KR100313311B1 - An apparatus for producing mode changing signal and a portable communication terminal - Google Patents

Abstract

The present invention relates to a transmitter for generating a pilot signal having a specific PN offset for switching a call mode, and a wireless communication device for receiving the pilot signal and automatically switching the call mode to an environment-friendly mode.

The transmitting apparatus of the present invention comprises: receiving means for receiving CDMA forward channel signals from a plurality of adjacent base stations; Means for obtaining a system time for synchronizing between systems from said forward channel signal; Means for generating a pilot channel signal with a specific PN offset that cannot be received from the neighbor base station in time for the system time; Means for transmitting the pilot signal over the entire CDMA frequency band so that all CDMA terminals present in coverage can receive.

Description

Code division multiple access transmitter for generating a specific pilot signal for mode switching, and a wireless communication device corresponding to the apparatus. {AN APPARATUS FOR PRODUCING MODE CHANGING SIGNAL AND A PORTABLE COMMUNICATION TERMINAL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a code division multiple access (CDMA) wireless communication system, and more particularly, to a transmitter for generating a pilot signal having a specific PN offset for switching a call mode, and to receive and call the pilot signal. The present invention relates to a wireless communication device for automatically switching a mode to an environmentally friendly mode.

As wireless communication devices such as cellular phones and personal mobile communication terminals have emerged as necessities of modern life, mature cultural consciousness is required in connection with their use. In particular, the telephone ringing tone of a wireless communication device is pointed out as a serious noise pollution in places that are not familiar with noise, especially where quietness is required.

Accordingly, the present applicant has already described the call mode of the wireless telephone in the environment mode (for example, vibration mode, optical mode) in places not familiar with noise through Korean Patent Application Nos. 98-34681 and 98-50736. Mode, weak sound mode, etc.) has been proposed.

However, the above-mentioned application does not mention the specific technology applied to the mobile communication system of the code division multiple access method.

The code division multiple access mobile communication system has been developed from the standard for transmitting / receiving voice signals, and has been discussed as the IMT-2000 standard capable of transmitting high speed data as well as voice. The IMT-2000 standard aims to provide services such as high quality voice, moving picture, and Internet search.

In order to facilitate understanding of the present invention, the CDMA industry standard specification is briefly described below.

In CDMA wireless communication systems such as cellular systems, personal communication systems, and IMT-2000 systems, a pilot channel is a subchannel inside an uplink CDMA link (from a base station to a mobile station). This pilot channel is used by the base station (often referred to as cell site) to help the mobile station achieve initial synchronization with the base station and to provide time, frequency and phase tracking information of the signal transmitted from the cell site. However, in order for a mobile station to use a pilot channel for synchronization or the like, it must first receive a pilot channel. The mobile station attempts to receive the pilot channel each time the power is turned on and whenever the tracking for the pilot channel fails. All cell sites in a CDMA system have a PN binary code sequence known by all mobile stations so that the base stations can be easily distinguished from each other by the mobile station, and each base station has the same pilot channel binary code sequence with a different timing offset. Using the same pseudo-random number (PN) binary code sequence for the pilot channel.

The reception of the pilot channel is performed inside the mobile station by a circuit, usually called a searcher inside the CDMA modem circuit. The process of receiving a pilot channel involves first converting an incoming signal into its digital representation, and then using a series of initial guesses (hypotheses) to the received signal and the pilot channel PN sequence for accurate timing of the pilot channel PN sequence. Comparing the generated signals for each other. When the estimation of the timing of the pilot channel PN sequence generated in this way matches the timing of the pilot channel PN sequence, a cumulative value having a large value is generated by comparing the generated PN sequence with the pilot channel PN sequence.

Thus, if a cumulative value exceeding a certain threshold is generated by comparison between the received signal and the generated PN sequence, the hypothesis about the timing of the pilot channel PN sequence is considered tentatively valid and stored for later evaluation.

