WO2006008820A1 - 基地局および移動機 - Google Patents
基地局および移動機 Download PDFInfo
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- WO2006008820A1 WO2006008820A1 PCT/JP2004/010421 JP2004010421W WO2006008820A1 WO 2006008820 A1 WO2006008820 A1 WO 2006008820A1 JP 2004010421 W JP2004010421 W JP 2004010421W WO 2006008820 A1 WO2006008820 A1 WO 2006008820A1
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- transmission
- transmission data
- base station
- data
- transmission power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
Definitions
- the present invention relates to a base station and a mobile device that employ CDMA as a communication method, and in particular, a base station that realizes transmission power control when there is no transmission data from the mobile device, and the base station
- the present invention relates to an opposing mobile device.
- a conventional CDMA wireless communication system is optimized for a channel that requires real-time communication such as a voice channel.
- HS_PDSCH High Speed Physical Downlink Shared Channel
- RRC Radio Resource Control
- A—DPCH Associated Dedicated Physical Channel
- the transmission slot in the base station includes a data part for transmitting voice and packets, a TPC (transmission power control) for transmitting a transmission power control command as a kind of layer 1 control signal, and a layer 1 control. It is a type of signal and consists of TFCI (Transport Format Combination Indicator) for use in channel coding / decoding and Pilot used for synchronization and demodulation on the receiving side with known sequence data.
- TFCI Transport Format Combination Indicator
- the transmission slot in the mobile station consists of TPC, TFCI, and Pilot. Channels that transmit layer 1 control information such as TPC, TFCI, and Pilot are called DPCCH (Dedicated Physical Control Channel).
- Annex.B B.2 Estimates the quality of the transmitted pilot signal, and if it is below the reference value, sends a transmission power control command that instructs the next transmission power increase, and if it is above the reference value, sends a transmission power control command that instructs the next transmission power decrease.
- the base station also uses the SIR (Signal to Signal) of the Pilot signal transmitted by the mobile station.
- Interference Ratio is measured, and if it is less than the reference value, the next transmission power is instructed, and if it is more than the reference value, a transmission power control command is sent to instruct the next transmission power decrease.
- Non-Patent Document 2 the reference value is referred to as "UL SIR Target", which is the information on the control protocol of the base station controller, or NBAP (Node B Application Part).
- UL SIR Target the information on the control protocol of the base station controller, or NBAP (Node B Application Part).
- NBAP Node B Application Part
- the reference value can be changed by the “OUTER LOOP POWER CONTROL message” in the protocol called rfp; frame protocolj.
- the Release99 channel is known to have a low transmission power in order to reduce unnecessary waves at the beginning of a new communication setting.
- control is performed so that transmission is performed with transmission power selected based on preset channel quality conditions.
- SIR Signal to Interference Ratio
- SNR Signal to Noise Ratio
- SINR Signal to Interference plus Noise Ratio
- received electric field strength is an indicator of propagation environment. Different values are required depending on the case.
- Patent Document 2 For example, as a conventional technique when there is no transmission data, there is a technique described in Patent Document 2 below.
- Patent Document 2 when there is no transmission data, a burst frame including only burst data including pilot symbols and transmission power control symbols is generated, and the transmission interval is set to N times one slot (N is a natural number). This allows DPCC for each slot Instead of transmitting H, it is transmitted once in N slots, and power consumption can be reduced by setting the mobile station's transmit amplifier to FF in slots that are not transmitting DPCCH.
- the repetition processing means for continuously arranging the pilot symbols and the transmission power control symbols respectively transmits the data subjected to repetition processing with lower transmission power than before the processing. Yes.
- the transmission format is changed and the transmission power is reduced by xdB by using a repetition technology that repeatedly transmits the same data.
- Patent Document 1 Japanese Patent Laid-Open No. 2000-91985
- Patent Document 2 Japanese Patent Laid-Open No. 11-41203
- Non-Patent Document 1 TS25.214 “Physical layer procedures (FDD)”
- Non-Patent Document 2 TS25.433 “UTRAN Iub interface NBAP signaling” 9.1.36, 9.1.42
- Non-Patent Document 3 TS25.427 “UTRAN Iub / Iur interface user plane protocol for DCH data streamsj 6.3.3
- the number of transmissions can be reduced by reducing the DPCCH transmission interval to N times one slot, thereby reducing power consumption.
- problems such as the case where unwanted waves adversely affect the hearing aid and the resonance effect on the heart pacemaker become problematic.
- the DPCCH transmission is set to random timing, the problem of unnecessary waves is alleviated, but complicated control such as a synchronization method between the mobile station and the base station is required, and the 3GPP RAN
- HSDPA requires the ability to multiplex multiple channels A— DPCH is always required, and this Release 99 channel is used even when packet user data is used in HSDPA. Since transmission power control is always performed, the power consumption of the mobile device increases, and the number of users that can be used simultaneously is limited.
- the present invention has been made in view of the above, and provides a transmission power control method capable of reducing power consumption without changing the transmission slot format and without turning on and off the power of the transmission power amplifying unit. It is intended to provide.
- the base station employs CDMA as a communication method, and achieves transmission power control when there is no mobile device transmission data.
- Station quality measurement means for measuring channel quality using a known sequence included in the received signal (corresponding to channel quality measurement unit 5 in the embodiment described later), and mobile station transmission after despreading, for example Transmission data presence / absence determination means (corresponding to transmission data presence / absence detection unit 6) for determining the presence / absence of mobile device transmission data based on the received power of the data portion,
- a reference value generating means (corresponding to the reference value generating section 7) for reducing the reference value for generating the power control command by a value corresponding to a variable outer loop adjustment amount according to a predetermined condition, and the reference value generating means Generated
- the reference value is compared with the channel quality, and if the former is large, a transmission power control command is generated to reduce the transmission power of the mobile device. If the former is small, the transmission power control command is generated to increase the
- a function for measuring the channel quality of a transmission signal from a mobile device a function for detecting the presence / absence of transmission data from the mobile device, and a predetermined case when there is no transmission data from the mobile device. And a function for adjusting a reference value for generating a transmission power control command using the outer loop adjustment amount of the signal and a function for generating a transmission power control command based on the line quality and the adjusted reference value. It was.
- FIG. 1 is a diagram showing a configuration example of a first embodiment of a CDMA base station apparatus according to the present invention.
- FIG. 2 is a diagram illustrating an example of processing of a transmission data presence / absence detection unit.
- FIG. 3 is a diagram illustrating an example of processing of a transmission data presence / absence detection unit.
- FIG. 4 is a diagram showing a configuration of a general CDMA demodulation circuit.
- FIG. 5 is a diagram showing a configuration example of a second embodiment of the CDMA base station apparatus according to the present invention.
- FIG. 6 is a diagram showing an example of a transmission frame format.
- FIG. 7 is a diagram showing a configuration example of a second embodiment of a CDMA base station apparatus according to the present invention.
- FIG. 8 is a diagram showing a configuration example of a third embodiment of a CDMA base station apparatus according to the present invention.
- FIG. 9 is a diagram showing an example of a format of information to be responded.
- FIG. 10 is a diagram showing a configuration example of a fourth embodiment of a CDMA base station apparatus according to the present invention.
- FIG. 11 is a diagram illustrating a detailed configuration example of a receiving unit.
- FIG. 13 is a diagram showing a configuration of a synchronization detection unit.
- FIG. 14 is a diagram showing a configuration example of a fourth embodiment of a CDMA base station apparatus according to the present invention.
- FIG. 15 is a diagram showing an output of a matched filter unit of BPSK.
- FIG. 16 is a diagram showing the result of cyclic addition of the signal of FIG. 15 while multiplying the signal of FIG. 15 by a forgetting constant.
- FIG. 17 is a diagram showing the result of cyclic addition of the signal of FIG. 15 while multiplying the signal of FIG. 15 by a forgetting constant.
- FIG. 18 is a diagram showing the output of the matched filter unit to be compared in FIG. 19]
- FIG. 19 is a diagram showing the result of cyclic addition of the signal of FIG. 18 while multiplying the signal of FIG. 18 by the forgetting constant.
- FIG. 20 is a diagram illustrating a result of cyclic addition of the signal of FIG. 18 while multiplying the signal of FIG. 18 by a forgetting constant.
