US20110013617A1 - Radio communication method, terminal apparatus, base station apparatus, and radio communication system - Google Patents

Radio communication method, terminal apparatus, base station apparatus, and radio communication system Download PDF

Info

Publication number
US20110013617A1
US20110013617A1 US12/888,587 US88858710A US2011013617A1 US 20110013617 A1 US20110013617 A1 US 20110013617A1 US 88858710 A US88858710 A US 88858710A US 2011013617 A1 US2011013617 A1 US 2011013617A1
Authority
US
United States
Prior art keywords
transmission
transmission method
radio communication
base station
terminal apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/888,587
Other languages
English (en)
Inventor
Akira Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Assigned to FUJITSU LIMITED reassignment FUJITSU LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ITO, AKIRA
Priority to US12/893,186 priority Critical patent/US8600313B2/en
Publication of US20110013617A1 publication Critical patent/US20110013617A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • 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
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • 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
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • 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
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • 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
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/288—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account the usage mode, e.g. hands-free, data transmission, telephone
    • 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
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range

Definitions

  • the present invention relates to a radio communication method, a terminal apparatus, a base station apparatus, and a radio communication system.
  • Non-Patent Document 1 illustrated below, for example.
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single-Carrier Frequency Division Multiple Access
  • the OFDM is a transmission method in which a frequency band is divided into a plurality of sub-carriers and data are transmitted while carried directly on each sub-carrier.
  • the SC-FDMA is a transmission method in which data transformed by DFT (Discrete Fourier Transform) is carried on the sub-carrier and is transmitted.
  • FIG. 18 and FIG. 19 illustrate configuration examples of signal processing circuits employed in SC-FDMA and OFDM, respectively. Referring to FIG.
  • a DFT (Discrete Fourier Transform) unit 101 is included in front of a sub-carrier mapping unit, and DFT-processed signal is input successively into the sub-carrier mapping unit 102 , an IDFT (Inverse Discrete Fourier Transform) unit 103 , and a CP (Cyclic Prefix) insertion unit 104 .
  • transmission data is input into a sub-carrier mapping unit 111 and then input successively into an IDFT unit 112 and a CP insertion unit 113 .
  • the base station or the terminal uses an amplifier to transmit data.
  • the amplifier has a problem that linearity cannot be maintained and the data are distorted, when an input power is large.
  • An upper limit value of the out-of-band emission power (hereinafter, “ACLR”) is determined by an ACLR (Adjacent Carrier Leakage Ratio) standard, and when the data distortion is large, the ACLR can no longer be satisfied.
  • the SC-FDMA is a favorable method due to its low PAPR (Peak to Average Power Ratio), and therefore SC-FDMA is applied to the uplink from the terminal in LTE.
  • Non-Patent Document 1 3GPP TS 36. 211V8. 0. 0 (2007-09)
  • Non-Patent Document 2 Hikmet Sari, Geroges Karam and Isabell Jeanclaude, “Transmission Techniques for Digital Terrestrial TV Broadcasting”, IEEE Communication Magazine, pp. 100-109, February 1995
  • the SC-FDMA is advantageous in terms of the PAPR, because the sub-carrier which is continuous on a frequency axis is used, the sub-carrier cannot be selected non-continuously on the frequency axis, and the SC-FDMA has a constraint in terms of scheduling during resource allocation and the like. Also, as illustrated in FIG. 20 (Non-Patent Document 2, for example), errors are likely to occur in relation to another method even under an identical reception E/N condition.
  • a radio communication method in a radio communication system which performs radio communication between a terminal apparatus and a base station apparatus, the radio communication method including: selecting one of a first transmission method or a second transmission method on the basis of transmission power of transmission signal transmitted from the terminal apparatus, in the base station apparatus; and transmitting the transmission signal to the base station apparatus by the selected first or second transmission method, in the terminal apparatus.
  • a radio communication method in a radio communication system which performs radio communication between a terminal apparatus and a base station apparatus, the radio communication method including: selecting a first transmission method if the terminal apparatus transmits transmission signal by MIMO or selecting a second transmission method if not, in the base station apparatus; and transmitting the transmission signal to the base station apparatus by the selected first or second transmission method, in the terminal apparatus.
  • a terminal apparatus for performing radio communication with a base station apparatus, the terminal apparatus including: a reception unit which receives from the base station apparatus transmission method selection information indicating selected transmission method, which is selected one of a first transmission method or a second transmission method on the basis of transmission power of transmission signal transmitted from the terminal apparatus; and a transmission unit which transmits the transmission signal to the base station apparatus by the first or second transmission method on the basis of the transmission method selection information.
  • a terminal apparatus for performing radio communication with a base station apparatus, the terminal apparatus including: a reception unit which receives from the base station apparatus transmission method selection information indicating that a first transmission method is selected if the terminal apparatus transmits by MIMO or a second transmission method is selected if not; and a transmission unit which transmits the transmission signal to the base station apparatus by the first or second transmission method on the basis of the transmission method selection information.
  • a base station apparatus for performing radio communication with a terminal apparatus, the base station apparatus including: a selection unit which selects one of a first transmission method or a second transmission method on the basis of transmission power of transmission signal transmitted from the terminal apparatus; and a transmission unit which transmits transmission method selection information indicating the selected first or second transmission method to the terminal apparatus, wherein the terminal apparatus transmits the transmission signal by the selected first or second transmission method.
  • a base station apparatus for performing radio communication with a terminal apparatus, the base station apparatus including: a selection unit which selects a first transmission method if the terminal apparatus transmits transmission signal by MIMO or selects a second transmission method if not; and a transmission unit which transmits transmission method selection information indicating the selected first or second transmission method to the terminal apparatus, wherein the terminal apparatus transmits the transmission signal by the selected first or second transmission method.
