WO2008001858A1 - Procédé de radiocommunication et terminal de radiocommunication - Google Patents
Procédé de radiocommunication et terminal de radiocommunication Download PDFInfo
- Publication number
- WO2008001858A1 WO2008001858A1 PCT/JP2007/063023 JP2007063023W WO2008001858A1 WO 2008001858 A1 WO2008001858 A1 WO 2008001858A1 JP 2007063023 W JP2007063023 W JP 2007063023W WO 2008001858 A1 WO2008001858 A1 WO 2008001858A1
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- WO
- WIPO (PCT)
- Prior art keywords
- carrier
- transmission power
- power difference
- data rate
- difference
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/22—Negotiating communication rate
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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
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
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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
Definitions
- the present invention relates to a radio communication method in the uplink direction by a multi-carrier using a plurality of carriers, a radio communication method and a radio communication terminal for executing communication using multi-carriers.
- 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, eg, 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), the transmission power difference may not be maintained 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 force with a predetermined frequency interval. Do When performing communication using the second carrier and approaching the second radio base station, the radio communication terminal communicates with the first radio base station using the first carrier. In order to maintain communication, it is necessary to increase the transmission power of 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.
- 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.
- the transmission power value of the first carrier is set so as to decrease in accordance with a reduction in the data rate of data transmitted via the first carrier
- the second carrier The transmission power value of the first carrier is set to decrease in accordance with a reduction in the data rate of data transmitted via the second carrier, and the transmission power value of the first carrier and the second carrier
- the wireless communication method includes the step of reducing the data rate.
- One feature of the present invention is that, in the above-described feature of the present invention, in the step of calculating the transmission power difference, the transmission power difference is calculated at a predetermined period, and is calculated every predetermined period. The step of determining whether or not the transmission power difference is increasing based on the transmission power difference, and when it is determined that the transmission power difference is increasing, the first carrier and the second carrier The wireless communication method further includes the step of reducing the data rate transmitted through the carrier having a high transmission power value among the carriers.
- the first carrier and a multicarrier using at least a second carrier adjacent to the first carrier with a predetermined frequency interval are used in the uplink direction.
- the transmission power value of the first carrier is set to increase with an increase in the data rate of data transmitted via the first carrier
- the second carrier The transmission power value of the first carrier is set to increase with an increase in the data rate of data transmitted via the second carrier, and the transmission power value of the first carrier and the second carrier
- the gist is that the wireless communication method includes the step of increasing the data rate.
- the transmission power difference exceeds the maximum transmission power difference, a data rate transmitted via a carrier having a low transmission power value among the first carrier and the second carrier.
- the transmission power difference can be reduced while improving the data rate of a carrier having a low transmission power value.
- One feature of the present invention is that, in the above-described feature of the present invention, in the step of calculating the transmission power difference, the transmission power difference is calculated at a predetermined period, and is calculated every predetermined period. Based on the transmission power difference, whether or not the transmission power difference is increasing The data rate transmitted through a carrier having a low transmission power value among the first carrier and the second carrier when it is determined that the transmission power difference is increasing; And further including a step of increasing.
- One feature of the present invention is that in the above-mentioned feature of the present invention, the data rate of the first carrier with respect to the transmission power value of the first carrier and the transmission power value of the second carrier.
- the wireless communication method further includes the step of controlling the data rate of the first carrier or the second carrier based on the data rate of the second carrier with respect to the above.
- One feature of the present invention is that communication is performed by a multicarrier using at least a first carrier and a second carrier adjacent to the first carrier having a predetermined frequency interval.
- the transmission power value of the first carrier is set so as to decrease in accordance with a reduction in the data rate of data transmitted through the first carrier
- the second carrier The transmission power value of the carrier is set so as to decrease in accordance with a reduction in the data rate of data transmitted via the second carrier, and the transmission power value of the first carrier and the second carrier
- the transmission power difference calculation unit (transmission power difference calculation unit 22) that calculates the transmission power difference from the transmission power value of the carrier of the carrier, and the transmission power difference calculated by the transmission power difference calculation unit is the first power difference.
