WO2007023515A1 - 通信端末装置、基地局装置及び受信品質報告方法 - Google Patents
通信端末装置、基地局装置及び受信品質報告方法 Download PDFInfo
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- WO2007023515A1 WO2007023515A1 PCT/JP2005/015198 JP2005015198W WO2007023515A1 WO 2007023515 A1 WO2007023515 A1 WO 2007023515A1 JP 2005015198 W JP2005015198 W JP 2005015198W WO 2007023515 A1 WO2007023515 A1 WO 2007023515A1
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- reception quality
- communication terminal
- subcarrier
- quality information
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
- H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
Definitions
- the present invention relates to a communication terminal apparatus, a base station apparatus, and a reception quality reporting method, and more particularly to a communication terminal apparatus, a base station apparatus, and a reception quality reporting method for reporting reception quality on the uplink in a multicarrier transmission scheme. .
- each subcarrier block (SCB1 to SCB8) differs due to the effect of frequency selective fading.
- the reception quality is reported from each communication terminal apparatus to the base station apparatus (Node B). It is possible to assign transmission data by selecting only subcarriers with good reception quality each time. This method is called frequency scheduling.
- each communication terminal device measures the reception quality for a known pilot signal transmitted from Node B, and receives the reception quality information (CQI) based on the measurement result to the base station device. It is necessary to report.
- CQI reception quality information
- Patent Document 1 JP 2001-351971 A
- each communication terminal apparatus since each communication terminal apparatus independently determines the subcarriers that report the reception quality, a plurality of communication terminal apparatus powers have the same subcarrier at the same time. Rear reception quality may be reported.
- the base station apparatus cannot allocate a plurality of communication terminal apparatuses to one subcarrier, there is a problem in that reception quality reporting is wasted and uplink interference is increased.
- reception quality is reported for all subcarriers, far from the base station device 1, and the communication terminal device
- reception quality deteriorates, there are cases in which no reception quality is reported. In this case, there is a problem that transmission allocation by scheduling cannot be performed fairly.
- the communication terminal apparatus includes reception quality measurement means for measuring reception quality for each subcarrier block, which is a bundle of a plurality of subcarriers, and reception quality information measured by the reception quality measurement means.
- Reception quality information generating means for generating certain reception quality information for each subcarrier block, transmission means for transmitting the reception quality information generated by the reception quality information generation means to a communication partner, and transmission means Control for controlling the number of subcarrier blocks for transmitting the reception quality information by the transmission means based on the reception quality information transmitted by the communication partner and a result scheduled by the communication partner using the reception quality information.
- the base station apparatus of the present invention includes a receiving unit that receives reception quality information that is reception quality information for each subcarrier block that is a bundle of a plurality of subcarriers, and the reception that is received by the receiving unit.
- the subkey for a communication terminal device whose quality information satisfies a predetermined quality.
- Scheduling means for performing scheduling which is a process for allocating resources for each carrier block, and the subcarrier block in which the communication terminal apparatus transmits the reception quality information based on the reception quality information and a result of scheduling in the scheduling means.
- the reception quality reporting method of the present invention includes a step of measuring reception quality for each subcarrier block, which is a bundle of a plurality of subcarriers, and receiving reception quality information, which is information of the measured reception quality, in the subcarriers.
- Generating for each carrier block transmitting the generated reception quality information from a communication terminal device to a base station device; receiving a reception quality information of a plurality of communication terminal devices by a base station device; A step of performing scheduling, which is a process of allocating resources for each subcarrier block within a predetermined resource to a communication terminal apparatus whose reception quality of the reception quality information satisfies a predetermined quality, and the result of the scheduling For the base station device to notify the communication terminal device, and the reception quality information transmitted from the communication terminal device to the base station device. A step in which the reception quality information communication terminal apparatus the number of subcarrier blocks to send to the control based on the result of the scheduling is notified from the base station apparatus, and the Ruyotsu be equipped with.
- FIG. 2 is a block diagram showing a configuration of a communication terminal apparatus according to Embodiment 1 of the present invention.
- FIG. 3 is a block diagram showing a configuration of a base station apparatus according to Embodiment 1 of the present invention.
- FIG. 4 is a diagram showing a format of a signaling signal according to Embodiment 1 of the present invention.
- FIG. 5 is a diagram showing a format of CQI report control information according to Embodiment 1 of the present invention.
- FIG. 6 is a diagram showing signal transmission / reception between the communication terminal apparatus and the base station apparatus according to Embodiment 1 of the present invention.
- FIG. 7 is a diagram illustrating operations of the communication terminal apparatus and the base station apparatus according to Embodiment 1 of the present invention.
- FIG. 8 is a diagram illustrating a CQI format according to Embodiment 1 of the present invention.
- FIG. 9 is a diagram showing a comparison circuit according to the first embodiment of the present invention.
- FIG. 10 is a diagram illustrating a method of configuring a subcarrier block according to Embodiment 1 of the present invention.
- FIG. 11 is a diagram illustrating a method of configuring a subcarrier block according to Embodiment 1 of the present invention. The figure which shows the format of CQI which concerns on Embodiment 1 of this invention
- FIG. 13 is a diagram showing a comparison circuit according to the second embodiment of the present invention.
- FIG. 14 is a diagram showing an instantaneous allocation rate and a cumulative allocation rate according to Embodiment 3 of the present invention.
- FIG. 15 shows a subcarrier block in which each communication terminal apparatus according to Embodiment 4 of the present invention reports CQI.
- FIG. 16 shows a CQI format according to the fourth embodiment of the present invention.
- FIG. 17 is a block diagram showing a configuration of a communication terminal apparatus according to Embodiment 5 of the present invention.
- FIG. 18 is a block diagram showing a configuration of a base station apparatus according to Embodiment 5 of the present invention.
- FIG. 19 is a diagram illustrating operations of the communication terminal apparatus and the base station apparatus according to Embodiment 5 of the present invention.
- FIG. 20 is a diagram showing a comparison circuit according to the sixth embodiment of the present invention.
- FIG. 21 shows a collision in a subcarrier block according to Embodiment 6 of the present invention.
- FIG. 22 is a block diagram showing a configuration of a communication terminal apparatus according to Embodiment 7 of the present invention.
- FIG. 23 is a block diagram showing a configuration of a base station apparatus according to Embodiment 7 of the present invention.
- FIG. 24 is a diagram showing CQI transmission timing of each communication terminal apparatus according to Embodiment 7 of the present invention.
- FIG. 2 is a block diagram showing a configuration of communication terminal apparatus 100 according to Embodiment 1 of the present invention.
- the antenna 101 receives the OFDM signal and outputs it to the RF receiver 102, and also transmits the RF signal. Transmits the transmission signal input from the receiver 119.
- RF receiving section 102 down-converts the received signal input from antenna 101 to the baseband frequency and outputs it to guard interval (hereinafter referred to as "GI") removing section 103.
- GI guard interval
- the GI removal unit 103 removes the GI from the received signal power input from the RF reception unit 102 and outputs it to the high-speed Fourier transform (hereinafter referred to as “FFT”) unit 104.
- FFT high-speed Fourier transform
- FFT section 104 performs FFT on the received signal input from GI removal section 103 and outputs the result to demodulation section 105, scheduling information extraction section 107, collision information extraction section 109, and reception quality measurement section 110.
- Demodulation section 105 demodulates the received signal input from FFT section 104 and outputs it to error correction decoding section 106.
- Error correction decoding section 106 performs error correction decoding on the received signal input from demodulation section 105, and outputs it as a received signal.
- Scheduling information extraction section 107 extracts scheduling information included in the received signal input from FFT section 104 and outputs the extracted scheduling information to selection section 108 and control section 113.
- the subcarrier block is a bundle of a plurality of subcarriers that are continuous or discontinuous on the frequency axis, or a plurality of subcarriers of a predetermined size and a plurality of transmissions in two dimensions of the time axis and the frequency axis. It is a bundle of time intervals (hereinafter referred to as “TTI”).
- Scheduling information is information on the result of scheduling, which is a process for allocating resources for each subcarrier block to each communication terminal apparatus based on reception quality information performed by the base station apparatus. Resources to be allocated are, for example, the number of subcarrier blocks, modulation scheme, coding rate, transmission rate, and transmission power.
- Selection section 108 extracts the MCS included in the scheduling information input from scheduling information extraction section 107, and based on the extracted MCS, error correction code section 115, modulation section 116, and IFFT section 117 Control signal processing. Specifically, the selection unit 108 stores resource allocation information that associates the MCS with the coding rate and the modulation scheme, and refers to the resource allocation information using the MCS included in the scheduling information. The coding rate and the modulation method are selected by the above. Then, the selection unit 108 is instructed by the MCS The error correction encoding unit 115 is controlled so that the transmission signal is encoded at the encoded rate.
- the selection unit 108 controls the modulation unit 116 so as to modulate the transmission signal by the modulation scheme instructed by the MCS.
- the selection unit 108 also controls an inverse fast Fourier transform (hereinafter referred to as “IFF Tj”) unit 117 so as to assign a transmission signal to the subcarrier block indicated by the scheduling information.
- IFF Tj inverse fast Fourier transform
- the collision information extraction unit 109 extracts the collision information included in the received signal input from the FFT unit 104 and outputs it to the control unit 113.
- the collision information is information on the number of communication terminal apparatuses that have reported CQI for the same subcarrier block at the same time.
- Reception quality measuring section 110 measures reception quality using a pipeline signal included in the reception signal input from FFT section 104. At this time, reception quality measurement section 110 measures the reception quality for each subcarrier block. Reception quality measuring section 110 then outputs the measured reception quality measurement result to CQI generating section 111.
- CQI generation unit 111 which is a reception quality information generation unit, generates and sorts CQI (reception quality information) that is information indicating the measurement result. Output to the unit 112 and the control unit 113. At this time, the CQI generator 111 generates a CQI for each subcarrier block.
- Sorting section 112 also arranges in order the power of arranging CQIs input from CQI generating section 111 in order from the one having the best reception quality or the power of the reception quality being deteriorated. Then, the sorting unit 112 outputs the arranged CQIs to the multiplexing unit 114 in the number instructed by the control unit 113 in order of the direction with good reception quality.
- Control unit 113 includes information on the number of subcarrier blocks that transmitted CQI input from CQI generation unit 111, collision information input from collision information extraction unit 109, and scheduling information input from scheduling information extraction unit 107. Based on the above, the number of subcarrier blocks for outputting C QI is instructed to sorting section 112. Details of the operation of the control unit 113 will be described later.
- Multiplexer 114 generates a multiplexed signal by multiplexing the transmission signal and CQI input from sorting unit 112, and outputs the generated multiplexed signal to error correction encoding unit 115.
- the error correction code key unit 115 performs the selection unit 10 on the multiplexed signal input from the multiplexing unit 114. Error correction coding is performed at the coding rate controlled in 8. Then, the error correction code unit 115 outputs the multiplexed signal subjected to the error correction code to the modulation unit 116.
- Modulation section 116 modulates the multiplexed signal input from error correction code section 115 with the modulation scheme controlled by selection section 108 and performs inverse fast Fourier transform (hereinafter referred to as "IFFT"). Output to part 117.
- IFFT inverse fast Fourier transform
- IFFT section 117 performs an IFFT on the multiplexed signal input from modulation section 116, and generates an OFDM signal by placing the transmission signal in each subcarrier block. At this time, IFFT section 117 arranges the transmission signal in the subcarrier block controlled by selection section 108, that is, the subcarrier block assigned by the base station apparatus through scheduling. Then, IF FT section 117 outputs the generated OFDM signal to GI insertion section 118.
- GI insertion unit 118 inserts GI into the OFDM signal input from IFFT unit 117 and outputs the result to RF transmission unit 119.
- RF transmission section 119 up-converts the OFDM signal input from GI insertion section 118 to the baseband frequency power to a radio frequency and outputs the result to antenna 101.
- FIG. Figure 3 shows the base station equipment
- FIG. 2 is a block diagram showing a configuration of 200.
- Antenna 201 receives the OFDM signal and outputs it to RF receiving section 202, and transmits the OFDM signal input from RF transmitting section 217.
- RF receiving section 202 down-converts the received signal input from antenna 201 to the baseband frequency and outputs it to GI removing section 203.
- the GI removal unit 203 removes the GI from the received signal power input from the RF reception unit 202, and the FFT unit
- FFT section 204 performs FFT on the received signal input from GI removal section 203 and outputs the result to demodulation section 205.
- Demodulation section 205 demodulates the received signal input from FFT section 204 and outputs the demodulated signal to error correction decoding section 206.
- Error correction decoding section 206 performs error correction decoding on the received signal input from demodulation section 205, outputs it to CQI extraction section 207, and outputs it as a received signal.
- CQI extraction section 207 also extracts the CQI from the received signal power input from error correction decoding section 206, and outputs the extracted CQI to collision measurement section 208 and scheduling section 210.
- the collision measurement unit 208 measures a collision based on the CQI input from the CQI extraction unit 207. Specifically, collision measurement section 208 measures the number of collisions for each subcarrier block. Then, the collision measurement unit 208 outputs the measurement result of the number of collisions to the collision information generation unit 209.
- collision means that a plurality of communication terminal apparatus powers are transmitted for the same subcarrier block at the same time.
- the collision information generation unit 209 Based on the measurement result input from the collision measurement unit 208, the collision information generation unit 209 generates collision information that is information indicating the measurement result and outputs the collision information to the multiplexing unit 212.
- the scheduling unit 210 performs scheduling based on the CQI input from the CQI extraction unit 207. For example, scheduling section 210 allocates a communication terminal apparatus that has transmitted CQI with the best reception quality for each subcarrier block, and selects an MCS with a combination of coding rate and modulation scheme according to the transmitted CQI. . Then, scheduling section 210 outputs the subcarrier block information and MCS assigned to each communication terminal apparatus to scheduling information generation section 211.
- Scheduling information generation section 211 generates scheduling information including subcarrier block information and MCS assigned to each communication terminal apparatus input from scheduling section 210, and outputs the scheduling information to multiplexing section 212.
- Multiplexer 212 multiplexes the transmission signal, pilot signal, collision information input from collision information generator 209, and scheduling information input from scheduling information generator 211 to generate a multiplexed signal, and generates the generated multiplexed signal Is output to the error correction coding unit 213.
- the error correction code unit 213 performs error correction code input on the multiplexed signal input from the multiplexing unit 212 and outputs it to the modulation unit 214.
- Modulating section 214 modulates the multiplexed signal input from error correcting code key section 213 and outputs the modulated signal to IFFT section 215.
- IFFT section 215 performs an IFFT on the multiplexed signal input from modulation section 214 to generate an OFDM signal, and outputs the generated OFDM signal to GI insertion section 216.
- GI insertion unit 216 inserts a GI into the OFDM signal input from IFFT unit 215 and transmits the RF signal. Output to part 217.
- RF transmitting section 217 upconverts the OFDM signal input from GI insertion section 216 to a baseband frequency power to a radio frequency and outputs the result to antenna 201.
- the base station apparatus 200 requests the number of communication terminal apparatuses 100 communicating in its own cell, the QoS requested by each communication terminal apparatus 100, the QoS requested by each communication terminal apparatus 100, and so on.
- Communication terminal apparatus 100 transmits a signaling signal to base station apparatus 200, thereby requesting QoS, transmission rate, and data size and transmitting CQI.
- FIG. 4 is a diagram showing a format of a signaling signal 300 transmitted from the communication terminal apparatus 100 to the base station apparatus 200.
- Signaling signal 300 is requested QoS # 301, which is QoS information required by communication terminal apparatus 100, requested transmission rate # 302, which is information of a transmission rate requested by communication terminal apparatus 100, and requested by communication terminal apparatus 100. It consists of requested data size # 303 and CQI # 304, which are data size information.
- the base station apparatus 200 that has received the signaling signal 300 determines the transmission rate of the communication terminal apparatus 100 based on the request of the communication terminal apparatus 100, and further increases the determined transmission rate to the communication terminal apparatus 100 that can achieve the determined transmission rate.
- the number of subcarrier blocks to be allocated is determined.
- FIG. 5 is a diagram showing a format of CQI report control information 400 transmitted from base station apparatus 200 to communication terminal apparatus 100.
- the number of subcarrier blocks # 401 defines the number of subcarrier blocks to be reported
- reporting period # 402 defines the period for transmitting CQI.
- Report timing offset # 403 defines the report timing offset in the report cycle.
- Frequency range # 404 defines the frequency range of the subcarrier block to be reported by communication terminal device 100. By varying the frequency range of the subcarrier block to be reported between communication terminal devices 100, Report collisions between communication terminal devices 100 can be reduced. In addition, reporting sub-carry
- the instruction # 405 for changing the block is an instruction to change the number of the subcarrier block to be reported to the communication terminal device 100. The collision at a specific subcarrier block number is high! There is an effect of dispersing carrier blocks.
- FIG. 6 is a diagram showing signal transmission / reception between base station apparatus 200 and communication terminal apparatus 100
- FIG. 7 is a diagram showing operations of communication terminal apparatus 100 and base station apparatus 200.
- the horizontal axis indicates time
- communication terminal apparatus 100-1 and communication terminal apparatus 100-2 have the same configuration as communication terminal apparatus 100 of FIG.
- the two communication terminal devices 100 are described as communicating with the base station device 200.
- the number of communication terminal devices 100 can be set to an arbitrary number.
- Communication terminal apparatus 100 transmits signaling signal 300 in Fig. 4 on the uplink (step ST501), and base station apparatus 200 transmits CQI report control information 400 in Fig. 5 on the downlink (Ste ST502). This is the process of the initial report before controlling the number of subcarrier blocks.
- base station apparatus 200 instructs communication terminal apparatus 100 to transmit CQI of at least one subcarrier block with subcarrier block number # 401.
- Base station apparatus 200 does not have to limit the number of CQIs indicated by subcarrier block number # 401 to any number.
- Each communication terminal apparatus 100-1, 100-2 measures reception quality of each subcarrier block at reception quality measurement section 110, and generates CQI at CQI generation section 111. Then, communication terminal apparatus 100 transmits, for example, one CQI of a subcarrier block having the best reception quality among the generated CQIs to base station apparatus 200 (steps ST601 and ST602).
- FIG. 8 is a diagram showing a format of CQI 700 transmitted from communication terminal apparatuses 100-1 and 100-2.
- the CQI 700 includes a reporting subcarrier block number # 701 and an MCS # 702 indicating reception quality of the reporting subcarrier block.
- base station apparatus 200 that has received CQI performs scheduling based on CQI at scheduling section 210.
- scheduling communication terminal devices 100-1 and 10 No subcarrier block is assigned to 0—2, and base station apparatus 200 transmits scheduling information indicating that no subcarrier block is assigned to each communication terminal apparatus 100-1, 100-2. (Step ST603, Step ST604).
- base station apparatus 200 that has received CQI performs scheduling based on CQI at scheduling section 210.
- scheduling subcarrier blocks are not allocated to communication terminal apparatuses 100-1 and 100-2, and base station apparatus 200 has subcarrier blocks assigned to communication terminal apparatuses 100-1 and 100-2.
- Scheduling information indicating that it is not assigned is transmitted (step ST607, step ST608).
- the communication terminal apparatuses 100-1 and 100-2 that have received the scheduling information extract the scheduling information by the scheduling information extraction unit 107.
- Communication terminal apparatuses 100-1 and 100-2 use control circuit 113 to compare the reported number of subcarrier blocks with the number of assigned subcarrier blocks using comparison circuit 800. As a result of comparison, the number of subcarrier blocks for which communication terminal apparatuses 100-1 and 100-2 have reported CQI is “2”, and the number of subcarrier blocks allocated in base station apparatus 200 is “0”. Based on the comparison result output from comparison circuit 800, control unit 113 further increases the number of CQI subcarrier blocks to be reported by one.
- the communication terminal devices 100-1 and 100-2 output three CQIs from the sorting unit 112. As a result, each communication terminal device 100-1, 100-2 is Three QIs are transmitted to base station apparatus 200 (step ST609, step ST610).
- base station apparatus 200 that has received CQI performs scheduling based on CQI at scheduling section 210.
- scheduling one subcarrier block is allocated to each of the communication terminal apparatuses 100-1 and 100-2, and the base station apparatus 200 assigns a subcarrier to each of the communication terminal apparatuses 100-1 and 100-2.
- Scheduling information indicating that one block has been allocated is transmitted (step ST611, step ST612).
- base station apparatus 200 selects MCS based on CQI at scheduling section 210 and transmits the selected MCS including the selected MCS.
- Communication terminal devices 100-1 and 100-2 that have received the scheduling information extract scheduling information by scheduling information extraction section 107.
- Communication terminal apparatuses 100-1 and 100-2 use control circuit 113 to compare the reported number of subcarrier blocks with the number of assigned subcarrier blocks using comparison circuit 800. As a result of comparison, the number of subcarrier blocks for which communication terminal apparatuses 100-1 and 100-2 have reported CQI is “3”, and the number of subcarrier blocks allocated in base station apparatus 200 is “1”. Based on the comparison result output from comparison circuit 800, control unit 113 reduces the number of CQI subcarrier blocks to be reported by one.
- the communication terminal apparatuses 100-1 and 100-2 output two CQIs from the sorting unit 112.
- each communication terminal apparatus 100-1, 100-2 transmits two CQIs to base station apparatus 200 (step ST613, step ST614). Thereafter, communication terminal apparatuses 100-1 and 100-2 and base station apparatus 200 can adaptively control the number of subcarrier blocks for transmitting CQI by repeating similar processing.
- the comparison in comparison circuit 800 is not limited to the comparison between the number of subcarrier blocks reported by communication terminal apparatuses 100-1 and 100-2 and the number of subcarrier blocks assigned by base station apparatus 200, Comparison of the allocation rate, which is the ratio of the number of subcarrier blocks actually allocated by base station apparatus 200, to the number of subcarrier blocks for which communication terminal apparatuses 100-1 and 100-2 reported CQI, and the threshold good.
- communication terminal devices 100-1 and 100-2 increase the number of subcarrier blocks that report CQI if the allocation rate is less than the threshold, and report CQI if the allocation rate is the threshold or greater than the value. Reduce the number of subcarrier blocks to be used.
- the number of subcarrier blocks to be increased and subcarriers to be reduced The number of blocks is not limited to one, and an arbitrary number of subcarrier blocks can be increased or decreased. Further, the number of subcarrier blocks to be increased or decreased may be changed.
- step ST609 and step ST610 overlaps for one subcarrier block
- the base station apparatus 200 detects that a collision has occurred in the collision measurement unit 208, and detects collision information.
- the generation unit 209 generates collision information for the number of collisions “1”.
- Base station apparatus 200 then transmits collision information to communication terminal apparatuses 100-1 and 100-2 (step ST611 and step ST612).
- the communication terminal devices 100-1 and 100-2 that have received the collision information extract the collision information by the collision information extraction unit 109. Then, communication terminal apparatuses 100-1 and 100-2 increase the number of CQI subcarrier blocks to be reported by one in control section 113.
- the communication terminal apparatuses 100-1 and 100-2 output four CQIs from the sorting unit 112. Thereby, each communication terminal apparatus 100-1, 100-2 transmits four CQIs to base station apparatus 200 (step ST609, step ST610).
- communication terminal apparatuses 100-1 and 100-2 use control circuit 113 to compare the reported number of subcarrier blocks and the number of assigned subcarrier blocks in comparison circuit 800. Control the number of CQI subcarrier blocks to be reported in consideration of the comparison result.
- the communication terminal apparatuses 100-1 and 100-2 are not limited to considering both the collision information and the comparison result in the comparison circuit 800, but either one of the collision information and the comparison result in the comparison circuit 800. You may make it consider only. For example, when only the comparison result in the comparison circuit 800 is considered, the communication terminal apparatuses 100-1 and 100-2 have the number of subcarrier blocks actually allocated to the number of reports in the past predetermined time. Compare the cumulative allocation rate or average, which is a percentage, with the threshold.
- the cumulative allocation rate or average value is smaller than the threshold value, the number of subcarrier blocks that report CQI is increased, and if the cumulative allocation rate or average value is equal to or greater than the threshold value, subcarriers that report CQI Reduce the number of blocks.
- the overhead due to downlink signaling can be reduced compared with the case where the base station apparatus transmits collision information.
- the number of subcarrier blocks to be increased and the number of subcarrier blocks to be reduced are limited to one. Instead, an arbitrary number of subcarrier blocks can be increased or decreased. Further, the number of subcarrier blocks to be increased or decreased may be changed.
- FIG. 10 and FIG. 11 are diagrams showing a method of forming a subcarrier block by bundling a plurality of subcarriers within a predetermined communication band.
- N subcarriers within a predetermined communication band for example, 20 MHz
- # 901 are selected and bundled in a predetermined number of consecutive end powers in order (N is a natural number of 2 or more).
- Sub-carrier blocks G1 to GN are configured.
- N subcarrier blocks G1 to GN are formed by selecting and bundling a predetermined number of subcarriers within a predetermined communication band (for example, 20 MHz) # 1001 discontinuously at regular intervals. Constitute.
- the first embodiment based on the comparison result between the number of subcarrier blocks of CQI reported by the communication terminal apparatus and the number of subcarrier blocks actually allocated, or collision information, By controlling the number of CQI subcarrier blocks reported by the communication terminal device, it is possible to suppress uplink interference that does not waste reception quality reporting, and optimal allocation by scheduling is possible. Resource loss can be prevented, and the fairness of scheduling transmission assignments can be maintained.
- communication terminal apparatus 100 reports reception quality including MCS in CQI, but is not limited to this, and reports reception quality including SINR in CQI. You may do it.
- FIG. 12 shows the format of CQI 1100 when reporting reception quality including SINR in CQI.
- CQI 1100 includes subcarrier block number # 1101 to be reported and SINR # 1102 measured by reception quality measurement section 110.
- FIG. 13 is a block diagram showing a configuration of comparison circuit 1200 according to Embodiment 2 of the present invention.
- the configuration of the communication terminal apparatus is the same as that in FIG. 2, and the configuration of the base station apparatus is the same as that in FIG.
- Communication terminal apparatuses 100-1 and 100-2 were assigned by controller 113 using base station apparatus 200 and the reported desired transmission rate by CQI using comparison circuit 1200 in FIG. Compare the transmission rate.
- Communication terminal devices 100-1 and 100-2 are By receiving the transmission information, the assigned transmission rate can be known. For example, a bit rate is used as the transmission rate.
- control unit 113 reports that the transmission rate assigned by base station apparatus 200 is lower than the desired transmission rate desired by communication terminal apparatuses 100-1 and 100-2. If the transmission rate assigned by base station apparatus 200 is the same as the desired transmission rate desired by communication terminal apparatuses 100-1 and 100-2, the number of CQI subcarrier blocks to be used is increased. Reduce the number of CQI subcarrier blocks.
- the operation of the communication terminal device and base station device was assigned to the desired transmission rate based on the reported CQI in the configuration that compares the number of reported subcarrier blocks of CQI with the number of actually assigned subcarrier blocks. The description is omitted because it is the same as that of the first embodiment except for the configuration for comparing the transmission rate.
- the communication terminal is based on the comparison result between the desired transmission rate by CQI reported by the communication terminal apparatus and the actually assigned transmission rate, or the collision information.
- the power to control the number of subcarrier blocks based on the comparison result between the desired transmission rate and the actually assigned transmission rate is not limited to this.
- the number of subcarrier blocks may be controlled based on a comparison result between the ratio of transmission rates actually allocated and a threshold value. In this case, if the ratio of the actually assigned transmission rate to the desired transmission rate is less than the threshold, the number of subcarrier blocks that transmit CQI is increased, and the ratio of the actually assigned transmission rate to the desired transmission rate is increased. If is greater than or equal to the threshold, the number of subcarrier blocks that transmit CQI is reduced.
- FIG. 14 is a diagram showing the instantaneous allocation rate and the cumulative allocation rate measured by the communication terminal apparatus according to Embodiment 3 of the present invention.
- the communication terminal Since the configuration of the apparatus is the same as in FIG. 2 and the configuration of the base station apparatus is the same as in FIG. 3, the description thereof is omitted.
- SCB is a subcarrier block.
- the number of reports or the report time number (A) is the number of times or the time when the communication terminal apparatus reports CQI to the base station apparatus, and is reported in, for example, a 1TTI cycle.
- the number of reporting subcarrier blocks (B) instructed from the base station apparatus (Node B) is the number of subcarrier blocks reporting CQI instructed to the communication terminal apparatus by the base station apparatus. In the case of, all are "1".
- (B) is indicated by the number of subcarrier blocks # 401 of CQI report control information 400 in FIG.
- the reported number of subcarrier blocks (SCB) (C) is the number of subcarrier blocks that the communication terminal device has transmitted CQI to the base station device.
- the number of subcarrier blocks (SCB) actually allocated (D) is the number of subcarrier blocks actually allocated by scheduling in the base station apparatus.
- the instantaneous allocation rate (E) is obtained by (D) Z (B).
- the cumulative allocation rate (F) is calculated by ((D) total) / (A).
- the control unit 113 of the communication terminal apparatus 100 compares (E) or (F) with a threshold value and reports (C) the CQI that reports (E) or (F) if it is less than the value. Instruct to increase the number of subcarrier blocks. (E) or (F) If it is greater than or equal to the value, instruct to reduce the number of CQI subcarrier blocks to be reported.
- Embodiment 3 by controlling the number of subcarrier blocks of CQI reported by the communication terminal apparatus based on the instantaneous allocation rate or cumulative allocation rate, or collision information, It is possible to suppress uplink interference that does not cause unnecessary reception quality reporting, enabling optimal allocation through scheduling, preventing resource loss, and ensuring fairness in transmission allocation through scheduling. Can be kept.
- FIG. 15 is a diagram showing a subcarrier block in which each communication terminal apparatus according to Embodiment 4 of the present invention reports CQI.
- the configuration of the communication terminal apparatus is the same as in FIG. 2, and the configuration of the base station apparatus is the same as in FIG.
- FIG. 15 shows a case where communication is performed with, for example, eight communication terminal apparatus power Si base station apparatuses, and the total number of subcarrier blocks is eight, for example.
- SCB is a subcarrier block
- UE1 to UE8 are communication terminal apparatuses.
- each communication terminal apparatus shows a case where CQI is reported for two subcarrier blocks.
- each communication terminal apparatus individually has an arbitrary number of three or more subcarrier blocks. It can also be applied when reporting CQI.
- each communication terminal apparatus 100 determines to output CQI of one subcarrier block based on the number of subcarrier blocks that have transmitted CQI and the number of actually allocated subcarrier blocks, The sorting unit 112 is actually instructed to increase the number of subcarrier blocks to which CQI is transmitted by one and output CQI for two subcarrier blocks (NO. 1 and NO. 2). As a result, each communication terminal apparatus 100 transmits CQI of two subcarrier blocks. For example, when UE1 transmits one CQI, since it collides with UE6 in subcarrier block 1, if base station apparatus assigns subcarrier block 1 to UE6, UE1 is completely sub The carrier block cannot be assigned. However, in Embodiment 4, UE1 reports CQI even for subcarrier block 2! /, So there is a possibility that subcarrier block 2 will be assigned to UE1! There is.
- FIG. 16 is a diagram showing a format of CQI 1500 transmitted from each communication terminal apparatus UE1 to UE8.
- CQI 1500 includes subcarrier block number # 1501 to be reported and MCS # 1502 indicating the reception quality of the subcarrier block to be reported.
- the number of subcarrier blocks reporting CQI is made redundant, thereby increasing the probability of allocation. be able to.
- FIG. 17 is a block diagram showing a configuration of communication terminal apparatus 1600 according to Embodiment 5 of the present invention.
- Communication terminal device 1600 according to Embodiment 5 is the same as communication terminal device 100 according to Embodiment 1 shown in FIG. 2, except for collision information extraction section 109 and control section 11 as shown in FIG.
- FFT section 104 performs FFT on the received signal input from GI removal section 103 and outputs the result to demodulation section 105, scheduling information extraction section 107, and reception quality measurement section 110.
- Scheduling information extraction section 107 extracts scheduling information that is included in the received signal input from FFT section 104 and is information on the result of processing for allocating resources for each subcarrier block in the base station apparatus. To the selection unit 108 and the sorting unit 112.
- CQI generation section 111 Based on the measurement result input from reception quality measurement section 110, CQI generation section 111 generates CQI that is information indicating the measurement result and outputs the generated CQI to sorting section 112. At this time, CQI generator
- Sorting section 112 also arranges the order of the CQI input from CQI generating section 111 in order from the one with the best reception quality, or the order of the ability for the reception quality to deteriorate. Then, the sorting unit 112 outputs the arranged CQIs to the multiplexing unit 114 in the number instructed by the control unit 113 in order of the direction with good reception quality.
- FIG. 18 is a block diagram showing a configuration of base station apparatus 1700.
- Base station apparatus 1700 according to Embodiment 5 includes calculation section 170 in base station apparatus 200 according to Embodiment 1 shown in FIG. 3, except for collision information generation section 209, as shown in FIG.
- control part 1702 are added.
- FIG. 18 the same components as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.
- CQI extraction section 207 also extracts the CQI from the received signal power input from error correction decoding section 206, and outputs the extracted CQI to collision measurement section 208, scheduling section 210, and calculation section 1701.
- the collision measurement unit 208 measures a collision based on the CQI input from the CQI extraction unit 207. Specifically, collision measurement section 208 measures the number of collisions for each subcarrier block. The collision measurement unit 208 outputs the measurement result of the number of collisions to the control unit 1702. To help.
- Scheduling section 210 performs scheduling based on the CQI input from CQI extraction section 207. For example, scheduling section 210 assigns to each communication terminal apparatus that has transmitted the CQI having the best reception quality for each subcarrier block, and selects an MCS having a combination of a coding rate and a modulation scheme according to the transmitted CQI. . Then, scheduling section 210 outputs subcarrier block information and MCS allocated to each communication terminal apparatus to scheduling information generation section 211 and calculation section 1701.
- Calculation section 1701 compares CQI input from CQI extraction section 207 and scheduling information input from scheduling section 210, and outputs the comparison result to control section 1702.
- control unit 1702 determines whether the communication terminal apparatus 1600 reports CQI at the next TTI. Control the number of subcarrier blocks. Control section 1702 then outputs information on the controlled number of subcarrier blocks to scheduling information generation section 211.
- Scheduling information generating section 211 includes scheduling information including subcarrier block information and MCS assigned to each communication terminal device input from scheduling section 210, and information on the number of subcarrier blocks input from control section 1702 Is output to the multiplexing unit 2 12.
- FIG. 19 shows operations of base station apparatus 1700 and communication terminal apparatus 1600.
- the horizontal axis indicates time
- communication terminal apparatus 1600-1 and communication terminal apparatus 1600-2 have the same configuration as communication terminal apparatus 1600 in FIG.
- FIG. 19 shows a case where two communication terminal apparatuses 1600 communicate with base station apparatus 1700.
- the number of communication terminal apparatuses 1600 can be set to an arbitrary number.
- Communication terminal apparatus 1600 transmits signaling signal 300 in FIG. 4 on the uplink, and base station apparatus 200 transmits CQI report control information 400 in FIG. 5 on the downlink. This completes the initial report process before controlling the number of subcarrier blocks. Other initial reports Since this process is the same as that in the first embodiment, description thereof is omitted.
- base station apparatus 1700 transmits CQI of at least one subcarrier block to communication terminal apparatuses 1600-1 and 1600-2 with subcarrier block number # 401. Instruct. Base station apparatus 1700 does not limit the number of CQIs indicated by subcarrier block number # 401 to any number, not limited to one.
- Each communication terminal apparatus 1600-1, 1600-2 measures the reception quality of each subcarrier block at reception quality measurement section 110, and generates CQI at CQI generation section 111. Then, communication terminal apparatuses 1600-1 and 1600-2 transmit, for example, one CQI of the subcarrier block with the best reception quality among the generated CQIs to base station apparatus 1700 (step ST1801, step 1). ST1802).
- the CQI format is the same as in Fig. 8, and its explanation is omitted.
- base station apparatus 1700 that has received CQI does not assign subcarrier blocks to communication terminal apparatuses 1600-1 and 1600-2. Therefore, the base station apparatus 1700 outputs a comparison result in which the number of subcarrier blocks of the received CQI is “1” and the number of actually assigned subcarrier blocks is “0” in the calculation unit 1701.
- Control unit 1702 decides to increase the number of subcarrier blocks reporting CQI by one and transmit CQIs of two subcarrier blocks, and scheduling information generation unit 211 transmits CQI.
- Information on the number of subcarrier blocks indicating that the number of subcarrier blocks is “2” is used as scheduling information. Therefore, base station apparatus 1700 transmits scheduling information including information indicating that subcarrier blocks are not allocated and information on the number of subcarrier blocks for which the number of subcarrier blocks reporting CQI is “2” (step ST1803, Step ST1804).
- each communication terminal apparatus 1600-1, 1600-2 measures reception quality of each subcarrier block at reception quality measurement section 110, and generates CQI at CQI generation section 111. . Then, communication terminal apparatuses 1600-1 and 1600-2 have the same number of upper C sub-blocks with good reception quality as indicated in the scheduling information among the generated CQIs. Two CQIs are transmitted to base station apparatus 1700 (step ST1805, step ST1806). Note that the CQI format is the same as that shown in FIG.
- base station apparatus 1700 that has received CQI does not assign subcarrier blocks to communication terminal apparatuses 1600-1 and 1600-2 as a result of scheduling in scheduling section 210. Therefore, the base station apparatus 1700 outputs the comparison result in which the number of subcarrier blocks of the received CQI is “2” and the number of actually assigned subcarrier blocks is “0” in the calculation unit 1701 for control. In part 1702, it is decided to further increase the number of subcarrier blocks reporting CQI by one and to transmit CQIs of three subcarrier blocks, and in scheduling information generation part 211, subcarriers to transmit CQI Information on the number of subcarrier blocks whose number of blocks is “3” is included in the scheduling information. Therefore, the base station apparatus 1700 transmits scheduling information including information that the subcarrier blocks are not allocated and information on the number of subcarrier blocks that sets the number of subcarrier blocks that report CQI to “3” (step ST1807, step ST1808).
- each communication terminal apparatus 1600-1, 1600-2 measures the reception quality of each subcarrier block at reception quality measurement section 110, and generates CQI at CQI generation section 111.
- Communication terminal apparatuses 1600-1 and 1600-2 base three CQIs of the top three subcarrier blocks with good reception quality, for example, the number indicated in the scheduling information among the generated CQIs. Transmit to station apparatus 1700 (step ST1809, step ST1810).
- base station apparatus 1700 that has received CQI assigns one subcarrier block to communication terminal apparatuses 1600-1 and 1600-2. Therefore, the base station apparatus 1700 outputs a comparison result in which the number of subcarrier blocks of the received CQI is “3” and the number of actually assigned subcarrier blocks is “1” in the calculation unit 1701.
- Control section 1702 decides to reduce the number of subcarrier blocks reporting CQI by one and transmit CQIs of two subcarrier blocks.
- Scheduling information generation section 211 receives CQI transmission sub-blocks. Information on the number of subcarrier blocks whose number of carrier blocks is “2” is included in the scheduling information.
- the base station apparatus 1700 has scheduling information including information to which one subcarrier block is allocated and information on the number of subcarrier blocks for setting the number of subcarrier blocks to report CQI to “2”. Information is transmitted (step ST1811, step ST1812).
- each communication terminal apparatus 1600-1, 1600-2 measures reception quality of each subcarrier block at reception quality measurement section 110, and generates CQI at CQI generation section 111. .
- Communication terminal apparatuses 1600-1 and 1600-2 base two CQIs of the top two subcarrier blocks with good reception quality, for example, the number indicated in the scheduling information among the generated CQIs. Transmit to station apparatus 1700 (step ST1813, step ST1814). Thereafter, communication terminal apparatuses 1600-1, 1600-2 and base station apparatus 1700 can adaptively control the number of subcarrier blocks transmitting CQI by repeating the same processing.
- the number of subcarrier blocks to be increased and the number of subcarrier blocks to be decreased are not limited to one, and an arbitrary number of subcarrier blocks can be increased or decreased. It is also possible to change the number of subcarrier blocks to be increased or decreased.
- the base station device 1700 causes the collision measurement unit 208 to generate a collision with the number of collisions “1”. Detect that. Then, base station apparatus 1700 determines that control section 1702 increases the number of subcarrier blocks reporting CQI by one. Next, base station apparatus 1700 increments the number of subcarrier blocks by one, and transmits information on the number of subcarrier blocks whose subcarrier block number is “4” included in the scheduling information.
- communication terminal apparatuses 1600-1 and 1600-2 extract scheduling information at scheduling information extraction section 107, and output four CQIs from sorting section 112. As a result, each communication terminal apparatus 1600-1 and 1600-2 transmits four CQIs to base station apparatus 1700 (step ST1809 and step ST1810).
- base station apparatus 1700 uses control section 1702 to count the number of collisions, and in comparison circuit 800, receives the number of subcarrier blocks of CQI received.
- the number of subcarrier blocks that report CQI is controlled by further considering the result of comparison between the number of subcarrier blocks and the number of allocated subcarrier blocks.
- the base station apparatus 1700 is not limited to considering both the number of collisions and the comparison result in the comparison circuit 800, but considers only one of the number of collisions and the comparison result in the comparison circuit 800. May be. Also increase sub-carry
- the number of blocks and the number of subcarrier blocks to be reduced are not limited to one, and an arbitrary number of subcarrier blocks can be increased or decreased. It is also possible to change the number of subcarrier blocks to be increased or decreased.
- Embodiment 5 based on the comparison result between the number of subcarrier blocks of CQI reported by the communication terminal apparatus and the number of subcarrier blocks actually allocated, or collision information, By controlling the number of CQI subcarrier blocks reported by the communication terminal device, it is possible to suppress uplink interference that does not waste reception quality reporting, and optimal allocation by scheduling is possible. Resource loss can be prevented, and the fairness of scheduling transmission assignments can be maintained.
- Embodiment 5 if the number of subcarrier blocks for transmitting CQI is controlled by control section 1702 of the base station apparatus, Embodiment 5 will be The present invention can be applied to Embodiments 2 to 4.
- FIG. 20 is a diagram showing a comparison circuit 1900 according to the sixth embodiment of the present invention.
- the configuration of the communication terminal apparatus is the same as that in FIG. 17, and the configuration of the base station apparatus is the same as that in FIG.
- Base station apparatus 1700 uses control section 113 to compare the number of subcarrier blocks actually allocated by scheduling to the number of subcarrier blocks of CQI that has been collided and received, using comparison circuit 1900 in FIG. The allocation rate is compared with the threshold value. If the collision or allocation rate is less than the threshold value as a result of the comparison, the control unit 113 increases the number of subcarrier blocks reporting CQI, and if the collision or allocation rate is greater than or equal to the value, Reduce the number of subcarrier blocks reporting CQI. Note that the operations of the communication terminal apparatus and the base station apparatus are the same as those in the fifth embodiment, and thus the description thereof is omitted.
- FIG. 21 is a diagram illustrating a collision state of subcarrier blocks that transmit CQI of each communication terminal device measured by the base station device. From Fig. 21, the reporting time (A) indicates that the same numerical value is the same time. Also, the report subcarrier block number (B) Is the subcarrier block number reported to the base station apparatus. In the case of FIG. 21, it indicates that there are a total of eight subcarrier blocks from number 1 to number 8. The number of CQI reports (C) for any subcarrier block is the number of CQI reports for one arbitrarily selected subcarrier block. The collision magnification (D) of an arbitrary subcarrier block is the same value as (C).
- UE report distribution shows the distribution situation in which multiple communication terminal devices report simultaneously for each subcarrier block.
- the number of all UEs indicates the number of communication terminal apparatuses existing in the cell. In the case of FIG. 21, the number of communication terminal apparatuses is 16.
- the cumulative Z instantaneous allocation rate (G) by UE indicates the cumulative allocation rate / instantaneous allocation rate of each communication terminal device.
- the desired Z actual bit rate (H) for each UE represents the desired bit rate Z actually allocated to each communication terminal apparatus.
- the UE-specific reporting frequency range (I) indicates the CQI reporting frequency range of each communication terminal.
- Control section 1702 of base station apparatus 1700 compares (D) with a threshold value in comparison circuit 1900, and if (D) is less than the threshold value, the number of subcarrier blocks reporting CQI (D) If it is greater than or equal to the value, control is performed so that the number of subcarrier blocks reporting CQI is reduced.
- the number of subcarrier blocks of CQI reported by the communication terminal apparatus is controlled based on the allocation rate or collision information, so that the reception quality report can be made. Uplink interference that does not cause waste can be suppressed, optimal allocation by scheduling is possible, resource loss can be prevented, and fairness of transmission allocation by scheduling can be maintained. .
- FIG. 22 is a block diagram showing a configuration of communication terminal apparatus 2100 according to Embodiment 7 of the present invention.
- Communication terminal apparatus 2100 according to Embodiment 7 adds ONZOFF control information extraction section 2101 as shown in FIG. 22 to communication terminal apparatus 100 according to Embodiment 1 shown in FIG. In FIG. 22, parts having the same configuration as in FIG.
- the FFT unit 104 performs FFT on the received signal input from the GI removal unit 103 and performs scaling with the demodulation unit 105.
- the information is output to the juling information extraction unit 107, the collision information extraction unit 109, the reception quality measurement unit 110, and the ONZ OFF control information extraction unit 2101.
- the ONZOFF control information extraction unit 2101 extracts ONZOFF control information that is information for switching between transmission and non-transmission of CQI from the reception signal input from the FFT unit 104, and outputs it to the control unit 113.
- Control section 113 receives information on the number of subcarrier blocks that transmitted CQI input from CQI generation section 111, collision information input from collision information extraction section 109, and scheduling information input from scheduling information extraction section 107 Based on the above, the number of subcarrier blocks for outputting C QI is instructed to sorting section 112.
- ONZOFF control information for stopping CQI transmission is input from ON / OFF control information extraction unit 2101
- control unit 113 outputs CQI for the number of subcarrier blocks instructed to sorting unit 112. To stop.
- ON / OFF control information for resuming CQI transmission is input from ONZOFF control information extraction unit 2101
- control unit 113 instructs resumption of CQI output for the designated number of subcarrier blocks.
- FIG. 23 is a block diagram showing the configuration of base station apparatus 2200.
- Base station apparatus 2200 according to Embodiment 7 includes, in base station apparatus 200 according to Embodiment 1 shown in FIG. 3, terminal number monitoring section 2201 and OFZOFF control information generation section as shown in FIG. Add 2202.
- FIG. 23 the same components as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.
- Error correction decoding section 206 performs error correction decoding on the received signal input from demodulation section 205, outputs the received signal to CQI extracting section 207 and terminal number monitoring section 2201, and outputs the received signal.
- Terminal number monitoring section 2201 measures the number of communication terminal apparatuses 2100 that are currently communicating at a predetermined timing from the received signal input from error correction decoding section 206. If the terminal number monitoring unit 2201 detects that the number of communication terminal devices 2100 being measured is less than the threshold force and the threshold value is exceeded, the number of communication terminal devices 2100 is the threshold value. Information indicating the above is output to the ONZOFF control information generation unit 2202. Also monitor the number of devices When the unit 2201 detects that the number of communication terminal devices 2100 being measured is greater than or equal to the threshold value and less than the threshold value, the unit 2201 indicates that the number of communication terminal device 2100s is less than the threshold value. The information is output to the ONZOFF control information generation unit 2202.
- the ONZOFF control information generation unit 2202 receives O NZOFF control information for stopping CQI transmission when information indicating that the number of communication terminal devices 2100 is equal to or greater than the threshold value is input from the terminal number monitoring unit 2201. Generated and output to multiplexing section 212. The ONZOFF control information generation unit 2202 generates ONZOFF control information that resumes CQI transmission when information indicating that the number of communication terminal devices 2100 is less than the threshold value is input from the terminal number monitoring unit 2201. And output to the multiplexing unit 212.
- Multiplexer 212 receives the transmission signal, pilot signal, collision information input from collision information generator 209, scheduling information input from scheduling information generator 211, and ONZOFF control information input from ONZO FF control information generator 2202.
- the multiplexed signal is multiplexed to generate a multiplexed signal, and the generated multiplexed signal is output to error correction coding section 213.
- FIG. 24 is a diagram showing the CQI transmission timing of each communication terminal apparatus.
- Communication terminal apparatus 2100 (1 ⁇ 1 to 1 ⁇ 3) communicates with the same base station apparatus 2200.
- the base station apparatus 2200 detects that the terminal number monitoring unit 2201 determines that the number of communication terminal apparatuses in communication is less than the value and exceeds the value, the ONZOFF control information At the time tl, the information generation unit 2202 generates ONZOFF control information for stopping CQI transmission of the communication terminal device 2100 (UE2) and the communication terminal device 2100 (UE3). Then, the base station apparatus 2200 transmits ONZOFF control information.
- the communication terminal device 2100 (UE2) and the communication terminal device 2100 (UE3) that have received the ONZOFF control information extract the ONZOFF control information by the ONZOFF control information extraction unit 2101, and the control unit 113 outputs the ONZOFF control information to the sorting unit 112.
- the time tl force also instructs the CQI output to stop.
- the communication terminal device 2100 (UE2) and the communication terminal device 2100 (UE3) also stop transmitting CQI for the time tl force.
- communication terminal apparatus 2100 (UE1) is instructed to stop CQI transmission by the ONZOFF control information, it continues!
- the ONZOFF control information generation unit 2202 transmits the communication terminal device 21 at time t2.
- ONZOFF control information for stopping CQI transmission of 00 (UE1) is generated, and ONZOFF control information for restarting CQI transmission of communication terminal apparatus 2100 (UE2) is generated.
- base station apparatus 2200 transmits ONZOFF control information.
- the communication terminal apparatus 2100 (UE1) and the communication terminal apparatus 2100 (UE2) that have received the ONZOFF control information extract the ONZOFF control information by the ON ZOFF control information extraction unit 2101.
- communication terminal apparatus 2100 (UE1) instructs control unit 113 to stop output of CQI from time t2 to sorting unit 112.
- Communication terminal apparatus 2100 instructs control unit 11 3 to resume output of CQI from time t2 to sorting unit 112. Thereby, at time t2, communication terminal apparatus 2100 (UE1) stops transmission of CQI, and communication terminal apparatus 2100 (UE2) resumes transmission of CQI. On the other hand, communication terminal apparatus 2100 (U E3) continues to stop CQI transmission because it is not instructed to resume CQI transmission by the ONZOFF control information. Thereafter, the same operation is performed at times t3, t4, and t5.
- the number of communication terminal devices is large. Since the transmission of CQI is stopped, it is possible to increase the probability of being assigned to the communication terminal apparatus that has transmitted CQI.
- the power with which the ONZOFF control information is generated based on the number of communication terminal apparatuses with which the base station apparatus is communicating is not limited to this, but the traffic status in the cell, the communication terminal apparatus
- the ONZOFF control information may be generated based on the collision status of the subcarrier block that transmitted the CQI during this period, or the allocation rate.
- the communication terminal device has the power to rearrange the CQIs by the sorting unit 112.
- the sorting unit 112 is deleted and the CQI is generated without rearranging.
- the CQI may be output from the unit 111 to the multiplexing unit 114.
- the CQI generating unit 111 may output the CQIs in an arbitrary arrangement in order from the one having the best reception quality, or sequentially output the CQIs arbitrarily selected regardless of the reception quality. You may do it.
- the CQI is transmitted based on the comparison result between the QoS requested by the communication terminal apparatus and the QoS obtained as a result of resource allocation in the base station apparatus. It is also possible to control the number of subcarrier blocks. In this case, the number of subcarrier blocks is reduced when the QoS requested by the communication terminal apparatus is satisfied, and the number of subcarrier blocks is increased when the QoS requested by the communication terminal apparatus is not satisfied.
- the communication terminal apparatus reports reception quality using CQI.
- the communication terminal apparatus is not limited to this, and the communication terminal apparatus uses any means other than CQI to receive reception quality. Can be reported.
- the base station apparatus uses the CQI report control information 400 at the time of initial reporting based on the signaling signal 300 transmitted by the communication terminal apparatus.
- the present invention is not limited to this, and the communication terminal apparatus may be instructed by the CQI report control information 400 based on the signaling signal 300 even after the initial report.
- the base station apparatus directly instructs each communication terminal apparatus on the CQI reporting cycle, time offset, and frequency range, and the base station apparatus transmits the communication terminal apparatus in a dimension such as time and frequency.
- the base station device divides the entire bandwidth into a plurality of parts, and the communication terminal devices are divided into a plurality of groups, so that communication terminal devices of different groups By allocating to different frequency ranges in advance, it is possible to suppress collisions during CQI transmission of each communication terminal device.
- the communication terminal apparatus, base station apparatus, and reception quality reporting method according to the present invention are particularly suitable for reporting reception quality on the uplink in the multicarrier transmission scheme.
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EP05772903.0A EP1909518B1 (en) | 2005-08-22 | 2005-08-22 | Communication terminal apparatus, base station apparatus and reception quality reporting method |
CN2005800513406A CN101268709B (zh) | 2005-08-22 | 2005-08-22 | 通信终端装置、基站装置以及接收质量报告方法 |
PCT/JP2005/015198 WO2007023515A1 (ja) | 2005-08-22 | 2005-08-22 | 通信端末装置、基地局装置及び受信品質報告方法 |
US12/064,610 US7986612B2 (en) | 2005-08-22 | 2005-08-22 | Communication terminal apparatus, base station apparatus and reception quality reporting method |
JP2007531960A JP4667462B2 (ja) | 2005-08-22 | 2005-08-22 | 通信端末装置、基地局装置及び受信品質報告方法 |
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Also Published As
Publication number | Publication date |
---|---|
EP1909518A1 (en) | 2008-04-09 |
US20090147869A1 (en) | 2009-06-11 |
CN101268709A (zh) | 2008-09-17 |
EP1909518A4 (en) | 2011-06-15 |
US7986612B2 (en) | 2011-07-26 |
JPWO2007023515A1 (ja) | 2009-03-26 |
CN101268709B (zh) | 2011-01-26 |
EP1909518B1 (en) | 2013-10-23 |
JP4667462B2 (ja) | 2011-04-13 |
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