JP2000175259A - Standby control system for mobile telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power of a battery and to extend a wait time by gradually changing a scanning operation interval in a perch channel search at the outside of a zone. SOLUTION: In the case that a portable telephone set is resident at the outside of a zone of a base station, a perch channel is scanned in a 1st mode where a scanning operation interval is selected to be 4 sec. The scanning in the 1st mode continues for 10 min. In the case that the standby operation cannot be obtained even after the end of the 1st mode period, the 2nd mode is selected. In this case, the scanning interval is selected to be 6 sec. The perch channel scanning in the 2nd mode is set to 60 min. Even when the standby operation cannot be obtained, the 3rd mode is selected. The scanning in the 3rd mode period is set to 10 sec. The perch channel scanning period in this 3rd mode is not set and the scanning continues until a battery is worn out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a standby control system for a mobile telephone, and more particularly to a standby control system for reducing power consumption in a digital mobile telephone capable of standby on a home network and a roaming network.

[0002]

2. Description of the Related Art A control system for a mobile telephone in a digital telephone system is defined by a digital mobile telephone system standard (STD-27C) produced by the Radio System Development Center (RCR). In this STD-27C, when the mobile telephone is in the service area of the roaming destination network, the mobile telephone that has been powered on first scans a perch channel of the home network and creates a perch channel table.

[0003] Next, the mobile telephone activates (synchronizes) sequentially from the perch channel at the head of the perch channel table (normally arranged in the order of strong radio waves), and receives broadcast information. This broadcast information includes network number information. The mobile telephone determines from the broadcast information including the network number information whether the channel is a standby channel. If it is determined that standby is possible, the operation shifts to standby operation on the perch channel. If it is determined that it is not possible to wait, the next perch channel is activated.

[0004]

As described above, in the conventional mobile telephone standby control system, when the mobile telephone goes out of the control area of a certain base station, a plurality of perch channels are scanned at a predetermined period, and the Is selected as a standby channel to perform a standby operation.
If the mobile phone enters an area where radio waves are temporarily blocked such as a tunnel or an elevator, it is supported as a base station area, but if it enters a weak electric field area, Includes unsupported regions. In addition, when it is considered that the perch channel is completely out of range, a perch channel table cannot be created in many cases even if the perch channel is scanned at the same cycle.
In many cases, one of the optimal channels cannot be selected as a standby channel even after scanning.

That is, there is a low possibility that the operation can shift to the standby operation. Therefore, when the mobile phone moves out of the service area, useless scanning of the perch channel consumes power of the mobile phone, and there is a disadvantage that the standby time of the mobile phone in the out of service area is shortened. Therefore, an object of the present invention is to improve the standby time of a mobile phone by changing the scanning operation interval of the perch channel to reduce power consumption when the mobile phone moves out of the control range of the base station providing the perch channel. It is an object of the present invention to provide a standby control method for a mobile telephone to be controlled.

[0006]

According to the present invention, in order to achieve the above object, in a standby control system of a digital mobile telephone, a scanning operation interval in a perch channel search outside a service area is gradually changed.

Further, the present invention relates to a standby control system for a digital mobile telephone, which scans a plurality of perch channels in a first mode period, selects one of the optimum channels as a standby channel, and performs a standby operation. 1
A second mode cycle having a longer scan operation interval than the mode cycle and a third mode cycle having a longer scan operation interval than the second mode cycle are provided, and the mobile telephone is out of the control range of the base station providing the perch channel. When moving, the perch scan operation is performed sequentially in the first mode cycle, the second mode cycle, and the third mode cycle until the operation shifts to the standby operation.

Further, the present invention relates to a standby control system for a digital mobile telephone, wherein a scan is continued in a first mode cycle and a scan is continued in a second mode cycle, and the scan is continued more than the first mode period. When the mobile telephone moves out of the control area of the base station providing the perch channel by providing a long second mode period and a third mode period in which scanning is continued in the third mode period and is longer than the second mode period. Performs the scan operation by changing the perch scan operation interval in the first mode period, the second mode period, and the third mode period sequentially until the operation shifts to the standby operation.

