JP2004080224A - Combination radio communication terminal station, base station retrieving method therefor and its program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combination radio communication terminal station which detects a base station having a good communication condition within a short time among a plurality of base stations using a code division multiplex communication system, without losing the portability. <P>SOLUTION: A channel presuming unit 51 has a threshold preset for a detection output. It obtains the power of a detection result inputted from a code division multiplex communication base band and compares the power with the threshold to output the comparison result to a channel counter 52. The counter 52 has a counter coincident with a channel number set in a frequency synthesizer 72 and updates the counter upon the frequency setting to the frequency synthesizer. If the power of the detection result is higher than the threshold held in the channel presuming unit 51, the counter 52 stores its count value in a memory 53 to control the existence of the channel detection. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a compound wireless communication terminal station, a base station search method used therefor, and a program therefor, and more particularly, to a wireless communication method using a time division multiplex communication system, which is a mobile communication system, using one wireless communication terminal station. The present invention relates to a wireless communication terminal station that realizes communication and wireless communication using a code division multiplex communication system.
[0002]
[Prior art]
2. Description of the Related Art In recent years, some compound wireless communication terminal stations are used for wireless communication such as mobile communication and correspond to a plurality of communication systems. Users of wireless communication such as mobile communication to which the hybrid wireless communication terminal station belongs are greatly increasing as represented by mobile phones.
[0003]
Originally, frequency is a finite resource, and various multiplex communication systems have been proposed to increase the efficiency of frequency use. As multiplex communication systems, the time division multiplex communication system and the code division multiplex communication system have been spotlighted in recent years.
[0004]
The time division multiplex communication system manages communication channels in time and allocates communication channels to users in units of time. The code division multiplex communication system manages communication channels by codes and codes communication channels by codes. This is a method of assigning to users in units.
[0005]
In contrast to these multiple communication systems, generally, the conventional wireless communication terminal stations are mainly wireless communication terminal stations corresponding only to these individual communication systems, but one of the multiple communication systems has been proposed. It is required that the wireless communication terminal station of this type realize a wireless communication terminal station corresponding to these plural communication systems.
[0006]
Here, the code division multiplex communication system will be described. In the code division multiplex communication system, a technique called spread spectrum for spreading a spectrum of a signal used for communication in a wide band is used. This spread spectrum is a communication technology used for transmission by multiplying the spectrum of the signal to be transmitted by a pseudo-random number code and spreading it over a wide band.When receiving, the same as the pseudo-random number code multiplied when spreading the spectrum of the transmitted signal And cannot be demodulated unless they are multiplied at the same timing.
[0007]
Spread spectrum is enhanced in confidentiality by this feature, and is a communication system that has been the most spotlighted in recent years. As a pseudo random number code used for spreading the spectrum of a transmission signal, a code having a feature that the autocorrelation is maximized at the head of the code sequence is selected, and a PN (Pseudo Noise) code or the like is generally used. . The receiver can detect the timing at which the received signal is multiplied by the pseudo-random number code by detecting the head of the pseudo-random number code from the received signal.
[0008]
Next, a standby operation of the wireless communication terminal station will be described. Generally, the standby operation of the wireless communication terminal station is an operation of the wireless communication terminal station when the wireless communication terminal station does not exchange data such as voice and image with the base station.
[0009]
During the standby operation, the wireless communication terminal station receives a paging channel periodically transmitted from the base station and checks whether a communication request has been transmitted from the base station to the wireless communication terminal station. When a communication request has been transmitted, the wireless communication terminal station starts communication of data such as voice and image in response to the communication request. When the communication request is not transmitted, the communication of data such as voice and image is not performed, and the receiving operation of the paging channel is periodically repeated again.
[0010]
Also, looking at recent communication situations, it is necessary to use frequencies effectively in response to the rapid increase in mobile phone subscribers. It is required to have an operation and a function of detecting a base station in a relatively good communication state and changing the base station with which to communicate as needed.
[0011]
Generally, this operation is called a base station monitoring operation, in which the wireless communication terminal station periodically monitors the communication state of a plurality of base stations around the currently communicating base station, Is compared with the communication state of the peripheral base station. If the communication state of the peripheral base station is good, an operation of changing the base station with which the communication is performed is executed.
[0012]
[Problems to be solved by the invention]
In the above-described conventional code division multiplex communication system, the receiver cannot demodulate the received signal unless the receiver takes a cross-correlation between the received signal and the pseudo random code and detects the head of the pseudo random code. If the code length of the pseudo-random number code is increased, higher confidentiality can be realized, but on the other hand, there is a problem that it takes time for the receiver to detect the head of the pseudo-random number code. That is, it takes time for the wireless communication terminal station to demodulate the received signal, and it takes time to detect and establish synchronization with the base station with which the wireless communication terminal station communicates.
[0013]
Next, the standby operation and the base station monitoring operation will be described with reference to FIG. 1 with respect to problems in a composite wireless communication terminal station supporting the code division multiplex communication system and the time division multiplex communication system.
[0014]
FIG. 1 shows one configuration of a composite type wireless communication terminal station. An antenna 1, an antenna switch 2, a code division multiplex communication radio 3, a time division multiplex communication radio 4, and a control unit 5 are shown. It is composed of The code division multiplex communication radio 3 comprises a code division multiplex communication receiver 6, a code division multiplex communication transmitter 7, and a code division multiplex communication baseband unit 8, and the time division multiplex communication radio 4 It is composed of a division multiplex communication receiver 9, a time division multiplex communication transmitter 10, and a time division multiplex communication baseband unit 11.
