JP2000068920A - Control channel search method and mobile communication device in mobile communication system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To control a control channel monitor cycle greatly variably according to a reception state of a control channel outside a service area where a mobile terminal has moved, thereby reducing current consumption of a battery. SOLUTION: In the configuration from the antenna sharing device 1 to the memory 17, when the control unit 11 moves out of the service area, the control unit 11 can receive a control channel and does not satisfy the standby zone selection level. It is determined whether or not the channel is an area outside the second area where reception is not possible. In the first out-of-service area, the control channel monitor period (Tma) during normal operation is kept as it is, and in the second out-of-service area, the control channel monitor period Tmb having a wider time interval than the control channel monitor period Tma is set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division multiplexing access (TDMA) type PDC (Personal Digital Cellular).
Telecommunicatin System) and PHS (Personal Handyp)
hone System) such as a control channel search method and a mobile communication device in a mobile communication system, particularly, corresponding to the reception state of the control channel outside the area where the mobile terminal has moved,
The present invention relates to a control channel search method and a portable communication device in a mobile communication system that captures a control channel by variably controlling a control channel monitor cycle at a wide time interval (denoted as large as appropriate).

[0002]

2. Description of the Related Art Conventionally, in a PDC or PHS, a portable telephone or a data communication device (referred to as a mobile terminal as appropriate) is, for example, an RCR (ARIB) -STD-27 at power-on.
According to standards such as F / 28, control channels (CCH: Contt
rol Channel / BCCH, CCCH, UPCH) is scanned and monitored, and a location registration sequence is executed as necessary. For example, in the PDC, the position information (zone number) notified through the captured control channel is compared with the immediately preceding position information stored in the home memory station (exchange / control station).
If the location information is different, location registration for this service area (zone number) is performed.

[0003] After the location registration, processing for a well-known call (outgoing) or incoming call (incoming) is performed. For example, at the time of calling, a connection request signal by transmitting a selection signal (telephone number) after off-hook at the mobile terminal is transmitted from the connected cell base station to the exchange / control station, where the database (subscriber file) For example, a frame having a fixed time period in TDMA is divided into a plurality of time intervals (time slots).
The communication channel divided by the above is assigned, and thereafter, a call is made.

When an incoming call is received, the switching / control station transmits a selection signal (telephone number) after off-hook at the originating mobile terminal, and the switching / control station reads the mobile terminal of the call destination (connection destination) from the subscriber file. After that, a plurality of cell base stations including the parked service area of the terminal station perform a simultaneous call through common control. The mobile terminal identifies the received calling signal and transmits a response signal. The switching / control station determines a cell base station to be connected to the radio channel, and further allocates a communication channel to perform the call.

FIG. 7 is a diagram for explaining a control channel monitoring cycle in such a conventional operation. FIG.
In this channel monitoring period, the control channel monitoring period is continuous at the control channel monitoring period Tma. The control channel monitor period Tma has a relatively short time interval in order to quickly capture the control channel.

[0006]

As described above, in the above conventional example, even when the mobile terminal moves out of the service area (out of the service area) and the state in which the control channel signal cannot be received continues,
Since the control channel monitor with a relatively short time interval is continuously performed at a constant cycle, the current consumption of the power supply battery of the portable terminal increases, and there is a disadvantage that the operation time (reception standby time, talk time) is shortened.

[0007] The present invention solves the above-mentioned problems in the prior art, and includes a control channel reception state outside a service area to which a mobile terminal has moved (a first out-of-service area which does not satisfy a reception zone selection level and a reception zone selection level). To the area outside the second area where the control channel cannot be received)
Accordingly, the present invention provides a control channel search method and a mobile communication device in a mobile communication system in which a control channel monitor cycle can be largely variably controlled, battery current consumption is reduced, and long-term operation is possible. The purpose is.

