JP3341282B2 - W-CDMA terminal power saving system and method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a W-CDMA (Wide
band-Code Division Mutipl
e Access) terminal. In particular, the present invention relates to a power saving system and method for a W-CDMA terminal for saving power consumption of a battery.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 11-275644, a PHS (Personal
Handy Phone System), PDC (P
(Personal Digital Cellular)
It is known that such a mobile terminal receives only radio waves of one base station at the time of standby.

At present, a CDMA system is being developed as a next-generation mobile phone for commercialization in the future. In particular, WC
In a DMA terminal (3rd generation), radio waves of a plurality of base stations can always be received at the same time (reception of a plurality of branches), thereby making it difficult to disconnect a call during a call.

On the other hand, in a W-CDMA terminal, power is turned on,
The terminal shifts to a standby operation in which the terminal waits for an outgoing / incoming call due to a call termination or the like. In the standby mode, the terminal always receives signals from a plurality of base stations (receives a plurality of branches) and performs a standby operation.

[0005]

However, the above W
-A CDMA terminal differs from a conventional mobile terminal in that the CDMA terminal performs standby reception by receiving a plurality of branches. The CDMA terminal consumes a larger amount of battery power during standby than a conventional mobile terminal, and the traffic for location registration increases. Is increased.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a power saving system and method for a W-CDMA terminal that can save battery power consumption as much as possible during standby and at the same time reduce location registration traffic. I do.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a power saving system for a W-CDMA terminal in which radio waves are transmitted from a plurality of base stations during standby. A power-saving mode setting unit for setting the number of receiving base stations to be received to only one, and saving power consumption of a battery during standby; and the plurality of reception base stations set by the power-saving mode setting unit during standby reception. And a perch detection unit for ending detection when a base station having the highest reception level is received by receiving a radio wave from the base station of the W-CDMA terminal.

By this means, it is possible to save the current consumption of the battery at the time of standby, and at the same time, it is possible to contribute to the reduction of the traffic for location registration. Preferably, when the perch detection unit cannot detect any of the base stations, a time until re-detection is set so as to save power consumption of a battery.

By this means, the re-detection of the base station when out of the service area is not frequently performed, so that the power consumption of the battery can be saved. Preferably, when one permissible base station is detected by the perch detection unit outside the service area, the detection of the perch detection unit is terminated. By this means,
Since detection of the remaining base stations is not performed, it is possible to save power consumption of the battery.

[0010] Preferably, only the paging channel from the one receiving base station set by the power saving mode setting unit is intermittently received. By this means, the previous area information and the current area information are collated. Preferably, a location registration signal is transmitted only to the one receiving base station set by the power saving mode setting unit.

According to this means, when the previous area information is different from the current area information, the location registration signal is transmitted to only one receiving base station, so that the location registration traffic can be reduced. Further, the present invention provides a power saving method for a W-CDMA terminal in which radio waves are transmitted from a plurality of base stations during standby, wherein only one receiving base station to be received from among the plurality of base stations is set, When saving the current consumption of the battery, and as the receiving base station, when receiving radio waves from the plurality of base stations during standby reception and detecting the base station with the highest reception level,
And terminating the detection.
A power saving method of a DMA terminal is provided.

According to this means, the power consumption of the battery can be saved in the standby mode, and the traffic for location registration can be reduced at the same time as in the above invention.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a WC according to the present invention.
FIG. 2 is a block diagram illustrating a schematic configuration of a power saving system of a DMA terminal. As shown in the figure, a wireless unit 1 is provided in the power saving system of a W-CDMA terminal. The wireless unit 1 performs transmission and reception with a plurality of base stations via an antenna according to the W-CDMA system, It receives signals, sends outgoing signals, etc. Here, the W-CDMA system is a broadband spread spectrum / code division multiple access system, and the description of this system itself is omitted because it has little relation to the present invention.

