the time axis direction. Seven symbols correspond to one slot, and the length of one slot is 0.5 milliseconds (ms). Further, 14 symbols (corresponding to 2 slots) correspond to 1 subframe, and the length of 1 subframe is 1 millisecond. Thus, in an uplink signal in which one subframe is composed of 14 symbols, for example, SRS is allocated to the 14th symbol of the subframe. The SRS resource (bandwidth in the frequency direction) allocated to the 14th symbol is set according to the uplink system bandwidth and the transmission power of the mobile station apparatus.

Also, for the time axis direction, frequency hopping that changes the frequency position every time transmission is applied. The right side of the figure shows an example of SRS frequency hopping. On the right side of the figure, SRS is transmitted every transmission period T. As shown in the figure, hopping is performed in the frequency direction every period T (that is, every transmission).

<First Embodiment>
The first embodiment will be described below. In the first embodiment, the base station device 1 transmits to the mobile station device 3 a radio resource control signal including information indicating the expiration time of the channel measurement reference signal, and transmits the channel measurement reference signal. A physical downlink control channel including information instructing (Activation) is transmitted to the mobile station apparatus 3. The mobile station apparatus 3 includes information for setting the reference signal expiration time in accordance with the information indicating the expiration time included in the radio resource control signal and instructing the physical downlink control channel to transmit the reference signal. In this case, the reference signal is transmitted to the base station apparatus 1 until the expiration time is reached after receiving the physical downlink control channel. In the first embodiment, when the information instructing transmission of A-SRS is included in the PDCCH, the mobile station device 3 can transmit A-SRS until a predetermined expiration time is reached.

FIG. 1 is a block diagram showing a schematic functional configuration of the base station apparatus 1 of the present invention. The base station device 1 includes a transmission unit 101, a reception unit 103, a scheduling unit 105, an upper layer 107, and an antenna 109. The transmission unit 101 includes a data control unit 1011, a modulation unit 1013, and a wireless transmission unit 1015. In addition, the reception unit 103 includes a wireless reception unit 1031, a demodulation unit 1033, and a data extraction unit 1035. The data control unit 1011 receives user data and control data, places control data on the PDCCH, and places transmission data and control data for each mobile station apparatus 3 on the PDSCH according to an instruction from the scheduling unit 105. The modulation unit 1013 performs signal processing such as data modulation, serial / parallel conversion of input signals, IFFT, CP insertion, and filtering, and generates a transmission signal. The radio transmission unit 1015 transmits the modulated data to the mobile station apparatus 3 via the antenna 109 after up-converting the modulated data to a radio frequency.

The radio reception unit 1031 receives an uplink signal from the mobile station apparatus 3, down-converts it to a baseband signal, and outputs received data to the demodulation unit 1033. The data extraction unit 1035 confirms the correctness of the received data and notifies the scheduling unit 105 of the confirmation result. If the received data is correct, the data extraction unit 1035 separates the received data into user data and control data. The data extraction unit 1035 outputs the control data of the second layer such as downlink channel quality indication information and the success / failure of the downlink data (ACK / NACK) in the control data to the scheduling unit 105, and the other data The control data and user data of the third layer and the like are output to the upper layer 107. If the received data is in error, the data extraction unit 1035 stores the received data for combining with the retransmitted data, and performs a combining process when the retransmitted data is received.

The scheduling unit 105 performs scheduling for arranging user data and control data on the PDSCH and PDCCH.

The upper layer 107 includes a medium access control (MAC: Medium Access Control) layer, a radio link control (RLC: Radio Link Control) layer, a packet data convergence protocol (PDCP: Packet Data Convergence Protocol) layer, and a radio resource control (RRC: Radio). Resource (Control) layer processing. The upper layer 107 has an interface between the upper layer 107 and the scheduling unit 105, the antenna 109, the transmission unit 101, and the reception unit 103 in order to control the processing unit of the lower layer in an integrated manner (however, not shown) ).