The scan operation interval in the first mode cycle is 4 seconds, the scan operation interval in the second mode cycle is 6 seconds,
The scan operation interval in the mode cycle is preferably set to 10 seconds. Further, it is preferable that the first mode period is 10 minutes, the second mode period is 60 minutes, and the third mode period is from the end of the second mode period until the battery is consumed. Also,
The scan in the third mode period can be executed such that the scan in the ROHM network is omitted each time when the home network has shifted to the standby operation by the previous scan. Further, in the scan in the third mode period, if the network which has shifted to the standby operation by the previous scan is the home network and the channel is activated in the ROHM network by the current scan, the next scan in the ROHM network is performed. Do not omit it.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a mobile telephone standby control system according to the present invention; FIG. 1 is a diagram showing a pattern when the scanning operation interval is changed outside the service area in the standby control system of the present invention. In the present invention, three operation modes having different scan operation intervals are prepared. The first mode (when the user has just left the service area and may soon return to the service area) sets the scan operation interval between the current scan operation and the next scan operation to 4 seconds, and the second mode ( The scan operation interval is set to 6 seconds when it is considered that the user is substantially out of the service area, and the scan operation interval is set to 10 seconds in the third mode (when the user can be considered to be completely out of the service area). The continuation time of these scan operation modes is set to 10 minutes in the first mode and to 60 minutes in the second mode. In the third mode, there is no particular time setting. After the transition from the second mode to the third mode, the operation is continued until the battery is consumed.

FIG. 2 is a timing chart schematically showing these three modes. FIG. 2A shows the first mode, FIG. 2B shows the second mode, and FIG. 2C shows the third mode. When the mobile telephone goes out of the range of a certain base station, scanning of the perch channel is performed in the first mode in which the scanning operation interval is 4 seconds. When such a mobile telephone goes out of the service area, the scanning operation in the first mode is initially continued for 10 minutes. A period during which the perch scan operation is performed in the first mode is referred to as a first mode period. Similarly, a period during which the perch scan operation is performed in the second mode is referred to as a second mode period, and a period during which the perch scan operation is performed in the third mode is referred to as a third mode period. In the first mode period, it is assumed that the mobile telephone enters a state where radio waves are temporarily interrupted such as a tunnel or an elevator. Therefore, it is assumed that the user escapes from such a situation in a short time and returns to the normal area. Therefore,
During this mode period, the perch scan operation is performed at relatively short intervals.

If the standby mode cannot be shifted to the standby mode even after the end of the first mode period, the mode shifts to the second mode.
In this case, the scanning operation interval is 6 seconds. In the second mode period, it is assumed that the mobile station has moved from a control range of a certain base station to a region of a weak electric field which can be considered to be almost out of range. Therefore, in this mode period, the interval is slightly wider than the scan operation interval in the first mode.

The perch scanning operation in the second mode period is set to 60 minutes. If the mobile station can shift to the standby operation within the second mode period, the mobile station shifts to the normal standby mode. However, if the standby operation cannot be performed within the second mode period, the process shifts to the third mode period. The scan operation interval in the third mode period is set to 10 seconds. The perch scan operation period in the third mode is not set, and is performed after the transition from the second mode period until the battery is consumed. This third mode period is assumed to be an area that is not supported at all as a control area of the base station, that is, an area where radio waves do not reach (out of complete coverage).

FIG. 3 is a flowchart showing the operation of changing the perch channel scanning operation interval during out-of-service operation according to the present invention. When the mobile phone goes out of the service area, the operation of changing the scanning operation interval starts (step 101). When the mobile phone recognizes that the perch channel cannot be captured or the standby channel cannot be selected, the mobile phone enters
The scan operation cycle is set to be the first mode. Next, the operation mode timer (corresponding to each operation mode period) is set to 10 minutes and the timer is started (step 102).

Next, the operation mode is determined (step 103). In the case of the first mode, the scan timer is set to four.
Seconds are set and started (step 104). If the operation mode is the second mode, the scan timer is set to 6 seconds and started (step 105). When the operation mode is the third mode, the scan timer is set to 1
It is set to 0 seconds and started (step 106).

When the scan operation in each of the operation modes reaches the set time of the set scan timer (step 107), the scan operation of the perch channel is executed at the scan operation interval in the operation mode during this period (step 107). Step 108), it is determined whether or not a perch channel exists (Step 10).
9). If there is a perch channel, one of them is selected as a standby channel and it is determined whether or not the mobile station can be on standby (step 110). If it is determined that the standby operation is possible, the setting is made in step 102. The operation mode timer that has been set is stopped (step 11).
1), the process proceeds to a standby operation (step 112).

