JPH08275228A - Personal handy phone system - Google Patents

Abstract

PURPOSE: To obtain the personal handy phone system in which a control channel is set up smoothly as required. CONSTITUTION: The processing to set up a control channel is conducted for the connection to a public base station or a private master station (in-house master station). A control channel is set up by receiving required information sent at a prescribed interval with a control channel frequency from the public base station or the private master station. A microcomputer 3 revises the frequency of trial of setup of a control channel with the public base station or the private master station depending on a state of an antenna based on a detection output of a position detector 9. That is, the frequency of trial of the setup of the control channel with the public base station or the private master station is set lower when the antenna 1 is in the contained state and high when the antenna 1 is in the extracted state. When the setup of the control channel is required, the antenna 1 is extracted to increase the frequency of trial thereby smoothing the setup of the control channel and precluding remarkably the possibility of mis-reception of an incoming call.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a personal handyphone system (PHS). In detail, the frequency of trials for establishing a control channel for connecting to a public base station or a self-employed master station can be arbitrarily changed, so that the control channel can be established smoothly when necessary. It concerns a telephone.

[0002]

2. Description of the Related Art Conventionally, a simple mobile phone has been proposed from the idea that a cordless phone used at home or office can be used outdoors. When this simple type mobile phone is used outdoors, it is used by being wirelessly connected to a public base station, while when it is used indoors, it is used by being wirelessly connected to a self-employed master station (home master station). Here, the simplified mobile phone is performing a process of establishing a control channel to connect to the public base station and the self-employed master station described above.

In the control channel establishment process, the reception of information transmitted from the public base station and the self-employed master station at predetermined intervals at predetermined control channel frequencies is tried. When all the necessary information is received, this is called establishment of a control channel. Even after the control channel is established, the public base station and the self-employed master station always transmit information at regular intervals, and the control channel is being established as long as the information can be received. On the other hand, when various information cannot be received on the control channel, the control channel is repeatedly tried until the control channel is established again.

When a control channel is established with a public base station, a location registration process for further registering the public base station area is performed. This location registration processing is executed by exchanging information between the simple mobile phone and the public base station in which the control channel has been established. The position registration process is executed every time the control channel is established, unless the area is changed.

FIG. 3 shows a public base station, a self-employed master station, a microcomputer (hereinafter referred to as "microcomputer") as a system controller of a simplified mobile phone, and a simplified model in a control channel establishment process and a position registration process. An example of a communication state with a baseband IC (BBIC) for processing a protocol on the air of a mobile phone is shown.

First, the microcomputer determines whether or not the standby mode is set. When determining that the standby mode is set, the microcomputer transmits a control channel establishment request signal for establishing a control channel with the public base station to the BBIC. The BBIC that receives this performs processing for establishing a control channel with the public base station.
When the control channel is established (successfully), the BBIC transmits a control channel establishment display signal, that is, information that the control channel has been established, to the microcomputer.

If the control channel established at this time is different from the previously established area, it is necessary to perform location registration for the service area. In this case, the microcomputer sends a position registration request signal to the BBIC. The BBIC that receives the information exchanges information with the public base station and performs location registration processing. If location registration is successful, BBIC
Sends a position registration success indication signal to the microcomputer. As a result, on the center side, individual terminals (simple mobile phones)
It is possible to know which public base station the service area is in and to notify the incoming call.

Further, the microcomputer transmits to the BBIC a control channel establishment request signal for establishing a control channel with the self-employed base station. Upon receiving this, the BBIC performs processing for establishing a control channel with the self-employed master station. And
Once the control channel is established (successful), BB
The IC sends a control channel establishment display signal to the microcomputer.

After the control channels are established with the public base station and the self-employed master station in this way, the control channels are in a standby state. As described above, the establishment of the control channel is independently performed for both the public base station and the self-employed master station. Therefore, even if the control channel with the public base station is established, if the control channel with the self-employed master station is not established, the process for establishing the control channel with the self-employed master station is always tried at regular intervals. . The same applies to the opposite case.

[0010]

As described above, in the simple type portable telephone, the control channel establishing process for the public base station and the self-employed master station is always tried at a constant interval until the control channel is established. Therefore, for example, if an attempt is made to establish the control channel once immediately before entering the service area of the public base station, even if the service area is immediately entered after that, the call can actually be received only after a predetermined time. Therefore, in the meantime, there may be a case that the chance of receiving an incoming call is missed.

In view of this, the present invention provides a simple portable telephone in which a control channel can be smoothly established when necessary.

