JP2001102978A - Mobile station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure incoming call in a mobile station used for a system which performs intermittent reception in standby mode and continuous reception when a line is established. SOLUTION: In this mobile station which is connected to a base station through a radio line and used for a system receiving the signal from the base station intermittently in standby mode and continuously when a line is established, it is equipped with a 1st reception system which receives the signal from the base station, a 2nd reception system which receives the signal from the base station, a detecting means which detects the standby state or line establishment, and a setting means which makes settings so that a high-frequency receive signal of better quality between the quality of reception by the 1st reception system and the quality of reception by the 2nd reception system is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile station connected to a base station via a radio line, and receives signals from the base station intermittently in a standby state and continuously in a line established state. It relates to a receiving system, for example a mobile station used in a CDMA system.

[0002]

2. Description of the Related Art In a radio station, two antennas and a receiving system connected thereto are provided in order to improve the reception quality, and a selection diversity system for selecting the one with the higher reception quality has already been implemented. I have. Further, there is a switching diversity system in which when the reception quality of the selected receiving system is deteriorated, the receiving system is switched to the non-selected receiving system.

FIG. 6 is a diagram showing a radio unit when a conventional diversity system is adopted. A transmitting unit 100 is connected to an antenna 104 via a switch 102. On the other hand, the receiving unit Rx106 is connected to the switch 108. Then, the switch 10 is selected by the transmission / reception selection signal.
When the antenna selection signal is supplied to the switch 108 in a state where 2 is switched to the receiving unit, the receiving unit 106 is connected to either the antenna 104 or the antenna 110. The receiving unit 106 includes a band-pass filter 112 for passing the received high-frequency signal only in a desired frequency band, an amplifier 114 for amplifying the passed signal,
A band-pass filter 116 for removing harmonic components from the amplified output signal, and a local signal generator 12
It is composed of a mixer 118 that combines the local signal from 0 to drop it into an intermediate frequency signal.

In any of the diversity systems, the reception quality of the reception system is measured, and one of the reception systems is selected based on the result. In this switching, a switching instruction signal is controlled. Ideally, when the signal is output from the unit, the receiving system switches at the same time as the output of the switching instruction signal,
In reality, a transient response phenomenon occurs in which the receiving system is switched with a predetermined time delay after the switching instruction signal is output.

[0005] Therefore, the FD for continuously receiving signals
In the MA system, this transient response phenomenon cannot be received and demodulated, which is not preferable. In contrast, in the TDMA system that receives signals intermittently, the reception quality evaluation and the reception system evaluation are performed during the non-receiving period. After switching,
During the reception period, the phenomenon of the transient response can be prevented from affecting. On the other hand, in a CDMA system that receives intermittently during standby and continuously receives during a call (when a line is established), if the above-described selection diversity or switching diversity is employed, a transient response phenomenon that occurs during switching when the line is established. There is a problem that reception loss occurs due to the above.

[0006] Also, since the mobile station is driven by a battery,
In order to reduce power consumption as much as possible, there has been a demand for resting a non-selected receiving system by adopting selection diversity or switching diversity.

[0007]

SUMMARY OF THE INVENTION As described above, there has been a demand for ensuring incoming calls in a standby state. There is also a demand for ensuring despread demodulation in a call state in which a line is established. An object of the present invention is to provide a mobile station that can reliably receive an incoming call and can reliably perform demodulation at the time of reception in order to realize such a demand.

[0008]

According to a first aspect of the present invention, there is provided a mobile station connected to a base station via a radio line, which intermittently receives a signal from the base station in a standby state, and In a mobile station used for a system that receives signals continuously in an established state, a first receiving system that receives a signal from the base station, a second receiving system that receives a signal from the base station, Detection means for detecting either the state or the line establishment state, and when the standby state is detected by the detection means, the reception quality received by the first reception system and the reception quality received by the second reception system Among the reception qualities, set to select a high-frequency reception signal with good quality,
When the line establishment state is detected, a setting unit is provided for setting the signal received by the first receiving system and the signal received by the second receiving system to be combined.

