WO2001048951A1 - Terminal et procede amcr - Google Patents
Terminal et procede amcr Download PDFInfo
- Publication number
- WO2001048951A1 WO2001048951A1 PCT/JP2000/009001 JP0009001W WO0148951A1 WO 2001048951 A1 WO2001048951 A1 WO 2001048951A1 JP 0009001 W JP0009001 W JP 0009001W WO 0148951 A1 WO0148951 A1 WO 0148951A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power
- transmission power
- transmission
- reception
- communication terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/18—TPC being performed according to specific parameters
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/228—TPC being performed according to specific parameters taking into account previous information or commands using past power values or information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
- H04W52/32—TPC of broadcast or control channels
- H04W52/325—Power control of control or pilot channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
- H04W52/60—Signalisation aspects of the TPC commands, e.g. frame structure using different transmission rates for TPC commands
Definitions
- the CDMA (Code Division Multiple Access) method is a method of transmitting information by spreading it over a band that is sufficiently wider than the minimum required bandwidth, and is excellent in confidentiality, confidentiality, and anti-interference.
- Communication system that can achieve higher frequency use efficiency than the FDMA (Frequency Division Multiple Access) system and the TDMA (Time Division Multiple Access) system, and can accommodate more users. it can.
- the analog receiver 12 performs processing such as amplification and frequency conversion on the multiplexed signal from the plurality of mobile stations 20 received by the antenna 11, and sends the processed signal to the digital receiver 13 for each mobile station 20. Supply.
- the digital receiver 13 separates the signal of the mobile station 20 from the multiplexed received signal by performing correlation detection using the spreading code used for the mobile station 20 that performs reception. It is supplied to the baseband processing circuit 14 and the reception power detection circuit 15.
- the baseband processing circuit 14 obtains reception data from the separated signal, and supplies the transmission data to the mobile station 20 to the modulator 16 as a transmission signal.
- the reception level detection circuit 15 measures the level of the signal received from the mobile station 20, generates a transmission power control (hereinafter referred to as “TPC”) bit in accordance with the measured level, and generates a modulator 16. To supply.
- TPC bit is used for adjusting the transmission power of the mobile station 20.
- Modulator 16 multiplies the transmission signal from baseband processing circuit 14 and the TPC bit from reception power detection circuit 15 by the spreading code assigned to mobile station 20 to adder 17 Output to
- Adder 17 multiplexes spread signals output from modulators 16 for mobile stations 20.
- the signal multiplexed by the adder 17 is wirelessly transmitted from the antenna 11 through processing such as conversion to an RF (Radio Frequency) frequency and amplification.
- RF Radio Frequency
- the analog receiver 22 performs processing such as amplification and frequency conversion on the signal from the base station 10 received by the antenna 21 and supplies the signal to the digital receiver 23. Also, analog reception The device 22 has a circuit for measuring the total power level of the received signal, and supplies the measured electric level to the transmission level control circuit 26.
- the modulator 25 spreads the transmission signal from the baseband processing circuit 24 with the assigned spreading code and supplies the spread signal to the transmission level control circuit 26.
- the transmission level control circuit 26 controls the transmission power of the spread signal using the total power level from the analog receiver 22 and the TPC bit extracted from the received signal.
- the output signal of the transmission level control circuit 26 is wirelessly transmitted from the antenna 21 through processing such as conversion into RF frequency and amplification.
- the transmission power control method in the above-described CDMA communication system is as follows. First, the transmission power level is controlled using the total power level measured by the analog receiver 22 of the mobile station 20. It compensates for the median variation of the received power of the base station 10 due to the change in the distance from the base station 10 due to the position variation. This method is called an open loop transmission power control method.
- the TPC bit is determined to lower the level of the mobile station 20 and transmitted to the mobile station 20.
- a transmission power control method using an open loop and a closed loop is used in the uplink.
- the base station performs closed-loop transmission power control on the uplink using SIR (desired wave-to-interference wave power ratio)
- the frequency utilization efficiency can be improved as compared with the case where reception power is used.
- the transmission power of the data section is changed according to the rate.
- the transmission power of the TPC bit is kept constant.
- FIGS. 2A to 2D are transmission signal power diagrams in the variable rate speech coding scheme.
- the voice coded data (transmitted data) 31 to 34 are framed in units of about 20 ms, and the rate changes in frame units depending on the presence or absence of voice. .
- the transmission power is also changed according to the rate that changes to the maximum rate (Fig. 2A), 1Z2 rate (Fig. 2B), 1Z4 rate (Fig. 2C), 1/8 rate (Fig. 2D) with sound.
- Fig. 2A maximum rate
- Fig. 2B 1Z2 rate
- Fig. 2C 1/8 rate
- Fig. 2D 1/8 rate
- the mobile station 20 changes the rate whether the cause of the change in the measured reception power is due to the propagation loss of the radio propagation path. There is a problem that it is not possible to determine whether or not this has occurred.
- An object of the present invention is to provide a CDMA communication terminal capable of accurately measuring received power for a signal whose transmission power fluctuates according to a variable rate, and appropriately performing transmission power control based on the measurement result.
- a device and a CDMA communication method are provided.
- This object is achieved by obtaining the received power by adding the amount of change in the received power of the pilot channel to the received power of the previous slot in which the amount of change in the transmitted power is corrected.
- FIG. 1 is a block diagram showing the configuration of a conventional CDMA communication system
- Fig. 2A is a conceptual diagram of variable rate transmission in a conventional CDMA communication system
- Fig. 2B is a conceptual diagram of variable rate transmission in a conventional CDMA communication system
- Fig. 2C is a variable rate transmission in a conventional CDMA communication system
- 2D is a conceptual diagram of variable rate transmission in a conventional CDMA communication system
- FIG. 3 is a block diagram showing a configuration of a mobile station in a CDMA communication system according to Embodiment 1 of the present invention.
- FIG. 5 is a block diagram showing a configuration of a mobile station in a CDMA communication system according to Embodiment 2 of the present invention.
- an unmodulated pilot channel is transmitted on the downlink from a base station to a mobile station, and all mobile stations communicating with the base station receive this pilot channel.
- a method of channel estimation for data demodulation and timing synchronization acquisition and retention of spreading codes has been adopted.
- the transmission power of the pilot channel is constant. Since the pilot channel and the TPC bit pass through the same propagation path, their fluctuation amounts are equal.
- the TPC bits are transmitted at a rate of one bit per slot, whereas the pilot channel is transmitted at a constant power over the entire slot section.
- the antenna 101 receives radio waves transmitted from the base station of the communication partner, and wirelessly transmits a signal output from the transmission RF unit 117 to the base station.
- the reception RF section 102 performs frequency conversion and amplification on the signal received by the antenna 101.
- the AD conversion unit 103 converts the analog signal output from the reception RF unit 102 into a digital signal.
- the data correlator 104 despreads the output signal of the AD conversion section 103 with the same spreading code as that multiplied by the base station, and the demodulator 106 receives the data. Output to the transmission power measuring device 108 and the TPC bit received power measuring device 109.
- the pilot channel correlator 105 despreads the output signal of the AD converter 103 with a pilot channel spreading code, and the demodulator 106 and the pilot channel reception power measuring device 1 Output to 10
- the data reception power measuring device 108 measures the reception power of the data part of the signal output from the data correlator 104 and outputs it to the reception power measuring device 111.
- TPC bit received power measuring instrument 109 measures the received power of the TPC bit portion below the signal output from data correlator 104, and outputs it to received power measuring instrument 111.
- Pilot channel received power measuring instrument 110 measures the received power of pilot channel output from data correlator 105 and outputs it to received power measuring instrument 111.
- the TPC bit generator 112 compares the received power output from the received power meter 111 with a threshold value that satisfies the desired quality in advance, thereby increasing or decreasing the transmission power relative to the base station. Is generated and output to the frame configuration unit 114.
- the signal transmitted from the base station and received by the antenna 101 is frequency-converted and amplified by the reception RF section 102, and then converted into a digitized signal (data) by the AD conversion section 103. And output to pilot channel correlator 105.
- the data correlator 104 performs despreading with the same data spreading code multiplied by the base station, and outputs a demodulator 106, a data reception power measuring device 108, and Is output to the unit reception power measuring device 109.
- pilot channel correlator 105 the received signal after AD conversion is despread with a pilot channel spreading code, and output to demodulator 106 and pilot channel received power measuring device 110. You.
- the demodulator 106 performs demodulation and multi-path synthesis on the data output from the demodulator correlator 104 based on the output timing of the pilot channel correlator 105. After that, it is output to the decoder 107.
- the decoder 107 decodes the data output from the demodulator 106 to output the received data.
- the reception power of the data part of the signal output from the data correlator 104 is measured and output to the reception power measuring device 111.
- the TPC bit received power measuring device 109 measures the received power of the downlink TPC bit portion of the signal output from the de-correlation correlator 104 and outputs it to the received power measuring device 111.