- FIG. 21 is a diagram of a configuration example of the fifth embodiment of the CDMA base station apparatus according to the present invention.
- FIG. 22 is a diagram showing a calculation process of the phase rotation amount per time.
- Fig. 23 is a diagram showing a case where the amount of phase rotation per time is calculated using user data.
- FIG. 24 is a diagram showing a configuration example of a CDMA base station apparatus according to the fifth embodiment of the present invention.
- FIG. 25 is a diagram illustrating a configuration example of the receiving unit.
- FIG. 26 is a diagram showing a configuration example of the sixth embodiment of the CDMA base station apparatus according to the present invention.
- FIG. 27 is a diagram showing the transmission power of the opposite station when there is no transmission data.
- FIG. 28 is a diagram showing a configuration example of the seventh embodiment of the CDMA base station apparatus according to the present invention.
- FIG. 29 is a diagram showing a configuration example of the eighth embodiment of the CDMA base station apparatus according to the present invention.
- FIG. 30 is a diagram showing processing until the output of the transmission power control command generation unit becomes stable.
- FIG. 31 is a diagram showing a configuration example of the eighth embodiment of the CDMA base station apparatus according to the present invention.
- FIG. 32 is a diagram of a configuration example of the ninth embodiment of the CDMA base station apparatus according to the present invention.
- FIG. 33 is a diagram illustrating a configuration example of the CDMA base station apparatus according to the tenth embodiment of the present invention.
- FIG. 34 shows an example of the configuration of the eleventh embodiment of the CDMA mobile device which is effective in the present invention. It is a figure.
- FIG. 35 is a diagram showing the configuration of the twelfth embodiment of a CDMA mobile device that is useful for the present invention.
- FIG. 36 is a diagram showing a case where hysteresis is added to the determination processing of the line quality determination unit.
- FIG. 37 is a diagram showing a configuration example of the thirteenth embodiment of the CDMA mobile device according to the present invention.
- FIG. 38 is a diagram showing a configuration example of a CDMA mobile device according to the fourteenth embodiment, which focuses on the present invention.
- FIG. 39 is a diagram showing a configuration example of a CDMA mobile device according to the fourteenth embodiment, which focuses on the present invention.
- FIG. 40 is a diagram illustrating a configuration example of a CDMA mobile station device according to Embodiment 15 which focuses on the present invention.
- FIG. 41 is a diagram showing a configuration example of a CDMA mobile device according to Embodiment 16 that is useful in the present invention.
- FIG. 42 is a diagram showing a configuration example of a CDMA mobile device according to the seventeenth embodiment that is useful in the present invention.
- FIG. 1 is a diagram showing a configuration example of a first embodiment of a CDMA base station apparatus according to the present invention, which includes a receiving unit 1, a transmitting unit 2, a channel coding / decoding processing unit 3, and an upper layer process.
- a unit 4 a line quality measurement unit 5, a transmission data presence / absence detection unit 6, a reference value generation unit 7, and a transmission power control command generation unit 8 are provided.
- the channel coding / decoding processing unit 3 performs channel coding such as error correction coding on the data output from the higher layer processing unit 4, and the transmission unit 2 performs spreading. Send a later signal.
- the receiving unit 1 receives a signal transmitted from the opposite station and outputs a signal after despreading, and the channel coding / decoding processing unit 3 performs channel decoding such as error correction decoding. Then, the decoded data is transferred to the upper layer processing unit 4.
- the CDMA base station apparatus includes a channel quality measurement unit 5, and the channel quality measurement unit 5 measures reception quality using the D PCCH. For example, using a pilot signal that is a known sequence in the DPCCH, a method for obtaining SINR as shown in the following equation (1) using the dispersion from the ideal phase point as the interference component and the amplitude as the signal component is known. ing. [0026] [Equation 1]
- r is a received pilot signal after despreading, and is a beta value because multi-level modulation is assumed.
- P is a known pilot phase
- N is the number of pilot symbols when calculating the average over the period of transmitting the transmission power command (the basic unit when transmitting by multilevel modulation is defined as one symbol). If the thermal noise is negligible, the SIR can be calculated by the above calculation.
- the received signal quality can be expressed by the received electric field strength and SNR. For systems where interference is known not to change abruptly, it is effective to average a larger value than N sample for interference.
- the transmission data presence / absence detection unit 6 when there is no transmission data in the mobile station, the amplitude of the data component becomes 0. Therefore, the mobile station transmission data after despreading and the layer 1 known sequence signal or layer 1 The presence / absence of mobile station transmission data is determined from the two inputs, signaling information. Specifically, as shown in equation (2), the decision is made based on whether or not the ratio between the despread mobile station transmission data and the pilot signal exceeds a certain threshold, value # 1.
- the transmission data reception power and the pilot signal reception power are integrated over a specific period, and whether the ratio of the integration results exceeds a specific threshold # 2 or not.
- the reliability is improved, and it is less likely to be affected by instantaneous fluctuations in the transmission path.
- the threshold value has been continuously exceeded for a specific number of times. It is also possible to determine the presence or absence of transmission data by deciding whether or not the threshold is exceeded at a certain rate or higher.
- the transmission data presence / absence detection unit 6 preferably performs the following processing.
- QoS quality of service
- Threshold values # 1, # 2) are determined (first method). This method is effective for traffic such as Internet access, and can reduce the transmission power of the mobile device while there is no traffic for a long time.
- the transmission power cannot be controlled for each QoS.
- the most stringent channel QoS is the multi-channel QoS.
- the QoS of the channel with the smallest allowable delay time, the QoS with the lowest allowable error rate, the QoS of the channel, and the QoS of the channel other than the packet when the packet channel and other channels are multiplexed are multiplexed.
- FIG. 2 is a diagram showing a fourth method in the transmission data presence / absence detection unit 6 and shows a case where hysteresis is applied to the determination of the presence / absence of transmission data according to the above equation (2).
- “mobile station transmission data reception power / Pilot signal reception power” is represented by a line.
- FIG. 3 is a diagram illustrating a fifth method in the transmission data presence / absence detection unit 6. Here, it can be seen that it is easy to determine that there is transmission data.
- the reference value generation unit 7 In order to generate a transmission power control command, the reference value generation unit 7 generates an initial value of the radio channel quality corresponding to the required quality of data transmitted by the opposite station as a reference value.
- the reference value generation unit 7 when the determination result by the transmission data presence / absence detection unit 6 is that there is no transmission data, the reference value is lowered by a predetermined value set according to the transmission path condition or the like. This value is defined as outer loop adjustment amount # 1.
- the outer loop adjustment amount # 1 is set stepwise according to, for example, the transmission path condition.
- a pilot signal whose transmission power is low due to adjustment of outer loop adjustment amount # 1 is set to a value that is too low for the power to demodulate.
- FIG. 4 is a diagram showing a configuration of a general CDMA demodulation circuit, and shows a detailed configuration of a portion corresponding to the receiving unit in FIG.
- the signal received by the analog unit 11 is AZD converted by the A / D 12 and transferred to the matched filter unit 13.
- the output signal of the matched filter unit 13 is input to the search unit 15 where it is used for path detection.
- Search section 15 performs cyclic integration to improve SN.
- the path position depends on the distance between the mobile station and the base station. The degree is extremely fast. For example, if the path position fluctuates by 0.5 chips at a chip rate of 3.84 Mcps, it means that the mobile device has moved by the following formula (5).
- the RAKE receiver 14 performs demodulation processing based on the phase information of the pilot signal that fluctuates during a sudden phase change, if the pilot information at that moment becomes uncertain, the reception performance is improved.
- Pilot signal transmission period is 666 microseconds in the 3GPP-FDD standard, which is very short compared to 100 ms).
- the probability of Pilot information is proportional to the received power of the pilot signal. From the above, it can be seen that the received power required to secure the path position by path detection capable of integration is lower than the pilot received power that requires instantaneous phase information.
- the transmission power control command generation unit 8 compares the reference value received from the reference value generation unit 7 with the line quality notified from the line quality measurement unit 5 and determines that the former is large. A transmission power control command for reducing the transmission power of the opposite station is generated, and when the former is small, a transmission power control command for increasing the transmission power of the opposite station is generated. Then, the transmission unit 2 transmits a transmission power control command to the opposite station together with the transmission data.