[0008]

In order to achieve the above object, a control channel search method in a mobile communication system according to the present invention changes a control channel monitor period to search for a control channel. Judgment of the timeout of the cycle, and then, after the timeout, a control channel monitor process is performed, and in this process, it is determined whether the mobile station is moving out of the service area of the base station. It is determined whether the movement to the first out-of-service area where the channel is receivable and does not satisfy the standby zone selection level or the movement to the second out-of-service area where the control channel cannot be received. In the case of moving to the area outside the second area, the control is variably controlled so that the control channel monitor period becomes longer than that when moving to the area outside the first area.

In the first out-of-service area, the control channel monitor period (Tma) during normal operation is maintained, and in the second out-of-service area, the control channel monitor period (Tma) is maintained.
The control channel monitor period (Tmb) is set to be longer than the control channel monitor period (Tmb) in the first non-coverage area, and the control channel monitor period (Tmb) is set to be longer than the control channel monitor period (Tma) in the normal operation. In the area outside the two service areas, the control channel monitoring period (Tmc) is set to be longer than the control channel monitoring period (Tmb).

A portable communication device in a mobile communication system according to the present invention changes a control channel monitoring period to search for a control channel, and includes a wireless communication means, a call processing means, a call control means, a transmission / reception means, and When the display control means is provided, and the call control means executes a control channel monitoring process after a timeout of the control channel monitoring period, and when the call control unit identifies the movement to the second non-service area where the control channel cannot be received, The first control channel is receivable and does not satisfy the standby zone selection level.
This is a configuration in which the control is variably controlled so that the control channel monitor cycle is longer than the out-of-service area.

In the first out-of-service area, the control channel monitor period (Tma) during normal operation is maintained, and in the second out-of-service area, a control channel monitor period (Tmb) larger than the control channel monitor period (Tma) is set. Alternatively, in the first out-of-service area, the control channel monitor cycle (Tmb) is set to be longer than the control channel monitor cycle (Tma) in normal operation, and in the second out-of-service area, the control channel monitor cycle (Tmb) is set. The control channel monitor cycle (Tmc) is set to be longer than the control channel monitor cycle (Tmc), and a storage medium storing information of the control channel monitor cycle (Tmb, Tmc) in advance is provided in the call control means.
The information of the control channel monitor cycle (Tmb, Tmc) is changed and set from the display operation means to the call control means. Further, the control channel monitoring period (Tmb, T
mc) is variably controlled by the call control means so as to gradually increase with time within the set time.

[0012] As the wireless communication means, at least a wireless receiver for receiving a wireless signal from a base station and outputting a signal by processing including high frequency amplification, frequency conversion, and intermediate frequency amplification, and transmitting a wireless signal to the base station. And a synthesizer for determining a transmission / reception frequency in the radio reception unit and the radio transmission unit, and the speech processing unit includes at least a time division unit. A time-division multiplexing connection circuit for performing connection by a time slot in the multiplexing connection, a modulation / demodulation circuit for performing modulation and demodulation between the radio reception unit and the radio transmission unit and the time-division multiplexing connection circuit, and a modulation / demodulation circuit. A codec circuit that decodes the received signal of the received signal and decodes the transmitted signal to the modulation / demodulation circuit, and receives the signal based on the signal from the wireless receiving unit. A reception electric field strength detection circuit for detecting the field strength and outputting the same to the call control means, and further comprising, as the call control means, at least control for a radio telephone by TDMA including determination of out-of-service or in-service and a control channel monitor. And a memory for storing information of a control channel monitor cycle, and at least a telephone microphone and a speaker as the transmission / reception means, and at least a ring tone as a display operation means. , A liquid crystal display that displays information including the reception status, transmitted and received telephone numbers, and input operations including information on power on or off, on or off hook, function selection and telephone number, and control channel monitoring period. And a light emitting diode for displaying the incoming call by blinking. That.