[0015]
The code division multiplexing communication receiver 6 and the code division multiplexing communication baseband unit 8 constituting the code division multiplexing communication radio 3 and the code division multiplexing communication receiver among the constituent elements constituting the control unit 5 respectively. FIGS. 7 and 8 show parts related to No. 6. FIG. However, in FIGS. 7 and 8, the code division multiplex communication baseband unit 130 and the control unit 150 are used.
[0016]
The code division multiplex communication receiver includes an antenna duplexer 101, a high-frequency amplifier 102, a first bandpass filter 103, a frequency converter 104, a second bandpass filter 105, a variable gain amplifier 106, It comprises a quadrature demodulator 107, a first local oscillator 108, a second local oscillator 109, and a frequency synthesizer 110.
[0017]
The code division multiplex communication baseband unit 130 includes first low-pass filters 131 and 132, first A / D (analog / digital) converters 133 and 134, a despreading unit 135, and a reception digital signal processing unit. Unit 135, reception digital signal processing unit 136, transmission digital signal processing unit 137, spreading unit 138, D / A (digital / analog) converters 139 and 140, and second low-pass filter 141, 142. The control unit 150 includes a reception data processing unit 151, a frequency synthesizer control unit 152, and a transmission data generation unit 153.
[0018]
A case will be described in which the base station monitor operation is performed using the code division multiplex communication method while the hybrid wireless communication terminal station shown in FIG. 1 is performing the standby operation using the time division multiplex communication method.
[0019]
Since the hybrid wireless communication terminal station shown in FIG. 1 performs a standby operation using the time division multiplex communication system, the antenna 1 is connected to the time division multiplex communication radio 4 via the antenna switch 2. I have. When the base station monitor operation is performed using the code division multiplex communication system, the antenna 1 must be connected to the code division multiplex communication radio 3, but the hybrid wireless communication terminal station uses the time division multiplex communication method. Therefore, the connection switching of the antenna 1 must be controlled by using the antenna switch 2.
[0020]
That is, the hybrid wireless communication terminal station uses the time when the time division multiplex communication radio 4 communicates with the base station using the time division multiplex communication method, and the time when the code division multiplex communication radio 3 uses the code division multiplex communication method. And the time to communicate with the base station. In the standby operation, the antenna 1 is connected to the time division multiplex communication radio 4 during a time when the time division multiplex communication radio 4 must receive the paging channel transmitted from the base station using the time division multiplex communication method. The antenna switcher 2 is controlled as described above, and the time required for the radio equipment 3 for code division multiplex communication to receive the signal transmitted from the base station using the code division multiplex communication method in the base station monitor operation is determined. The antenna switch 2 must be controlled so that the antenna 1 is connected to the code division multiplex communication radio 3.
[0021]
However, in the code division multiplex communication method, as described above, since it takes time to detect the base station and establish synchronization, the code division multiplex communication radio 3 communicates with the base station using the code division multiplex communication method. In the meantime, the time for the standby operation is reached, and the antenna 1 is in the time division multiplex communication even though the code division multiplex communication radio 3 is communicating with the base station using the code division multiplex communication method. A problem arises in that the wireless device 4 is switched to the wireless device 4.
[0022]
The reason will be described with reference to FIGS. A radio signal transmitted from a base station (not shown) is received by the antenna 1, and the antenna duplexer 101, the high-frequency amplifier 102, the first bandpass filter 103, the frequency converter 104, the second bandpass filter 105, Via the variable amplifier 106 and the quadrature demodulator 107, it is input to the first low-pass filters 131 and 132 of the code division multiplex communication baseband unit 130 as a baseband reception signal.
[0023]
The received signals that have passed through the first low-pass filters 131 and 132 are converted from analog signals to digital signals by first A / D converters 133 and 134, despread by a despreading unit 135, and receive digital signals. The data is input to the processing unit 136. The reception digital signal processing unit 136 performs signal processing such as error correction on the received signal, and outputs the signal to the reception data processing unit 151 of the control unit 150.
[0024]
The received data processing unit 151 determines from the input received data whether the base station that transmitted the received data is a base station whose communication state of the base station should be checked, and if the base station should be checked, Another transmission signal is received, and the reception state of the base station is checked. On the other hand, when the communication state of the base station is not the base station to be checked, the base station issues an instruction to the frequency synthesizer control unit 152 to switch the reception frequency. The frequency synthesizer control unit 152 sets another frequency for the frequency synthesizer 110 of the code division multiplex communication baseband unit 130 and executes a process of switching the reception frequency.
[0025]
The frequency synthesizer 110 compares the frequency set by the frequency synthesizer control unit 152 with each of the first local oscillation signal from the first local oscillator 108 and the second local oscillation signal from the second local oscillator 109. The frequency synthesizer 110 sends a correction signal based on the comparison result to each of the first local oscillator 108 and the second local oscillator 109, and outputs the first local oscillator signal from the first local oscillator 108 and the second local oscillator. Each of the second local oscillation signals from the first local oscillator 108 and the second local oscillator 109 is controlled so that each of the second local oscillation signals from the first local oscillator 109 has the frequency set by the frequency synthesizer control unit 152. Of the second local oscillation signal is stabilized.
[0026]
Thereafter, the code division multiplex communication radio 3 again receives a signal from another base station, repeats the above-described processing, and repeats the operation of searching for a base station whose communication state of the base station should be checked.
[0027]
As described above, in the conventional hybrid wireless communication terminal station, the received signal must be subjected to digital signal processing such as despreading and error correction, and it is necessary to determine whether the received base station is a target for investigation. In addition, since it takes time, the above-described problem occurs.
[0028]
As a method for solving the above-mentioned problem, a method in which the composite wireless communication terminal station has a plurality of antennas 1 and the antenna switch 2 is eliminated can be considered. Another problem occurs in that the volume and mass of the wireless communication terminal station are increased and portability is deteriorated.