If there is no perch channel in step 109, or if the standby operation cannot be performed as a result of activation of the standby channel in step 110, it is determined in step 113 whether the operation mode timer has completed the timer operation. Is performed, and if not completed, the process returns to step 103 again. Step 1
If the set time of the operation mode timer has been completed in step 13, the current operation mode is confirmed in step 114.

If the current operation mode is the first mode, the operation mode is reset to the second mode, the set time of the operation mode timer is set to 60 minutes, the timer is started, and the process returns to step 103. . If the current operation mode is the second mode, the process returns to step 103 after setting the third mode. In the above description, the scan operation interval and the mode period are set to specific values. However, the present invention is not limited to this, and it goes without saying that the scan operation interval and the mode period can be changed as needed.

The present invention can also be applied to standby control in a carrier of a partner when different carriers (operators) provide services in the same frequency band, and in this case, standby in another carrier's network. By improving the scanning operation in the third mode period described above for control, the power consumption of the battery can be further suppressed and the standby time can be extended.

Next, a description will be given of an operation of omitting such a perch channel scanning operation. All of these operations are performed in the third mode period. FIG. 4 is a timing chart for explaining a method of omitting a scan operation in a network (a roam network) of another carrier under a predetermined condition.

The operation shown in FIG. 4A is based on the notification from the base station when the mobile station goes out of the range of a base station and activates the perch channel at last, and the mobile station shifts to standby. The fact that the network to which the standby transition has been made from the information is the home network is stored in the memory in the mobile device, and the operation in that case is explained. The scanning of the perch channel is performed first for the home network and then for the ROHM network. At this time, both the home network and the roam network scan the perch channel, receive no radio waves at all, perform the last perch scan, and store in the memory that the network switched to standby was the home network. If so, the scanning in the ROHM network is omitted in the next scanning. This is because the previous standby network was the home network, and the next standby network is likely to be the home network. After scanning only the home network in this way, when a predetermined scanning operation interval elapses, the home network and the ROHM network are scanned again.

That is, when the past standby network is the home network, there is a high possibility of standby on the home network.
The scanning operation in the ROHM network is omitted each time. On the other hand, in FIG. 4B, when the mobile station goes out of the range of a certain base station, the fact that the last standby network was the roaming network is stored in the memory in the mobile station, and the operation in that case is shown. I have. In this case, there is a high possibility that the standby operation returns to the ROHM network due to the scanning operation, so that the scanning operation of the ROHM network is not omitted and the scanning of both the home network and the ROHM network is continued in the third mode. The scanning operation described above is a case where the mobile phone is out of the complete service area and the radio wave from the base station cannot be received even by the scanning operation.

On the other hand, the timing charts shown in FIGS. 5A and 5B respectively correspond to FIGS. 4A and 4B. In FIG. 5A, when the presence of a radio wave in the roaming network is detected in the perch scan outside the area, the roaming is performed in the next scan. Since there is a high possibility that the perch channel is captured in the network, the scan in the ROHM network is not omitted in the next scan. As a result, if no radio wave is detected, the scan in the ROHM network is executed while omitting each time from the next time as shown in FIG. FIG.
In the case shown in FIG. 4B, the possibility of returning to the ROHM network is high as in FIG. 4B, so that the ROHM network scan is not omitted, and the ROHM network perch scan is performed every time together with the home network perch scan. Execute.

FIGS. 6 and 7 are flowcharts for explaining the scanning operation in FIGS. 4 and 5. When the mobile phone moves out of the service area and the scan determination process starts in the third mode period (step 201), first, a perch channel in the home network band is scanned (step 202). It is determined whether or not a perch channel exists in the home network band (step 2).
03) If there is a perch channel, it is activated to obtain notification information and make a standby determination (step 204). If it is determined that the standby is possible, the process proceeds to a standby operation (step 205). On the other hand, if there is no perch channel in step 203 or if it is determined in step 204 that standby is not possible, it is determined whether or not the last standby network that performed standby was the home network. (Step 206). FIG. 7 shows a case where the previous (immediate) standby network is the home network and scanning is performed in the third mode.
Then, the processing shifts to a flowchart as described later. If the other conditions (the last standby network is the ROHM network) are satisfied, the process proceeds to step 207, where it is stored that the ROHM network has been scanned, and the perch channel of the ROHM network band is scanned.

Next, it is determined whether or not a perch channel exists (step 208). If a perch channel exists, channel activation is performed (step 20).
9) If the result of the stand-by determination is that the stand-by is possible, the stand-by operation starts (steps 210 and 211). If there is no perch channel in step 208, the channel is not activated (step 21).
2) It is determined to be out of service area (step 213).