The upper layer 107 has a radio resource control unit 1071 (also referred to as a control unit). The radio resource control unit 1071 also manages various setting information, system information, paging control, communication state management of each mobile station device, mobility management such as handover, buffer status management for each mobile station device, It manages connection settings for cast and multicast bearers, manages mobile station identifiers (UEIDs), and so on. Further, the upper layer 107 transmits / receives information to another base station apparatus 1 and information to an upper node.

FIG. 2 is a block diagram showing a schematic functional configuration of the mobile station apparatus 3 of the present invention. The mobile station apparatus 3 includes a transmission unit 201, a reception unit 203, a scheduling unit 205, a reference signal generation unit 206, an upper layer 207, a timer control unit 208, and an antenna 209. The transmission unit 201 includes a data control unit 2011, a modulation unit 2013, and a wireless transmission unit 2015. The reception unit 203 includes a wireless reception unit 2031, a demodulation unit 2033, and a data extraction unit 2035.

User data and control data are input from the upper layer 207 to the data control unit 2011. The data control unit 2011 arranges the input data on the PUSCH or PUCCH according to an instruction from the scheduling unit 205. The modulation unit 2013 performs data modulation on PUSCH and PUCCH and outputs the data to the radio transmission unit 2015. The wireless transmission unit 2015 inserts the modulated data and the uplink reference signal into a discrete Fourier transform (DFT: Discrete Fourier Transform), subcarrier mapping, inverse fast Fourier transform (IFFT: Inverse Fast Fourier Transform), and CP (Cyclic Prefix). Signal processing such as filtering is performed, a transmission signal is generated, up-converted to a radio frequency, and then transmitted to the base station apparatus 1 via the antenna 209.

The radio reception unit 2031 receives the downlink signal from the base station apparatus 1, down-converts it to a baseband signal, and outputs the received signal to the demodulation unit 2033. The demodulator 2033 demodulates the received data. The data extraction unit 2035 separates the received data into user data and control data. The data extraction unit 2035 outputs scheduling information, random access response messages, control data related to intermittent reception control, and other second layer control data to the scheduling unit 205 and outputs user data to the upper layer 207.

The scheduling unit 205 analyzes the control data input from the data extraction unit 2035, generates uplink scheduling information, and performs data control to allocate user data and control data to PUSCH and PUCCH based on the scheduling information. Section 2011 is instructed.

The scheduling unit 205 includes a reference signal control unit 2051. The reference signal control unit 2051 extracts SRS setting information based on the scheduling information transmitted from the base station apparatus 1. Based on the SRS setting information, various parameters of the first reference signal (A-SRS) and the second reference signal (P-SRS) are set. Further, transmission control is performed when the first reference signal for channel measurement, the second reference signal, and the physical uplink control channel are generated at the same timing, and SRS transmission control information is generated. The reference signal control unit 2051 outputs the SRS setting information and the SRS transmission control information to the reference signal generation unit 206.

The reference signal generation unit 206 generates the first reference signal and / or the second reference signal based on the SRS setting information and the SRS transmission control information input from the reference signal control unit 2051, and transmits the first reference signal and / or the second reference signal to the wireless transmission unit 2015. Output.

The upper layer 207 includes a medium access control (MAC: Medium Access Control) layer, a radio link control (RLC: Radio Link Control) layer, a packet data convergence protocol (PDCP: Packet Data Convergence Protocol) layer, and a radio resource control (RRC: Radio) Resource (Control) layer processing. Since the upper layer 207 controls the processing units of the lower layer in an integrated manner, there is an interface between the upper layer 207 and the scheduling unit 205, timer control unit 208, antenna 209, transmission unit 201, and reception unit 203. (However, not shown).

The upper layer 207 has a radio resource control unit 2071 (also referred to as a control unit). The radio resource control unit 2071 manages various setting information, system information, paging control, communication status management of the local station, mobility management such as handover, buffer status management, unicast and multicast bearer connection setting management The mobile station identifier (UEID) is managed.