[0029]
Therefore, an object of the present invention is to solve the above problems and detect a base station in a good communication state from a plurality of base stations using a code division multiplex communication method within a short time without impairing portability. It is an object of the present invention to provide a combined wireless communication terminal station capable of performing the same, a base station search method used therefor, and a program therefor.
[0030]
[Means for Solving the Problems]
A combined wireless communication terminal according to the present invention comprises a time division multiplexing radio means for communicating with a first base station using a time division multiplexing communication method and a second means using a code division multiplexing communication method. And a code division multiplex communication wireless means for communicating with the base station of the present invention, wherein the terminal performs a standby operation with the first base station. Means for investigating the communication state of the second base station when the communication is in progress.
[0031]
A base station search method according to the present invention includes a time division multiplex communication radio unit for communicating with a first base station using a time division multiplex communication method and a second base station using a code division multiplex communication method. A method of searching for a base station of a hybrid wireless communication terminal station including a code division multiplex communication wireless means for communicating with a base station, wherein the terminal performs a standby operation with the first base station. Investigating the communication state of the second base station when performing.
[0032]
A program for a base station search method according to the present invention comprises a time division multiplex communication radio means for communicating with a first base station using a time division multiplex communication method and a second means using a code division multiplex communication method. And a code division multiplexing communication radio means for communicating with a base station of the hybrid wireless communication terminal station. A process of managing the presence or absence of channel detection by comparing the detection result of the detection means for detecting a channel with a preset threshold value, and a channel counter for counting the count value for channel detection based on the comparison result. A process for counting up and a process for storing the count value of the channel counter in the memory when the channel detection is determined based on the comparison result are executed.
[0033]
That is, the composite wireless communication terminal station of the present invention includes a radio for time division multiplex communication and a radio for code division multiplex communication, and performs a standby operation with a base station using the time division multiplex communication method. In this case, a base station using a communicable code division multiplex communication system can be searched.
[0034]
In the hybrid wireless communication terminal according to the present invention, a distributing unit and a detecting unit are provided in a part of the wireless unit for code division multiplex communication which processes a received signal in an intermediate frequency band, and a channel estimating unit and a channel A counter means and a memory means are provided, the count value of the channel counter means is made to match the frequency set in the frequency synthesizer means, and the power of the received signal detected by the detection means and the channel estimation means are held in advance. If the detection result of the detection means is larger than the threshold value, it is determined that a reception channel has been detected, the count value of the channel counter means is stored in the memory means, and the code division multiplex communication method is used near the terminal. Is searched in advance, and while performing a standby operation with the base station using the time division multiplex communication method, communication is performed. When searching a base station using the ability of code division multiple access communication system is characterized in that to shorten the time required for despreading required by code division multiple access communication system.
[0035]
More specifically, the hybrid wireless communication terminal of the present invention includes an antenna, an antenna switch, a code division multiplex communication radio, a time division multiplex communication radio, and a control unit. ing. The radio for code division multiplex communication comprises a code division multiplex communication receiver, a code division multiplex communication transmitter and a code division multiplex communication baseband unit, and the radio for time division multiplex communication is a time division multiplex communication receiver. , A time division multiplex communication transmitter, and a time division multiplex communication baseband unit.
[0036]
Further, the code division multiplex communication receiver is an antenna duplexer, a high-frequency amplifier, a first bandpass filter, a frequency converter, a second bandpass filter, a distributor, a variable gain amplifier, It comprises a quadrature demodulator, a detection circuit, a first local oscillator, a second local oscillator, and a frequency synthesizer.
[0037]
The detection circuit includes an amplifier, a detector, and a low-pass filter, and the code division multiplex communication baseband unit includes a second A / D converter, a first low-pass filter, A first A / D converter, a despreading unit, a reception digital signal processing unit, a transmission digital signal processing unit, a spreading unit, a D / A converter, and a second low-pass filter; It is configured.
[0038]
The control unit further includes a channel estimating unit connected to the second A / D converter constituting the code division multiplex communication baseband unit, a channel counter, a memory, and a frequency constituting the code division multiplex communication receiver. A frequency synthesizer control unit connected to the synthesizer, a reception data processing unit connected to a reception digital signal processing unit forming a code division multiplex communication baseband unit, and a transmission digital signal processing forming a code division multiplex communication baseband unit And a transmission data generation unit connected to the transmission unit.
[0039]
In the hybrid wireless communication terminal according to the present invention, as described above, a distributor and a detection circuit are provided in a portion of the code division multiplex communication receiver that processes a received signal in the intermediate frequency band, and a channel estimation unit is provided in the control unit. , A channel counter, and a memory.
[0040]
The distributor distributes the received intermediate frequency band received signal to the variable gain amplifier and also to the detection circuit. Further, the detection circuit performs envelope detection on the input received signal in the intermediate frequency band, and outputs a detection result to the channel estimation unit via the second A / D converter. The count value of the channel counter is made to match the frequency set in the frequency synthesizer, and after the frequency is set in the frequency synthesizer, the power of the input detection result and the channel estimator held in the channel estimator in advance are held. If the detection result is larger than the threshold value, it is determined that there is a base station using the code division multiplexing communication system near the own terminal, and the count value of the channel counter is stored in the memory. Works as follows.