In the control channel search method and the portable communication device in the mobile communication system according to the present invention, the reception state of the control channel is determined when the mobile communication system moves out of the service area. That is, it is determined whether the mobile station moves to the first out-of-service area where the control channel is receivable and does not satisfy the standby zone selection level or moves to the second out-of-service area where the control channel cannot be received. The control is variably controlled so that the control channel monitor period becomes longer when moving to the second out-of-service area than in the out-of-service area. As a result, the current consumption of the battery decreases, and long-term operation becomes possible.

Further, in the portable communication device in the mobile communication system of the present invention, the first out-of-service area is kept at the control channel monitor period (Tma) during normal operation, and the second out-of-service area is set as the control channel monitor period (Tma). ) Is set to a control channel monitor cycle (Tmb) that is larger than the control channel monitor cycle (Tmb). Alternatively, the first out-of-service area is set to a control channel monitor cycle (Tmb) longer than the control channel monitor cycle (Tma) in normal operation, and the second out-of-service area is set to:
The control channel monitor period (Tmc) is set to be longer than the control channel monitor period (Tmb). Further, the call control means variably controls the control channel monitor period (Tmb, Tmc) so that the control channel monitor period (Tmb, Tmc) increases gradually (sequentially) with time within the set time.

As a result, it is possible to set various control channel monitoring periods in consideration of the possibility of capturing the control channel depending on the arrangement state of the service area (cell), the capacity of the battery and the usability of the user. Thus, it is possible to design in consideration of various network operating environments. In other words, the degree of freedom in designing the mobile communication network and the mobile terminal is improved.

In the portable communication device in the mobile communication system according to the present invention, the control channel monitor period (Tmb,
The information of Tmc) is stored in a storage medium in advance or changed and set by an input operation. As a result, various network operating environments, that is, service areas (cells)
It is possible to set various types of control channel monitoring periods that can respond to the possibility of capturing control channels depending on the arrangement state of the control channels. Also, the degree of freedom in designing the mobile terminal is improved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a control channel search method and a portable communication device in a mobile communication system according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of a mobile communication device in the mobile communication system of the present invention. In FIG. 1, this portable communication device (mobile terminal) is a PDC or PDC adopting the TDMA system.
This is a basic configuration of a mobile phone in the HS, and includes an antenna duplexer (duplexer) 1 for sharing an antenna for performing radio transmission and reception with a cell base station (not shown), a radio signal from the cell base station, high-frequency amplification, Frequency conversion,
A radio receiving unit 2 that outputs an IF signal by processing such as intermediate frequency (IF) amplification and automatic gain control (AGC), and a radio transmitting unit 3 that performs frequency conversion and power amplification for transmitting a radio signal to a cell base station. Have. In some cases, the antenna duplexer 1 is not used.

Further, the mobile terminal includes, for example, a modulation / demodulation circuit 4 for modulating and demodulating a π / 4 phase-shifted QPSK signal between the radio reception unit 2 and the radio transmission unit 3, and a time division multiplexing connection. A time-division multiplexing connection (TDMA) circuit 5 for performing transmission / reception connection in a time slot, and a codec (C) for decoding a reception signal and encoding a transmission signal
ODEC) circuit 6 and a microphone 7 for transmitting a transmission signal from the modulation and demodulation circuit 4 and a speaker 8 for transmitting a reception signal to the modulation and demodulation circuit 4 as voice.
A reception field strength detection (RSSI) circuit 9 for detecting an IF signal or the like from the wireless reception unit 2 and detecting a reception field strength is provided.

The mobile terminal includes a high-speed switching synthesizer (DLPS) 10 for determining a transmission / reception frequency in the radio reception unit 2 and the radio transmission unit 3, and a TD for each unit.
The control unit 11 that executes processing control related to the MA radio telephone, and particularly variably controls the control channel monitoring period according to the out-of-service / out-of-service determination and control channel reception state outside the service range according to the present invention. Have. In addition, it has a ringer 12 that sounds a ringing tone, and a liquid crystal display (LCD) 13 that displays a reception state, a transmission / reception telephone number, and various processes. The reception state of the control channel may be a movement to a first out-of-service area (out-of-service area OA1) that does not satisfy a reception zone selection level described below in detail or a second out-of-service area (out-of-service area OA2) in which a control channel cannot be received. ).