The timer control unit 208 is used to adjust the transmission timing between the base station apparatus 1 and the mobile station apparatus 3, and measures the time from signal transmission to response to the signal, and signals and components for timing Using a different timer for each carrier, time (such as transmission time and synchronization time) according to the purpose is counted. In particular, in the present invention, based on the SRS setting information input from the reference signal control unit 2051, a transmission timer for measuring the time for transmitting the SRS is set, and the SRS is transmitted from the wireless transmission unit 2015. Then, the transmission timer is controlled to start. When the transmission timer reaches the expiration time, the transmission timer stops and notifies the upper layer 207 that the expiration time has been reached. Upon receiving the notification, the upper layer 207 instructs the reference signal control unit 2051 to stop transmission of SRS. In response to the instruction, the reference signal control unit 2051 stops SRS transmission. Note that the timer control unit 208 may control the wireless reception unit 2031 to start the transmission timer by receiving a physical downlink control channel including information instructing transmission of the reference signal.

FIG. 3 is a diagram showing an example of signaling for A-SRS transmission in the first embodiment of the present invention. First, the base station apparatus 1 transmits a radio resource control signal including A-SRS setting information to the mobile station apparatus 3 (step S101). Further, the base station apparatus 1 transmits a radio resource control signal including information for instructing the mobile station apparatus 3 the A-SRS expiration time (eg, expiration time 30 ms) (step S102). The mobile station apparatus 3 sets various parameters (including expiration time) of A-SRS according to the A-SRS setting information included in the radio resource control signal transmitted from the base station apparatus 1. Furthermore, when the PDCCH including information instructing transmission of A-SRS is transmitted from the base station apparatus 1 to the mobile station apparatus 3 (step S103), the mobile station apparatus 3 counts the transmission time of A-SRS. Is started (step S104), and the A-SRS is transmitted to the base station apparatus 1 until the expiration time set by the transmission timer is reached (step S106) (step S105).

Here, the PDCCH includes a TPC command (Transmission Power Control) for A-SRS transmission. That is, the mobile station apparatus 3 performs A-SRS transmission power control according to the TPC command included in the PDCCH, and transmits the A-SRS to the base station apparatus 1. Here, the information indicating the expiration time of A-SRS may be included in the A-SRS setting information. The parameters set in the SRS setting information include a transmission bandwidth and transmission cycle for A-SRS transmission, a transmission bandwidth and transmission cycle for P-SRS transmission, and the like. At this time, if the mobile station apparatus 3 is instructed by the base station apparatus 1 to perform simultaneous transmission using a plurality of antennas, the mobile station apparatus 3 may transmit A-SRS simultaneously from the plurality of antennas.

The mobile station apparatus 3 receives information for instructing transmission of A-SRS or information for instructing reconfiguration of A-SRS before the expiration time of A-SRS reaches a predetermined expiration time. When the included PDCCH is received, the A-SRS may be transmitted until the expiration time is reached, ignoring the transmission instruction information included in the newly received PDCCH. In addition, the A-SRS transmission is stopped, the transmission timer is restarted, and the A-SRS newly instructed to be transmitted from the base station apparatus 1 is retransmitted to the base station apparatus 1 until a predetermined expiration time is reached. Also good. Here, the information for instructing resetting is information indicating the SRS parameters (for example, transmission bandwidth, transmission cycle, etc.) changed in the base station apparatus 1.

In addition, when the PDCCH transmitted from the base station apparatus 1 includes information instructing the deactivation of A-SRS before reaching the predetermined expiration time, the mobile station apparatus 3 sets the transmission timer. It stops and the transmission of A-SRS is also stopped.

In addition, when the radio resource control signal transmitted from the base station apparatus 1 includes information instructing resetting of A-SRS before the predetermined expiration time is reached, the mobile station apparatus 3 sets a transmission timer. It stops and the transmission of A-SRS is also stopped. Further, when the radio resource control signal transmitted from the base station apparatus 1 includes information instructing that A-SRS transmission is not possible, the mobile station apparatus 3 stops the transmission timer and also transmits the A-SRS. Stop.

If the mobile station apparatus 3 is placed on the same component carrier at the same timing as the P-SRS before the A-SRS reaches the expiration time, the mobile station apparatus 3 drops the P-SRS (without transmitting) and sends the A-SRS. Is transmitted to the base station apparatus 1. Here, if the A-SRS and the P-SRS are arranged at the same timing, as explained using the left diagram of FIG. 6, the base station apparatus 1 instructs the A-SRS transmission and the P-SRS transmission. This means that the mobile station apparatus 3 simultaneously arranges and transmits the A-SRS and the P-SRS in the 14th symbol (shaded area) of the subframe, and indicates that the transmission timing is consistent in symbol units. ing. The mobile station apparatus 3 can determine whether or not the A-SRS and the P-SRS are arranged at the same timing with the 14th symbol. In addition, when A-SRS and P-SRS are allocated to the same timing, the same component carrier, and the same antenna, the mobile station apparatus 3 drops only the P-SRS allocated to the same antenna and transmits A-SRS. Alternatively, the A-SRS may be transmitted by dropping the P-SRSs arranged simultaneously on all the antennas.

Here, the base station apparatus 1 may set the subframe for transmitting the A-SRS for each cell or for each mobile station apparatus 3. Further, the subframe for transmitting A-SRS may include a subframe set for each cell and a subframe set for each mobile station apparatus 3. Further, in a wireless communication system that performs communication using a plurality of component carriers, the base station apparatus 1 may set a subframe for transmitting A-SRS for each component carrier. In a wireless communication system that performs communication using a plurality of antennas such as MIMO (Multiple Input Multiple Output) communication, the base station apparatus 1 may set a subframe for transmitting an A-SRS for each antenna.

In addition, in the mobile station apparatus 3 that communicates with the base station apparatus 1 using a plurality of component carriers, the information that instructs the uplink component carrier that transmits the PUSCH together with the information that instructs the PDCCH to transmit the A-SRS. Is included, the mobile station apparatus 3 transmits the A-SRS using the same uplink component carrier as the uplink component carrier that transmits the PUSCH according to the information indicating the component carrier. That is, the mobile station device 3 that has received the radio resource control signal including the A-SRS setting information and the information indicating the expiration time of the A-SRS from the base station device 1 has the same uplink as the uplink component carrier that transmits the PUSCH. The component carrier is used to transmit A-SRS until the set expiration time is reached. At this time, as parameters for A-SRS transmission, parameters set for the same uplink component carrier as the uplink component carrier transmitting the PUSCH are used. For example, the TPC command included in the PDCCH is applied to PUSCH transmission and A-SRS transmission of the uplink component carrier indicated by the PDCCH.

Here, the component carrier may be arranged in a continuous frequency band or a discontinuous frequency band, and the base station apparatus 1 and the mobile station apparatus 3 may have continuous and / or discontinuous frequencies. By consolidating multiple component carriers that are bands, a wide-band system band (frequency band) is formed, and by using these multiple component carriers in combination, high-speed data communication (information transmission / reception) is realized. can do. Further, the downlink frequency band and the uplink frequency band constituted by the component carriers do not need to have the same bandwidth, and the base station apparatus 1 and the mobile station apparatus 3 have different bandwidths constituted by the component carriers. It is possible to perform communication by using both the downlink frequency band and the uplink frequency band having the same (Asymmetric carrier aggregation).

Only one transmission timer may be set for the mobile station apparatus 3, may be set for each component carrier, or may be set for each antenna.

As described above, in the first embodiment of the present invention, when the information instructing transmission of A-SRS is included in the PDCCH, the mobile station apparatus 3 transmits A-SRS until a predetermined expiration time is reached. can do. Here, the predetermined expiration time is an expiration time of a transmission timer assigned to A-SRS transmission set in advance in the base station apparatus 1.

According to the first embodiment of the present invention, when the information instructing transmission of A-SRS is included in the PDCCH, the uplink channel is transmitted by transmitting the A-SRS until a predetermined expiration time is reached. Measurement accuracy can be improved. Further, since the mobile station apparatus 3 can transmit the A-SRS with a single transmission request from the base station apparatus 1 until a predetermined expiration time is reached, the signaling for making the A-SRS transmission request is reduced. Therefore, efficient A-SRS transmission can be performed. Further, even if the mobile station apparatus 3 erroneously detects the transmission request transmitted from the base station apparatus 1 and erroneously transmits the A-SRS, the ASRS transmission from the mobile station apparatus 3 stops if a predetermined time elapses. Therefore, interference with other mobile station apparatuses 3 can be reduced.

<Second Embodiment>
Next, a second embodiment will be described. In the second embodiment, the base station apparatus 1 transmits to the mobile station apparatus 3 a radio resource control signal including information instructing the expiration time of the A-SRS, and determines whether or not to frequency hop the A-SRS. A radio resource control signal including instructed information is transmitted to the mobile station apparatus 3, and a physical downlink control channel including information instructing transmission of A-SRS is transmitted to the mobile station apparatus 3. The mobile station apparatus 3 sets the A-SRS expiration time according to the information indicating the A-SRS expiration time included in the radio resource control signal, and performs frequency hopping of the A-SRS included in the radio resource control signal. Whether or not to perform frequency hopping according to the information indicating whether or not, and when the physical downlink control channel includes information indicating A-SRS transmission, the base station apparatus until the expiration time is reached 1 to A-SRS.

Since the functional configuration of the device in the second embodiment is the same as that shown in the first embodiment, description thereof is omitted here. In the second embodiment, when the A-SRS transmission request is notified to the mobile station apparatus 3, the channel measurement is performed by transmitting until the A-SRS reaches a predetermined expiration time while performing frequency hopping. The accuracy can be further improved. By applying frequency hopping, it is possible to narrow the transmission bandwidth of SRS transmitted at a time. Further, since the transmission power per subcarrier can be increased and the frequency diversity effect and the interference averaging effect by frequency hopping can be obtained, the channel measurement accuracy can be improved.

FIG. 4 is a diagram illustrating an example of signaling for A-SRS transmission according to the second embodiment of the present invention. First, the base station apparatus 1 transmits a radio resource control signal including A-SRS setting information to the mobile station apparatus 3 (step S201). Further, the base station apparatus 1 transmits a radio resource control signal including information for instructing the mobile station apparatus 3 the A-SRS expiration time (for example, expiration time 30 ms) (step S202). Further, the base station apparatus 1 transmits a radio resource control signal including information instructing whether or not frequency hopping is possible to the mobile station apparatus 3 (step S203). The mobile station apparatus 3 sets various parameters of A-SRS (including expiration time and availability of frequency hopping) according to the A-SRS setting information included in the radio resource control signal transmitted from the base station apparatus 1. Further, when the PDCCH including information instructing transmission of A-SRS is transmitted from the base station apparatus 1 to the mobile station apparatus 3 (step S204), the mobile station apparatus 3 counts the transmission time of A-SRS. Is started (step S205), and A-SRS is transmitted to the base station apparatus 1 until the set expiration time is reached (step S207) (step S206).

Here, if the information indicating whether or not frequency hopping is possible indicates that frequency hopping is possible, the mobile station apparatus 3 performs A-SRS on the base station apparatus 1 until the expiration time is reached while performing frequency hopping of A-SRS. Send to. Here, “frequency hopping is possible in A-SRS” means that the base station apparatus 1 sets the A-SRS transmission bandwidth narrower than the frequency hopping bandwidth. The SRS transmission bandwidth and the frequency hopping bandwidth are compared to determine whether or not to perform frequency hopping. However, information instructing the expiration time of A-SRS and information instructing whether or not frequency hopping is possible may be included in the A-SRS setting information. Here, the parameters set in the SRS setting information are a transmission bandwidth and transmission cycle for A-SRS transmission, a transmission bandwidth and transmission cycle for P-SRS transmission, and the like.

In addition, when the frequency region (resource region) where the A-SRS can be arranged is divided into f1 and f2, the mobile station device 3 transmits to the base station device 1 while switching the frequency region where the A-SRS is arranged between f1 and f2. To do. At this time, if the mobile station apparatus 3 is instructed by the base station apparatus 1 to perform simultaneous transmission using a plurality of antennas, the mobile station apparatus 3 may transmit A-SRS simultaneously from the plurality of antennas.

Since the subframe for transmitting A-SRS is the same as that described in the first embodiment, description thereof is omitted here.

Since the component carrier for transmitting A-SRS is the same as that described in the first embodiment, description thereof is omitted here.

As described above, in the second embodiment of the present invention, when information instructing transmission of A-SRS is included in the PDCCH, A-SRS is transmitted until a predetermined expiration time is reached while performing frequency hopping. be able to.

According to the second embodiment of the present invention, the mobile station apparatus 3 can set frequency hopping only by notifying one SRS transmission request, and performs efficient SRS transmission and frequency hopping. be able to. In the base station apparatus 1, channel measurement accuracy is improved by the effect of frequency hopping, and efficient frequency selection scheduling can be performed. Further, even if the mobile station apparatus 3 erroneously detects the transmission request transmitted from the base station apparatus 1 and erroneously transmits the A-SRS, the A-SRS transmission from the mobile station apparatus 3 is not performed if a predetermined time elapses. Since it stops, the interference with the other mobile station apparatus 3 can be reduced.

<Third Embodiment>
Next, a third embodiment will be described. In the third embodiment, the base station device 1 transmits to the mobile station device 3 a radio resource control signal including information for instructing the expiration time of A-SRS, and indicates information for performing antenna selection. Is transmitted to the mobile station apparatus 3, and a physical downlink control channel including information instructing transmission of A-SRS is transmitted to the mobile station apparatus 3. The mobile station apparatus 3 sets the A-SRS expiration time according to the information indicating the A-SRS expiration time included in the radio resource control signal, and determines whether or not to perform the antenna selection included in the radio resource control signal. Whether to perform antenna selection is set according to the instructed information, and if the physical downlink control channel includes information instructing transmission of A-SRS, the base station apparatus 1 is informed of A- until the expiration time is reached. Send SRS. Here, the antenna selection means that when a plurality of transmission antennas are set in the mobile station apparatus 3, the base station apparatus 1 designates in advance an antenna for transmitting an uplink signal to the mobile station apparatus 3, It is possible to instruct the transmission antenna to be switched.

Since the functional configuration of the device in the third embodiment is the same as that shown in the first embodiment, the description thereof is omitted here. In the third embodiment, transmission control in the case of transmitting A-SRS while switching a plurality of antennas will be described.

FIG. 5 is a diagram showing an example of signaling for A-SRS transmission in the third embodiment of the present invention. First, the base station apparatus 1 transmits a radio resource control signal including A-SRS setting information to the mobile station apparatus 3 (step S301). Further, the base station apparatus 1 transmits a radio resource control signal including information for instructing the mobile station apparatus 3 the A-SRS expiration time (eg, expiration time 30 ms) (step S302). In addition, the base station apparatus 1 transmits a radio resource control signal including information instructing whether the antenna can be selected to the mobile station apparatus 3 (step S303). The mobile station apparatus 3 sets various parameters of A-SRS (including expiration time and availability of antenna selection) according to the A-SRS setting information included in the radio resource control signal transmitted from the base station apparatus 1. Furthermore, when the PDCCH including information instructing transmission of A-SRS is transmitted from the base station apparatus 1 to the mobile station apparatus 3 (step S304), the mobile station apparatus 3 counts the transmission time of A-SRS. The transmission timer is started (step S305), and A-SRS is transmitted to the base station apparatus 1 until the expiration time set by the transmission timer is reached (step S307) (step S306).