After the mobile station is synchronized with the base station, if the mobile station is out of the communication area of the current base station, the base station sends a list of other base stations that can assume access control. After synchronizing with the base station, the searcher circuit enters a search mode to search for PN sequences from other base stations. If the searcher circuit finds a PN sequence signal of sufficient strength, it stores the PN timing offset of the signal received from the base station so that the signal strength of the current base station drops and the signal strength of one or more other base stations begins to increase significantly. The mobile station then starts calling the handoff procedure.

The CDMA standard briefly mentioned above is also adopted in IMT-2000, a next generation mobile communication system. Therefore, there is an urgent need to develop a transmission apparatus and a wireless communication apparatus for switching call modes that can be most suitably applied to a CDMA scheme.

A primary object of the present invention is to generate a mode switch signal that can automatically switch the call mode of a mobile communication device without making any changes to the hardware of the mobile communication device.

To this end, it is an object of the present invention to provide a code division multiple access transmission apparatus for generating a pilot signal having a specific PN offset for mode switching.

Another object of the present invention is to provide a wireless communication device having a software algorithm for receiving the pilot signal and discriminating it as a mode switching signal.

Other objects and advantages of the invention will be described below and will be appreciated by the practice of the invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the appended claims.

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate the presently preferred embodiments of the invention and, together with the description of the following preferred embodiments, serve to explain the principles of the invention.

1 shows a state diagram of switching a call mode of a wireless communication device by using a transmitter installed in a place unfamiliar with noise.

2 is a block diagram illustrating a CDMA transmission apparatus according to an embodiment of the present invention.

FIG. 3 is a flowchart illustrating a process of generating and transmitting a pilot signal having a specific PN offset using the transmitter of FIG. 2.

4 is a block diagram of a CDMA wireless communication device according to an embodiment of the present invention.

FIG. 5 shows a detailed block diagram of the searcher unit of the CMC circuit shown in FIG.

6 is a flowchart illustrating a process of automatically switching a call mode to an environment-friendly mode by a wireless communication device receiving a pilot signal having a specific PN offset.

<Explanation of symbols for the main parts of the drawings>

210a, 210b: antenna 220: RF switching unit

230: RF / IF reception block 240: demodulator

250: control unit 260: memory

270: RF / IF transmission block 280: pilot channel generator

341: despreader 342: PN generator

343: accumulator 344: energy calculator

345: comparator 346: memory

In order to achieve the above object, a transmitter in one aspect of the present invention comprises: receiving means for receiving a CDMA forward channel signal from a plurality of adjacent base stations; Means for obtaining a system time for synchronizing between systems from said forward channel signal; Means for generating a pilot channel signal with a specific PN offset that cannot be received from the neighbor base station in time for the system time; Means for transmitting the pilot signal over the entire CDMA frequency band so that all CDMA terminals present in coverage can receive.

Accordingly, the transmitting apparatus of the present invention can instruct all CDMA terminals present in the reception region of the pilot signal to automatically switch the call mode.

The transmitter is a means for acquiring and storing frequency bands used by the base station and neighboring base stations currently located from the forward channel received from the receiving means, PN offset values of pilot channels in use in the corresponding frequency bands, and received signal levels. It may further include.

In addition, the transmitter as an aspect of the present invention may additionally include means for storing the specific PN offset. In this case, the specific PN offset is not specifically used by the base station among the 512 offset values, and is specifically allocated only for call mode switching.

As another aspect of the present invention, the transmitting apparatus may further include means for calculating the specific PN offset value. In this case, the specific PN offset is shifted by a constant value from the PN offset value used by the base station currently located, and is calculated so as not to overlap the PN offset values of all pilot channels that the CDMA terminal can receive.

Further, the transmitting means is configured to periodically transmit the pilot signal sequentially in accordance with the frequency band for all frequency bands of the CDMA forward channel.

The transmission apparatus of the present invention may additionally include means for manually setting the power strength of the mode transmission pilot transmission signal externally.

