JPH09215040A - Out-of-zone waiting method for mobile communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time of transition from an out-of-zone state into a waiting state. SOLUTION: When a mobile station is set in the waiting state, a controller inside the mobile station registers whether the mobile station waits in a home mobile communication network or an a roam mobile communication network and when the mobile station turns into an out-of-zone state later, a catch operation A for a control channel to be waited in the home mobile communication network and a catch operation B for a control channel to be waited in the rome mobile communication network are executed while being switched. In this case, the catch operation for the control channel to be waited in the mobile communication network is preferentially executed on the side, where the mobile station is waited just before, between the home entrepreneur mobile communication network and the roam mobile communication network.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication out-of-service waiting method, and in particular, a mobile station is permitted to roam although the mobile service is subscribed by a home carrier mobile communication network to which the mobile station subscribes. The present invention relates to an out-of-service standby method for mobile communication that can be used in both existing ROHM mobile communication networks.

[0002]

2. Description of the Related Art In recent years, the standard connection for call connection by mobile phones, which has become extremely popular, is published by "Radio System Development Center," Digital Car Phone System Standard
RCRSTD-27 Formulated on April 30, 1991, and referring to the respective revised editions A to D), the explanation will be as follows. A large number of reception carrier frequencies are assigned to mobile communication, and in the case of a three-channel multiplex TDMA system, many reception carriers have a set of slots 2 and 5 of a reception frame in which the mobile station receives various control information from the base station. Form a control channel. The frequency of the main reception carrier whose set of slots 2 and 5 of the reception frame is the control channel is called the perch frequency, and is stored in the memory of the mobile station as a clue to search for the standby control channel when the power is turned on or out of range. I remember. The set of slots 2 and 5 of the received frame at the perch frequency is called the perch channel. After the power is turned on, the mobile station performs perch channel scanning and standby channel selection operations to capture the standby control channel and enter the standby state (standby transition). First, for the mobile communication network, tune to each perch frequency in sequence and search for a perch channel with a reception level above the specified value (perch channel scan), then tune to the perch channel in descending order of reception level and start standby Whether or not the conditions are satisfied is determined (starting conditions will be described later), and the perch channel when all standby starting conditions are satisfied (or another control channel when another control channel is specified by the control information) Is the standby control channel (standby channel selection operation). And
If necessary, it requests the mobile communication network for location registration. The mobile communication network responds to the incoming call through the paging channel (paging channel) PCH among the standby control channels, and switches to the traffic channel (information channel) TCH designated by the single cell channel (dedicated cell channel) SCCH. , Emit a ringing tone.
The call path is set off-hook (incoming call). When the mobile station in the standby state goes off-hook, it makes a call request after confirming the availability of the SCCH, and if there is a response, it switches to the TCH designated by the SCCH, and after transmitting the dial signal, the communication path is set up. (Calling). When the mobile station or the base station (network side) goes on-hook during a call or the reception level falls below a predetermined prescribed value, the call ending process is performed and the original waiting control channel is waited for (call ending).

When the reception level from the base station in the existing zone falls below the standby deterioration level during standby and the reception level from the base stations in the peripheral zones also falls below the standby permission level, it is assumed that the mobile communication network is out of the service area. The mobile station acquires a new standby control channel (outside service standby).
Specifically, first, the perch frequency stored in the memory is scanned, the perch channel whose reception level is equal to or higher than a specified value is associated with the reception level, and the channel is stored as a selection channel (perch channel scan). Next, this time, tuning, synchronization establishment, error detection / correction, while tuning the selection channels stored in the memory in descending order of reception level,
The reception level is detected and the broadcast channel (broadcast information channel) BCCH is received. And OSI (Op
Layer 1 which is a physical layer of a wireless section signaling system between a mobile station and a base station viewed in a 7-layer model of en Systems Interconnection (a layer that guarantees transmission of a bit string using a communication circuit using electromagnetic waves as a physical transmission medium). , Which establishes synchronization between the frame and superframe, performs color code detection and scrambler activation, error detection / correction, etc.) is working normally, whether BCCH reception is completed, and the reception level is higher than the standby permission level. If the perch channel becomes larger or larger (above, standby activation condition) and all the perch channels are satisfied, it enters the standby state as the standby control channel (switches if the standby control channel determined by the BCCH control channel structure information is different). . If layer 1 does not work normally or the reception level becomes lower than the standby permission level for all the selection channels stored in the memory this time, the process returns to the perch channel scan. In this way, in the standby state, the standby control channel transmitted from the nearest base station with the highest reception level in the mobile communication network can be caught, and communication with the base station can be executed with low power (standby control The BCCH of the channel receives the standby permission level, the identification information of the mobile communication network, the location registration area number, the control channel structure information, the regulation information, and the PCH receives the incoming call signal).