Further, the mobile terminal has an input operation unit 14 for performing a selection input operation including information of power on or off, on or off hook, function, telephone number and control channel monitoring period, and blinks an incoming call. And a control channel monitor cycle information variably controlled according to the out-of-service / out-of-service determination and the control channel reception state outside of the service area. A memory 17 is provided to overwrite and store the information of the channel monitor cycle when the setting is changed from the input operation unit 14.

The mobile terminal includes a battery (not shown) for supplying power to each unit (for example, a lithium ion battery,
Lithium polymer battery). In addition, an incoming call vibrator, an incoming call wireless notification device, and the like may be provided, but illustration and description thereof are omitted here.

Next, the operation of the embodiment will be described.
First, the basic operation of the mobile terminal shown in FIG. 1 will be described. As described above, when the mobile terminal turns on the power, for example, the RCR (ARIB) -ST in the PHS
Execute a location registration sequence according to the D-28 standard. In this case, the IF signal from the wireless reception unit 2 is detected by the reception electric field strength detection circuit 9, and the position registration is performed through the cell base station having the maximum reception electric field strength under the control of the control unit 11.

At the time of transmission thereafter, after the off-hook on the input operation unit 14, the PDC, P
A telephone number (address) in HS, ISDN, PSTN or the like is input. This telephone number selection signal is transmitted to the cell base station through the wireless transmission unit 3 and the antenna duplexer 1. In this case, an exchange / control station (not shown) checks a database (subscriber file) and allocates a communication channel. That is, a communication channel obtained by dividing a frame of a fixed time cycle in TDMA at a plurality of time intervals (time slots) is allocated.

The switching and control station serves as a service switching point (SSP: Service) in an intelligent mobile telecommunications network based on ITU-T recommendations.
Switching point / switching node), and a service control point that is composed of a computer and a database for service control, etc., and controls various mobile phone services (for example, location information, call availability information and transfer, and additional services such as answering machine). (SCP: Service Control point / control node). It is connected to a network by a common channel signaling method between seven stations, and transfers a mobile application part (MAP) signal for providing services related to various types of mobile telephones.

A telephone exchange connection sequence (selection signal reception, number translation, outgoing line selection link selection, call signal transmission, response detection, call path closing) through the exchange / control station is executed by this communication channel. A transmission signal from the microphone 7 by transmission is encoded by the codec circuit 6, and transmitted through the time-division multiplexing circuit 5 to the transmission signal placed on the assigned time slot by the modulation / demodulation circuit 4.
Quadrature modulation is performed on a phase-shifted QPSK signal or the like. The modulated wave is wirelessly transmitted through the wireless transmission unit 3, the antenna duplexer 1, and the antenna.

The π / 4 phase-shifted QPSK signal from the switching / control station and the π / 4 phase-shifted QPSK signal from the connection destination through the antenna, the antenna duplexer 1 and the radio receiver 2 are subjected to quadrature conversion (I / The signal is decoded by the codec circuit 6 through the time-division multiplexing circuit 5 and output from the speaker 8 as audio. When the control unit 11 captures the detection of the end of the call, the restoration of the call path is controlled through the switching and control station.

At the time of receiving a call to the mobile terminal, the switching and control station checks a database (subscriber file) or the like based on the transmission of the selection signal (telephone number) after off-hook from the telephone device and calls it. Check the mobile terminal of the destination (connection destination). Thereafter, simultaneous paging is performed from a plurality of cell base stations including the parked service area of the terminal device through common control. The mobile terminal identifies the received call signal,
Send a response signal. The switching / control station determines a cell base station to be connected to the radio channel, and further allocates a communication channel to perform the call. The operation of the mobile terminal is the same as that at the time of calling.

