JPH10224843A - Mobile station equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a common use mobile station for a personal handy phone system(PHS) and a cellular portable telephone set to detect a high speed movement of a mobile station equipment so as to select a cellular operation automatically. SOLUTION: A fading pitch monitor means 3 uses a comparator 5 to compare reception level data with threshold level data and uses a counter 6 initialized periodically with a resulting binary signal to count an output of the comparator 5. When an interval crossing the threshold level is short, that is, fading pitch is increased, a carry signal is outputted, then a system changeover control means 8 outputs a system changeover request signal thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a mobile station apparatus.

[0002]

2. Description of the Related Art Small cell-type mobile phones are steadily increasing the number of subscribers because they have a wide service area and are compatible with high-speed movement. On the other hand, simple mobile phones that can be used outdoors by expanding the range of use of conventional cordless phones are low-cost calls, mainly for spot-like use around stations, downtown, underground shopping malls, inside buildings, along highways, etc. The number of subscribers has been increased by taking advantage of the charge and the communication function between slave units (so-called transceiver function).

[0003] Since the structure of a base station of a simple portable telephone is simpler than that of a portable telephone, the installation cost may be lower. Therefore, the base station is installed even in a building or an underground mall where radio waves cannot reach with a conventional small cell type portable telephone. It is available. On the other hand, with regard to channel switching due to movement between base stations, speed limitations and restrictions on a wide area network including an exchange are large for mobile phones, and they cannot be used during high speed and wide area movement such as a Shinkansen. (It is possible to use a mobile phone.) Therefore, it is desirable to use a mobile phone and a simple mobile phone properly depending on the use environment, and it is convenient if there is a mobile station that can be shared by both systems.

For a mobile station apparatus that can be shared by two systems, it is necessary to determine an available situation and select an optimal system. It is troublesome for the user to always switch consciously, and it is desirable to be automated. With respect to such a technique, switching between different cellular systems is disclosed in Japanese Patent Publication No. Hei 7-44728.
This means that if there is no service in one system for a given period of time (i.e., if a control channel above a certain power level cannot be supplemented), the program will start operating in the other system in a way that responds to the interrupt. Is controlled to be

[0005]

The disclosed technique can be used for both a portable telephone and a simple portable telephone. But,
When shared with a simple portable telephone, it is necessary to further consider the moving speed of the mobile station device. When the mobile station repeatedly moves and stops at high speed in a narrow manner, for example, in a delivery operation by car, the use of a simple mobile phone is frequently replaced even in a service area, and a switching operation frequently occurs. In such a situation, it is not wise to have an incoming call on a simple mobile phone. Rather, it is desirable that the user waits for an incoming call using a mobile phone. There has been no disclosure of an automatic switching technology that responds to the dynamic change of the moving speed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a system common to two systems for automatically selecting an operation on a mobile phone from a simple mobile phone in response to a change in the moving speed of a mobile station, that is, when a high-speed movement occurs. It is to provide a possible mobile station device.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a mobile station control means for switching an operating system to a mobile station apparatus which can be shared by a portable telephone system and a simple portable telephone system. And the reception level,
Fading pitch monitoring means for monitoring a notch-like drop in the reception level, detecting pitch data proportional to the fading pitch that is the average period, and outputting a notification signal when the pitch data exceeds a predetermined value, A system switching control means for issuing a system switching request signal to the mobile station control means when receiving the broadcast signal is provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating the configuration of the embodiment.
In FIG. 1, reference numeral 1a denotes a mobile station high-frequency circuit for a simple portable telephone (hereinafter, PHS telephone), and 1b denotes a high-frequency circuit for a cellular portable telephone (hereinafter, cellular telephone). 2 is a changeover switch,
3 is a fading pitch monitoring means, 4 is an A / D converter, 5 is a comparator, 6 is a counter, 7 is a timer for initializing the counter 6, 8 is a system switching control means, and 9 is a baseband processing circuit. Control means. 10
Is a ringer, 11 is a receiver, 12 is a microphone, 13 is a display circuit, and 14 is a key input unit.

First, the overall configuration will be described. 1a-1
A mobile station device that can be used by both the cellular telephone and the PHS telephone is composed of the components of the fourth embodiment. The two systems are
Since the operating frequency and the transmission rate of the digital modulation signal are different, a high frequency circuit dedicated to each system having a different antenna length and a different filter band is provided. This high frequency circuit 1a,
1b are connected to the baseband processing circuit 9, respectively. Then, data to be transmitted is input from the baseband processing circuit 9, the radio signal is modulated and amplified in the air, and the data is demodulated from the received radio signal and output to the baseband signal processing circuit 9.