In order to achieve the above another object, the wireless communication device of the present invention comprises: receiving means for receiving a CDMA forward signal transmitted from a base station and a pilot signal having a specific PN offset for call mode switching; Storage means for storing the specific PN offset value; Means for periodically searching for the specific PN offset value in an idle state; means for determining the presence or absence of a mode switch signal by comparing an energy value of a searched pilot signal with a threshold value; And a means for switching the current telephone ring call mode to an environmentally friendly mode when the mode change signal is present.

In this case, the storage means may further store a PN offset value of an active sector, a neighbor sector, and a candidate sector. In this case, the wireless communication device should additionally include means for calculating the specific PN offset value and writing it to the storage means.

This specific PN offset is shifted by a certain value from the PN offset value of the active sector and calculated so as not to overlap with the PN offset values of all pilot channels that the CDMA terminal can receive.

In addition, as another aspect of the present invention, the specific PN offset stored in the storage means may be specifically allocated only for switching the call mode, not used by the base station among the 512 offset values.

The wireless communication device of the present invention may additionally comprise means for storing the current call mode state. At this time, the mode switching means returns the current environment-friendly mode to the current call mode state when the mode switching signal is not received for a predetermined time.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 illustrates a doorway 100 of a place unfamiliar with noise (including a place requiring a quiet atmosphere and a place where noise is reluctant) and a wireless communication device 300 entering and leaving a place unfamiliar with noise through the doorway. Is shown. As a place unfamiliar with the said noise, a library, a theater, a lecture room, an office, a laboratory, a conference room, a church, a temple, a music listening room, an art gallery, an emergency room, a mortuary room, etc. are mentioned, for example.

The transmitter 200a described later is installed on the wall of the doorway 100. The transmitter 200b may be installed on the ceiling of a place that is not familiar with noise.

Therefore, the wireless communication device 300 entering the place where the transmitting apparatuses 200a and 200b of the present embodiment is installed receives the mode switching signal described later from the transmitting apparatus and changes the current call mode to the vibration mode or the optical mode. Automatically switch to the same environment friendly mode.

A. Transmitter

Hereinafter, a configuration of a transmitter of an embodiment according to the present invention will be described in detail with reference to FIG. 2.

As shown in FIG. 2, the transmitter 200 according to the present embodiment includes a plurality of antennas 210a and 210b, an RF switching unit 220, an RF / IF reception block 230, and an RF / IF transmission block 270. And a demodulator 240, a controller 250, a memory 260, a pilot channel generator 280, an output power setting unit 291, and an LCD 292.

The antennas 210a and 210b receive a CDMA forward channel signal, in particular a pilot channel, a synchronization channel, and a paging channel signal from a base station of a sector or a cell in which the transmitter 200 is located. Accordingly, the antennas 210a and 210b are frequency band signals assigned to all mobile communication service providers as well as frequency band signals of all mobile communication systems (i.e., cellular systems, PCS systems, and IMT-2000 systems) transmitted from the base station. Must be able to receive.

The transmitter of FIG. 2 includes antennas 210a and 210b capable of receiving a forward signal of a 800 MHz band cellular system and a forward signal of a 1.8 GHz band PCS system, respectively. However, the transmitting apparatus of the present invention is not necessarily limited thereto, and it is possible to receive all the signals of the above-described frequency bands with only one antenna.

The RF switching unit 220 is for alternately setting the reception mode and the transmission mode according to the transfer control signal of the control unit 250. Here, the reception mode means a state of transmitting a forward channel signal from the base station received through the antennas 210a and 210b to the RF / IF reception block 230, and the transmission mode is the RF / IF transmission. The pilot channel signal for mode switching transmitted from block 270 is radiated through the antennas 210a and 210b. The RF switching unit 220 must exist separately for each mobile communication system (cellular, PCS, IMT-2000).

The RF / IF reception block 230 is for converting a forward channel signal received through the antennas 210a and 210b into a baseband signal while the switching unit is set to a reception mode.

