JP2664821B2 - Automatic location registration method for cellular phones - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 4 shows, for example, U.S. Pat.
55 is a flowchart illustrating a conventional method for automatically registering the location of a cellular phone disclosed in Japanese Patent No. 55-55. In the figure, S
T1 is a step of putting the 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 a step of detecting the detected master clock count value and the next location registration count value (hereinafter referred to as NEXT) of the cellular phone.
REG).

[0005] ST4 is a step of acquiring a channel having the best reception electric field among predetermined channels.
Step 5 is a step of turning on the transmitter and transmitting a location registration signal including the telephone number of the cellular telephone to the base station on the channel. ST6 is an acknowledgment (hereinafter referred to as ACK) from the base station for the transmission of the location registration signal.
ST7 is a step of turning off the transmitter when no ACK signal is detected,
ST8 is a step of monitoring the number of transmissions of the location registration signal.

[0004] ST9 is a step of turning off the transmitter when an ACK signal is detected and waiting for a confirmation message from the base station. ST10 is a step of judging the success or failure of location registration based on the confirmation message. S
T11 is a step of detecting a release message from the base station when the location registration is not successful.
Reference numeral 2 denotes a step of monitoring the elapse of a predetermined time (5 seconds).

[0005] ST13 and ST14 correspond to the NEXT
The step of updating the contents of the REG by the sum of the master clock count value and the random number.
In this step, the content of the EXT REG is updated by the sum of the master clock count value and the offset value.
T16 is a step of checking the system being used.

Next, the operation will be described. In order to provide a service that allows a telephone to communicate with a general line, a cellular phone must register its location with the system. The location registration informs the system of the number of the currently operating cellular telephone when the cellular telephone is on standby.

[0007] The location registration takes place in various time intervals, which are determined by the system's master clock count value and the NEXT REG of each cellular telephone itself. The master clock count value is periodically transmitted from the system to all active cellular telephones using location registration messages. The NEXT REG of the cellular phone is used as a threshold for determining that the next automatic location registration will be performed.

When the cellular telephone receives a master clock count value from the system, this value is
G and if the master clock count value is N
If it is equal to or greater than the EXT REG, the cellular telephone accesses the base station to perform location registration.

Hereinafter, a detailed description will be given according to a 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.
To determine if location registration is required. This process is performed when the master clock count value is NEXT REG.
Until they are the same or exceed.

Next, to perform location registration, the cellular telephone scans in step ST4 to search for the best electric field channel in a predetermined channel band. This is because the last scan may have moved to another service area. The quality of this channel is determined by the received electric field.

When the best channel is acquired, in steps ST6 to ST9, the cellular phone turns on the transmitter a predetermined number of times until an ACK signal is received from the base station, and locates its own telephone number. The registration signal is transmitted to the base station. 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 location registration signal. Each of these steps is the process of handshake between the cellular telephone and the system.

When ACK is received, steps ST9 to ST9 are performed.
In ST12, the cellular phone waits for a predetermined time (5
(Seconds), and waits for a confirmation message from the base station for the position registration signal. If the message is received within this time, it is determined that the position registration is successful in step ST10. If the location registration is successful, the NEXT REG of the cellular telephone becomes a value obtained by adding the offset value to the master clock count value in step ST15. After updating the value of NEXT REG, the system used is checked in step ST16, and the process returns to step ST1. This causes the cellular phone to return to standby and continue receiving again until the master clock count exceeds NEXT REG.

Before the location registration is determined to be successful in step 10, if the reception of a release message from the base station is detected in step ST11, or if the lapse of 5 seconds is detected, the process proceeds to 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 via step ST16.

On the other hand, if the ACK signal from the base station is not obtained even after the specified number of replies of the cellular telephone have been completed in step 8, the NEXT REG is set in step ST14.
Is set to a value obtained by adding a random number to the master clock count value, and thereafter, the process returns to step ST1 via ST16, and the cellular phone enters a standby state.

While repeating steps ST5 to ST8, the cellular telephone transmits its own number to the base station for location registration, and a considerable amount of current is generated because the transmitter is turned on every time the signal is transmitted. Consumed. This is not a problem for an in-vehicle cellular phone because an external power supply is used, but has a significant effect on the operating time of a battery-powered cellular phone.

[0016]

Since the conventional automatic location registration method for a cellular telephone is configured as described above, when the cellular telephone is in the area of the weak reception electric field around the radio zone or when the traffic of the system is low. Even if the transmission signal from the cellular telephone cannot be received by the base station due to a high level or the like, the next master clock value of the cellular telephone is updated because the NEXTREG of the cellular telephone is updated.
Until the XT REG is exceeded, there is a problem that the cellular phone cannot inform the system that it is operating.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems.
When an ACK signal as a response from the base station cannot be detected and the location registration processing is unsuccessful, the received electric field value at this time is estimated by the received electric field value at which the transmission signal from the cellular telephone does not reach the base station. When the received electric field value received by the most sensitive electric field channel of the cellular phone is smaller than the value stored in the memory at the next position registration processing, the automatic position registration processing is executed. An object of the present invention is to provide a method for automatically registering a location of a cellular phone, which can prevent useless power consumption by returning to a standby state without performing the process.

[0018]

According to a first aspect of the present invention, there is provided an automatic location registration method for a cellular telephone, wherein the base station transmits an ACK to a location registration signal transmitted from the cellular telephone.
If the signal is not obtained, and registered as a measure of the received electric field value that can not be transmitted and received between the current reception electric field value cellular telephone and the base station, together with the return to the wait receiving state, the current reception electric field from the base station When the value is smaller than the previous reception electric field value, access to automatic location registration to the base station is not performed.

According to a second aspect of the present invention, there is provided an automatic location registration method for a cellular telephone, comprising the steps of:
The electric field value is smaller than the predetermined reference reception electric field value
Access to the base station for automatic location registration.
It was made not to let them.

Furthermore, the automatic position registering method of a cellular phone according to the invention of claim 3, the current reception electric field value is pre
Less than one of the received electric field values or the reference received electric field value
Access to the base station for automatic location registration.
It was made not to let them.

[0021]

The cellular telephone according to the first aspect of the present invention cannot transmit and receive the current received electric field value between the cellular telephone and the base station when an ACK signal from the base station for the position registration signal is not obtained. registered as a measure of the received electric field value, together with the return to the wait receiving state, when the current reception electric field value from the base station is smaller than the reception electric field value of the previous, so as not to access the automatic location registration to the base station By doing so, an automatic location registration method for a cellular phone that can prevent wasteful power consumption is realized.

In the cellular telephone according to the second aspect of the present invention , the current reception electric field value from the base station is determined in advance.
Base station
An automatic location registration method for a cellular phone that can prevent wasteful power consumption by realizing an automatic location registration access to a mobile phone is realized.

In the cellular telephone according to the third aspect of the present invention, the current reception electric field value is the previous reception electric field value.
Or one of the reference reception electric field values,
An automatic location registration method for a cellular phone that can prevent wasteful power consumption by preventing access to automatic location registration for the cellular phone is realized.

[0024]

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a flow chart showing one embodiment of the first aspect of the present invention. The same steps as those in FIG. 4 are denoted by the same step numbers to avoid redundant description.

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

Next, the operation will be described. Step ST
In step S1, the cellular phone in the standby state in step 1
When it is detected at T2 that the master clock count value has been received from the system, the value is set to N at step ST3.
It is compared with EXT REG to determine whether the master clock count value has exceeded NEXT REG.

As a result, if not exceeded, this process (steps ST1 to ST3) is repeated. If it exceeds, the cellular telephone proceeds to step ST.
In step 4, a channel scan is performed to find the best channel within a predetermined channel band to acquire the best channel. 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 is compared with the previous received electric field value RSSI-p. Here, at the time of the first location registration after the power of the cellular phone is turned on, the previous received electric field value RSSI-p is set to “0”. As a result of the comparison, if “RSSI-c <RSSI-p”, the cellular phone returns to the standby state in step ST1. If "RSSI-c>RSSI-p", the process proceeds to step ST5 to turn on the transmitter, transmit the telephone number of the own station to the base station, and wait for an ACK signal from the base station in step 6. .

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 specified in step 8 has been completed. If not completed, the process returns to step 5, and the process of steps ST5 to ST8 is repeated. On the other hand, if the process has been completed, the previous received electric field value RSSI-p is replaced with the received electric field value RSSI-c at this time in step ST18, then the system to be used is checked in step 16, and the standby state in step 1 is returned again. And waits until the next master clock count value is received.

In step ST6, ACK is sent from the base station.
If the reception of the signal is detected, the transmitter is turned off in step 9 and the apparatus is in a state of waiting for a confirmation message from the base station. If the cellular phone receives the location registration confirmation message from the base station in step 10, In this case, the location registration is successful. If the location registration is successful, N
After the EXT REG is replaced by the sum of the master clock count value and the offset value, and “0” is set to the received electric field value RSSI-p in step 19, the process proceeds to step S
It is passed to T16.

Here, in the process of steps ST10 to ST11, when a release message is received from the base station or when a location registration confirmation message from the base station is not received within a predetermined time (5 seconds),
In step 13, the content of NEXTREG is replaced with a value obtained by adding a random number to the master clock count value,
Proceed to step 19. Then, after checking the used system in step 16, the process returns to the standby state in step 1 and repeats the next location registration process.

Embodiment 2 FIG. FIG. 2 is a flow chart showing one embodiment of the invention according to claim 2, wherein the current received electric field value R
The step ST17 of comparing the SSI-c with the previous received electric field value RSSI-p is replaced with a step ST20 of comparing the current received electric field value RSSI-c with a predetermined reference received electric field value RSSI-s. This is different from the embodiment shown in FIG.

Therefore, step ST1 of updating the previous received electric field value RSSI-c with the current received electric field value RSSI-c.
Step ST19 of setting "8" and "0" to the previous received electric field value RSSI-p becomes unnecessary.

Thus, the current received electric field value RSSI
If the location registration is unsuccessful in an area with a weak electric field such as the periphery of a wireless zone where -p is less than or equal to the reference received electric field value RSSI-s, such a location with a high probability of location registration failure The location registration from will not be automatically repeated.

Embodiment 3 FIG. FIG. 3 is a flow chart showing an embodiment of the invention according to claim 3, which is a combination of the embodiment shown in FIG. 1 and the embodiment shown in FIG. That is,
If it is determined in step ST17 that the current reception electric field value RSSI-c is equal to or less than the previous reception electric field value RSSI-p,
Further, in step ST20, the current reception 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 it is larger than one of -s, access for automatic location registration is performed.

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

[0038]

As described above, according to the present invention, when an ACK signal for a transmitted location registration signal is not obtained, the current reception electric field value cannot be transmitted and received between the cellular telephone and the base station. Register as a guide for the electric field value, return to the standby state, and if the current received electric field value is smaller than the previous received electric field value or the reference received electric field value, or one of them, the base station Is configured so as not to perform automatic location registration access to the server. If the location registration is unsuccessful due to the non-detection of the ACK signal, the location registration may be performed again when the next master clock count value is received. It also enables the use of battery-powered cellular telephones by reducing location registration failures in areas with weak electric fields, such as the periphery of wireless zones, thereby reducing unnecessary power consumption. The effect of automatic position registering method of a cellular phone that can extend between is obtained.

[Brief description of the drawings]

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

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

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

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

[Explanation of symbols]

ST2: Step of detecting reception of master clock count value ST3: NEXT RE
Step of comparing with G ST5 Step of turning on the transmitter to transmit the position registration signal ST6 Step of detecting the reception of the ACK signal ST15 Step of setting the sum of the master clock count value and the offset value to NEXT REG ST17 Current reception electric field ST20: Step of comparing the current received electric field value with the reference received electric field value

Claims (3)

(57) [Claims] 1. A cellular telephone system comprising: a plurality of base stations; and a cellular telephone that moves within a service area formed by a wireless zone covered by each of the base stations. A system master clock count value is transmitted to the cellular phone in a standby 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 base station, a location registration signal including the telephone number of the own station is transmitted to the base station to perform automatic location registration, and then the next location registration count value is updated. In the automatic location registration method for a cellular phone performing the location registration access, transmitting the location registration signal by the cellular phone When said acknowledgment signal from the base station is not obtained, and registers the current reception electric field value as a measure of the received electric field value that can not be transmitted and received between the cellular telephone and the base station with respect to, wait receiving state When returning to the next location registration, the received electric field value from the base station is compared with the previous received electric field value at the next location registration, and if the received electric field value from the base station is smaller than the previous received electric field value, An automatic location registration method for a cellular telephone, wherein access to automatic location registration is not performed. 2. A plurality of base stations, in the cellular telephone system including a cellular telephone which each base station moves within the service area formed by a radio zone that covers respectively, from the base station A system master clock count value is transmitted to the cellular phone in a standby 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 base station, a location registration signal including the telephone number of the own station is transmitted to the base station to perform automatic location registration, and then the next location registration count value is updated. the Te location registration of the automatic location registration method smell cellular telephone to be accessed, the cellular telephone, said at position registration base station Compare the current reception electric field value with a predetermined reference reception electric field value, and if the reception electric field value is smaller than the reference reception electric field value , return to the standby state without performing the automatic location registration access to the base station. An automatic location registration method for a cellular telephone. 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. A system master clock count value is transmitted to the cellular phone in a standby 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 base station, a location registration signal including the telephone number of the own station is transmitted to the base station to perform automatic location registration, and then the next location registration count value is updated. In the automatic location registration method for a cellular phone performing the location registration access, transmitting the location registration signal by the cellular phone When said acknowledgment signal from the base station is not obtained, and registers the current reception electric field value as a measure of the received electric field value that can not be transmitted and received between the cellular telephone and the base station with respect to, wait receiving state And at the next position registration, the received electric field value from the base station is compared with the previous received electric field value and the reference received electric field value, and the received electric field value from the base station is compared with the previous received electric field value and the reference received electric field value. Wherein the automatic location registration access to the base station is not performed when the value is smaller than one of the following.