Hereinafter, the reception state of the control channel outside the service area (the area OA1 (the first outside area) which is receivable and does not satisfy the standby zone selection level), or
The operation of variably controlling the control channel monitor cycle in response to the movement to the out-of-service area OA2 (the second out-of-service area) where the control channel cannot be received will be described.

FIG. 2 is a diagram for explaining the movement position of the mobile terminal with respect to the cell base station, and FIG. 3 is a timing chart in a state where the control channel monitor period is variably controlled. FIG. 4 is a flowchart showing a processing procedure of an operation of variably controlling the control channel monitor cycle. In FIG. 2, the mobile terminal MS shown in FIG. 1 has moved from the service area SA of the cell base station BS to an out-of-service area OA1 where a wireless communication line connection is not possible. Here, the out-of-service area OA1 is an area where the control channel can be received and does not satisfy the standby zone selection level. The out-of-service OA2 is an area where a control channel cannot be received.

In FIG. 1 to FIG. 4, information of the control channel monitoring period (Tmb, Tmc described below) for each moved out-of-service OA1 or out-of-service OA2 is stored in the memory 17 in advance. The control channel monitor cycle stored in the memory 17 can be changed and set from the input operation unit 14.

When the mobile terminal MS is located within the service area SA of the cell base station BS shown in FIG. 2, the reception electric field strengths of the communicating carrier and the carriers of the surrounding cells are calculated by the reception electric field strength of FIG. The detection circuit 9 detects from an IF signal output from the wireless reception unit 2 or the like. Based on the detection of the received electric field strength, for example, a control channel (ACCH: Associated Control Channel) attached to an information channel (TCH: Traffic Channel) during communication of handover.
To periodically notify the cell base station BS to execute. In the control channel monitor in this case, as shown in FIG. 3A, the control channel monitor section is continuously repeated at a control channel monitor period Tma.

Here, the control unit 1 indicates that the mobile terminal MS moves from the service area SA of the cell base station BS to the out-of-service area OA1 or the out-of-service area OA2 and cannot receive the control channel.
1 recognizes. Then, when the control channel period times out (step (S) 1), the control unit 11
Controls the radio reception unit 2, the time division multiplexing circuit 5, and the like to execute a control channel monitoring process (S2). Next, from the control channel monitoring process, the control unit 11 sends the out-of-service OA1
Alternatively, the movement to the out-of-service OA2 is determined (S3). If it is not a move to out-of-service OA1 or out-of-service OA2 in this determination (S
3: No), control channel establishment processing is executed, and the process returns (S4).

In the case of movement to out-of-service area OA1 or out-of-service area OA2 in step S3 (Yes), control unit 11 further determines whether the movement is to out-of-service area OA1. That is, it is determined whether the control channel is receivable, the electric field is a weak electric field that does not satisfy the standby zone selection level, and the base station is detectable (S5). Out of service OA1 in this step S5
In the case of (Yes), the control channel monitor period Tma in the normal operation is left as it is, and the process returns. That is, at the position of the out-of-service area OA1, there is a high possibility that the wireless channel is connected to another cell base station BS. Therefore, the control channel monitoring period Tma in the normal operation is continued as shown in FIG.

If it is determined in step S5 that the base station cannot be detected in a weak electric field (No), the control unit 11 controls the control channel monitor period Tm during normal operation as shown in FIG.
The control channel monitoring period Tmb is set to be larger than a. That is, it is determined that the possibility of wireless line connection with another cell base station BS is small, and the control channel monitor period T
The control is variably controlled to a control channel monitor period Tmb larger than ma (S6).

Next, a specific example will be described.
The control channel monitoring period Tma during normal operation is 2 s, and the large control channel monitoring period Tm in out-of-service OA2
When the mobile terminal MS where b is 5 s is compared with a comparative mobile terminal in which the control channel monitoring period Tma continues at 2 s even in the out-of-service OA2, the following good results are obtained.