The RF / IF transmission block 270 converts a baseband pilot signal transmitted from the pilot channel generator 280 into a signal of a communication frequency band to enable propagation through an antenna while the switching unit is set to a transmission mode. It is for.

The controller 250 controls the frequency synthesizer (not shown) in the RF / IF receiving block 230 to convert the frequency band signals of the cellular system, the PCS system, and the IMT-2000 system into baseband signals, respectively. do.

The demodulator 240 converts the baseband signal transmitted from the RF / IF reception block 230 into digital data and transmits the digital signal to the controller 250 to obtain a system time from the baseband signal. The controller transmits the data to the pilot channel generator 280. Here, 'system time' means synchronization time information necessary for synchronization between the base station and the base station or the base station and the mobile station.

The memory 260 stores the CDAM protocol defined in IS-95 / IS-95A / B / C. Accordingly, the controller 250 controls the RF switching unit 220, the RF / IF receiving block 230, and the demodulator 240 according to the CDAM protocol stored in the memory 260 through a pilot channel. It performs synchronization acquisition, acquires system configuration and time information through sync channel, and processes paging channel message through paging channel.

In addition, the internal memory of the controller 250 includes a specific PN offset value for switching a call mode, a frequency band used for a base station and a neighboring base station currently located, a PN offset value for a pilot channel used in the frequency band, and a received signal. Information such as the level of the is stored. These information are obtained from pilot channel signals, sink channel signals, and paging channel signals transmitted from the base stations of the sectors or cells in which the transmitter is currently located.

The specific PN offset is preferably a mode switching PN offset which is not used at the base station among the 512 offsets and is specifically allocated only for call mode switching.

In addition, the specific PN offset value may be calculated by the calculating means in the controller and stored in the internal memory. That is, the specific PN offset is shifted by a certain value from the PN offset value used by the base station currently located, and may be calculated so as not to overlap the PN offset values of all pilot channels that the CDMA terminal can receive. That is, when the PN offset used by the base station currently located is called PN1, and the PN offset of the pilot channel that can be received by the transmitter of the present embodiment is PN2, PN3, ..., PNf, the specific PN offset for mode switching is made. (PNs) may be calculated to satisfy Equation (1) below.

PNs = PN1 + n ≠ PN2 ≠ PN3 ... ≠ PNf ... (1)

Where n is an integer

The pilot channel generator 280 receives the periodic signal generation control signal from the controller 250, and has a pilot channel signal having the specific PN offset value in accordance with a system time from the demodulator 240. It generates and delivers to the RF / IF transmission block (270). The pilot signal for mode switching transmitted to the RF / IF transmission block 270 is made of RF signals according to the frequency band of the cellular system, the frequency band of the PCS system, and the frequency band of the IMT-2000 system. Is radiated into the air through the antennas 210a and 210b. At this time, before the pilot channel signal reaches the RF switching unit 220, the controller 250 must switch the RF switching unit 220 from the reception mode to the transmission mode.

The output power setting unit 291 is for manually adjusting the power strength of the pilot signal for mode switching radiated through the antennas 210a and 210b from the outside. Therefore, the user can easily adjust the radiation range of the pilot signal.

In addition, the LCD 292 is for displaying the malfunction of the transmitter to the outside.

A process of transmitting a mode switching signal having a specific PN offset by using the transmitter having the above-described configuration will be described in detail with reference to FIG. 3.

First, when power is applied to the transmission apparatus of this embodiment (S300), the control unit disables the operation of the power amplifier in the RF / IF transmission block (S301).

The control unit blocks SYNC80M, which is an inter-base station synchronization signal (ie, system time) transmitted from the demodulator to the pilot channel generator (S302).

When the blocking of the output amplifier and the synchronization signal is completed, the RF switching unit is set to the reception mode to receive the forward channel signal transmitted from the base station (S303).

