JPH09205677A - Digital cordless telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend an available standby time of the digital cordless telephone set by reducing the number of times of position registration at high speed movement so as to reduce a mean current consumption. SOLUTION: Even when the necessity of position registration is discriminated (YES in the S3), the position registration is not immediately made but the position registration is delayed while monitoring a synchronization consecutive time to the same base station (S6-S8) and only when the synchronization to the same base station is consecutive for a prescribed time (YES in the S8), the position registration is made (S9) and when the out of synchronism is caused with the same base station till a prescribed time elapses (YES in the S7), the position registration is not executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone, and more particularly to a digital cordless telephone having an automatic position registration function.

[0002]

2. Description of the Related Art A digital cordless telephone (mobile terminal) conforming to the first edition (RCR STD-28, Radio System Development Center) of the second generation cordless telephone system standard is a control carrier transmitted by a base station. LC
Receive a CH superframe (logical control channel),
The PCH (Paging), which is also a functional channel of the LCCH superframe, is obtained at the timing to be received by the own device, which is obtained by analyzing the BCCH (Broadcast Control Channel: broadcast information channel), which is a functional channel of the LCCH superframe. Channel: A call can be received by waiting for an incoming call while receiving the paging channel intermittently.

In this mobile communication system, which is also called a personal handyphone system, a digital cordless telephone moves within a communicable service area composed of a plurality of base stations for communication. Therefore, in order to connect the digital cordless telephone to the wireless communication network, it is necessary to register (position registration) location information indicating in which paging area the digital cordless telephone exists in the network location information database. is necessary.

The digital cordless telephone conforming to the above-mentioned second generation cordless telephone system standard has an automatic position registration function. Here, a conventional location registration control method will be described.

As described in Appendix Z "PS Operation with Automatic Location Registration Function" of the second-generation cordless telephone system standard, turning on the power of the digital cordless telephone or entering the area out of the service area. When a transition is made to a new standby state due to (zone transition between paging areas), at this time, synchronization is established by receiving an LCCH superframe that the base station periodically transmits intermittently, The location registration operation is to be performed when any of the above events occurs.

Location registration acceptance information (business operator identification code, paging area number) of the base station that has finally succeeded in location registration
I don't remember.

Location registration acceptance information of the base station that succeeded in location registration at the end (company identification code, paging area number)
And the currently synchronized base station carrier identification code and paging area number are different.

Regarding the timing of executing the location registration in the conventional digital cordless telephone, the location registration as described above is required at the time of shifting to standby by receiving the LCCH superframe and analyzing the BCCH (broadcast information channel). Whether or not it is determined, and the position registration control is performed immediately when it is necessary.

[0009]

However, if the location registration is executed at the timing as described above, a person carrying a digital cordless telephone may move while traveling at high speed using, for example, a vehicle or a train. Will repeat the zone transition between paging areas at short time intervals, and will frequently perform location registration. While moving at high speed (when moving at a speed that cannot maintain the line connection status), it is considered that there is almost no need for location registration as a practical problem. Registration is frequent and consumes unnecessary power. In particular, since location registration involves a transmission operation that consumes a large amount of power (such as transmission of a link channel establishment request message or location registration request message), average current consumption increases and standby time decreases during high-speed movement. There is.

Since the digital cordless telephone is used by moving it, the power supply capacity is severely limited, and it is desired to reduce power consumption.

The present invention has been made in view of the above, and an object thereof is to reduce the average current consumption and extend the standby time by reducing the number of position registrations during high-speed movement. It is to provide a digital cordless telephone that can.

[0012]

A digital cordless telephone according to the invention of claim 1 judges whether or not location registration is required after synchronizing with a radio base station, and if this is required, the location information of the own machine is displayed. In order to solve the above-mentioned problems, the position determination is performed by a synchronization determination unit that determines that the same base station is continuously synchronized for a certain period of time. After the determination that it is necessary, the synchronization determination means is provided with a delay control means for delaying the location registration until it determines that the synchronization of the same base station is continued for a certain period of time.