(1) Common conditions Control channel monitor section shown in FIG. 3: 120 ms Current consumption in control channel monitor section: 10 mAh Dark current: 0.4 mAh (2) Current consumption Mobile terminal MS: 0.64 mAh Comparative mobile terminal: 1 mAh (3) Reception standby time when using a 400 mAh battery Mobile terminal MS: about 625 hours Comparative mobile terminal: about 400 hours

As described above, the mobile terminal MS that sets the control channel monitoring period Tmb in the out-of-service area OA2 to 5 s has a reduced current consumption. For example, when a 400 mAh battery is used, the mobile terminal MS is less than the comparative mobile terminal. Therefore, the reception standby time increases by about 1.5 times, and the call time also increases.

Next, another variable control of the control channel monitor cycle will be described. FIG. 5 is a timing chart showing a state in which another control channel monitor cycle is variably controlled.
FIG. 6 is a flowchart showing a processing procedure of another operation for variably controlling the control channel monitor period.

In FIG. 1, FIG. 2, FIG. 5, and FIG. 6, the user moves to the out-of-service area OA1 or the out-of-service area
When the control unit 11 recognizes that the control channel signal cannot be received, the control channel period times out (step (S) 11), and then a control channel monitoring process is executed (S12). In addition, when the control unit 11 does not move to the out-of-service OA1 or the out-of-service OA2 (S13: No), the control unit 11 executes a process of establishing a control channel and returns (S1).
4).

In the case of movement to the out-of-service area OA1 or out-of-service area OA2 (S13: Yes), the control unit 11 transmits the out-of-service area OA1.
Move to, i.e., the control channel is receivable,
In addition, it is determined whether or not the base station can detect a weak electric field that does not satisfy the standby zone selection level (S15). In the case of out-of-service OA1 in this step S15 (Yes), the control unit 11
Is set to the control channel monitor period Tmb shown in FIG. 5B, which is larger than the control channel monitor period Tma in the normal operation shown in FIG. 5A (T16) (S16). ). That is, in the out-of-service OA1, there is a high possibility that a wireless channel is connected to another cell base station BS, so that the control channel monitor cycle Tmb is set to be slightly longer than the control channel monitor cycle Tma in the normal operation.

If the base station cannot be detected in step S15 (No), the control channel monitor period T larger than the control channel monitor period Tmb as shown in FIG.
mc. That is, it is determined that the possibility of capturing a control channel with another cell base station BS is small, and the control is variably controlled to a control channel monitor period Tmc that is longer than the control channel monitor period Tmb (S17).

As described above, in another embodiment, out-of-service OA
In the case of movement to 1, the control channel monitor period (T
mb) is the control channel monitor period Tma during normal operation.
The control channel monitor cycle (Tmc) is set to be longer than the control channel monitor cycle Tmb in the case of movement to the out-of-service OA2. As a result,
Furthermore, the current consumption is further reduced as compared with the above-described embodiment, and a longer operation time (reception standby time, talk time)
Is obtained.

The control channel monitor period Tm
b and Tmc are determined in consideration of the network operating environment. For example, when the control channel monitoring periods Tmb and Tmc are reduced, the time required for capturing the control channel can be reduced although the effect of reducing the current consumption of the battery is small. When the control channel monitor periods Tmb and Tmc are increased, the opposite occurs. The control channel monitoring periods Tmb and Tmc are determined in consideration of these factors and the possibility of capturing the control channel depending on the arrangement state of the service area (cell) and the usability of the user.

In this embodiment, the control channel monitor periods Tmb and Tmc are fixedly stored in the memory 17 in advance. However, the control channel monitor periods Tmb and Tmc can be changed by the operation of the input operation unit 14 and the control program of the control unit 11. You may do it. Further, the control channel monitor periods Tmb, Tm
As for c, the control program of the control unit 11 may change and control the cycle so that the cycle gradually increases (sequentially) with time within a certain set time without setting the cycle to a fixed state.