In the state in which the reception mode is set, the controller controls the RF / IF receiving block and the demodulator according to the CDMA protocol specified in IS-95 / IS-95A / B / C. The pilot channel synchronization is obtained from the primary channel (S304). In addition, the control unit acquires system configuration and time information in the subsequent sink channel (S305), and obtains a paging channel message through the paging channel (S306).

From the neighbor list message and the CDMA channel list message in the paging channel message, the frequency band used in the current base station and the neighboring base station, and the PN offset value of the pilot channel in use in the corresponding frequency band. And the received signal level is extracted and stored in the internal memory of the controller (S307).

In addition, the controller calculates a specific PN offset for mode switching that is different from the PN sequence offset value transmitted from the outside, and stores it in the internal memory together with the frequency band information. (Or, only one of the 512 PN sequence offsets specifically allocated for mode switching may already be stored in internal memory.)

The controller checks whether the above-described routine has been performed on the first channel or the second channel of all mobile communication service providers. (S308) At this time, the routines described above for all mobile communication service providers ( If the execution of S304 to S307 is not completed, the process returns to the step S304 and the above-described process is repeated.

On the other hand, if the execution of the routines S304 to S307 described above is completed for all mobile communication service providers, the pilot, sink, and paging channel for the first frequency band being used by a particular operator of the sector or cell in which the transmitter is located is used. Obtain the (S310).

After acquiring the pilot channel, information previously stored, that is, the number of frequency bands used by the current base station and the neighboring base station, the PN offset value of the pilot channel in use in the corresponding frequency band, and the information about the received signal level It checks whether it has been updated and stores the updated information (S311).

If the CDMA channel number or the specific PN offset value is changed or a new frequency band is added, the previously stored CDMA channel number and the specific PN offset value are updated and automatically corrected.

The control unit instructs the demodulator to transmit the system time SYNC80M, which is a synchronization signal between base stations, to the pilot channel generator. (S312) Here, the 'synchronization signal' is an inter-base station synchronization required for the mobile station to perform handoff with the base station. Means signal.

This synchronization signal (ie, system time) is used as a reference time of the mode switching pilot signal emitted from the pilot channel generator.

The controller switches the reception mode of the RF switching unit to the transmission mode while the synchronization reference for the mode switching signal is established. (S313) After switching to the transmission mode, the pilot channel generation unit sets a specific PN offset for mode switching. Generate a pilot signal with a value and pass it to the RF / IF transmission block. The RF / IF transmission block transmits the mode switching signal to the antenna to allow air emission (S314). At this time, the RF / IF transmission block is present for each system so as to periodically exist for each operator's frequency band of each system. It is also possible to sequentially emit the mode switching signal.

In addition, the RF / IF transmission block may be configured in a single manner, and the RF switching unit may be configured for each system to sequentially radiate the mode switching signal periodically for a frequency band of each operator of each system.

When the emission of the mode switching signal for all the frequency bands of the mobile communication service provider is completed, the process returns to S310 and repeats the same routine described above (S314) to obtain update information for the other second mobile communication service provider.

B. Wireless Communication Equipment

Hereinafter, a configuration of a wireless communication apparatus according to the present invention for receiving a pilot channel signal for mode switching from a transmitting apparatus of the present embodiment and automatically switching a telephone ring tone mode to an environmentally friendly mode will be described in detail with reference to FIGS. 4 and 5. .

The wireless communication device of the present invention is preferably a code division multiple access mobile communication system (cellular phone, PCS phone, IMT-2000 phone, etc.).

4 is a block diagram showing a code division multiple access wireless telephone according to an embodiment of the present invention. This figure further applies to various cordless telephones of another embodiment of the present invention, including PCS phones and IMT-2000 phones.