  • a radio communication system including: a terminal apparatus; and a base station apparatus, wherein radio communication is performed between the terminal apparatus and the base station apparatus, the base station apparatus includes: a selection unit which selects one of a first transmission method or a second transmission method on the basis of transmission power of transmission signal transmitted from the terminal apparatus; and a transmission unit which transmits transmission method selection information indicating the selected first or second transmission method, and the terminal apparatus includes: a reception unit which receives the transmission method selection information; and a transmission unit which transmits the transmission signal to the base station apparatus by the first or said second transmission method on the basis of the transmission method selection information.
  • a radio communication system including: a terminal apparatus; and a base station apparatus, wherein radio communication is performed between the terminal apparatus and the base station apparatus, the base station apparatus includes: a selection unit which selects a first transmission method if the terminal apparatus transmits transmission signal by MIMO, or selects a second transmission method if not; and a transmission unit which transmits transmission method selection information indicating the selected first or second transmission method, and the terminal apparatus includes: a reception unit which receives the transmission method selection information; and a transmission unit which transmits the transmission signal to the base station apparatus by the first or second transmission method on the basis of the transmission method selection information.
  • a radio communication system including: a terminal apparatus; and a base station apparatus, wherein radio communication is performed between the terminal apparatus and the base station apparatus, the base station apparatus or the terminal apparatus includes: a modulation unit which is adaptable to a plurality of transmission method selected in accordance with magnitude of transmission power; and a transmission unit which transmits signal modulated by the modulation unit, and the plurality of transmission method include SC-FDMA method and OFDM method, and a selection is performed to switch from the OFDM method to the SC-FDMA method in response to increase in the transmission power.
  • the inconvenient which occurs when the SC-FDMA is applied can be improved.
  • FIG. 1 illustrates a configuration example of a radio communication system
  • FIG. 2 illustrates a configuration example of a terminal apparatus
  • FIG. 3 illustrates a configuration example of a base station apparatus
  • FIG. 4 illustrates an example of an MPR table
  • FIG. 5 illustrates an example of a sequence diagram indicating an overall operation
  • FIG. 6 illustrates a flowchart of an operational example indicating transmission method determination processing
  • FIG. 7A and FIG. 7B illustrate examples of transmission power decrease widths
  • FIG. 8 illustrates a flowchart of another operational example of transmission method determination processing
  • FIG. 9 illustrates an example of an MPR table
  • FIG. 10 illustrates a flowchart of another operational example of transmission method determination processing
  • FIG. 11 illustrates another configuration example of a base station apparatus
  • FIG. 12 illustrates another configuration example of a base station apparatus
  • FIG. 13 illustrates a flowchart of another operational example of transmission method determination processing
  • FIG. 14 illustrates a flowchart of another operational example of transmission method determination processing
  • FIG. 15 illustrates another configuration example of a terminal apparatus
  • FIG. 16 illustrates another configuration example of a base station apparatus
  • FIG. 17 illustrating a flowchart of another example of overall processing
  • FIG. 18 illustrates a configuration example of a signal processing circuit in a case where SC-FDMA is employed
  • FIG. 19 illustrates a configuration example of a signal processing circuit in a case where OFDM is employed.
  • FIG. 20 illustrates a graph of characteristic example of SC-FDMA and OFDM.
  • FIG. 1 illustrates a configuration example of a radio communication system 1 .
  • the radio communication system 1 includes terminal apparatuses (“terminals” hereinafter) 10 - 1 to 10 - 3 and base station apparatuses (“base stations” hereinafter) 50 - 1 to 50 - 4 . Dotted lines indicate cell ranges of the respective base stations 50 - 1 to 50 - 4 .
  • the terminals 10 - 1 to 10 - 3 are positioned in a cell, the terminals 10 - 1 to 10 - 3 can perform radio communication with the corresponding base stations 50 - 1 to 50 - 4 .
  • FIG. 2 and FIG. 3 illustrates configuration examples of the terminal 10 and the base station 50 , respectively.
  • the terminal 10 includes a known signal reception unit 11 , a path loss calculation unit 12 , a transmission power calculation unit 13 , a known signal transmission unit 14 , a ⁇ (maximum power ⁇ current power) transmission unit ( ⁇ transmission unit hereinafter) 15 , a transmission data buffer 16 , a scheduling request transmission unit 17 , a transmission method reception unit 18 , a data signal modulation unit 19 , and a data signal transmission unit 20 .
  • the known signal reception unit 11 receives a known signal from the base station 50 and outputs the received known signal to the path loss calculation unit 12 .
  • the known signal is transmitted periodically from the base station 50 .
  • the path loss calculation unit 12 calculates a downlink direction propagation path loss (a path loss PL) relative to the base station 50 on the basis of the known signal, and outputs the calculated path loss PL to the transmission power calculation unit 13 .
  • a path loss PL downlink direction propagation path loss
  • the transmission power calculation unit 13 calculates a transmission power on the basis of the path loss PL and so on. A following equation is used in the calculation.
  • P t indicates a data transmission power of the terminal 10 envisaged in accordance with the position of the terminal 10
  • P max is a maximum transmission power determined from capacity of the terminal 10
  • PL is the path loss
  • PL x-ile and R min are constants of power control.
  • the maximum transmission power P max and the two constants PL x-ile , R min are stored in a memory, for example, the transmission power calculation unit 13 reads from the memory, and calculates together with the path loss PL from the path loss calculation unit 12 .
  • the known signal transmission unit 14 transmits the known signal periodically to the base station 50 , for example.
  • the ⁇ transmission unit 15 calculates a difference ⁇ between the maximum transmission power P max and the transmission power P t , and transmits the calculated difference ⁇ to the base station 50 .
  • the difference ⁇ indicates a decrease width from the maximum transmission power P max corresponding to a current position of the terminal 10 . Note that the difference ⁇ may be calculated by the transmission power calculation unit 13 .
  • the transmission data buffer 16 stores transmission data from an application unit or the like.
  • the scheduling request transmission unit 17 transmits a scheduling request to the base station 50 when transmission data is transmitted.
