KR100228302B1 - Method for selecting system mode of dual type portable phone - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

Dual Mode A technology for selecting the analog or digital system mode of a mobile phone.

I. The technical problem that the invention is trying to solve

The present invention provides a method of reducing call reception rate and current consumption by automating the selection of analog or digital system mode according to regional variation in a dual mode mobile phone.

All. Summary of Solution of the Invention

In order to optimize system mode scans, the digital mode system selection is as follows in areas where the mobile phone is only serviced by analog systems.

1) After the user receives a call or transmits a call, the user ends the call by pressing the end key or receives a release message from the base station. In other words, do not acquire a digital system again.

2) If the call fails by pressing the send key, the analog service state is bad in the redial off mode, so it immediately switches to the digital system acquisition. In the redial on mode, if the current number of redials is less than or equal to the predetermined number, the user redials in the analog mode and switches to digital system acquisition immediately if the number of times of the redial is exceeded.

3) If registration fails in analog mode, it remains in analog mode.

4) If the acquisition of the word sync fails with a weak electric field, it immediately switches to the digital system acquisition.

5) In the analog system, when the mobile phone is idle for a predetermined time (for example, 5 minutes), the analog channel is rescanned to catch the optimal channel and then enter the idle state again. It is used to switch to digital system acquisition without analog channel rescan every fixed time (eg 5 minutes) in analog mode idle. When the digital system is acquired, it enters an idle state to receive digital service.

la. Important uses of the invention

It is used to make the analog or digital system mode selection of the dual mode mobile phone automatically when moving around.

Description

How to choose system mode

The present invention relates to an analog or digital system mode selection method of a dual mode mobile phone in a cellular telephone system, and more particularly, to a method for allowing a dual mode mobile phone holder to automatically select a system mode suitable for the area.

In general, the code division multiple access (hereinafter referred to as CDMA) scheme is designed as a digital system, and the frequency modulation scheme is designed as an advanced mobile phone service (Advanced Mobile Phone Service). AMPS.) A system, or analog system. Dual-mode phones are designed to support both digital and analog system modes.

In order to make a call using such a dual mode mobile phone, it is ideal for a user to select a service that can be optimally serviced according to the environment in which each system is constructed. In other words, it is better to synchronize with digital system to receive call service in the area where digital and analog systems are established at the same time, and to receive call service by synchronizing with analog system in areas where only analog system is configured.

However, the conventional dual-mode mobile phone is a digital priority selection mode, so if the digital system is in the serviced area, it tunes to the digital base station. However, when the digital system is not serviced and only the analog system is serviced, the mobile phone is powered up. There is an absurdity of finding an analog system only after first looking for a digital system and recognizing that there is no digital system. In addition, as described above, after searching for an analog system, the user tunes to the analog base station, and when the user disconnects the call, the user immediately finds the digital system for a predetermined time, for example, for 60 seconds, unnecessary labor is required. In the incoming call, the digital system again finds the digital system near a predetermined time, for example 60 seconds. It also looks for digital systems every three minutes, even when idle in analog mode.

As such, when a dual-mode mobile phone moves to an area where only an analog AMPS base station is serviced, it transmits a call, but when the call is terminated after receiving a call, it switches from analog mode to digital mode for about 60 seconds. The following problem arises because of the search. In other words, the current is consumed twice as much as the analog idle state for digital mode system tuning, and the process of acquiring the digital system does not receive the incoming call. For this reason, there is a problem that the reception rate decreases and the battery life of the mobile phone is shortened.

Accordingly, an object of the present invention is to provide a method of reducing call reception rate and current consumption by automating the selection of an analog or digital system mode according to a change of area in a dual mode mobile phone.

Another object of the present invention is to provide a method for reducing the current consumption and increasing the call reception rate by properly performing a digital system service scan in an area where a dual mode mobile phone is analog only.

The present invention for achieving the above object is a system mode selection method for automatically switching between the digital mode and the analog mode in a dual-mode terminal located in the area where only the analog system is constructed, if the power-on digital priority selection mode? A first step of checking, a second step of checking whether the digital system acquisition failed in the digital mode, a third step of switching to the analog mode when it is determined that the acquisition of the digital system is not the digital priority selection mode, or the analog mode; If the end key is not detected after the call or no release message is received, and the call attempt fails, the terminal does not connect or fails to register by redialing the redial off mode or redialing the number of times in redial on mode. Idle state after a certain time, or the analog signal is weak It loses sync word to perform the digital acquisition system, characterized by scanning constituted by any fourth step back to the first process.

1 is a block diagram of a dual mode mobile phone to which the present name applies

2A and 2B are flowcharts illustrating a process of automatically processing an analog or digital system mode selection according to a change in a region of a dual mode mobile phone according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. Also, in the following description, many specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific details. It is self-evident to those of ordinary knowledge in Esau. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a block diagram of a dual mode mobile phone to which the present invention is applied.

Antenna 10 transmits and receives radio waves. The RF unit 11 tunes and amplifies an RF channel and has a base band analog component for connecting an analog signal and a digital domain. The baseband analog component is a receiving circuit which downconverts an analog IF signal into a baseband frequency domain and converts the baseband signal into a digital signal and a transmission circuit converting digital data into an analog baseband signal and upconverting it back into an IF frequency domain. Is done. The central processing unit (hereinafter referred to as CPU) 15 controls the overall operation of the terminal as a whole. The ROM 12 stores programs and data for controlling the overall operation of the terminal. RAM 13 stores various temporary variable values and other data according to the execution of the program. EEPROM 14 permanently stores the phone number, electronic serial number (ESN) and system parameters of the terminal. The AMPS unit 19 modulates and demodulates the analog signal and processes the data. The CDMA unit 20 modulates the digital CDMA signal. Vocoder 16 codes and decodes speech frames. Codec 17 converts digital voice signals to analog and digitizes the analog voice signals. A microphone and a speaker 18 are connected to the codec 17.