- the function of measuring the line quality of the transmission signal of the opposite station the function of detecting the presence / absence of transmission data from the opposite station, and the transmission data from the opposite station If there is not, there is a function to adjust the reference value for generating a transmission power control command using a predetermined outer loop adjustment amount, the line quality and the adjusted reference And a function of generating a transmission power control command based on the value.
- This enables transmission power control that reduces power consumption as a whole device without changing the transmission slot format and without turning on / off the power of the transmission power amplifier.
- FIG. 5 is a diagram showing a configuration example of the CDMA base station apparatus according to the second embodiment of the present invention.
- a transmission data presence / absence message extraction unit 21 and a transmission data presence / absence message are shown.
- a detection unit 22 is shown. Note that the same components as those in FIG. 1 of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. Here, processing different from that of the first embodiment will be described.
- Transmission data presence / absence message extraction unit 21 extracts the presence / absence of transmission data from the layer 1 signaling information.
- FIG. 6 is a diagram illustrating an example of a transmission frame format.
- Data # 1 and Data # 2 are data portions for transmitting voice and packets.
- TPC is a type of layer 1 control signal and transmits a transmission power control command.
- TF is a type of layer 1 control signal called TFCI in the 3GPP-F DD standard, and is used for channel coding and decoding.
- Pilot is a type of layer 1 control signal and is used for synchronization processing and demodulation on the receiving side with known series of data.
- the transmission data presence / absence message extraction unit 21 extracts the bit labeled E (hereinafter referred to as E bit) received together with the layer 1 control signal in FIG. Is output.
- E bit indicates the presence or absence of transmission data, or may be a notice of data to be transmitted soon.
- the transmission data presence / absence message detector 22 performs error correction decoding when error correction coding is performed in channel coding units (units called TTI (Transmission Time Interval) or frames in 3GPP—WCDMA—FDD).
- TTI Transmission Time Interval
- WCDMA Wireless Fidelity
- the result is output to the reference value generation unit 7. For example, if the E bit in FIG. 6 is 1, it is determined that there is transmission data, and if it is 0, there is no transmission data, and the result is output to the reference value generation unit 7.
- the hysteresis of transmission data presence / absence determination in this embodiment is based on the sign of E bit. This is effective when it has not For example, the transmission data presence / absence message detection unit 22 determines that there is no transmission data when it is determined that there is no continuous transmission data three times, and determines that there is transmission data based on a single determination when there is transmission data.
- QoS is effective when the E bit is not encoded.
- the QoS of the strictest channel is multiplexed if the transmission power cannot be controlled for each QoS.
- Channel QoS the QoS with the smallest allowable delay time, the QoS with the lowest allowable error rate, and the QoS of the channel other than the packet when the packet channel and other channels are multiplexed.
- FIG. 7 is a diagram showing a configuration of the CDMA base station apparatus when the transmission data presence / absence message E is included in the data not included in the layer 1 control signal. Characteristic operations (processing of the transmission data presence / absence message extraction unit 21 and the transmission data presence / absence message detection unit 22) are the same as described above.
- the function of measuring the channel quality of the transmission signal of the opposite station the function of detecting the presence or absence of transmission data from the opposite station, A function of adjusting a reference value for generating a transmission power control command when there is no transmission data from the opposite station, a function of generating a transmission power control command based on the line quality and the adjusted reference value, It was decided to prepare.
- transmission power control can be performed so as to reduce power consumption without changing the transmission slot format and without turning on / off the power of the transmission power amplifier.
- FIG. 8 is a diagram illustrating a configuration example of the third embodiment of the CDMA base station apparatus that is useful for the present invention, and includes a transmission data presence / absence detection response generation unit 23 in addition to the configuration of the first embodiment described above. ing. Note that the same components as those in FIG. 1 of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. Here, processing different from the first embodiment will be described.
- the transmission data presence / absence detection response generation unit 23 that has received the determination result of the presence / absence of transmission data returns, for example, a response indicating that there is transmission data when the determination result is the presence of transmission data. If the result is no transmission data, a response indicating that there is no transmission data is returned.
- FIG. 9 is a diagram showing an example of the format of the response information.
- the presence / absence of transmission data based on the determination of the reception slot is transmitted at the location indicated by R (hereinafter referred to as the R bit) shown in Fig. 9. For example, “11” is set when there is data, and “00” is set otherwise.
- the mobile device can confirm that the base station has determined that there is transmission data, and can start data transmission. Therefore, when the mobile station resumes transmission, it is possible to perform efficient transmission without waste such as loss of the data head.
- the processing by transmission data presence / absence detection response generation unit 23 is applied to the configuration of the first embodiment.
- the present invention is not limited to this, and is applied to the configuration of the second embodiment. Is also positive.
- FIG. 10 is a diagram illustrating a configuration example of the fourth embodiment of the CDMA base station apparatus that is useful for the present invention.
- the synchronization detection unit 24 is provided and the reference value generation is performed.
- the unit 7a generates a reference value for generating a transmission power control command based on the determination result of the presence / absence of transmission data and the output of the synchronization detection unit 24. Note that the same components as those in FIG. 1 of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. Here, processing different from that of the first embodiment will be described.
- FIG. 11 is a diagram showing a detailed configuration example of the receiving unit 1, and the operation outline is the same as FIG.
- the operation of the receiving unit 1 will be described in detail.
- the search unit 15 first stores the first-cycle delay profile in the memory 32.
- the forgetting constant multiplying unit 33 multiplies the stored delay profile by the forgetting constant, and the adding unit 31 adds the multiplication result to the delay profile of the second round.
- the above operation is repeated for the third, fourth, ... delay profiles (cyclic addition).
- the determination unit 34 compares the result of the cyclic addition described above with a threshold value defined corresponding to the SIR, SINR, or SN of the assumed received signal, and detects a path. If multiple paths are detected, it means that each path through the multipath transmission path has reached the receiver 1.
- the RAKE receiver 14 adds the output signals of the matched filter 13 corresponding to the detected arrival time of the paths in phase, and adds a known sequence such as DPCCH or layer 1 signaling information as a result of the addition.
- the user data is output to the channel coding Z decoding unit 3 and the transmission data presence / absence detection unit 6.
- the first and third round waveforms show an output example of the matched filter 13 that is BPSK (Binary Phased Shift Keying) modulated. It is difficult to predict the arrival time difference of incoming waves due to multipaths only with the output of the matched filter 13, but it can be seen that by integrating, the correlation value increases and two paths can be seen. If the cyclically added value is equal to or greater than a specific threshold, it is determined that there is a path.
- BPSK Binary Phased Shift Keying
- the search unit in the case of performing forgetting constant multiplication has been described with reference to FIGS. 11 and 12, the present invention is not limited to this.
- a moving average of a specific number of times may be taken in cyclic addition.
- the phase will rotate if added for a long time, so it may be possible to add squares at specific times and add them cyclically.
- the threshold value is set according to the values of the force reception SIR, SINR, and SN that differ depending on the above processing.
- the synchronization detector 24 uses the correlation information of the matched filter output to perform synchronization detection processing (processing for detecting whether or not synchronization of the local station is ensured) (first example).
- the synchronization detector 24 The definition of “synchronization” does not have to be the same as the definition of synchronization in a wireless communication system.
- FIG. 13 is a diagram showing the configuration of the synchronization detection unit 24, which is the same as the search unit 15.
- the path detection level required for RAKE reception and the path detection level required for the synchronization detection unit 24 are generally different. For example, it is only necessary to know the approximate path position.
- the path detection of the synchronization detection unit 24 is different from the path detection of the search unit 15 in which the demodulation characteristics such as the error rate of information deteriorate if instantaneous path detection is mistaken.
- the threshold value can be relatively lowered. It is also effective to make the forgetting constant of the synchronization detecting unit 24 smaller (harder to forget) than the search unit 15 as well as to lower the threshold for path detection.
- the search unit 15 performs the cyclic addition shown in FIG.
- the synchronization detector 24 performs integration for a longer time, so it is possible to add the value after squaring every round.
- the search unit 15 also uses the method of cyclic addition using user data (since 0 and 1 of the user data are unknown, the square is added every round), the synchronization detection unit is also used. In 24, the purpose is to ensure synchronization when there is no user data, so it is possible to accurately determine without using user data without using user data.