The baseband processing circuit 9 decodes the received data and assembles the transmitted data, and controls the operation of the mobile station according to a command on the system side based on the received data and a user operation input via the key input unit 14. Oversee.

[0011] The received voice data is decoded to output the received voice to the receiver 11, and the transmission voice input from the microphone is encoded to enable a telephone conversation. Further, at the time of calling at the time of an incoming call, the ringer 10 is sounded, and a display to the user is output to the display circuit 13.

That is, the basic configuration of the mobile station according to the present embodiment is as follows.
The system includes two high-frequency circuits 1a and 1b that are compatible with two systems having different physical conditions for common use, and a baseband processing circuit 9 that is in charge of logical processing for terminal control and interface processing with a user.

Next, a characteristic configuration of the present invention will be described. First, the fading pitch monitoring means 3 comprises an A / D converter 4, a comparator 5, a counter 6, and a timer 7 as follows. Each of the high-frequency circuits 1 a and 1 b outputs a reception level signal, and inputs one of the signals to an A / D converter 4, which is an internal circuit of the fading pitch monitoring unit 3, via a changeover switch 2.

The reception level signal is, for example, an automatic gain control signal of logarithmic amplification performed in a second intermediate frequency stage of a double super receiver, and indicates a reception level from a gain necessary for amplifying the reception signal to a saturation level. Is converted so that it can be performed.

The reception level is treated as a digital value sampled inside the fading pitch monitoring means 3. The sampling speed is a value set from the expected maximum speed of the mobile station so that a drop period described later is observed.

The sampled reception level data is input to one input of a comparator 5, a system switching control means 8, and further to a baseband processing circuit 9. The other input of the comparator 5 is threshold level data output from the system switching control means 8. The comparator 5 constantly compares the reception level data with the threshold level data, and outputs a binary signal of 1 level if the reception level is high, and a 0 level if the reception level is high. The binary signal is used as a clock signal of the binary counter 6 of a predetermined bit. In this embodiment, the counting operation is performed at the rising edge of the binary signal. That is, the counter 6 once counts down each time the reception level drops below the threshold level and again exceeds the threshold level. The counter 6 is connected so as to be repeatedly initialized at a predetermined cycle determined by the timer 7. Then, a carry signal when the counter 6 overflows is output to the system switching control means 8.

As described above, the fading pitch monitoring means 3 receives the reception level and the threshold data from the system switching control means 8 and outputs a carry signal as a notification signal.

Next, the system switching control means 8 further receives the status data of the mobile station from the baseband processing circuit 9 and issues a system switching request signal based on the status data and the carry signal. Input to the band processing circuit 8.

Next, a description will be given of a mechanism according to the present embodiment in response to a dynamic change in the moving speed of the mobile station apparatus. In mobile communication, the path between a transmitter and a receiver, which is a propagation path of radio waves, is out of sight, and a multipath propagation path is formed by reflection, diffraction, and scattered waves. When moving at a high speed in an environment on a standing wave where such multipath signals are combined, the received signal undergoes severe level fluctuation and phase fluctuation accompanying the movement. This is called fading. FIG. 4 shows an example of a received signal envelope amplitude due to Rayleigh fading when the delay time difference between multipaths is small.

As shown in FIG. 4, a sharp drop on the notch is observed. This drop period is called a fading pitch, and is proportional to the traveling speed of the mobile station and inversely proportional to the wavelength of the reception frequency.

[0021]

(Equation 1)

Therefore, if it is determined that the PHS telephone system cannot follow this drop cycle, it is sufficient to issue a switching request to the cellular telephone system.

In this embodiment, the fading pitch monitoring means 3 constantly counts the number of times the reception level crosses the threshold value upward, and the counter 6 overflows earlier than a predetermined reset cycle, so that a certain fading pitch or more is obtained. It is determined that the speed has been reached. Here, the threshold data is a value calculated and set by the system switching means 8.

Next, the threshold data will be described. FIG.
FIG. 6 is a flowchart for setting a threshold value of the system switching control means. 20 to 23 indicate processing steps, respectively.

The system switching control means 8 is realized by, for example, a CPU system (not shown) and a program. When the system switching control means 8 starts operation, first, the threshold data is set to 0 (step 20). At this stage, since the output of the comparator 5 is fixed at one level, the counter 6 does not count.