  • the scheduling request transmission unit 17 calculates data amount of the transmission data stored in the transmission data buffer 16 or the like, and transmits the scheduling request including the data amount and a data rate.
  • the transmission method reception unit 18 receives a transmission method transmitted from the base station 50 and outputs to the data signal modulation unit 19 .
  • the data signal modulation unit 19 reads the transmission data from the transmission data buffer 16 and modulates the transmission data on the basis of the transmission method from the transmission method reception unit 18 .
  • the data signal transmission unit 20 transmits the modulated transmission data to the base station 50 .
  • the base station 50 includes a known signal transmission unit 51 , a ⁇ (maximum power ⁇ current power) reception unit (A reception unit hereinafter) 52 , a scheduling request reception unit 53 , an MPR (Maximum Power Reduction) table 54 , a transmission method determination unit 55 , a transmission method transmission unit 56 , and a data reception unit 57 .
  • a reception unit hereinafter a reception unit hereinafter
  • MPR Maximum Power Reduction
  • the known signal transmission unit 51 transmits the known signal to the terminal 10 periodically, for example.
  • the A reception unit 52 receives the difference ⁇ from the terminal 10 and outputs to the transmission method determination unit 55 .
  • the scheduling request reception unit 53 receives the scheduling request from the terminal 10 and outputs to the transmission method determination unit 55 .
  • the MPR table 54 stores respective values of a transmission method (OFDM or SC-FDMA), a modulation scheme (QPSK, 16QAM, and so on), a number of resource blocks (a number of sub-carriers that can be allocated on a frequency axis), and a reduction amount (a transmission power reduction amount hereinafter) P r from the maximum transmission power of the terminal 10 .
  • a transmission method OFDM or SC-FDMA
  • QPSK modulation scheme
  • 16QAM 16QAM
  • P r a transmission power reduction amount
  • the terminal 10 includes an amplifier to transmit the transmission data, and the transmission power reduction amount P r is a value indicating a decrease width by which the transmission power must be reduced from the maximum transmission power in order to satisfy so-called ACLR (the upper limit value of out-of-band emission power) due to constraint of the amplifier in the terminal 10 .
  • ACLR the upper limit value of out-of-band emission power
  • FIG. 4 illustrates an example of the MPR table 54 .
  • the value of the transmission power reduction amount P r differ in accordance with the transmission method, the modulation scheme, and the number of resource blocks.
  • the reason is that transmission waveform transmitted from the terminal 10 differs according to the transmission method and so on, and the transmission power reduction amount P r takes different value according to the transmission waveform. If the transmission method is different even if the modulation scheme and the number of resource brocks are same, the transmission power reduction amount P r is different. The reason is that in OFDM, the PAPR of the transmission power is larger than in SC-FDMA, and therefore the transmission power must be reduced to satisfy the ACLR.
  • the transmission method determination unit 55 determines the transmission method by selecting one of OFDM and SC-FDMA in accordance with the difference ⁇ and a maximum value of the transmission power reduction amount P r read from the MPR table 54 . Determination processing will be described below.
  • the transmission method determination unit 55 performs the determination processing when the scheduling request reception unit 53 receives the scheduling request, for example.
  • the transmission method transmission unit 56 transmits the determined transmission method.
  • the terminal 10 transmits the transmission data on the basis of the transmission method (see FIG. 2 ).
  • the data reception unit 57 receives the transmission data from the terminal 10 and performs reception processing on the basis of the transmission method.
  • FIG. 5 illustrates an example of a sequence diagram indicating an overall operation
  • FIG. 6 illustrates a flowchart indicating an example of the transmission method determination processing.
  • the known signal transmission unit 51 of the base station 50 transmits the known signal to the terminal 10 (S 10 ).
  • the transmission power calculation unit 13 of the terminal 10 calculates the difference ⁇ between the maximum transmission power P max and the transmission power P t of the terminal 10 corresponding to its position (S 11 ).
  • the scheduling request transmission unit 17 of the terminal 10 transmits the scheduling request (S 12 ).
  • the ⁇ transmission unit 15 transmits the difference ⁇ at the transmission timing of the scheduling request.
  • the ⁇ transmission unit 15 outputs the calculated difference ⁇ to the scheduling request transmission unit 17 , and the scheduling request transmission unit 17 may transmit the scheduling request including the difference ⁇ .
  • the transmission method determination unit 55 of the base station 50 determines the transmission method (S 13 ).
  • the processing shifts to the transmission method determination processing ( FIG. 6 ), in which the transmission method determination unit 55 compares the maximum value of the transmission power reduction amount P r with the difference ⁇ (S 20 ). If the maximum value of the transmission power reduction amount P r is larger than the difference ⁇ , the transmission method determination unit 55 selects SC-FDMA (S 21 ). On the other hand, if the maximum value of the transmission power reduction amount P r and the difference ⁇ are identical or the difference ⁇ is larger than the maximum value of the transmission power reduction amount P r , the transmission method determination unit 55 selects OFDM (S 22 ).
  • the transmission method determination unit 55 may select SC-FDMA if the base station 50 detects that the transmission power of the mobile station exceeds a predetermined threshold, and may select OFDM if the base station 50 detects that the transmission power of the mobile station is smaller than the predetermined threshold.
  • FIG. 7A illustrates an example in which the transmission power is set on the ordinate and the maximum value of the transmission power reduction amount P r is larger than the difference ⁇ .
  • FIG. 7B illustrates an opposite example.
  • the difference ⁇ indicates the transmission power decrease width from the maximum transmission power corresponding to the position of the terminal 10 .
  • (the maximum value of) the transmission power reduction amount P r indicates (a maximum value of) the decrease width by which the transmission power must be reduced from the maximum transmission power due to the constraints of the amplifier in order to satisfy the linearity of the amplifier in the terminal 10 and thereby satisfy the ACLR (the upper limit value of the out-of-band emission power). If (the maximum value of) the transmission power reduction amount P r is larger than the difference ⁇ (see FIG. 7A ), this indicates that the terminal 10 should be capable of transmission at the decrease width ⁇ in accordance with its position, but the terminal 10 may transmit by excess reduced power due to the constraints of the amplifier.
  • a case in which the transmission power is reduced further due to the constraints of the amplifier corresponds to a case in which the terminal 10 is far from the base station 50 .
  • the PAPR is larger in OFDM than in SC-FDMA, and therefore, in OFDM, an average transmission power must be reduced below that of SC-FDMA in order to satisfy the linearity of the amplifier and thereby satisfy the ACLR standard. If the terminal 10 is positioned far from the base station 50 , data is transmitted at the maximum transmission power as much as possible in order to increase a reception characteristic of the base station 50 .
  • the transmission method determination unit 55 selects SC-FDMA as the transmission method.
  • the power decrease width ⁇ corresponding to the position is equal to or greater than (the maximum value of) the transmission power reduction width P r from the constraints of the amplifier, and therefore the transmission power is reduced sufficiently to satisfy the constraints of the amplifier. If the transmission power can be reduced in this manner, data can be transmitted sufficiently even if the terminal 10 is close to the base station 50 , and even if data are transmitted using OFDM having a high PAPR, both the linearity of the amplifier and the ACLR are satisfied.
  • the transmission method determination unit 55 selects OFDM.
  • OFDM By the selection of OFDM, a radio characteristic is improved in comparison with SC-FDMA and scheduling is flexible.
  • the transmission method determination unit 55 reads from the MPR table 54 the maximum value (4.5 dB in the example illustrated in FIG. 4 ) of the transmission power reduction amount P r .
  • the maximum value of the transmission power reduction amount P r is stored in the MPR table 54 alone as a threshold.
  • the transmission method determination unit 55 may then compare the threshold with the difference ⁇ .
  • the transmission method transmission unit 56 of the base station 50 notifies the determined transmission method to the terminal 10 (S 14 ).
  • the data signal modulation unit 19 of the terminal 10 modulates the transmission data in accordance with the notified transmission method (S 15 ).
  • the data signal transmission unit 20 of the terminal 10 transmits the data signal to the base station 50 (S 16 ).
  • the data reception unit 57 of the base station 50 demodulates the data signal in accordance with the selected transmission method (S 17 ). The series of processes is then terminated.
  • data are not transmitted uniformly by SC-FDMA on the uplink, and the data may be transmitted after switching to OFDM, for example.
  • OFDM has better radio characteristic than SC-FDMA, and therefore an improvement in the radio characteristic can be achieved in comparison with a case in which the data are transmitted uniformly by SC-FDMA.
  • resource allocation scheduling not using sub-carriers that are continuous on the frequency axis can be performed, and therefore scheduling flexibility can be secured in comparison with a case in which the data are transmitted uniformly by SC-FDMA.
  • the mobile station may include the transmission method determination unit 55 .
  • the transmission method can be determined by the mobile station.
  • the transmission method determination unit 55 of the mobile station detects that its own transmission power has exceeded the predetermined threshold or that the maximum value of the transmission power reduction amount P r is larger than the difference ⁇ , the transmission method determination unit 55 controls the data modulation unit 19 such that transmission is performed using the SC-FDMA method.
  • the transmission method determination unit 55 of the mobile station detects that its own transmission power is lower than the predetermined threshold or that the maximum value of the transmission power reduction amount P r is smaller than the difference ⁇ , the transmission method determination unit 55 controls the data modulation unit 19 such that transmission is performed using the OFDM method.
  • the base station 50 can notify the switch destination method (the SC-FDMA method or the OFDM method) before the method is switched by making the switch destination method transmit to the base station 50 from the data signal transmission unit 20 . Even if the notification is not performed, the switch destination method can be detected by having the base station 50 perform reception processing in relation to both methods respectively.
  • the switch destination method the SC-FDMA method or the OFDM method
  • the transmission method determination unit 55 compares the maximum value of the transmission power reduction amount P r with the difference ⁇ .
  • the transmission method is determined by comparing the transmission power reduction amount P r with the difference ⁇ , after selecting the modulation method and the number of resource blocks, and reading corresponding items from the MPR table 54 .
  • the overall configuration of the radio communication system 1 and the respective configurations of the terminal 10 and the base station 50 are identical to those of the first embodiment (see FIG. 1 to FIG. 3 ). Further, the processing up to the point at which the base station 50 receives the scheduling request from the terminal 10 (S 12 of FIG. 5 ) is similar to that of the first embodiment.
  • the transmission method determination unit 55 inputs the scheduling request from the scheduling request reception unit 53 , and performs the transmission method determination processing (S 13 ).
  • FIG. 8 illustrates flowchart indicating operational example of the transmission method determination processing
  • FIG. 9 illustrates an example of the MPR table 54 .
  • the transmission method determination unit 55 selects the transmission method (S 30 )
  • the transmission method determination unit 55 selects on the basis of a determined format (the modulation scheme and the number of resource blocks) (S 31 ).
  • the transmission method determination unit 55 determines a format in which the modulation scheme is “16QAM” and the number of resource blocks is “1”. The transmission method determination unit 55 then reads corresponding items from the MPR table 54 .
  • FIG. 9 illustrates an example of the MPR table 54 indicating the corresponding items. The transmission method determination unit 55 then reads the transmission power reduction amount P r of the OFDM method from the corresponding items. In the example illustrated in FIG. 9 , the transmission power reduction amount P r is “3”.
  • the format may be determined by the scheduling request reception unit 53 rather than the transmission method determination unit 55 .
  • the scheduling request reception unit 53 outputs the determined format to the transmission method determination unit 55 , and the transmission method determination unit 55 performs the processing described above on the basis of the format.
  • the transmission method is selected further taking the transmission bit count into consideration in the third embodiment in comparison with the second embodiment.
  • the terminal 10 transmits to the base station 50 the scheduling request including a data amount (the transmission bit count) ( FIG. 2 , S 12 of FIG. 5 ). If the transmission bit count is small, the terminal 10 can reduce the transmission power further.
  • the transmission method determination unit 55 sets a decrease width corresponding to the transmission bit count as ⁇ 1 and determines the transmission method by comparing ( ⁇ + ⁇ 1 ) (decrease width ( ⁇ + ⁇ 1 ) hereinafter) with the transmission power reduction amount P r .
  • the configurations of the radio communication system 1 , the terminal 10 , and the base station 50 according to the third embodiment are similar to those of the first embodiment.
  • the transmission method determination unit 55 determines the power decrease width ⁇ 1 corresponding to the transmission bit count.