[0012]

SUMMARY OF THE INVENTION A simple type portable telephone according to the present invention is a simple type portable telephone for performing a control channel establishing process for connecting to a public base station and a self-employed master station. A change operation means for changing the frequency and a trial frequency control means for controlling the trial frequency of establishing the control channel according to the operation of the change operation means are provided.

[0013]

The frequency of trials for establishing the control channel is controlled by operating the changing operation means. This makes it possible to increase the frequency of trials for establishing the control channel by operating the change operation means. For example, when the retractable antenna is also used as the change operation means, the control channel is controlled so that the frequency of trials for establishing the control channel increases when the antenna is pulled out.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention will be described below with reference to FIG.
Examples will be described. This example is a simple mobile phone (P
This is an example applied to HS (Personal Handyphone System).

The simplified mobile phone of this embodiment has a radio section 2 for performing radio communication with a base station, a digital modulation / demodulation section 3 for performing modulation and demodulation processing of π / 4 shift QPSK, and a plurality of channels. A Time Division Multiple Access (TDMA) processing unit 4 for handling multiplexed signals in slots, a voice codec unit 5 for performing compression encoding and decoding of voice signals, and a micro as a system controller. It has a computer (hereinafter referred to as “microcomputer”) 8. The wireless unit 2 is provided with the above-described baseband IC (BBIC) for performing control channel establishment processing and location registration processing, which is interposed between the microcomputer 8 and a public base station or a self-employed master station ( (See FIG. 3).

The signal from the base station received by the antenna 1 is supplied to the digital modulation / demodulation unit 3 via the radio unit 2 and subjected to π / 4 shift QPSK demodulation processing. The signal demodulated by the digital modulation / demodulation unit 3, that is, the time division multiplexed signal of slots for a plurality of channels is supplied to the TDMA processing unit 4. In the TDMA processing unit 4, under the control of the microcomputer 8, a preset slot is selected from a multiplexed signal of slots for a plurality of channels, and compressed audio data and control data are separated from the selected slot.

The control data output from the TDMA processing unit 4 is supplied to the microcomputer 8. In addition, the TDMA processing unit 4
The compressed audio data output by the above is supplied to the audio codec section 5 and subjected to decoding processing (including error correction processing) and then converted into an analog signal. Then, the received voice signal output from the voice codec section 5 is supplied to the speaker 6 which constitutes the handset.

Further, the transmission voice signal output from the microphone 7 constituting the transmitter is supplied to the voice codec section 5 and subjected to compression coding processing (including error correction coding processing), and then TDMA processing section. 4 is supplied. TDMA
In the processing unit 4, the compressed audio data supplied from the audio codec unit 5 is time-division multiplexed as a preset slot. In this case, the control data output from the microcomputer 8 is also multiplexed in that slot. TDMA
The signal multiplexed by the processing unit 4 is supplied to the digital modulation / demodulation unit 3 and subjected to π / 4 shift QPSK modulation processing. The modulated signal output from the digital modulation / demodulation unit 3 is supplied to the antenna 1 via the wireless unit 2 and transmitted to the base station.

Even if not mentioned above, when entering the area of a predetermined public base station in a power-on state, necessary information transmitted from the public base station at a constant interval with a control channel frequency for the public base station is transmitted. A control channel is established by receiving all the information, and then wireless communication is performed with the public base station to perform location registration that the user is in the area of the public base station. When you enter the area of a self-employed master station (home master station) in the power-on state, you must receive all the necessary information that is sent from the self-employed master station at a fixed interval using the control channel frequency for the self-employed master station. The control channel is established at. It should be noted that at the time of reception for establishing the control channel, the power consumption is several times that of the normal time. For example, the current consumption at the normal time is about 30 mA, whereas the current consumption at the time of reception for establishing the control channel is about 100 mA.

Further, in the simple type portable telephone of this example, the microcomputer 8 outputs a ringing tone output section 11 for outputting a ringing tone, a numeric keypad for inputting a telephone number and the like, a special input key, and various operation modes. Key input unit 12 including a stop key for forcibly returning to standby mode, a call key 13 for changing from an on-hook state to an off-hook state or vice versa, a system state, and the other party's side when making a call. A display unit 14 for displaying a telephone number or the like is connected.