[0041]
Therefore, the hybrid wireless communication terminal station of the present invention searches for a base station using the code division multiplex communication method near its own terminal while performing a standby operation with the base station using the time division multiplex communication method. However, when the operation of detecting a communicable base station is performed, the despreading process required in the code division multiplex communication method is performed even within a relatively short time such as a paging period by the time division multiplex communication method. Without performing, it is possible to search for a base station present in the vicinity of the own terminal, and when detecting a communicable base station, a limited frequency based on the counter value of the channel counter stored in the memory is used. It is possible to perform the despreading process required in the code division multiplexing communication method only for the received signal, and thus it is possible to shorten the time for detecting a nearby base station with which communication is possible.
[0042]
This is because the counter value of the channel counter is made to match the frequency set in the frequency synthesizer, and each time the frequency is changed, the detection result of the detection circuit is compared with a threshold value previously held in the channel estimation unit, and the detection result is obtained. Is larger than the threshold value, it is determined that there is a reception channel, and the count value of the channel counter is stored in the memory. This is because the search for the frequency is performed.
[0043]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a hybrid wireless communication terminal according to one embodiment of the present invention. In FIG. 1, a hybrid wireless communication terminal according to one embodiment of the present invention includes an antenna 1, an antenna switch 2, a code division multiplex communication radio 3, a time division multiplex communication radio 4, and a control unit 5. And a recording medium 12.
[0044]
The code division multiplex communication radio 3 comprises a code division multiplex communication receiver 6, a code division multiplex communication transmitter 7, and a code division multiplex communication baseband unit 8, and the time division multiplex communication radio 4 It is composed of a division multiplex communication receiver 9, a time division multiplex communication transmitter 10, and a time division multiplex communication baseband unit 11.
[0045]
The antenna 1 is connected to the antenna switching unit 2, and the antenna switching unit 2 is connected to the code division multiplex communication radio 3 and the time division multiplex communication radio 4, and the code division multiplex communication radio 3 and the time division multiplex communication. The wireless device 4 is connected to the control unit 5. The control unit 5 controls each unit by executing a computer-executable program stored in the recording medium 12.
[0046]
The code division multiplex communication receiver 6 and the code division multiplex communication transmitter 7 are connected to the code division multiplex communication baseband unit 8 to constitute the code division multiplex communication radio 3. Similarly, the time division multiplex communication receiver 9 and the time division multiplex communication transmitter 10 are connected to the time division multiplex communication baseband unit 11 to constitute the time division multiplex communication radio 4.
[0047]
FIG. 2 is a block diagram showing a configuration of the code division multiplex communication receiver 6 of FIG. In FIG. 2, the code division multiplex communication receiver 6 includes an antenna duplexer 61, a high frequency amplifier 62, a first bandpass filter 63, a frequency converter 64, a second bandpass filter 65, It comprises a device 66, a variable amplifier 67, a quadrature demodulator 68, a detection circuit 69, a first local oscillator 70, a second local oscillator 71, and a frequency synthesizer 72.
[0048]
FIG. 3 is a block diagram showing the configuration of each of the code division multiplex communication baseband unit 8 of FIG. 1 and the detection circuit 69 of FIG. 3, the detection circuit 69 includes an amplifier 691, a detector 692, and a low-pass filter 693. The code division multiplex communication baseband unit 8 includes first low-pass filters 81 and 82, first A / D (analog / digital) converters 83 and 84, a despreading unit 85, and a reception digital signal processing unit. Unit 86, a transmission digital signal processing unit 87, a spreading unit 88, D / A (digital / analog) converters 89 and 90, second low-pass filters 91 and 92, and a second A / And a D converter 93.
[0049]
FIG. 4 is a block diagram showing the configuration of the control unit 5 of FIG. 4, the control unit 5 includes a channel estimation unit 51, a channel counter 52, a memory 53, a frequency synthesizer control unit 54, a reception data processing unit 55, and a transmission data generation unit 56.
[0050]
The configuration of the hybrid wireless communication terminal according to one embodiment of the present invention will be described in detail with reference to FIGS. Hereinafter, the relevant portions of the code division multiplex communication receiver 6, the code division multiplex communication baseband unit 8, and the control unit 5 will be described.
[0051]
In the code division multiplex communication receiver 6, an antenna common input / output terminal of the antenna sharing device 61 is connected to the antenna switching device 2, and a transmission input terminal of the antenna sharing device 61 is connected to the code division multiplex communication transmitter 7. The reception output end of the antenna duplexer 61 is connected to the input end of the high-frequency amplifier 62, and the output end of the high-frequency amplifier 62 is connected to the input end of the first bandpass filter 63. The output terminal is connected to the wireless band signal input terminal of the frequency converter 64.
[0052]
The local oscillator signal input terminal of the frequency converter 64 is connected to the output terminal of the first local oscillator 70, and the output terminal of the first local oscillator 70 is also connected to the first local oscillator signal input terminal of the frequency synthesizer 72. Have been. The intermediate frequency output terminal of the frequency converter 64 is connected to the input terminal of the second bandpass filter 65, and the output terminal of the second bandpass filter 65 is connected to the input terminal of the distributor 66.
[0053]
A first output terminal of the divider 66 is connected to an input terminal of the variable gain amplifier 67, and a second output terminal of the divider 66 is connected to an input terminal of the detection circuit 69. An output terminal of the detection circuit 69 is connected to a detection signal input terminal of the code division multiplex communication baseband unit 8. The output terminal of the variable gain amplifier 67 is connected to the intermediate frequency signal input terminal of the quadrature demodulator 68, and the local oscillation signal input terminal of the quadrature demodulator 68 is connected to the output terminal of the second local oscillator 71.
[0054]
An output terminal of the second local oscillator 71 is connected to a second local oscillation signal input terminal of the frequency synthesizer 72. A baseband signal output terminal of the quadrature demodulator 68 is connected to a reception baseband signal input terminal of the code division multiplex communication baseband unit 8, and a transmission baseband signal output terminal of the code division multiplex communication baseband unit 8 is code division multiplex communication. It is connected to the baseband signal input terminal of the transmitter 7.