In this embodiment, the TDMA system and the π / 4 phase-shifted Q-PSK modulation system have been described. However, the present invention can be applied to any mobile communication (telephone) network that scans and acquires a control channel. It is. FD
It is also applicable to the MA system and the CDMA system. Also, B
-PSK, GMSK (Minimum Shift Keying), 16QA
A modulation method such as M may be used.

[0046]

As is apparent from the above description, according to the control channel searching method and the portable communication device in the mobile communication system of the present invention, when the mobile terminal moves to the second out-of-service area where the control channel cannot be received, the control channel is switched. Variable control is performed so that the control channel monitoring period is longer than that of the first out-of-service area that is receivable and does not satisfy the standby zone selection level. As a result, the current consumption of the battery decreases, and long-term operation becomes possible.

According to the control channel search method and the portable communication device in the mobile communication system of the present invention,
The out-of-service area is kept at the control channel monitor cycle (Tma) in the normal operation, and the second out-of-service area is set to the control channel monitor cycle (Tmb) larger than the control channel monitor cycle (Tma). Alternatively, the first out-of-service area is set to a control channel monitoring period (Tma) during normal operation.
The control channel monitor period (Tmb) is set to be longer than the control channel monitor period (Tmb), and the second out-of-service area is set to a control channel monitor period (Tm) longer than the control channel monitor period (Tmb).
c). Further, the call control means variably controls the control channel monitor period (Tmb, Tmc) so that the control channel monitor period (Tmb, Tmc) increases gradually (sequentially) with time within the set time.

As a result, various control channel monitoring periods can be set in consideration of the possibility of capturing the control channel depending on the arrangement state of the service area, the capacity of the battery, the usability of the user, and the like. It is possible to design in consideration of the network operation environment. In other words, the degree of freedom in designing the mobile communication network and the mobile terminal is improved.

According to the portable communication device in the mobile communication system of the present invention, the control channel monitor period (Tm
b, Tmc) is stored in a storage medium in advance, or
Changed by input operation. As a result, it is possible to set various control channel monitoring periods that can cope with the possibility of capturing a control channel depending on various network operating environments, that is, the arrangement state of service areas (cells), and to design mobile terminals freely. The degree will be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a mobile communication device in a mobile communication system of the present invention.

FIG. 2 is a diagram illustrating a moving state of a mobile terminal with respect to a cell base station in the embodiment.

FIG. 3 is a timing chart showing a state in which a control channel monitor cycle is variably controlled in the embodiment.

FIG. 4 is a flowchart showing a processing procedure of an operation for variably controlling a control channel monitor cycle in the embodiment.

FIG. 5 is a timing chart showing a state in which another control channel monitor cycle is variably controlled in the embodiment.

FIG. 6 is a flowchart illustrating a processing procedure of an operation of variably controlling another control channel monitor cycle in the embodiment.

FIG. 7 is a diagram for explaining a conventional control channel monitoring cycle.

[Explanation of symbols]

 2 Radio receiving unit 5 Time division multiplexing connection circuit 9 Received electric field strength detection circuit 11 Control unit 14 Input operation unit 17 Memory BS Cell base station MS Mobile terminal OA1, OA2 Out of service area SA Service area

Claims (10)