A control unit 2 is connected to the radio unit 1, and the control unit 2 controls transmission and reception of the radio unit 1, manages a protocol of a radio signal, and performs a call, a standby reception, and the like. An operation unit 3 is connected to the control unit 2, a wireless state is notified from the control unit 2 to the operation unit 3, and a request to start or end a call is made to the operation unit 3 by a user operation. .

A display unit 4 is connected to the operation unit 3. The display unit 4 displays a status of a terminal such as an out-of-service area, an in-service area display, or the like to the user via the operation unit 3 through notification from the control unit 2. The operation displays a telephone number or the like during a call. Further, a speaker 5 is connected to the operation unit 3, and the other party's voice is reproduced from the speaker 5 during a call.

Further, a vibrator 6, L
ED (Light Emitting Diode) 7
Is connected, and the user is notified of the incoming call by the vibration of the vibrator 6 at the time of the incoming call, and the user is notified of the incoming call by lighting or blinking of the LED 7. The control unit 2 includes a storage unit 8
The storage unit 8 stores a telephone number, an area number, a terminal number, setting information for a request from the operation unit 3, and the like.

The control unit 2 includes a power saving mode setting unit 2
A is provided, and as described later, the power saving mode setting unit 2A performs power saving control of the battery at the time of standby, and notifies whether the operation at the time of standby is the normal mode or the power saving mode. Further, a perch detection unit 9 is provided in the wireless unit 1, and the perch detection unit 9 determines, based on a notification from the wireless unit 1, whether the operation at the time of standby is the power saving mode or the normal mode. In order to perform the standby operation, only one standby base station to which the W-CDMA terminal is to be connected is detected.

FIG. 2 is a flowchart for explaining an operation example of the power saving mode setting section 2A and the perch detecting section 9 of the control section 2 in FIG. In step S1, the power of the power saving system of the W-CDMA terminal is turned on. In step S2, the power saving mode setting unit 2A of the control unit 2 determines whether the power saving mode setting is requested from the operation unit 3.

The request for setting the power saving mode and the request for canceling the setting of the power saving mode are stored in the storage unit 8. Step S3
In, when the power saving mode setting is requested, the perch detecting unit 9 is notified that the setting request is the power saving mode setting. The perch detection unit 9 performs a standby operation in the power saving mode based on the notification.

In the perch detector 9, a detection level for detecting a reception level is set. The detection level is set step by step, and the highest detection level α is set as a threshold in the initial setting. In step S4, the perch detection unit 9 performs a search process for comparing the reception level from the wireless unit 1 with the detection level α.

In step S5, it is determined whether there is a perch base station whose reception level exceeds the detection level α in the search processing. In step S6, if it is possible to receive with the base station, which is a perch, at a reception level exceeding the detection level α in the search processing, the apparatus enters a standby state of the base station with the power saving mode.

At the time of standby, a paging channel (PCH) from base stations in a plurality of areas is intermittently transmitted in a plurality of branches to a power saving system of a W-CDMA terminal. However, the standby mode is provided by providing a power saving mode. Occasionally, intermittent reception is performed in only one branch, and power consumption during standby can be saved. During standby, the area information received last time is compared with the area information received this time, and if different, a location registration signal is transmitted from the W-CDMA terminal to the base station.

In step S7, if the reception level at the time of standby does not fall below a certain standby holding level (detection level α), the process returns to step S6. And returns to the operation for detecting the reception level in the power saving mode of the base station. In this way, the monitoring state is maintained until the reception level drops to a certain level which is the monitoring state.

In step S8, if the reception level cannot exceed the highest detection level α in step S5, the detection level is lowered by one step, the detection level β is set, and the perch is detected. In step S9, it is determined whether the detection level β is lower than the lowest detection level. When it is determined that the value does not fall below the value, the process returns to step S4.

In step S10, when the reception level is lower than the lowest detection level, the out-of-service timer is started. In this out-of-service timer time setting, the setting is adjusted longer than the out-of-service timer setting time in normal mode,
The power consumption of the battery is saved. Step S1
At 1, the mobile station waits for the out-of-service power saving mode. If the timer is out during standby in the out-of-service power saving mode, the process returns to step S3, and the reception level is detected.

