US20140119326A1 - Wireless communication system, base station, mobile station, base station control program, and mobile station control program - Google Patents
Wireless communication system, base station, mobile station, base station control program, and mobile station control program Download PDFInfo
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- US20140119326A1 US20140119326A1 US14/147,398 US201414147398A US2014119326A1 US 20140119326 A1 US20140119326 A1 US 20140119326A1 US 201414147398 A US201414147398 A US 201414147398A US 2014119326 A1 US2014119326 A1 US 2014119326A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
- H04B7/0608—Antenna selection according to transmission parameters
- H04B7/061—Antenna selection according to transmission parameters using feedback from receiving side
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1864—ARQ related signaling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
- H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/48—TPC being performed in particular situations during retransmission after error or non-acknowledgment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/365—Power headroom reporting
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Abstract
A base station which includes a transmission section that is configured to transmit, to a mobile station, first information indicating first control information for controlling a number of transmission antennas of the mobile station for retransmitting transmission data with at least second information indicating a retransmission request and third information indicating second control information for controlling retransmission power for retransmitting the transmission data. The base station also includes a radio section configured to receive, from the mobile station, the transmission data.
Description
- This application is a Divisional of co-pending application Ser. No. 13/377,474 filed on Dec. 13, 2011, and for which priority is claimed under 35 U.S.C. §120, application Ser. No. 13/377,474 is the national phase of PCT International Application No. PCT/JP2010/057260 filed on Apr. 23, 2010 under 35 U.S.C. §371, which claims the benefit of priority of JP2009-141141 filed Jun. 12, 2009. The entire contents of each of the above-identified applications are hereby incorporated by reference.
- The present invention relates to a wireless communication system, a base station, a mobile station, a base station control program, and a mobile station control program, each of which performs retransmission processing in wireless communication.
- The LTE (Long Term Evolution) system, which is the 3.9th generation wireless communication system for a mobile phone, employs HARQ (Hybrid Automatic Repeat Request) which is a retransmission control method of performing error detection of a transmission packet between a base station and a mobile station and transmitting a packet having caused an error again. This retransmission control checks a packet error by using CRC (Cyclic Redundancy Check) added to the transmission packet and transmits NACK (Negative Acknowledgement) which is a retransmission request signal when the received packet has not been able to be decoded correctly. Furthermore, ACK (Acknowledgement) which is a transmission acknowledgement signal is transmitted when the transmitted packet has been received correctly (refer to Non-patent document 1).
- The retransmission control includes Non-adaptive ARQ and Adaptive ARQ. While Non-adaptive ARQ transmits data in retransmission by the same transmission method as that at the time of initial transmission, Adaptive ARQ transmits retransmission data different from that in the initial transmission by changing a parameter such as a modulation scheme, a coding rate, a puncture pattern, a frequency band width to be used, transmission power (refer to Patent document 1). Furthermore, there is proposed a method of using a plurality of antennas at the time of the retransmission, such as STTD (Space Time Transmit Diversity) and MIMO (Multiple-Input Multiple-Output) which are transmission diversity methods (refer to Patent document 1).
- Patent document 1: Japanese Patent Application Laid-Open Publication No. 2007-214824
- Patent document 2: Pamphlet of International Publication No.
- Non-patent document 1: 3GPP TS 36.211 (V8.6.0) “Evolved Universal Terrestrial Radio Access (E-UTRA) Physical Channels and Modulation”
- However, the retransmission control by Adaptive ARQ has not been examined in consideration of a PH (Power Headroom) indicating a transmission power headroom, in a wireless communication system which enables access methods having respective peak powers different from one another to be used in an uplink, such as Clustered DFT-S-OFDM (Dynamic Spectrum Control (DSC), also called DFT-S-OFDM with SDC (Spectrum Division Control)) and DFT-S-OFDM (Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing, also called SC-FDMA). Accordingly, in the retransmission using an access method requiring a high peak power, there is a problem in which a user without having room for PH such as a cell-edge user cannot further increase the transmission power and a base station cannot receive data correctly.
- The present invention has been achieved in view of such a situation, and aims at providing a wireless communication system, a base station, a mobile station, a base station control program, and a mobile station control program, which control an access method, a transmission power, an antenna to be used, and the number of antennas in consideration of the PH indicating a transmission power headroom.
- (1) For achieving the above object, the present invention employs the following measures. That is, a wireless communication system of the present invention is configured with a base station and a mobile station and performs wireless communication by selecting any one of a plurality of access methods having respective peak powers different from one another, wherein, when retransmission occurs in the access method used by the mobile station, the base station selects an access method having a lower peak power than the access method and also instructs the mobile station to perform the retransmission by increasing transmission power.
- In this manner, when the retransmission occurs in the access method used by the mobile station, the base station selects an access method having a lower peak power than the access method and also instructs the mobile station to perform the retransmission by increasing the transmission power, and thus the mobile station can avoid a transmission power shortage and perform the retransmission with a sufficient transmission power. This results in an improvement of a cell throughput.
- (2) A wireless communication system of the present invention which is configured with a base station and a mobile station and in which the mobile station performs data transmission to the base station by allocating a transmission signal converted into a frequency signal to contiguous frequency bands or non-contiguous frequency bands divided into a predetermined number, wherein, when retransmission occurs in the data transmission the mobile station has performed by allocating the transmission signal converted into the frequency signal to the non-contiguous frequency bands, the base station determines a transmission power headroom of the mobile station in the allocation of the transmission signal to the non-contiguous frequency bands, and, if a result of the determination shows that there is not a transmission power headroom, the base station instructs the mobile station to allocate the transmission signal to the contiguous frequency bands and to perform the retransmission by increasing transmission power.
- In this manner, when the retransmission occurs in the data transmission the mobile station has performed by allocating the transmission signal converted into the frequency signal to the non-contiguous frequency bands, the base station determines a transmission power headroom of the mobile station in the allocation of the transmission signal to the non-contiguous frequency bands, and, if a result of the determination shows that there is not a transmission power headroom, instructs the mobile station to allocate the transmission signal to the contiguous frequency bands and to perform the retransmission by increasing the transmission power, and thus it is possible to suppress the increase of the retransmission due to a shortage of the transmission power in the mobile station and to improve the cell throughput.
- (3) Furthermore, in the wireless communication system of the present invention, the mobile station performs the retransmission by increasing the transmission power by an amount corresponding to a transmission power headroom generated by the allocation of the transmission signal to the contiguous frequency bands.
- In this manner, the mobile station performs the retransmission by increasing the transmission power by an amount corresponding to a transmission power headroom generated by the allocation of the transmission signal to the contiguous frequency bands, and thus the mobile station can avoid a transmission power shortage and perform the retransmission with a sufficient transmission power. This results in the improvement of the cell throughput.
- (4) Furthermore, in the wireless communication system of the present invention, the mobile station allocates the transmission signal to the contiguous frequency bands and also performs the retransmission by increasing the transmission power by a predetermined amount.
- In this manner, the mobile station allocates the transmission signal to the contiguous frequency bands and also performs the retransmission by increasing the transmission power by a predetermined amount, and thus the base station needs not notify the mobile station of control information of the transmission power at the time of the retransmission and the mobile station can avoid a transmission power shortage and perform the retransmission with a sufficient transmission power. This results in the improvement of the cell throughput.
- (5) Furthermore, in the wireless communication system of the present invention, the mobile station has a plurality of antennas and the base station instructs the mobile station to allocate the transmission signal to the contiguous frequency bands and to perform the retransmission by using an antenna having a high channel gain among the plurality of antennas included in the mobile station and by increasing the transmission power.
- In this manner, the mobile station includes a plurality of antennas and the base station instructs the mobile station to allocate the transmission signal to the contiguous frequency bands and to perform the retransmission by using an antenna having a high channel gain among the plurality of antennas included in the mobile station and by increasing the transmission power, and thus the base station can suppress the increase of the retransmission due to a shortage of the transmission power in the mobile station and improve the cell throughput by an antenna diversity effect.
- (6) Furthermore, in the wireless communication system of the present invention, the base station determines an increase amount of the transmission power based on a channel gain of the antenna to be used at the time of the retransmission.
- In this manner, the base station determines an increase amount of the transmission power based on a channel gain of an antenna used at the time of the retransmission, and thus the base station can set the transmission power flexibly in accordance with the channel gain of the antenna used in the mobile station.
- (7) Furthermore, in the wireless communication system, the mobile station has a plurality of antennas, and the base station determines the number of antennas to be used at the time of the retransmission among the plurality of antennas included in the mobile station and instructs the mobile station to allocate the transmission signal to the contiguous frequency bands and to perform the retransmission by using a determined number of antennas and by increasing the transmission power.
- In this manner, the mobile station has a plurality of antennas and the base station determines the number of antennas to be used at the time of the retransmission among the plurality of antennas included in the mobile station and instructs the mobile station to allocate the transmission signal to the contiguous frequency bands and to perform the retransmission by using a determined number of antennas and by increasing the transmission power, and thus the base station can suppress the increase of the retransmission due to a shortage of the transmission power in the mobile station and improve the cell throughput by the transmission diversity effect.
- (8) Furthermore, in the wireless communication system of the present invention, the mobile station performs the retransmission by increasing the transmission power larger than a total power at the time of initial transmission by an amount corresponding to a transmission power headroom generated by the allocation of the transmission signal to the contiguous frequency bands and by using a determined number of antennas.
- In this manner, the mobile station performs the retransmission by increasing the transmission power larger than a total power at the time of the initial transmission by an amount corresponding to a transmission power headroom generated by the allocation of the transmission signal to the contiguous frequency bands and by using a determined number of antennas, and thus the mobile station can suppress the increase of the retransmission due to a shortage of the transmission power.
- (9) A base station of the present invention is applied to a wireless communication system which is configured with the base station and a mobile station and in which the mobile station performs data transmission to the base station by allocating a transmission signal converted into a frequency signal to contiguous frequency bands or non-contiguous frequency bands divided into a predetermined number, wherein, when retransmission occurs in the data transmission the mobile station has performed by allocating the transmission signal converted into the frequency signal to the non-contiguous frequency bands, the base station determines a transmission power headroom of the mobile station in the allocation of the transmission signal to the non-contiguous frequency bands, and, if a result of the determination shows that there is not a transmission power headroom, the base station instructs the mobile station to allocate the transmission signal to the contiguous frequency bands and to perform the retransmission by increasing transmission power.
- In this manner, when the retransmission occurs in the data transmission the mobile station has performed by allocating the transmission signal converted into the frequency signal to the non-contiguous frequency bands, the base station determines a transmission power headroom of the mobile station in the allocation of the transmission signal to the non-contiguous frequency bands, and, if a result of the determination shows that there is not a transmission power headroom, the base station instructs the mobile station to allocate the transmission signal to the contiguous frequency bands and to perform the retransmission by increasing the transmission power, and thus the base station can suppress the increase of the retransmission due to a shortage of the transmission power in the mobile station and can improve the cell throughput.
- (10) A mobile station of the present invention is applied to a wireless communication system which is configured with a base station and the mobile station and in which the mobile station performs data transmission to the base station by allocating a transmission signal converted into a frequency signal to contiguous frequency bands or non-contiguous frequency bands divided into a predetermined number, wherein the mobile station performs retransmission to the base station by increasing transmission power by an amount corresponding to a transmission power headroom generated by the allocation of the transmission signal to the contiguous frequency bands.
- In this manner, the mobile station performs the retransmission to the base station by increasing the transmission power by an amount corresponding to a transmission power headroom generated by the allocation of the transmission signal to the contiguous frequency bands, and thus the mobile station can avoid a shortage of the transmission power and perform the retransmission with a sufficient transmission power. This results in the improvement of the cell throughput.