[0055]
The input terminal of the amplifier 691 of the detection circuit 69 is connected to the second output terminal of the distributor 66, the output terminal of the amplifier 691 is connected to the input terminal of the detector 692, and the output terminal of the detector 692 is connected to the low-pass filter. It is connected to the input terminal of the device 693. An output terminal of the low-pass filter 693, that is, an output terminal of the detection circuit 69, is connected to an analog signal input terminal of the second A / D converter 93 constituting the code division multiplex communication baseband unit 8.
[0056]
The input terminals of the first low-pass filters 81 and 82 constituting the code division multiplex communication baseband unit 8 are connected to the baseband signal output terminal of the quadrature demodulator 68, and the first low-pass filters 81 and 82 are connected to each other. The output terminal 82 is connected to the analog signal input terminals of the first A / D converters 83 and 84. The digital signal output terminals of the first A / D converters 83 and 84 are connected to the input terminal of the despreading unit 85, and the output terminal of the despreading unit 85 is connected to the reception digital signal processing unit 86, The output end of the unit 86 is connected to the control unit 5.
[0057]
The input terminal of the transmission digital signal processing unit 87 constituting the code division multiplex communication baseband unit 8 is connected to the output terminal of the control unit 5, and the output terminal of the transmission digital signal processing unit 87 is connected to the input terminal of the spreading unit 88. The output terminal of the spreading unit 88 is connected to the digital signal input terminal of the D / A converters 89 and 90, and the analog signal output terminal of the D / A converters 89 and 90 is connected to the second low-pass filter 91. , 92, and the output terminal of the second low-pass filter 91, 92 is connected to the baseband signal input terminal of the code division multiplex communication transmitter 7.
[0058]
A digital signal output terminal of a second A / D converter 93 constituting the code division multiplex communication baseband unit 8 is connected to an input terminal of the channel estimation unit 51 of the control unit 5, and an output terminal of the channel estimation unit 51 is It is connected to the input terminal of the channel counter 52. The channel counter 52 is connected to the memory 53 and the frequency synthesizer control unit 54.
[0059]
A control signal output terminal of the frequency synthesizer control unit 54 is connected to a control signal input terminal of a frequency synthesizer 72 included in the code division multiplex communication receiver 6. Further, the reception data processing section 55 is connected to a reception digital signal processing section 86 constituting the code division multiplex communication baseband section 8, and the transmission data generation section 56 is constituted of a transmission digital signal processing constituting the code division multiplex communication baseband section 8. It is connected to the unit 87.
[0060]
FIG. 5 is a diagram showing a reception cycle of a paging channel received by the radio equipment for time division multiplex communication 4 of FIG. 1 and a timing at which the radio equipment for code division multiplex communication 3 detects a channel. FIG. 6 is a flowchart illustrating the operation of the control unit 5. The operation of the hybrid wireless communication terminal according to one embodiment of the present invention will be described with reference to FIGS. The processing illustrated in FIG. 6 is realized by the control unit 5 executing a program on the recording medium 12. First, the receiving operation of the code division multiplex communication radio 3 will be described.
[0061]
A radio communication signal transmitted from a base station (not shown) is received by an antenna 1 and input to a code division multiplex communication radio 3 via an antenna switch 2. The switching control of the antenna switch 2 is performed such that the antenna 1 is connected to the code division multiplex communication radio 3 when the hybrid wireless communication terminal station is communicating with the base station using the code division multiplex communication method. Is performed, the wireless communication signal used for communication is transmitted to the code division multiplex communication radio 3, and the hybrid wireless communication terminal station is communicating with the base station using the time division multiplex communication method. Next, switching control is performed so that the antenna 1 is connected to the time division multiplex communication radio 4, and a radio signal used for communication is transmitted to the time division multiplex communication radio 4.
[0062]
The received radio signal output from the antenna switching device 2 is input to the antenna sharing device 61, where it is divided into a radio signal in the transmission frequency band and a radio signal in the reception frequency band. A transmission signal is generated by the transmission data generation unit 56 from the transmission radio signal transmitted from the code division multiplex communication radio device 3, and the transmission digital signal processing unit 87, the spreading unit 88, the D / A converters 89 and 90, and the second , Are frequency-converted by the code division multiplex communication transmitter 7 into transmission signals in the radio frequency band, and transmitted from the antenna 1 through the antenna duplexer 61 and the antenna switch 2 to the base station. Sent to.
[0063]
The reception signal output from the reception signal output terminal of the antenna duplexer 61 is amplified by the high frequency amplifier 62 that amplifies only the reception signal in the radio frequency band, and is input to the first bandpass filter 63. The first bandpass filter 63 is a bandpass filter that passes only a reception signal in a radio band received by the code division multiplexing communication radio 3 among signals in the radio frequency band, and is a first bandpass filter. The received signal output from 63 is input to frequency converter 64.
[0064]
The frequency converter 64 uses the first local oscillation signal output from the first local oscillator 70 to convert the frequency of the input received signal into a received signal in the intermediate frequency band. The intermediate frequency band reception signal output from the frequency converter 64 is input to the second bandpass filter 65. The second bandpass filter 65 is a bandpass filter that passes only the reception signal in the intermediate frequency band used by the code division multiplex communication radio 3 among the signals in the intermediate frequency band. The received signal in the intermediate frequency band output from the device 65 is input to the distributor 66.
[0065]
The divider 66 has a first output terminal and a second output terminal. The received signal of the intermediate frequency band output from the first output terminal of the distributor 66 is input to the variable gain amplifier 67, The received signal of the intermediate frequency band output from the output terminal is input to the detection circuit 69. The variable gain amplifier 67 controls the gain so that the power of the received signal input to the first A / D converters 83 and 84 constituting the code division multiplex communication baseband unit 8 becomes constant.
[0066]
The intermediate frequency band received signal output from the variable gain amplifier 67 is input to the quadrature demodulator 68. The quadrature demodulator 68 uses the second local oscillation signal output from the second local oscillator 71 to frequency-convert the input reception signal in the intermediate frequency band into a reception signal in the baseband and performs quadrature demodulation. , And I and Q components of the baseband. The received signals of the I component and the Q component of the baseband output from the quadrature demodulator 68 pass through the first low-pass filters 81 and 82 constituting the code division multiplex communication baseband unit 8, and the first A / A signals The signals are input to D converters 83 and 84.
[0067]
The frequency synthesizer 72 compares the frequency set by the frequency synthesizer control unit 54 with each of the first local oscillation signal from the first local oscillator 70 and the second local oscillation signal from the second local oscillator 71. The frequency synthesizer 72 sends a correction signal based on the comparison result to each of the first local oscillator 70 and the second local oscillator 71, and outputs the first local oscillator signal from the first local oscillator 70 and the second local oscillator. Each of the second local oscillation signals from the first local oscillator 70 is controlled so as to have a frequency set by the frequency synthesizer control unit 54, and the first local oscillation signal from the first local oscillator 70 and the second local oscillator 71 Of the second local oscillation signal is stabilized.
[0068]
The first low-pass filters 81 and 82 are low-pass filters that prevent aliasing distortion generated in the first A / D converters 83 and 84. The received signals input to the first A / D converters 83 and 84 are converted from analog signals to digital signals, and input to the despreading unit 85. The received signal input to the despreading unit 85 is despread, and input to the received digital signal processing unit 86. The reception digital signal processing unit 86 performs digital signal processing such as error correction on the reception signal, and outputs the signal to the reception data processing unit 51 constituting the control unit 5. The reception data processing unit 51 demodulates data such as voice or image from the input reception signal and outputs the reception data to a display unit or a voice output unit (not shown).
[0069]
The received signal of the intermediate frequency band output from the second output terminal of the divider 66 and input to the detection circuit 69 is subjected to envelope detection by the detector 692 via the amplifier 691 and is passed through the low-pass filter 693. , To the second A / D converter 93. The second A / D converter 93 converts the input detection signal from an analog signal to a digital signal, and outputs the converted signal to the channel estimation unit 51 included in the control unit 5.
[0070]
The channel estimating unit 51 is provided with a threshold value for the detection output in advance. The power of the detection result input to the channel estimating unit 51 is obtained, and the obtained power is compared with the threshold value. Output to The channel counter 52 has a counter (not shown) that matches the channel number set in the frequency synthesizer 72, and is configured to update the counter in accordance with the frequency setting in the frequency synthesizer 72. When the power of the detection result is larger than the threshold value held in the channel estimator 51, the channel estimator 51 stores the count value of the channel counter 52 in the memory 53 and determines whether or not the channel is detected. Managing.
[0071]
The channel counter 52 resets the count value in the above counter (step S1 in FIG. 6). Next, the frequency synthesizer control unit 54 sets the frequency that matches the count value in the channel counter 52 in the frequency synthesizer 72 (step S2 in FIG. 6).
[0072]
By setting the frequency in the frequency synthesizer 72, the received signal received by the antenna 1 is frequency-converted by the frequency converter 64 into a received signal in the intermediate frequency band, and is input to the detection circuit 69 via the distributor 66. You. The detection circuit 69 detects the received intermediate frequency band received signal, and outputs the detection result to the channel estimation unit 51 via the second A / D converter 93. The channel estimation unit 51 obtains the power of the detection result output from the detection circuit 69, and compares it with the threshold value stored in advance by the channel estimation unit 51 (step S3 in FIG. 6).
[0073]
As a result of the comparison in the channel estimation unit 51, that is, when the power of the detected signal is smaller than the threshold (step S4 in FIG. 6), the count value in the channel counter 52 is counted up (step S8 in FIG. 6), Returning to step S2 again, the frequency synthesizer control unit 54 sets a frequency corresponding to the count value to the frequency synthesizer 72, and compares the detection result with the threshold value held in the channel estimation unit 51. Repeat the control.
[0074]
On the other hand, when the power of the detection result output from the detection circuit 69 is larger than the threshold value held in the channel estimation unit 51 (step S4 in FIG. 6), the count value of the channel counter 52 is stored in the memory 53. (Step S5 in FIG. 6), the detection of the channel is managed (step S6 in FIG. 6), and it is confirmed whether the count value of the channel counter 52 is the count end value (MAX) (step S7 in FIG. 6).
[0075]
If the count value of the channel counter 52 is not the count end value, the count value of the channel counter 52 is counted up (step S8 in FIG. 6), the frequency setting to the frequency synthesizer 72 is performed, the detection result is compared, and a signal is detected. , The above control of storing the count value in the memory 53 is performed. If the count value of the channel counter 52 is the count end value, the frequency detection processing ends.
[0076]
Next, the hybrid wireless communication terminal according to one embodiment of the present invention performs a standby operation with the base station using the time division multiplex communication method, and the time division multiplex communication radio constituting the hybrid wireless communication terminal A description will be given of a control method in which the code division multiplex communication radio 3 constituting the composite type radio communication terminal detects a channel while the standby radio 4 is performing the standby operation.
