JPH0530023A - Automatic position registration method for cellular telephone set - Google Patents

Abstract

PURPOSE:To save useless power consumption by accessing a base station for automatic position registration when a current reception electric field from the base station is larger than a preceding reception electric field. CONSTITUTION:This reception electric field value RSS1-C and a preceding reception electric field value RSS1-P are compared (ST17). The preceding reception electric field value RSS1-P is set to 0 at the first position registration after application of power to a cellular telephone set. As the result of comparison, in the case of RSS1-C<RSS1-P, the cellular telephone set reaches the standby state of (ST1). Moreover, in the case of RSS1-C<RSS1-P, the processing is advanced (ST5) to activate a transmitter and the telephone number of its own station is sent to a base station to await an ACK signal from the base station (ST6). When the call is finished, after the preceding reception electric filed value RSS1-P is replaced with the reception electric field value RSS1-C (ST18), the operating system is checked (ST16) and the telephone set restores again to the standby state to await further processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically registering the location of a cellular telephone in a cellular telephone system.

[0002]

2. Description of the Related Art FIG. 4 shows, for example, US Pat. No. 4,972,3.
Fig. 55 is a flowchart showing a conventional automatic location registration method for a cellular phone shown in the specification of No. 55. In the figure, S
T1 is a step for putting a cellular phone in a standby state, S
T2 is a step of detecting the reception of the master clock count value sent from the system, and ST3 is the detected master clock count value and the next position registration count value (hereinafter referred to as NEXT) possessed by the cellular phone.
REG)).

ST3 is a step of capturing a channel having the best reception electric field in a predetermined channel.
Step 5 is a step of turning on the transmitter and transmitting a position registration signal including the telephone number of the cellular telephone to the base station on the channel. ST6 is an affirmative response (hereinafter referred to as ACK) from the base station to the transmission of the location registration signal.
A step of detecting a signal, ST7 is a step of turning off the transmitter when an ACK signal is not detected,
ST8 is a step of monitoring the number of times the position registration signal is transmitted.

ST9 is a step of waiting for a confirmation message from the base station by turning off the transmitter when an ACK signal is detected, and ST10 is a step of judging the success or failure of the location registration by this confirmation message. S
T11 is a step of detecting a release message from the base station when the location registration is not successful, and ST1
2 is a step of monitoring the elapse of a predetermined time (5 seconds).

ST13 and ST14 are the above-mentioned NEXT
The step of updating the contents of REG by the sum of the master clock count value and the random number, ST15 is also N
This is a step of updating the content of EXT REG with the sum of the master clock count value and the offset value, and S
T16 is a step of checking the system used.

Next, the operation will be described. Since the cellular telephone provides a service capable of communicating with a general line, the location of its own station must be registered with the system. The location registration informs the system of the number of the currently active cellular telephone when the cellular telephone is idle.

The location registration is performed at various time intervals, and this time interval is determined by the master clock count value of the system and the NEXT REG of each cellular telephone itself. The master clock count value is periodically sent by the system to all active cellular phones using location registration messages. Also, the NEXT REG of the cellular phone is used as a threshold value for determining the next automatic location registration.

When the cellular telephone receives the master clock count value from the system, this value is NEXT RE.
Compared with G, if the master clock count value is N
If equal to or greater than EXT REG, the cellular phone will access the base station for location registration.

The details will be described below with reference to the flowchart shown in FIG. First, in steps ST1 to ST3,
The cellular phone receives the master clock count value from the system during standby and sends it to the NEXT REG
It is determined whether location registration is necessary by comparing with. In this process, the master clock count value is NEXT REG.
Continue until the same or exceed.

To perform location registration, the cellular phone then scans in step ST4 to find the best field channel in a given channel band. This is because it may have moved to another service area since the last scan. The quality of this channel is determined by the received electric field.

When the best channel is seized, in steps ST6 to ST9, the cellular telephone turns on the transmitter a fixed number of times until the ACK signal from the base station is received, and the telephone number of its own station is located. It is transmitted to the base station as a registration signal. At that time, the system may request transmission of the serial number at the same time, and the serial number is transmitted to the base station together with the telephone number in the position registration signal. Each of these steps is a cellular telephone and system handshaking process.

When the ACK is received, steps ST9-
In ST12, the cellular telephone is
For a second), waiting for a confirmation message from the base station for the location registration signal, if a message is received within this time, it is determined in step ST10 that location registration is successful. If the location registration is successful, the NEXT REG of the cellular telephone becomes the master clock count value plus the offset value in step ST15. After updating the value of NEXT REG, the system used is checked in step ST16 and the process is returned to step ST1. This causes the cellular phone to return to standby and continue receiving again until the master clock count value exceeds NEXT REG.

If the reception of the release message from the base station is detected in step ST11 or the lapse of 5 seconds is detected in step ST11 before the position registration is successfully determined in step 10, in step ST13. NEXT RE
After setting a value obtained by adding a random number to the master clock count value to G, the process returns to step ST1 through step ST16.

Further, if the ACK signal from the base station is not obtained even after completion of the reply of the specified number of times for the cellular telephone in step 8, NEXT REG in step ST14.
Is set to a value obtained by adding a random number to the master clock count value, after which the processing returns to step ST1 via ST16, and the cellular telephone enters the standby state.

While steps ST5 to ST8 are repeated, the cellular telephone is transmitting its own number to the base station for position registration, and a considerable current is required to turn on the transmitter each time the signal is transmitted. Consumed. This is not a problem for an on-vehicle cellular phone because it uses an external power source, but it greatly affects the usage time for a cellular phone that uses a battery.

[0016]

Since the conventional automatic location registration method for cellular telephones is configured as described above, when the cellular telephone is in a weak reception electric field area around the wireless zone or when the traffic of the system is lost. Even if the transmission signal from the cellular telephone cannot be received at the base station due to a high level, the NEXTREG of the cellular telephone will be updated, so the next master clock value will be the corresponding NE clock value.
Until the XT REG is exceeded, the cellular phone has a problem that it cannot inform the system that it is in operation.

The present invention has been made to solve the above-mentioned problems, and in the case where the reception of the ACK signal for the transmission signal from the base station cannot be detected when the location registration of the cellular telephone is performed. When the location registration is unsuccessful, location registration can be performed again when the next master clock count value is received, and when the location registration is unsuccessful in the peripheral area of the wireless zone where the reception electric field value is small, the location registration can be performed depending on the reception electric field. An object of the present invention is to obtain an automatic location registration method for a cellular phone capable of preventing wasteful power consumption by performing the following automatic location registration.

[0018]

According to a first aspect of the present invention, there is provided an automatic position registration method for a cellular phone, wherein an ACK from a base station is sent to a position registration signal transmitted from the cellular phone.
If no signal is received, the cellular telephone will be NEXT
While returning to the standby state without updating REG,
When the current reception electric field value from the base station is larger than the previous reception electric field value, the automatic location registration access to the base station is performed.

Further, in the automatic location registration method of the cellular telephone according to the invention described in claim 2, the access for the automatic location registration to the base station is performed by the reference reception electric field value in which the current reception electric field value from the base station is predetermined. This is done when the value is larger than the value.

Further, in the automatic location registration method of the cellular telephone according to the invention as defined in claim 3, the access for the automatic location registration to the base station is performed such that the current reception electric field value is the previous reception electric field value or the reference reception electric field value. On the other hand, if it is larger than the above, it is performed.

[0021]

In the cellular telephone according to the invention described in claim 1, when the ACK signal from the base station for the location registration signal is not obtained, the cellular phone returns to the standby state without updating the NEXT REG, and Re-enable automatic location registration access when the master clock count value is received, and perform the automatic location registration access when the current received electric field value from the base station is larger than the previous received electric field value. By doing so, it is possible to realize an automatic location registration method for a cellular phone that can prevent wasteful power consumption.

In the cellular telephone according to the present invention as set forth in claim 2, the automatic location registration access is performed when the current reception electric field value from the base station is larger than the reference reception electric field value, thereby eliminating waste. The automatic location registration method of a cellular phone that can prevent unnecessary power consumption is realized.

In the cellular telephone according to the third aspect of the present invention, the automatic location registration access is performed when the current received electric field value from the base station is larger than either the previous received electric field value or the reference received electric field value. By doing so, it is possible to realize an automatic location registration method for a cellular phone which can prevent wasteful power consumption.

[0024]

EXAMPLES Example 1. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart showing an embodiment of the invention described in claim 1, and the same steps as those in FIG. 4 are designated by the same step numbers to avoid duplicated description.