2A and 2B are flowcharts illustrating a process of automatically processing an analog or digital system mode selection according to a change in a region of a dual mode mobile phone according to an exemplary embodiment of the present invention, respectively. The description of the transition between the initialization state, the idle state, the access state, and the call state in each mode, and the detailed operation inherent in each mode is omitted.

According to the flowcharts of FIGS. 2A and 2B, it is possible to select a system mode that reduces unnecessary current consumption and raises a call reception rate in an area where analog service is supported. The unnecessary current consumption is due to frequent scans for digital system acquisition even in areas where only analog services are supported as described above.

First, referring to FIG. 2A, when the terminal supporting the digital and analog dual mode is powered up in step 50, the CPU 15 checks whether the terminal is in the digital priority selection mode in step 51. In the digital priority selection mode, the digital acquisition failure flag is not set immediately after the power is turned on. Subsequently, it is determined whether there is a digital signal received from the base station, and if there is a signal, the signal is synchronized with the signal to transition to an idle state. At this time, if the digital signal does not exist or the synchronization is not set, the digital acquisition failure flag is set. The terminal exists as an idle state that can transmit and receive calls at any time in the digital system mode, but when the call is actually received or the user transmits the call, the terminal enters the access state and sends a response message or transmits a transmission message. At this time, if it fails, it returns to the idle state, and if the transmission is successful, the call path is connected to receive the call service.

In this state, when a dual mode terminal is moved to an area where a digital system is not constructed while receiving digital services, a digital system acquisition failure appears in the initialization state because no digital signal exists. In this case, the result of checking whether the digital acquisition has failed by the CPU 15 in step 52 will be determined as a failure. In this case, the analog mode is performed.

As a result of the determination in steps 51 and 52, if the digital acquisition failure state is not detected in the digital priority selection mode or the digital priority selection mode, the process proceeds to step 53 to execute the digital mode.

An operation in the case of selecting an analog system will be described with reference to FIG. 2B.

In the initialization state, when the analog message is received by tuning to the analog control channel, it transitions to the analog idle state. Of course, here, too, as in the digital mode, the state can receive a call or transmit a call. When a call is received in this state, each sends a send message and a paging response message. After the service is connected, the user transfers to the call state and receives the call service. In this state, when the call is terminated, a conventional system immediately transitions to the digital system mode and performs an initialization operation. However, the method according to the present invention receives a call from the base station by receiving a call from the base station after receiving a call service or receiving a release message from the base station. If you hang up, it remains in analog system mode and remains idle.

Therefore, in order to select the system mode according to the present invention, when performing the analog mode control routine, as shown in step 62, after the call is completed, it is checked whether an end key is detected or a release message is received. . When the check result is detected that the end key detection or release message is received, the transition to the initialization state. In the access state, if the call attempt fails, as shown in step 63, it is checked whether it is in the redial off mode. If the check results in the redial off mode, the process returns to step 51 of FIG. 2A for the digital system acquisition scan. On the other hand, in the redial on mode, an attempt is made to dial a predetermined number of redials, and when the call path is connected, the mobile station transitions to the call state and if the call fails, the process returns to step 51 of FIG. 2A to scan the digital system acquisition. In addition, if it is determined that the registration failed in step 64 by checking the result of the registration attempt in step 60 described above, it is left idle in the analog system mode. In step 65, if it is determined that the word sync is lost in the area where the fading phenomenon or the analog signal is weak in the idle state, it is determined that the analog service cannot be performed. Go back to step In addition, when the time flag is set in the idle state of step 59 and the elapse of a predetermined time (for example, 5 minutes) is confirmed, the process returns to step 51 of FIG. 2A to scan the digital system acquisition. In this case, the analog single-mode telephone is channel-rescanned to find the best channel with the largest signal and is in the idle state again. In this embodiment, however, a scan is performed to acquire the digital system. When it comes in, it can acquire a digital system immediately within an average of 2.5 minutes, and receive digital service with better quality of service than analog.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention automatically controls the mode switching to reduce the call reception rate and current consumption as low as possible when switching between the digital mode and the analog mode in a dual mode mobile phone capable of servicing both digital and analog systems. In other words, in the case where the dual mode terminal has only an analog system, it is advantageous to prevent unnecessary current consumption and increase the call reception rate by reducing the digital system acquisition attempt.

Claims (1)

A system mode selection method for automatically switching between digital mode and analog mode in a dual mode terminal located in an area where only an analog system is constructed, A first process of checking whether the digital priority selection mode is on when the power is turned on; A second step of checking whether the digital system acquisition failed in the digital mode; A third process of switching to the analog mode when it is determined that the digital priority selection mode is not obtained or the digital system acquisition failure; In analog mode, if the end key is not detected after the call or no release message is received, and the call attempt fails, the terminal does not connect or redials by redialing the number of redials in redial off mode or redial on mode. And a fourth process of returning to the first process to perform a digital system acquisition scan when a predetermined time elapses, the analog signal is weak, or the word sync is lost.

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