[Claims] 1. A control channel search method in a mobile communication system in which a control channel is searched by changing a control channel monitor period, a timeout of the control channel monitor period is determined, and a control channel monitor process is executed after the timeout. In this process, it is determined whether or not the mobile station is moving out of the service area of the base station. In the case of the mobile station being out of the service area, the control channel is receivable and the first mobile station that does not satisfy the standby zone selection level is determined. It is determined whether to move to the out-of-service area or to the second out-of-service area where the control channel cannot be received. Control channel in a mobile communication system, wherein the control channel is variably controlled so that a control channel monitor period becomes longer than a period of time. Search method. 2. The control channel search method according to claim 1, wherein the control channel monitor period (Tma) during the normal operation is maintained in the first out-of-service area, and the control channel monitor period (Tma) in the second out-of-service area. The control channel monitor period (Tmb) is set to be longer than the control channel monitor period (Tmb), or the control channel monitor period (Tmb) is set to be longer than the control channel monitor period (Tma) in the normal operation in the first non-service area. In the area outside the 2 area,
A control channel search method in a mobile communication system, wherein the control channel monitoring period (Tmc) is set to be longer than the control channel monitoring period (Tmb). 3. A portable communication device in a mobile communication system for searching for a control channel by changing a control channel monitoring period, comprising: a wireless communication unit, a call processing unit, a call control unit, a transmission / reception unit, and a display operation unit. When the call control means executes a control channel monitor process after a timeout of the control channel monitor period, and identifies that the call is a movement to a second out-of-service area where the control channel cannot be received, the control channel is received. The first that is possible and does not satisfy the standby zone selection level
A mobile communication device in a mobile communication system, wherein variable control is performed such that a control channel monitor cycle is longer than an out-of-service area. 4. The mobile communication device according to claim 3, wherein the control channel monitoring period (Tma) during normal operation is maintained in the first out-of-service area, and the control channel monitoring period (Tma) in the second out-of-service area. Is set to a larger control channel monitor period (Tmb), or in the first out-of-service area, the control channel monitor period (Tmb) is set to be larger than the control channel monitor period (Tma) at the time of the normal operation. In areas outside the service area,
The control channel monitor period (Tmc) is set to be longer than the control channel monitor period (Tmb), and a storage medium storing information of the control channel monitor period (Tmb, Tmc) in advance is provided in the call control means. Mobile communication device in a mobile communication system. 5. The portable communication device according to claim 4, wherein the information of the control channel monitor cycle (Tmb, Tmc) is
A portable communication device in a mobile communication system, wherein the setting is changed from display operation means to call control means. 6. The portable communication device according to claim 4, wherein the call control means variably controls the control channel monitor period (Tmb, Tmc) so as to gradually increase with time within a set time. A portable communication device in a mobile communication system. 7. The wireless communication unit, as the wireless communication unit, receiving at least a wireless signal from the base station and outputting a signal obtained by processing including high-frequency amplification, frequency conversion, and intermediate-frequency amplification; A wireless transmitter for performing a process including frequency conversion and power amplification for transmitting a wireless signal, and a synthesizer for determining a transmission / reception frequency in the wireless receiver and the wireless transmitter. 4. A mobile communication device in the mobile communication system according to 3. 8. A time-division multiplexing connection circuit for making a connection by a time slot in the time-division multiplexing connection, a radio reception unit and a radio transmission unit, and a time-division multiplexing connection circuit as the call processing means. A modulation and demodulation circuit that performs modulation and demodulation between the signal, a codec circuit that decodes a reception signal from the modulation and demodulation circuit, and a transmission signal to the modulation and demodulation circuit, and a signal from a radio reception unit. 4. The portable communication device in a mobile communication system according to claim 3, further comprising: a reception field strength detection circuit that detects a reception field strength and outputs the received field strength to a call control unit. 9. A TD including at least out-of-service or in-service determination and a control channel monitor as the call control means.
4. The mobile communication device according to claim 3, further comprising: a control unit configured to execute a control on the radio telephone by the MA; and a memory configured to store information on a control channel monitoring period. 10. The transmitting / receiving means includes at least a microphone and a speaker for a call, and the display operation means performs display including at least a ringer that sounds a ringing tone, a reception state, and a transmission / reception telephone number. A liquid crystal display, an input operation unit for performing input operations including power on / off, on / off hook, function selection and telephone number input, and information on a control channel monitoring cycle, and a flashing light for displaying an incoming call flashing The mobile communication device according to claim 3, further comprising: a diode.