[0004]

By the way, the mobile station is
If use is permitted in any other carrier mobile communication network that does not have a direct subscription contract (roaming, the other carrier mobile communication network is called a roam carrier mobile communication network),
When it goes out of range, it is not known which of the home carrier mobile communication network and the roam carrier mobile communication network can be captured. Therefore, the control channel acquisition operation and the roam carrier mobile communication that the home carrier mobile communication network should wait for It has to do both the acquisition operation of the control channel to be listened to in the network. At this time, as shown in FIG. 9, if the capture operation in the home carrier mobile communication network is always prioritized, the user is in the service area of the roam carrier mobile communication network and the roam carrier mobile communication is performed. Even if it recovers immediately after it has gone out of range due to a radio wave interference while waiting on the network, it will wait on the roam carrier's mobile communication network after performing the control channel acquisition operation on the home carrier's mobile communication network first. Since the control channel capturing operation is performed, the time required for the transition from the out-of-range state to the standby state becomes very long, and the user has to wait a long time before being able to make a call. The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide an out-of-range standby method for mobile communication in which the transition time from the out-of-range state to the standby state is shortened.

[0005]

In the mobile communication out-of-service standby method of the present invention, a mobile station is a home carrier mobile communication network to which the mobile station subscribes and a roam carrier move permitted to roam. In mobile communication that is used in any of the communication networks, when the mobile station is in the standby state, the home operator mobile communication network or the ROHM operator mobile communication network is registered in the mobile station, and then the mobile station is registered. When the station goes out of service, the home operator mobile communication network switches between the control channel acquisition operation to wait for and the ROHM operator mobile communication network to wait for the control channel. Of the mobile communication network and the ROHM operator mobile communication network, the control channel acquisition operation that should be waited for in the mobile communication network that was waiting immediately before is performed with priority. And so, when it is captured in the control channel, it was to shift to the standby state is characterized.

In another mobile communication out-of-range standby method of the present invention, the mobile station is either a home carrier mobile communication network to which the mobile station subscribes or a roam carrier mobile communication network permitted to roam. However, in mobile communication that is in use, when the mobile station is in the standby state, it is registered whether the home operator mobile communication network or the roam operator mobile communication network is in the mobile station, and then the mobile station is out of range. In this case, the operation to capture the control channel to wait for in the home carrier mobile communication network and the operation to capture the control channel to wait in the roam carrier mobile communication network are switched and executed. ROHM carrier Highly frequently and preferentially executes the control channel acquisition operation that should be awaited in the mobile communication network on the side that was waiting immediately before in the mobile communication network. And so, when it is captured in the control channel, it was to shift to the standby state is characterized.

[0007]

According to the out-of-service standby method for mobile communication of the present invention, when the mobile station is in the standby state, it is registered in the mobile station which of the home carrier mobile communication network and the roam carrier mobile communication network is waiting. After that, when the mobile station goes out of range, it switches between the control channel acquisition operation to wait for the home carrier mobile communication network and the control channel acquisition operation to wait for the roam carrier mobile communication network. At this time, of the home carrier mobile communication network and the roam carrier mobile communication network, the control channel capture operation that should be awaited by the mobile communication network on the side that was waiting immediately before is preferentially executed so that the control channel is captured. When it is possible, it shifts to the standby state. When an out-of-range condition occurs due to radio interference, etc., it is considered that the user is on the side of the home carrier mobile communication network and the roam carrier mobile communication network that was waiting immediately before, but Since the control channel of the mobile communication network is prioritized and executed first, when the radio interference is recovered in a short time, the transition time from the out-of-range state to the standby state can be shortened. Whether the user is in the home carrier mobile communication network or the roam carrier mobile communication network, there is no long waiting time before the user can make a call. Further, even when the user moves to the mobile communication network of the business operator on the opposite side to the one that was waiting immediately before, the control channel of the mobile communication network of the business operator can be surely acquired.

According to another out-of-service waiting method for mobile communication of the present invention, when the mobile station is in a waiting state, which of the home operator mobile communication network and the roam operator mobile communication network is waiting in the mobile station is registered. After that, when the mobile station goes out of service, the control channel acquisition operation for the home carrier mobile communication network and the control channel acquisition operation for the ROHM carrier mobile communication network are switched and executed. At this time, the control channel acquisition operation to be awaited in the mobile communication network on the side that has been waiting immediately before, among the home carrier mobile communication network and the roam carrier mobile communication network, is executed with high frequency and with priority. As a result, the control channel of the mobile communication network on the side that was waiting immediately before is prioritized and executed first.Therefore, when the radio interference is recovered in a short time, the transition time from the out-of-range state to the standby state can be set. It can be done in a short time, and there is no long waiting time until the user can make a call regardless of whether the user is in the home carrier mobile communication network or the roam carrier mobile communication network. In addition, even if the radio interference continues to some extent, the control channel of the mobile communication network on the side that has been waiting immediately before is frequently captured, so after the radio interference is recovered, the device waits immediately before the standby. There is a high probability that the control channel of the mobile communication network on the receiving side will be captured, and the transition to the standby state can be performed quickly. Further, even when the user moves to the mobile communication network of the business operator on the opposite side to the one that was waiting immediately before, the control channel of the mobile communication network of the business operator can be surely acquired.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Overall Configuration FIG. 1 is a block diagram showing the configuration of a mobile station (cellular phone) embodying an out-of-service waiting method for mobile communication according to the present invention. Here, the mobile station is divided into a home carrier mobile communication network (hereinafter referred to as a home network) to which the mobile station subscribes and a roam carrier mobile communication network (hereinafter referred to as a roam network) permitted to roam. Either can be used. 1
Is equipped with various keys such as a power key, off-hook key, dial key, etc., and an operation / display unit equipped with a display for performing various displays such as out-of-range display, reception level display, dial display, battery exhaustion display, 2 is a microphone, 3 is a speaker, 4 is a voice encoder / decoder (CODEC), 5 is an antenna, 6
Is a radio unit (RFU), and a duplexer 6A, a receiving circuit 6B for amplifying, frequency converting, and IF amplifying an antenna received signal, a demodulator (π / 4 shift QPSK demodulator) 6
C, a modulator (π / 4 shift QPSK modulator) 6D, a transmission circuit 6E that performs frequency conversion and power amplification of the modulator output, and a frequency synthesizer 6F that outputs a local oscillation signal for frequency conversion and the like. When performing intermittent reception, the power supply of each circuit except the transmission system circuits (modulator 6D and transmission circuit 6E) of the wireless unit 6 is intermittently turned on under the control of the controller described later. The power of the transmission system circuit is turned on only when transmission is necessary. A reception level detector (not shown) is also incorporated in the reception circuit 6B.

Reference numeral 7 denotes a TDMA circuit (time division multiplexing / demultiplexing circuit), which combines information data such as transmission control channel data and voice data with a synchronization word and stores them in a predetermined time slot in a TDMA frame. Burst output to modulator 6D or TDMA input from demodulator 6C
A necessary time slot is extracted from the frame, frame synchronization and superframe synchronization are performed, color code detection, scrambler activation, error detection / correction, etc. are performed, and control channel data and voice data are output separately. This TDMA circuit 7 has a function of detecting the synchronization between the frame and the superframe for the received slot, error detection /
It also has a function of detecting whether the correction is normal. Reference numeral 8 denotes a controller composed of a microcomputer, which uses a program stored in a built-in memory, its own model number, the perch channel frequency of each of the home network and the roam network, and information for identifying the home network and the roam network. , By controlling each part of the mobile station and performing various judgment processes, power is turned on according to the operation of the power key, out-of-range standby for home network and roam network, normal standby after capturing the standby control channel, incoming call, off-hook key and dial Control processing such as call origination and call termination associated with key operation is executed while exchanging various control information with the base station.

In this embodiment, when waiting in the out-of-range state, the controller 8 preferentially controls the side of the home network and the roaming network that has been waiting immediately before and controls the capture operation of the control channel to be waited for. In other words, when waiting on the home network immediately before, as shown in FIG.
The power supply of the wireless unit 6 (excluding the transmission system circuit) is intermittently turned on while taking a _TY second pause period, and during each ON period, the operation of capturing the control channel to wait for the home network, the roam network The control channels to be waited are alternately switched once in the order of capturing operation. On the other hand, when waiting on the ROHM network immediately before, as shown in FIG. 2 (2), the wireless unit 6 takes a rest period of T _Y seconds.
Power is turned on intermittently (excluding the transmission system circuit), and during each ON period, the control operation of the control network to wait for the ROHM network and the control operation of the control channel to wait for the home network are performed once in this order. Alternately switch to perform. When out of service area, the user is considered to be on the side of the home network and the roaming network that was waiting immediately before, so when the radio wave interference recovers in a short time, the side that was waiting immediately before is given priority. By performing the control channel acquisition operation in this way, it is possible to shift to the original standby state in a short time.

FIG. 3 is a flow chart showing the processing after the power is turned on by the controller 8, FIG. 4 is a flow chart showing the out-of-range standby processing, and FIG. 5 is an explanatory diagram of the out-of-range standby operation. The out-of-service waiting operation of the embodiment will be described. Here, it is assumed that the frequency band of the home network and the frequency band of the roam network are different and the service areas are also different (see FIG. 5. Reference numerals Z ₁ and Z ₂ in the figure indicate mobile stations. ). In addition, the mobile station is permitted to be used in both the home network and the roam network, and T _Y = 2 seconds. The last network data that the controller 8 registers in the built-in memory as to whether the most recently awaited mobile communication network is the home network or the ROHM network is LN.

[0013] When the power key power-on operation / display unit 1 is pressed, the controller 8 (excluding transmitting circuit) radio unit 6, TDMA
The power of each part such as the circuit 7 is turned on (step S1), and the LN is set as a home network for convenience (step S2). next,
The acquisition operation of the control channel to be awaited in the home network is controlled (step S3). Specifically, the wireless unit 6
The receiver tuning control is performed on the home network, the perch frequency of the home network stored in the built-in memory is scanned, and the perch channel whose reception level is equal to or higher than the specified value is associated with the reception level and stored as the channel for selection (perch channel scan). ). Next, the TDMA circuit 7 establishes synchronization between the frame and the superframe, activates the scrambler, and performs error detection / correction while tuning the selection channel of this time in descending order of reception level, and outputs control channel data. . Then, (1) synchronization is detected by the TDMA circuit 7, error detection / correction is normally performed (layer 1 is normally operating), and (2) each information of the BCCH in the control channel. (Standby permission level, mobile communication network identification information, location registration area number, control channel structure information, regulation information, etc.) are correctly received,
(3) Standby such that the reception level is higher than the standby permission level defined by the BCCH, and (4) the identification information of the mobile communication network of the BCCH matches the identification information of the home network stored in the built-in memory. It is checked whether all the starting conditions are satisfied (step S4). When the mobile station is in a place where the radio waves of the home network can reach and all the stand-by activation conditions are satisfied, the LN is set as the home network again, and then the perch channel of this time enters the stand-by state as the control channel to be waited in the home network Steps S5 and S6). In addition,
At this time, when the BCCH is instructed to shift to another control channel, the control channel to shift to the other control channel is set as the standby control channel, and the standby state is entered. When an event such as an outgoing call or an incoming call occurs with the home network during standby, the controller 8 controls each unit according to the event such as predetermined outgoing call control and incoming call control.

If the answer is NO in step S4, then, the control channel to wait in the ROHM network is captured (step S7). This capturing operation is almost the same as in the case of the home network, except that the perch channel scan of the roam network is performed first, and (4) in the standby activation conditions of (1) to (4) is changed to (4). The difference is that the identification information of the mobile communication network of'BCCH is the same as the identification information of the roam network stored in the built-in memory. After that, the controller 8 checks whether all standby activation conditions are satisfied for the ROHM network (step S8).
If the mobile station is located in a place where the radio wave of the roam network can reach and all the stand-by activation conditions are satisfied, the mobile station shifts to the stand-by state after setting the LN to the roam network.

Out-of-service standby (see FIGS. 2 and 5) While waiting in the home network (LN = home network, Z _{1 in} FIG. 5)
When the reception level from the base station in the zone is below the standby deterioration level and the reception level from the base station in the peripheral zone is also below the standby permission level, the out-of-range standby in Figure 4 Go to processing. Here, first, the power supply of the reception system circuits (reception circuit 6B, demodulator 6C) of the wireless unit 6 is turned off only for T _Y = 2 seconds (the transmission system circuits remain in the power-off state), and the TDMA circuit 7
Is set as a standby mode which is a low power consumption mode and is suspended (step S11). Since the LN is the home network, it is determined in step S12 that the home network has been waiting immediately before, the process returns to step S3 in FIG. 3, and power is supplied to each part of the wireless unit 6 except the transmission system circuit. Then, the standby mode of the TDMA circuit 7 is released, and the control channel for waiting in the home network is acquired.
If it cannot be captured, it is determined as NO in step S4, and then the control channel to be waited for in the ROHM network is captured (step S7). If you can't catch here either,
When NO is determined in step S8, the process returns to the flow of FIG. 4, and thereafter, in the same manner, the home network and the home network are intermittently received until the control channel can be acquired in the home network or the roam network. The capture operation of the control channel to be waited for in the ROHM network is intermittently switched and executed (see FIG. 2 (1)). In this way, when the home network has been waiting immediately before and the service area is out of service, the home network is prioritized and the control channel acquisition operation is performed.

On the contrary, when the reception state of the radio wave deteriorates while waiting in the roaming network (LN = roaming network, see Z ₂ in FIG. 5) and the out-of-range waiting process is started, first, the T
_Y = rest for 2 seconds (step S11), step S1
In step 2, it is determined that the home network is the one that was waiting immediately before, and the process proceeds to step S13 to supply power to each part of the wireless unit 6 except the transmission system circuit, and to capture the control channel to wait in the roam network. . If it cannot be acquired, it is determined as NO in step S14, and subsequently, the operation of acquiring the control channel to be awaited in the home network is performed (step S1).
5). If it cannot be captured here either, N is returned in step S16.
When it is determined to be O, the process returns to step S11, and thereafter, similarly, until the control channel can be acquired in the roam network or the home network, the roam network and the home network wait while intermittently receiving in the 2-second pause period. The capturing operation of the power control channel is intermittently switched alternately and executed (see FIG. 2 (2)). In this way, when the roaming network waits immediately before and the service area goes out of service, the roaming network is prioritized and the control channel acquisition operation is performed.

Transition from out-of-service standby to normal standby
(Immediately wait on the home network) When the reception status is immediately restored after the mobile phone went out of service while waiting on the home network immediately before, the home network capture operation is performed earlier than the roam network. The control channel of the home network is acquired by the processing of step S3 in FIG. If all the standby conditions are satisfied, the system shifts to the standby state in the home network (steps S4 to S6. FIG. 2).
(See arrow E _{A in} (1)). As described above, by preferentially performing the capture operation on the home network, it is possible to quickly shift to the standby state, which is highly convenient for the user. In addition, when entering the service area of the ROHM network and waiting for only the radio wave of the ROHM network (see Z _{2 in} FIG. 5) during the out-of-range standby, the control channel that the ROHM network should wait for is captured in step S7. Communication using the roaming function is possible.

Transition from out-of-service standby to normal standby
(Immediately wait on the roam network) Immediately when the reception status immediately recovers after leaving the service while waiting on the roam network immediately before, the capture operation of the roam network is performed earlier than the home network, so immediately The control channel of the ROHM network is captured in the process of step S13 of FIG. If the stand-by activation condition is satisfied, the state shifts to the stand-by state in the ROHM network (steps S14, S9, S1).
0. See arrow E _{B in} FIG. 2 (2). As described above, by preferentially performing the capturing operation on the ROHM network, it is possible to quickly shift to the standby state, which is highly convenient for the user. In addition,
When entering the service area of the home network during the out-of-range standby and coming to a place where only the radio waves of the home network reach (see Z _{1 in} FIG. 5), the control channel to be listened to in the home network is captured in step S15. If the stand-by activation condition is satisfied, the system shifts to the stand-by state in the home network (step S).
16, S5, S6). This enables communication on the home network.

According to this embodiment, when the mobile station is in the standby state, whether the home network or the roam network is waiting in the mobile station is registered, and when the mobile station is out of range, the mobile station is registered. While intermittently turning on the power supply of the receiving system circuit of the wireless unit 6, the acquisition operation of the control channel to be awaited in the home network and the acquisition operation of the control channel to be awaited in the roam network are executed intermittently and alternately. At this time, the control channel acquisition operation that should be awaited in the mobile communication network that was awaiting immediately before going out of service is
Since the priority is given to the control channel acquisition operation that should be waited for on the opposite network, the user can switch between the home operator mobile communication network and the roam operator mobile communication network when out of service due to radio interference. Among them, it is considered to be on the side that was waiting immediately before, but since the control channel acquisition operation of the mobile communication network on the side that was waiting immediately before this is prioritized and executed first, the radio interference is recovered in a short time. If you do
The transition time from the out-of-range state to the standby state can be completed in a short time, and no matter whether the user is in the home carrier mobile communication network or the roam carrier mobile communication network, there is a long wait until the user can make a call. It will not be done. Also,
Even when the user moves to the mobile communication network of the business operator on the opposite side to the one that the user has been waiting for immediately before, the control channel of the mobile communication network of the business operator can be surely acquired.

Next, a second embodiment of the mobile station according to the present invention will be described with reference to FIGS. FIG. 6 shows the controller 8
7 is a flowchart showing a process when the power is turned on, FIG. 7 is a flowchart of an out-of-range waiting process by the controller 8, and FIG. 8 is an explanatory diagram showing a time schedule during the out-of-range waiting. In the first embodiment of FIGS. 1 to 5, when intermittently receiving in an out-of-range state, a control channel acquisition operation is performed by alternately switching between the mobile communication network on the side that was waiting immediately before and the opposite mobile communication network. However, in the second embodiment,
When registering the network that was waiting just before the out-of-range state, when switching the mobile communication network on the side that was waiting immediately before and the opposite mobile communication network to capture the control channel, first, The mobile communication network on the side that has been waiting immediately before is performed first, and the side of the network that has been waiting immediately before is interlocked with the intermittent reception, and performs the operation of capturing the control channel that should be waited for each time, and the network on the opposite side. Waits once every n times. Even if the radio interference continues, the transition time to the standby state can be always shortened by giving priority to the mobile communication network that was standing by immediately before going into the out-of-range state and performing the capture operation with high frequency. To do so.

Next, the operation of the second embodiment will be described. Here again, the service areas of the home network and the ROHM network are separated. Also, T _Y = 2 seconds and n = 4. Further, the status flag AF is set to 0 when the acquisition operation of the control channel to be awaited is performed only for the home network (fixed mode), and is set to 1 when performed for both the home network and the roam network (variable mode). ). When the power is turned on In FIG. 6, when the power key is pressed, the controller 8 supplies power to each part of the wireless unit 6 except the transmission system circuit,
AF is a variable mode of 1 and LN is a home network (S21-
In step S23, the control channel to wait in the home network is captured, and if all the standby activation conditions of (1) to (4) are satisfied, the LN is set as the home network again, and then the standby state is entered (step S24). ~ S27). If the answer is NO in step S25, then the control channel to wait for in the ROHM network is captured, and (1)-
If all the standby activation conditions of (3) and (4) 'are satisfied, the LN is set to the roam network and then the standby state is entered (steps S28 to S32).

Out-of-service standby (see FIGS. 5 and 8) While waiting in the home network (LN = home network, AF = 1,
(Refer to Z _{1 in} FIG. 5), when the reception condition of the radio wave deteriorates, the reception level from the base station in the zone within the zone falls below the standby deterioration level, and the reception level from the base station in the peripheral zone also falls below the standby permission level, Proceed to the out-of-service standby processing of FIG. First, since AF = 1, the fixed mode of 0 is set, and after clearing C to 0, the power supply of the reception system circuit of the wireless unit 6 is turned off only for T _Y = 2 seconds (the transmission system circuit remains off). Then, the TDMA circuit 7 is set to the standby mode (steps S33 to S36). Then, initially, the count value C of the counter is smaller than (n-1), so step S3
Proceed to step 8 to check the LN status. Since the LN is the home network here, the process returns to step S24 in FIG. 6 to supply power to the respective units of the wireless unit 6 except the transmission system circuit, and perform the capture operation of the control channel to be awaited in the home network. If not captured, steps S25 and S2
After 8 and S33, C is incremented by 1 (step S39).
Thereafter, in the same manner, the control channel acquisition operation of the home network is intermittently repeated by intermittent reception until the control channel to be awaited in the home network can be acquired or C becomes (n-1). When C = (n-1), step S
Since the answer of step 37 is NO, the AF mode is changed to the variable mode of 1 and the process proceeds to step S24 (step S40).
Following the control channel acquisition operation of the home network, the control channel acquisition operation of the roam network is performed. If none of them can be captured, AF is reset to 0 and C is cleared (steps S25, S28 to S30, S33 to S35), and again,
While intermittently receiving (n-1) times, the control channel acquisition operation is performed only for the home network (see FIG. 8 (1)). In this way, when the home network immediately before goes out of service while waiting for the home network, the home network preferentially performs the control channel acquisition operation first and the acquisition operation at a higher frequency than ROHM.

On the contrary, when the reception state of the radio wave is deteriorated while waiting in the roaming network (LN = roaming network, AF = 1, see Z ₂ in FIG. 5) and the out-of-range standby processing is performed, the operation is intermittent. While receiving (n-1) times, the control channel acquisition operation is performed only for the ROHM network (step S in FIG. 7).
33 to S38, steps S29, S30 and S3 in FIG.
3, S39, S36 to S38) and C = (n-1), the answer is NO in step S37, so the AF is changed to the variable mode of 1 and the process proceeds to step S24 in FIG. The control channel of the home network and the control channel of the roam network are captured. If none of them can be captured, AF is reset to 0 and C is cleared (steps S25, S28 to S30, S33 to S35), and again, while receiving intermittently (n-1) times, control is performed only on the ROHM network. Performs channel capture operation. In this way, when the roaming network waits for the roaming network immediately before and becomes out of service, the roaming network preferentially captures the control channel first, and also captures the operation more frequently than the home.

Transition from out-of-service standby to normal standby
(Standby in the home network immediately before) When the reception state is immediately recovered after the mobile station is out of service in the state in which it was waiting in the home network immediately before, the operation of capturing the home network as compared to the roam network is similar to the first embodiment. Since this is done first, the control channel of the home network is immediately acquired by the processing of step S24 in FIG. When all the standby conditions are satisfied, the home network shifts to a standby state (steps S25 to S27; see arrow F _{A in} FIG. 8 (1)). Also,
Even if the reception state does not recover immediately, the frequency of capturing operation of the home network is higher than that of the roam network, so that there is a high probability that the control channel to be awaited in the home network in step S24 is captured. Therefore, if the control channel of the home network is immediately acquired and all the standby conditions are satisfied, the home network shifts to the standby state. In addition, when entering the service area of the ROHM network and waiting for only the radio wave of the ROHM network while waiting for the outside of the service area (see Z _{2 in} FIG. 5), step S2 in FIG. 6 is performed.
At 9, the control channel to be awaited in the roaming network is captured, so that communication utilizing the roaming function is possible.

Transition from out-of-service standby to normal standby
(Immediately wait in the roam network) When the reception state is immediately recovered after leaving the service while waiting in the roam network immediately before, the capture operation of the roam network is performed as compared with the home network as in the first embodiment. Since this is done first, the control channel of the ROHM network is immediately acquired in the process of step S29 in FIG. If the standby condition is satisfied all shifts to the standby state of the home network (see arrow F _B at step S30 to S32. FIG. 8 (2)). Also,
Even if the reception state does not recover immediately, the roaming network captures more frequently than the home network, so that the control channel to wait in the roaming network in step S29 is likely to be captured. Therefore, if the control channel of the roam network is immediately acquired and all the standby conditions are satisfied, the standby state of the roam network is entered. In addition, when entering the service area of the home network while waiting for the outside of the service area and reaching the place where only the radio wave of the home network reaches (see Z _{1 in} FIG. 5), step S2 in FIG.
At 4, the control channel to be awaited in the home network is captured, so that communication becomes possible.

According to the second embodiment, when the mobile station is out of the service area, the operation of capturing the control channel to wait for in the home carrier mobile communication network and the capture of the control channel to wait in the roam carrier mobile communication network are performed. The operation is switched and executed. At this time, of the home carrier mobile communication network and the roam carrier mobile communication network, the acquisition operation of the control channel that should be awaited by the mobile communication network on the side waiting immediately before is frequently and preferentially performed. Then run. As a result, the control channel of the mobile communication network on the side that was waiting immediately before is prioritized and executed first.Therefore, when the radio interference is recovered in a short time, the transition time from the out-of-range state to the standby state can be set. It can be done in a short time, and there is no long waiting time until the user can make a call regardless of whether the user is in the home carrier mobile communication network or the roam carrier mobile communication network. Also, even if the radio interference continues to some extent, the control channel of the mobile communication network on the side that has been waiting immediately before is frequently captured, so when the radio interference is recovered,
There is a high probability that the control channel of the mobile communication network on the waiting side immediately before will be acquired, and the transition to the standby state can be performed quickly. Further, even when the user moves to the mobile communication network of the business operator on the opposite side to the one that the user had been waiting for immediately before, the control channel of the business operator mobile communication network can be reliably captured.

In each of the above-mentioned embodiments, a mobile phone has been described as an example, but the present invention can be similarly applied to other types of mobile communication such as PHS, PDA, MCA and pager. Further, although T _{Y is set} to 2 seconds, it may be set to another time such as 1.5 seconds and 3 seconds, or T _Y may be changed during the out-of-range waiting. Furthermore, n is 3,
Other settings such as 5, 6 may be used. Further, the reception may be suspended by turning off only a part of the power source such as the receiving circuit 6B in the receiving system circuit. In addition, the first rest period after being out of the service area may be omitted.

[0028]

According to the out-of-service standby method for mobile communication of the present invention, when the mobile station is in the standby state, which of the home operator mobile communication network and the roam operator mobile communication network is waiting in the mobile station is registered. After that, when the mobile station goes out of service, the control channel acquisition operation for the home carrier mobile communication network and the control channel acquisition operation for the ROHM carrier mobile communication network are switched and executed. , In this case, the home carrier mobile communication network and the ROHM mobile communication network preferentially execute the control channel acquisition operation that should be awaited by the mobile communication network on the side that has been waiting immediately before, so that the radio wave interference, etc. When it is out of range, it is considered that the user is on the side of the home operator mobile communication network and the roam operator mobile communication network that was waiting immediately before. Since the control channel capture operation of the mobile communication network on the waiting side immediately before this is prioritized and executed first, the transition time from the out-of-range state to the stand-by state is set when the radio interference is recovered in a short time. It can be done in a short time, and there is no long waiting time until the user can make a call regardless of whether the user is in the home carrier mobile communication network or the roam carrier mobile communication network. Further, even when the user moves to the mobile communication network of the business operator on the opposite side to the one that was waiting immediately before, the control channel of the mobile communication network of the business operator can be surely acquired.

According to another out-of-service standby method for mobile communication of the present invention, when the mobile station is in a standby state, which of the home operator mobile communication network and the roam operator mobile communication network is waiting in the mobile station is registered. After that, when the mobile station goes out of service, the control channel acquisition operation for the home carrier mobile communication network and the control channel acquisition operation for the ROHM carrier mobile communication network are switched and executed. , At this time, by performing the control channel capturing operation that should be awaited in the mobile communication network of the side that has been waiting immediately before among the home carrier mobile communication network and the roam carrier mobile communication network with high frequency and priority, , The control channel of the mobile communication network on the side that has been waiting immediately before is prioritized and executed first. Can be dispensed in a short time transition time to the standby state from the state, even in any user's home service provider mobile communications network and the Rohm company mobile communication network,
You won't have to wait long before you can make a phone call. In addition, even if the radio interference continues to some extent, the control channel of the mobile communication network on the side that has been waiting immediately before is frequently captured, so after the radio interference is recovered, the device waits immediately before the standby. There is a high probability that the control channel of the mobile communication network on the receiving side will be captured, and the transition to the standby state can be performed quickly. Further, even when the user moves to the mobile communication network of the business operator on the opposite side to the one that was waiting immediately before, the control channel of the mobile communication network of the business operator can be surely acquired.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a mobile station embodying an out-of-range waiting method for mobile communication according to the present invention.

FIG. 2 is an explanatory diagram showing a time schedule during standby outside the service area.

FIG. 3 is a flowchart showing the operation of the controller.

FIG. 4 is a flowchart showing the operation of the controller.

FIG. 5 is an explanatory diagram of an out-of-service standby operation.

FIG. 6 is a flowchart showing the operation of the controller of the second embodiment of the mobile station which embodies the out-of-service waiting method for mobile communication according to the present invention.

FIG. 7 is a flowchart showing the operation of the controller of the second embodiment.

FIG. 8 is an explanatory diagram showing a time schedule during standby outside the service area in the second embodiment.

FIG. 9 is an explanatory diagram of a conventional out-of-service waiting operation.

[Explanation of symbols]

1 Operation / Display Unit 5 Antenna 6 Radio Unit 6B Reception Circuit 6C Demodulator 7 TDMA Circuit 8 Controller Z ₁ , Z ₂ Mobile Station

Claims (2)

[Claims] 1. A mobile station waits in a mobile communication in which the mobile station uses both a home carrier mobile communication network to which the mobile station subscribes and a roam carrier mobile communication network permitted to roam. When the mobile station is in the state, it is registered whether it is waiting in the home operator mobile communication network or the roam operator mobile communication network in the mobile station, and then when the mobile station goes out of range, the home operator mobile communication network The switching operation between the control channel acquisition operation to be waited for and the control channel acquisition operation to be waited for in the roam carrier mobile communication network is executed by switching between the home carrier mobile communication network and the roam carrier mobile communication network immediately before. Priority is given to the control channel acquisition operation that should be waited for in the mobile communication network on the standby side, and when the control channel is acquired, the standby mode is set. It was to shift the state, out of service waiting method for a mobile communication according to claim. 2. The mobile station waits in mobile communication in which the mobile station uses both a home carrier mobile communication network to which the mobile station subscribes and a roam carrier mobile communication network permitted to roam. When the mobile station is in the state, it is registered whether it is waiting in the home operator mobile communication network or the roam operator mobile communication network in the mobile station, and then when the mobile station goes out of range, the home operator mobile communication network The switching operation between the control channel acquisition operation to be waited for and the control channel acquisition operation to be waited for in the roam carrier mobile communication network is executed by switching between the home carrier mobile communication network and the roam carrier mobile communication network immediately before. The control channel could be captured by executing the capture operation of the control channel that should be awaited in the waiting mobile communication network with high frequency and priority. , Waiting that so as to transition to a state, out-of-service standby method for mobile communication according to claim.