Here, when the information indicating whether the antenna can be selected is instructed that the antenna can be selected, the mobile station apparatus 3 transmits the A-SRS to the base station apparatus 1 until the expiration time is reached while performing the antenna selection. However, the information indicating the expiration time of A-SRS and the information indicating whether antenna selection is possible may be included in the A-SRS setting information. Here, the parameters set in the SRS setting information are a transmission bandwidth, a transmission cycle, and the like. Further, when the antenna of the mobile station apparatus 3 that can select the antenna is ant # 1, ant # 2, the mobile station apparatus 3 transmits the A-SRS to the base station apparatus 1 while switching between ant # 1 and ant # 2. . At this time, if the mobile station apparatus 3 is instructed by the base station apparatus 1 to perform simultaneous transmission using a plurality of antennas, the mobile station apparatus 3 may transmit A-SRS simultaneously from the plurality of antennas.

As described above, in the third embodiment of the present invention, when the PDCCH includes information instructing transmission of A-SRS, the mobile station device 3 performs A-SRS while performing antenna selection (switching). Can be transmitted until a predetermined expiration time is reached.

According to the third embodiment of the present invention, the mobile station apparatus 3 can transmit A-SRS from a plurality of antennas by performing antenna selection, and the base station apparatus 1 transmits the received A-SRS. Since channel measurement can be performed for each antenna by using, efficient channel measurement using a plurality of antennas can be performed. In addition, the base station apparatus 1 can select a transmission antenna with a better communication status with respect to the mobile station apparatus 3, or can quickly apply to a MIMO (Multiple Input Input Multiple Output) communication that requires transmission using a plurality of antennas. Can be. Further, even if the mobile station apparatus 3 erroneously detects the transmission request transmitted from the base station apparatus 1 and erroneously transmits the A-SRS, the A-SRS transmission from the mobile station apparatus 3 is not performed if a predetermined time elapses. Since it stops, the interference with the other mobile station apparatus 3 can be reduced. Note that the first to third embodiments may be used in combination.

Note that the first to third embodiments may be applied to a P-SRS for which transmission is instructed using a radio resource control signal.

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

Note that the “computer system” here includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In such a case, a volatile memory inside a computer system serving as a server or a client may be included and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

In addition, part or all of the mobile station device 3 and the base station device 1 in the above-described embodiment may be realized as an LSI (Large Scale Integration) that is typically an integrated circuit. Each functional block of the mobile station device 3 and the base station device 1 may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

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

DESCRIPTION OF SYMBOLS 1 Base station apparatus 3 Mobile station apparatus 101 Transmitter (base station side transmitter)
103 Receiver (base station side receiver)
105 Scheduling unit 107 Upper layer 109 Antenna 201 Transmitter (mobile station side transmitter)
203 Receiving unit (receiving unit on the mobile station side)
205 Scheduling unit 206 Reference signal generation unit 207 Upper layer 208 Timer control unit 209 Antenna 1011 Data control unit 1013 Modulation unit 1015 Radio transmission unit 1031 Radio reception unit 1033 Demodulation unit 1035 Data extraction unit 1071 Radio resource control unit 2011 Data control unit 2013 Modulation Unit 2015 wireless transmission unit 2031 wireless reception unit 2033 demodulation unit 2035 data extraction unit 2051 reference signal control unit 2071 radio resource control unit

Claims

A wireless communication system comprising a base station device and a mobile station device,
The base station device
A radio resource control signal including information indicating an expiration time of a reference signal for channel measurement is transmitted to the mobile station apparatus, and a physical downlink control channel including information indicating the transmission of the reference signal is transmitted to the mobile station To the device,
The mobile station device
A wireless communication system, wherein when the physical downlink control channel includes information instructing transmission of the reference signal, the reference signal is transmitted to the base station apparatus until the expiration time is reached.
The base station device transmits a radio resource control signal including information indicating whether to perform frequency hopping of the reference signal to the mobile station device;
The mobile station apparatus transmits the reference signal to the base station apparatus while performing frequency hopping until the expiration time is reached in accordance with information indicating frequency hopping of the reference signal included in the radio resource control signal. The wireless communication system according to claim 1.
The base station apparatus transmits a radio resource control signal including information instructing whether or not the mobile station apparatus performs antenna selection to the mobile station apparatus,
The mobile station apparatus transmits the reference signal to the base station apparatus while performing antenna selection until the expiration time is reached according to information instructing antenna selection of the mobile station apparatus included in the radio resource control signal. The wireless communication system according to claim 1, wherein the wireless communication system is a wireless communication system.
The radio communication system according to any one of claims 1 to 3, wherein in the mobile station apparatus, a subframe in which the reference signal is transmitted is set for each cell.
The radio communication system according to any one of claims 1 to 3, wherein in the mobile station apparatus, a subframe in which the reference signal is transmitted is set for each mobile station apparatus.
In the mobile station apparatus, a subframe in which the reference signal set for each mobile station apparatus is transmitted is composed of subframes in which the reference signal set for each cell can be transmitted. The wireless communication system according to any one of claims 1 to 3, wherein the wireless communication system is characterized.
A base station device that communicates with a mobile station device,
Means for transmitting a radio resource control signal including information indicating an expiration time of a reference signal for channel measurement to the mobile station device;
Means for transmitting a physical downlink control channel including information instructing transmission of the reference signal to the mobile station apparatus.
The said base station apparatus is provided with a means to transmit the radio | wireless resource control signal containing the information which instruct | indicates whether the frequency hopping of the said reference signal is performed to the said mobile station apparatus. Base station device.
The said base station apparatus is provided with the means to transmit the radio | wireless resource control signal containing the information which instruct | indicates whether the said mobile station apparatus performs antenna selection to the said mobile station apparatus. Item 9. The base station apparatus according to Item 8.
A mobile station device that communicates with a base station device,
When the physical downlink control channel includes information instructing transmission of a reference signal for channel measurement, the physical downlink control channel includes means for transmitting the reference signal to the base station apparatus until an expiration time is reached. Mobile station device.
The mobile station device
In accordance with information instructing frequency hopping included in the radio resource control signal transmitted by the base station apparatus, it comprises means for transmitting the reference signal to the base station apparatus while performing frequency hopping until the expiration time is reached. The mobile station apparatus according to claim 10.
The mobile station device
Means for transmitting the reference signal to the base station apparatus while performing antenna selection until the expiration time is reached according to information indicating antenna selection included in the radio resource control signal transmitted by the base station apparatus. The mobile station apparatus according to claim 10 or 11.
A wireless communication method of a wireless communication system comprising a base station device and a mobile station device,
The base station device
Transmitting a radio resource control signal including information indicating an expiration time of a reference signal for channel measurement to the mobile station device;
Transmitting at least a physical downlink control channel including information instructing transmission of the reference signal to the mobile station apparatus,
The mobile station device
And a step of transmitting the reference signal to the base station apparatus until the expiration time is reached when the physical downlink control channel includes information instructing transmission of the reference signal. A wireless communication method.
The base station apparatus includes at least a step of transmitting a radio resource control signal including information indicating whether to perform frequency hopping of the reference signal to the mobile station apparatus;
The mobile station apparatus includes at least a step of transmitting the reference signal to the base station apparatus while performing frequency hopping until the expiration time is reached according to the information indicating the frequency hopping included in the radio resource control signal. The wireless communication method according to claim 13, wherein:
The base station apparatus includes at least a step of transmitting a radio resource control signal including information indicating whether the mobile station apparatus performs antenna selection to the mobile station apparatus;
The mobile station apparatus has at least a step of transmitting the reference signal to the base station apparatus while performing antenna selection until the expiration time is reached according to the information instructing the antenna selection included in the radio resource control signal. 15. The wireless communication method according to claim 13, wherein the wireless communication method is performed.