JPH08168075A - Mobile radio equipment - Google Patents

Abstract

PURPOSE: To perform quick transmission power control of high precision which can follow up the distance variance, fading, or the like in the mobile radio equipment adopting the hybrid CDMA system. CONSTITUTION: A base station transmits and receives a signal after direct diffusion while hopping two frequency bands f1 and f2 . On the side of a mobile station 21, outputs of two carrier generation circuits 38 and 39 are switched by a switch 40; and thereby, the signal is received with the frequency f1 and is transmitted with the frequency f2 when the transmission frequency of the base station is f1 , and the signal is received with the frequency f2 and is transmitted with the frequency f1 when it is f2 . At this time, the reception power level in each hop (duration of the same frequency) is detected by a detection circuit 27 and is used to control the transmission power by a control circuit 34 in the next hop, namely, at the time of transmission with the same frequency as level detection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio device used for radio transmission of a digital car telephone, a mobile telephone or the like.

[0002]

2. Description of the Related Art CDMA (Code Division Multiple Acc
The ess: code division multiple access) system is one of multiple access system technologies when a plurality of stations simultaneously communicate in the same frequency band in wireless communication. Other technologies include
FDMA (Frequency Division Multiple Access) method, TDMA (Time Division Mu
ltiple Access: time division multiple access) method is known, but the CDMA method is a method capable of achieving higher frequency utilization efficiency and accommodating more users than these technologies.

In the CDMA system, multiple access is performed by spread spectrum communication in which the spectrum of an information signal is spread and transmitted in a band sufficiently wider than the original information bandwidth. The direct spread system is a system in which a spread code is directly multiplied by an information signal in spread. The frequency hopping method is a method in which the carrier frequency of a signal modulated with information is discretely switched within a given frequency band. The hybrid CDMA system is a paper "Basic transmission characteristics in coherent hybrid DS-FFH / CDMA mobile radio" (Shigeru Tomisato, Kazuhiko Fukawa, Hiroshi Suzuki, IEICE Tech., RC
S92-109, pp.61-66, 1993-01), a CD that combines a direct spread method and a frequency hopping method.
The MA method.

In the CDMA system using direct spreading, when a desired transmitting station is located far away and an undesired transmitting station (interfering station) is near, the interfering station receives more than the received signal from the desired transmitting station. There is a "far-and-far problem" in which the received power of the signal becomes larger, the cross-correlation between the spread codes cannot be suppressed only by the processing gain (spreading gain), and communication becomes impossible. For this reason, in the cellular system using the direct spread CDMA system, transmission power control according to the state of each transmission line is essential in the uplink from the mobile station to the base station.

Further, as a countermeasure against fading which is a cause of deterioration of line quality in land mobile communication, a method of compensating for an instantaneous value variation of received power by controlling transmission power has been considered.

Japanese Patent Laid-Open No. 4-502841 discloses a direct diffusion CD.
An example of transmission power control of a cellular system using the MA method is shown. FIG. 7 shows the configuration.
In FIG. 7, reference numeral 41 is a base station, 42 is transmission data, 43 is a baseband processing circuit, 44 is a modulator, and 45 is a modulator.
Is an adder, 46 is an antenna, 47 is an analog receiver, 4
8 is a digital receiver, 49 is a reception level detection circuit, 5
0 is the received data. Further, 51 is a mobile station, and 5
2 is an antenna, 53 is an analog receiver, 54 is a digital receiver, 55 is a baseband processing circuit, 56 is received data, 57 is transmission data, 58 is a modulator, 59 is a control processor, and 60 is a transmission level control circuit. .

In the above arrangement, the base station 41 to the mobile station 51
Different frequency bands are used for the downlink to the base station 41 and the uplink to the base station 41 from the mobile station 51. This method is FDD
It is called a (Frequency Division Duplex) system, and has features that the transmitter and the receiver can be operated at the same time, and the transmitter does not interfere with the receiver.