According to the above configuration, when it is determined that the location registration is necessary after synchronizing with the radio base station, the location determination is not executed immediately as in the conventional case, but the synchronization determination means is the same base station. Is monitored, and the delay control means delays the execution timing of the position registration until it determines that the synchronization with the same base station has continued for a certain period of time. Therefore, the location registration is executed only when the synchronization with the same base station continues for a certain period of time, and the position registration is not executed when the synchronization with the same base station is lost before the certain period of time elapses.

As a result, by the time a fixed time elapses,
If you are moving at a high speed such as going out of the wireless communication area of the base station that established synchronization (out of synchronization), unnecessary location registration is not performed, so reduce the average power consumption during high speed movement. The standby time of the digital cordless telephone can be extended.

The digital cordless telephone according to the invention of claim 2 determines whether or not the location registration is required after synchronizing with the radio base station, and if this is necessary, transmits the location information of its own to the radio base station. In order to solve the above-mentioned problems, the synchronization determination means for determining that the same paging area has been synchronized for a certain period of time, and the determination that the location registration is necessary were made. Thereafter, the synchronization determination means is provided with a delay control means for delaying the position registration until it is determined that the synchronization determination means has been synchronized within the same paging area for a certain period of time.

Here, being in the same paging area for a certain period of time means that the state of being synchronized with any of the base stations belonging to the same paging area continues for a certain period of time. Therefore, even if the base station A is out of synchronization with another base station B, the other base station B must belong to the same paging area as the base station A that was previously synchronized. For example, it means that they are continuously synchronized in the same paging area. On the other hand, in other cases, that is, the above-mentioned another base station B has been previously synchronized with the base station A.
Belongs to a paging area different from that of base station A
If it cannot be synchronized with any base station after being out of synchronization with (corresponding to moving out of service area)
Will not be synchronized within the same paging area.

According to the above configuration, when it is determined that the location registration is necessary after synchronizing with the radio base station, the location registration is not executed immediately as in the conventional case, but the synchronization determining means calls the same simultaneous call. The delay control means delays the execution timing of the position registration until the synchronization in the area is monitored and it is determined that the same paging area has been synchronized for a certain period of time. . Therefore, the location registration is executed only when the same paging area is synchronized for a certain time, and the location registration is not executed when the same paging area is out of synchronization.

As a result, by the time the fixed time elapses,
If you are moving at a high speed such as going out of the same paging area, unnecessary location registration will not be performed, so you can reduce the average power consumption during high speed movement, and the standby time of the digital cordless phone. Extend.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] The following will describe one embodiment of the present invention with reference to FIGS. 1 to 3.

A mobile communication system (so-called personal handyphone system) according to an embodiment of the present invention.
Is a plurality of base stations forming a service area of a wireless line,
It is composed of a digital cordless telephone that wirelessly communicates with these base stations. The wireless communication area of one base station (range within which radio waves of the base station reach) is usually an area having a radius of about 100 m to 500 m centered on the base station, and a plurality of bases to which the same paging area number is assigned. A paging area is formed by the stations.

The LCCH downlink superframe is periodically transmitted from each base station. This LCCH superframe is a BCCH (Broadcast Control Chan).
channel), SCCH (Signalling Control Channel), and PCH (Paging Channel). FIG. 3 shows the configuration of the control physical slot in which the above-mentioned function channels that are LCCH elements are set, and the BCCH (downlink) / PCH (downlink) channel coding format.

In the case of BCCH (downlink) or PCH (downlink), 42 is assigned to the CAC (control signal) of the control physical slot.
A calling identification code of bits is set, and n is set in the calling identification code.
_It contains the _P- bit paging area number. Although not shown, the SCCH (downlink) also includes the same calling identification code as above.

