JP3482726B2 - Simple mobile phone - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple portable telephone (PHS: Personal Handyphone System). For details, a simplified mobile phone that allows the control channel to be established smoothly when necessary by enabling the frequency of attempts to establish a control channel to connect to a public base station or a privately owned parent station to be changed arbitrarily. It relates to a telephone. 2. Description of the Related Art Conventionally, a simplified portable telephone has been proposed from the idea that a cordless telephone used at home or office can be used outdoors. When the portable cellular phone is used outdoors, it is used by being wirelessly connected to a public base station, and when used indoors, it is used by being wirelessly connected to a self-owned master station (home station). Here, the simplified mobile phone performs a process of establishing a control channel in order to connect to the above-described public base station and self-owned parent station. In the control channel establishment process, an attempt is made to receive information transmitted from the public base station and the private parent station at predetermined intervals at predetermined control channel frequencies. When all the necessary information has been received, this is called establishment of a control channel. Even after the control channel is established, information is always transmitted at regular intervals from the public base station and the private parent station, and the control channel is being established as long as it can be received. On the other hand, when various kinds of information cannot be received on the control channel, the control channel is repeatedly attempted to be established until the control channel is established again. [0004] When a control channel is established with a public base station, a location registration process for registering which public base station is in which area is performed. This location registration process is executed by exchanging information between the simplified portable telephone and the public base station where the control channel has been established. The location registration process is executed every time a control channel is established, except when there is no change in the area. [0005] FIG. 3 shows a control base station, a private base station, a microcomputer as a system controller of a simple portable telephone (hereinafter referred to as a "microcomputer"), and a simple type in a control channel establishment process and a location registration process. 3 shows an example of a communication state with a baseband IC (BBIC) for processing a protocol on the air of a mobile phone. First, the microcomputer determines whether or not a standby mode is set. When it is determined 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 has received 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 indication signal to the microcomputer, that is, information that the control channel has been established. If the control channel established at this time is different from the area established last time, it is necessary to perform location registration for the service area. In this case, the microcomputer transmits a position registration request signal to the BBIC. The BBIC receiving this exchanges information with the public base station and performs location registration processing. If the location registration is successful, BBIC
Sends a location registration success indication signal to the microcomputer. Thus, on the center side, individual terminals (simple mobile phones)
Can know which public base station is in the service area, and can notify an incoming call. [0008] Further, the microcomputer transmits a control channel establishment request signal for establishing a control channel with the private base station to the BBIC. The BBIC receiving this process performs a process for establishing a control channel with the own parent station. And
When the control channel is established (successfully), BB
The IC transmits a control channel establishment indication signal to the microcomputer. [0009] After the control channels are established with the public base station and the self-owned parent station, the mobile station enters a standby state on each control channel. As described above, the control channel is established independently and independently for both the public base station and the independent parent station. Therefore, even if the control channel with the public base station is established, if the control channel with the private parent station is not established, the processing for establishing the control channel with the private parent station is always tried at regular intervals. . The same is true for the opposite case. [0010] As described above, in the simple type portable telephone, the process of establishing the control channel for the public base station and the self-owned parent station is always performed at regular intervals until the control channel is established. Try. 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, it becomes possible to actually receive a call after a predetermined time even if the user immediately enters the service area. Therefore, inconvenience may occur that a chance of receiving a call is missed during that time. In view of the above, the present invention provides a simplified portable telephone in which a control channel can be smoothly established when necessary. When establishing a control channel for connecting to a public base station and a private parent station,
And, organic and change operation means for changing the frequency for attempted establishment of a control channel, and a trial frequency controlling means for controlling the frequency for attempted establishment of a control channel in response to the operation of the change operation means
Mobile phone with a retractable antenna
That also use a retractable antenna as the change operation means
It is . In order to change the frequency of attempts to establish a control channel.
A retractable antenna is also used as the changing operation means. Accordingly, because it is controlled such frequency for attempted establishment of a control channel when pulled out antenna increases, public
Smoothly establish control channels with base stations and self-owned master stations
Call, making it possible to miss calls
And a dedicated operation switch on the operation panel.
There is no need to provide
It becomes possible . Referring now to FIG. 1, a first embodiment of the present invention will be described.