If it is determined in step 206 that the previous (previous) standby network is the home network, the process proceeds to step 214 shown in FIG. 7, where it is determined whether or not the ROHM network has been scanned. Is executed, it is determined whether or not channel activation has been executed (step 215). If the perch scan of the ROHM network is not executed in step 214 or the channel is activated in step 215, the process returns to step 207 shown in FIG. If the channel has not been activated in step 215, it is determined that no ROHM network scan has been performed in the next scan, and this is stored and the ROHM network scan is omitted (step 216). Next, it is determined that the area is out of service area (step 217). By omitting scanning of the ROHM network under predetermined conditions in such a perch scanning operation outside the service area, the standby time can be drastically increased.

[0027]

As described above, according to the present invention, the power consumption of the battery can be reduced by changing the scan operation interval of the perch scan operation when out of service area.
The standby time can be greatly extended. Approximately 30% compared to the perch scan operation in the normal fixed cycle (fixed perch scan operation interval) outside the service area
The standby time can be improved. Further, if the scanning of the ROHM network is omitted under the predetermined condition in the third mode period, the consumption of the battery can be further suppressed, and the extension of the standby time by 60% or more can be achieved as compared with the related art. As described above, according to the present invention, it is possible to expect an excellent effect that the standby time of the mobile telephone can be greatly extended while the power consumption of the battery is reduced.

[Brief description of the drawings]

FIG. 1 is a timing chart for explaining a standby control operation of the present invention.

FIG. 2 is a timing chart of various modes used for standby control of the present invention.

FIG. 3 is a flowchart illustrating a procedure for changing a scan interval of a perch channel outside the service area.

FIG. 4 is a timing chart illustrating an operation of omitting a ROHM network when out of service area.

FIG. 5 is a timing chart showing the omission of the ROHM network when out of service area.

FIG. 6 is a flowchart (part 1) illustrating an operation of omitting the scanning operation of the ROHM network when out of service area.

FIG. 7 is a flowchart showing an operation of omitting a scan operation of the ROHM network when out of service area (part 2).

Claims (7)

[Claims] 1. A standby control method for a digital mobile telephone, wherein a scan operation interval in a perch channel search in an out-of-service area is gradually changed. 2. A standby control system for a digital mobile telephone, wherein a plurality of perch channels are scanned in a first mode cycle, and one of the most suitable channels is selected as a standby channel to perform a standby operation. 2nd scan operation interval longer than cycle
And a third period having a longer scanning operation interval than the second mode period.
A mode cycle, wherein when the mobile phone moves out of the control range of the base station providing the perch channel, the first mode cycle, the second mode cycle, and the third mode are sequentially performed until the mobile phone shifts to the standby operation. A standby control method for a digital mobile telephone, wherein a perch scan operation is performed in a mode cycle. 3. A standby control method for a digital mobile phone, comprising: a first mode period in which scanning is continued in the first mode period; and a scanning period in which scanning is continued in the second mode period. A long second mode period, and a third mode period in which scanning is continued in the third mode period and is longer than the second mode period, wherein the mobile phone is out of the control range of a base station that provides the perch channel. Wherein the mobile station performs a scan operation by changing a perch scan operation interval in the first mode period, the second mode period, and the third mode period sequentially until the standby operation is started. Standby control method. 4. The standby control method for a digital mobile phone according to claim 2, wherein a scan operation interval in the first mode cycle is 4 seconds, a scan operation interval in the second mode cycle is 6 seconds, A standby control method for a digital mobile telephone, wherein a scan operation interval in a third mode cycle is set to 10 seconds. 5. The digital mobile phone standby control method according to claim 2, wherein the first mode period is 10 minutes, the second mode period is 60 minutes, and the third mode period is a second mode period. A standby control method for a digital mobile telephone, wherein the operation is completed until the battery is consumed. 6. The digital mobile phone standby control method according to claim 1, wherein in the scan in the third mode period, a network which has shifted to a standby operation by a previous scan is a home network. A standby control method for a digital mobile telephone, wherein the scanning in the ROHM network is executed once each time. 7. The digital mobile phone standby control method according to claim 6, wherein in the scan in the third mode period, the network which has shifted to the standby operation by the previous scan is the home network, and the current scan is performed. A standby control method for a digital mobile telephone, characterized in that if a channel is activated on the ROHM network, the next scanning on the ROHM network is not skipped.