- the carrier and said Transmission power difference determination unit (transmission power difference calculation unit 22) for determining whether or not the maximum transmission power difference allowed between the two carriers is exceeded and the transmission power difference determination unit, the transmission power difference is determined by the transmission power difference determination unit.
- Communication control for reducing the data rate transmitted through a carrier having a high transmission power value out of the first carrier and the second carrier when it is determined that the maximum transmission power difference is exceeded.
- Section (communication control unit 23) is provided in a wireless communication terminal.
- the transmission power difference calculation unit calculates the transmission power difference at a predetermined cycle, and the transmission power difference calculation unit calculates the predetermined cycle.
- the wireless communication terminal further includes a power difference tendency determination unit (transmission power difference tendency determination unit 24) that determines whether or not the transmission power difference is increased based on the transmission power difference calculated for each And the communication control unit determines that the transmission power difference is widened by the power difference tendency determination unit, the first carrier and the second key.
- the gist is to reduce the data rate transmitted through a carrier having a high transmission power value among the carriers.
- 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 transmission power value of the first carrier is set so as to increase in accordance with an increase in the data rate of data transmitted through the first carrier, and the second carrier
- the transmission power value of the carrier is set so as to increase as the data rate of the data transmitted through the second carrier increases, and the transmission power value of the first carrier and the first carrier
- a transmission power difference calculating unit that calculates a transmission power difference from the transmission power value of the second carrier, and the transmission power difference calculated by the transmission power difference calculating unit between the first carrier and the second carrier In between A transmission power difference determination unit that determines whether or not the maximum transmission power difference allowed exceeds the maximum transmission power difference, and when the transmission power difference determination unit determines that the transmission power difference exceeds the maximum transmission power difference,
- the gist of the invention is that the wireless communication terminal includes a communication control unit that increases the data rate transmitted through the carrier
- the transmission power difference calculation unit calculates the transmission power difference at a predetermined cycle, and the transmission power difference calculation unit calculates the predetermined cycle.
- the wireless communication terminal further includes a power difference tendency determination unit that determines whether or not the transmission power difference is increasing based on the transmission power difference calculated every time, and the communication control unit includes the power difference When it is determined by the difference tendency determination unit that the transmission power difference is increased! /, It is transmitted via the carrier having the lower transmission power value among the first carrier and the second carrier. The gist is to increase the data rate.
- the communication control unit includes a data rate of the first carrier with respect to a transmission power value of the first carrier, and the second carrier.
- the gist is to control the data rate of the first carrier or the second carrier based on the data rate of the second carrier with respect to the transmission power value.
- FIG. 1 is a diagram showing an overall schematic configuration of a communication system 300 according to a 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 diagram showing an example of a table stored in the memory 19 according to the first embodiment of the present invention.
- FIG. 5 is a functional block configuration diagram of the control unit 20 according to the first embodiment of the present invention.
- FIG. 6 is a flowchart showing an operation of the radio communication terminal 10 according to the first embodiment of the present invention (part 1).
- FIG. 7 is a flowchart showing the operation of the wireless communication terminal 10 according to the first embodiment of the present invention (part 2).
- FIG. 8 is a flowchart showing the operation of the wireless communication terminal 10 according to the first embodiment of the present invention (part 3).
- 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 view for explaining calculation of an estimated curve difference 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. 12 is a diagram showing an example of carrier control according to the third embodiment of the present invention (part 1).
- FIG. 13 is a diagram showing an example of carrier control according to the third embodiment of the present invention (part 2).
- FIG. 14 is a diagram showing an example of carrier control according to the third embodiment of the present invention (part 3).
- FIG. 15 is a diagram showing an example of carrier control according to the third embodiment of the present invention (part 4).
- FIG. 16 is a flowchart showing an operation of the radio communication terminal 10 according to the third 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 radio communication terminal 10 transmits uplink data to the radio base station 100 using the uplink frequency band allocated to the 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).