- the pilot channel received power measuring device 110 measures the received power of the pilot channel output from the pilot channel correlator 105 and outputs it to the received power measuring device 111.
- the corrected received power is obtained based on the received power of the TPC bit portion, the received power of the data portion, and the received power of the pilot channel, and is output to the TPC bit generator 112. .
- the PC bit generator 1 1 2 compares the received power with a threshold value that has been determined in advance to satisfy the required quality, generates an uplink TPC bit that instructs the base station to increase or decrease the transmission power, and generates a frame configuration. Output to section 1 1 4.
- FIG. 4A is a received signal power diagram showing the received power of pilot channel 201 output from pilot channel received power measuring device 110 over time
- FIG. 4B is a received signal power diagram output from data received power measuring device 108
- FIG. 7 is a received signal power diagram showing the received power of the TPC bit 203 output from the data receiver 202 and the TPC bit received power measuring device 109 over time.
- one frame is composed of n slots (n is a natural number of 2 or more), and the received power of pilot channel 201 and the received power of data 202 are averaged over the slot section. It was done.
- the average received power value of data 202 is about 1/2 of the average received power value of TPC bit 203, so the rate is 1Z2 Can be determined.
- the difference between the received power of the pilot channel in the first slot of frame B and the received power of the pilot channel in the nth slot of frame A is P di
- the reception of the first slot in frame B is Power P to P.
- Pd the difference between the received power of the pilot channel in the first slot of frame B and the received power of the pilot channel in the nth slot of frame A
- FIG. 5 is a block diagram showing a configuration of a CDMA communication terminal apparatus according to Embodiment 2 of the present invention.
- the same components as those of the CDMA communication terminal apparatus 100 shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.
- received power measuring apparatus 301 uses the received signal rate determined by decoder 107 to measure the received power, the average frame received power and the TPC bit described in Embodiment 1 for the data section will be described.
- the rate can be determined with higher accuracy than when the rate is determined using a comparison with the frame average received power.
- the received power is obtained by adding the difference of the slot channel average received power of the pilot channel to the frame average corrected received power.
- the pilot channel transmitted at a constant power depends on the control. There is a difference by the amount of the change.
- Embodiment 3 solves this problem and describes how to measure received power with higher accuracy.
- the CDMA communication terminal apparatus 400 shown in FIG. 6 uses the uplink TPC bit generated by the TPC bit generator 112 in the reception power measuring device 401 as compared with the CDMA communication terminal apparatus 100 of the first embodiment. Measurement of received power.
- the present invention is not limited to this, and the SIR may be measured and the STP and a threshold may be compared to generate the up TPC bit.
- the present invention is suitable for use in cellular systems such as digital car phones and mobile phones.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020017010776A KR20010102373A (ko) | 1999-12-24 | 2000-12-19 | Cdma 통신 단말 장치 및 cdma 통신 방법 |
| EP00981832A EP1156600A1 (en) | 1999-12-24 | 2000-12-19 | Cdma terminal and cdma method |
| AU18950/01A AU1895001A (en) | 1999-12-24 | 2000-12-19 | Cdma terminal and cdma method |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11/366309 | 1999-12-24 | ||
| JP36630999A JP2001186082A (ja) | 1999-12-24 | 1999-12-24 | Cdma移動通信システム及び方法 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2001048951A1 true WO2001048951A1 (fr) | 2001-07-05 |
Family
ID=18486463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2000/009001 Ceased WO2001048951A1 (fr) | 1999-12-24 | 2000-12-19 | Terminal et procede amcr |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20020136186A1 (ja) |
| EP (1) | EP1156600A1 (ja) |
| JP (1) | JP2001186082A (ja) |
| KR (1) | KR20010102373A (ja) |
| CN (1) | CN1341300A (ja) |
| AU (1) | AU1895001A (ja) |
| WO (1) | WO2001048951A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100448300C (zh) * | 2001-09-07 | 2008-12-31 | Lg电子株式会社 | 移动通信系统中可变数据速率模式下调整信号功率的方法 |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100678150B1 (ko) * | 2000-06-29 | 2007-02-01 | 삼성전자주식회사 | 부호분할 다중접속 시스템의 링크적응 시스템 및 방법 |
| US8504054B2 (en) | 2002-09-10 | 2013-08-06 | Qualcomm Incorporated | System and method for multilevel scheduling |
| US7630321B2 (en) * | 2002-09-10 | 2009-12-08 | Qualcomm Incorporated | System and method for rate assignment |
| US8165148B2 (en) | 2003-01-13 | 2012-04-24 | Qualcomm Incorporated | System and method for rate assignment |
| US7149538B2 (en) * | 2003-02-13 | 2006-12-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Wireless transceivers, methods, and computer program products for restricting transmission power based on signal-to-interference ratios |
| US6958982B2 (en) * | 2003-07-16 | 2005-10-25 | Interdigital Technology Corporation | Method and apparatus for storing mobile station physical measurements and MAC performance statistics in a management information base of an access point |
| US7555074B2 (en) * | 2005-02-01 | 2009-06-30 | Telefonaktiebolaget L M Ericsson (Publ) | Interference estimation in the presence of frequency errors |
| CN101090281B (zh) * | 2007-06-19 | 2010-06-02 | 中兴通讯股份有限公司 | 一种上行随机接入前导序列选择方法 |
| CN109417408B (zh) * | 2016-07-13 | 2021-10-26 | 索尼公司 | 无线通信设备和无线通信方法 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0613956A (ja) * | 1992-06-29 | 1994-01-21 | Mitsubishi Electric Corp | 移動体通信における送信電力制御装置およびシステム |
| JPH08130535A (ja) * | 1994-11-02 | 1996-05-21 | Nec Corp | 送信ビットレート判別方法及び装置 |
| JPH08149567A (ja) * | 1994-11-16 | 1996-06-07 | Nec Corp | データレート検出器 |
| JPH10145245A (ja) * | 1996-11-11 | 1998-05-29 | Y R P Ido Tsushin Kiban Gijutsu Kenkyusho:Kk | 可変データレート通信装置 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5802110A (en) * | 1994-02-16 | 1998-09-01 | Matsushita Electric Industrial Co., Ltd. | Wireless mobile system |
| JP2877248B2 (ja) * | 1994-05-20 | 1999-03-31 | エヌ・ティ・ティ移動通信網株式会社 | Cdmaシステムにおける送信電力制御方法および装置 |
| JP3254390B2 (ja) * | 1996-10-18 | 2002-02-04 | 三菱電機株式会社 | 送信電力制御装置 |
| JPH1198032A (ja) * | 1997-07-19 | 1999-04-09 | Matsushita Electric Ind Co Ltd | Cdma通信装置及びcdma通信方法 |
| CA2236066A1 (en) * | 1997-07-19 | 1999-01-19 | Mitsuru Uesugi | Cdma communication system and apparatus |
| JP3904716B2 (ja) * | 1998-03-10 | 2007-04-11 | 松下電器産業株式会社 | Cdma移動通信システム |
| JP3286247B2 (ja) * | 1998-05-08 | 2002-05-27 | 松下電器産業株式会社 | 無線通信システム |
| MY130820A (en) * | 1998-12-16 | 2007-07-31 | Ericsson Telefon Ab L M | Channel estimation for a cdma system using pre-defined symbols in addition to pilot symbols |
-
1999
- 1999-12-24 JP JP36630999A patent/JP2001186082A/ja active Pending
-
2000
- 2000-12-19 KR KR1020017010776A patent/KR20010102373A/ko not_active Ceased
- 2000-12-19 EP EP00981832A patent/EP1156600A1/en not_active Withdrawn
- 2000-12-19 US US09/913,154 patent/US20020136186A1/en not_active Abandoned
- 2000-12-19 CN CN00804093A patent/CN1341300A/zh active Pending
- 2000-12-19 AU AU18950/01A patent/AU1895001A/en not_active Abandoned
- 2000-12-19 WO PCT/JP2000/009001 patent/WO2001048951A1/ja not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0613956A (ja) * | 1992-06-29 | 1994-01-21 | Mitsubishi Electric Corp | 移動体通信における送信電力制御装置およびシステム |
| JPH08130535A (ja) * | 1994-11-02 | 1996-05-21 | Nec Corp | 送信ビットレート判別方法及び装置 |
| JPH08149567A (ja) * | 1994-11-16 | 1996-06-07 | Nec Corp | データレート検出器 |
| JPH10145245A (ja) * | 1996-11-11 | 1998-05-29 | Y R P Ido Tsushin Kiban Gijutsu Kenkyusho:Kk | 可変データレート通信装置 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100448300C (zh) * | 2001-09-07 | 2008-12-31 | Lg电子株式会社 | 移动通信系统中可变数据速率模式下调整信号功率的方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010102373A (ko) | 2001-11-15 |
| JP2001186082A (ja) | 2001-07-06 |
| AU1895001A (en) | 2001-07-09 |
| US20020136186A1 (en) | 2002-09-26 |
| CN1341300A (zh) | 2002-03-20 |
| EP1156600A1 (en) | 2001-11-21 |
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