WO2008013259A1 - Procédé de communication sans fil et terminal de communication sans fil - Google Patents
Procédé de communication sans fil et terminal de communication sans fil Download PDFInfo
- Publication number
- WO2008013259A1 WO2008013259A1 PCT/JP2007/064754 JP2007064754W WO2008013259A1 WO 2008013259 A1 WO2008013259 A1 WO 2008013259A1 JP 2007064754 W JP2007064754 W JP 2007064754W WO 2008013259 A1 WO2008013259 A1 WO 2008013259A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmission power
- carrier
- difference
- power difference
- control information
- Prior art date
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Classifications
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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
- H04W52/16—Deriving transmission power values from another channel
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- 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
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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
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
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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
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
Definitions
- the present invention relates to a radio communication method in the uplink direction by a multicarrier using a plurality of carriers, and a radio communication terminal that performs communication using the multicarrier.
- 3GPP2 3rd Generation Partnership Project 2
- Le multi-carrier
- a wireless communication terminal In the case of multi-carrier, a wireless communication terminal (Access Terminal) generally adopts a configuration in which a plurality of carriers are transmitted using the same wireless communication circuit from the viewpoints of downsizing and manufacturing cost reduction. . Therefore, in order to reduce interference between adjacent carriers with a predetermined frequency interval (1.25 MHz interval), the transmission power difference between adjacent carriers should be kept within a predetermined threshold (MaxRLTxPwrDiff, for example, 15 dB). (For example, Non-Patent Document 1).
- Non-Patent Document 1 "cdma2000 High Rate Packet Data Air Interface 3GPP2 C.S0024-B Version 1.0", 3GPP2, June 2006
- 3GPP2 stipulates that the transmission power difference between adjacent carriers be suppressed within a predetermined threshold (MaxRL TxPwrDiff). However, depending on the state of communication between the wireless communication terminal and the wireless base station (Access Network), it may not be possible to maintain the transmission power difference within a predetermined threshold! /.
- a wireless communication terminal moves away from a first wireless base station that performs communication using a first carrier and is adjacent to the first carrier with a predetermined frequency interval. If you are communicating with the second radio base station! /, The wireless communication terminal needs to increase the transmission power of the first carrier in order to maintain communication with the first wireless base station using the first carrier. Furthermore, the wireless communication terminal reduces the transmission power of the second carrier as it approaches the second wireless base station.
- the radio communication terminal maintains the transmission power difference within a predetermined threshold. May not be possible.
- the present invention has been made in view of such a situation, and continues multi-carrier communication while suppressing interference between adjacent carriers having a predetermined frequency interval. It is an object of the present invention to provide a wireless communication method and a wireless communication terminal that can perform communication.
- One feature of the present invention is that the first carrier and a multicarrier using at least a second carrier adjacent to the first carrier having a predetermined frequency interval are used in the uplink direction. According to power control information generated by a radio base station connected via the first carrier based on reception quality of uplink data using the first carrier, the radio communication method uses the first carrier.
- a step of controlling transmission power of a second carrier a step of calculating a transmission power difference between the first carrier and the second carrier; and And determining whether or not a threshold value set is exceeded based on the maximum transmission power difference allowed between the first carrier and the second carrier, and the first carrier or the In the step of controlling the transmission power of the second carrier, when the transmission power difference exceeds a threshold set based on the maximum transmission power difference! /,
- the first carrier or the second carrier The gist is to control the transmission power of the first carrier or the second carrier while keeping the transmission power difference within the maximum transmission power difference without following the power control information corresponding to.
- the transmission power difference exceeds a threshold set based on the maximum transmission power difference, the transmission power is not obeyed according to the power control information corresponding to the first carrier or the second carrier.
- the adjacent carriers having a predetermined frequency interval are controlled. Multi-carrier communication can be continued while suppressing interference.
- the transmission power difference is the maximum transmission power difference.
- the power control information corresponding to a carrier having a high transmission power among the first carrier and the second carrier indicates an increase in transmission power when the threshold set based on The gist is to stop the processing to increase the transmission power of a carrier with high transmission power.
- the transmission power difference is the maximum transmission power difference.
- the power control information corresponding to the carrier with low transmission power among the first carrier and the second carrier indicates a decrease in transmission power when the threshold set based on The gist is to stop the process of reducing the transmission power of carriers with low transmission power.
- the transmission power difference is the maximum transmission power difference.
- the power control information corresponding to the carrier having the higher transmission power instructs to increase the transmission power, and the transmission power is increased.
- the gist is to increase both the transmission power of the first carrier and the second carrier when the power control information corresponding to the low carrier instructs to decrease the transmission power.
- the transmission power difference is the maximum transmission power difference.
- the power control information corresponding to the carrier having the higher transmission power instructs to increase the transmission power, and the transmission power is increased.
- the gist is that when the power control information corresponding to a low carrier indicates a decrease in transmission power, the transmission power of both the first carrier and the second carrier is decreased.
- One feature of the present invention is that in the above-described feature of the present invention, the transmission power difference is calculated.
- the communication method further includes the step of controlling the transmission power of the first carrier or the second carrier. If it is determined that the transmission power difference is increasing, the first carrier or the second carrier is determined. It is necessary to control the transmission power of the first carrier or the second carrier without following the power control information corresponding to this carrier.
- One feature of the present invention is that communication is performed by a multicarrier using at least a first carrier and a second carrier having a predetermined frequency interval and adjacent to the first carrier.
- the first wireless communication terminal according to the power control information generated by the wireless base station connected via the first carrier based on the reception quality of the uplink data using the first carrier.
- the transmission power of the carrier is controlled, and according to the power control information generated by the radio base station connected via the second carrier based on the reception quality of the uplink data using the second carrier
- a transmission power control unit (transmission power control unit 21) that controls transmission power of the second carrier, a transmission power difference calculation unit that calculates a transmission power difference between the first carrier and the second carrier (transmission) Power difference calculator 22 )
- the transmission power difference calculated by the transmission power difference calculation unit determines whether or not the transmission power difference exceeds a maximum transmission power difference allowed between the first carrier and the second carrier.
- a transmission power difference determination unit (transmission power difference calculation unit 22), and the transmission power control unit sets the first carrier or the second carrier when the transmission power difference exceeds the maximum transmission power difference.
- the gist is to control the transmission power of the first carrier or the second carrier while keeping the transmission power difference within the maximum transmission power difference without following the corresponding power control information.
- One feature of the present invention is that in the above-described feature of the present invention, when the transmission power control unit exceeds a threshold set based on the maximum transmission power difference, Among the first carrier and the second carrier, when the power control information corresponding to the carrier with high transmission power instructs to increase the transmission power, the transmission power is high V, and the transmission power of the carrier is increased. The gist is to stop the processing.
- One feature of the present invention is that in the above-described feature of the present invention, when the transmission power control unit exceeds a threshold set based on the maximum transmission power difference, Of the first carrier and the second carrier, when the power control information corresponding to the carrier with low transmission power indicates a decrease in transmission power, the transmission power decreases the transmission power of the low V ⁇ carrier. The gist is to stop the processing.
- One feature of the present invention is that in the above-described feature of the present invention, when the transmission power control unit exceeds a threshold set based on the maximum transmission power difference, Of the first carrier and the second carrier, the power control information corresponding to the carrier having the higher transmission power instructs to increase the transmission power, and the power control information corresponding to the carrier having the lower transmission power is the transmission power.
- the gist is to increase both the transmission power of the first carrier and the second carrier when a decrease is instructed.
- One feature of the present invention is that in the above-described feature of the present invention, when the transmission power control unit exceeds a threshold set based on the maximum transmission power difference, Of the first carrier and the second carrier, the power control information corresponding to the carrier having the higher transmission power instructs to increase the transmission power, and the power control information corresponding to the carrier having the lower transmission power is the transmission power.
- the gist is to reduce both the transmission power of the first carrier and the second carrier when a decrease is instructed.
- the transmission power difference calculation unit calculates the transmission power difference at a predetermined cycle, and the transmission power difference calculation unit performs the predetermined cycle.
- the wireless communication terminal further includes a power difference determination unit (transmission power difference determination unit 24) for determining whether or not the transmission power difference is increased based on the transmission power difference calculated in When the transmission power control unit determines that the transmission power difference is increased by the power difference determination unit, the transmission power control unit does not follow the power control information corresponding to the first carrier or the second carrier.
- the gist is to control transmission power of the first carrier or the second carrier.
- a radio communication method and a radio communication terminal capable of continuing multi-carrier communication while suppressing interference between adjacent carriers having a predetermined frequency interval can be provided.
- FIG. 1 is a diagram showing an overall schematic configuration of a communication system 300 according to the first embodiment of the present embodiment.
- FIG. 2 is a diagram showing an upstream frequency band according to the first embodiment of the present invention.
- FIG. 3 is a block diagram of the radio communication terminal 10 according to the first embodiment of the present invention.
- FIG. 4 is a functional block configuration diagram of the control unit 20 according to the first embodiment of the present invention.
- FIG. 5 is a flowchart showing the operation of the wireless communication terminal 10 according to the first embodiment of the present invention (part 1).
- FIG. 6 is a flowchart showing the operation of the wireless communication terminal 10 according to the first embodiment of the present invention (part 2).
- FIG. 7 is a flowchart showing the operation of the wireless communication terminal 10 according to the first embodiment of the present invention (part 3).
- FIG. 8 is a flowchart showing the operation of the wireless communication terminal 10 according to the first embodiment of the present invention (part 4).
- FIG. 9 is a functional block configuration diagram of a control unit 20 according to the second embodiment of the present invention.
- FIG. 10 is a diagram for explaining calculation of an estimated curve difference (difference directly calculated by an estimated curve equation for each carrier) according to the second embodiment of the present invention.
- FIG. 11 is a flowchart showing the operation of the radio communication terminal 10 according to the second embodiment of the present invention.
- FIG. 1 shows an overall schematic configuration of a communication system 300 according to the first embodiment of the present embodiment.
- the communication system 300 includes a plurality of wireless communication terminals 10 (wireless communication terminals 10a to 10c) and a plurality of wireless base stations 100 (wireless base stations 100a and radio).
- the wireless communication terminal 10 transmits uplink data to the radio base station 100 using the uplink frequency band allocated for uplink data transmission. Specifically, the uplink frequency band is divided into a plurality of carriers. Radio communication terminal 10 transmits uplink data to radio base station 100 by bundling and using a plurality of carriers in an upper layer (multicarrier).
- the radio communication terminal 10 receives the downlink data from the radio base station 100 using the downlink frequency band assigned to the transmission of the downlink data. Specifically, the downlink frequency band is divided into a plurality of carriers. Then, the radio communication terminal 10 receives downlink data from the radio base station 100 by using a plurality of carriers bundled in an upper layer (multicarrier).
- the radio communication terminal 10 may communicate with a single radio base station 100 like the radio communication terminal 10a and the radio communication terminal 10c. Further, the radio communication terminal 10 may communicate with a plurality of radio base stations 100 like the radio communication terminal 10b.
- the radio base station 100 receives the uplink data from the radio communication terminal 10 using the uplink frequency band assigned to receive the uplink data. Also, the radio base station 100 transmits the downlink data to the radio communication terminal 10 using the downlink frequency band assigned for the transmission of the downlink data.
- Base station control apparatus 200 manages communication performed between radio communication terminal 10 and radio base station 100.
- the base station control device 200 performs handoff processing for switching the radio base station 100 with which the radio communication terminal 10 communicates.
- radio communication terminal 10 performs open-loop control for controlling the transmission power of uplink data based on the reception power of downlink data received from radio base station 100. Further, the radio communication terminal 10 performs closed loop control for controlling the transmission power of the uplink data based on the power control information received from the radio base station 100.
- the power control information is information generated based on the reception quality (for example, signal to interference ratio (SIR)) of the uplink data received by the radio base station 100 from the radio communication terminal 10.
- SIR signal to interference ratio
- FIG. 2 shows an uplink frequency band according to the first embodiment of the present invention.
- the upstream frequency band is divided into a plurality of carriers (carrier # 1 to carrier #n).
- the center frequency of each carrier is f (l) to f (n), respectively.
- the center frequencies of the carriers are adjacent to each other with a predetermined frequency interval (for example, 1.25 MHz). In the following, two carriers having adjacent center frequencies are referred to as adjacent carriers.
- FIG. 3 is a functional block configuration diagram showing the radio communication terminal 10 according to the first embodiment of the present invention. Since the wireless communication terminal 10a to the wireless communication terminal 10c have the same configuration, these will be collectively referred to as the wireless communication terminal 10 below.
- the wireless communication terminal 10 includes an antenna 11, an RF / IF converter 12, a power amplifier 13, an audio input / output unit 14, a video input / output unit 15, and codec processing.
- a unit 16, a baseband processing unit 17, an operation unit 18, a memory 19, and a control unit 20 are included.
- the antenna 11 receives a signal (reception signal) transmitted by the radio base station 100.
- the antenna 11 transmits a signal (transmission signal) to the radio base station 100.
- the RF / IF converter 12 receives the frequency (Radio F) of the received signal received by the antenna 11. requency (RF)) is converted to a frequency (Intermediate Frequency (IF)) determined by the baseband processing unit 17.
- the RF / IF converter 12 converts the frequency (IF) of the transmission signal acquired from the baseband processing unit 17 into a frequency (RF) used in wireless communication.
- the RF / IF converter 12 inputs the transmission signal converted into the radio frequency (RF) to the power amplifier 13.
- the power amplifier 13 amplifies the transmission signal acquired from the RF / IF converter 12.
- the amplified transmission signal is input to the antenna 11.
- the voice input / output unit 14 includes a microphone 14a that collects voice and a speaker 14b that outputs voice.
- the microphone 14a is a codec processing unit that converts an audio signal based on the collected audio 1
- the speaker 14b outputs audio based on the audio signal acquired from the codec processing unit 16.
- the video input / output unit 15 includes a camera 15a that captures an image of a subject and a display unit 15b that displays characters, video, and the like.
- the camera 15a inputs a video signal to the codec processing unit 16 based on the captured video (still image or moving image).
- the display unit 15b displays a video based on the video signal acquired from the codec processing unit 16.
- the display unit 15b also displays characters input using the operation unit 18.
- the codec processing unit 16 processes the audio signal according to a predetermined encoding method (for example, EVRC (Enhanced Variable Rate Codec), AMR (Advanced Multi Rate Codec), or G.729 defined by ITU-T).
- a predetermined encoding method for example, EVRC (Enhanced Variable Rate Codec), AMR (Advanced Multi Rate Codec), or G.729 defined by ITU-T.
- the audio codec processing unit 16a performs encoding and decoding
- the video codec processing unit 16b performs encoding and decoding of a video signal in accordance with a predetermined encoding method (for example, MPEG-4).
- the audio codec processing unit 16a encodes the audio signal acquired from the audio input / output unit 14.
- the audio codec processing unit 16a decodes the audio signal acquired from the baseband processing unit 17.
- the video codec processing unit 16b encodes the video signal acquired from the video input / output unit 15. Further, the video codec processing unit 16b decodes the video signal obtained from the baseband processing unit 17.
- the baseband processing unit 17 modulates a transmission signal and demodulates a reception signal according to a predetermined modulation scheme (QPSK or 16QAM) or the like. Specifically, the baseband processing unit 17 Modulates baseband signals such as audio and video signals obtained from the deck processor 16. The modulated baseband signal (transmission signal) is input to the RF / IF converter 12. Further, the baseband processing unit 17 demodulates the received signal acquired from the RF / IF converter 12. The demodulated received signal (baseband signal) is input to the codec processing unit 16
- the baseband processing unit 17 modulates information generated by the control unit 20.
- the modulated information (transmission signal) is input to the RF / IF converter 12. Further, the baseband processing unit 17 demodulates the received signal acquired from the RF / IF converter 12. The demodulated received signal is input to the control unit 20.
- the operation unit 18 is a key group composed of input keys for inputting characters, numbers, etc., response keys for answering incoming calls (calling), outgoing keys for outgoing calls (calling), and the like. . Further, when each key is pressed, the operation unit 18 inputs an input signal corresponding to the pressed key to the control unit 20.
- the memory 19 stores a program for controlling the operation of the wireless communication terminal 10, various data such as an outgoing / incoming history and an address book.
- the memory 19 includes, for example, a flash memory that is a nonvolatile semiconductor memory, an SRAM (Static Random Access Memory) that is a volatile semiconductor memory, or the like.
- the control unit 20 controls the operation of the wireless communication terminal 10 (video input / output unit 15, codec processing unit 16, baseband processing unit 17, etc.) according to the program stored in the memory 19.
- FIG. 4 is a functional block configuration diagram showing the control unit 20 according to the first embodiment of the present invention.
- control unit 20 includes a transmission power control unit 21, a transmission power difference calculation unit 22, and a communication control unit 23.
- the transmission power control unit 21 controls the transmission power of the uplink data for each carrier. Specifically, the transmission power control unit 21 sets the transmission power of the uplink data based on the reception quality (for example, SIR) of the downlink data received from the radio base station 100 that is the transmission destination of the uplink data. Control (open loop control). [0052] Further, the transmission power control unit 21 controls the transmission power of the uplink data based on the power control information received from the radio base station 100 that is the transmission destination of the uplink data (closed loop control). Note that the power control information is information generated by the radio base station 100 based on the reception quality (eg, SIR) of uplink data as described above. The power control information requests a reduction or increase in transmission power of uplink data.
- the reception quality for example, SIR
- the transmission power control unit 21 obtains from the communication control unit 23 instruction information that instructs to control the transmission power of the uplink data without following the power control information
- the transmission power control unit 21 The transmission power of the adjacent carrier (uplink data) is controlled according to the instruction information acquired from the communication control unit 23 while keeping the transmission power difference within the maximum transmission power difference.
- the transmission power difference calculation unit 22 determines the difference in the transmission power of uplink data for adjacent carriers.
- transmission power difference (Hereinafter, transmission power difference) is calculated. Further, the transmission power difference calculation unit 22 determines whether or not the transmission power difference between the adjacent carriers exceeds the threshold set based on the maximum transmission power difference (MaxRLTxPwrDiff) allowed between the adjacent carriers. .
- the threshold set based on the maximum transmission power difference may be the maximum transmission power difference itself, and a value smaller than the maximum transmission power difference (for example, a predetermined ratio (0.9) is set to the maximum). It may be a value obtained by multiplying the transmission power difference.
- the transmission power difference calculation unit 22 determines that the transmission power difference between adjacent carriers is the maximum transmission power difference when the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference.
- the communication control unit 23 is notified that the threshold set based on the above has been exceeded.
- the communication control unit 23 When notified that the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference, the communication control unit 23 does not follow the power control information and performs uplink processing. Instruction information for instructing to control the transmission power of data is input to the transmission power control unit 21.
- the instruction information is an instruction to maintain the transmission power without being changed when the power control information corresponding to the carrier having the higher transmission power among the adjacent carriers instructs to increase the transmission power. Even if it is information to do.
- the instruction information is maintained without changing the transmission power when the power control information corresponding to the carrier having the lower transmission power among the adjacent carriers instructs the reduction of the transmission power. Even if it is information to instruct.
- the power control information corresponding to a carrier having a high transmission power among the adjacent carriers instructs the increase of the transmission power
- the power control information corresponding to a carrier having a low transmission power among the adjacent carriers May be information instructing to increase both the transmission power of adjacent carriers when instructing to decrease the transmission power.
- power control information corresponding to a carrier having high transmission power among adjacent carriers instructs to increase transmission power
- power control corresponding to a carrier having low transmission power among adjacent carriers when the information indicates a decrease in transmission power, it may be information instructing to decrease both the transmission power of adjacent carriers.
- the communication control unit 23 Instruction information for instructing to increase both the transmission power of adjacent carriers is input to the transmission power control unit 21.
- the communication control unit 23 transmits the transmission power of the adjacent carrier.
- the instruction information for instructing to decrease both is input to the transmission power control unit 21.
- 5 to 8 are flowcharts showing the operation of the radio communication terminal 10 according to the first embodiment of the present invention.
- the wireless communication terminal 10 transmits uplink data to the radio base station 100a using the carrier # 1, and transmits uplink data to the radio base station 100b using the carrier # 2. To do.
- the main process of transmission power control is repeatedly executed at a predetermined cycle.
- radio communication terminal 10 measures the reception quality of downlink data for carrier # 1. Specifically, the wireless communication terminal 10 Then, the reception quality of the downlink data received from radio base station 100a that is the transmission destination of the uplink data to be transmitted using carrier # 1 is measured.
- radio communication terminal 10 measures the reception quality of downlink data for carrier # 2. Specifically, the radio communication terminal 10 measures the reception quality of the downlink data received from the radio base station 100b that is the transmission destination of the uplink data to be transmitted using the carrier # 2.
- the radio communication terminal 10 determines the transmission power of the uplink data to be transmitted using the carrier # 1 by open loop control. Specifically, radio communication terminal 10 determines the transmission power of uplink data to be transmitted using carrier # 1, based on the reception quality measured in step 10.
- the radio communication terminal 10 determines the transmission power of the uplink data to be transmitted using the carrier # 2 by open loop control. Specifically, radio communication terminal 10 determines the transmission power of uplink data to be transmitted using carrier # 2, based on the reception quality measured in step 11.
- the radio communication terminal 10 receives power control information for carrier # 1. Specifically, the radio communication terminal 10 receives power control information from the radio base station 100a that is a transmission destination of uplink data to be transmitted using carrier # 1. Note that the power control information is information generated by the radio base station 100a based on the reception quality of the uplink data transmitted using carrier # 1.
- step 15 the radio communication terminal 10 adjusts the transmission power of the uplink data to be transmitted using the carrier # 1 by the closed loop control. Specifically, the radio communication terminal 10 adjusts the transmission power of the uplink data determined in step 12 based on the power control information received in step 14.
- radio communication terminal 10 transmits uplink data using carrier # 1 with transmission power determined by open loop control and closed loop control.
- the radio communication terminal 10 receives the power control information for the carrier # 2. Specifically, the radio communication terminal 10 receives power control information from the radio base station 100b that is a transmission destination of uplink data to be transmitted using the carrier # 2. Electricity The control information is information generated by the radio base station 100b based on the reception quality of the uplink data transmitted using the carrier # 2.
- radio communication terminal 10 adjusts the transmission power of the uplink data to be transmitted using carrier # 2 by closed loop control. Specifically, the radio communication terminal 10 adjusts the transmission power of the uplink data determined in step 13 based on the power control information received in step 16.
- radio communication terminal 10 transmits uplink data using carrier # 2 with transmission power determined by open loop control and closed loop control.
- step 15 or step 17 described above closed loop control processing (1)
- a carrier whose transmission power is controlled by the closed loop control process is referred to as a controlled carrier.
- the radio communication terminal 10 determines the difference in transmission power of uplink data (transmission power) for adjacent carriers (carrier # 1 and carrier # 2). difference
- step 21 the radio communication terminal 10 determines whether or not the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference (MaxRLTxPwrDiff). When the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 22. On the other hand, if the transmission power difference between adjacent carriers does not exceed the threshold set based on the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 25.
- MaxRLTxPwrDiff the maximum transmission power difference
- the threshold set based on the maximum transmission power difference is a value smaller than the maximum transmission power difference (for example, a predetermined ratio) as described above. (0. 9) multiplied by the maximum transmission power difference)!
- step 22 the radio communication terminal 10 determines whether or not the control target carrier is a carrier with high transmission power included in an adjacent carrier. When the controlled carrier is a carrier with high transmission power, the radio communication terminal 10 proceeds to the process of step 23. On the other hand, the radio communication terminal 10 is a carrier whose control target carrier is not a carrier with high transmission power. If YES, go to step 25.
- step 23 the radio communication terminal 10 determines whether or not the power control information corresponding to the control target carrier is information for instructing an increase in transmission power. If the power control information is information for instructing an increase in transmission power, the radio communication terminal 10 proceeds to the process of step 24. On the other hand, when the power control information is information for instructing a decrease in transmission power, the radio communication terminal 10 proceeds to the process of step 25.
- step 24 the radio communication terminal 10 does not change the transmission power of the carrier to be controlled without following the power control information instructing to increase the transmission power.
- wireless communication terminal 1 wireless communication terminal 1
- 0 may reduce the transmission power of the carrier to be controlled! /.
- step 25 the radio communication terminal 10 controls the transmission power of the carrier to be controlled according to the power control information.
- step 15 or step 17 described above closed loop control processing (2)
- the radio communication terminal 10 determines the difference in transmission power of uplink data (transmission power) for adjacent carriers (carrier # 1 and carrier # 2). difference
- step 31 the radio communication terminal 10 determines whether or not the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference (MaxRLTxPwrDiff). When the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 32. On the other hand, if the transmission power difference between adjacent carriers does not exceed the threshold set based on the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 35.
- MaxRLTxPwrDiff the maximum transmission power difference
- the threshold set based on the maximum transmission power difference is a value smaller than the maximum transmission power difference (for example, a predetermined ratio) as described above. (0. 9) multiplied by the maximum transmission power difference)!
- step 32 the radio communication terminal 10 determines whether or not the control target carrier is a carrier with low transmission power included in the adjacent carrier. If the control target carrier is a carrier with low transmission power, the radio communication terminal 10 proceeds to the process of step 33. one On the other hand, when the control target carrier is a carrier other than the carrier with low transmission power, the radio communication terminal 10 proceeds to the process of step 35.
- step 33 the radio communication terminal 10 determines whether or not the power control information corresponding to the control target carrier is information for instructing a decrease in transmission power. If the power control information is information for instructing a decrease in transmission power, the radio communication terminal 10 proceeds to the process of step 34. On the other hand, when the power control information is information for instructing an increase in transmission power, the radio communication terminal 10 proceeds to the process of step 35.
- step 34 the radio communication terminal 10 does not change the transmission power of the carrier to be controlled without following the power control information instructing a decrease in the transmission power.
- wireless communication terminal 1 wireless communication terminal 1
- 0 may increase the transmission power of the carrier to be controlled! /.
- step 35 the radio communication terminal 10 controls the transmission power of the controlled carrier according to the power control information.
- the carrier to be controlled is one of the adjacent carriers.
- the control target carriers are both adjacent carriers. That is, in closed loop control processing (3)
- Steps 15 and 17 described above are performed simultaneously.
- the radio communication terminal 10 determines the difference (transmission power) of uplink data transmission power for adjacent carriers (carrier # 1 and carrier # 2). difference
- step 41 the radio communication terminal 10 determines whether or not the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference (MaxRLTxPwrDiff). When the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 42. On the other hand, if the transmission power difference between adjacent carriers does not exceed the threshold set based on the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 49.
- MaxRLTxPwrDiff the maximum transmission power difference
- step 42 the radio communication terminal 10 has a high transmission power included in the adjacent carrier. It is determined whether or not the power control information corresponding to a large carrier is information for instructing an increase in transmission power. When the power control information corresponding to the carrier with high transmission power is information for instructing an increase in transmission power, the radio communication terminal 10 proceeds to the process of step 43. On the other hand, when the power control information corresponding to the carrier having high transmission power is information instructing a decrease in transmission power, the radio communication terminal 10 proceeds to the process of step 49.
- step 43 the radio communication terminal 10 determines whether or not the power control information corresponding to the carrier with low transmission power included in the adjacent carrier is information for instructing a decrease in transmission power.
- the radio communication terminal 10 proceeds to the process of step 44.
- the radio communication terminal 10 proceeds to the process of step 49.
- step 44 the radio communication terminal 10 determines whether or not the transmission power of a carrier with low transmission power included in an adjacent carrier is smaller than a predetermined threshold. When the transmission power is smaller than the predetermined threshold, the radio communication terminal 10 proceeds to the process of step 45. On the other hand, if the transmission power is greater than or equal to the predetermined threshold, the process proceeds to step 47.
- step 45 the radio communication terminal 10 increases the transmission power of the carrier with high transmission power according to the power control information (UP) corresponding to the carrier with high transmission power (for example, one stage).
- UP power control information
- step 46 the radio communication terminal 10 increases the transmission power of the carrier having the low transmission power without following the power control information (DOWN) corresponding to the carrier having the low transmission power (for example, one stage). .
- DOWN power control information
- step 47 the radio communication terminal 10 reduces the transmission power of the carrier with high transmission power (eg, one step) without complying with the power control information (UP) corresponding to the carrier with high transmission power. ).
- step 48 the radio communication terminal 10 decreases the transmission power of the carrier having the low transmission power according to the power control information (DOWN) corresponding to the carrier having the low transmission power (for example, one stage).
- DOWN power control information
- step 49 the radio communication terminal 10 uses the power corresponding to each adjacent carrier.
- Each of the transmission powers of adjacent carriers is controlled according to the control information.
- the communication control unit 23 determines that the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference (MaxRLTxPwrDiff)
- Instruction information for instructing to control the transmission power of the adjacent carrier is input to the transmission power control unit 21 without following the power control information corresponding to the carrier. Further, the transmission power control unit 21 controls the transmission power of the adjacent carrier based on the instruction information.
- the transmission power control unit 21 sets a carrier having a high transmission power. Maintain transmission power unchanged. Similarly, the transmission power control unit 21 does not change the transmission power of the carrier with low transmission power when the power control information corresponding to the carrier with low transmission power included in the adjacent carrier instructs to reduce the transmission power. maintain
- multi-carrier communication can be continued while suppressing interference between adjacent carriers having a predetermined frequency interval.
- the transmission power control unit 21 uses the power control information corresponding to each adjacent carrier to increase the transmission power difference between adjacent carriers. If it is information to be directed, increase both the transmission power of adjacent carriers.
- the transmission power control unit controls the radio communication terminal 10 according to the first embodiment of the present invention.
- the transmission power of the adjacent carriers is reduced together.
- the radio communication terminal 10 uses the power control information when the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference. To determine whether or not to control the transmission power of the adjacent carrier.
- the radio communication terminal 10 determines whether or not the transmission power difference between adjacent carriers has increased, and the transmission power difference between adjacent carriers has increased. When the transmission power difference between adjacent carriers exceeds a threshold set based on the maximum transmission power difference, it is determined whether or not the transmission power of the adjacent carrier is controlled according to the power control information.
- FIG. 9 is a functional block configuration diagram showing the control unit 20 of the wireless communication terminal 10 according to the second embodiment of the present invention. Note that in FIG. 9, the same components as those in FIG. 4 are given the same reference numerals.
- radio communication terminal 10 includes transmission power difference determination unit 24 in addition to transmission power control unit 21, transmission power difference calculation unit 22, and communication control unit 23.
- the transmission power difference calculation unit 22 calculates the transmission power difference between adjacent carriers every predetermined period (for example, the period in which the transmission power control unit 21 performs transmission power control).
- the transmission power difference determination unit 24 determines whether or not the transmission power difference between adjacent carriers calculated by the transmission power difference calculation unit 22 every predetermined period is increasing. Specifically, the transmission power difference determination unit 24 is based on the transmission power of the uplink data, and is an estimated curve equation (hereinafter referred to as an estimation curve equation) indicating a situation in which the transmission power of the uplink data changes on the time axis. ) Is calculated for each adjacent carrier. Subsequently, the transmission power difference determination unit 24 determines whether or not the difference between the values calculated by the respective estimated curve equations for a predetermined time (hereinafter, estimated curve difference) exceeds the estimated curve difference threshold over a predetermined period. Determine whether.
- the transmission power difference determination unit 24 has an estimated curve difference between adjacent carriers that exceeds the estimated curve threshold over a predetermined period. In this case, the communication control unit 23 is notified that the estimated curve difference between adjacent carriers has exceeded the estimated curve threshold over a predetermined period.
- the notch period is determined by the notch interval calculated based on the reception strength and reception quality (SIR). Specifically, the notch period includes a notch interval before the peak point and a notch interval after the peak point of the transmission power estimation curve. Further, when the estimated curve difference between adjacent carriers exceeds the estimated curve threshold for a predetermined period, the radio communication terminal 10 controls the transmission power of at least one of the adjacent carriers without following the power control information. To do.
- the transmission power difference determination unit 24 determines whether or not the estimated curve difference “ ⁇ ” calculated by the equations (1) to (4) exceeds the estimated curve difference threshold ( ⁇ ) over a predetermined period. Power.
- the estimated curve difference “P” is a value calculated by the estimated curve equation “M (t)” and the downward estimated value.
- the transmission power difference determination unit 24 determines that the estimated curve difference “P” is an estimated curve during the notch period.
- the communication control unit 23 sets that the estimated curve difference between adjacent carriers exceeds the estimated curve threshold value over a predetermined period, and the transmission power difference between adjacent carriers is set based on the maximum transmission power difference. When notified that the threshold has been exceeded, it is determined whether to control the transmission power of the adjacent carrier according to the power control information.
- FIG. 11 is a flowchart showing the operation of the radio communication terminal 10 according to the second embodiment of the present invention. Note that the closed loop control process shown in FIG. 11 is executed instead of the closed loop control process shown in FIG. 9 described above.
- the wireless communication terminal 10 Assume that uplink data is transmitted to radio base station 100a using carrier # 1, and uplink data is transmitted to radio base station 100b using carrier # 2. Further, it is assumed that the transmission power of carrier # 1 is larger than the transmission power of carrier # 2.
- step 60 the radio communication terminal 10 has a transmission power of high V, based on the transmission power of the uplink data transmitted via the carrier # 1,! /, Calculate the estimated curve formula for carrier # 1.
- step 61 the radio communication terminal 10 uses the estimated curve formula (or the lower estimated curve) of the carrier # 2 based on the transmission power of the uplink data transmitted via the carrier # 2 having a low transmission power. Formula) is calculated.
- step 62 the radio communication terminal 10 calculates the estimated curve equation of carrier # 1 calculated in step 60 and the estimated curve equation (or downward estimated curve equation) of carrier # 2 calculated in step 61. Based on the above, it is determined whether the transmission power difference between carrier # 1 and carrier # 2 exceeds the estimated curve difference threshold value. Specifically, the radio communication terminal 10 determines the difference (estimated curve) between the value calculated by the estimated curve equation of carrier # 1 and the value calculated by the estimated curve equation of carrier # 2 (or the lower estimated curve equation). Calculate the difference. Subsequently, the wireless communication terminal 10 determines whether or not the estimated curve difference exceeds the estimated curve difference threshold over a predetermined period.