As described above, each functional channel of the LCCH downlink superframe includes a paging area number, and the digital cordless telephone receives and analyzes these functional channels to identify itself. Recognize the paging area, and determine whether or not the location is registered. In addition, the digital cordless telephone of the present embodiment,
Even if it determines that location registration is necessary, it does not immediately execute it, but it monitors the synchronization duration after establishing synchronization with the base station, and controls the timing of location registration as described in detail below. (Delay control of location registration) is performed and location registration is not performed during high-speed movement (when moving at a speed at which the line connection status cannot be maintained), and location registration is executed only when it is not. It has become so.

The structure of this digital cordless telephone is
A description will be given based on FIG.

In the digital cordless telephone, a radio section 1 for transmitting and receiving radio waves to and from a radio base station (not shown), a modulation / demodulation section 2 for modulating / demodulating a transmission / reception signal, and dividing a received signal into each channel to assemble data. Alternatively, a channel codec unit 3 that composes transmission data, a synchronization control unit 4 that performs intermittent reception control in synchronization with a base station, a location registration control unit 5 that performs location registration control, a control unit 6 that controls the whole, and a location registration simultaneous broadcast. The storage unit 7 stores a calling area number and operation data, a timer unit 8 that performs timer processing such as delaying location registration, and a user interface unit 9.

The location registration control unit 5 determines whether or not to perform location registration for the synchronized base stations in the synchronization control unit 4 based on the paging area number, and determines that location registration is necessary. Even when this is done, this is not executed immediately, but is executed after waiting for the position registration delay process in the control unit 6.

The control unit 6 as the synchronization determination unit and the delay control unit is composed of, for example, a microcomputer, and by monitoring the synchronization duration time using the timer unit 8, it is confirmed that the same base station is synchronized for a certain period of time. Judge,
The position registration is delayed until the continuation of synchronization for the same base station for a certain time is judged, and after this judgment, the position registration in the position registration control unit 5 is permitted.

In the above description, the synchronization control unit 4, the position registration control unit 5, and the control unit 6 are configured independently of each other, but they may be configured by a single microcomputer, for example.

The location registration control of the digital cordless telephone having the above-mentioned configuration will be described below with reference to the flowchart of FIG.

First, the digital cordless telephone starts control for establishing synchronization with the base station when the power is turned on (S
1) The synchronization with the base station is established by receiving and analyzing the broadcast channel (BCCH) of the LCCH superframe transmitted from the base station (S2). If the synchronization cannot be established (NO in S2), the process of S1 is repeated until the synchronization is successfully established.

Next, when the synchronization is established (YE at S2)
S) By comparing the paging area number of the synchronizing base station with the paging area number of the last position registration stored in the storage unit 7 to determine whether the location registration is necessary, The registration control unit 5 makes a determination (S3). Here, when the paging area number of the synchronizing base station and the stored paging area number of the registered location match, it is not necessary to newly execute the location registration (S
(NO in step 3), shifts to a standby state for monitoring incoming calls (S
4).

On the other hand, in S3, if the paging area number of the synchronizing base station does not match the paging area number stored in the storage unit 7, it is necessary to newly register the location (S3). Then YES). In this case, instead of immediately executing location registration as in the conventional case, first,
The timer unit 8 starts the time counting operation of the delay timer (the delay timer time here is 15 seconds) (S
5). Then, after the timer is started, it is synchronized with the same base station (S6), and the time-out of the delay timer is monitored (S6).
8).

Here, if the synchronization from the same base station is lost by the time-out (YES in S7), the process returns to S1 without performing location registration and the synchronization establishment process is performed again. Loss of synchronization from the same base station means that the digital cordless telephone has moved out of the wireless communication area of the base station, and such a situation occurs within a fixed time set by the timer. Occurs when a digital cordless telephone crosses the wireless communication area at a high speed (a speed at which the line connection cannot be maintained).

On the other hand, when the delay timer times out due to the synchronization with the same base station being maintained for a certain period of time (YES in S8), location registration is executed at this point (S9). When the position registration process is completed, the process is restarted from the synchronization establishment process (S1).