  • the determination is such that the transmission method determination unit 55 includes a table of decrease widths ⁇ 1 corresponding to transmission bit counts and reads the decrease width ⁇ 1 corresponding to the transmission bit count from the table of decrease width ⁇ 1 .
  • the transmission method determination unit 55 stores inside a formula for calculating the decrease width from the transmission bit count, may calculates and determine the decrease width ⁇ 1 from the formula.
  • the bas station apparatus 50 further includes a transmission bit count table 60 as illustrated in FIG. 11 , and the transmission method determination unit 55 may read the decrease width ⁇ 1 corresponding to the transmission bit count.
  • FIG. 10 illustrates a flowchart indicating an example of transmission method determination processing according to the third embodiment. This processing is similar to the processing of the first embodiment up to the point at which the base station 50 receives the scheduling request.
  • the transmission method determination unit 55 determines the power decrease width ⁇ 1 on the basis of the transmission bit count included in the scheduling request (S 41 ) and selects the transmission method corresponding to the format in the similar manner to the second embodiment (S 40 , S 42 ).
  • the transmission method determination unit 55 selects SC-FDMA, and if the power reduction amount P r of OFDM is not larger than the decrease width ( ⁇ + ⁇ 1 ), the transmission method determination unit 55 selects OFDM (S 43 ). In other words, if the amount of transmission data is small enough to be transmitted at a low transmission power, OFDM is selected, and if not, SC-FDMA is selected. Subsequent processing is similar to that of the first embodiment.
  • an encoding ratio may be used in addition to the transmission bit count.
  • the transmission bit count table 60 stores decrease widths ⁇ 1 corresponding to encoding ratios.
  • the scheduling request reception unit 53 determines the encoding ratio and outputs to the transmission method determination unit 55 .
  • the transmission method determination unit 55 determines the transmission method by reading the decrease width ⁇ 1 corresponding to the encoding ratio from the table 60 .
  • the transmission method is determined taking into consideration a power decrease width 42 corresponding to the instruction.
  • the instruction is also known as an Overload Indicator, and if the transmission power of the terminal 10 is large such that interference is applied to the terminal of another cell, the transmission power of the terminal 10 is reduced in accordance with the instruction.
  • FIG. 12 illustrates a configuration example of the base station 50 .
  • the base station 50 includes a network reception unit 70 so as to be capable of receiving the instruction (Overload Indicator) from another base station via the network.
  • FIG. 13 illustrates a flowchart indicating an example of the transmission method selection processing.
  • the processing up to the point at which the base station 50 receives the scheduling request (S 12 in FIG. 5 ) is similar to that of the first embodiment.
  • the network reception unit 70 If the network reception unit 70 receives the instruction from another base station, the network reception unit 70 outputs the power decrease width 42 corresponding to the instruction (S 50 ).
  • the network reception unit 70 A includes inside a table, and reads the corresponding decrease width 42 from the table and outputs.
  • the transmission method determination unit 55 determines the format in a similar manner to the second embodiment (S 52 ), reads the corresponding items from the MPR table 54 , compares the decrease width ( ⁇ + ⁇ 2 ) with the transmission power reduction amount P r of OFDM, and determines the transmission method (S 51 , S 53 ).
  • the transmission method determination unit 55 selects SC-FDMA, and if the power reduction amount P r of OFDM is not larger than the decrease width ( ⁇ + ⁇ 2 ), the transmission method determination unit 55 selects OFDM (S 53 ). In other words, if transmission can be performed at a sufficiently low transmission power in accordance with the instruction, OFDM is selected, and if not, SC-FDMA is selected. Subsequent processing is similar to that of the first embodiment and so on.
  • the fifth embodiment is an example of a case in which the transmission method is determined according to whether or not the terminal 10 performs MIMO (Multiple-Input Multiple-Output) transmission.
  • MIMO Multiple-Input Multiple-Output
  • MIMO is a method for obtaining a transmission signal by receiving transmission signal transmitted from a plurality of transmission antennae in a single reception antenna and synthesizing the reception signal such that the reception signal is canceled. MIMO is used to obtain further throughput in an environment having a favorable reception SIR (Signal to Interference Ratio).
  • the reception side may not use the frequency equalizer and the sub-carrier is orthogonal, and therefore multipath interference does not occur during reception signal processing even if any weighting coefficient is used. Accordingly, reception can be performed using the weighting coefficient for eliminating the inter-stream interference of MIMO.
  • the transmission method determination unit 55 selects OFDM if MIMO transmission is to be performed, and selects SC-FDMA if MIMO transmission is not to be performed (S 60 to S 62 in FIG. 14 ).
  • the scheduling request transmission unit 17 of the terminal 10 transmits the scheduling request including an information indicating whether or not MIMO transmission is to be performed.
  • the transmission method determination unit 55 may read the information from the scheduling request, and determine the transmission method.
  • the data is transmitted from the terminal 10 by using OFDMA, and therefore the radio characteristic of the reception signal deteriorates to a smaller extent than if transmission is performed by using SC-FDMA.
  • the sixth embodiment is an example of a case in which the base station 50 calculates the difference ⁇ .
  • FIG. 15 and FIG. 16 illustrates a configuration example of the terminal 10 and the base station 50 respectively
  • FIG. 17 illustrates a sequence diagram of overall processing.
  • the base station 50 calculates the difference ⁇ , and therefore the base station 50 includes the known signal reception unit 11 , the path loss calculation unit 12 , and the transmission power calculation unit 13 .
  • the known signal transmission unit 14 of the terminal 10 transmits the known signal to the base station 50 (S 70 ).
  • the known signal reception unit 11 of the base station 50 receives the known signal, and the transmission power calculation unit 13 calculates the difference ⁇ between the maximum transmission power P max and the transmission power P t corresponding to the current position, by using (Numeral 1 ) and so on (S 71 ). Subsequent processing is similar to that of the first embodiment.
  • the sixth embodiment may also be applied to any of the second to fourth embodiments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
US12/888,587 2008-03-25 2010-09-23 Radio communication method, terminal apparatus, base station apparatus, and radio communication system Abandoned US20110013617A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/893,186 US8600313B2 (en) 2008-03-25 2010-09-29 Radio communication method in radio communication system, terminal apparatus, base station apparatus, and radio communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2008/000717 WO2009118777A1 (ja) 2008-03-25 2008-03-25 無線通信方法、端末装置、基地局装置、及び無線通信システム