- the synchronization detection unit 24 may perform the synchronization detection process by a process different from the first example of the synchronization detection process (second example).
- FIG. 14 is a diagram illustrating a configuration example of the fourth embodiment of the CDMA base station apparatus according to the present invention.
- the synchronization detection unit 24a includes a known system IJ (synchronization word or preamble) of layer 1 Layer 1 signaling information (3GPP WCDMA—corresponds to TFC I and TPC in FDD).
- the synchronization detection unit 10 counts how many bits of a known sequence of Layer 1 whose sequence of data 0 and 1 is known in advance is incorrect, and compares it with a threshold value.
- a method of cyclic addition while applying a forgetting constant or a method of taking a moving average is effective.
- Another effective method is to determine the synchronization by counting the rate at which Layer 1 signaling information falls outside the expected range. For example, according to 3GPP WCDMA—FDD “TS25.212V3.12.
- TFCI before encoding is lObit up to 0 1023 It can be taken, but if the set communication is only defined as 0, 1, 2 and 3, it is determined to be synchronized if it is within a certain ratio except for 0, 1, 2 and 3.
- TPC the data that means “raise” is “00”, and the data that means “lower” is “11”. “01” and “10” are impossible cases, and if this impossible case is within a certain ratio, it is determined to be synchronized.
- the reference value generator 7a The reference value for generating the transmission power control command is gradually reduced. On the other hand, if it indicates “out of synchronization” and there is no transmission data from the mobile device, the reference value is gradually increased. Also, when the forgetting constant for cyclic addition is large (forgetting is fast), the speed for reducing the reference value is increased, and when the forgetting constant for cyclic addition is small (forgetting is slow), the speed for reducing the reference value is slowed. To do.
- FIG. 15 is a diagram illustrating an output of the matched filter unit 13 of BPSK.
- the synchronization detector 24 or 24a is in the “synchronized” state, and the reference value is reduced by ldB for each cycle, and the mobile station's transmission power is reduced by ldB accordingly. Yes. Since the mobile device is far away, it can be seen that the path detection position is increased by one sampnore time per round.
- FIGS. 16 and 17 are diagrams showing the result of cyclic addition of the signal of FIG. 15 by the synchronization detection unit 24 or 24a while multiplying the signal with the forgetting constant.
- the forgetting constant when the synchronization detector 24 or 24a performs cyclic addition also has the same cycle is shown.
- the forgetting constant is shown as an example when the forgetting speed is fast 0.75 (multiplier 0.25), and in Fig. 17, the forgetting speed is slow 0.125 (multiplier 0.875) as an example. Yes.
- FIG. 18 is a diagram illustrating an output of the matched filter unit 13 to be compared with FIG.
- the reference value is reduced by 0.25 dB for each cycle, and the transmission power of the mobile device is incremented by 0.25 dB accordingly. It shows the case of going down. Because the mobile device is far away, the path detection position power ⁇ It can be seen that the time for one sumnore is getting longer.
- FIG. 19 and FIG. 20 are diagrams showing the results of cyclic addition of the signal of FIG. 18 by multiplying the forgetting constant by the synchronization detection unit 24 or 24a.
- the forgetting constant when the synchronization detecting unit 24 or 24a performs cyclic addition also shows a case where the forgetting constant has the same cycle.
- FIG. 19 shows an example where the forgetting constant is 0.75 (multiplier 0.25)
- FIG. 20 shows an example where the forgetting constant is 0.125 (multiplier 0.875).
- the amount of change in the reference value is small, so it can be seen that the path can be detected as the timing of the neighborhood and can be followed.
- the reference value is adjusted based on the synchronization detection result by the processing of the synchronization detection unit. Thereby, an optimum reference value for generating a transmission power control command can be set.
- FIG. 21 is a diagram showing a configuration example of a CDMA base station apparatus according to the present invention according to the fifth embodiment.
- a movement speed detection unit 41 is provided and synchronization detection is performed.
- the unit 24b performs synchronization detection processing based on the output of the receiving unit 1 and the output of the moving speed detection unit 41.
- the movement speed detection unit 41 detects the movement speed from the known sequence information of layer 1 or the signaling information of layer 1 and the synchronization detection unit 24b synchronizes with the output result of the movement speed detection unit 41.
- the processing for adjusting the detection judgment is different from that of the fourth embodiment described above. Note that the same components as those in FIGS. 10 and 14 of the fourth embodiment described above are denoted by the same reference numerals and description thereof is omitted. Here, processing different from the fourth embodiment will be described.
- the wavelength is shortened accordingly, so the base station offsets the received frequency by the Doppler frequency as shown in the following equation (6).
- FIG. 22 is a diagram showing a process for calculating the amount of phase rotation per time.
- the amount of phase rotation per time can be calculated, and the moving speed can be estimated.
- it is also effective to perform the moving speed estimation process with user data using the characteristics of the modulation scheme without using a known sequence. For example, when QPSK modulation is performed, the data after despreading is at four specific locations, and can be expressed as shown in Fig. 23 if the sign bit is replaced positively.
- FIG. 22 is a diagram showing a process for calculating the amount of phase rotation per time.
- FIG. 23 is a diagram illustrating a case where the amount of phase rotation per hour is calculated using user data. Therefore, as with the known sequence of layer 1, if user data is accumulated several times in succession, the amount of phase rotation per time can be calculated and the moving speed can be estimated.
- the movement speed detection unit may perform the movement speed detection process by a process different from the first example of the movement speed detection process (second example).
- FIG. 24 is a diagram illustrating a configuration example of the fifth embodiment of the CD MA base station apparatus that is useful for the present invention.
- FIG. 25 is a diagram illustrating a configuration example of the reception unit 1.
- the moving speed detection unit may calculate the moving speed using GPS (Global Positioning System).
- GPS Global Positioning System
- a mobile device is equipped with GPS, and the mobile device sends location information as a message to the base station. Then, the base station or the host device calculates the moving speed of the mobile device from the position change speed and outputs it to the synchronization detecting unit 24b.
- the mobile device may calculate the moving speed and send the calculation result to the base station in a message.
- sync detector 24b input For example, if the speed is faster than a predetermined speed, the forgetting constant of the synchronization detector 24b is increased (easily forgotten), and if it is slower than the specified speed, the forgetting constant is decreased. Do (hard to forget). As a result, it is possible to accurately detect the path even if the transmission power of the mobile device is lowered, to realize synchronization detection optimized for the moving speed, and to generate an optimal transmission power control command.
- the parameter for moving average is reduced (easily forgotten), and the speed is higher than the specified speed. If it is late, increase the parameter (hard to forget). As a result, it is possible to obtain the same effect as when the forgetting constant is adjusted.
- FIG. 17 described above is used in the embodiment 4 as an example when the forgetting constant is too small. However, if the view is changed, the moving speed is higher than the specific forgetting constant (0.125). It can be seen that the path detection is wrong because it is too fast.
- FIG. 26 is a diagram showing a configuration example of the sixth embodiment of the CDMA base station apparatus that is effective in the present invention.
- the local station transmission power control command extraction unit 42 and The transmission power control unit 43, and the local station transmission power control command extraction unit 42 extracts the transmission power control command of the local station from the layer 1 signaling information, and the transmission power control unit 43 Determine the transmission power.
- the same components as those in FIG. 1 of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.
- processing different from that of the first embodiment will be described.
- transmission power control section 43 determines the transmission power based on the command extracted by own station transmission power control command extraction section 42. This will be described in detail.
- the transmission power control unit 43 reduces the transmission power from the opposite station. Therefore, in order to improve the accuracy, the transmission power control is performed n (an integer of 2 or more) times. Control transmission power once with a command.
- the transmission power control unit 43 takes an average of n transmission power control commands of the local station extracted from the layer 1 signaling information, and the averaged result is a predetermined threshold value. If this is the case, increase the transmission power of the opposite station by the specified transmission power value. When the value is equal to or lower than the threshold value, the transmission power of the opposite station is decreased by a predetermined transmission power value. It is also possible to perform threshold judgment by taking the average of n times using the extracted transmission power control command SIR, SNR, SINR, or received field strength as reliability information. In particular, when the opposite station is limited to indoor operation or low-speed movement, it is effective to increase n because rapid transmission power control is not required.