According to the wireless communication device of the present embodiment, the forward channel signal from the base station is received through the antenna 310, and then converted from analog to digital in the A / D conversion unit 330 to convert the CMC (CDMA modem circuit: CDMA modem circuit). Filter is filtered at the RF transmitter / receiver 320, mixed to a lower frequency, and subjected to automatic gain control before being given to (340) [the mixed received signal is its in-phase (I) and quadrature (Q) Separated into components] I and Q demodulated. Controlled by a central processing unit (CPU) 350, the CMC 340 demodulates the I and Q signals into interleaved signal streams, which are in accordance with embodiments of the present invention. The interleaved is de-interleaved, viterbi decoded by the digital signal 370, and digitally decoded, and then decoded into an acoustic signal by a coder / decoder 380 to be used as an interface circuit. Controlled amplification by 390 then output through telephone speaker 393. Similarly, when the telephone's microphone 394 detects the user's voice, it follows the reverse path as described above via the wireless telephone. The key input unit 392 and the display unit 391 provide input and output of a typical user.

On the other hand, the mode switching pilot signal transmitted through the transmission device of the present embodiment is received through the antenna 310, the A / D converter 330 is converted from analog to digital CMC (CDMA modem circuit: CDMA Modem Before being given to the circuit 340, it is filtered by the RF transmitter / receiver 320, mixed to a lower frequency, and automatic gain control is performed. The mode switching pilot signal transmitted to the CMC 340 is searched by the searcher unit inside the CMC shown in FIG. 5, and when it is determined that the search result is the mode switching signal, the central processing unit 350 includes a mode switching unit ( 360) to switch the call mode. That is, when the pilot signal for mode switching is found, the CPU 350 reads the current call mode state stored in the internal memory. In this case, when the current call mode is the telephone ring mode or the music sound mode, the CPU 350 instructs the mode switching unit 360 to switch to the vibration mode. On the other hand, when the current call mode is the vibration mode, the CPU 350 instructs the mode switching unit 360 to maintain the current call mode.

Reference numeral 361 in Fig. 4 is a vibration motor, 362 is a telephone ring.

Hereinafter, a detailed configuration of the searcher unit of FIG. 4 will be described with reference to FIG. 5.

The controller 347 is for controlling the overall operation of the PN sequence phase search apparatus. In addition, the controller 347 adjusts various parameters (range of integration section, window size, asynchronous accumulation section, etc.) and controls phase shift of the mobile station generated PN sequence of the PN generator 342. The received signal may be a signal received by the mobile station and RF processed and digitized such as down conversion and input to the modem chip. In this case, the received signal includes a PN sequence generated from a predetermined base station and a mode switching pilot signal transmitted from the transmission apparatus of this embodiment.

The despreader 341 performs an operation of despreading by multiplying the PN sequence value from the PN generator 342 with respect to the received signal input at an arbitrary time point. At this time, the phase search start point of the PN sequence generated in the mobile station is preset. For example, the phase search start point may be from the PN offset '0'.

In addition, the sync accumulator 343 accumulates the output of the despreader 341 during the corresponding integration period. The energy calculator 344 calculates the detection energy according to the correlation of the received PN sequence based on the accumulated value of the accumulator 343. The comparator 345 compares the calculated detection energy with a threshold energy. The threshold energy can be arbitrarily set by the controller 347.

If the controller 347 captures a reliable PN sequence phase that satisfies a predetermined condition, the controller 347 reports this to a higher processor. As a result, the mobile station performs a demodulation operation on received signals such as a synchronization channel and a paging channel.

The memory 346 stores an active set for storing a PN offset value used by a base station communicating with a current wireless communication device, and a PN offset value used by a base station that may be used for handoff in the future. Neighbor set for use, Candidate set for storing PN offset value of base station which is not currently used for data demodulation but has enough energy to demodulate data, and specific PN for mode switching Stores another set for storing offset values.

The specific PN offset is preferably a mode switching PN offset which is not used at the base station among the 512 offsets and is specifically allocated only for call mode switching.

