JP2762978B2 - Location registration method in mobile communication - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a location registration system in mobile communication, and more particularly to a location registration system for processing a location registration request generated when a large number of mobile terminals move simultaneously.

[0002]

2. Description of the Related Art In recent mobile communications, as the number of subscribers increases due to its widespread use, cells are miniaturized in order to effectively utilize limited radio resources. In order to make and receive calls to and from a mobile, location registration indicating which cell the mobile is in is required. Since location registration frequently occurs with the downsizing of the cell and the usage rate of the radio control channel is reduced, various proposals have been made to reduce the number of location registrations.

As a prior art for reducing the number of location registrations, Japanese Patent Application Laid-Open No. 5-3581 discloses a method of reducing control traffic by setting location registration areas autonomously and decentralized. 5-19134
In Japanese Patent Application Publication No. 4 (1994), when a user of a mobile terminal registers data indicating a use time zone in which the terminal is used and a service area division (cell) to be used in a radio base station, and an incoming call to the mobile terminal occurs, A method is disclosed in which a control channel is used without using a location registration signal by confirming whether or not a registered time zone is met and calling a registered cell.

[0004]

In any of the above-mentioned conventional mobile location registration methods, any of them is effective for reducing the signal load on the network and for improving the efficiency of the radio resources, but has a margin for the control channel. Without it, it does not work well and may not be able to perform location registration. However, the mere expansion of the control channel causes the transmission to the location register (the location registration area storage device in JP-A-5-3581 or the memory device in JP-A-5-191344) to concentrate, causing a congestion state. Reduces network performance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is intended to improve the success rate of registration by efficiently performing position registration of the moving object. An object of the present invention is to realize a location registration method in communication.

[0006]

SUMMARY OF THE INVENTION A location registration system in mobile communication according to the present invention comprises a plurality of base stations each accommodating a plurality of mobile terminals and connected to a network, and a plurality of base stations connected to the base station when the mobile terminals move. In a location registration method in mobile communication comprising a location register in which a location is registered, a channel provided for the mobile terminal and for performing location registration in the location register when the mobile terminal moves has an empty channel. When it is confirmed that there is no channel monitoring means, the channel monitoring means for notifying the base station of the absence, a channel state detecting means provided in the base station for detecting a channel state, and the channel monitoring means provided in the base station When notified of the shortage of the location registration channel, based on the detection result of the channel state detection means,
Channel assignment changing means for changing all vacant channels except for the logical channel currently used for communication for location registration, provided in the mobile terminal, for the location registration in the channel assignment changing means. And location registration executing means for performing location registration using the changed channel.

In this case, the channel assignment changing means includes:
When the number of mobile terminals requesting position registration matches the number of registered positions, the channel assignment may be restored.

The channel assignment changing means may not change the channel assignment for location registration when the location register is overloaded.

[Operation] In the present invention configured as described above, if the location registration channel is insufficient, all the vacant channels except the logical channel currently used for communication are used for location registration. Therefore, a congestion state can be prevented, and the success rate of location registration becomes high.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the configuration of one embodiment of the present invention.

In FIG. 1, a network monitoring device 110 for monitoring a network state is provided in a network 100.
And the base station 120 and the location register 140 are connected.

The network monitoring device 110 includes a network interface 111 for exchanging signals with the network 100, a network monitoring unit 112 for monitoring a network state, and information required to process signals received from the network 100. A signal judging section 113 for judging whether the information is included, an information judging section 115 for processing information included in the received signal, and an information report judging section 115
An information storage unit 117 that stores information in response to a command from the server, a timer 116 used for monitoring network status and processing stored information, and a command sending unit 114.

The base station 120 is a network interface 1 for exchanging signals with the network 100.
21, the network monitoring device 110, and the mobile terminal end 13
0, a signal determination unit 123 that processes signal information from 0, a channel assignment change unit 122 that changes assignment of a wireless channel, a channel state detection unit 124 that detects a state of a wireless channel, and a mobile terminal 130. A wireless interface 125 for exchanging signals is provided.

The mobile terminal 130 includes a radio interface 131 for exchanging signals with the base station 120, a location registration execution unit 132 for allocating radio channels, and a channel monitoring unit 133 for monitoring the status of radio channels. ,
Signal determination unit 13 that processes signal information from base station 120
4 and a user display unit 135 for displaying information to a user in accordance with a command from the signal determination unit 134.

Next, the specific operation of this embodiment will be described with reference to FIGS. FIG. 2 is a flowchart showing an operation when changing the wireless channel in the present embodiment, and FIG. 3 is a flowchart showing an operation when prohibiting or canceling the position registration.

When a large number of mobile terminals 130 requiring location registration move to the wireless area managed by the base station 120 and a location registration disabled state occurs due to a shortage of control channels, the channel monitoring unit 133 of the mobile terminal 130 sets the channel registration unit 133 in advance. When a shortage of channels for a predetermined time Ta or more is observed (step S
201), a location registration impossible message is transmitted to the base station 120 and the neighboring mobile terminals using the broadcast channel, indicating that location registration is impossible (step S).
202).

The base station 120 that has received the location registration impossible message from the mobile terminal 130 adds its own base station number to the location registration impossible message and sends it to the network monitoring device 110. In the network monitoring apparatus 110, the signal determining unit 113 determines that the received message is a location registration impossible message, and determines the base station number in the information determining unit 11.
5 When the network is not in the location registration prohibited state, the information determination unit 115 determines that the location registration is impossible based on the number of the location registration disabled base station 120 indicated by the number given to the location registration disabled message and the reception history up to that time. The number of changed terminals is stored in the information storage unit 117, and the timer 116 is started to start measuring the location registration impossible time (step S203).

When the number of terminals whose location cannot be registered becomes equal to or greater than the threshold value Ka within a predetermined observation period Tb, the command sending unit 114 sends a radio channel assignment change message to the base station 120 to change the radio channel assignment. And the number of location registration requesting terminals. The signal determination unit 123 of the base station 120 that has received the radio channel assignment change message acquires information on the currently used communication channel, control channel, and data channel from the channel state detection unit 124, and sends the information to the channel assignment change unit 122. Send information. The channel assignment change unit 122 that has acquired the channel information forcibly sets a channel other than the channel currently used for the call as the location registration channel (step S204), and can perform notification and location registration to that effect, but perform communication. The service information indicating that the service is not available and the number of terminals in service and the number of terminals that cannot receive service are transmitted to all mobile terminals 13 in the wireless area.
Send to 0.

Each mobile terminal 130 that has received the channel assignment change message executes location registration using the location registration channel forcibly assigned by location registration executing section 132, and performs signal registration section 134. Based on the received service information, the user is informed that the service is unavailable, the number of terminals currently in service, and the number of unavailable terminals. On the other hand, the base station 120 that has received the location registration message measures the number of terminals that have performed location registration in the signal determination unit 123 (step S205), and determines the same number of locations as the number of location registration request terminals acquired from the network monitoring device 110. It is determined whether or not registration has been performed, and when the number of location registration requesting terminals and the number of location registration terminals become the same (step S206), the channel assignment is changed by the channel assignment changing unit 122 and restored (step S20).
7).

Next, another operation for preventing the occurrence of congestion in the signal network due to concentration of the location registration request message in the location register in the present embodiment will be described with reference to FIG.

The network monitoring device 110 transmits signal information flowing through the signal line to the network interface 111.
And the signal determination unit 113 determines the content of the obtained signal. If the signal determination unit 113 determines that the acquired signal is a position registration signal to the location register 140, it passes the information of the acquired signal to the information determination unit 115. The information judging unit 115 acquires information of a predetermined observation period Tc from the timer 116, and when a position registration message having a processing capacity of the location register 140 or more continuously flows for a predetermined period Td or more during the observation period Tc ( Step S301), the instruction sending unit 114 sends the base station 1
A position registration prohibition message for prohibiting position registration in the location register 140 is transmitted to each of the address registers 20 (step S302). Location register 1
Base station 12 that has received a location registration prohibition message to
0 is set in the location register 14 by the signal determination unit 123.
The location registration prohibition to 0 is determined. Thereafter, the mobile terminal 1
The information determining unit 123 of the base station 120 that has received the position registration request from the base station 30 determines whether or not the position registration is to be performed on the location register 140. Notify that service is not possible due to congestion (step S
303). In response to this, the user display unit 135 of the mobile terminal 130 notifies the subscriber by displaying that the service is currently stopped (step S304).

Thereafter, when the information determining unit 115 recognizes that the number of position registration signals in the location register 140 has decreased to the processing capability of the location register 140 or less (step S305), the command transmitting unit 114 causes the base station 1 to issue an instruction.
A position registration restart message indicating that the position registration has been restarted is sent to each of the terminals 20 (step S306). In response to this, the mobile terminal 130 notifies that the service has started (step S307).

By notifying the subscriber of the location registration prohibition / cancellation operation as described above, the occurrence of a new location registration request can be prevented, and the congestion state is prevented from becoming worse.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

This embodiment shows a case in which mobile communication is performed by an intelligent network (IN), and includes a signaling network 401, a location register 402, mobile switching centers 403 to 405, a network monitoring and control device 406, and base stations 407 to 407. 409 and mobile terminals 410 to 412 existing in the wireless area of each base station.

The base stations 407 to 409 provided for the mobile switching center 403 include radio areas 413 to 4 respectively.
15, and the mobile switching center 403 manages a location registration area 416 including wireless areas 413 to 415. A plurality of base stations are provided for the mobile switching center 404 and the mobile switching center 405, and each mobile switching center 404 is provided.
405 manages a location registration area composed of a base station wireless area provided for each.

Each mobile switching center 403 to 405 communicates with a service switching point (S) in the intelligent network.
SP), and accesses a location register 402 as a service data point (SDP) via a signal network 401. Each mobile switching center 403-4
05 is connected to the network monitoring and control device 406 via the signal network 401 or directly. The network monitoring control device 406 is in charge of a network monitoring control function, and a plurality of network monitoring control devices exist depending on the scale of the network.
Each base station 407-409 and mobile terminal 410-41
The function of the base station 120 according to the first embodiment shown in FIG.
And the mobile terminal 130. Each mobile switching center 4
03 to 405 have a function of transmitting / receiving a location registration signal to / from the location register 402 and the network monitoring / control device 406.
06 has the same function as the network monitoring device 110 shown in FIG. The functions of the location register 402 and the signal network 401 are the same as those of the sound and work 10 shown in FIG.
0 and the same as the location register 140.

[0028]

Since the present invention is configured as described above, it has the following effects.

The success rate of the location registration request is improved, and the number of stations whose location is unknown is reduced. For this reason, various services are easily provided, and the service quality is improved. Further, since the number of simultaneous calls is reduced, the load on the network can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a system configuration according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a wireless channel changing operation in the embodiment shown in FIG.

FIG. 3 is a flowchart showing a location registration prohibition / release operation in the embodiment shown in FIG. 1;

FIG. 4 is a diagram showing a system configuration according to a second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 network 120 base station 121 network interface 122 channel assignment changing unit 123 signal determining unit 124 channel state detecting unit 125 wireless interface 130 mobile terminal 131 wireless interface 132 location registration executing unit 133 channel monitoring unit 134 signal determining unit 135 user display unit 140 Location register S201 to S207, S301 to S307 Step 401 Signal network 402 Location register 403 to 405 Mobile switching center 406 Network monitoring control unit 407 to 409 Base station 410 to 412 Mobile terminal 413 to 415 Wireless area 416 Location registration area

Claims (3)

(57) [Claims] 1. A location register in mobile communication, comprising a plurality of base stations each accommodating a plurality of mobile terminals and connected by a network, and a location register for registering a location of the mobile terminal when the mobile terminal moves. In the system, provided in the mobile terminal, when the mobile terminal has moved, when confirming that there is no free channel for performing position registration to the location register, a channel that notifies the base station to that effect Monitoring means, provided in the base station, a channel state detection means for detecting a channel state; provided in the base station, when the channel monitoring means is notified of shortage of the location registration channel, the channel state Based on the detection result of the detecting means, all the available channels except the logical channel currently used for communication are registered. Channel assignment changing means for changing for recording, and position registration executing means provided in the mobile terminal and performing position registration using the channel changed for position registration by the channel assignment changing means. A location registration method in mobile communication characterized by the following. 2. The location registration method in mobile communication according to claim 1, wherein the channel assignment changing means determines the channel assignment based on the channel assignment when the number of the mobile terminals requesting the location registration matches the registered number. A location registration method in mobile communication characterized by returning to the above. 3. The mobile communication system according to claim 1, wherein the channel assignment changing means does not change the channel assignment for position registration when the location register is overloaded. Location registration method.