- Radio communication terminal 10 receives downlink data from radio base station 100 using a downlink frequency band assigned to transmission of downlink data. Specifically, the downlink frequency band is divided into a plurality of carriers. The wireless communication terminal 10 By using a number of carriers bundled in the upper layer, the downlink data is transmitted to the radio base station 1
- 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.
- the wireless communication terminal 10 is a wireless communication terminal
- the radio base station 100 receives the uplink data from the radio communication terminal 10 using the uplink frequency band assigned to the transmission of 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.
- Base station controller 200 is a radio base station with which radio communication terminal 10 communicates
- the radio communication terminal 10 performs open loop control for controlling the transmission power of the uplink data based on the reception power of the downlink data received from the 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 uplink data received by the radio base station 100 from the radio communication terminal 10! .
- SIR signal to interference ratio
- the radio communication terminal 10 can change the data rate of the uplink data by changing the modulation scheme or the coding scheme.
- the radio communication terminal 10 has a table that associates the data rate of the uplink data with the offset value.
- the radio communication terminal 10 adds an offset value corresponding to the data rate of the uplink data to the transmission power determined by the open loop control or the closed loop control.
- uplink data transmission power is set to decrease in accordance with a reduction in uplink data rate. Conversely, the uplink data transmission power is set to increase as the uplink data rate increases. Has been.
- 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 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, they will be collectively referred to as the wireless communication terminal 10 below.
- the wireless communication terminal 10 includes an antenna 11, an RFZIF converter 12, a power amplifier 13, an audio input / output unit 14, a video input / output unit 15, and a codec processing unit 16.
- the antenna 11 receives a signal (received signal) transmitted by the radio base station 100.
- the antenna 11 transmits a signal (transmission signal) to the radio base station 100.
- the RFZIF converter 12 converts the frequency (Radio Frequency (RF)) of the received signal received by the antenna 11 into a frequency (Intermediate Frequency (IF)) handled by the baseband processing unit 17.
- the RFZIF 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 RFZIF converter 12 inputs the transmission signal converted to the radio frequency (RF) to the power amplifier 13.
- the noisy amplifier 13 amplifies the transmission signal acquired from the RFZIF conversion 12. Amplified The transmitted signal is input to the antenna 11.
- the voice input / output unit 14 includes a microphone 14a for collecting voice and a speaker 14b for outputting voice.
- the microphone 14a inputs an audio signal to the codec processing unit 16 based on the collected audio.
- 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 in accordance with 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.
- a predetermined coding 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 method (QPSK or 16QAM) or the like. Specifically, the baseband processing unit 17 modulates a baseband signal such as an audio signal or a video signal acquired from the codec processing unit 16. The modulated baseband signal (transmission signal) is input to the RFZIF converter 12. The baseband processing unit 17 demodulates the received signal acquired from the RFZIF transformation 12. The demodulated received signal (baseband signal) is input to the codec processing unit 16
- the baseband processing unit 17 modulates the information generated by the control unit 20. Modulated The received information (transmission signal) is input to the RFZIF converter 12. Further, the baseband processing unit 17 demodulates the reception signal acquired from the RFZIF 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 and numbers, 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 memory 19 has a table that associates the data rate of the uplink data with the offset value. For example, when the uplink data rate is 9.6 kbps (initial value), the offset value is not added to the transmission power determined by open loop control or closed loop control. On the other hand, when the data rate of the uplink data is 153.6 kbps, an offset value (13 dB) is added to the transmission power determined by open loop control or closed loop control.
- 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 and the like) according to a program stored in the memory 19.
- FIG. 5 is a functional block configuration diagram showing the control unit 20 according to an 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). [0058] Also, 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 uses the offset value determined by the communication control unit 23 according to the data rate of the uplink data to the transmission power of the uplink data determined by the open loop control or the closed loop control. Is added.
- 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 adjacent carriers exceeds the maximum transmission power difference (MaxRLTxPwrDiff) allowed between adjacent carriers. If the transmission power difference between adjacent carriers exceeds the maximum transmission power difference, the transmission power difference calculation unit 22 indicates that the transmission power difference between adjacent carriers exceeds the maximum transmission power difference. Notify 23.
- MaxRLTxPwrDiff maximum transmission power difference
- Communication control unit 23 determines the data rate of the uplink signal according to the radio state (for example, delay amount) between radio communication terminal 10 and radio base station 100, the type of application, and the like.
- the communication control unit 23 instructs the baseband processing unit 17 to change the modulation method according to the determined data rate, or instructs the codec processing unit 16 to change the encoding method according to the determined data rate. Or
- the communication control unit 23 changes the data rate of the uplink signal and stores it in the memory 19 Refer to the table, and determine the offset value according to the changed data rate.
- the communication control unit 23 reduces the data rate of the uplink signal transmitted via the carrier having the higher transmission power among the adjacent carriers, and responds to the reduced data rate. To determine the offset value.
- the communication control unit 23 increases the data rate of the uplink signal transmitted via the carrier having the lower transmission power among the adjacent carriers, and responds to the increased data rate. You can decide the offset value at the same time.
- FIG. 10 is a flowchart showing 10 operations.
- 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
- 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 transmits power control information for carrier # 1. Receive. 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.
- radio communication terminal 10 adjusts the transmission power of uplink data to be transmitted using carrier # 1 by 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.
- 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.
- the power 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 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.
- the wireless communication terminal 10 uses the carrier # 1 according to the wireless state (for example, delay amount) between the wireless communication terminal 10 and the wireless base station 100a, the type of application, and the like. A data rate of uplink data to be transmitted is determined.
- the radio communication terminal 10 uses the carrier # 2 according to the radio state (for example, delay amount) between the radio communication terminal 10 and the radio base station 100b, the type of application, and the like.
- a data rate of uplink data to be transmitted is determined.
- radio communication terminal 10 refers to the table stored in memory 19 and determines the offset value of carrier # 1 according to the data rate determined in step 18. Radio communication terminal 10 transmits uplink data using carrier # 1 with the power obtained by adding the offset value to the transmission power adjusted in step 15.
- the wireless communication terminal 10 refers to the table stored in the memory 19 Then, the offset value of carrier # 2 is determined according to the data rate determined in step 19. Radio communication terminal 10 transmits uplink data using carrier # 2 with the power obtained by adding the offset value to the transmission power adjusted in step 17.
- the transmission power control sub-process (1) is a process of interrupting the transmission power control main process at a predetermined cycle.
- radio communication terminal 10 calculates a difference in transmission power (transmission power difference) of uplink data for adjacent carriers (carrier # 1 and carrier # 2). To do.
- step 31 the radio communication terminal 10 determines whether or not the transmission power difference between adjacent carriers exceeds the maximum transmission power difference (MaxRLTxPwrDiff). If the transmission power difference between adjacent carriers exceeds the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 32. Further, when the transmission power difference between adjacent carriers does not exceed the maximum transmission power difference, the radio communication terminal 10 ends the transmission power control sub-process.
- MaxRLTxPwrDiff maximum transmission power difference
- the radio communication terminal 10 changes the data rate of the uplink data transmitted via the carrier having the lower transmission power among the adjacent carriers. Specifically, the radio communication terminal 10 increases the data rate of the uplink data transmitted via the carrier with low transmission power (for example, one step in the table stored in the memory 19).
- step 33 the radio communication terminal 10 changes the offset value of the carrier having the low transmission power among the adjacent carriers. Specifically, the radio communication terminal 10 increases the offset value in accordance with the change of the data rate in step 32 (for example, one level in the table stored in the memory 19).
- the transmission power control sub-process (2) is a process of interrupting the transmission power control main process at a predetermined cycle, as in the transmission power control sub-process (1).
- step 40 the radio communication terminal 10 calculates a difference in transmission power (transmission power difference) of uplink data for adjacent carriers (carrier # 1 and carrier # 2). To do. [0087] In step 41, the radio communication terminal 10 determines whether or not the transmission power difference between adjacent carriers exceeds the maximum transmission power difference (MaxRLTxPwrDiff). When the transmission power difference between adjacent carriers exceeds the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 42. Further, when the transmission power difference between adjacent carriers does not exceed the maximum transmission power difference, the radio communication terminal 10 ends the transmission power control sub-process.
- Maximum transmission power difference MaxRLTxPwrDiff
- the radio communication terminal 10 changes the data rate of the uplink data transmitted through the carrier having the higher transmission power among the adjacent carriers. Specifically, the radio communication terminal 10 reduces the data rate of the uplink data transmitted via the carrier with high transmission power (for example, one step in the table stored in the memory 19).
- step 43 the radio communication terminal 10 changes the offset value of the carrier having the higher transmission power among the adjacent carriers. Specifically, the radio communication terminal 10 reduces the offset value in accordance with the change of the data rate in step 42 (for example, one level in the table stored in the memory 19).
- the communication control unit 23 when the transmission power difference between adjacent carriers exceeds the maximum transmission power difference (MaxRLTxPwrDiff), among the adjacent carriers, the transmission power value By reducing the data rate of high carriers, it is possible to reduce the transmission power difference between neighboring carriers.
- MaxRLTxPwrDiff maximum transmission power difference
- the communication control unit 23 increases the data rate of the carrier having a low transmission power value among the adjacent carriers. This makes it possible to reduce the transmission power difference between adjacent carriers while improving the data rate of the carrier having a low transmission power value.
- the radio communication terminal 10 When the transmission power difference exceeds the maximum transmission power difference, the data rate and the offset value of the uplink data are changed.
- the radio communication terminal 10 determines whether or not the transmission power difference between adjacent carriers has increased, and increases the transmission power difference between adjacent carriers. If the transmission power difference between adjacent carriers exceeds the maximum transmission power difference, the data rate and the offset value of the uplink data are changed.
- FIG. 9 is a block diagram showing a radio communication terminal 10 according to the second embodiment of the present invention. It should be noted that in FIG. 9, components similar to those in FIG. 3 are given the same reference numerals.
- the radio communication terminal 10 includes a transmission power difference tendency determination unit 24 in addition to the transmission power control unit 21, the transmission power difference calculation unit 22, and the communication control unit 23.
- the transmission power difference calculation unit 22 calculates a transmission power difference between adjacent carriers for each predetermined period (for example, a period in which the transmission power control unit 21 performs transmission power control).
- the transmission power difference tendency determination unit 24 determines whether or not the transmission power difference calculation unit 22 has increased power between adjacent carriers calculated every predetermined period. Specifically, the transmission power difference trend determination unit 24 is based on the transmission power of the uplink data, and is an estimation curve equation (hereinafter, an estimation curve equation) indicating a tendency for the transmission power of the uplink data to change on the time axis. ) Is calculated for each adjacent carrier. Subsequently, the transmission power difference tendency determination unit 24 determines whether or not the difference between the values calculated by the respective estimated curve equations at a predetermined time (hereinafter, estimated curve difference) exceeds the estimated curve difference threshold over a predetermined period. Determine whether. The transmission power difference tendency determination unit 24 estimates the estimated curve difference between adjacent carriers over a predetermined period when the estimated curve difference between adjacent carriers exceeds the estimated curve threshold over a predetermined period. Notify the communication control unit 23 that the curve threshold is exceeded.
- an estimation curve equation indicating a tendency for the transmission power of the uplink data to change on the time axis
- the transmission power of carrier # 1 is the transmission power of carrier # 2. If it ’s bigger than power, think about it.
- the estimated curve equation “M (t)” is calculated by the following equation (2). 13 is career #
- the transmission power difference tendency determination unit 24 determines that the estimated curve difference "P" calculated by the equations (1) to (4) exceeds the estimated curve difference threshold (P) over a predetermined period. Judgment of power or not [0110] Note that the estimated curve difference "P" is the value calculated by the estimated curve equation "M (t)" and the downward estimate.
- the communication control unit 23 notifies that the estimated curve difference between adjacent carriers exceeds the estimated curve threshold value over a predetermined period and that the transmission power difference between adjacent carriers exceeds the maximum transmission power difference. If the data rate is changed, the data rate of the uplink signal is changed, and the offset value is determined according to the changed data rate with reference to the table stored in the memory 19.
- FIG. 11 is a flowchart showing the operation of the radio communication terminal 10 according to the second embodiment of the present invention.
- the transmission power control sub-process shown in FIG. 11 is executed in place of the transmission power control sub-process shown in FIGS.
- the radio 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. Furthermore, it is assumed that the transmission power of carrier # 1 is larger than the transmission power of carrier # 2.
- step 50 the radio communication terminal 10 determines the carrier # based on the transmission power of the uplink data transmitted via the carrier # 1 having a high transmission power.
- step 51 the radio communication terminal 10 determines the carrier curve # 2 based on the transmission power of the uplink data transmitted via the carrier # 2 with low transmission power! , The downward estimated curve formula) is calculated.
- radio communication terminal 10 uses carrier # 1's estimated curve equation calculated in step 50 and carrier # 2's estimated curve equation calculated in step 51 (or downward estimation). On the basis of the curve equation), it is determined whether or not the transmission power difference between carrier # 1 and carrier # 2 is increasing. Specifically, the radio communication terminal 10 determines the difference (estimated) 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). (Curve difference) is calculated. 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 determines that the transmission power difference tends to increase, and then performs the process of step 53. Move on. On the other hand, if the estimated curve difference does not exceed the estimated curve difference threshold over a predetermined period, the radio communication terminal 10 determines that the transmission power difference does not tend to increase, and then terminates the transmission power control sub-process. To do.
- radio communication terminal 10 determines whether or not the transmission power difference between carrier # 1 and carrier # 2 exceeds the maximum transmission power difference. When the transmission power difference exceeds the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 54. If the transmission power difference does not exceed the maximum transmission power difference, the radio communication terminal 10 ends the transmission power control sub-process.
- the radio communication terminal 10 changes the data rate of the uplink data transmitted via the carrier # 1 and the carrier # 2. Specifically, the radio communication terminal 10 increases the data rate of the uplink data transmitted through the carrier # 2 having a low transmission power among the adjacent carriers (for example, a table stored in the memory 19). 1st floor). Further, the radio communication terminal 10 may reduce the data rate of the uplink data transmitted via the carrier # 1 having the higher transmission power among the adjacent carriers (for example, in a table stored in the memory 19). , One stage).
- step 55 the radio communication terminal 10 determines the offset values of carrier # 1 and carrier # 2 according to the data rate determined in step 54.
- the communication control unit 23 does not simply transmit the difference between the transmission power between adjacent carriers, but transmits the transmission between adjacent carriers.
- the power difference is increasing and the transmission power difference between adjacent carriers is the largest.
- the offset value is changed as the data rate of each adjacent carrier is changed.
- the radio communication terminal 10 uses the data rate and offset value of the uplink data when the transmission power difference between adjacent carriers exceeds the maximum transmission power difference. Change the
- the radio communication terminal 10 considers not only the transmission power difference between adjacent carriers but also the data rate difference between adjacent carriers, and the data of the uplink data. Change rate and offset values.
- carrier control is not only control of the data rate of uplink data (that is, control of offset value) but also control including handoff processing.
- FIGS. 12 (a) to 15 (a) show the data rate and transmission power of adjacent carriers before carrier control.
- Figures 12 (b) to 15 (b) show the adjacent areas after carrier control. The data rate and transmission power of the carrier are shown.
- the first rate difference threshold is assumed to be larger than the second rate difference threshold.
- the data rate of carrier # 2 is higher than the data rate of carrier # 1, and the transmission power of carrier # 2 is also higher than the transmission power of carrier # 1 . Further, the value (data rate difference) obtained by subtracting the data rate of carrier # 1 having low transmission power from the data rate of carrier # 2 having high transmission power exceeds the first rate difference threshold.
- the difference between the transmission power of carrier # 1 and the transmission power of carrier # 2 exceeds the maximum transmission power difference, and carrier control is required. Accordingly, as shown in FIG. 12 (b), carrier control for increasing the data rate of carrier # 1 and reducing the data rate of carrier # 2 is performed.
- the transmission power of carrier # 2 is the transmission of carrier # 1 even though the data rate of carrier # 2 is lower than the data rate of carrier # 1. It is higher than electric power. Also, the data rate difference of carrier # 1 with low transmission power is subtracted from the data rate of carrier # 2 with high transmission power, and the value (data rate difference) is equal to the second rate difference threshold value (second rate difference threshold value 1 Smaller than (rate difference threshold). Note that the data rate difference is a value obtained by subtracting the data rate of the carrier with low transmission power from the data rate of the carrier with high transmission power. Therefore, in FIG. 13 (a), the data rate difference is a negative value. Please note that.
- the difference between the transmission power of carrier # 1 and the transmission power of carrier # 2 exceeds the maximum transmission power difference, and carrier control is required. Therefore, as shown in FIG. 13 (b), the transmission power is large and the handoff process of carrier # 2 is performed.
- the data rate of carrier # 2 is approximately equal to the data rate of carrier # 1, and the transmission power of carrier # 2 is higher than the transmission power of carrier # 1. high. Also, the value obtained by subtracting the data rate of carrier # 1 with low transmission power from the data rate of carrier # 2 with high transmission power (data rate difference) is greater than or equal to the second rate difference threshold, It is as follows. In addition, the data rate of carrier # 2, which has high transmission power, is lower than the predetermined data rate threshold.
- the difference between the transmission power of carrier # 1 and the transmission power of carrier # 2 exceeds the maximum transmission power difference, and carrier control is required. Therefore, as shown in FIG. 14B, handoff processing of carrier # 2 having a large transmission power is performed, and data rate control for increasing the data rate of carrier # 1 having a small transmission power is performed.
- the data rate of carrier # 2 is approximately equal to the data rate of carrier # 1, and the transmission power of carrier # 2 is higher than the transmission power of carrier # 1. high. Also, the value obtained by subtracting the data rate of carrier # 1 with low transmission power from the data rate of carrier # 2 with high transmission power (data rate difference) is equal to or greater than the second rate difference threshold, and the first rate difference threshold It is as follows. In addition, the data rate of carrier # 2 with high transmission power is equal to or higher than a predetermined data rate threshold.
- the difference between the transmission power of carrier # 1 and the transmission power of carrier # 2 exceeds the maximum transmission power difference, and carrier control is required. Therefore, as shown in Fig. 15 (b) In this way, carrier control is performed to reduce the data rate of carrier # 2, which has high transmission power.
- FIG. 16 is a flowchart showing the operation of the radio communication terminal 10 according to the third embodiment of the present invention.
- the transmission power control sub-process shown in FIG. 16 is executed in place of the transmission power control sub-process shown in FIGS.
- the radio communication terminal 10 determines the difference in transmission power of uplink data (transmission power difference) for adjacent carriers (for example, carrier # 1 and carrier # 2). Is calculated.
- radio communication terminal 10 determines whether or not the transmission power difference between adjacent carriers exceeds the maximum transmission power difference (MaxRLTxPwrDiff). When the transmission power difference between adjacent carriers exceeds the maximum transmission power difference, the radio communication terminal 10 proceeds to the process of step 62. Further, when the transmission power difference between adjacent carriers does not exceed the maximum transmission power difference, the radio communication terminal 10 ends the transmission power control sub-process.
- MaxRLTxPwrDiff maximum transmission power difference
- step 62 the radio communication terminal 10 calculates a value obtained by subtracting the data rate of the carrier with low transmission power from the data rate of the carrier with high transmission power as the data rate difference.
- step 63 the radio communication terminal 10 determines whether or not the data rate difference calculated in step 62 exceeds the first rate difference threshold value. If the data rate difference between adjacent carriers exceeds the first rate difference threshold, the radio communication terminal 10 proceeds to the process of step 64. On the other hand, when the data rate difference does not exceed the first rate difference threshold, the radio communication terminal 10 proceeds to the process of step 66.
- step 64 the radio communication terminal 10 reduces the data rate of the carrier having the higher transmission power among the adjacent carriers (for example, one stage in the table stored in the memory 19).