- the radio communication terminal 10 proceeds to the process of step 63.
- the wireless communication terminal 10 proceeds to the process of step 71.
- radio communication terminal 10 determines whether or not the transmission power difference between carrier # 1 and carrier # 2 exceeds a threshold set based on the maximum transmission power difference. When the transmission power difference exceeds the threshold set based on the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 64. On the other hand, in the case where the transmission power difference exceeds the threshold set based on the maximum transmission power difference! /, N! /, The wireless communication terminal 10 proceeds to the process of step 71.
- Step 64 to Step 71 the wireless communication terminal 10
- the power control information corresponding to the adjacent carrier is information instructing an increase in the transmission power difference
- radio communication terminal 10 controls the transmission power of the adjacent carrier without following the power control information.
- the power control information corresponding to the adjacent carrier is not information indicating an increase in the transmission power difference
- radio communication terminal 10 controls the transmission power of the adjacent carrier according to the power control information.
- the communication control unit 23 is not simply a case where the transmission power difference between adjacent carriers exceeds the threshold set based on the maximum transmission power difference.
- transmission of the adjacent carrier is performed according to the power control information. It is determined whether or not power is controlled.
- the transmission power of the carrier temporarily increases due to open-loop control or closed-loop control as reception quality deteriorates due to the influence of fading or the like.
- the transmission power difference between adjacent carriers temporarily exceeds the threshold set based on the maximum transmission power difference, if the effect of fading is eliminated, the difference between adjacent carriers The transmission power difference is likely to be within the maximum transmission power difference.
- the power control information is used. Therefore, it is possible to prevent the normal closed loop control from being stopped unnecessarily.
- the predetermined threshold value is determined according to how far the center frequencies of the two carriers are separated. Specifically, the greater the distance between the center frequencies of the two carriers, the lower the degree of interference between the two carriers. Therefore, the predetermined threshold is set to a low value.
- step 64 to step 71 in the second embodiment may be replaced by the processing shown in FIG. 6 or FIG.
- the radio communication terminal may perform the transmission power control according to the above-described embodiment based on the power control information transmitted from the base station. Specifically, the radio communication terminal performs control or transmission power to maintain transmission power when the number of times of receiving power control information instructing an increase in transmission power is greater than the predetermined number of times within a predetermined period. Control may be performed to decrease. Similarly, the wireless communication terminal performs control for maintaining transmission power or control for increasing transmission power when the number of times of receiving power control information instructing a decrease in transmission power is greater than the predetermined number of times. Motole.
- the operation of the wireless communication terminal 10 according to the first to second embodiments described above can also be provided as a program executable on the computer.
- the radio communication method and the radio communication terminal according to the present invention have a predetermined frequency interval and continue multi-carrier communication while suppressing interference between adjacent carriers. Therefore, it is useful in wireless communication such as mobile communication.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US12/375,398 US8442574B2 (en) | 2006-07-28 | 2007-07-27 | Radio communication method and radio communication terminal |
CN200780028435.5A CN101496313B (zh) | 2006-07-28 | 2007-07-27 | 无线通信方法和无线通信终端 |
Applications Claiming Priority (2)
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JP2006-207247 | 2006-07-28 | ||
JP2006207247A JP4769657B2 (ja) | 2006-07-28 | 2006-07-28 | 無線通信方法及び無線通信端末 |
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WO2008013259A1 true WO2008013259A1 (fr) | 2008-01-31 |
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PCT/JP2007/064754 WO2008013259A1 (fr) | 2006-07-28 | 2007-07-27 | Procédé de communication sans fil et terminal de communication sans fil |
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US (1) | US8442574B2 (ja) |
JP (1) | JP4769657B2 (ja) |
KR (1) | KR100995191B1 (ja) |
CN (1) | CN101496313B (ja) |
WO (1) | WO2008013259A1 (ja) |
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WO2010145987A1 (en) * | 2009-06-17 | 2010-12-23 | Telefonaktiebolaget L M Ericsson (Publ) | Transmit power control of channels transmitted in different frequency regions |
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- 2007-07-27 KR KR1020097004054A patent/KR100995191B1/ko not_active IP Right Cessation
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Cited By (5)
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WO2010145987A1 (en) * | 2009-06-17 | 2010-12-23 | Telefonaktiebolaget L M Ericsson (Publ) | Transmit power control of channels transmitted in different frequency regions |
CN102804871A (zh) * | 2009-06-17 | 2012-11-28 | 瑞典爱立信有限公司 | 不同频率区域中传送的信道的传送功率控制 |
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Also Published As
Publication number | Publication date |
---|---|
JP2008035290A (ja) | 2008-02-14 |
KR100995191B1 (ko) | 2010-11-17 |
KR20090046882A (ko) | 2009-05-11 |
US8442574B2 (en) | 2013-05-14 |
US20100016010A1 (en) | 2010-01-21 |
CN101496313B (zh) | 2013-02-13 |
CN101496313A (zh) | 2009-07-29 |
JP4769657B2 (ja) | 2011-09-07 |
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