WO2005078960A1 - 通信システム及び通信制御方法 - Google Patents
通信システム及び通信制御方法 Download PDFInfo
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- WO2005078960A1 WO2005078960A1 PCT/JP2005/002120 JP2005002120W WO2005078960A1 WO 2005078960 A1 WO2005078960 A1 WO 2005078960A1 JP 2005002120 W JP2005002120 W JP 2005002120W WO 2005078960 A1 WO2005078960 A1 WO 2005078960A1
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- control channel
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- power ratio
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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
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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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
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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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
- 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
- H04W52/20—TPC being performed according to specific parameters using error 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
- H04W52/18—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]
- H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
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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
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70706—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with means for reducing the peak-to-average power ratio
Definitions
- the present invention relates to an adaptive modulation communication scheme for adaptively controlling a modulation scheme and a coding rate of data transmitted from a transmission apparatus to a reception apparatus, and in particular, to a communication system using such an adaptive modulation communication scheme,
- the present invention relates to a communication control method in such a communication system, a transmission device used in such a communication system, and a transmission control method.
- AMC adaptive modulation and coding
- the multilevel number indicates how many bits are represented by one symbol in the modulated signal
- the coding rate indicates the ratio of the number of information bits to the total number of bits in the bit string after error correction coding. Therefore, when the line quality is good, the multi-level number and coding rate are large, and when the MCS is low, the multi-level number and coding rate are low. Is higher in error resilience, so the throughput is higher.
- efficient data transmission can be performed by adaptively selecting the MCS that achieves the maximum throughput according to the line quality.
- a conventional adaptive modulation communication apparatus using such an AMC is disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-84329. 1 and 2 show an example of the configuration of a conventional adaptive modulation communication device having a data transmitting device and a data receiving device.
- the data transmitting side apparatus includes an MCS determining unit 101, a control channel transmitting unit 102, a data channel transmitting unit 103, a pilot channel transmitting unit 104, a multiplexing unit 105, a wireless transmitting unit.
- the data receiving side device includes an antenna 108, a radio receiving unit 109, a pilot channel receiving processing unit 110, a control channel receiving processing unit 111, a data channel receiving processing unit 112, a control channel transmitting processing unit 113 And a pilot channel transmission processing unit 114, a multiplexing unit 115, and a radio transmission unit 116.
- a data channel is set from the transmitting device to the receiving device, and a control channel and a pilot channel are set bidirectionally between the transmitting device and the receiving device.
- MCS determining section 101 determines the MCS of the transmission data channel according to the channel quality.
- the channel quality for example, a signal to interference power ratio (SIR) is used.
- Control channel transmission processing section 102 performs processing such as coding and modulation of control information for notifying the MCS of the transmission data channel to the data receiving side device, and generates a control channel.
- Data channel transmission processing section 103 performs processing such as encoding and modulation of transmission data based on the MCS determined by MCS determination section 101 to generate a data channel.
- Pilot channel transmission processing section 104 generates a pilot channel used for timing detection, transmission path estimation, SIR measurement, and the like in the receiving-side device.
- the data channel, control channel, and pilot channel generated in this way are multiplexed in multiplexing section 105 and processed in radio transmitting section 106 such as DZA (digital Z analog) conversion and frequency conversion to a radio band. Is performed, and the data is wirelessly transmitted to the data receiving side device via the antenna 107.
- DZA digital Z analog
- pilot channel reception processing section 110 performs path timing detection and transmission path estimation of the received signal, and outputs the path timing and transmission path estimation result to control channel reception processing section 111 and data channel reception processing section 112. Further, pilot channel reception processing section 110 measures SIR from the transmission channel estimation result and outputs the result to control channel transmission processing section 113.
- Control channel reception processing section 111 performs processing such as demodulation and decoding of the control channel using the path timing and the result of channel estimation, obtains MCS information of the data channel, The CS information is output to data channel reception processing section 112.
- Data channel reception processing section 112 performs processing such as demodulation and decoding of the data channel using the path timing, transmission path estimation result, and MCS information, and outputs received data.
- Control channel transmission processing section 113 performs processing such as encoding and modulation of control information for notifying the SIR measurement result to the data transmitting side device, and generates a control channel.
- the pilot channel transmission processing section 114 generates a pilot channel used for timing detection, transmission path estimation, and the like in the data transmission side device.
- control channel and pilot channel generated in this way are multiplexed in a multiplexing section 115, and a radio transmission section 116 performs processing such as DZA conversion and frequency conversion to a radio band, and transmits data via an antenna 108. Sent by radio to the local device.
- the signal transmitted from the data receiving device is transmitted to the data transmitting device! Then, the signal is received via the antenna 107, and the radio receiving unit 117 performs processing such as frequency conversion into a baseband band and AZD conversion.
- the pilot channel reception processing section 118 of the data transmission side device detects the path timing of the received signal, estimates the transmission path, and outputs the path timing and the transmission path estimation result to the control channel reception processing section 119.
- Control channel reception processing section 119 performs processing such as demodulation and decoding of the control channel using the path timing and the result of the transmission path estimation, acquires SIR information, and outputs it to MCS determination section 101.
- Patent Document 1 JP-A-2002-84329
- the MCS information of the data channel is reported from the data transmitting device to the data receiving device, and the data receiving device transmits data based on the acquired MCS information. Demodulation and decoding. Therefore, if an error occurs in the control channel including the MCS information, demodulation and decoding of data cannot be performed, causing a problem that the throughput of the entire communication system is reduced. Also, as shown in the above-mentioned Japanese Patent Application Laid-Open No. 2002-84329, a technique of performing demodulation and decoding in a data receiving side device without notifying MCS information has been proposed. In this case, there arises a problem that the circuit scale of the data receiving device is significantly increased. To avoid these problems , It is necessary to transmit the control channel with considerably higher quality. It is a waste of resources to transmit high quality control channels at all times.
- An object of the present invention is to provide a communication system and a communication system capable of preventing a decrease in throughput and effectively using resources by transmitting a control channel with high quality only when necessary without significantly increasing the circuit scale. It is to provide a control method.
- Another object of the present invention is to provide a transmission device and a transmission control method used in such a communication system.
- a first object of the present invention is a communication system that adaptively controls a modulation scheme and a coding rate of data transmitted from a transmitting apparatus to a receiving apparatus, and the receiving apparatus measures a line quality.
- the transmission apparatus includes a channel quality measuring means for determining a control channel error, and a control channel error detecting means for detecting an error in a control channel.
- Communication including modulation control means and transmission power control means for controlling a transmission power ratio of a control channel to a data channel in accordance with a control channel error detection result notified by a receiving apparatus, a modulation scheme and a coding rate. Achieved by the system.
- a first object of the present invention is a communication control method for adaptively controlling a modulation scheme and a coding rate of data transmitted from a transmitting device to a receiving device. Measuring the quality, detecting a control channel error in the receiving device, notifying the receiving device of the line quality and control channel error to the transmitting device; and Controlling the modulation scheme and coding rate in accordance with the notified channel quality; and transmitting data in the transmitting apparatus according to the control channel error detection result and the modulation scheme and coding rate informed by the receiving apparatus. And controlling the transmission power ratio of the control channel to the channel.
- a second object of the present invention is a transmitting apparatus that adaptively controls a modulation scheme and a coding rate of data transmitted to a receiving apparatus, and performs modulation according to the line quality notified of the receiving apparatus power.
- Adaptive modulation control means for controlling the scheme and coding rate; and a control channel error detection result notified from the receiving apparatus and a data channel corresponding to the modulation scheme and coding rate.
- Transmission power control means for controlling the transmission power ratio of the control channel.
- a second object of the present invention is a transmission control method in a transmitting apparatus that adaptively controls a modulation scheme and a coding rate of data transmitted to the receiving apparatus. Controlling the modulation scheme and the coding rate according to the control channel error detection result notified from the receiving apparatus and controlling the transmission power ratio between the control channel and the data channel according to the modulation scheme and the coding rate. And a transmission control method including the steps of:
- the transmission power of the control channel is increased or decreased according to the error rate or the channel quality. Specifically, by setting the appropriate control channel transmission power according to the MCS that reflects the quality, and increasing or decreasing the control channel transmission power according to the control channel error rate, the control channel is raised only when necessary. We try to transmit with quality. As a result, according to the present invention, it is possible to prevent a decrease in data channel throughput due to a control channel error at the time of low quality, and to suppress the power of the control channel at the time of high quality. Effective utilization can be achieved.
- FIG. 1 is a block diagram showing an example of a configuration of a transmitting device in a conventional adaptive modulation communication device.
- FIG. 2 is a block diagram showing an example of a configuration of a receiving side device in a conventional adaptive modulation communication device.
- FIG. 3 is a block diagram showing a configuration of a transmitting apparatus in the adaptive modulation communication apparatus according to one embodiment of the present invention.
- FIG. 4 is a block diagram showing a configuration of a receiving device in the adaptive modulation communication device according to the embodiment of the present invention.
- FIG. 5 is a diagram showing an example of a correspondence between SIR and MCS.
- FIG. 6 is a block diagram showing a configuration of a transmission power determining unit in the transmitting apparatus shown in FIG. 3.
- FIG. 7 shows a configuration of a control channel transmission processing unit in the transmitting apparatus shown in FIG. It is a block diagram.
- FIG. 8 is a block diagram showing a configuration of a pilot channel reception processing section in the receiving apparatus shown in FIG.
- FIG. 9 is a block diagram showing a configuration of a control channel reception processing unit in the receiving device shown in FIG.
- FIG. 10 is a flowchart showing a process of determining a transmission power ratio of a control channel and a pilot channel to a data channel.
- FIG. 11 is a graph showing an example of a relationship between a control channel error rate and an increase / decrease of a transmission power ratio of a control channel and a pilot channel to a data channel.
- FIG. 12 is a graph showing an example of a relationship between a transmission power ratio of a control channel and a pilot channel to a data channel and MCS.
- the adaptive modulation communication apparatus of the embodiment includes a transmitting apparatus and a receiving apparatus, and wirelessly transmits data from the transmitting apparatus to the receiving apparatus.
- the transmitting apparatus includes an MCS determining unit 1, a control channel transmission processing unit 2, a data channel transmission processing unit 3, a pilot channel transmission processing unit 4, a multiplexing unit 5, a radio transmission unit 6, an antenna 7, a radio reception unit 17, a pilot channel reception processing unit 18, a control channel reception processing unit 19, a transmission power determination unit 20, and multiplication units 21 and 22.
- the receiving device includes an antenna 8, a radio receiving unit 9, a pilot channel receiving processing unit 10, a control channel receiving processing unit 11, a data channel receiving processing unit 12, a control channel transmitting processing unit 13, It has a pilot channel transmission processing unit 14, a multiplexing unit 15, and a radio transmission unit 16.
- Transmission device power A data channel is set for the reception device, and a control channel and a pilot channel are set bidirectionally between the transmission device and the reception device.
- MCS determining section 1 of the transmitting device determines the MCS of the transmission data channel according to the channel quality measured by the receiving device.
- An example of the line quality is SIR.
- four types of thresholds Th (O) —Th (3) and five types of MCS combinations Assume that MCS (0) and MCS (4) are set in advance.
- Each of MCS (0) and MCS (2) has a different power coding rate R using QPSK (Quadrature Phase Shift Keying) as a modulation scheme.
- MCS (3) uses 16QAM as the modulation method
- the transmission power determination unit 20 determines the transmission power for the data channel of the control channel from the transmission device to the reception device according to the MCS determined by the MCS determination unit 1 and the control channel error detection result notified from the reception device.
- the ratio and the transmission power ratio of the pilot channel from the transmitting device to the receiving device for the data channel are determined.
- the transmission power of the pilot channel is controlled similarly to the transmission power of the control channel, and the transmission power ratio of the control channel to the data channel and the transmission power ratio of the pilot channel to the data channel are the same. It is to be.
- the transmission power of the control channel and the pilot channel from the transmission device to the reception device are both controlled in the form of a ratio to the transmission power of the data channel based on the transmission power ratio determined in this way.
- the transmission power determination unit 20 includes a transmission power ratio update unit 61 and a transmission power ratio determination unit 62, as shown in FIG.
- the transmission power ratio update unit 61 the transmission power ratio of the control channel and the pilot channel for the data channel is set for each MCS.
- the transmission power ratio updating unit 61 periodically updates the transmission power ratio according to the control channel error detection result.
- Transmission power ratio determining section 62 determines a transmission power ratio according to the MCS, and outputs transmission power ratio information and a transmission power coefficient. As described later, the transmission power ratio information is transmitted to the receiving device via the control channel.
- the transmission power coefficient is obtained by multiplying the control channel and the pilot channel by amplitude, and is represented by the square root of the transmission power ratio represented by an exact value.
- the control channel transmission processing unit 2 generates a control channel by performing processing such as coding and modulation of control information.
- the control information consists of the MCS of the transmission data channel and the control channel. This is for notifying the receiving device of the transmission power ratio of the data channel of the channel and the pilot channel to the receiving device. Therefore, control channel transmission processing section 2 receives the MCS information from MCS determination section 1 and the transmission power ratio information from transmission power determination section 20.
- an error detection code unit 31 an error correction code unit 32, and a modulation unit 33 are connected in series.
- the control information is encoded by an error detection encoder 31 and an error correction encoder 32, and the encoded control information is modulated by a modulator 33, thereby generating a control channel.
- the error detection code is, for example, a CRC (Cyclic Redundancy Check) code
- the error correction code is, for example, a convolutional code.
- the generated control channel is sent to the multiplier 21.
- the data channel transmission processing unit 3 performs processing such as encoding and modulation of transmission data based on the MCS determined by the MCS determination unit 1 to generate a data channel.
- the transmission data is input to the data channel transmission processing unit 3, and the MCS information is input from the MCS determination unit 1.
- the generated data channel is sent to the multiplexing unit 5.
- the pilot channel transmission processing unit 4 generates a pilot channel used for timing detection, transmission path estimation, SIR measurement, and the like in the receiving apparatus.
- the generated pilot channel is sent to the multiplier 22.
- Multiplication section 21 multiplies the control channel by the transmission power system number of the control channel, and outputs the result to multiplexing section 5.
- multiplying section 22 multiplies the pilot channel by the transmission power coefficient of the pilot channel, and outputs the result to multiplexing section 5.
- the transmission power coefficients of the control channel and the pilot channel are determined based on the transmission power ratio of the control channel and the pilot channel to the data channel, respectively.
- the multiplexing unit 5 multiplexes the data channel output from the data channel transmission processing unit 3, the control channel output from the multiplication unit 21, and the pilot channel output from the multiplication unit 22.
- the multiplexed data is subjected to processing such as DZA conversion and frequency conversion to a wireless band in a wireless transmission unit 6, and is transmitted as a wireless signal to a receiving device via an antenna 7.
- the antenna 7 has a function of transmitting an output from the wireless transmission unit 6 to the receiving device and receiving a signal transmitted from the receiving device.
- the received signal is transmitted from antenna 7 to radio receiving apparatus.
- the received radio signal is transmitted to the reception unit 17, and the radio reception unit 17 performs processing such as frequency conversion of the received radio signal into a baseband band, AZD conversion, and the like.
- the pilot channel reception processing unit 18 detects the path timing of the received signal, estimates the transmission path, and outputs the path timing and the result of the transmission path estimation to the control channel reception processing unit 19.
- the control channel reception processing unit 19 performs processing such as demodulation and decoding of the control channel using the results of path timing and channel estimation, obtains SIR information and a control channel error detection result, and sends the SIR information to the MCS determination unit 1. And outputs the control channel error detection result to the transmission power determination unit 20.
- the signal transmitted from the transmitting device is received by the receiving device via antenna 8 and sent to radio receiving section 9.
- the antenna 8 has a function of transmitting an output from the wireless transmission unit 16 to the transmitting device side in addition to a function of receiving a signal from the transmitting device.
- the wireless receiving unit 9 performs processing such as frequency conversion of the received wireless signal into a baseband band, AZD conversion, and the like, and outputs the processed signal to a pilot channel reception processing unit 10, a control channel reception processing unit 11, and It is sent to the data channel reception processing unit 12.
- Pilot channel reception processing section 10 performs path timing detection and transmission path estimation of the received signal, and outputs the path timing and transmission path estimation result to control channel reception processing section 11 and data channel reception processing section 12. Further, pilot channel reception processing section 10 measures the SIR of the data channel from the transmission channel estimation result and the transmission power ratio, and outputs it to control channel transmission processing section 13. As shown in FIG. 8, pilot channel reception processing section 10 includes a noise timing detection section 41 and a transmission path estimation ZSIR measurement section 42. The nos timing detector 41 calculates the correlation value between the received pilot channel and a plurality of known pilot symbols every moment, detects a timing with a high correlation value, and outputs it as a path timing.
- the channel estimation ZSIR measurement unit 42 multiplies the conjugate of the known pilot symbol for each symbol of the pilot channel based on the path timing, and calculates and outputs the channel estimation value and SIR from the average and variance of each symbol. .
- the transmission path estimation ZSIR measurement unit 42 the transmission path estimation value for the data channel reception processing and the SIR indicating the channel quality of the data channel are corrected based on the transmission power ratio information and output. Therefore, as described below, pilot channel reception processing section 10 includes control channel reception processing. Control section 11 Power Transmission power ratio information is input.
- Control channel reception processing section 11 performs processing such as demodulation and decoding of the control channel using the path timing and the transmission path estimation result output from pilot channel reception processing section 10, and transmits the MCS information of the data channel and the transmission.
- the power ratio information is obtained, the MCS information is output to the data channel reception processing unit 12, the transmission power ratio information is output to the pilot channel reception processing unit 10 and the data channel reception processing unit 12, and the control channel error detection result is further controlled.
- a demodulation section 51, an error correction decoding section 52, and an error correction decoding section 53 are connected in series.
- the demodulation unit 51 demodulates the control channel using the path timing and the transmission path estimation result.
- the error correction decoding unit 52 performs decoding on the demodulated control channel using, for example, a Viterbi decoder.
- the error detection decoding unit 53 detects the presence or absence of an error by using, for example, a CRC for the output of the error correction decoding unit 52, and outputs a control channel error detection result and decoded control information. If an error is detected in the control channel, control information cannot be obtained, so error detection decoding section 53 outputs the previously received control information.
- the data channel reception processing unit 12 demodulates the data channel using the path timing and transmission path estimation result from the pilot channel reception processing unit 10, and the MCS information and the transmission power ratio information from the control channel reception processing unit. , And performs processing such as decoding, and outputs received data.
- Control channel transmission processing section 13 performs processing such as encoding and modulation of control information for notifying the transmission device, and generates a control channel.
- the control information notified to the transmitting device includes an SIR measurement result from pilot channel reception processing section 10 and a control channel error detection result from control channel reception processing section 11.
- the generated control channel is sent to the multiplexing unit 15.
- Pilot channel transmission processing section 14 generates a pilot channel used for timing detection, transmission path estimation, and the like in the transmitting apparatus, and outputs the generated pilot channel to multiplexing section 15.
- the multiplexing unit 15 multiplexes the control channel and the pilot channel generated in this way.
- the multiplexed data is subjected to processing such as DZA conversion and frequency conversion to a wireless band in a wireless transmission unit 16, and is transmitted as a wireless signal to a transmission device via an antenna 8. Is done.
- FIG. 10 shows the operation of the transmission power determination unit 20.
- i 0, 1, 2, 3, and 4, and it is assumed that MCS (i) has been input as the MCS.
- S (i) represents the number of times MCS (i) is determined, and NG SMCSGWS represents the number of control channel errors when it is determined.
- the initial value of both S (i) and N (i) is 0.
- E (i) is the control channel error rate when MCS (i) is determined
- Smax is the number of samples when calculating the control channel error rate E (i)
- E-up is the transmission
- E-down is a threshold value when it is determined to increase the power ratio
- E-down is a threshold value when it is determined to decrease the transmission power ratio.
- E_up E-down.
- P (i) is a transmission power ratio when MCS (i) is determined, and its initial value is a value given in advance.
- P—high (i) indicates the upper limit of the variable range of the transmission power ratio when MCS (i)
- P—low (i) indicates the lower limit of the variable range of the transmission power ratio when MCS (i). Indicates the value.
- P—high (i) ⁇ P—low (i). ⁇ -up indicates an increase in the transmission power ratio
- ⁇ P-down indicates a decrease in the transmission power ratio.
- step 71 the MCS (i) and the control channel error detection result information are input to the transmission power determining unit 20, and in step 72, the number of times MCS (i) is determined S (i) force S is incremented.
- step 73 the presence or absence of a control channel error is identified. If there is a control channel error here, the number N (i) of control channel errors at the time of MCS (i) is incremented in step 74, and the process proceeds to step 75. If there is no error in step 73, the process proceeds to step 75.
- step 75 S (i) is compared with the number of samples Smax for calculating the number of control channel errors, and if S (i) ⁇ Smax, the process proceeds to step 81 to wait for the next input. I do.
- V and E (i) are calculated and compared with the value E_up. [0043]
- E (i)> E-up then the force for shifting to the transmission power ratio increase determination processing shown in steps 82-84 should be E (i) ⁇ E-up.
- step 78 E (i) is compared to a threshold value E—down. If E (i) ⁇ E—down in step 78, the power to shift to the transmission power ratio decrease determination processing shown in steps 85—87 If E (i) ⁇ E_down, the transmission power ratio P (i) Do not update and go to step 79.
- step 82 the transmission power ratio increase width ⁇ P-up is added to the current transmission power ratio P (i), and is compared with the upper limit value P-high (i) at the time of MCS (i). If P (i) + ⁇ -up ⁇ P-high (i), in step 83, P (i) is updated to P_high (i), and thereafter, the process proceeds to step 79. On the other hand, go to step 82! If P (i) + ⁇ P_up ⁇ P_high (i), then go to step 84! /, And update P (i) to P (i) + ⁇ _ ⁇ ⁇ , and then go to step 79.
- step 85 the transmission power ratio decrease ⁇ P-down is subtracted from the current transmission power ratio P (i), and is compared with the lower limit value P-low (i) at the time of MCS (i). If P (i) — ⁇ —down ⁇ P—low (i), in step 86, P (i) is updated to P—low (i), and the process proceeds to step 79. On the other hand, if P (i) —AP—down> P—low (i) in step 82, P (i) is updated to P (i) — ⁇ ⁇ —down in step 87, and step 79 Move to
- step 79 the control information transmitted to the control channel transmission processing unit 2 is output to the control channel transmission processing unit 2 as control information notified to the P (i) power receiving apparatus updated or maintained as described above, and the control channel and pilot channel It is output to multipliers 21 and 22 as a transmission power coefficient for controlling the transmission power (step 79).
- step 80 both S (i) and N (i) are initialized to 0, and the process proceeds to step 81 to wait for the next input.
- transmission power determination section 20 in the transmission apparatus controls the control channel and pilot channel transmission power.
- FIG. 11 shows the relationship between E (i) and E-up and E-down in the above-described processing. Depending on the magnitude relationship between E (i) and E-up, E-down, processing to increase, maintain, or decrease the power ratio is performed.
- FIG. 12 shows the relationship between P (i) and P—high (i), P_low (i).
- the transmission power ratio is It varies within the transmission power ratio variable range that is set independently for each MCS according to the control channel error rate. For example, when MCS (O) is used for poor quality, a larger transmission power ratio can be set, and when MCS (4) is used for good quality, a smaller transmission power ratio can be set. , It is possible to transmit control channels with high quality only when necessary and to use resources effectively.
- the transmission power ratio of the control channel to the data channel is the same as the transmission power ratio of the pilot channel to the data channel.
- the control channel can be demodulated even if the transmission power ratio of the control channel is not the same as the transmission power ratio of the pilot channel. Therefore, the transmission power ratio of the control channel to the data channel and the transmission power ratio of the pilot channel to the data channel may be controlled independently, or the transmission power ratio of the pilot channel to the data channel may be fixed. Alternatively, only the transmission power ratio of the control channel to the data channel may be controlled.
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JP2005517989A JP4626766B2 (ja) | 2004-02-12 | 2005-02-14 | 通信システム及び通信制御方法 |
US10/597,924 US20070183442A1 (en) | 2004-02-12 | 2005-02-14 | Communications system and communication control method |
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WO (1) | WO2005078960A1 (ja) |
Cited By (4)
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JP2009010683A (ja) * | 2007-06-28 | 2009-01-15 | Kyocera Corp | 無線通信方法および無線通信装置 |
JP2010187275A (ja) * | 2009-02-13 | 2010-08-26 | Nec Corp | データ転送無線基地局システム、端末機器、映像撮影機能付き端末機器、Femto基地局、映像データの処理方法、及びプログラム |
JP2012235491A (ja) * | 2012-07-02 | 2012-11-29 | Kyocera Corp | 無線通信方法および無線通信装置 |
CN112119662A (zh) * | 2018-05-17 | 2020-12-22 | 高通股份有限公司 | 传输功率配置 |
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KR100849330B1 (ko) * | 2004-09-02 | 2008-07-29 | 삼성전자주식회사 | 무선 통신 시스템에서 적응 송수신 장치 및 방법 |
JP4642679B2 (ja) * | 2006-03-14 | 2011-03-02 | 富士通株式会社 | 無線通信装置及び無線通信方法 |
KR20080070366A (ko) * | 2007-01-26 | 2008-07-30 | 엘지전자 주식회사 | 데이터 인코딩/디코딩 방법 및 장치와, 데이터 기록/재생방법 및 장치 |
ATE526735T1 (de) * | 2006-10-30 | 2011-10-15 | Mitsubishi Electric Corp | Verfahren und vorrichtung zur übertragung während des schutzintervalles |
JPWO2009025251A1 (ja) * | 2007-08-20 | 2010-11-25 | 日本電気株式会社 | 基地局、移動局およびサブキャリアのマッピング方法 |
US10368318B2 (en) * | 2010-12-30 | 2019-07-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Wireless operation in very high density environments |
JP5473955B2 (ja) * | 2011-01-27 | 2014-04-16 | 京セラ株式会社 | 通信装置および通信方法 |
WO2016136491A1 (ja) * | 2015-02-23 | 2016-09-01 | 京セラ株式会社 | 送信装置及び受信装置 |
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WO2003034577A1 (en) * | 2001-10-16 | 2003-04-24 | Koninklijke Philips Electronics N.V. | Method and apparatus for near losslessly measuring inductor current |
JP2004040187A (ja) * | 2002-06-28 | 2004-02-05 | Matsushita Electric Ind Co Ltd | 送信電力制御方法、シグナリング方法、通信端末装置及び基地局装置 |
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CN1228952C (zh) * | 2001-08-28 | 2005-11-23 | 索尼公司 | 发射机和发射控制方法 |
EP1437873B1 (en) * | 2001-10-17 | 2009-11-25 | Sony Corporation | Transmitter and transmission control method |
JP4288093B2 (ja) * | 2003-04-09 | 2009-07-01 | 株式会社エヌ・ティ・ティ・ドコモ | 無線通信制御システム及び無線通信制御方法 |
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2005
- 2005-02-14 JP JP2005517989A patent/JP4626766B2/ja not_active Expired - Fee Related
- 2005-02-14 US US10/597,924 patent/US20070183442A1/en not_active Abandoned
- 2005-02-14 WO PCT/JP2005/002120 patent/WO2005078960A1/ja active Application Filing
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WO2003034577A1 (en) * | 2001-10-16 | 2003-04-24 | Koninklijke Philips Electronics N.V. | Method and apparatus for near losslessly measuring inductor current |
JP2004040187A (ja) * | 2002-06-28 | 2004-02-05 | Matsushita Electric Ind Co Ltd | 送信電力制御方法、シグナリング方法、通信端末装置及び基地局装置 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009010683A (ja) * | 2007-06-28 | 2009-01-15 | Kyocera Corp | 無線通信方法および無線通信装置 |
JP2010187275A (ja) * | 2009-02-13 | 2010-08-26 | Nec Corp | データ転送無線基地局システム、端末機器、映像撮影機能付き端末機器、Femto基地局、映像データの処理方法、及びプログラム |
JP2012235491A (ja) * | 2012-07-02 | 2012-11-29 | Kyocera Corp | 無線通信方法および無線通信装置 |
CN112119662A (zh) * | 2018-05-17 | 2020-12-22 | 高通股份有限公司 | 传输功率配置 |
CN112119662B (zh) * | 2018-05-17 | 2023-09-29 | 高通股份有限公司 | 传输功率配置 |
Also Published As
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US20070183442A1 (en) | 2007-08-09 |
JPWO2005078960A1 (ja) | 2007-10-18 |
JP4626766B2 (ja) | 2011-02-09 |
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