- FIG. 27 is a diagram showing the transmission power of the opposite station when there is no transmission data. In this case, it is desirable that the transmission power control command transmitted by the opposite station is sent at least n times continuously in the same message.
- the base station can achieve transmission power control even if the layer 1 transmission format from the opposite station is the same as the conventional one, for example, without knowing the change timing of pilot reception and TPC reception. Demodulation processing can be performed.
- FIG. 28 is a diagram showing a configuration example of the seventh embodiment of the CDMA base station apparatus that is effective in the present invention.
- a self-station transmission data presence / absence detection unit 44 is provided.
- the reference value generation unit 7b generates a reference value for generating a transmission power control command based on the output of the transmission data presence / absence detection unit 6 and the output of the local station transmission data presence / absence detection unit 44.
- Note that the same components as those in FIG. 1 of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. Here, processing different from that of the first embodiment will be described.
- the reference value generation unit 7b of the present embodiment has no transmission data from the opposite station and there is no transmission data from the own station to the opposite station (communication from the own station to other than the opposite station). Presence or absence The outer loop adjustment amount # 1 is valid. That is, when there is no transmission data from the opposite station and there is no transmission data of the own station, the reference value is decreased by a value corresponding to the outer loop adjustment amount # 1, and then the presence of transmission data of the own station is detected. In this case, increase the reference value by a value corresponding to outer loop adjustment amount # 1.
- the local station transmission data presence / absence detection unit 44 has reached a certain time (non-transmission determination threshold) for a continuous time without transmission data (non-transmission continuous time). In this case, it is determined that there is no transmission data of the local station. If any transmission data occurs within the specified time, it is determined that there is transmission data of the own station. This avoids misjudgment.
- the non-transmission determination threshold value depends on the content of user data being transmitted and received. For example, the no-transmission determination threshold is determined according to the allowable delay time corresponding to the QoS of the local station transmission data, the allowable error rate, or both. In addition, when the transmission data in the radio section is data in which multiple QoSs are multiplexed, for example, the maximum value of the non-transmission judgment threshold corresponding to the allowable delay time corresponding to QoS, the allowable error rate, or both Is determined as a value for determining whether there is no transmission of multiplexed data.
- the local station transmission data presence / absence detection unit 44 is the next transmission data when the transmission data is data in which a plurality of QoS is multiplexed and the transmission data is generated without the local station transmission data.
- the next non-transmission judgment threshold is used. As a result, erroneous determination can be avoided even when the next transmission data is generated.
- the local station transmission data presence / absence detection unit 44 can also perform the following processing.
- the local transmission data presence / absence detection unit 14 outputs a determination signal indicating no transmission data to the reference value generation unit 7. If the non-transmission determination threshold value obtained for each data is the multiple channel non-transmission determination threshold value, the opportunity to output a determination signal indicating no transmission data to the reference value generator 7 is reduced, and the transmission power is reduced. Reduction of the amount is not promoted.
- the local station transmission data presence / absence detection unit 14 identifies the radio control channel power ⁇ packet data power when transmission data is generated in the local station, for example, the radio control channel If this is the case, the current non-transmission judgment threshold is further reduced after data transmission. As a result, there are more opportunities to determine that there is no transmission, and thus the transmission power of the mobile device can be further reduced.
- FIG. 29 is a diagram illustrating a configuration example of the eighth embodiment of the CDMA base station apparatus according to the present invention.
- the transmission timing control unit 45 for controlling the transmission timing is provided. Note that the same reference numerals are given to the same configurations as those in Embodiments 6 and 7, and the description thereof is omitted. Here, the processing different from Embodiments 6 and 7 will be described.
- the transmission power control command generation unit 8 when there is no mobile device transmission data and the transmission power from the opposite station is reduced by the processing of the transmission power control command generation unit 8, if the transmission power is too low, the base station The transmission power control command from the opposite station cannot be received correctly, and transmission power control from the local station to the opposite station may become unstable. In such a case, for example If the detection result of the local station transmission data presence / absence detection unit 44 changes from “No transmission data” to “Transmission data present” and immediately transmits the local transmission data, the downlink transmission power is too low and the head of the data is There is a possibility that it will not be possible to receive data on the network, or that the transmission power will be excessive and interference with other devices will increase.
- transmission timing control unit 45 when transmission timing control unit 45 is notified of transmission data resumption from local station transmission data presence / absence detection unit 44, output from transmission power control command generation unit 8 The transmission timing is controlled so as to wait for the transmission to stabilize.
- “stable” means, for example, the case where the accumulated difference of 15 transmission power controls is within ⁇ 3 dB.
- FIG. 30 is a diagram showing processing until the output of the transmission power control command generation unit 8 becomes stable.
- FIG. 31 is a diagram showing another configuration example of the eighth embodiment of the CDMA base station apparatus useful for the present invention.
- the ability to determine whether the transmission power of the local station is stable is not limited to this.
- transmission power control is performed at high speed, such as 3GPP WCDMA—FDD
- FIG. 31 it is possible to determine whether or not the transmission power of the own station is stable by using the channel quality from the opposite station. As a result, the same effect as described above can be obtained. The reason is that if the line quality from the opposite station is sufficient, the transmission power control command from the opposite station can be correctly received.
- the transmission timing control unit 45 uses the layer 1 known sequence or the layer 1 signaling information to determine the line quality (SIR, SNR, SINR, or received electric field strength). taking measurement. Specifically, the dispersion of channel quality (the square of the distance from the average of the population) is measured to detect that it falls within a specific threshold.
- line quality SIR, SNR, SINR, or received electric field strength
- FIG. 32 is a diagram illustrating a configuration example of the CDMA base station apparatus according to the ninth embodiment of the present invention.
- local station transmission data presence / absence detection unit 44 according to the seventh embodiment.
- the transmission timing control unit 45a controls the transmission timing of the local station transmission data based only on the output of the local station transmission data presence / absence detection unit 44.
- the same components as those in the above-described eighth embodiment are denoted by the same reference numerals and description thereof is omitted. Here, processing different from that in Embodiment 8 will be described.
- the transmission timing control unit 45a when the transmission timing control unit 45a is notified of transmission data resumption from the local station transmission data presence / absence detection unit 44, for example, a delay of a predetermined fixed time is added.
- This fixed time corresponds to the time to wait for the local station transmission power to stabilize in the eighth embodiment.
- simulation is performed in advance and a fixed value with a margin is provided. And as a result, the same effects as those of the eighth embodiment described above can be obtained with a simple configuration.
- the fixed time delay may be added in addition to when transmission data is resumed.
- the fixed time may be controlled according to the magnitude of outer loop adjustment amount # 1. For example, if the outer loop adjustment amount # 1 is large, the fixed time is increased because it takes time S to stabilize the local station transmission power.
- the transmission timing control unit 45a permits the user data being transmitted regardless of the predetermined fixed time or the time corresponding to the magnitude of the above-described data loop adjustment amount # 1. Depending on the delay time, data transmission may be started before the local station transmission power stabilizes. In addition, in the method for controlling the predetermined fixed time or the time corresponding to the magnitude of the outer loop adjustment amount # 1, for example, more carefully according to the allowable error rate of user data being transmitted. It is also possible to start transmission after waiting for the local station transmission power to stabilize.
- FIG. 33 is a diagram showing a configuration example of the CDMA base station apparatus according to the tenth embodiment of the present invention.
- an error rate measuring unit 47, a reference value generating unit, 48 and a reference value combining unit 46, and the transmission power control command generating unit 8 generates a transmission power control command using the reference value output from the reference value combining unit 46.
- the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. .
- processing different from that of the first embodiment will be described.
- the error rate measurement unit 47 for example, counts the result of CRC (Cyclic Redundancy Check code) check by the channel coding / decoding processing unit 3, and obtains BLER (Block Error Rate) or FER (Frame Error Rate). Measure the error rate called.
- BLER Block Error Rate
- FER Frame Error Rate
- the error rate measuring unit 47 may measure the error rate by the following processing different from the above. For example, the error rate measurement unit 47 re-encodes the data after error correction decoding by the same process as the error correction encoding process at the opposite station, compares the result with the code before the error correction, and corrects the error. Count the number of bits that have been In 3GPP WCDMA-FDD, it is defined by TrCH-BER (Transport Channel BER) and the other expression (see Eq. (8)).
- TrCH-BER Transport Channel BER
- Re-encoding BER Number of error correction bits Z Number of data before error correction (8)
- the reference value generation unit 48 performs a so-called conventional outer loop. That is, the error rate targeted by the user data is compared with the output of the error rate measurement unit 47. If the allowable error rate is smaller, the reference value for generating the transmission power control command is lowered, and the allowable error rate is reduced. If the value is larger, the reference value is increased and the transmission power of the opposite station is increased.
- the adjustment amount of the reference value by the above processing is called outer loop adjustment amount # 2.
- the reference value synthesis unit 46 generates an actual reference value for generating a transmission power control command based on the output of the reference value generation unit 7 and the output of the quasi-value generation unit 48.
- the simplest example of the reference value synthesis unit 46 is a method of simply adding the adjustment amount as shown in the following equation (9).
- the outer loop adjustment amount # 1 is valid only when the transmission data presence / absence detection unit 6 determines that there is no mobile device transmission data (the outer loop adjustment amount 2 is the presence or absence of the opposite station transmission data). Does not depend on).
- the transmission power control command generation unit 8 compares the reference value received from the reference value synthesis unit 46 with the channel quality notified from the channel quality measurement unit 5, and when the former is large, the transmission power of the opposite station A transmission power control command for lowering the transmission power is generated. When the former is small, a transmission power control command for increasing the transmission power of the opposite station is generated. Then, the transmission unit 2 transmits a transmission power control command together with the transmission data to the opposite station.
- Embodiment 1 in addition to the function of Embodiment 1, a function for measuring the error rate of the user data and a transmission power control command based on the error rate are provided.
- a reference value generated by the process of the first embodiment when no mobile station transmission data is present
- the reference value generated by the process of the present embodiment It was decided to synthesize. As a result, the same effects as in the first embodiment can be obtained, and more stable transmission power control can be performed.
- FIG. 34 is a diagram illustrating a configuration example of a CDMA mobile device according to the eleventh embodiment, which is effective for the present invention, and is a device facing the CDMA base station device according to any of the first to tenth embodiments described above.
- channel coding / decoding processing section 53 performs channel coding such as error correction coding on the data output from higher layer processing section 54, and transmission section 52 performs spreading. Send a later signal.
- the receiving unit 51 receives a signal sent from the opposite station and outputs a signal after despreading, and the channel coding / decoding processing unit 53 performs channel decoding such as error correction decoding.
- the decoded data is transferred to the upper layer processing unit 54.
- the CDMA mobile device includes a transmission power control command extraction unit 56, and extracts a transmission power control command from the layer 1 signaling information.
- the transmission power control unit 57 controls the transmission power in the transmission unit 52 based on the extracted transmission power control command.
- transmission data presence / absence detection unit 55 inputs the transmission data presence / absence of its own device to channel coding / decoding processing unit 53.
- CRCNG CRC check result is NG Is transmitted.
- significant data is not sent until a sufficient time that allows the base station to determine that there is mobile device transmission data has passed within the range that satisfies QoS. This greatly reduces the probability that the base station will miss data from the mobile device.
- the transmission data presence / absence detecting unit 55 is not limited to the power used for the presence / absence determination using the output of the channel coding / decoding processing unit 53. Alternatively, it is possible to determine that the transmission data of the own station is present immediately after the data of the higher-level device arrives. In this case, the delay when resuming transmission can be reduced.
- the channel coding / decoding processing unit 53 uses an invalid header in layer 2 instead of the CRCNG data. It is also possible to use data that can be used as data, or data that cannot be assembled (dummy data). This is a CRCNG data as described above. This is particularly effective when there is a possibility of erroneous control of the outer loop at the base station.
- FIG. 35 is a diagram illustrating a configuration example of the twelfth embodiment of the CDMA mobile device according to the present invention.
- the reception channel quality with the base station is further increased.
- a channel quality measuring unit 58 for measuring and a channel quality determining unit 59 for determining whether the measured channel quality is good or not, and the channel coding / decoding processing unit 53a performs processing considering the quality of the line quality. ing. Note that the same components as those in FIG. 34 of the eleventh embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. Here, the processing different from that of Embodiment 11 will be described.
- the channel quality measurement unit 58 measures the received field strength or SNR as the received channel quality if the communication system is known to be, for example, SIR, SINR, or a single user.
- the channel quality judgment unit 59 compares the integrated value of the channel quality measurement results or the average value of the measurement results of a plurality of times with a threshold value described in advance, and sets it below the threshold value. Output whether or not. Alternatively, it outputs whether or not the line quality measurement result has fallen below a predetermined threshold value continuously several times.
- the line quality determination unit 59 can also provide hysteresis to the determination result.
- hysteresis is added to the determination result, unnecessary processing can be reduced when the channel quality of the transmission data of the base station continues to change in a short time according to the propagation environment.
- FIG. 36 is a diagram illustrating a case where hysteresis is provided in the determination processing of the line quality determination unit 59. By providing hysteresis, the number of times of switching between abnormal and normal can be reduced.
- the determination process having the above hysteresis is performed when the outer loop adjustment amount # 1 is enabled in the base station (when the uplink transmission power is reduced) and the transmission data power from the base station
- CPICH Common Pilot Channel
- Channel coding / decoding processing section 53a transmits CRCNG data when there is no transmission data in the mobile station and when the channel quality judgment result is equal to or less than a threshold value. That is, in this embodiment as well, as described above, significant data is not sent until a sufficient time that allows the base station to determine that there is mobile device transmission data passes within a range that satisfies QoS. This greatly reduces the probability that the base station will miss data from the mobile device.
- the transmission data presence / absence detection unit 55 uses the output of the channel coding / decoding processing unit 53a to determine presence / absence, but not limited to this, the data from the upper layer is not limited thereto. It may be determined that the transmission data of the local station is present immediately after the occurrence or immediately after the arrival of data from the host device. In this case, the delay when resuming transmission can be reduced. In addition, when a change from “no transmission data” to “transmission data present” is detected, the channel coding / decoding processing unit 53a replaces the CRCNG data with data that causes a header error in layer 2. It is also possible to use force that can be used, or data that cannot be assembled (dummy data). This is particularly effective when the data that becomes CRCNG as described above may cause erroneous control of the outer loop at the base station.
- FIG. 37 is a diagram illustrating a configuration example of the CDMA mobile device according to the thirteenth embodiment of the present invention.
- the output of the channel coding Z decoding processing unit 53b is further illustrated.
- an error rate measuring unit 60 that measures the error rate of user data using an error rate
- an error rate determining unit 61 that compares the obtained error rate with a predetermined threshold value to determine whether it is normal or abnormal.
- the coding / decoding processor 53b Processing based on the determination result of the rate determination unit 61 is performed. Note that the same components as those in FIG. 34 of the eleventh embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. Here, processing different from that in Embodiment 11 will be described.
- the channel coding / decoding processing unit 53b generally performs CRC check.
- the error rate measurement unit 60 aggregates a plurality of CRC check determination results and outputs the aggregation results to the error rate determination unit 61.
- the error rate determination unit 61 reports “error rate error” to the channel coding Z decoding processing unit 53b when the CRCNG is greater than or equal to a predetermined threshold value. For example, it may be determined that “error rate is abnormal” when one of them is CRCNG.
- the channel coding Z decoding processing unit 53b generates transmission data that becomes CRCNG, transmission data that causes an illegal header in layer 2, and transmission data that cannot be assembled.
- error rate measuring unit 60 performs error correction encoding on the data after error correction decoding at the opposite station.
- Re-encoding may be performed by the same process as the process, the re-encoded result may be compared with the code before error correction, and the number of error-corrected bits may be counted.
- the error rate determination unit 61 may determine whether or not “error rate abnormality” based on the threshold value determination of the count value, and report that fact to the channel coding / decoding processing unit 53b.
- the threshold value used in the present embodiment may be provided with hysteresis as shown in FIG. 36 of the twelfth embodiment, for example.
- the additional function in the present embodiment is that when the outer loop adjustment amount # 1 is enabled in the base station (when the uplink transmission power is reduced), transmission from the base station is performed. Effective as a fail-safe function when data power (downlink transmission power) is insufficient
- FIG. 38 is a diagram illustrating a configuration example of the CDMA mobile device according to the fourteenth embodiment, which is effective for the present invention.
- the output of the transmission data presence / absence detection unit 55 is further illustrated.
- the transmission timing for controlling the transmission timing based on the transmission power control value of the mobile station Transmission control unit 62, and transmission unit 52 performs processing based on the transmission timing.
- the same components as those in FIG. 34 of Embodiment 11 described above are denoted by the same reference numerals, and the description thereof is omitted.
- processing different from that in Embodiment 11 will be described.
- layer 2 Generates transmission data that is illegal in the header or transmission data that cannot be assembled.
- the base station when the detection result of the transmission data presence / absence detection unit 55 changes from "no transmission data" to "with transmission data”, the base station is in a range that satisfies QoS. Estimate enough time to determine that mobile device transmission data exists.
- “a sufficient time during which the base station can determine that there is mobile device transmission data” is estimated from the stability of the transmission power of the own device.
- “stable” means, for example, that the accumulated difference of 15 transmission power values is within ⁇ 3 dB.
- “a sufficient time during which the base station can determine that there is mobile device transmission data” can be obtained in advance by simulation and set to a specific fixed value.
- the transmission unit 52 generates the above-mentioned channel coding / decoding processing unit 53c until a sufficient time that allows the base station to determine that there is mobile device transmission data elapses within a range that satisfies QoS. Transmit the transmission data that becomes CRCNG, the transmission data that becomes illegal in the header in layer 2, or the transmission data that cannot be assembled, and then transmit the desired transmission data. This greatly reduces the probability that the base station will miss data from the mobile device.
- Fig. 39 is a diagram showing another configuration of the CDMA mobile device according to the fourteenth embodiment, which is effective for the present invention.
- the base station further transmits.
- a line quality measurement unit 63 that measures the line quality of data is provided, and a transmission timing control unit 62a controls transmission timing based on the output of the transmission data presence / absence detection unit 55 and the output of the line quality measurement unit 63.
- Note that the same components as those in FIG. 38 are given the same reference numerals, and descriptions thereof are omitted. Here, processing different from that in FIG. 38 will be described.
- line quality measurement unit 63 known sequence data of layer 1 or layer 1 signaling Receive quality is measured from information. For example, using a pilot signal that is a known sequence in the 3PCP WCDMA-FDD DPCCH, the SIR is calculated using the dispersion from the ideal phase point as the interference component and the amplitude as the signal component. If the communication system is known to be a single user, the received signal quality can be expressed by the received electric field strength and SNR.
- the transmission timing control unit 62a estimates "a sufficient time during which the base station can determine that there is mobile device transmission data" from the degree of stability of the channel quality, and then resumes transmission.
- “stable” means, for example, that the accumulated difference of 15 SIR measurement results is within ⁇ 3 dB.
- “a sufficient time during which the base station can determine that there is mobile device transmission data” can be obtained in advance by simulation and set to a specific fixed value. As a result, as in the case of FIG. 38, the probability that the base station misses data from the mobile station can be greatly reduced.
- the "sufficient time for the base station to determine that there is mobile device transmission data" is adjusted according to the allowable delay time, allowable error rate, or both of the data transmitted by the mobile device.
- the transmission timing control unit 62 or 62a transmits the transmission so that no delay occurs. Let it begin. When the allowable error rate is low and the allowable delay time is large, transmission is started after the transmission power of the mobile device or the channel quality at the mobile device is sufficiently stabilized. If the transmission data is data in which multiple QoS is multiplexed, the QoS of the data with the shortest allowable delay time and the QoS of the data with the lowest allowable error rate are set as the QoS of the multiplexed data.
- FIG. 40 is a diagram illustrating a configuration example of the CDMA mobile device according to the fifteenth embodiment, which is effective for the present invention.
- the layer 1 signaling information generating unit 64 It has. Note that the same components as those in FIG. 34 of the eleventh embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. Here, processing different from that in Embodiment 11 will be described.
- the layer 1 signaling information generation unit 64 sends a "transmission notice". I believe. This corresponds to the E bit in Figure 6. For example, if the E bit is 1, it is defined that there is transmission data, and if it is 0, there is no transmission data. It is preferable to perform error correction encoding using a plurality of bits, since false detection is reduced.
- the transmission unit 52 resumes transmission after the lapse of time.
- estimating “a sufficient time during which the base station can determine that there is mobile device transmission data” for example, processing similar to that of transmission timing control units 62 and 62a in the embodiment 14 is executed.
- the base station adjusts the outer loop adjustment amount #
- the power that the transmission data presence / absence detecting unit 55 performs the presence / absence determination at the output of the channel coding / decoding processing unit 53d is not limited to this. Immediately after the data is generated from the upper layer, Alternatively, immediately after the data from the host device arrives, it may be determined that the transmission data of the own station is present. In this case, it is possible to reduce a delay when resuming transmission.
- FIG. 41 is a diagram illustrating a configuration example of a CDMA mobile device according to the sixteenth embodiment, which focuses on the present invention.
- the transmission power control unit 57a outputs the transmission data presence / absence detection unit 55 and the transmission power control command extraction unit. Transmission power control is performed based on 56 outputs. Note that the same components as those in FIG. 34 of the eleventh embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. The Here, processing different from that in Embodiment 11 will be described.
- the transmission power control unit 57a predefines the transmission power of the mobile device. Increase the specific amount.
- the specified amount of increase in transmission power is the same as the value of outer loop adjustment amount # 1 set by the base station. Therefore, in this case, it is desirable to set the outer loop adjustment amount # 1 as a fixed value systematically.
- the channel coding / decoding processing unit 53 performs empty data (transmission data to be CRCNG, header illegal in layer 2 prior to user data, as in the above-described eleventh embodiment.
- the transmission power control unit 57a performs control to increase the transmission power of the empty data by the above specific amount.
- the base station indicates that mobile device transmission data exists. Estimate “enough time for judgment”, and then resume transmission. As an example of estimating “a sufficient time for the base station to determine that there is mobile device transmission data”, for example, the same processing as that of transmission timing control units 62 and 62a in the fourteenth embodiment is executed. .
- the transmission power control unit 57a when the detection result of the transmission data presence / absence detection unit 55 changes from "no transmission data" to "with transmission data", for example, Control is performed to increase the transmission power step by step until the specified amount is reached. If the mobile station suddenly increases its transmission power, the amount of interference becomes too large, affecting other users' communications. Therefore, in the present embodiment, in consideration of the transmission power control of other users, for example, the transmission power increase control is performed five times continuously by ldB for each control.
- the transmission power control unit 57a for example, when the outer loop adjustment amount # 1 is enabled in the base station (when the uplink transmission power is reduced), and the transmission data from the base station When the power (downlink transmission power) is not sufficient, control is performed to increase the transmission power by the specific amount, or control to increase the transmission power step by step until reaching a predetermined specific amount. As a result, the outer loop adjustment amount # 1 will not be invalid, Transmission power control is restored to an appropriate level (fail-safe function).
- the same processing as that of channel quality determination unit 59 of the above-described twelfth embodiment is executed.
- the same processing as that of the error rate measurement unit 60 and the error rate determination unit 61 of the above-described Embodiment 13 may be executed. ,.
- the transmission data presence / absence detection unit 55 performs the presence / absence determination based on the output of the channel coding Z decoding processing unit 53.
- the present invention is not limited to this, and immediately after data is generated from an upper layer. Alternatively, it may be determined that the transmission data of the own station is present immediately after the data from the host device arrives. In this case, it is possible to reduce a delay when resuming transmission.
- FIG. 42 is a diagram illustrating a configuration example of the CDMA mobile device according to the seventeenth embodiment that is useful for the present invention.
- the channel quality measurement unit 65 and the transmission A power control command generation unit 66 are denoted by the same reference numerals, and the description thereof is omitted.
- processing different from that in Embodiment 11 will be described.
- the line quality measurement unit 65 uses the received layer 1 known sequence or layer 1 signaling information to check whether the SIR, SINR, SNR, received field strength, or layer 1 signaling information is within the allowable range. Information such as whether or not is generated.
- the transmission power control command generation unit 66 sets the output of the line quality measurement unit 65 to Based on this, at the time of empty data transmission, a transmission power control command is generated so that transmission power control is performed once with information bits of multiple (n) transmission power control commands.
- n transmission power control commands.
- one transmission power control is performed with n transmission power control commands.
- the probability is further improved. Also, especially when there is no user data from the base station, transmission from the base station continues.
- the layer 1 known sequence or the layer 1 signaling information that is being transmitted has lower transmission power than when there is user data, so there is less interference with other users. Therefore, the need for accurate transmission power control is low.
- the transmission data presence / absence detection unit 55 up to the above-mentioned Embodiments 11-11 17 detects the presence / absence of user data of the mobile station, but when there is no transmission data from the base station, If there is no user data for the mobile device, it may be determined that there is no transmission data.
- the presence / absence of transmission data is determined using the determination method of the first and second embodiments.
- the time from the generation of data to be transmitted to the actual transmission is defined as the transmission power value at the mobile station.
- the base station recognizes the R bit (the base station recognizes that the mobile device is in the transmission state). If you are sending layer 1 signaling information), you can use that value.
- the base station and the mobile device according to the present invention are useful for a radio communication system employing CDMA, and in particular, a radio that performs optimum transmission power control when there is no data to be transmitted. Suitable as a communication device.
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- Transmitters (AREA)
Abstract
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Priority Applications (4)
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JP2006527711A JP4425920B2 (ja) | 2004-07-22 | 2004-07-22 | 基地局および移動機 |
CN2004800436547A CN1993906B (zh) | 2004-07-22 | 2004-07-22 | 基站以及移动设备 |
PCT/JP2004/010421 WO2006008820A1 (ja) | 2004-07-22 | 2004-07-22 | 基地局および移動機 |
US11/629,911 US7664523B2 (en) | 2004-07-22 | 2004-07-22 | Base station and mobile apparatus |
Applications Claiming Priority (1)
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PCT/JP2004/010421 WO2006008820A1 (ja) | 2004-07-22 | 2004-07-22 | 基地局および移動機 |
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WO2006008820A1 true WO2006008820A1 (ja) | 2006-01-26 |
Family
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PCT/JP2004/010421 WO2006008820A1 (ja) | 2004-07-22 | 2004-07-22 | 基地局および移動機 |
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US (1) | US7664523B2 (ja) |
JP (1) | JP4425920B2 (ja) |
CN (1) | CN1993906B (ja) |
WO (1) | WO2006008820A1 (ja) |
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US7965640B2 (en) | 2006-05-01 | 2011-06-21 | Ntt Docomo, Inc. | Radio communication method and radio base station apparatus based on variable TTI length control |
JP2012160989A (ja) * | 2011-02-02 | 2012-08-23 | Kddi Corp | 正当な送信電力値から無線品質を判定する無線品質判定装置、プログラム及びシステム |
JP2013005236A (ja) * | 2011-06-16 | 2013-01-07 | Internatl Business Mach Corp <Ibm> | 異なる周波数キャリアを用いたミリ波通信リンク適応 |
US8582204B2 (en) | 2008-06-09 | 2013-11-12 | Sony Corporation | Optical film and method for manufacturing the same, antiglare film, polarizer with optical layer, and display apparatus |
US8672492B2 (en) | 2008-06-09 | 2014-03-18 | Sony Corporation | Optical film and method for manufacturing the same, antiglare film, polarizer with optical layer, and display apparatus |
US9055555B2 (en) | 2006-08-21 | 2015-06-09 | Sony Corporation | Cellular communication system, network controller and method for obtaining feedback from subscriber communication units |
JP2015111912A (ja) * | 2015-02-03 | 2015-06-18 | インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Machines Corporation | 異なる周波数キャリアを用いたミリ波通信リンク適応 |
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JP2006186757A (ja) * | 2004-12-28 | 2006-07-13 | Nec Corp | 無線通信システムにおける送信電力制御方法およびその装置。 |
JP4534799B2 (ja) * | 2005-02-28 | 2010-09-01 | 富士通株式会社 | 無線基地局 |
US8488459B2 (en) * | 2005-03-04 | 2013-07-16 | Qualcomm Incorporated | Power control and quality of service (QoS) implementation in a communication system |
JP2007195076A (ja) * | 2006-01-20 | 2007-08-02 | Nec Corp | 無線通信システムとその送信電力制御方法および装置 |
KR20090115220A (ko) * | 2007-03-01 | 2009-11-04 | 가부시키가이샤 엔티티 도코모 | 기지국장치 및 통신제어방법 |
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US8160075B2 (en) * | 2007-10-01 | 2012-04-17 | Telefonaktiebolaget Lm Ericsson (Publ) | Downlink out of sync detection in continuous packet connectivity |
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JP5423505B2 (ja) * | 2010-03-17 | 2014-02-19 | 富士通株式会社 | 無線基地局及び通信方法 |
WO2011119075A1 (en) * | 2010-03-23 | 2011-09-29 | Telefonaktiebolaget L M Ericsson (Publ) | Uplink load prediction using kalman filters |
JP6014421B2 (ja) * | 2012-08-30 | 2016-10-25 | 株式会社Nttドコモ | 基地局及び送信電力制御方法 |
CN104798404B (zh) * | 2013-02-15 | 2018-07-20 | 夏普株式会社 | 移动站装置、集成电路、通信方法以及通信程序 |
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US11978036B2 (en) | 2022-03-23 | 2024-05-07 | Toshiba Global Commerce Solutions Holdings Corporation | Directional radio frequency identification system |
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2004
- 2004-07-22 CN CN2004800436547A patent/CN1993906B/zh not_active Expired - Fee Related
- 2004-07-22 WO PCT/JP2004/010421 patent/WO2006008820A1/ja active Application Filing
- 2004-07-22 JP JP2006527711A patent/JP4425920B2/ja active Active
- 2004-07-22 US US11/629,911 patent/US7664523B2/en active Active
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WO2000048336A1 (en) * | 1999-02-13 | 2000-08-17 | Samsung Electronics Co., Ltd. | Device and method of continuous outer-loop power control in dtx mode for cdma mobile communication system |
EP1039657A1 (en) * | 1999-03-19 | 2000-09-27 | Alcatel | Method for pilot signal power control in a CDMA mobile radio system, as well as base station and mobile station for such a system |
EP1133079A1 (en) * | 1999-08-27 | 2001-09-12 | Mitsubishi Denki Kabushiki Kaisha | Communication system, transmitter and receiver, and communication method |
JP2004080531A (ja) * | 2002-08-20 | 2004-03-11 | Matsushita Electric Ind Co Ltd | アウターループ送信電力制御方法および無線通信装置 |
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US7965640B2 (en) | 2006-05-01 | 2011-06-21 | Ntt Docomo, Inc. | Radio communication method and radio base station apparatus based on variable TTI length control |
CN101480098B (zh) * | 2006-05-01 | 2012-05-23 | 株式会社Ntt都科摩 | 基于可变传输时间间隔长度控制的无线通信方法及无线基站装置 |
US9055555B2 (en) | 2006-08-21 | 2015-06-09 | Sony Corporation | Cellular communication system, network controller and method for obtaining feedback from subscriber communication units |
US8582204B2 (en) | 2008-06-09 | 2013-11-12 | Sony Corporation | Optical film and method for manufacturing the same, antiglare film, polarizer with optical layer, and display apparatus |
US8672492B2 (en) | 2008-06-09 | 2014-03-18 | Sony Corporation | Optical film and method for manufacturing the same, antiglare film, polarizer with optical layer, and display apparatus |
JP2012160989A (ja) * | 2011-02-02 | 2012-08-23 | Kddi Corp | 正当な送信電力値から無線品質を判定する無線品質判定装置、プログラム及びシステム |
JP2013005236A (ja) * | 2011-06-16 | 2013-01-07 | Internatl Business Mach Corp <Ibm> | 異なる周波数キャリアを用いたミリ波通信リンク適応 |
JP2015111912A (ja) * | 2015-02-03 | 2015-06-18 | インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Machines Corporation | 異なる周波数キャリアを用いたミリ波通信リンク適応 |
Also Published As
Publication number | Publication date |
---|---|
CN1993906B (zh) | 2010-04-28 |
US7664523B2 (en) | 2010-02-16 |
JP4425920B2 (ja) | 2010-03-03 |
US20080014978A1 (en) | 2008-01-17 |
CN1993906A (zh) | 2007-07-04 |
JPWO2006008820A1 (ja) | 2008-05-01 |
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