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/000717 Continuation WO2009118777A1 (ja) 2008-03-25 2008-03-25 無線通信方法、端末装置、基地局装置、及び無線通信システム

Related Child Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/000717 Division WO2009118777A1 (ja) 2008-03-25 2008-03-25 無線通信方法、端末装置、基地局装置、及び無線通信システム

Publications (1)

Publication Number Publication Date
US20110013617A1 true US20110013617A1 (en) 2011-01-20

Family

ID=41113022

Family Applications (2)

Application Number Title Priority Date Filing Date
US12/888,587 Abandoned US20110013617A1 (en) 2008-03-25 2010-09-23 Radio communication method, terminal apparatus, base station apparatus, and radio communication system
US12/893,186 Expired - Fee Related US8600313B2 (en) 2008-03-25 2010-09-29 Radio communication method in radio communication system, terminal apparatus, base station apparatus, and radio communication system

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/893,186 Expired - Fee Related US8600313B2 (en) 2008-03-25 2010-09-29 Radio communication method in radio communication system, terminal apparatus, base station apparatus, and radio communication system

Country Status (5)

Country Link
US (2) US20110013617A1 (zh)
EP (2) EP2259654A4 (zh)
JP (1) JPWO2009118777A1 (zh)
CN (1) CN101978730A (zh)
WO (1) WO2009118777A1 (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100080154A1 (en) * 2008-09-26 2010-04-01 Lg Electronics Inc. Method of transmitting reference signals in a wireless communication having multiple antennas
CN102711196A (zh) * 2012-06-14 2012-10-03 大唐移动通信设备有限公司 一种在lte系统中传输模式间切换的方法及装置
US20150327189A1 (en) * 2013-01-24 2015-11-12 Lg Electronics Inc. Method for controlling transmission power of discovery signal for device-to-device communication in wireless communication system and device for same
US20180242225A1 (en) * 2014-06-13 2018-08-23 Qualcomm Incorporated Wireless communications over unlicensed radio frequency spectrum
US11201774B2 (en) 2016-11-08 2021-12-14 Datang Mobile Communications Equipment Co., Ltd. Uplink waveform acquisition method, uplink waveform feedback method, terminal and base station

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011112909A2 (en) * 2010-03-12 2011-09-15 Sunrise Micro Devices, Inc. Power efficient communications
US8565205B2 (en) * 2010-11-04 2013-10-22 Qualcomm Incorporated Specific absorption rate backoff in power headroom report
EP2724480B1 (en) * 2011-06-21 2015-08-19 Telefonaktiebolaget L M Ericsson (publ) Selecting uplink multi-antenna transmission to enhance coverage
US8649307B1 (en) * 2011-08-02 2014-02-11 Xilinx, Inc. Mobile communication with modes for single carrier and spatial and frequency multiplexing
US10397947B2 (en) 2016-08-12 2019-08-27 Qualcomm Incorporated Adaptive waveform selection in wireless communications
CN109804579A (zh) * 2016-09-28 2019-05-24 Idac控股公司 用于多波形数据传输的公共控制信道和参考符号
JP2020017774A (ja) * 2016-11-02 2020-01-30 株式会社Ｎｔｔドコモ ユーザ装置、基地局及び送信電力制御方法
ES2964933T3 (es) * 2017-05-02 2024-04-10 Sony Group Corp Aparato de comunicación y método de comunicación
CN112534786A (zh) * 2018-08-10 2021-03-19 苹果公司 无线系统的下行链路波形类型和保护间隔适应
JP2022151520A (ja) * 2021-03-23 2022-10-07 スターライト テクノロジーズ リミテッド メッシュネットワークを用いたネットワーク高密度化のための統合無線アクセスバックホールデバイス

Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040082356A1 (en) * 2002-10-25 2004-04-29 Walton J. Rodney MIMO WLAN system
US20060057978A1 (en) * 2004-09-16 2006-03-16 Love Robert T Wireless transmitter configuration
US20060245346A1 (en) * 2004-12-02 2006-11-02 Yeheskel Bar-Ness Method and/or system for reduction of PAPR
US20070195906A1 (en) * 2006-01-20 2007-08-23 Qualcomm Incorporated Method and apparatus for pilot multiplexing in a wireless communication system
US20070264936A1 (en) * 2006-02-06 2007-11-15 Lg Electronics Inc. Method of allocating radio resources in multi-carrier system
US20070293233A1 (en) * 2006-06-19 2007-12-20 Nec Corporation Method for measuring channel quality and base station in mobile communications system
US20080037413A1 (en) * 2006-08-11 2008-02-14 Samsung Electronics Co., Ltd. Method and apparatus for uplink scheduling in a mobile communication system
US20080095263A1 (en) * 2006-06-29 2008-04-24 Hao Xu Method And Apparatus For Selection Mechanism Between OFDM-MIMO And LFDM-SIMO
US20080214126A1 (en) * 2007-03-01 2008-09-04 Keith Holt Adaptive mode transmitter for papr reduction and link optimization
US20080298316A1 (en) * 2006-02-09 2008-12-04 Altair Semiconductor Ltd. Low Peak-To-Average Power Ratio Transmission in Frequency-Division Multiple Access Systems
US20090225666A1 (en) * 2006-03-20 2009-09-10 Ntt Docomo, Inc. Base station, mobile station, and propagation path measuring signal transmission control method
US20100027409A1 (en) * 2006-10-19 2010-02-04 Yeong Hyeon Kwon Method for transmitting control signal
US20100039927A1 (en) * 2006-11-10 2010-02-18 Electronics And Telecommunications Research Institute Pilot transmitting apparatus and method for sc-fdma system
US20100061480A1 (en) * 2006-06-29 2010-03-11 Kyocera Corporation Radio communication method and radio communication terminal
US20100091919A1 (en) * 2006-11-01 2010-04-15 Qualcomm Incorporated Joint use of multi-carrier and single-carrier multiplexing schemes for wireless communication
US20100093386A1 (en) * 2006-10-31 2010-04-15 Qualcomm Incorporated Random access for wireless communication
US20100272055A1 (en) * 2007-12-24 2010-10-28 Panasonic Corporation Method of multiplexing multiple access region
US8073451B2 (en) * 2006-03-29 2011-12-06 Nec Corporation System and method for wireless resource allocation, and base station used therefor
US20120172081A1 (en) * 2006-01-23 2012-07-05 Motorola Mobility, Inc. Power control in schedulable wireless communication terminal
US20130058297A1 (en) * 2007-03-01 2013-03-07 Hiroyuki Ishii Base station apparatus and communication control method
US20130165132A1 (en) * 2006-07-25 2013-06-27 Motorola Mobility Llc Spectrum emission level variation in schedulable wireless communication terminal
US8477735B1 (en) * 2009-04-30 2013-07-02 Sprint Spectrum L.P. System and method for access terminal transition between a MIMO reverse-link mode and a non-MIMO reverse-link mode

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020193146A1 (en) * 2001-06-06 2002-12-19 Mark Wallace Method and apparatus for antenna diversity in a wireless communication system
US20070291635A1 (en) * 2006-06-15 2007-12-20 Motorola, Inc. Method and apparatus for switching between ofdm communication modes

Patent Citations (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040082356A1 (en) * 2002-10-25 2004-04-29 Walton J. Rodney MIMO WLAN system
US20060057978A1 (en) * 2004-09-16 2006-03-16 Love Robert T Wireless transmitter configuration
US20060245346A1 (en) * 2004-12-02 2006-11-02 Yeheskel Bar-Ness Method and/or system for reduction of PAPR
US20100142490A1 (en) * 2006-01-20 2010-06-10 Qualcomm Incorporated Method and apparatus for pilot multiplexing in a wireless communication system
US20070195906A1 (en) * 2006-01-20 2007-08-23 Qualcomm Incorporated Method and apparatus for pilot multiplexing in a wireless communication system
US8130857B2 (en) * 2006-01-20 2012-03-06 Qualcomm Incorporated Method and apparatus for pilot multiplexing in a wireless communication system
US20120172081A1 (en) * 2006-01-23 2012-07-05 Motorola Mobility, Inc. Power control in schedulable wireless communication terminal
US20070264936A1 (en) * 2006-02-06 2007-11-15 Lg Electronics Inc. Method of allocating radio resources in multi-carrier system
US8064834B2 (en) * 2006-02-06 2011-11-22 Lg Electronics Inc. Method of allocating radio resources in multi-carrier system
US20080298316A1 (en) * 2006-02-09 2008-12-04 Altair Semiconductor Ltd. Low Peak-To-Average Power Ratio Transmission in Frequency-Division Multiple Access Systems
US20120014339A1 (en) * 2006-02-09 2012-01-19 Altair Semiconductor Ltd. Low Peak-To-Average Power Ratio Transmission in Frequency-Division Multiple Access Systems
US20090225666A1 (en) * 2006-03-20 2009-09-10 Ntt Docomo, Inc. Base station, mobile station, and propagation path measuring signal transmission control method
US8073451B2 (en) * 2006-03-29 2011-12-06 Nec Corporation System and method for wireless resource allocation, and base station used therefor
US20070293233A1 (en) * 2006-06-19 2007-12-20 Nec Corporation Method for measuring channel quality and base station in mobile communications system
US20080095263A1 (en) * 2006-06-29 2008-04-24 Hao Xu Method And Apparatus For Selection Mechanism Between OFDM-MIMO And LFDM-SIMO
US20100061480A1 (en) * 2006-06-29 2010-03-11 Kyocera Corporation Radio communication method and radio communication terminal
US20130165132A1 (en) * 2006-07-25 2013-06-27 Motorola Mobility Llc Spectrum emission level variation in schedulable wireless communication terminal
US20080037413A1 (en) * 2006-08-11 2008-02-14 Samsung Electronics Co., Ltd. Method and apparatus for uplink scheduling in a mobile communication system
US20100278168A1 (en) * 2006-10-19 2010-11-04 Yeong Hyeon Kwon Method for transmitting control signal
US20100027409A1 (en) * 2006-10-19 2010-02-04 Yeong Hyeon Kwon Method for transmitting control signal
US20100093386A1 (en) * 2006-10-31 2010-04-15 Qualcomm Incorporated Random access for wireless communication
US20100091919A1 (en) * 2006-11-01 2010-04-15 Qualcomm Incorporated Joint use of multi-carrier and single-carrier multiplexing schemes for wireless communication
US20100039927A1 (en) * 2006-11-10 2010-02-18 Electronics And Telecommunications Research Institute Pilot transmitting apparatus and method for sc-fdma system
US7974258B2 (en) * 2007-03-01 2011-07-05 Intel Corporation Adaptive mode transmitter for PAPR reduction and link optimization
US20080214126A1 (en) * 2007-03-01 2008-09-04 Keith Holt Adaptive mode transmitter for papr reduction and link optimization
US20130058297A1 (en) * 2007-03-01 2013-03-07 Hiroyuki Ishii Base station apparatus and communication control method
US20100272055A1 (en) * 2007-12-24 2010-10-28 Panasonic Corporation Method of multiplexing multiple access region
US8477735B1 (en) * 2009-04-30 2013-07-02 Sprint Spectrum L.P. System and method for access terminal transition between a MIMO reverse-link mode and a non-MIMO reverse-link mode