In the above, the set time of the delay timer is
The time is not limited to 15 seconds and can be set arbitrarily. The set time of the delay timer, that is, the monitoring time of the synchronization maintaining state for the same base station is based on the size of the wireless communication area of one base station and the lower limit of the moving speed at which the line connection state cannot be maintained, The optimum value is derived. Therefore, for example, if the wireless communication area of each base station becomes wider, the time required to pass through the area becomes longer accordingly, so that it is necessary to set the synchronization maintenance state monitoring time longer. If the lower limit of the speed at which the line connection status cannot be maintained becomes higher (that is, if the system can maintain the line connection status even when moving at a higher speed), the monitoring time for the synchronization maintenance status is correspondingly increased. Need to be short.

As described above, the digital cordless telephone of the present embodiment does not perform location registration immediately after it determines that location registration is necessary, but monitors the synchronization continuation time with respect to the same base station. However, the location registration is delayed, and the location registration is performed only when the synchronization with the same base station continues for a certain period of time, so that the following effects are achieved. That is, for example, when a person carrying a digital cordless telephone is moving at such a high speed that he / she cannot maintain the line connection state, the simultaneous paging area zone transition is repeated at short time intervals. In such a situation, the synchronization with the same base station is lost within the delay timer time set by the timer unit 8 (YE in S7).
S) Since the location registration process is not performed, location registration with transmission operation is not frequently performed as in the conventional case, and the average power consumption can be reduced. As a result, the standby time of the digital cordless telephone can be extended more than before.

[Second Embodiment] The following description will explain another embodiment of the present invention, mainly with reference to FIGS. 2 and 4. For convenience of description, members having the same configurations and functions as those of the members shown in the drawings of the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted.

In the digital cordless telephone of the present embodiment, even when it is determined that the location registration is necessary, the digital cordless telephone does not immediately execute the location registration but performs the delay control of the location registration. It is like this. The difference from the first embodiment is that in the first embodiment, the synchronization continuation time with the same base station is monitored to perform timing control of location registration, whereas in the present embodiment, the same paging area is used. The point is to perform timing control of position registration by monitoring the synchronization continuation time with the base station.

The basic configuration of the digital cordless telephone of this embodiment is the same as that of the first embodiment shown in FIG. 2, and the only difference is the delay control of the position registration performed by the control unit 6. . In the present embodiment, the control unit 6 determines that the base station belonging to the same paging area has been synchronized for a certain time by monitoring the synchronization time using the timer unit 8, and after this determination, the position registration is performed. The position registration in the control unit 5 is permitted.

Next, the position registration control of the digital cordless telephone will be described below with reference to the flowchart of FIG. The difference from the flowchart of FIG. 1 is that the same base station synchronization processing in S6 of FIG. 1 is the same paging area synchronization processing of S10 in FIG. 4, and as shown in FIG. 4 is different from the judgment criterion of out-of-sync with S11.

In S7 of FIG. 1, it is judged whether or not the same base station (the base station synchronized in the synchronization establishing process of S1) has lost synchronization, and when the synchronization with the base station is lost, the synchronization is lost immediately. On the other hand, in S11 of FIG. 4, it is determined that there is no out-of-sync while synchronizing with a base station belonging to the same paging area, and a base station belonging to another paging area is determined. It is judged that there is an out-of-sync when the synchronization is achieved. That is, in the same paging area synchronization processing of S10 in the present embodiment, even if the synchronization with the base station is once lost, the synchronization establishment processing (processing similar to S1) is immediately performed to establish a synchronization with another base station. If the synchronization is established and the newly synchronized base station belongs to the same paging area at this time, it is determined in S11 that the synchronization is not lost.
On the contrary, if the paging area number of the synchronized base station is different after the synchronization with the base station is once lost, or if it cannot be synchronized with any base station after the synchronization with the base station is lost (that is, , If you move out of the service area)
Judges that these are out of synchronization.

Processing until delay timer start (S1 to S
5) is the same as the processing in FIG. The time of the delay timer set in S5 is set longer than the timer setting time of the first embodiment. This is because the paging area is wider than the wireless communication area of one base station, and the timer monitoring time is long to recognize whether the digital cordless telephone crosses the paging area at high speed within a certain time. It is necessary to do so.