In addition, the specific PN offset value may be calculated by a computing means in the controller (ie, the central processing unit) and stored in the memory 346. That is, the specific PN offset is shifted by a constant value from the PN offset value used by the base station currently located, and may be calculated so as not to overlap the PN offset values of all pilot channels that the CDMA terminal can receive. That is, when the PN offset in the active set is called PN1 and the PN offsets in the neighbor set and the candy data set are PN2, PN3, ..., PNf respectively, the specific PN offset (PNs) for mode switching is as follows. It can be calculated to satisfy Equation (1).

PNs = PN1 + n ≠ PN2 ≠ PN3 ... ≠ PNf ... (1)

Where n is an integer

The controller transmits the specific PN offset value of the subset to the PN generator once in a predetermined period to despread the received signal. The despread received signals are accumulated during the integration period by the synchronization accumulator. The energy calculator 344 calculates the detection energy according to the correlation of the received PN sequence based on the accumulated value of the accumulator 343. The comparator 345 compares the calculated detection energy with a threshold energy and transmits the comparison result to the controller.

At this time, when the calculated detected energy is greater than the threshold energy, the controller determines that the mode switching signal is received, and instructs the mode switching unit to switch to the vibration mode when the current call mode state is the sound mode. On the other hand, when the calculated detection energy is smaller than the threshold energy, the controller determines that the mode switching signal is not received and instructs the mode switching unit to restore the mode. That is, when the mode to be restored is the sound mode, the mode switching unit is instructed to switch to the sound mode, and when the mode to be restored is the vibration mode, the current call mode is maintained as it is.

Therefore, the call mode state and the mode change variable before switching are stored in the internal memory of the controller. That is, the call mode state before switching means the telephone call mode state immediately before the call mode is switched, and the mode change variable indicates an indicator for identifying whether the mode is switched. For example, the call mode state before switching may be set to '1' in the sound mode and '0' in the vibration mode.

The mode change variable is an identifier for determining whether the wireless communication device switches mode.

Hereinafter, a process of automatically switching the call mode to the environment-friendly mode and restoring to the original call mode will be described in detail with reference to FIG. 6.

The searcher unit of the wireless communication device searches for a specific PN offset value for mode switching from the received signal (S401).

At this time, if the searched signal energy value is larger than the threshold energy value, the controller determines whether the mode change variable of the internal memory is set to '1' (the mode change variable is set to '0' when the power is applied. (S401, S402)

If the mode change variable is set to '1', it indicates that the mode change signal has already been detected (already the call mode has been changed), and therefore, the scheduled PN offset management set (active set, neighbor set, candy data set). Search for any one again (S411).

On the other hand, if the mode change variable is not set to '1', it is determined whether the call mode state before switching of the internal memory is the sound mode. (S404) When the call mode state before the switch is the sound mode, the controller Set the mode switch variable to '1' and change the call mode to an environmentally friendly mode such as vibration mode. (S405) Then, the display unit displays a manner mode (etiquette mode). (S406)

If the call mode state before the switching of the internal memory is the vibration mode in step S404, the controller instructs the mode switching unit to keep the current call mode as it is, and the predetermined PN offset management set (active set, neighbor set, candy data set). The searcher unit is controlled to search for any one again (S411).

On the other hand, if the signal energy value found in step S402 is smaller than the threshold energy value, the controller determines whether the mode switching variable of the internal memory is set to '1'. (S407) At this time, the mode switching variable is '1'. If not set, any one of the predetermined PN offset management sets (active set, neighbor set, candy data set) is searched again (S407, S411).

On the other hand, if the mode switching variable is set to '1' in step S407, it is checked whether the restoration number has been reached. (S408) In this case, if the restoration number has not yet been reached, the existing restoration number is increased. Then, it searches again for one of the scheduled PN offset management sets. (S411)

The recovery frequency here is determined in advance when the power of the wireless communication device is applied. When the recovery count is reached, the controller releases the setting of the mode changeover variable and restores the original user call mode from the vibration mode (S409).