[0077]
FIG. 5 shows the reception cycle of the paging channel received by the radio equipment for time division multiplex communication 4 and the timing at which the radio equipment for code division multiplex communication 3 performs channel detection. Time t1 is a period during which the time-division multiplex communication radio 4 is receiving the paging channel, time t2 is a standby period of the time-division multiplex communication radio 4, and time t3 is the time between time t1 and time t2. The sum is the paging cycle of the time division multiplex communication radio 4.
[0078]
On the other hand, time t4 is a time (pre-search period of the active cell) in which the code division multiplex communication radio 3 checks whether there is a base station using the code division multiplex communication method near the hybrid wireless communication terminal station. , Time t5 is a period for investigating the communication state of the base station detected during the period of time t4 (monitoring period of the cell), and time t6 is an inspection period for periodically performing the inspection (monitoring period of the active cell). Represents
[0079]
When the hybrid wireless communication terminal station according to one embodiment of the present invention is performing a standby operation with a base station communicating using the time division multiplex communication method, the antenna 1 is switched by the antenna switching device 2 for a period of time t3. During the period of time t1, it is connected to the radio equipment for time division multiplex communication 4. In addition, during the period of time t2 (= period of time t4), the antenna 1 is connected to the code division multiplex communication radio 3 by the antenna switching unit 2.
[0080]
First, the hybrid wireless communication terminal station controls the antenna switching device 2, connects the antenna 1 to the time division multiplex communication radio device 4, and communicates with the base station using the time division multiplex communication method for a time t1, The paging channel output from the base station using the time division multiplex communication method is received. Thereafter, after the time t1 has elapsed, during the time t2 (= time t4), the hybrid wireless communication terminal station controls the antenna switcher 2 and connects the antenna 1 to the code division multiplex communication radio 3 side. Then, according to the above-described control method, the channel estimating unit 51, the channel counter 52, the memory 53, and the detection circuit 69 are operated to perform communication using the code division multiplex communication method in the vicinity of the hybrid wireless communication terminal station. Of the base station that is running.
[0081]
Then, after the elapse of time t3, the combined wireless communication terminal station controls the antenna switcher 2 again, switches the antenna 1 to the time division multiplex communication radio 4 side, and uses the time division multiplex communication system. Perform a standby operation with the base station. When the time t1 elapses and a time t5 at which the hybrid wireless communication terminal station ends receiving the paging channel with the base station using the time division multiplex communication method, the hybrid wireless communication terminal station sets the antenna switch 2 to ON. Control, the antenna 1 is connected to the code-division multiplex communication radio 3 side, and based on the counter value of the channel counter 52 stored in the memory 53, the antenna 1 is detected near the hybrid radio communication terminal station. In addition to receiving the received channel, it performs despreading of the received signal and demodulation of the received signal to determine whether the detected channel is a communicable base station.
[0082]
As described above, in this embodiment, the time division multiplex communication radio 4 for communicating with the base station using the time division multiplex communication method and the code for communicating with the base station using the code division multiplex communication method are used. In a wireless communication terminal station having the radio equipment 3 for division multiplex communication, when performing a standby operation with a base station using the time division multiplex communication method, the communication state of the base station using the code division multiplex communication method In order to realize the function of investigating the frequency band, a distributor 66 and a detection circuit 69 are provided in a portion of the code division multiplex communication radio 3 for processing a radio signal in the intermediate frequency band. , A channel counter 52, and a memory 53.
[0083]
Further, in this embodiment, the count value of the channel counter 52 is made to match the frequency number set in the frequency synthesizer 72, and the power of the detection result output from the detection circuit 69 in the channel estimation section 51 and the channel estimation section 51 hold in advance. If the output of the detection circuit 69 is larger than the threshold value, the count value of the channel counter 52 is stored in the memory 53, and code division multiplexing is performed in the vicinity of the composite wireless communication terminal station. Since the base station that is performing communication using the communication method is searched in advance, a base station that is performing communication using the code division multiplex communication method in the vicinity of the hybrid wireless communication terminal station is searched, When determining whether a base station is communicable or not, it does not perform despreading processing on the received signal in all reception channels, and can perform all reception channels in a short time. There are, it is possible to search for a base station using code division multiple access communication system in the vicinity of the complex wireless communication terminal station.
[0084]
Therefore, in the present embodiment, the wireless communication apparatus is configured by the radio equipment 3 for code division multiplex communication and the radio equipment 4 for time division multiplex communication. In addition to being able to search for a base station using the code division multiplexing method in the vicinity of the hybrid wireless communication terminal station in time, the code division multiplexing method that can communicate in a short time is used A base station can be detected.
[0085]
In the above-described embodiment of the present invention, only the parts related to the present invention in the radio equipment 3 for code division multiplex communication and the radio equipment 4 for time division multiplex communication are shown, and other detailed constituent parts are publicly known. Therefore, the description of the configuration and operation is omitted.
[0086]
【The invention's effect】
As described above, the present invention provides a time division multiplex communication radio means for communicating with a first base station using a time division multiplex communication method and a second base station using a code division multiplex communication method. In a hybrid wireless communication terminal station including a code division multiplexing communication wireless means for communicating with a station, a second terminal is used when the terminal performs a standby operation with the first base station. By investigating the communication state of the base station, it is possible to detect a base station having a good communication state from a plurality of base stations using the code division multiplex communication method within a short time without impairing portability. The effect is obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a hybrid wireless communication terminal according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a code division multiplex communication receiver of FIG.
3 is a block diagram showing a configuration of each of a code division multiplex communication baseband unit of FIG. 1 and a detection circuit of FIG. 2;
FIG. 4 is a block diagram illustrating a configuration of a control unit in FIG. 1;
FIG. 5 is a diagram showing a paging channel reception cycle received by the time division multiplex communication radio of FIG. 1 and a timing at which the code division multiplex communication radio detects a channel.
FIG. 6 is a flowchart showing the operation of the control unit in FIG. 4;
FIG. 7 is a block diagram showing a configuration of a code division multiplex communication receiver constituting a conventional code division multiplex communication radio.
FIG. 8 is a block diagram showing a configuration of a conventional code division multiplex communication baseband unit and a control unit.
[Explanation of symbols]
1 antenna
2 Antenna switch
3 Radio equipment for code division multiplex communication
4. Radio equipment for time division multiplex communication
5 control part
6 Code division multiplex communication receiver
7 Code division multiplex communication transmitter
8 Code division multiplex communication baseband unit
9 Time division multiplex communication receiver
10 Time division multiplex communication transmitter
11 Time-division multiplex communication baseband unit
12 Recording media
51 Channel estimation unit
52 channel counter
53 memory
54 Frequency Synthesizer Control Unit
55 reception data processing unit
56 transmission data generation unit
61 antenna duplexer
62 High frequency amplifier
63 First bandpass filter
64 frequency converter
65 Second band filter
66 distributor
67 Variable amplifier
68 quadrature demodulator
69 Detection circuit
70 First Local Oscillator
71 Second local oscillator
72 frequency synthesizer
81,82 First low-pass filter
83,84 First A / D converter
85 Despreading part
86 Receive digital signal processing unit
87 Transmission digital signal processing unit
88 Diffusion unit
89,90 D / A converter
91,92 Second low-pass filter
93 Second A / D converter
691 Amplifier
692 detector
693 Low pass filter

Claims (15)

A time division multiplex communication radio unit for communicating with a first base station using a time division multiplex communication system and a communication unit for communicating between a second base station using a code division multiplex communication system. A combined wireless communication terminal station including a code division multiplex communication wireless unit, wherein the communication state of the second base station when the terminal is performing a standby operation with the first base station; A hybrid wireless communication terminal station, comprising: Detecting means for detecting a received signal in the input intermediate frequency band, channel estimating means for comparing the detection result of the detecting means with a preset threshold value to manage the presence or absence of channel detection, and the channel estimating means A channel counter that counts the count value for detecting the channel based on the comparison result, and a memory that holds the count value of the channel counter when the channel is detected by comparison of the channel estimation unit. 2. The combined wireless communication terminal according to claim 1, wherein the communication state of the second base station is investigated using the detection unit, the channel estimation unit, and the channel counter. 3. The hybrid wireless communication terminal according to claim 2, wherein the detection unit is provided in a part of the code division multiplex communication wireless unit that processes a received signal in an intermediate frequency band. 4. The hybrid wireless communication terminal according to claim 2, wherein the channel estimating unit, the channel counter, and the memory are provided in a control unit of the own terminal. The frequency set in a frequency synthesizer for stabilizing the intermediate frequency band to extract a received signal in the intermediate frequency band is made to match a count value of the channel counter. 5. The hybrid wireless communication terminal station according to any one of 4. When the detection result of the detection means is larger than the threshold value, it is determined that the second base station is present near the own terminal, and the count value of the channel counter is stored in the memory. The combined wireless communication terminal station according to claim 2. Only the frequency determined as the second base station in the vicinity of the terminal based on the count value of the channel counter stored in the memory is received, and the received signal is required for the code division multiplex communication system. 7. The combined wireless communication terminal station according to claim 2, wherein the combined wireless communication terminal station performs a despreading process. A time division multiplex communication radio unit for communicating with a first base station using a time division multiplex communication system and a communication unit for communicating between a second base station using a code division multiplex communication system. A method of searching for a base station of a hybrid wireless communication terminal station including code division multiplex communication wireless means, wherein the terminal performs a standby operation with the first base station. A method for searching for a base station, comprising a step of investigating a communication state of the base station. Managing the presence or absence of channel detection by comparing the detection result of the detection means for detecting the received signal of the input intermediate frequency band with a preset threshold value, and performing the channel detection based on the comparison result. Counting a channel counter for counting the count value of the channel counter, and holding a count value of the channel counter in a memory when the channel detection is determined based on the comparison result, based on the comparison result. 9. The base station search method according to claim 8, further comprising: checking a communication state of the second base station. 10. The base station search method according to claim 9, wherein said detection means is provided in a portion of the code division multiplex communication radio means for processing a received signal in an intermediate frequency band. 11. The base station search method according to claim 9, wherein the channel counter and the memory are provided in a control unit of the own terminal, and a process of managing presence / absence of channel detection is performed by the control unit. The frequency set in a frequency synthesizer for stabilizing the intermediate frequency band for extracting a received signal in the intermediate frequency band is made to coincide with a count value of the channel counter. 12. The base station search method according to any one of items 11 to 12. When the detection result of the detection means is larger than the threshold value, it is determined that the second base station is present near the own terminal, and the count value of the channel counter is stored in the memory. The base station search method according to any one of claims 9 to 12. Only the frequency determined as the second base station near the terminal based on the count value of the channel counter stored in the memory is received, and the received signal is required for the code division multiplex communication system. 14. The base station search method according to claim 9, wherein a despreading process is performed. A time division multiplex communication radio unit for communicating with a first base station using a time division multiplex communication system and a communication unit for communicating between a second base station using a code division multiplex communication system. A program for a base station search method of a hybrid wireless communication terminal station including code division multiplex communication wireless means, wherein a detection result of a detection means for detecting a received signal of an input intermediate frequency band is preset in a computer. A process of managing the presence or absence of channel detection by comparing with the threshold value, a process of counting up a channel counter for counting a count value for the channel detection based on the comparison result, And holding a count value of the channel counter in a memory when the channel detection is determined.

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