A second aspect of the present invention is a mobile station connected to a base station via a wireless line, wherein the mobile station receives a signal from the base station intermittently in a standby state and continuously receives a signal in a line established state. In a mobile station used for a receiving system, a first receiving system for receiving a signal from the base station, a second receiving system for receiving a signal from the base station, and the standby state or the line establishment state Detecting means for detecting any one of the following; and when the standby state is detected by the detecting means, the reception quality received by the first reception system and the reception quality received by the second reception system are good. Setting means for setting so as to select a high-frequency reception signal having quality and, when the line establishment is detected, setting to select only the high-frequency signal received by the first reception system. .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a high-frequency unit and an intermediate-frequency unit of a transmitting unit and a receiving unit of a mobile station according to the present invention. Since the transmitting unit is not directly related to the present invention, the transmitting unit is represented as a transmitting unit 10. The transmitting unit is converted into a high-frequency signal for transmission based on the local signal. The converted high-frequency signal is input to the duplexer 14, and 16 transmitted.

On the other hand, in the receiving system, a first receiving system connected to the antenna 16 and a second receiving system connected to the antenna 26 are provided. Describing the first receiving system, the duplexer 14 extracts only a signal in a desired frequency band from signals received by the antenna 16. The output of the duplexer 14 is connected to the LNA 18 and amplified. LNA
A band-pass filter 20 is connected to remove unnecessary frequency band components from among the outputs of the 18. The output of bandpass filter 20 is provided to the plus input of mixer 40.

As for the second receiving system, a band-pass filter 28 is provided to extract only a signal in a desired frequency band from signals received by the antenna 26.
The output of the bandpass filter 28 is connected to the LNA 30 and amplified. A bandpass filter 32 is provided to remove unnecessary frequency band components from the output. The output of the band-pass filter 32 is delayed by a predetermined time or more (a time longer than the unit chip time of the spread code and capable of despreading) with respect to the arrival time of the received signal in the first reception system. In order to
Is connected. The output of the delay unit 34 is connected to the minus input of the mixer 40.

The mixer 40 generates an intermediate frequency signal by mixing with a local signal. An unnecessary frequency component generated at the same time is removed by the IF filter 42. As a result, a desired intermediate frequency signal component as an output of the IF filter 42 is input to the subsequent reception IF unit.

In the above configuration, the mixer 40 is originally provided with a configuration in which a new combining unit is not required as a unit for combining the signal of the first receiving system and the signal of the second receiving system. Two differential inputs were used.

In FIG. 1, a control unit 60 is provided, and outputs to the switch 62 a signal indicating whether or not the mobile station according to the present invention is in a standby state. When the switch 62 recognizes the state shown in the drawing based on this signal, that is, the standby state, the control unit 60 selects one of the first and second reception systems having the better reception quality so as to select only the reception system having better reception quality. An instruction signal is output. This is because the instruction signal to the switch 50 for supplying power to the LNA of the first receiving system and the instruction signal to the switch 52 for supplying power to the LNA of the second receiving system are inverted. As described above, this is realized by providing the inverter 64.

With this configuration, when the control unit 60 recognizes the standby state of the mobile station, it performs selection diversity control. In response to the antenna selection signal, only one of the LNAs in the receiving system is set to the active state, and power is not supplied to the other, so that the LNA is set to the inactive state. By doing so, the reception system with the better reception quality waits, so that the effect of ensuring the incoming call and the power supply to the LNA of the reception system that is not selected are cut off to reduce the power consumption. There is also a saving effect.

FIG. 2 shows the case of intermittent reception during standby.
FIG. 4 is a diagram illustrating a state of antenna switching, in which a time for detecting a reception level of each of a first reception system and a second reception system is provided, and a better reception quality is selected. In the figure, the first system is selected in the reception slot (1), and the second system is selected in the reception slot (2). Returning to FIG. 1, when the control unit 60 recognizes that a line has been established with the base station, when the line is established as in a CDMA system, for example, a signal from the base station is continuously transmitted. In such a system, the fact is supplied to the switch 62, so that the switch 62 connects the control unit 60 to a side other than the illustrated state. In this state, the power is supplied to any of the LNAs by constantly outputting an active signal from the control unit 60. In this way, the signals received by the respective receiving systems are combined by the mixer 40. Therefore, when the line is established, that is, when signals from the base station are continuously received, combining diversity control is performed instead of selection diversity control for selecting one of the two receiving systems. Therefore, it is possible to eliminate the disconnection of the reception due to the transient response at the time of switching of the receiving system, and to take advantage of the combination of the two antennas.