In the FDD system, since different frequency bands are used for the uplink and the downlink, the gradual median fluctuation of the received electric field level is almost the same for the uplink and downlink, but the instantaneous value fluctuation due to fading is not the same. . Therefore, in the transmission power control method, first, the total power level received by the mobile station 51 is detected by the digital receiver 54, and the transmission power level is controlled by the transmission level control circuit 60 using the digital receiver 54. Compensate for the median fluctuation of the reception level. This method is called a loop transmission power control method. Further, since the instantaneous value fluctuation cannot be compensated only by the open loop, the base station 41 detects the power level of the received signal from the mobile station 51 after demultiplexing the multiplexed signal by the reception level detection circuit 49, and as a result, the uplink. The channel state in the frequency band is grasped and transmitted to the mobile station 51 through the downlink, and the mobile station 51 further controls the transmission power to compensate for the instantaneous fading fluctuation. This method is called a closed loop transmission power control method.

As described above, the CDM using the FDD system
In method A, transmission power control is realized by combining open loop and closed loop.

Paper "POWER CONTROL IN PACCKETS SWITCH
ED TIME DIVISION DUPLEX SEQUENSESPREAD SPECTRUM CO
MMUNICATIONS "(R.ESMAILZADEH, M.NAKAGAWA, A.KAJIWAR
A, proc. Of VTC'92.pp. 989-992, 1992), CDMA /
A method of performing transmission power control in the TDD system is shown. TDD (Time Division Duplex) is a transmission / reception same-band system and is also called a ping-pong system, and is a system for performing communication by time-dividing the same radio frequency into transmission / reception. FIG. 8 shows the concept of the TDD method. At time T ₁ , the base station transmits and the mobile station receives, and at time T ₂ , the mobile station transmits and the base station receives. By repeating this, communication using a single frequency band is realized.

Transmission power control in the CDMA / TDD system is based only on open loop, which will be described with reference to FIG. In FIG. 9, 61 is a base station, and 6
Reference numeral 2 is transmission data, 63 is a modulator, 64 is a spreader, 65 is a changeover switch, 66 is an antenna, 67 is a correlator, 68 is a demodulator, and 69 is reception data. Further, 71 is a mobile station, 72 is an antenna, 73 is a changeover switch, 74 is a correlator, 75 is a demodulator, 76 is received data, 77 transmitted data, 78 is a modulator, 79 is a reception level detection circuit, 8
Reference numeral 0 is a transmission level control circuit, and 81 is a spreader.

In the above configuration, at the timing of base station transmission / mobile station reception such as time T _{1 in} FIG. 8, the changeover switch 65 of the base station 61 is connected to the spreader 64 and the changeover switch 73 of the mobile station 71 is changed. It is connected to the correlator 74. Base station 61
Then, the transmission data 62 is modulated by the modulator 63, spread by the spreader 64, and transmitted from the antenna 66.
In the mobile station 71, the antenna 72 receives the signal from the base station 61 that has passed through the transmission path, the correlator 74 detects the correlation, and the demodulator 75 obtains the received data.
Further, the output of the correlator 74 is input to the reception level detection circuit 79, and the reception power of the communication channel addressed to itself is detected. Next, at the timing of mobile station transmission / base station reception at time T ₂ of FIG.
Is connected to the spreader 81, and the changeover switch 65 of the base station 61.
Is connected to the correlator 67. In the mobile station 71, the transmission data 77 is modulated, and in the transmission level control circuit 80, the reception level detection circuit 7 at time T ₁ is set so that the reception power level of the base station 61 becomes constant regardless of phasing or the like.
The output of 9 is used to determine the transmit power. The transmission signal output from the transmission level control circuit 80 is spread by the spreader 81 and transmitted from the antenna 72. Base station 6
In 1, the multiplex signals from a plurality of mobile stations 71 that have passed through the transmission path are received by the antenna 66, the correlator 67 separates the signals from the mobile stations 71 by correlation detection, and the demodulator 68 demodulates them. Received data 69 is obtained.

As described above, in the CDMA / TDD system,
Since the same frequency band is used for the uplink and the downlink, the distance variation of the radio line and the instantaneous value variation of fading are also the same for the uplink and the downlink. Therefore, using only open-loop transmit power control as described above, TDD
This makes it possible to compensate for fluctuations that are slow with respect to the period.

[0014]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In transmission power control in the A / TDD system, since different frequency bands are used for the uplink and the downlink, the gradual median fluctuation of the received electric field level is almost the same in the uplink and downlink, but the instantaneous value fluctuation due to fading is Since they are not the same, transmission power control by closed loop is required, and a means to detect the reception level of all mobile stations to the base station in order to grasp the uplink channel status and a means to report the information to the mobile station are required. However, there is a problem that the device becomes complicated. Also,
When the mobile station knows the line status, there is a delay in the reception level detection processing at the base station and the propagation time when notifying the mobile station, so it is not possible to compensate for fluctuations faster than this delay time. There is.

Further, in the transmission power control in the CDMA / TDD system, the same frequency band is used for the uplink and the downlink, so that the mobile station can know the channel state only by the received signal from the base station, Only the closed loop transmission power control is possible. However, at the timing of mobile station transmission / base station reception, the mobile station is only transmitting, so it is not possible to know the line status at this time,
Even if there is a sudden change in the received power due to shadowing of buildings during this period, it is not possible to follow it. In particular, when the received power increases rapidly, the mobile station signal adversely affects the system. Further, since each mobile station detects the received power level for the signal of the communication channel addressed to itself after the correlation detection, due to the difference in spreading code between each mobile station and the difference in the data of the communication channel, Since the autocorrelation value and the cross-correlation value differ, the accuracy of the received power level detection differs for each mobile station.
Furthermore, if the base station side also controls the transmission power,
Since the transmission level of the base station changes, the mobile station cannot accurately know the line status.

[0016] The present invention solves such a conventional problem, and an object of the present invention is to provide a mobile radio apparatus capable of high-speed and highly accurate transmission power control.

[0017]

In order to achieve the above object, the present invention provides a mobile radio apparatus using a hybrid CDMA system in which direct spreading and frequency hopping are combined as a multiple access system, from a base station to a mobile station. In the downlink and the uplink from the mobile station to the base station, hopping patterns that do not overlap at the same time are selected and multiplexed in the same frequency band.

Further, in the downlink, a pilot channel common to all mobile stations is set in addition to a communication channel for communication.

[0019]

Therefore, according to the present invention, the same frequency band can be used for the up-link and the down-link, and the mobile station immediately grasps the wireless link status by the received signal power from the base station, and the hop ( Same frequency duration)
High-speed transmission power control can be performed in units.

Further, by using the pilot channel, it is possible to know the radio channel state without depending on the fluctuation of the transmission power of the base station in the communication channel, and it is possible for each mobile station to have a factor such as data modulation or spread code difference. By avoiding the difference in the detection accuracy of the received signal power, it is possible to perform the transmission power control with higher accuracy.

[0021]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the configuration of a base station. In FIG. 1, 1 indicates the entire base station, 2 is transmission data, 3 is a modulator, 4 is a spreader, 5 is a pilot channel generator, 6 is an adder, and 7 is a bandpass filter (BPF) for transmission. , 9 is an antenna, 10 is a band filter (BPF) for reception, 11 is a multiplier, 12 is a correlator, 1
3 is a demodulator, 14 is received data, 15 is a carrier (f ₁ ).
A generation circuit, 16 is a carrier wave (f ₂ ) generation circuit, and 17 is a changeover switch.

FIG. 2 shows the configuration of the mobile station. In FIG. 2, 21 indicates the whole mobile station, 22 indicates an antenna, 2
3 is a bandpass filter (BPF) for reception, 24 is a multiplier, 25 is a correlator for pilot channel, 26 is a correlator for communication channel, 27 is a received power level detection circuit, 2
8 is a phase detection circuit, 29 is a synchronization circuit, 30 is a demodulator, 3
1 is received data, 32 is transmitted data, 33 is a modulator, 3
4 is a transmission power level control circuit, 35 is a spreader, 36 is a multiplier, 37 is a band pass filter (BPF) for transmission,
38 is a carrier wave (f ₁ ) generation circuit, 39 is a carrier wave (f ₂ ).
The generation circuit, 40 is a changeover switch. The mobile station 21
Usually, a plurality of base stations 1 exist.

In the present embodiment, the hybrid CDMA system is used as the access system, and the hopping pattern is selected so that the uplink and the downlink do not overlap at the same time at all, and the multiplexing is carried out within the same frequency band. Has been given. FIG. 3 shows the concept, f ₁
It is an example of hopping the two frequency bands of f ₂ and f ₂ . At time T ₁ , the base station transmits at frequency f ₁ and the mobile station transmits at frequency f ₂ . At the next T ₂ , the transmission frequency of the base station is f ₂ and the mobile station frequency is hopping at f ₂ for transmission. The duration of the same frequency is called one hop. Through the above operations, communication using the same frequency band is realized on the uplink and the downlink. When there are multiple mobile stations, the hopping pattern is the same and multiple access is performed by direct spreading.

The base station 1 transmits data to the mobile station 21.
Data 2 is modulated by modulator 3 and spreader 4
Spread with a pre-assigned spreading code. Diffuser 4
Is output from the spreader for another mobile station at the adder 6.
Power and output of pilot channel generator 5 and multiplexed
Be done. The pilot channel should be synchronized with the communication channel
And all the data patterns are "0" or "1"
Using a fixed pattern like this, spread with a specific spreading code,
Further, the transmission power is constant. Multiplexed
The multiplied signal is multiplied by the carrier wave in the multiplier 7, and the BPF 8 is applied.
It passes through and is transmitted from the antenna 9 to the transmission path. Carrier wave
Is the carrier wave (f₁) Generating circuit 15 and carrier wave (f₂)
In the generation circuit 16, each frequency f₁And f₂Transport of
A wave is generated, and the changeover switch 17 is used to set the time T in FIG.₁
In case of f₂, Time T₂In case of f ₁So cut
Used in exchange.

On the receiving side of the base station 1, the received signal from the antenna 9 is passed through the BPF 10 and the multiplier 11 multiplies the carrier by frequency conversion from the RF band to the base band. Carrier also using the output of the carrier (f ₁₎ generating circuit 15 and the carrier (f ₂₎ generation circuit 16 at this time, in the case of the time T ₁ in contrast to the transmitting side by the changeover switch 17 f _1, the time T _2, In this case, switch to f ₂ . The output of the multiplier 11 is input to the correlator for each mobile station, and at the correlator 12 for the mobile station,
Correlation detection is performed using the same spreading code as that used in the spreader 35 of the mobile station 21, the communication channel of this mobile station is separated from the multiplexed signals of a plurality of mobile stations, and the result is input to the demodulator 13.
The demodulator 13 demodulates and obtains received data 14.

In the mobile station 21 shown in FIG. 2, the signal from the base station 1 that has passed through the transmission path is received by the antenna 22,
The frequency is converted from the RF band to the baseband band by passing through the PF 23 and multiplying the carrier wave in the multiplier 24. Carrier, the carrier (f ₁₎ the output of the generator circuit 38 and carrier (f ₂₎ generation circuit 39, when the selector switch 40 at time T ₁ of the FIG. 3 and so f _2, in the case of the time T ₂ f ₁ Switch to and use. Multiplier 24
Is output to the pilot channel correlator 25, the communication channel correlator 26, and the reception power level detection circuit 27.

The pilot channel correlator 25 performs correlation detection by the spreading code used for spreading the pilot channel, separates the pilot channel, and supplies the phase detection circuit 28, the synchronization circuit 29 and the reception power level detection circuit 27. input. The phase detection circuit 28 detects a phase shift due to the fading of the pilot channel, the frequency offset of the carrier wave of transmission and reception, and the like, and inputs it to the demodulator 30. Since the pilot channel and the communication channel use the same carrier and have the same propagation path, the phase shift is considered to be the same. Moreover, since the data pattern of the pilot channel is known, the absolute phase can be easily detected. The synchronization circuit 29 captures the synchronization of the timing of the pilot channel data, and the demodulator 3
Enter 0.