Then, the user call mode is displayed on the display unit of the wireless communication device, and one of the predetermined PN offset management sets (active set, neighbor set, candy data set) is searched again (S410).

In addition, the wireless communication device of the present embodiment operates a sleep mode to save battery power consumption. When the wireless communication device operates in the sleep mode, after waking from sleep and searching for a pilot channel having a PN offset value of the previous active set or neighbor set and assigning a signal to a finger, a specific PN offset for mode switching is performed. Do the same.

As described above, the present invention is not limited to the above-described embodiments, and various changes within the equivalent scope of the technical concept of the present invention and the claims to be described below by those skilled in the art to which the present invention pertains. Of course, modifications and variations are possible.

As described above, the present invention automatically switches the call mode of all wireless communication devices entering and leaving a place unfamiliar with noise from the telephone ring sound mode or the music sound mode to the vibration mode or the optical mode. Unpleasant feelings can be prevented beforehand.

In addition, changing the hardware of an existing portable wireless communication device is quite economical because it requires software modifications.

Claims (10)

Receiving means for receiving a CDMA forward channel signal from a plurality of adjacent base stations which can be received at a current location; Means for obtaining a system time for synchronizing between systems from said forward channel signal; Means for generating, according to the system time, a pilot channel signal for switching a call mode having a specific PN offset not overlapping with a PN offset of the neighboring base station to distinguish it from a communication pilot channel signal received from the neighboring base station; Means for transmitting the pilot channel signal over the entire CDMA frequency band so that all CDMA terminals present in coverage can receive; Thereby, the code division multiple access transmission apparatus for generating a specific pilot signal for mode switching, which instructs switching of a call mode for all CDMA terminals existing in the reception region of the pilot signal. The method of claim 1, And means for acquiring and storing the frequency bands used by the base station and the neighboring base station, the PN offset value of the pilot channel in use in the corresponding frequency band, and the level of the received signal from the forward channel received from the receiving means. And a code division multiple access transmitter for generating a specific pilot signal for mode switching. The method of claim 2, Further means for storing said particular PN offset; The specific PN offset is a code division multiple access transmitter for generating a specific pilot signal for mode switching, characterized in that it is not used at the base station among the 512 offset values and is specifically allocated only for call mode switching. The method of claim 2, Further means for calculating the specific PN offset value; The specific PN offset is shifted by a constant value from the PN offset value used by the base station currently located and calculated so as not to overlap with the PN offset values of all pilot channels that the CDMA terminal can receive. A code division multiple access transmitter for generating a specific pilot signal of the apparatus. The method according to claim 3 or 4, And said transmitting means transmits said pilot signal periodically for every frequency band of a CDMA forward channel sequentially according to said frequency band. The method of claim 5, And a means for manually setting an external power strength of the pilot signal externally to generate a specific pilot signal for mode switching. Receiving means for receiving a CDMA forward signal transmitted from a plurality of adjacent base stations and a pilot signal having a specific PN offset for call mode switching; Storage means for storing a PN offset value equal to the specific PN offset; Means for retrieving a PN offset value stored in said storage means periodically in an idle state; Means for determining the presence or absence of a mode switching signal by comparing an energy value of the found pilot signal with a threshold value; And a means for switching the current telephone ring call mode to an environmentally friendly mode when the mode change signal is present. The method of claim 7, wherein The storage means further stores a PN offset value of an active sector, a neighbor sector, and a candidate sector; Means for computing the specific PN offset value and writing it to the storage means; And the specific PN offset is shifted by a constant value from the PN offset value of the active sector and calculated so as not to overlap with the PN offset values of all pilot channels that the CDMA terminal can receive. The method of claim 7, wherein And a specific PN offset stored in the storage means is not used at the base station among the 512 offset values and is specifically allocated only for switching the call mode. The method according to claim 8 or 9, Further means for storing the current call mode state; And the mode switching means returns the current environment-friendly mode to the current call mode state when the mode switching signal is not received for a predetermined time.