- step 65 the radio communication terminal 10 increases the data rate of the carrier having the lower transmission power among the adjacent carriers (for example, one stage in the table stored in the memory 19). Note that the processing of step 64 and step 65 is the same as the control shown in FIG.
- step 66 the radio communication terminal 10 determines whether or not the data rate difference calculated in step 62 is smaller than the second rate difference threshold (the second rate difference threshold minus the first rate difference threshold). To do. When the data rate difference between adjacent carriers is smaller than the second rate difference threshold value, the radio communication terminal 10 proceeds to the process of step 67. On the other hand, when the data rate difference is not smaller than the second rate difference threshold, the radio communication terminal 10 proceeds to the process of step 68.
- the second rate difference threshold the second rate difference threshold minus the first rate difference threshold
- step 67 the radio communication terminal 10 requests a handoff of a carrier having a large transmission power among adjacent carriers. Note that the processing of step 67 is the same as the control shown in FIG.
- step 68 the radio communication terminal 10 determines whether or not the data rate of the carrier having the large transmission power is smaller than the predetermined data rate threshold. When the data rate of the carrier with high transmission power is smaller than the predetermined data rate threshold, the radio communication terminal 10 proceeds to the process of step 70. On the other hand, when the data rate of the carrier having the large transmission power is not smaller than the predetermined data rate threshold, the radio communication terminal 10 proceeds to the process of step 69.
- step 69 the radio communication terminal 10 reduces the data rate of the carrier having the larger transmission power among the adjacent carriers (for example, one stage in the table stored in the memory 19). Note that the processing in step 69 is the same as the control shown in FIG.
- step 70 the radio communication terminal 10 requests a handoff of a carrier having a large transmission power among adjacent carriers.
- step 71 the radio communication terminal 10 increases the data rate of the carrier having the lower transmission power among the adjacent carriers. Note that the processing in step 70 and step 71 is the same as the control shown in FIG.
- step 72 the radio communication terminal 10 changes the offset value in accordance with the data rate change in each process (step 64, step 65, step 69 or step 71).
- the communication control unit 23 changes the data rate and the offset value of the uplink data in consideration of the data rate with respect to the transmission power of each adjacent carrier. To do.
- the data rate of the uplink data is controlled based on whether or not the transmission power difference between adjacent carriers exceeds the maximum transmission power difference.
- the present invention is not limited to this.
- the data rate of the uplink data is controlled based on whether or not the transmission power difference between two carriers that are not adjacent to each other exceeds a predetermined threshold! Moyo! ,.
- the predetermined threshold 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.
- the operation of the wireless communication terminal 10 according to the first to third embodiments described above can be provided as a program that can be executed by a computer.
- the wireless communication method and the wireless communication terminal according to the present invention can continue multi-carrier communication while suppressing interference between adjacent carriers having a predetermined frequency interval. It is useful for wireless communication such as mobile communication.
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Description
Claims
Priority Applications (2)
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US12/306,384 US8320495B2 (en) | 2006-06-29 | 2007-06-28 | Radio communication method and radio communication terminal |
CN2007800238357A CN101480091B (zh) | 2006-06-29 | 2007-06-28 | 无线通信方法和无线通信终端 |
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JP2006180355A JP4641513B2 (ja) | 2006-06-29 | 2006-06-29 | 無線通信方法及び無線通信端末 |
JP2006-180355 | 2006-06-29 |
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US (1) | US8320495B2 (ja) |
JP (1) | JP4641513B2 (ja) |
KR (1) | KR101031709B1 (ja) |
CN (1) | CN101480091B (ja) |
WO (1) | WO2008001858A1 (ja) |
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Also Published As
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US8320495B2 (en) | 2012-11-27 |
JP4641513B2 (ja) | 2011-03-02 |
KR20090030322A (ko) | 2009-03-24 |
JP2008011261A (ja) | 2008-01-17 |
CN101480091B (zh) | 2011-04-06 |
CN101480091A (zh) | 2009-07-08 |
KR101031709B1 (ko) | 2011-04-29 |
US20100061480A1 (en) | 2010-03-11 |
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