The communication channel correlator 26 separates the communication channel addressed to itself by correlation detection and inputs it to the demodulator 30 and the received power level detection circuit 27. Demodulator 30
Then, the phase shift of the communication channel is corrected using the phase shift input from the phase detection circuit 28, and the synchronization circuit 29
Demodulate using the timing from
Get one.

The reception power level detection circuit 27 detects three of the total power level of the reception signal at the output of the multiplier 24, the communication channel power level and the pilot channel power level, and the transmission power level control circuit 34 detects them. input.

On the transmission side of the mobile station 21, the transmission data 32 to the base station 1 is modulated by the modulator 33 and input to the transmission power level control circuit 34. The transmission power level control circuit 34 controls the transmission power by using each input reception power level and outputs it to the spreader 35. The transmission power control method at this time will be described later. The spreader 35 spreads with the assigned spreading code, and the multiplier 36 multiplies the carrier by the carrier. Carrier, the output of the carrier wave (f ₁₎ generating circuit 38 and the carrier (f ₂₎ generation circuit 39, the changeover switch 40, f ₁ in the case of the time T ₁ in contrast to the reception, in the case of the time T ₂ f Switch to ₂ and use. The output of the multiplier 36 is transmitted from the antenna 22 to the transmission path through the BPF 37.

The transmission power control in this embodiment is based only on open loop. First, pay attention to the frequency f ₂ in FIG. At time T ₁ , the mobile station 21 is receiving at the frequency f ₂ , and the reception power level detection circuit 27 detects the average reception power level during one hop of the pilot channel and the communication channel at this time. The transmission power level control circuit 34 knows the line state at the frequency f ₂ by comparing the detected value with a predetermined reception power level,
When the mobile station 21 transmits using f ₂ at time T ₂ , the transmission power is determined so as to keep the reception power level at the base station 1 constant. At time T ₂ , transmission is performed at the determined power level, and during that time, the reception power level detection circuit 27 detects the total power level of the reception signal at the output of the multiplier 24, and further uses this. Performs transmission power control that follows changes in the reception power level. The value detected at this time is for the frequency f ₁ and the fading is different from the frequency f ₂ being transmitted. In this case, therefore, there is a sudden change in the received power level due to shadowing of a building or the like. It will be compatible. By performing the above processing for both frequency bands f ₁ and f ₂ , transmission power control is realized only by open loop.

Further, by making the transmission power of the pilot channel higher than that of the communication channel in the base station 1 as compared with the present embodiment, it is possible to further improve the detection accuracy of the reception power level of the pilot channel in the mobile station 21, Furthermore, phase detection and synchronization acquisition become easier, and demodulation ability can be improved.

(Embodiment 2) Next, a second embodiment of the present invention will be described. In the present embodiment, the apparatus of FIG. 2 is used to estimate the received power level and control the transmission power by a method different from that of the first embodiment.

FIG. 4 shows one of the hopping patterns shown in FIG.
Focusing on one carrier frequency f, the relationship between transmission and reception is shown. The mobile station receives at the carrier frequency f at times T _{0 to} T ₁ , and at times T _{1 to} T ₂ ,
Transmission is performed at the same frequency f as reception at times T _{0 to} T ₁ . In FIG. 4, it is assumed that N symbols of data are transmitted and received per hop.

The transmission power control method in the above configuration will be described below. In the mobile station in advance, to set the reference transmission power TP _r as the optimal transmission power levels in a radio channel condition that is received by the desired received power level RP _t, and the desired received power level RP _t in the receiving.

Time T₀~ T₁, The mobile station is a symbol
Received power level RP for each₁Is detected and n symbols are transferred.
Moving average A_V1Ask for. Thus moving average A_V1To take
And remove the effect of noise in the detection of received power level
can do. Then T ₁~ T₂Estimated reception at
Power level RP_PIs the moving average A_V1Calculated by the time
T₁~ T₂Transmission power TP₂Used to determine. Time T1
Estimated received power level RP in_PAt time T₀~ T₁To
Moving average A of n symbols_V1Change the last value of
The amount is the moving average A_V1Change amount. Transmit power level
Is determined as follows. Time T₁Estimated received power of
Level RP_PIs the desired received power level RP _tLess than
If the change amount is Δd / Δt, the time T₁~ T₂
Transmission power TP at₂The initial value of is the reference transmission power TP_r
By increasing d ′ further, the change amount of the transmission power is set to Δd ′ / Δt.
I do. By controlling the transmission power in this way, the time
T₁To T₂As long as the line status does not change significantly between
It is possible to keep the received power level of the ground station at an optimum value.
Therefore, highly accurate transmission power control can be performed.