Although not described above, the antenna 1 has a retractable structure. FIG. 2A shows a state when stored, and FIG. 2B shows a state when pulled out. In addition, 20 has shown the telephone body. In FIG. 1, the position detector 9 is configured to have a mechanical switch or the like, and the position detector 9 detects whether the antenna 1 is in the housed state or in the pulled out state. The detection output of the position detector 9 is supplied to the microcomputer 8.

In the above configuration, the telephone number of the other party is input by the key operation of the key input unit 12 and then the call key 13
When is pressed, first, the telephone number data or the like is supplied as control data from the microcomputer 8 to the TDMA processing unit 4 and transmitted to the base station through the control channel. As a result, a line connection is established with the other party and a call is possible.

Here, the call is performed using the call channel, but during the line connection process, the control channel is used to transmit the communication frequency and slot position data of the call channel from the base station as control data to perform the TDMA process. It is supplied from the unit 4 to the microcomputer 8. The microcomputer 8 controls the radio unit 2 based on the communication frequency data so that the transmission / reception frequency matches the communication frequency of the communication channel, and sets the slot selected by the TDMA processing unit 4 based on the slot position data. To do. Therefore, the call is made using the call channel notified from the public base station or the self-employed master station.

Further, when the base station transmits call data as control data using the control channel, and the call data is supplied from the TDMA processing section 4 to the microcomputer 8 and an incoming call is detected, the microcomputer 8 issues a ring tone. Output unit 11
Is controlled to output the ringing tone. When a response is made by pressing the call key 13 while the calling operation is being performed, the response data is supplied from the microcomputer 8 to the TDMA processing unit 4 as control data and transmitted to the base station through the control channel. As a result, a line connection is established with the other party and a call is possible. Also in this case, the call is made using the call channel notified from the base station. As described above, the control channel is used when call data is transmitted from the base station as control data. Since the call data has identification data such as telephone number data, the microcomputer 8 You can recognize that this is the call data for yourself.

Although not described above, in a state where the control channel has not been established, trials of establishing the control channel with the public base station or the self-employed base station are repeatedly performed. In this example, the frequency of trials for establishing a control channel with a public base station or a self-employed master station is based on the detection output of the position detector 9,
It changes according to the state of. That is, the frequency of trials for establishing a control channel with the public base station or the self-employed master station is lowered when the antenna 1 is in the housed state as shown in FIG. 2A, and the antenna 1 is pulled out as shown in FIG. It is raised when in a state.

As described above, according to this example, when the antenna 1 is in the pulled-out state, the frequency of trials for establishing the control channel with the public base station or the self-employed master station is increased. It is possible to smoothly establish the control channel with the base station and the self-employed parent station,
The risk of missing an incoming call can be greatly reduced. Therefore, it is very effective for waiting when the user knows that the telephone is coming. Further, since the antenna 1 is also used as the change operation means, the complexity of the operation panel can be reduced as compared with the case where an operation switch dedicated to changing the trial frequency is provided.

In the above embodiment, the antenna 1
Although the frequency of trials for establishing the control channel is changed according to the above state, an operation switch or the like for changing the trial frequency may be separately provided. Further, the trial frequency may be changed in multiple stages instead of two stages.

[0028]

According to the present invention, the frequency of trials for establishing a control channel for connecting to a public base station or a self-employed master station can be arbitrarily changed by operating the changing operation means. Therefore, it is necessary to establish the control channel. In such cases, the control channel can be established smoothly by increasing the frequency of trials, and the risk of missing an incoming call can be greatly reduced. Further, by using the retractable antenna also as the changing operation means, the complexity of the operation panel can be reduced as compared with the case where an operation switch dedicated to changing the trial frequency is provided.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a telephone according to the present invention.

FIG. 2 is a diagram showing a state of an antenna.

FIG. 3 is a diagram showing an example of communication states for control channel establishment processing and location registration processing.

[Explanation of symbols]

 1 Antenna 2 Radio Section 3 Digital Modulation / Demodulation Section 4 TDMA Processing Section 5 Voice Codec Section 6 Speaker 7 Microphone 8 Microcomputer 9 Position Detector 11 Ringer Output Section 12 Key Input Section 13 Call Key 14 Display Section

Claims (2)

[Claims] 1. A simple mobile phone for performing a control channel establishment process for connecting to a public base station and a self-employed master station, and a change operation means for changing the frequency of trials for establishing the control channel, and the change described above. And a trial frequency control means for controlling the trial frequency for establishing the control channel according to the operation of the operation means. 2. The simple mobile phone according to claim 1, further comprising a retractable antenna, wherein the retractable antenna is also used as the changing operation means.