Next, an average reception level Rn is calculated from a predetermined number of samples in the short section n of the reception level data (step 21). Further, a moving average Rth of Rn is obtained from the past K + 1 calculation results of Rn (step 22), and this is set as a threshold value for the fading pitch monitoring means 3. Hereinafter, steps 21 to 23 are repeated.

As a result, the threshold value changes according to a gradual change in the reception level. The fading pitch monitoring means 3 can detect a fast pitch irrespective of the average strength of the reception level by dynamically changing the threshold data for a change that is much slower than the fading fluctuation serving as a reference for system switching. To As the short section length and the moving average length, for example, a length that can follow a fluctuation of 5 Hz or less is selected.

At this time, assuming that the limit when the system following speed of the PHS telephone is converted into the fading pitch is, for example, about 10 Hz in this embodiment, the reset interval period of the timer 7 is 1.6 seconds, and the counter 6 is reset. It is sufficient to select 4 bits.

Next, a procedure for issuing a system switching request signal will be described.

In this embodiment, the system switching control means 8
The mobile station status data includes information as to which system is currently operating, whether it is in standby reception, and whether the user has enabled automatic switching.

At this time, the system switching control means 8 executes the program of the flowchart shown in FIG. 3 as the interrupt processing started by the input of the carry signal. Reference numerals 30 to 34 in FIG. 3 indicate respective processing steps.

When the system switching control means 8 detects the carry signal, the system switching control means 8 starts the interruption processing of reference numeral 30. This is to issue a system switching request only when the mobile station is in standby reception, is currently operating as a PHS telephone, and the user has enabled automatic switching, and one of the conditions is missing. In this case, the process returns from the interrupt process without issuing a request. That is, in this embodiment, even if high-speed movement is detected, this is continued during a call in the PHS mode.

The baseband processing circuit 9, which has received the system switching request signal, controls each circuit and switches the mode of the mobile station so that the operation of the cellular telephone is performed from the PHS telephone.

[0034]

According to the present invention, when the mobile station apparatus starts moving at a high speed exceeding the standard, this is detected and the operation of the mobile station is automatically changed from a simple portable telephone (PHS telephone) to a cellular portable telephone. , A highly convenient shared mobile station for two systems can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart for setting a threshold value of the system switching control means.

FIG. 3 is a flowchart of interrupt processing by a carry signal of a system switching control unit.

FIG. 4 is a characteristic diagram of a fluctuation of a reception envelope amplitude due to Rayleigh fading.

[Explanation of symbols]

 1a: mobile station high-frequency circuit, 1b: mobile station high-frequency circuit, 2: changeover switch, 3, fading pitch monitoring means, 4, A / D converter, 5, comparator, 6 counter, 7 timer, 8 system switching Control means, 9: Baseband processing circuit, 10: Ringer, 11: Receiver, 12: Timer, 13: Display circuit, 14: Key input unit.

Claims (4)

[Claims] A mobile station apparatus shared between two different systems, a cellular mobile phone system of an automobile telephone system and a simple mobile phone system having a smaller cell radius and a smaller transmission output. The received reception level in operation is input, and from the fluctuation of the reception level due to fading, the pitch data of the notch-like sudden drop interval of the reception level that periodically appears is detected, and the pitch data exceeds a predetermined value. A fading pitch monitoring means for outputting a broadcast signal in the case; a system switching control means for issuing a system switching request signal for receiving the broadcast signal; and receiving the system switching request signal and switching an operating system of the mobile station. A mobile station device comprising mobile station control means. 2. A fading pitch monitoring means comprising: an analog / digital converter for sampling a reception level; a comparator for comparing the sampled reception level with a predetermined threshold; and a count based on an output of the comparator. 2. The mobile station apparatus according to claim 1, further comprising a counter for performing an operation, and a timer for initializing the counter at a predetermined cycle, and having the carry signal output when the counter overflows as the broadcast signal. 3. The system switching control means inputs a sampled reception level, and calculates an average value of the short section,
3. The mobile station apparatus according to claim 2, further comprising calculating a moving average of short-range average values, and outputting a result of the moving average as a threshold value to the fading pitch monitoring means. 4. The system switching control unit receives the notification signal, further receives a standby message on the portable cellular phone system, and receives a system switching request signal only when the user has enabled automatic switching. The mobile station device according to claim 1, 2 or 3, which issues the following.