(Embodiment 3) In this embodiment, the method for estimating the received power level in the second embodiment is modified in consideration of the variation pattern of the received power level due to actual fading.

As shown in FIG. 5, the instantaneous value of the received electric field due to the actual fading tends to fall sharply from the state of gentle decrease and then increase sharply. Therefore, when the amount of change in the moving average of the reception power level of n symbols is decreasing, it is necessary to estimate the reception power level in consideration of this tendency.

In this embodiment, as shown in FIG.
Time T₀~ T₁Power level RP at₁Moving flat
Average A_V1If is increasing, as in the second embodiment,
T ₁~ T₂Estimated received power level RP_PAsk and send
Electric power TP₂To determine. On the other hand, as shown in (b), T₀~
T₁Moving average A of received power level_V1When is decreasing
If time T₁~ T₂Estimated received power level RP_PWhen
Tick T₀~ T₁Moving average A of n symbols in_V1The end of
And the actual received power level RP_rFluctuates greatly
However, it is estimated as a level that does not fluctuate over time, and this is
Use transmission power TP₂To determine.

As described above, the received power level is estimated,
Avoiding incorrect estimation by controlling the transmission power,
Highly accurate transmission power control can be performed.

[0041]

As is apparent from the above embodiments, the present invention provides a downlink from a base station to a mobile station in a mobile radio apparatus using a hybrid CDMA system combining direct spreading and frequency hopping as a multiple access system. Since the signal and the uplink from the mobile station to the base station are multiplexed in the same frequency band by selecting hopping patterns that do not overlap at the same time, the mobile station immediately receives the received signal power from the base station. It is possible to provide a mobile wireless device which can know the wireless line state and can perform high-speed and highly accurate transmission power control in hop units.

Further, by using the pilot channel, it is possible to know the radio channel state without depending on the fluctuation of the transmission power of the base station in the communication channel, and for each mobile station which is caused by the difference in data modulation or spread code. By avoiding the difference in the detection accuracy of the received signal power, it is possible to perform the transmission power control with higher accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram of a base station of a mobile station radio apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a mobile station of a mobile station radio apparatus according to a second embodiment of the present invention.

FIG. 3 is a conceptual diagram of channel arrangement according to the present invention.

FIG. 4 is a characteristic diagram showing a relationship between power level and time showing a method of transmission power control in the second embodiment of the present invention.

FIG. 5 is a characteristic diagram of an actual received power level according to the present invention.

FIG. 6 is a characteristic diagram showing a relationship between a power level and a time, which shows a transmission power control method according to a third embodiment of the present invention.

FIG. 7 is a block diagram of a mobile wireless device in a conventional example using the FDD system.

FIG. 8 is a conceptual diagram of channel arrangement in the TDD system.

FIG. 9 is a block diagram of a mobile wireless device in a conventional example using the TDD method.

[Explanation of symbols]

1 Base Station 2 Transmission Data 3 Modulator 4 Spreader 5 Pilot Channel Generation Circuit 6 Adder 7 Multiplier 8 Transmission Bandpass Filter (BPF) 9 Antenna 10 Reception Bandpass Filter (BPF) 11 Multiplier 12 Correlation Device 13 Demodulator 14 Received data 15 Carrier wave (f ₁ ) generation circuit 16 Carrier wave (f ₂ ) generation circuit 17 Changeover switch 21 Mobile station 22 Antenna 23 Bandpass filter (BPF) for reception 24 Multiplier 25 Pilot channel correlator 26 Correlator for Communication Channel 27 Received Power Level Detection Circuit 28 Phase Detection Circuit 29 Synchronous Circuit 30 Demodulator 31 Received Data 32 Transmitted Data 33 Modulator 35 Spreader 36 Multiplier 37 Bandpass Filter (BPF) for Transmission 38 Carrier Wave ( f ₁₎ generating circuit 39 carrier (f ₂₎ generating circuit 0 change-over switch

Claims (10)

[Claims] 1. A base station and a mobile station equipped with a communication means using a hybrid CDMA (code division source access) system that combines direct spreading and frequency hopping as a multiple access system, and an uplink signal from the mobile station to the base station. The downlink signal from the base station to the mobile station is provided with means for selecting a hopping pattern so that they do not overlap at all at the same time, and then multiplexing in the same frequency band. A mobile radio apparatus comprising: means for detecting a reception power level at all of a plurality of hopping frequencies of a channel; and means for controlling transmission power of the same hopping frequency in a transmission signal by using the detected reception power level of the hopping frequency. 2. The means for detecting the reception power level of the mobile station detects the reception power level of the communication channel after the correlation detection and the reception power level of the reception signal before the correlation detection, and controls the transmission power level. The mobile radio apparatus according to claim 1, wherein transmission power control is performed using both of the reception power levels, and transmission power control is performed immediately after detection of the reception power level of a reception signal before correlation detection. 3. A base station and a mobile station provided with a communication means by a hybrid CDMA (code division source access) system that combines direct spreading and frequency hopping as a multiple access system, and an uplink signal from the mobile station to the base station. It has a means to multiplex in the same frequency band after selecting a hopping pattern so that it does not overlap the downlink signal from the base station to the mobile station at the same time. In addition, a pilot channel common to all mobile stations having a fixed data pattern or fixed transmission power as all "0" s or all "1" s is provided, and the base station multiplexes the pilot channel to a downlink. Means for transmitting, the mobile station means for performing correlation detection of the pilot channel, and A means for detecting the received power level at all of the plural hopping frequencies of the outgoing pilot channel and a means for controlling the transmission power of the same hopping frequency in the transmission signal using the received power level of the detected hopping frequency are provided. Mobile radio device. 4. The means for detecting the reception power level of the mobile station detects the reception power level of the pilot channel after the correlation detection and the reception power level of the communication channel after the correlation detection, and controls the transmission power level. 4. The mobile radio apparatus according to claim 3, wherein transmission power control is performed using both of the reception power levels. 5. The means for detecting the reception power level of the mobile station detects the reception power level of the pilot channel after the correlation detection and the reception power level of the reception signal before the correlation detection, and controls the transmission power level. 4. The mobile radio apparatus according to claim 3, wherein the transmission power control is performed using both of the reception power levels, and the reception power level of the reception signal before the correlation detection is performed immediately after the detection. 6. The means for detecting the reception power level of a mobile station detects the reception power level of a pilot channel after correlation detection, the reception power level of a communication channel after correlation detection and the reception power level of a reception signal before correlation detection. Detect and
The means for controlling the transmission power level performs the transmission power control using all the reception power levels, and the reception power level of the reception signal before the correlation detection is immediately controlled after the detection. 3. The mobile wireless device described in 3. 7. The mobile radio apparatus according to claim 3, wherein the mobile station includes means for acquiring and holding synchronization by using a pilot channel, and demodulating data of the communication channel by using the means. 8. The mobile radio apparatus according to claim 3, wherein the mobile station includes means for detecting a phase of a received signal using a pilot channel, and demodulating data of the communication channel using the means. . 9. The means for detecting the reception level of a mobile station comprises:
The means for detecting the reception power level of each symbol within one hop (same frequency duration) and controlling the transmission power, the reception power level obtained from the moving average of the reception power level in a certain symbol, and its variation amount, The mobile radio apparatus according to claim 1, wherein the transmission power control is performed based on the. 10. The means for controlling the transmission power of a mobile station comprises:
10. The mobile radio apparatus according to claim 9, wherein when the amount of change in the received power increases, the transmission power level in the transmission power control decreases with time, and when the amount of change decreases, the transmission power level is kept constant.