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100080154A1 (en) * 2008-09-26 2010-04-01 Lg Electronics Inc. Method of transmitting reference signals in a wireless communication having multiple antennas
US8428018B2 (en) * 2008-09-26 2013-04-23 Lg Electronics Inc. Method of transmitting reference signals in a wireless communication having multiple antennas
US9385906B2 (en) 2008-09-26 2016-07-05 Lg Electronics Inc. Method of transmitting reference signals in a wireless communication having multiple antennas
CN102711196A (zh) * 2012-06-14 2012-10-03 大唐移动通信设备有限公司 一种在lte系统中传输模式间切换的方法及装置
US20150327189A1 (en) * 2013-01-24 2015-11-12 Lg Electronics Inc. Method for controlling transmission power of discovery signal for device-to-device communication in wireless communication system and device for same
US9807710B2 (en) * 2013-01-24 2017-10-31 Lg Electronics Inc. Method for controlling transmission power of discovery signal for device-to-device communication in wireless communication system and device for same
US20180242225A1 (en) * 2014-06-13 2018-08-23 Qualcomm Incorporated Wireless communications over unlicensed radio frequency spectrum
US10708850B2 (en) * 2014-06-13 2020-07-07 Qualcomm Incorporated Wireless communications over unlicensed radio frequency spectrum
US11330503B2 (en) 2014-06-13 2022-05-10 Qualcomm Incorporated Wireless communications over unlicensed radio frequency spectrum
US11201774B2 (en) 2016-11-08 2021-12-14 Datang Mobile Communications Equipment Co., Ltd. Uplink waveform acquisition method, uplink waveform feedback method, terminal and base station

Also Published As

Publication number Publication date
EP2259654A4 (en) 2014-01-08
US8600313B2 (en) 2013-12-03
EP2267965A3 (en) 2011-04-06
CN101978730A (zh) 2011-02-16
WO2009118777A1 (ja) 2009-10-01
EP2259654A1 (en) 2010-12-08
US20110021226A1 (en) 2011-01-27
JPWO2009118777A1 (ja) 2011-07-21
EP2267965A2 (en) 2010-12-29

Similar Documents

Publication Publication Date Title
US8600313B2 (en) Radio communication method in radio communication system, terminal apparatus, base station apparatus, and radio communication system
US8059611B2 (en) Maintaining a constant transmission power density of a data signal utilizing prohibited subcarriers
US8483134B2 (en) Radio transmission appratus and radio transmission method that switch between communication methods
US20220014321A1 (en) Scheduling data transmissions between a mobile terminal and a base station in a wireless communications network using component carriers
US8873485B2 (en) Mobile station apparatus, base station apparatus, communication system, communication method and control program
JP4672063B2 (ja) 移動局、通信制御方法及び移動通信システム
CN101983529B (zh) 用于捕获指示信道的灵活功率偏移量分配
EP2442617B1 (en) Wireless communication system, base station, mobile station, base station control program, and mobile station control program
US20100254326A1 (en) Base station apparatus, user apparatus and communication control method
KR20090057112A (ko) 서브밴드 스케줄링 및 전력 증폭기 백오프 조절
US20120258762A1 (en) Transmission apparatus, wireless communication system, mobile station apparatus control program, and base station apparatus control program
AU2010211875B2 (en) Wireless communication system, base station apparatus, mobile station apparatus, and communication method
US8730896B2 (en) Transmit power control method and transmission apparatus
US8599942B2 (en) Receiving device and adaptive modulation method
US6999497B2 (en) Data transmitting apparatus and data transmitting method
JP2009225363A (ja) 無線伝送装置
US8300579B2 (en) Method for improving reverse gain
US20100086070A1 (en) User apparatus, base station apparatus, mobile communication system and communication control method
US9118438B2 (en) Communication apparatus and communication method
US20110216716A1 (en) Mobile Subscriber Information Transmission Over Multiple Uplink Frames
CN102014447A (zh) 无线通信方法、终端装置、基站装置及无线通信系统
JP2011030257A (ja) 無線通信方法、端末装置、基地局装置、及び無線通信システム
US11564238B2 (en) Network node, a wireless device and respective method performed thereby for communicating therebetween
KR20230097918A (ko) 무선 통신 시스템에서 신호 보상을 위한 장치 및 방법
WO2012153520A1 (ja) 基地局および無線リソース割り当て方法

Legal Events

Date Code Title Description
AS Assignment

Owner name: FUJITSU LIMITED, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ITO, AKIRA;REEL/FRAME:025033/0711

Effective date: 20100913

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION