JPH11196473A - Mobile station for radio communication and mobile radio communication system using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain quick control by preventing a time till setup of a dialing condition from being increased while collision of signals is avoided even when power is applied simultaneously to pluralities of mobile stations. SOLUTION: A storage means 103 stores an individual number that is a number specific to each mobile station. A reception means 101 receives and demodulates an outgoing radio signal from a master station (radio base station). A count control means 102 is operated simultaneously at application of power to mobile stations, sets the number of counts of zone signals (area information signals) from the master station based on each individual number stored in the storage means 103, and gives an instruction of starting count to a count means 104. The count means 104 counts down zone signals received through the reception means 101 and the count control means 102 and reports it to a transmission control means 105 when the count reaches zero. The transmission control means 105 instructs transmission of a position registration signal to a transmission means 106. The transmission means 106 modulates the signal and sends the modulated signal to the master station as a radio signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication mobile station and a mobile radio communication system using the same, and more particularly, to a communication start of a radio communication mobile station transmitting in synchronization with a downlink signal transmitted from a radio base station. Means and a mobile radio communication system in which communication start timings between a plurality of radio communication mobile stations are different.

[0002]

2. Description of the Related Art Generally, when a mobile communication system using a radio wave as a transmission medium is constructed, location registration of a mobile station (notifying an information signal of the mobile station to a master station (base station)) is performed. However, when a plurality of mobile stations transmit signals at the same timing, signal collision occurs. Therefore, in this type of conventional mobile communication system, the master station transmits a timing signal for permitting transmission from the mobile station, and the mobile station matches the content and number of the timing signal with the internally generated random number. Only when this is done, the operation of activating the transmission of the mobile station is performed (see Japanese Patent Application Laid-Open No. 7-250083).

[0003]

In the above-mentioned prior art, since random numbers are used, even in a system of a small number of mobile stations where there is little chance of signal collision, the condition for each mobile station to make a call is not reached. It could take a lot of time.
That is, there is a possibility that a considerable time is required for the control operation such as the position registration.

[0004] It is an object of the present invention to prevent a signal collision and prevent an increase in time until a transmission condition is satisfied, thereby enabling a quick control operation even when a plurality of mobile stations are simultaneously turned on. And a mobile radio communication system using the same.

[0005]

SUMMARY OF THE INVENTION A mobile station for radio communication according to the present invention is: a mobile station that transmits in synchronization with a downlink signal transmitted from a radio base station of a radio communication system; Storage means for storing a unique number; count means for counting down the number of downlink signals using the value of the unique number as an initial value; transmitting means for transmitting when the count result of the count means becomes 0 It has.

[0006] In the above configuration, the counting means may set a numerical value at a specific one or two digit position of the unique number as an initial value of the countdown, and Each time transmission is performed by the means, a specific digit position as the initial value is changed, or a predetermined specific signal of the downlink signal is used as a trigger to instruct the counting means to start counting. A configuration including count control means may be employed.

[0007] A mobile radio communication system according to the present invention comprises a radio base station and a plurality of radio communication mobile stations having the above configuration.
Even when the plurality of wireless communication mobile stations are powered on at the same time, a configuration is such that a location registration signal is transmitted to the wireless base station at different timings based on the countdown of the unique numbers.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a mobile station according to the present invention, and shows only parts related to the present invention. The storage unit 103 is configured by a ROM or the like, and stores an individual number which is a number unique to each mobile station in advance. Also, necessary data for creating a position registration signal is stored. The receiving means 101 receives and demodulates a radio signal (downlink signal) from a master station (wireless base station) not shown.
The count control means 102 operates when the mobile station is powered on, sets the count number of the zone signal (area information signal) sent from the master station based on the individual number in the storage means 103, Give instructions to start. The counting means 104 starts counting down the zone signals input through the receiving means 101 and the count control means 102, and when the result becomes 0, reports the fact to the transmission control means 105. Transmission control means 105
Instructs the transmitting means 106 to transmit a position registration signal.
Transmitting means 106 modulates the signal and transmits it to the master station as a radio signal.

Although not shown in FIG. 1, the mobile station 10 is connected to the receiving means 101 and the transmitting means 106, and transmits and receives radio frequency signals. Information input means;
It has means for performing operations at the time of making and receiving calls, and control means for controlling the operation of the entire mobile station, and can communicate with another mobile station or fixed station via the master station. Each of these means can be realized by a known technique, and a description thereof will be omitted.

FIG. 2 is a system configuration diagram showing an embodiment of the mobile radio communication system according to the present invention. In FIG. 2, the mobile radio communication system of the present example includes a master station 20 and a plurality of (only two mobile stations are shown) mobile stations 10 and 11.
0 and the mobile stations 10 and 11 perform mutual communication by radio signals. When the mobile stations 10 and 11 perform a position registration operation such as when the power is turned on, the zone signals 210, 211, 212,...
Receiving the location registration signals 110,
Send 111 to the master station.

FIG. 3 shows one mobile station, for example, mobile station 10.
Shows the timing when the position registration signal 110 is transmitted. Here, the unique individual number stored in the storage unit 103 by the mobile station 10 is “3”. A fixed time interval from the master station 20 (time for downlink signal: t1d, t2d, t3
..) are radiated into the wireless zone at zone signals 210, 211, 212,. Assuming that the mobile station 10 turns on the power just before the time t1d, the numerical value “3” given as the individual number is subtracted by “1” each time the zone signal is received, and the mobile station 10 immediately after receiving the third zone signal 212 At the timing of the time t3u for the uplink signal, a position registration signal 110 is transmitted to the master station 20.

FIG. 4 shows signal timings when a plurality of mobile stations transmit this position registration signal. It is assumed that the mobile stations 10 and 11 are powered on at the same time. Each mobile station 1
The transmission timings of 0 and 11 correspond to the position registration signal when the zone signal from the master station 20 is received by the number of times of the individual number (for example, “3”, “4”) stored in each mobile station. send. As a result, the transmission timing (t3u, t4u) of each mobile station 10, 11 becomes independent,
Signal collisions will be reduced.

In the present invention, even if a signal collision occurs due to a difference in the power-on timing of each mobile station or the like, as will be described later, the timing of re-transmission is generated with another digit as an initial value. Therefore, the signal collision eventually disappears. A specific method will be described with reference to the drawings.

FIG. 5 is a flowchart showing an example of a processing operation performed internally until the mobile station transmits a location registration signal. In the present embodiment, a case will be described where the own station number (individual number) has five digits.

The conditions when the mobile station transmits the location registration signal in synchronization with the zone signal transmitted from the base station (master station) are as follows:
The power-on time is raised (step 501).

The number of times of reception of the zone signal transmitted to the space at regular intervals is set by the first digit of the own station number stored individually by the mobile station (step 502).

Then, the reception count of the numerical value is performed (step 503).

The one-digit numerical value is any one of "0" to "9", and the corresponding number is counted.
In the case of (1), counting up to the next digit (second digit) is started.

If the count result does not become 0 within a predetermined time, the reception count is performed again with the set value.

When the counted result becomes 0, a position registration signal is transmitted to the base station device at a predetermined timing (step 504).

A registration completion signal (a signal transmitted from the mobile station and transmitted to the originating mobile station after the completion of the location registration) is received or not received from the base station apparatus within a predetermined time. Is determined (step 505).

If it can be received, the location registration is completed (step 506).

If reception is not possible, the number of receptions is set in the second digit of the own station number, and the reception of the zone signal sent from the base station is again counted down (step 50).
7).

The above-described series of operations are continuously performed.
The operation is repeated until the third, fourth, and fifth digits have been registered.

Next, an example of the location registration operation according to the present invention will be described with reference to FIG.

As shown in FIG. 6, A, B, C, D
There are four mobile stations.

Each different own station number (for example, 1032
1, 13312, 14131, and 16053) simultaneously start the registration operation by turning on the power simultaneously.

Looking at the first digit of the own station number, mobile station A is 1,
The mobile station B indicates 2, the mobile station C indicates 1, and the mobile station D indicates 3. The operation is to receive and count the number of zone signals from the base station by the number of times, and transmit a registration signal.

As for the mobile station B, the count result becomes 0 by receiving the second zone signal, and a position registration signal is transmitted. Because there is no collision with other signals,
The registration completion signal is immediately received from the base station, and the location registration is completed.

The mobile station A and the mobile station C transmit signals with the first zone signal, but signal collision occurs due to simultaneous transmission (602 in the figure). That is, the location registration signal does not reach the base station, and the registration operation fails.

Therefore, the registration operation is continuously performed, and the count of the second digit, that is, the mobile station A is 2 and the mobile station C is 3 and the reception countdown is started.

The mobile station C completes registration without signal collision, but the mobile station A collides again with the mobile station D and registration fails (603 in the figure).

Therefore, the registration operation is continuously performed in the same manner as described above, and the mobile station A sets the third digit, that is, 3 to the mobile station D.
Starts the reception countdown with the second digit, that is, 5.

As a result, both the mobile station A and the mobile station D have no signal collision and the registration is completed.

By performing such processing, signal collision due to simultaneous transmission is reduced, and the smaller the number of mobile stations, the faster and more reliable the registration.

[0037]

As described above, according to the present invention, the transmission timing is controlled by the numbers individually registered by the mobile stations, so that the collision of the location registration signal due to the simultaneous transmission from a plurality of mobile stations can be prevented. Can be prevented in advance.

Also, in the event of a signal collision, the registration operation with the individual number is repeatedly performed, so that the position registration can be completed quickly and reliably.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a mobile station according to the present invention.

FIG. 2 is a system configuration diagram showing one embodiment of the mobile radio communication system of the present invention.

FIG. 3 is a diagram showing a basic location registration operation of a mobile station.

FIG. 4 is a diagram showing the timing of a position registration signal.

FIG. 5 is a diagram illustrating a flow of a position registration signal transmission process of a mobile station.

FIG. 6 is a diagram showing a specific example of a registration operation.

[Explanation of symbols]

 10, 11 mobile station 20 master station 101 receiving means 102 count control means 103 storage means 104 counting means 105 transmission control means 106 transmitting means 110, 111 location registration signal 210, 211, 212 zone signal

Claims (5)

[Claims] 1. A mobile station which transmits in synchronization with a downlink signal transmitted by a radio base station of a mobile radio communication system, a storage means for storing a unique number pre-assigned to its own mobile station, A mobile station for radio communication, comprising: counting means for counting down the number of downlink signals with a numerical value as an initial value; and transmitting means for transmitting when the count result of the counting means becomes zero. . 2. The radio communication mobile station according to claim 1, wherein said counting means sets a numerical value at a specific one or two digit position of said unique number as an initial value of said countdown. . 3. The wireless communication system according to claim 1, further comprising: a count control unit that instructs the counting unit to start counting in response to a predetermined signal determined in advance among the downlink signals. Mobile station. 4. The mobile station for wireless communication according to claim 2, wherein said counting means changes a specific digit position as said initial value every time transmission is performed by said transmitting means. 5. A wireless base station and a plurality of claims 1, 2,
And the wireless communication mobile station according to 4 or 4, wherein even when the plurality of wireless communication mobile stations are simultaneously powered on, the wireless base station communicates with the wireless base station at different timings based on the countdown of the unique numbers. A mobile radio communication system for transmitting a location registration signal.