- (11) A base station control program of the present invention is applied to a wireless communication system which is configured with a base station and a mobile station and in which the mobile station performs data transmission to the base station by allocating a transmission signal converted into a frequency signal to contiguous frequency bands or non-contiguous frequency bands divided into a predetermined number, wherein, when retransmission occurs in the data transmission the mobile station has performed by allocating the transmission signal converted into the frequency signal to the non-contiguous frequency bands, the base station control program converts a series of processing steps into a command in a manner a computer can read and execute the command, the series of processing steps including processing of determining a transmission power headroom of the mobile station in the allocation of the transmission signal to the non-contiguous frequency bands, and, if a result of the determination shows that there is not a transmission power headroom, includes processing of instructing the mobile station to allocate the transmission signal to the contiguous frequency bands and to perform the retransmission by increasing transmission power.
- In this manner, when the retransmission occurs in the data transmission the mobile station has performed by allocating the transmission signal converted into the frequency signal to the non-contiguous frequency bands, the series of processing, which includes the processing of determining a transmission power headroom of the mobile station in the allocation of the transmission signal to the non-contiguous frequency bands, and, if a result of the determination shows that there is not a transmission power headroom, the processing of instructing the mobile station to allocate the transmission signal to contiguous frequency bands and to perform the retransmission by increasing the transmission power, is converted into a command in a manner a computer can read and execute the command, and thus it is possible to suppress the increase of the retransmission due to a shortage of the transmission power in the mobile station and to improve the cell throughput.
- (12) A mobile station control program of the present invention is applied to a wireless communication system which is configured with a base station and a mobile station and in which the mobile station performs data transmission to the base station by allocating a transmission signal converted into a frequency signal to contiguous frequency bands or non-contiguous frequency bands divided into a predetermined number, wherein the mobile station program converts processing into a command in a manner a computer can read and execute the command, the processing performing retransmission to the base station by increasing transmission power by an amount corresponding to a transmission power headroom generated by the allocation of the transmission signal to the contiguous frequency bands.
- In this manner, the processing, which performs the retransmission to the base station by increasing transmission power by an amount corresponding to a transmission power headroom generated by the allocation of the transmission signal to the contiguous frequency bands, is converted into a command in a manner a computer can read and execute the command, and thus it is possible to suppress the increase of the retransmission due to a shortage of the transmission power in the mobile station and to improve the cell throughput.
- By applying the present invention, it is possible to avoid a situation in which transmission power runs short in retransmission and data cannot be transmitted correctly, even in the case of a user present at a cell edge, and it is possible to improve cell throughput.
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FIG. 1 is a block diagram illustrating an outline configuration example of a mobile station according to a first embodiment. -
FIG. 2 is a block diagram illustrating an outline configuration example of a base station according to an embodiment of the present invention. -
FIG. 3 is a diagram illustrating retransmission processing of a first embodiment. -
FIG. 4 is a diagram illustrating transmission power when a mobile station transmits data using non-contiguous frequency bands. -
FIG. 5 is a diagram illustrating transmission power when a mobile station transmits data by increasing the transmission power through the use of contiguous frequency bands. -
FIG. 6 is a flowchart of a determination method for control information abase station transmits at the time of a retransmission request of a first embodiment. -
FIG. 7 is a block diagram illustrating an outline configuration example of a mobile station according to a second embodiment. -
FIG. 8 is a diagram illustrating retransmission processing of a second embodiment. -
FIG. 9 is a block diagram illustrating an outline configuration example of a mobile station according to a third embodiment. -
FIG. 10 is a diagram illustrating retransmission processing of a third embodiment. - The standardization of the LTE system has been almost completed and recently the standardization of LTE-A (also called LTE-Advanced, IMT-A, or the like), which is the fourth generation wireless communication system developed further from the LTE system, has been started.
- An uplink (communication from a mobile station to a base station) in LTE-A is required to have a higher peak data rate than that in LTE and to have an improved spectrum efficiency. Accordingly, an improvement of a throughput by introducing a new access method and an improvement of the peak data rate by using a multiple antenna technique are being studied.
- As an access method in the LTE-A system uplink, there is proposed Clustered DFT-S-OFDM which places emphasis on backward compatibility, supports DFT-S-OFDM, and further can improve the throughput. Clustered DFT-S-OFDM is an access method which selects a frequency having a high channel gain from an available band and allocates spectranon-contiguously, and thus Clustered DFT-S-OFDM can obtain a high frequency diversity effect, while requiring a higher peak power than DFT-S-OFDM, and can improve the cell throughput.
- Furthermore, while an uplink in LTE system does not use a plurality of antennas at the same time, in the LTE-A system, there is being examined a method of improving the spectrum efficiency and coverage by using MIMO (Multiple-Input Multiple-Output) multiple transmission and transmission diversity which use a plurality of transmission antennas at the same time.
- Hereinafter, embodiments of the present invention will be explained with reference to the drawings. While, in the following embodiments, explanation will be made only for a case in which single carrier transmissions having respective peak powers different from one another are available in a mobile station of a transmission apparatus, substantially the same retransmission method which is based on a transmission power headroom is included in the present invention also for a case in which single carrier transmission and multi-carrier transmission which have respective peak powers different from each other are available.
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FIG. 1 is a block diagram illustrating an outline configuration example of a mobile station according to a first embodiment. The mobile station is provided with abuffer section 100, acoding section 101, amodulation section 102, aDFT section 103, a transmissiondata allocation section 104, anIDFT section 105, a referencesignal generation section 106, a referencesignal insertion section 107, aCP insertion section 108, aradio section 109, aPA section 110, atransmission antenna 111, a transmission powerheadroom calculation section 112, a controlinformation transmission section 113, a control informationreception processing section 114, areception antenna 115, and aretransmission control section 116. - The mobile station receives control information including frequency allocation information, notification of which has been received from abase station of a reception apparatus and, after having performed data transmission according to the frequency allocation information, receives a transmission acknowledgement signal, notification of which is to be received from the base station with the
reception antenna 115. This transmission acknowledgement signal shows whether or not the base station has been able to decode data transmitted from the mobile station correctly, and exhibits ACK when the base station has been able to decode the data correctly and exhibits NACK when the base station has not been able to decode the data correctly. When a transmission method different from that of initial data transmission is to be used at the time of retransmission, the mobile station also receives control information such as a frequency allocation method and a transmission power. A signal received by thereception antenna 115 is input to the control informationreception processing section 114. - The control information
reception processing section 114 obtains the transmission acknowledgement signal and the frequency allocation information from the reception signal. The obtained transmission acknowledgement signal is input to theretransmission control section 116, and, in contrast, the frequency allocation information of the control information is input to the transmissiondata allocation section 104 and the transmission power information is input to the PA (Power Amplifier)section 110. - The
retransmission control section 116 inputs transmission data, which has been input to thebuffer section 100, to thecoding section 101 when the input transmission acknowledgement signal exhibits ACK, and inputs transmission data, which is stored in the buffer and which the base station has not been able to receive correctly, to thecoding section 101 when the input transmission acknowledgement signal exhibits NACK. - The transmission data input to the
coding section 101 is converted into code bits provided with a error correcting code and is modulated into a modulation symbol such as QPSK (Quadrature Phase Shift Keying) and 16 QAM (16 Quadrature Amplitude Modulation) in themodulation section 102. The modulation symbols are converted into a frequency domain signal in theDFT section 103, and the transmissiondata allocation section 104 allocates the frequency signal based on the frequency allocation information, notification of which has been received from the base station. The IDFT (Inverse Discrete Fourier Transform)section 105 converts the frequency signals into a time domain signal. A signal generated in the referencesignal generation section 106 is inserted in the referencesignal insertion section 107. While the reference signal is inserted into the time domain signal in the present embodiment, the reference signal may be frequency-multiplied before the frequency signal is converted into the time domain signal in theIDFT section 105. The CP (Cyclic Prefix)insertion section 108 adds a CP to the time signal, and the time signal is up-converted into a radio frequency by theradio section 109 and transmitted from thetransmission antenna 111 after having been amplified in thePA section 110 so as to have a transmission power, notification of which has been received from the base station. - Furthermore, a transmission power headroom calculated by the transmission power
headroom calculation section 112 is transmitted periodically to the base station via the controlinformation transmission section 113. - While, in the present embodiment, the retransmission is configured to start from the coding of the transmission data, the coding may not be performed again and the coded data may be stored, when a coding method, a coding rate, a constraint length, a puncture pattern, and the like to be applied are not changed. Similarly, when a modulation scheme to be applied is not changed in the modulation section, the frequency domain signal obtained by DFT may be stored.
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FIG. 2 is a block diagram illustrating an outline example of a base station according to an embodiment of the present invention. The base station is provided with areception antenna 201, aradio section 202, aCP removal section 203, a referencesignal separation section 204, aDFT section 205, a transmissiondata extraction section 206, achannel compensation section 207, anIDFT section 208, ademodulation section 209, adecoding section 210, a cyclicredundancy check section 211, achannel estimation section 213, a frequencyallocation decision section 214, controlinformation generation section 215, a controlinformation transmission section 216, abuffer section 217, a transmission acknowledgementsignal transmission section 218, atransmission antenna 219, and a controlinformation buffer section 220. - The
reception antenna 201 receives data or control information transmitted from the mobile station. When the data is received, theradio section 202 down-converts a signal received by thereception antenna 201 into a base band frequency, theCP removal section 203 removes the cyclic prefix, and the referencesignal separation section 204 separates the reference signal. The separated reference signal is input to thechannel estimation section 213 and a frequency response of a channel is estimated from the reference signal. The estimated channel information is input to thechannel compensation section 207 and the frequencyallocation decision section 214. - In contrast, the signal (which has been) separated from the reference signal is converted into a frequency domain signal by the
DFT section 205 and the transmissiondata extraction section 206 extracts the transmitted data from frequencies in which the data is allocated, based on the frequency allocation information stored in thebuffer section 217. Thechannel compensation section 207 performs processing of compensating a radio channel distortion such as multiplication of a minimum mean square error (MMSE) weight through the use of the frequency response estimated by thechannel estimation section 213, and theIDFT section 208 converts the data into a time domain signal. The obtained time domain signal is broken down from the modulation symbol into reception code bits by thedemodulation section 209 and is subjected to error correction decoding by thedecoding section 210. The cyclicredundancy check section 211 determines whether or not the decoded data has been received correctly by using the CRC added to the transmission data. - Furthermore, when the control information is received, the control information can be obtained by the same reception processing, and when a PH is received as the control information, the PH is stored in the control
information buffer section 220 to be used for retransmission control. - When the cyclic
redundancy check section 211 has determined that the reception data is correct, ACK is transmitted via the transmission acknowledgementsignal transmission section 218. When an error has been detected in the reception data, NACK is transmitted via the transmission acknowledgementsignal transmission section 218. Furthermore, the PH information stored in the controlinformation buffer section 220 is input to the frequencyallocation decision section 214. - The frequency
allocation decision section 214 determines frequency allocation based on the input channel information and the control information such as the PH, and inputs the frequency allocation to thebuffer section 217 and the controlinformation generation section 215. For the frequency allocation, it is determined based on the PH indicating a transmission power headroom whether the contiguous allocation or the non-contiguous allocation is to be used, and when there is not a transmission power headroom, the contiguous frequency allocation is used. Furthermore, frequency bands to be allocated are determined based on the channel information estimated in thechannel estimation section 213. The controlinformation generation section 215 generates the control information and the control information is transmitted from thetransmission antenna 219 via the controlinformation transmission section 216. - A first embodiment is related to a retransmission method in which the mobile station performs the data transmission by using Clustered DFT-S-OFDM and the base station detects an error from a decoding result of the reception data by the CRC. There will be explained an example of switching to DFT-S-OFDM when there is not a transmission power headroom and an example of increasing the transmission power by an amount of margin for back-off, generated by the switching. While the number of the