In the figure, ST17 is a step of comparing the current received electric field value RSSI-c with the previous received electric field value RSSI-p, and ST18 is the step of comparing the previous received electric field value RSSI-p.
updating -p with the current received field value RSSI-c,
ST19 is a step of setting "0" to the previous reception electric field value RSSI-p.

Next, the operation will be described. Step ST
For the cellular phone in the standby state in step 1,
When it is detected that the master clock count value is received from the system at T2, the value is set to N at step ST3.
It is compared with EXT REG to determine whether the master clock count value exceeds NEXT REG.

As a result, if not exceeded, this process (steps ST1 to ST3) is repeated as it is. Also, if it exceeds the limit, the cellular phone will go to step ST.
At 4 a channel scan is performed to find the best channel within a given channel band and the best channel is captured. In that case, the quality of the channel is determined by the received electric field.

Next, in step ST17, the current received electric field value RSSI-c and the previous received electric field value RSSI-p are compared. Here, the previous reception electric field value RSSI-p is set to "0" at the time of the first position registration after the cellular phone is powered on. If "RSSI-c <RSSI-p" as a result of the comparison, the cellular phone returns to the standby state in step ST1. If "RSSI-c>RSSI-p", the process proceeds to step ST5, the transmitter is turned on, the telephone number of the own station is transmitted to the base station, and in step 6, the ACK signal from the base station is waited for. .

If there is no ACK signal from the base station, the transmitter is turned off once in step ST7, and it is determined whether or not the number of transmissions defined in step 8 has been completed. If not completed, the process is returned to step 5 and the process of steps ST5 to ST8 is repeated. On the other hand, if completed, the previous reception electric field value RSSI-p is replaced with the reception electric field value RSSI-c at this time in step ST18, then the system used is checked in step 16, and the standby state of step 1 is again set. It returns to and waits until the next master clock count value is received.

In step ST6, an ACK is sent from the base station.
If the reception of a signal is detected, the transmitter is turned off in step 9 to wait for a confirmation message from the base station, and if the cellular phone receives a location registration confirmation message from the base station in step 10. If so, the location registration is successful. If the location registration is successful, N is returned in step 15.
After the EXT REG is replaced with the sum of the master clock count value and the offset value, and the reception electric field value RSSI-p is set to "0" in step 19, the process proceeds to step S.
Passed to T16.

Here, in the process of steps ST10 to ST11, when the release message is received from the base station or the position registration confirmation message from the base station is not received within the predetermined time (5 seconds),
In step 13, replace the contents of NEXTREG with the master clock count value plus a random number,
Go to step 19. After checking the system to be used in step 16, the process returns to the standby state of step 1 and the next position registration process is repeated.

Example 2. FIG. 2 is a flow chart showing an embodiment of the invention described in claim 2, in which the current received electric field value R
Step ST17 of comparing SSI-c with the previous reception electric field value RSSI-p is replaced with step ST20 of comparing the present reception electric field value RSSI-c with a predetermined reference reception electric field value RSSI-s. 1 is different from the embodiment shown in FIG.

Therefore, step ST1 of updating the previous reception electric field value RSSI-p with the current reception electric field value RSSI-c.
8 and the step ST19 of setting the reception electric field value RSSI-p of the last time to "0" is unnecessary.

As a result, the current received electric field value RSSI
-P is less than the standard received electric field value RSSI-s, and such a position with a high probability of location registration failure when the location registration is unsuccessful in an area of a weak electric field such as the periphery of the wireless zone. Location registration from will not be repeated automatically.

Example 3. FIG. 3 is a flowchart showing an embodiment of the invention described in claim 3, which is a combination of the embodiment shown in FIG. 1 and the embodiment shown in FIG. That is,
When it is determined in step ST17 that the current reception electric field value RSSI-c is equal to or smaller than the previous reception electric field value RSSI-p,
Further, in step ST20, the current received electric field value RS
The SI-c is compared with the reference received electric field value RSSI-s.

Therefore, the current received electric field value RSSI-c is
Previous received electric field value RSSI-p or reference received electric field value RSSI
If greater than one of -s, automatic location registration access is performed.

In this case, the previous received electric field value RS
Step ST18 for updating SI-p with the current received electric field value RSSI-c and step ST19 for setting the previous received electric field value RSSI-p to "0" are necessary.

[0038]

As described above, according to the present invention, when the ACK signal for the transmitted location registration signal is not obtained, the NEXT REG is not updated and the standby state is restored and the current received electric field is received. When the value is larger than the previous received electric field value or the reference received electric field value, or one of them, it is configured to access the base station for automatic location registration. If unsuccessful, it becomes possible to re-register the location when the next master clock count value is received, and it is possible to reduce location registration failure in weak electric field areas such as the peripheral area of the wireless zone. It is possible to obtain an automatic location registration method for a cellular phone that can save unnecessary power consumption and extend the usage time of the cellular phone that uses a battery.

[Brief description of drawings]

FIG. 1 is a flowchart showing an automatic location registration method for a cellular phone according to an embodiment of the invention described in claim 1.

FIG. 2 is a flowchart showing an embodiment of the invention described in claim 2;

FIG. 3 is a flowchart showing an embodiment of the invention described in claim 3.

FIG. 4 is a flowchart showing a conventional automatic location registration method for a cellular phone.

[Explanation of symbols]

ST2 Step for detecting reception of master clock count value ST3 Set master clock count value to NEXT RE
Step ST5 of comparing with G Step ST5 of turning on the transmitter and transmitting a position registration signal ST6 Step of detecting reception of ACK signal ST15 Step ST17 of setting the sum of master clock count value and offset value in NEXT REG Step ST17 Current reception electric field Step ST20 of comparing the value with the previous received electric field value Step ST20 Step of comparing the present received electric field value with the reference received electric field value

Claims (3)

[Claims] 1. A cellular telephone system comprising a plurality of base stations and a cellular telephone moving within a service area formed by a radio zone covered by each base station, comprising: The master clock count value of the system is transmitted to the cellular phone in the standby state, and the cellular phone compares the master clock count value with the next position registration count value that each has, and the comparison result concerned. Based on the above, the location registration signal including the telephone number of the own station is transmitted to the base station to perform the automatic location registration, and then the next location registration count value is updated, so that the next time is set at a predetermined time interval. In the automatic location registration method of a cellular telephone for accessing the location registration, the location registration signal is transmitted by the cellular telephone. In contrast, when the acknowledgment signal from the base station is not obtained, the cellular phone returns to the standby state without updating the location registration count value next time, and the current reception electric field from the base station is received. The value is compared with the previous received electric field value, and if the current received electric field value is larger than the previous received electric field value, the automatic location registration access to the base station is performed. Method. 2. A cellular telephone system provided with a plurality of base stations and a cellular telephone that moves within a service area formed by a radio zone covered by each of the base stations. The master clock count value of the system is transmitted to the cellular phone in the state, and the cellular phone compares the master clock count value with the next location registration count value that each has, and the comparison result is obtained. Based on the above, the location registration signal including the telephone number of the local station is transmitted to the base station to perform the automatic location registration, and then the next location registration count value is updated, so that the next time the location In an automatic location registration method for a cellular telephone that performs location registration access, the location registration signal is transmitted by the cellular telephone. On the other hand, when the acknowledgment signal from the base station is not obtained, the cellular phone returns to the standby state without updating the next location registration count value and the current reception electric field value from the base station. Is compared with a predetermined reference received electric field value, and if the current received electric field value is larger than the reference received electric field value, the automatic location registration access to the base station is performed. Method. 3. A cellular telephone system comprising a plurality of base stations and a cellular telephone moving within a service area formed by a radio zone covered by each of the base stations. The master clock count value of the system is transmitted to the cellular phone in the standby state, and the cellular phone compares the master clock count value with the next position registration count value that each has, and the comparison result concerned. Based on the above, the location registration signal including the telephone number of the own station is transmitted to the base station to perform the automatic location registration, and then the next location registration count value is updated, so that the next time is set at a predetermined time interval. In the automatic location registration method of a cellular telephone for accessing the location registration, the location registration signal is transmitted by the cellular telephone. In contrast, when the acknowledgment signal from the base station is not obtained, the cellular phone returns to the standby state without updating the location registration count value next time, and the current reception electric field from the base station is received. The value is compared with the previous received electric field value and the reference received electric field value, and if the current received electric field value is greater than one of the previous received electric field value and the reference received electric field value, the automatic location registration access to the base station is performed. A method for automatically registering a location of a cellular phone, which is characterized by performing.