[0018] In addition, there is an advantage that the attenuation of the demodulation of the received signal can be compensated by combining the two received signals in the line established state. In FIG. 1, two differential inputs of the mixer 40 are used as a method of synthesizing two signals. However, the present invention is not limited to this. As shown in FIG. May be used. In this case, a mixer is required as the components 70 and 72 provided in the respective receiving systems. Even in such a case, the synthesizing means for synthesizing the two signals is the IF filter 42.
Does not need to be newly provided, and the circuit scale can be kept small.

As an example of combining two signals, a differential input of a mixer and a differential input of an IF filter have been described. As shown in FIG. 4, a BA is newly added as a synthesizer.
The LUN 80 is connected to the band-pass filters 20, 32 and the mixer 4
0 may be provided. In the above description, an example in which the selection diversity control is performed when the standby state is detected has been described. However, the switching diversity control may be performed. (Second Embodiment) In the first embodiment, an example of control for performing combining diversity after a line has been established has been described. However, the present invention is not limited to this. Of the systems, only one of the receiving systems may be kept in an active state, and FIG. 5 shows this.

The difference from FIG. 1 is that only the output of the switch 62 when the line is established is supplied to the switch 50.
The two points are that the signal is not supplied to the switch 52 and that the second receiving system is not used for combining, so that a delay unit required for combining is not required.
By doing so, in a state where the line is established, only the LNA 18 to which the power Vcc is supplied via the switch 50 becomes active, and the power is not supplied to the other LNA 30. Although the effect of synthesizing the form cannot be obtained, there is an advantage that power can be saved more.

[0021]

As described above, according to the first invention of the present application, a mobile station connected to a base station via a radio line, and intermittently receives a signal from the base station in a standby state. When a standby state is detected in a mobile station used for a system that continuously receives signals in a line established state, when a standby state is detected, the reception quality received by the first reception system and the reception quality received by the second reception system are determined. Setting to select a high-frequency reception signal having good quality, and setting to combine a signal received by the first reception system and a signal received by the second reception system when a line establishment state is detected. Since there is provided a setting means for performing the setting, there is an advantage that it is possible to secure the incoming call in the standby state and to compensate for the demodulation attenuation of the received signal by combining two received signals in the line established state.

In the second invention, the mobile station used in the same system as the first invention performs the same setting as in the first invention when a standby state is detected, but sets the line establishment state. By setting to select only the high-frequency signal received by the first receiving system when it is detected,
The power supply in the line established state can be saved more than in the first aspect.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a mobile station according to a first embodiment of the present invention.

FIG. 2 is a timing chart showing control during standby according to the embodiment of the present invention;

FIG. 3 is a block diagram showing another example of signal synthesis in the embodiment of the present invention.

FIG. 4 is a block diagram showing still another example of signal combining according to the embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a mobile station according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a conventional mobile station.

[Explanation of symbols]

 18, 30 ... LNA 50, 52 ... switch 60 ... control unit 62 ... switch

Claims (2)

[Claims] 1. A mobile station connected to a base station via a wireless line, wherein the mobile station receives signals from the base station intermittently in a standby state and continuously receives signals in a line established state. In the mobile station, a first receiving system for receiving a signal from the base station, a second receiving system for receiving a signal from the base station, and detecting either the standby state or the line establishment state Detecting means for detecting, when the standby state is detected by the detecting means, a high-frequency reception signal having good quality among the reception quality received by the first reception system and the reception quality received by the second reception system; Setting means for setting so as to select and, when detecting the line establishment state, setting to combine the signal received by the first receiving system and the signal received by the second receiving system. Characterized by Mobile station. 2. A mobile station connected to a base station via a wireless line, wherein the mobile station receives signals from the base station intermittently in a standby state and continuously receives signals in a line established state. In the mobile station, a first receiving system for receiving a signal from the base station, a second receiving system for receiving a signal from the base station, and detecting either the standby state or the line establishment state Detecting means, when the standby state is detected by the detecting means, a high-frequency reception signal having good quality among the reception quality received by the first reception system and the reception quality received by the second reception system. A mobile station comprising: a setting unit configured to select the high-frequency signal received by the first reception system when the establishment of the line is detected.