transmission antennas 111 of the mobile station is set to be one, the present embodiment can be applied when oneantenna 111 is used even if the mobile station includes a plurality ofantennas 111. -
FIG. 3 is a diagram illustrating retransmission processing of the first embodiment. Themobile station 301 periodically notifies thebase station 303 of a PH as the control information (Step S1). In contrast, thebase station 303 determines the transmission power of themobile station 301 in consideration of interference with amobile station 301 within the same cell as that of the PH, notification of which has been received from themobile station 301, and notifies themobile station 301 thereof (Step S2). -
FIG. 4 is a diagram illustrating transmission power when themobile station 301 transmits data by using non-contiguous frequency bands. InFIG. 3 , when themobile station 301 performs data transmission, thebase station 303 transmits control information, which includes the information of allocating non-contiguous frequency, to the mobile station 301 (Step S3). Themobile station 301 transmits data by using the non-contiguous frequency bands as shown inFIG. 4 based on to the received control information (Step S4). -
FIG. 5 is a diagram illustrating the transmission power when themobile station 301 transmits data by increasing the transmission power through the use of the contiguous frequency bands. InFIG. 3 , when thebase station 303 has detected an error by the CRC in the data obtained by the decoding of the reception signal, thebase station 303 transmits NACK which is a retransmission request (Step S5). Furthermore, when there is a transmission power headroom smaller than the PH, of which themobile station 301 notifies thebase station 303 periodically, thebase station 303 determines the allocation of the contiguous frequency bands which is a transmission method having a lower peak power. By the allocation of the contiguous bands, a required back-off amount becomes small, the transmission power headroom becomes sufficient, and thus the increase in the transmission power becomes possible as shown inFIG. 5 . - In
FIG. 3 , thebase station 303 notifies themobile station 301 of the frequency allocation information and the transmission power as control information in Step S5. Themobile station 301 performs the retransmission based on the received control information (Step S6), and thebase station 303 transmits ACK in return if the base station has been able to receive the data correctly (Step S7). -
FIG. 6 is a flowchart of a determination method for control information thebase station 303 transmits at the time of the retransmission request of the first embodiment. Thebase station 303 receives the data transmitted through the use of the non-contiguous frequency (Step S101). Thebase station 303 decodes the received data and determines whether or not the decoding has been performed correctly by detecting an error by the CRC (Step S102). When the decoding has succeeded, thebase station 303 notifies themobile station 301 of ACK as the acknowledgement signal (Step S106). - When the decoding has failed, the
base station 303 confirms whether or not there is a transmission power headroom, based on the PH, notification of which has been received from the mobile station 301 (Step S103). When there is a transmission power headroom, thebase station 303 generates the control information of allocating the non-contiguous frequency (Step S105). The allocation of the non-contiguous frequency may be the same as that in the initial data transmission or may be changed. Furthermore, since there is a transmission power headroom, thebase station 303 may transmit the control information of increasing the transmission power, to themobile station 301. When there is not a transmission power headroom, thebase station 303 generates the control information of the contiguous frequency allocation and the transmission power (Step S104). Thebase station 303 notifies themobile station 301 of the generated control information and NACK which is the transmission acknowledgement signal (Step S107). - By applying the present embodiment, it is possible to suppress the increase of the retransmission due to a shortage of the transmission power and to improve the cell throughput, since the
base station 303 changes the transmission method of the retransmission in consideration of a transmission power headroom when thebase station 303 has detected an error in the transmission of the non-contiguous frequency bands performed by themobile station 301 through the use of one transmission antenna. While, in the present embodiment, the allocation is changed to the contiguous frequency allocation when there is not a transmission power headroom and the contiguous frequency allocation is used when there is a transmission power headroom, multiple carriers may be used when there is a transmission power headroom and the retransmission may be performed by a single carrier when there is not a transmission power headroom. Furthermore, while thebase station 303 is configured to notify themobile station 301 of the control information including the change to the contiguous frequency allocation and the transmission power at the time of the retransmission, a predetermined value may be used as the transmission power at the time of the retransmission, if the transmission power is smaller than an increased amount of the transmission power headroom. - In a second embodiment, there will be explained an example in which, when the
mobile station 301 performs data transmission by Clustered DFT-S-OFDM, themobile station 301 changes the bands to be allocated in consideration of a transmission power headroom, increases the transmission power by margin for the back-off, and switches to atransmission antenna 605 having a higher channel gain, at the time of the retransmission. While in the present invention, the number of thetransmission antennas 605 is set to be one in the initial transmission, a case in which the plurality oftransmission antennas 605 is used can also be applied. -
FIG. 7 is a block diagram illustrating an outline configuration example of a mobile station according to the second embodiment. Themobile station 301 has a plurality of antennas and, for thetransmission antenna 605, themobile station 301 is provided with abuffer section 600, a transmissionsignal generation section 601, anantenna determination section 602, aradio section 603, aPA section 604, a transmission powerheadroom calculation section 606, a controlinformation transmission section 607, a controlinformation reception section 608, areception antenna 609, and aretransmission control section 610. Fortransmission antennas 605′ and 605″ excluding thetransmission antenna 605, themobile station 301 similarly includesrespective radio sections 603′ and 603″ andrespective PA sections 604′ and 604″. - The
mobile station 301 receives control information with thereception antenna 609. The controlinformation reception section 608 obtains the transmission acknowledgement signal of ACK or NACK and the control information indicating the frequency allocation information, the retransmission antenna information, the transmission power at the time of the retransmission, and the like, from the received control information. - The control
information reception section 608 inputs the transmission acknowledgement signal to theretransmission control section 610, inputs the frequency allocation information to the transmissionsignal generation section 601, inputs the retransmission antenna information to theantenna determination section 602, and inputs the transmission power at the time of the retransmission to thePA section 604. Theretransmission control section 610 inputs transmission data input to thebuffer section 600, to the transmissionsignal generation section 601 when the transmission acknowledgement signal exhibits ACK, and inputs, for retransmission, transmission data, which has not been able to be received correctly by thebase station 303 and which is stored in the buffer, to the transmissionsignal generation section 601 when the transmission acknowledgement signal exhibits NACK. The transmissionsignal generation section 601 subjects the input transmission data to the same processing as the processing fromcoding section 101 to theCP insertion section 108 inFIG. 1 , and inputs the transmission data to theantenna determination section 602. Theantenna determination section 602 selects atransmission antenna 605 for the retransmission which is indicated by the retransmission antenna information input from the controlinformation reception section 608, and inputs the transmission signal input from the transmissionsignal generation section 601 to theradio section 603 of thetransmission antenna 605 for the retransmission. - Furthermore, the
PA section 604 of thetransmission antennas 605 to be used for the retransmission performs amplification based on the transmission power information, notification of which has been received from thebase station 303, and transmits the retransmission data from thetransmission antenna 605 to be used for the retransmission. - The configuration of the
base station 303 is the same as that ofFIG. 2 , and thechannel estimation section 213 inputs the retransmission antenna information and the channel information based on the plurality of antenna channels to the frequency allocation decision section. The frequencyallocation decision section 214 determines the bands to be allocated based on the channel information, and inputs the frequency allocation information and the retransmission antenna information to the controlinformation generation section 215. The frequency allocation information and the retransmission antenna information are converted into control information data in the controlinformation generation section 215 and transmitted from thetransmission antenna 219 via the controlinformation transmission section 216. -
FIG. 8 is a diagram illustrating retransmission processing of the second embodiment. Themobile station 301 periodically notifies thebase station 303 of a PH as the control information (Step S201). In contrast, thebase station 303 determines the transmission power of themobile station 301 in consideration of interference with amobile station 301 within the same cell as that of the PH, notification of which has been received, and notifies themobile station 301 thereof (Step S202). When themobile station 301 performs data transmission, thebase station 303 transmits the control information, which includes the information of allocating the non-contiguous frequency, to the mobile station 301 (Step S203). Themobile station 301 transmits data by using the non-contiguous frequency bands based on the received control information (Step S204). Themobile station 301 performs the data transmission by using the non-contiguous frequency, and thebase station 303 detects an error in the decoded result of the received data by the cyclic redundancy check. When the error has been detected and there is not a transmission power headroom in the PH, notification of which has been periodically received from themobile station 301, thebase station 303 allocates the contiguous bands, designates atransmission antenna 605 having a high channel gain, and performs retransmission request (Step S205). Since there is room for transmission power headroom, the transmission power at the time the retransmission is increased in consideration of a reception SINR (Signal to Interference and Noise power Ratio) which is a channel gain of the antenna used for the retransmission. Themobile station 301 performs the retransmission based on the received control information (Step S206), and thebase station 303 transmits ACK in return when the data has been able to be received correctly (Step S207). - By applying the present embodiment, it is possible to suppress the increase of the retransmission due to a shortage of the transmission power and to improve the cell throughput by the antenna diversity effect, since the
base station 303 changes the transmission method for the retransmission and thetransmission antenna 605 in consideration of a transmission power headroom when thebase station 303 has detected an error in the transmission performed by themobile station 301 through the use of the non-contiguous frequency bands. - In a third embodiment, there will be explained an example in which, when a
mobile station 301 performs data transmission by Clustered DFT-S-OFDM, themobile station 301 changes the bands to be allocated in consideration of a transmission power headroom and increases the transmission power by margin for the back-off, at the time of the retransmission, and switches the number oftransmission antennas 905 to be used for the retransmission. While in the present embodiment, the number of thetransmission antennas 905 in themobile station 301 is set to be two at the time of the retransmission, even three ormore transmission antennas 905 used for the retransmission can be applied. Furthermore, while in the present embodiment, the number oftransmission antennas 905 for the initial transmission is set to be one, the use of a plurality oftransmission antennas 905 can also be applied. -
FIG. 9 is a block diagram illustrating an outline configuration example of a mobile station according to the third embodiment. Themobile station 301 is provided with abuffer section 900, a transmissionmethod determination section 901, a first transmissionsignal generation section 902, aradio section 903, aPA section 904, atransmission antenna 905, a second transmissionsignal generation section 906, aradio section 907, aPA section 908, atransmission antenna 909, a transmission powerheadroom calculation section 910, a controlinformation transmission section 911, a controlinformation reception section 912, areception antenna 913, and aretransmission control section 914. - The
mobile station 301 uses onetransmission antenna 905 and receives the transmission acknowledgement signal that is control information, with thereception antenna 913, after having performed the data transmission through the use of the non-contiguous frequency. The controlinformation reception section 912 obtains the transmission acknowledgement signal of ACK or NACK and control signal indicating the frequency allocation information, the number of the transmission antennas, and the like, from the received signal. - The control
information reception section 912 inputs the transmission acknowledgement signal to theretransmission control section 914, inputs the information of the number of retransmission antennas to the transmissionmethod determination section 901, inputs the frequency allocation information to the first transmissionsignal generation section 902 and the second transmissionsignal generation section 906, and inputs transmission powers of thetransmission antennas PA section 904 and thePA section 908, respectively. When the transmission acknowledgement signal exhibits ACK, transmission data input to thebuffer section 900 is input to the transmissionmethod determination section 901, and, when the transmission acknowledgement signal exhibits NACK, transmission data which has not been able to be received correctly in thebase station 303 and which is stored in the buffer is input to the transmissionmethod determination section 901, for retransmission. - When the retransmission data and the number of the retransmission antennas are input and the number of antennas is two or more, the transmission
method determination section 901 applies predetermined transmission diversity such as CDD (Cyclic Delay Diversity) and SFBC (Space Frequency Block Code). The first transmissionsignal generation section 902 inputs the information whether or not the transmission diversity is applied and the retransmission data, input from the transmissionmethod determination section 901 and performs the same processing as the processing from thecoding section 101 to theCP insertion section 108, inFIG. 1 . The transmission signal is up-converted by theradio section 903, is amplified by thePA section 904 based on the transmission power information, notification of which has been received from the controlinformation reception section 912, and is transmitted from thetransmission antenna 905. - In regard to the
transmission antenna 909, in the same way as thetransmission antenna 905, the retransmission processing is performed based on the information whether or not the transmission diversity is applied and based on the retransmission data input from the transmissionmethod determination section 901. - The configuration of the
base station 303 is the same as that ofFIG. 2 and determination is performed whether or not the decoding has been performed correctly or not, by detecting an error in the decoded result of the received data by the CRC in the cyclicredundancy check section 211. When the cyclicredundancy check section 211 has determined that the received data is correct, thebase station 303 transmits ACK via the transmission acknowledgementsignal transmission section 218. When an error has been detected in the received data, thebase station 303 transmits NACK via the transmission acknowledgementsignal transmission section 218. Furthermore, the information such as the PH stored in the controlinformation buffer section 220 is input to the frequencyallocation decision section 214. - The frequency
allocation decision section 214 determines the frequency allocation, the number of thetransmission antennas 905, and a transmission power, to be used at the time of the retransmission based on the channel information input from thechannel estimation section 213 and the control information such as a PH. The frequency allocation and the number of thetransmission antennas 905 to be used at the time of the retransmission are transmitted as the control information via the controlinformation generation section 215 and the controlinformation transmission section 216. Here, since the peak power is reduced when the transmission method using the contiguous bands is employed at the time of the retransmission, the required back-off amount becomes small. - When the number of antennas used in the retransmission is NANT, the transmission power per one antenna is not set as PTX−Log(NANT), but may be set as PTX−Log (NANT)+α. However, PTX is the transmission power at the time of the initial transmission and a expresses a back-off amount difference between the case of using the bands non-contiguously and the case of using the bands contiguously.
- While in the present embodiment, explanation has been done on the assumption that the transmission diversity is CDD, a diversity method such as SFBC can be applied. When SFBC is used, SFBC decoding is required after performing the multiplication of a weight in the
channel compensation section 207. -
FIG. 10 is a diagram illustrating the retransmission processing of the third embodiment. Themobile station 301 periodically notifies thebase station 303 of a PH as the control information (Step S301). In contrast, thebase station 303 determines the transmission power of themobile station 301 in consideration of interference with amobile station 301 within the same cell as that of the PH, notification of which has been received and notifies themobile station 301 thereof (Step S302). When themobile station 301 performs data transmission, thebase station 303 transmits the control information, which includes information of allocating the non-contiguous frequency, to the mobile station 301 (Step S303). Themobile station 301 transmits data by using the non-contiguous frequency bands based on the received control information (Step S304). Themobile station 301 performs the data transmission by using the non-contiguous frequency and thebase station 303 detects an error in the decoded result of the received data by the cyclic redundancy check. When an error has been detected and there is not a transmission power in the PH, notification of which has been periodically received from themobile station 301, thebase station 303 allocates the contiguous bands, designates the number of the retransmission antennas to be used for the transmission diversity, and performs retransmission request (Step S305). Since the required back-off amount of the transmission power used for the retransmission is reduced by the contiguous allocation, the transmission power of all thetransmission antennas 905 used for the retransmission is increased as compared with the transmission power at the time of the initial transmission. Themobile station 301 performs the retransmission based on the received control information (Step S306), and thebase station 303 transmits ACK in return when the data has been able to be received correctly (Step S307). - By applying the present embodiment, it is possible to suppress the increase of the retransmission due to a shortage of the transmission power and to improve the cell throughput by the transmission diversity effect, since the
base station 303 changes the transmission method and the number of thetransmission antennas 905 for the retransmission in consideration of a transmission power headroom when thebase station 303 has detected an error at the time of the transmission through the use of the non-contiguous frequency bands by themobile station 301. -
- 100 Buffer section
- 101 Coding section
- 102 Modulation section
- 103 DFT section
- 104 Transmission data allocation section
- 105 IDFT section
- 106 Reference signal generation section
- 107 Reference signal insertion section
- 108 CP insertion section
- 109 Radio section
- 110 PA section
- 111 Transmission antenna
- 112 Transmission power headroom calculation section
- 113 Control information transmission section
- 114 Control information reception processing section
- 115 Reception antenna
- 116 Retransmission control section
- 201 Reception antenna
- 202 Radio section
- 203 CP removal section
- 204 Reference signal separation section
- 205 DFT section
- 206 Transmission data extraction section
- 207 Channel compensation section
- 208 IDFT section
- 209 Demodulation section
- 210 Decoding section
- 211 Cyclic redundancy check section
- 213 Channel estimation section
- 214 Frequency allocation decision section
- 215 Control information generation section
- 216 Control information transmission section
- 217 Buffer section
- 218 transmission acknowledgement signal transmission section
- 219 Transmission antenna
- 220 Control information buffer section
- 301 Mobile station
- 303 Base station
- 600 Buffer section
- 601 Transmission signal generation section
- 602 Antenna determination section
- 603 Radio section
- 604 PA section
- 605 Transmission antenna
- 606 Transmission power headroom calculation section
- 607 Control information transmission section
- 608 Control information reception section
- 609 Reception antenna
- 610 Retransmission control section
- 900 Buffer section
- 901 Transmission method determination section
- 902 First transmission signal generation section
- 903 Radio section
- 904 PA section
- 905 Transmission antenna
- 906 Second transmission signal generation section
- 907 Radio section
- 908 PA section
- 909 Transmission antenna
- 910 Transmission power headroom calculation section
- 911 Control information transmission section
- 912 Control information reception section
- 913 Reception antenna
- 914 Retransmission control section
Claims (17)
1. A base station comprising:
a transmission section configured to transmit, to a mobile station, first information indicating first control information for controlling a number of transmission antennas of the mobile station for retransmitting transmission data with at least
second information indicating a retransmission request and
third information indicating second control information for controlling retransmission power for retransmitting the transmission data; and
a radio section configured to receive, from the mobile station, the transmission data.
2. The base station according to claim 1 , wherein
the first information indicates one or more transmission antennas used for retransmitting the transmission data.
3. The base station according to claim 1 , wherein
the first information indicates a coding for a transmit antenna diversity for retransmitting the transmission data.
4. The base station according to claim 1 , wherein
the transmission section is configured to transmit forth information indicating any one of a plurality of access methods for retransmitting the transmission data.
5. The base station according to claim 4 , wherein
the plurality of access methods are comprised of at least a first access method and a second access method,
the first access method allocates a plurality of subcarriers continuously to form a single cluster of subcarriers, and
the second access method non-continuously allocates the plurality of subcarriers in at least a first cluster and a second cluster where the first cluster includes a first portion of the plurality of subcarriers continuously allocated to form the first cluster and where the second cluster includes a second portion of the plurality of subcarriers continuously allocated to form the second cluster.
6. The base station according to claim 5 , wherein
the first access method indicates DFT-S-OFDM, and
the second access method indicates Clustered DFT-S-OFDM.
7. The base station according to claim 1 , wherein
the third information indicates the second control information for increasing the retransmission power.
8. The base station according to claim 1 , wherein
the transmission section is configured to transmit the first information along with at least the second information and the third information in case of performing retransmission request to the mobile station.
9. A mobile station comprising:
a reception section configured to receive, from a base station, first information indicating first control information for controlling a number of transmission antennas of the mobile station for retransmitting transmission data with at least
second information indicating a retransmission request and
third information indicating second control information for controlling retransmission power for retransmitting the transmission data; and
a radio section configured to transmit, to the base station, the transmission data using one or more transmission antennas controlled using the first information.
10. The mobile station according to claim 9 , wherein
the first information indicates one or more transmission antennas used for retransmitting the transmission data.
11. The mobile station according to claim 9 , wherein
the first information indicates a coding for a transmit antenna diversity for retransmitting the transmission data.
12. The mobile station according to claim 9 , wherein
the reception section is configured to receive forth information indicating anyone of a plurality of access methods for retransmitting the transmission data.
13. The mobile station according to claim 12 , wherein
the plurality of access methods are comprised of at least a first access method and a second access method,
the first access method allocates a plurality of subcarriers continuously to form a single cluster of subcarriers, and
the second access method non-continuously allocates the plurality of subcarriers in at least a first cluster and a second cluster where the first cluster includes a first portion of the plurality of subcarriers continuously allocated to form the first cluster and where the second cluster includes a second portion of the plurality of subcarriers continuously allocated to form the second cluster.
14. The mobile station according to claim 13 , wherein
the first access method indicates DFT-S-OFDM, and
the second access method indicates Clustered DFT-S-OFDM.
15. The mobile station according to claim 9 , further comprising:
a control circuit configured to control the retransmission power for retransmitting the transmission data based on the received third information.
16. A base station comprising:
a transmission section configured to transmit, to a mobile station, first information indicating first control information for controlling a number of transmission antennas of the mobile station for retransmitting data with at least
second information indicating a retransmission request,
third information indicating second control information for controlling retransmission power for retransmitting the data,
the transmission section configured to transmit, to the mobile station, forth information indicating any one of a plurality of access methods for retransmitting the data,
the plurality of access methods are comprised of at least a first access method and a second access method,
the first access method allocates a plurality of subcarriers continuously to form a single cluster of subcarriers,
the second access method non-continuously allocates the plurality of subcarriers in at least a first cluster and a second cluster where the first cluster includes a first portion of the plurality of subcarriers continuously allocated to form the first cluster and where the second cluster includes a second portion of the plurality of subcarriers continuously allocated to form the second cluster,
the first access method indicates DFT-S-OFDM, and
the second access method indicates Clustered DFT-S-OFDM.
17. A communication method of a mobile station comprising:
receiving, from a base station, first information indicating first control information for controlling a number of transmission antennas of the mobile station for retransmitting transmission data with at least
second information indicating a retransmission request;
third information indicating second control information for controlling retransmission power for retransmitting the transmission data; and
transmitting, to the base station, the transmission data using one or more transmission antennas controlled using the first information.
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WO2013101342A1 (en) * | 2011-12-29 | 2013-07-04 | Raytheon Bbn Technologies Corp. | Non-contiguous spectral-band modulator and method for non-contiguous spectral-band modulation |
US20140307646A1 (en) * | 2013-04-16 | 2014-10-16 | Qualcomm Incorporated | Enhanced antenna management for uplink operation under carrier aggregation in lte |
EP3054730B1 (en) * | 2013-09-30 | 2020-02-19 | Sony Corporation | Communication control device, communication control method, terminal device, and information processing device |
US10560228B2 (en) * | 2015-05-14 | 2020-02-11 | Cable Television Laboratories, Inc. | Hybrid automatic repeat request (HARQ) in listen before talk systems |
US11051252B2 (en) * | 2018-12-07 | 2021-06-29 | Qualcomm Incorporated | Mitigating spectral emission conditions for high transmission output power during degraded antenna peak gain |
CN113892242A (en) * | 2019-03-15 | 2022-01-04 | 英特尔公司 | Early uplink retransmission memory release based on uplink retransmission indicator prediction |
CN110311877B (en) * | 2019-07-05 | 2022-03-01 | 北京神经元网络技术有限公司 | Multi-subband signal transmission method, device, equipment and medium |
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JP2004112597A (en) * | 2002-09-20 | 2004-04-08 | Matsushita Electric Ind Co Ltd | Base station device and packet quality estimation method |
US20040190485A1 (en) * | 2003-03-24 | 2004-09-30 | Khan Farooq Ullah | Method of scheduling grant transmission in a wireless communication system |
JP4128197B2 (en) | 2003-06-30 | 2008-07-30 | 富士通株式会社 | Multi-input multi-output transmission system |
WO2006082627A1 (en) | 2005-02-01 | 2006-08-10 | Mitsubishi Denki Kabushiki Kaisha | Transmission control method, mobile station and communication system |
JP4527067B2 (en) | 2005-03-31 | 2010-08-18 | 株式会社エヌ・ティ・ティ・ドコモ | Mobile station, transmission method, and mobile communication system |
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US7277492B2 (en) * | 2001-08-28 | 2007-10-02 | Sony Corporation | Transmission apparatus, transmission control method, reception apparatus, and reception control method |
US8335267B2 (en) * | 2006-02-08 | 2012-12-18 | Ntt Docomo, Inc. | Mobile station and a base station |
US8611238B2 (en) * | 2009-04-30 | 2013-12-17 | Samsung Electronics Co., Ltd | Multiplexing large payloads of control information from user equipments |
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EP2442617B1 (en) | 2019-09-25 |
US8654730B2 (en) | 2014-02-18 |
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WO2010143477A1 (en) | 2010-12-16 |
JP5123434B2 (en) | 2013-01-23 |
EP2442617A4 (en) | 2015-11-25 |
CN102461285A (en) | 2012-05-16 |
KR20120036843A (en) | 2012-04-18 |
JPWO2010143477A1 (en) | 2012-11-22 |
KR101518535B1 (en) | 2015-05-07 |
EP2442617A1 (en) | 2012-04-18 |
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