An example will be described. This example shows a simplified mobile phone (P
HS: Personal Handyphone System. The simplified portable telephone of this embodiment has a radio unit 2 for performing radio communication with a base station, a digital modulation / demodulation unit 3 for performing modulation and demodulation of π / 4 shift QPSK, and a plurality of channels. A TDMA (Time Division Multiple Access) processing unit 4 for handling multiplex signals in a slot, an audio codec unit 5 for performing compression encoding and decoding of audio signals, and a microcontroller as a system controller. A computer (hereinafter, referred to as a “microcomputer”) 8 is provided. The radio unit 2 is provided with the above-described baseband IC (BBIC) for performing a control channel establishment process and a location registration process, interposed between the microcomputer 8 and the public base station or the private base station ( (See FIG. 3). A signal from the base station received by the antenna 1 is supplied to a digital modulation / demodulation unit 3 via a 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 the slots for a plurality of channels is supplied to the TDMA processing unit 4. In the TDMA processing unit 4, under 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 a microcomputer 8. Also, the TDMA processing unit 4
The output compressed audio data is supplied to the audio codec unit 5 and subjected to decoding processing (including error correction processing) and then converted to an analog signal. Then, the received audio signal output from the audio codec unit 5 is supplied to a speaker 6 constituting a receiver. A transmission audio signal output from a microphone 7 constituting a transmitter is supplied to an audio codec unit 5 and subjected to a compression encoding process (including an error correction encoding process) and then to a TDMA processing unit. 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 into the 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. Then, the modulated signal output from the digital modulation / demodulation unit 3 is supplied to the antenna 1 via the radio unit 2 and transmitted to the base station. Even if not described 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 regular intervals with a control channel frequency for the public base station is obtained. By receiving all of them, the control channel is established, and thereafter, wireless communication is performed with the public base station, and the location registration of being in the area of the public base station is performed. When entering the area of the private master station (home master station) in the power-on state, receive all necessary information transmitted from the private master station at regular intervals at the control channel frequency for the private master station. Establishes a control channel. At the time of reception for establishing a control channel, power several times that of a normal time is consumed. For example, the current consumption during normal operation is about 30 mA, whereas the current consumption during reception for establishing a control channel is about 100 mA. In the simplified portable telephone of the present embodiment, the microcomputer 8 outputs a ringing tone output section 11 for outputting a ringing tone upon receiving an incoming call, numeric keys and special input keys for inputting a telephone number and the like, and various operation modes. , A key input unit 12 provided with a stop key for forcibly returning to the 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 a caller's side at the time of calling. A display unit 14 for displaying a telephone number or the like is connected. Although not described above, the antenna 1 is of a retractable type. FIG. 2A shows a state at the time of storage, and FIG. 2B shows a state at the time of drawing. Reference numeral 20 denotes a telephone body. In FIG. 1, the position detector 9 includes a mechanical switch or the like, and the position detector 9 detects whether the antenna 1 is in the housed state or the pulled-out state. The detection output of the position detector 9 is supplied to the microcomputer 8. In the above arrangement, after the telephone number of the other party is input by operating the key of the key input unit 12, the call key 13 is input.
When is pressed, the microcomputer 8 first supplies telephone number data and the like as control data to the TDMA processing unit 4 and transmits it to the base station through the control channel. As a result, the line connection with the other party is established, and a call is made possible. Here, the communication is performed using the communication channel. At the time of the line connection processing, the communication frequency and the slot position data of the communication channel are transmitted as control data from the base station using the control channel, and the TDMA processing is performed. The data 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. I do. Therefore, the call is made using the call channel notified from the public base station or the private parent station. Further, paging data is transmitted as control data from the base station using the control channel, and this paging data is supplied from the TDMA processing unit 4 to the microcomputer 8 to detect an incoming call. Output unit 11
Is controlled to perform a ringing tone output operation. If there is a response due to the pressing of the call key 13 while the calling operation is being performed, response data is supplied from the microcomputer 8 as control data to the TDMA processing unit 4 and transmitted to the base station via the control channel. As a result, the line connection with the other party is established, and a call is made possible. Also in this case, the communication is performed using the communication channel notified from the base station. As described above, when the calling data is transmitted from the base station as the control data, the control channel is used. However, since the calling data has identification data such as telephone number data added thereto, the microcomputer 8 It can recognize that it is call data for itself. Although not described above, in a state where the control channel has not been established, the trial of establishing the control channel with the public base station or the private base station is repeatedly performed. In this example, based on the detection output of the position detector 9, the frequency of attempts to establish a control channel with a public base station or a self-owned master station is determined by the antenna 1
It is changed according to the state of. That is, the frequency of attempts to establish a control channel with a public base station or a private parent station is reduced when the antenna 1 is in the stowed state as shown in FIG. 2A, and the antenna 1 is pulled out as shown in FIG. Raised when in state. As described above, according to the present embodiment, when the antenna 1 is in the withdrawn state, the frequency of attempts to establish a control channel with the public base station or the private parent station is increased. Control channels can be smoothly established with base stations and self-owned parent stations,
The possibility of missed calls can be greatly reduced. Therefore, it is very effective for waiting when the user knows that a call will be received. Further, since the antenna 1 is also used as the change operation means, it is possible to reduce the complexity on the operation panel 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 attempts to establish a control channel changes in accordance with the state of the above, an operation switch or the like for changing the frequency of attempts may be separately provided. Further, the trial frequency may be changed not in two steps but in multiple steps. According to the present invention, the frequency of attempts to establish a control channel for connecting to a public base station or a private base station can be arbitrarily changed by operating the change operation means. When the establishment is required, the control channel can be smoothly established by increasing the trial frequency, and the possibility of missed incoming calls can be greatly reduced. Further, by using a retractable antenna as the change operation means, the complexity on 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 THE 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 illustrating an example of a communication state for control channel establishment processing and location registration processing. [Description of Signs] 1 Antenna 2 Radio unit 3 Digital modulation / demodulation unit 4 TDMA processing unit 5 Audio codec unit 6 Speaker 7 Microphone 8 Microcomputer 9 Position detector 11 Ring sound output unit 12 Key input unit 13 Call key 14 Display unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04Q ^7/ 00-7/38 H04B ⁷ /24-7/26

Claims (1)

(57) when performing the Patent Claims 1. A process for establishing a control channel in order to connect with the public base station and private master station, change operation for changing the frequency for attempted establishment of the control channel easy having means, and a trial frequency controlling means for controlling the frequency for attempted establishment of the control channel in response to the operation of the change operation means
In the easy-type mobile phone has a retractable antenna, a simplified type portable telephone according to claim <br/> be used also the retractable antenna as the changing operation means.