After the timer is started, it is synchronized with the base stations in the same paging area (S10), and the timeout of the delay timer is monitored (S8). If the base station in the same paging area is out of synchronization (YES in S11), the process returns to S1 without performing position registration. If it is determined that there is an out-of-sync because the paging area numbers of the synchronized base stations are different after the out-of-sync with the base station, synchronization with the base station has already been established at this point. Therefore, the processing of S1 and S2 can be skipped.

On the other hand, when the delay timer times out due to the state of being synchronized with any of the base stations within the same paging area being maintained for a certain period of time (YES in S8), position registration is performed at this point. Execute (S9).
When the location registration process ends, the synchronization establishment process (S1)
Start over.

As described above, the digital cordless telephone according to the present embodiment does not perform the location registration immediately after it determines that the location registration is required, but rather the base station in the same paging area. The position registration is delayed while monitoring the state of being synchronized with the station, and the position registration is performed only when this synchronized state continues for a certain time. Therefore, as in the first embodiment, a person who carries a digital cordless telephone If you are moving at a high speed that can not maintain the line connection state, you can reduce the average power consumption without performing frequent location registration as in the past. The standby time of a cordless phone can be extended.

In each of the above embodiments, the delay timer is started after the location registration is required. However, in order to delay the location registration processing, it is necessary to determine whether or not location registration is required. Other flows such as starting a delay timer are also conceivable.

[0047]

As described above, the digital cordless telephone according to the invention of claim 1 requires the synchronization determination means for determining that the same base station is continuously synchronized for a certain period of time and the location registration. After the determination is made, the synchronization determination means is provided with a delay control means for delaying the position registration until the synchronization determination for the same base station is continued for a certain time.

Therefore, when the mobile terminal is moving at a high speed so as to move out of the wireless communication area of the base station with which synchronization is established before a certain time elapses, unnecessary position registration is not carried out. It is possible to reduce the average power consumption when moving and to extend the standby time of the digital cordless telephone as compared with the conventional case.

As described above, in the digital cordless telephone according to the invention of claim 2, it is determined that the synchronization determination means for determining that the same paging area has been synchronized for a certain period of time and the location registration are necessary. After that, the synchronization determination means includes a delay control means for delaying the position registration until the synchronization determination means determines that the same paging area has been synchronized for a certain period of time.

Therefore, if the user is moving at a high speed so that he / she goes out of the same paging area before a certain period of time elapses, unnecessary position registration is not carried out, so that the average power consumption at the time of the high speed movement. And the standby time of the digital cordless telephone can be extended as compared with the conventional case.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a flowchart showing position registration control of a digital cordless telephone.

FIG. 2 is a block diagram showing a configuration of a main part of the digital cordless telephone.

FIG. 3 is an explanatory diagram showing a configuration of a control physical slot and a coding format of a functional channel set in the slot.

FIG. 4 shows another embodiment of the present invention and is a flowchart showing position registration control of the digital cordless telephone.

[Explanation of symbols]

 1 wireless unit 4 synchronization control unit 5 location registration control unit 6 control unit (synchronization determination unit, delay control unit) 7 storage unit 8 timer unit

Claims (2)

[Claims] 1. A digital cordless telephone for determining whether or not location registration is required after synchronizing with a wireless base station, and if this is required, transmitting position information of the own device to the wireless base station to perform location registration. After it is determined that synchronization is determined to be continuously synchronized with the same base station for a certain period of time and that location registration is required, the synchronization determination means determines that synchronization of the same base station is continued for a certain period of time. And a delay control means for delaying the position registration until. 2. A digital cordless telephone for determining whether or not location registration is required after synchronizing with a wireless base station, and if this is required, transmitting position information of the own device to the wireless base station to perform location registration. The synchronization determination means for determining that the same paging area has been synchronized for a certain period of time, and the synchronization determination means for synchronizing the same paging area for a certain period of time after it is determined that location registration is necessary. A digital cordless telephone, comprising: delay control means for delaying location registration until it is determined.