In step S12, when the setting of the normal mode is requested instead of the request of the setting of the power saving mode in step S2, a search for a normal base station is performed and a branch that can be added (a plurality of valid base stations) is searched. If a station radio wave is received), additional processing is performed. Upon completion of the base station search, the process returns to step S2. As described above, even when searching for a base station when out of service area, by ending the search when a radio wave of one base station is found, it is possible to shorten the search time and save the power consumption of the battery required for the search. Become. That is, re-detection of the base station when out of service area is not performed frequently.

In the case where no radio wave of the base station is received during the search during standby, by extending the time until the search is performed again, the power consumption of the battery when out of the service area can be saved. Further, in a situation where location registration is frequently transmitted when moving at a location where a plurality of area information can be received, as described below, the number of waiting reception branches may be reduced. By
It becomes possible to reduce the traffic of location registration.

FIG. 3 is a diagram for explaining the traffic reduction for location registration. As shown in the figure, three areas A,
Receiving points A1 and B receiving radio waves of base stations B and C
Conventionally, the location registration number is transmitted to the base station when the base station having the highest reception level changes when the area information is different when back and forth between C1 and C1 are performed.

On the other hand, when the power saving mode of the present invention is set, unnecessary location registration traffic can be reduced without performing location registration again until the first received radio wave cannot be obtained. Become.

[0030]

As described above, according to the present invention,
By power saving mode to reduce the number of waiting reception branches,
By limiting the functions to the minimum required, it is possible to save the current consumption of the battery during standby.

Further, the search process is terminated when the radio wave of one base station is captured in the search when the mobile station is out of the service area, so that the search time can be reduced and the power consumption of the battery during the search can be saved. Further, it is possible to reduce unnecessary location registration traffic without performing location registration again until the first received radio wave can no longer be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a power saving system of a W-CDMA terminal according to the present invention.

FIG. 2 is a flowchart illustrating an operation example of a power saving mode setting unit 2A and a perch detection unit 9 of the control unit 2 in FIG.

FIG. 3 is a diagram for explaining traffic reduction in location registration.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Radio | wireless part 2 ... Control part 2A ... Power saving mode setting part 3 ... Operation part 4 ... Display part 5 ... Speaker 6 ... Vibrator 7 ... LED8 ... Storage part 9 ... Perch detection part A, B, C ... Area A1, B1, C1 ... Reception points

Claims (6)

(57) [Claims] In a power saving system of a W-CDMA terminal in which radio waves are transmitted from a plurality of base stations during standby, only one receiving base station to receive from among the plurality of base stations is set. A power saving mode setting unit that saves the current consumption of the battery, and a base station that receives radio waves from the plurality of base stations during standby reception and has the highest reception level as the receiving base station set by the power saving mode setting unit. When a station is detected,
A power saving system for a W-CDMA terminal, comprising: a perch detection unit that terminates detection. 2. When the perch detection unit cannot detect any of the base stations, a time until re-detection is set so as to save power consumption of a battery. W- according to claim 1,
A power saving system for a CDMA terminal. 3. The out of service area, the perch detector detects 1
The power saving system for a W-CDMA terminal according to claim 1, wherein the detection of the perch detection unit is terminated when one receiving base station is detected. 4. The power saving of a W-CDMA terminal according to claim 1, wherein only a paging channel from said one receiving base station set by said power saving mode setting unit is intermittently received. system. 5. The power saving system for a W-CDMA terminal according to claim 1, wherein a location registration signal is transmitted to only the one receiving base station set by the power saving mode setting unit. 6. A power saving method for a W-CDMA terminal in which radio waves are transmitted from a plurality of base stations during standby, wherein only one receiving base station to be received is set from among the plurality of base stations. Saving power consumption of the battery, and, as the receiving base station, receiving radio waves from the plurality of base stations during standby reception and detecting the base station with the highest reception level, ending the detection. A power saving method for a W-CDMA terminal, comprising: