JP2665194B2 - MCA system and location registration method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital multi-channel access (hereinafter referred to as MCA) which is a land mobile communication system in which a large number of users jointly use a plurality of radio channels.
Abbreviation) and a method of registering the location of the mobile station.

[0002]

2. Description of the Related Art As shown in FIG. 8, an MCA system of this type includes a plurality of mobile stations N1 (in this case, only one is shown), a command station P serving as a center of these mobile stations, and a predetermined station. And a relay station A to E provided in each of the zones a to e for relaying communication between the mobile station and the command station. In FIG. 8, the mobile station N1 having the command station P as the center is currently located in the zone e, and the relay station A and the command station P and the relay station E and the mobile station N1 are connected by a radio line. A to E are connected by a wired line.

Conventionally, when inter-zone communication is performed from a command station to a mobile station in a zone different from the command station, a system code for identifying the system of each relay station and a mobile station for identifying each mobile station are used. The station identification number is used in the radio signal from the command station to the relay station. The system code is composed of a 4-bit area code and a 12-bit system number. The mobile station identification number is composed of a 4-bit area code, a 2-bit identifier, a 9-16 bit subscription number, and a 10-17 bit individual number. Consists of The identifier indicates the allocation of the total 26 bits of the number of bits used for the accession number and the individual number. In the relay station, a system code and an identification number of a mobile station operable corresponding to the system code are registered.

[0004] This system code corresponds to a zone number, and the individual number of the mobile station identification number differs for each system code. Therefore, an individual number of one mobile station changes for each zone. In the same user, when performing individual communication with a mobile station having a command station, call connection fails if the target mobile station is not within the calling zone of the command station. This is because the command station cannot recognize the zone in which the target mobile station is located, which hinders reliable communication with the target mobile station.

In such a case, non-designated communication between zones is used. This is a method in which the zone number is not specified at the time of calling, and the relay station of the calling zone transmits the search for the individual number of the specified mobile station to the adjacent relay stations one after another by the following function of the specified mobile station at the relay station. is there. The relay station that has received the information transmits the incoming request for the designated mobile station in its own zone as an access channel common to all mobile stations on the downlink control channel (ch) as a search operation, and transmits the received mobile station without knowing which zone it is in. Communication to the station is realized.

Generally, a command station installed in an office or the like is a "parent" as viewed from a mobile station within the same user, and one of the functions is management of the mobile station. However, in the current digital MCA system, since the mobile station does not have a function similar to the polling operation of notifying the location of the mobile station, the command station determines the zone where each mobile station is currently located. Can not be recognized.

FIG. 9 is a sequence chart of signals when performing inter-zone communication from the command station P to the mobile station N1 in FIG. 8, and it is assumed that the mobile station N1 is located in the zone of the relay station E. In FIG. 9, a radio signal is shown between the relay station and the mobile station or the command station, and a wired signal is shown between the relay stations. First, the relay station A, which has received a connection request from the command station P to the mobile station N1 without designation between zones, transmits the inter-zone connection request to the relay station B. The relay station B sends an incoming request signal assuming that the mobile station N1 is in its own zone, but cannot receive an incoming response signal because the mobile station N1 does not exist. Hereinafter, similar processing is performed in relay stations C and D. Since the mobile station N1 is present, the relay station E receives an incoming response signal to the incoming request signal, and notifies the relay station A of permission for inter-zone connection. The command station P talks with the relay station A, and the mobile station N1 talks with the relay station E.
The communication link is established by the designated signal, and the communication state is entered.

[0008]

However, when the above-mentioned individual communication without a zone is executed when a large number of mobile stations are present, the operation rate of the relay station increases, and the slot of the downlink control channel is increased. Will occupy a lot.
In addition, since the relay station performs a search operation even when the designated mobile station does not exist in its own zone, communication is difficult from the viewpoint of the calling side command station, especially when a large number of relay stations are installed. It takes time to establish a link. in this way,
There is a problem in terms of substantially reduced available slots as well as efficient use of frequencies and quick call connections.

An object of the present invention is to provide an MCA system and a position registration method for an MCA system in which a command station can easily recognize the current position of a mobile station immediately when it is unclear in which zone other than its own zone the target mobile station is located. Is to provide.

[0010]

An MCA system according to the present invention comprises a plurality of mobile stations, a command station serving as a center of these mobile stations, and a mobile station and a command station provided for each predetermined zone. MC with relay station for relaying communication
In the A system, the mobile station sends a polling signal to the command station when the mobile station goes out of the service area once and it is determined that the zone where the mobile station is located is different from the zone detected last time. Polling processing means for making an automatic call request, and transmission signal generating means for recognizing the automatic call request and generating the polling signal, wherein the command station is assigned as a unique number in each zone of each mobile station. An allocation table for storing the assigned identification numbers in association with each mobile station, a polling data list for storing each mobile station in association with a zone in which the mobile station is currently located, and an identification table previously input from input means. Assignment table writing processing means for writing a number into the assignment table;
Polling notification means for recognizing that the received signal is an automatic call by polling from the mobile station; and extracting the identification number from the data received together with the polling signal, searching the allocation table, and finding a zone number corresponding to the matched number. And a polling data analysis processing means for writing and updating the corresponding address of the polling data list.

Further, the location registration method in the MCA system according to the present invention is characterized in that a plurality of mobile stations, a command station serving as a center of these mobile stations, and a mobile station and a command station provided for each predetermined zone are provided. In a digital MCA system having a relay station for relaying communication, when the mobile station detects a zone change, automatically calls the command station,
The command station extracts the identification number of the calling mobile station from the incoming call request signal transmitted from the relay station, and refers to a predetermined assignment table by the identification number to assign the corresponding mobile station name and zone number. And updating the zone number written in the address of the memory corresponding to the same mobile station name as the determined mobile station name to the determined zone number. After detecting the drop, the mobile station recognizes again that the reception electric field level has reached the specified value, and recognizes that the relay station that has been connected to this mobile station has been changed. judge.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. Since the system configuration of one embodiment of the present invention is the same as that of the conventional example shown in FIG. 8, the illustration is omitted, but the internal configurations of the mobile station and the command station of one embodiment of the present invention are shown in FIGS. 1 and 2, respectively. .

In FIG. 1, a mobile station includes a transmitting / receiving unit 1 for receiving and transmitting a radio signal, an encoding unit 2 for encoding the received signal, and a software program stored in a ROM (not shown) in advance. A CPU for controlling the operation of the mobile station itself. The CPU 3 includes a line monitoring control unit 4 for monitoring the state of the wireless line, a reception signal analysis unit 5 for analyzing a received signal, an in-range notification transmission / reception unit 6 for recognizing in-range detection, and a method in which the mobile station goes out of range once. A polling processing unit 7 for making an automatic call request by a polling signal to a command station when it is determined that the zone where the mobile station is located is different from the previously detected zone.
A polling call request transmission / reception unit 8 for recognizing an automatic call request, and a transmission signal creation unit 9 for generating a polling signal to the command station.

In FIG. 2, a command station includes a transmitting / receiving unit 11 for receiving and transmitting a radio signal, an encoding unit 12 for encoding the received signal, and a software program stored in a ROM (not shown) in advance. A CPU 13 for operationally controlling the command station itself, a polling data buffer 21 for temporarily storing polling data from the mobile station,
An allocation table 22 for storing an identification number assigned as a unique number in each zone of each mobile station in association with each mobile station, and polling data for storing each mobile station in association with the zone in which this mobile station is currently located List 23 and handset 2 for inputting data to allocation table 22
4 is provided.

A CPU 13 monitors a state of a wireless line, a line monitoring control unit 14, a received signal analyzing unit 15 that analyzes a received signal, and recognizes that an incoming call is an automatic call by polling from a mobile station. The polling notification transmission / reception unit 16 retrieves the identification number from the data received together with the polling signal, retrieves the allocation table 22, finds the zone number corresponding to the matched number, and writes / updates the zone number in the corresponding address of the polling data list 23. An analysis processing unit 17, a mobile station allocation table writing processing unit 18 for writing the identification number input from the handset 24 into the allocation table 22, a zone number in which a call request to the mobile station is received and the mobile station is currently located Request receiving section 19 for obtaining
And a transmission signal generation unit 20 for generating a radio signal to be transmitted
And

FIG. 3 is a diagram showing an example of assignment of identification numbers for each zone of each mobile station in the same user, and FIG. 4 is a diagram showing an example of an assignment table, which has the same contents as FIG. ) Is written into the memory. In the command station, the mobile station identification number of each mobile station is registered in advance for each area served by each relay station. That is, as shown in FIG. 4, the contents of FIG. 3 are written and used as a table for the command station to determine which mobile station is currently in which zone from the mobile station identification number. For example, the mobile station N1 has the mobile station identification number “4200002” in the zone a (zone number 2039) under the umbrella of the relay station A.
3 "indicates that the mobile station identification number is" 72000124 "in the zone b (zone number 3108) under the umbrella of the relay station B. That is, the mobile station identification number “720”
In the case of “00124”, it is uniquely determined that the mobile station N1 is in the zone b.

The originating mobile station identification number is the identification number of the mobile station that has requested communication with the relay station, and is always carried on the downlink incoming request signal from the relay station in any communication. Therefore, whenever a mobile station makes a communication request, the other party always recognizes its own mobile station number. The present invention utilizes this to automatically make a call for individual communication from the mobile station to the command station at the time of zone switching, and notifies the mobile station identification number after zone switching.

Based on the mobile station identification number after the zone switching, the zone number where the mobile station is currently located in the polling data list shown in FIG. 5 is written and updated. The address in FIG. 5 indicates an address of a memory corresponding to each of the mobile stations N1 to Nn.
Indicates that the user is currently in the zone number “3108”.

The above-mentioned allocation table and polling data list are constituted by an EEPROM in order to avoid loss of data due to power-off or power failure.

It is also possible to configure so that the automatic calling of polling at the time of zone switching is performed for all mobile stations within the same user, but this is considered from the viewpoint of effectively using a finite radio channel. Therefore, it is determined that the destination of the automatic call is only a command station which is basically operated in a single fixed zone.

Hereinafter, the operation of the mobile station and the command station will be described. FIG. 6 is a flowchart showing a location registration update procedure on the mobile station side of the MCA system according to one embodiment of the present invention. First, when approaching a zone boundary or the like, the mobile station detects a decrease in the received electric field level (step 1: S
1) Recognize which station is currently transmitting the downlink control signal (S2). Once the downlink control signal cannot be accurately received due to the deterioration of the receiving sensitivity, the mobile station goes out of the service area once.However, as the mobile station moves, the reception electric field level in the adjacent zone rises, and it is determined whether or not the specified value has been reached. It is determined (S3), and if it is equal to or greater than the specified value, the relay station transmitting the downlink control signal at this time is recognized (S3).
4).

When the electric field level is equal to or higher than the specified value and the relay station differs between the processing of S2 and the processing of S4, it determines zone transfer (S5), and when the transfer is confirmed, automatically calls the command station (step S5). S6). If, for some reason, the mobile station goes out of the service area and returns to the same service area again, the relay station transmitting the control signal is the same, and the automatic call is not executed. That is, the mobile station is determined to be staying in the same zone, and no location registration update request is made.

FIG. 7 is a flowchart showing a location registration updating procedure on the MCA system command station side according to one embodiment of the present invention. First, the command station receives an incoming call request from the relay station (S11), and fetches a mobile station identification number from this signal (S12). Next, a process according to the same communication procedure as the normal process is executed (S13), and it is determined whether or not the received signal is a mobile station automatic call polling signal (S1).
4). If the result of the determination is a polling signal,
The name of the incoming mobile station is determined by referring to the assignment table based on the mobile station identification number (S15).

Next, similarly, the zone number is determined by referring to the allocation table from the mobile station identification code (S16). Based on the mobile station name and zone number, the corresponding address in the polling data list is written and updated as the zone information where the mobile station is currently located (S17), and the process ends.
Thus, the command station always stores the zone information where the mobile station is located in the polling data list.

Therefore, when a call is made from the command station to the mobile station, the command station simply specifies the name of the mobile station and refers to the polling data list to locate this mobile station from the mobile station name. Zones can be indexed. Then, the command station searches for the mobile identification number by referring to the assignment table, and adds the obtained mobile station identification number to the inter-zone communication request for the relay station and transmits the request, thereby efficiently communicating with the partner mobile station. A communication link can be established.

[0026]

As described above, according to the present invention, when a mobile station searches for a zone change, an automatic call is made to a command station, and this command station is used to search for an incoming request signal transmitted from a relay station. The identification number of the calling mobile station is taken out, the predetermined assignment table is referred to by the taken out identification number to find out the corresponding mobile station name and zone number, and the same mobile station name as the extracted mobile station name Is configured to update the zone number written to the address of the memory corresponding to the zone number to the indexed zone number, so even if it is unknown where the target mobile station exists in any zone other than the own zone, The command station can easily recognize the current position of the mobile station immediately. Therefore, it is possible to suppress inadvertent individual communication without zone designation.

[Brief description of the drawings]

FIG. 1 is a block diagram of a mobile station in an MCA system according to one embodiment of the present invention.

FIG. 2 is a block diagram of a command station in the MCA system according to one embodiment of the present invention.

FIG. 3 is a diagram illustrating an example of assignment of identification numbers for each zone of each mobile station within the same user.

FIG. 4 is a diagram showing an example of a mobile station identification number assignment table in a command station.

FIG. 5 is a diagram showing an example of a polling data list in a command station.

FIG. 6 is a flowchart showing a procedure of location registration update on the mobile station side of the MCA system according to one embodiment of the present invention.

FIG. 7 is a flowchart showing a procedure of location registration update on the MCA system command station side according to one embodiment of the present invention.

FIG. 8 is a system configuration diagram for explaining inter-zone communication in a conventional MCA system.

FIG. 9 is a sequence chart of signals when performing inter-zone communication from the command station to the mobile station in FIG. 8;

[Explanation of symbols]

 1,11 transmission / reception unit 2,12 encoding unit 3,13 CPU 4,14 line monitoring control unit 5,15 received signal analysis unit 6 area notification transmission / reception unit 7 polling processing unit 8,20 transmission signal creation unit 16 polling notification transmission / reception unit 17 Polling Data Analysis Processing Unit 18 Mobile Station Allocation Table Write Processing Unit 19 Transmission Request Receiving Unit 21 Polling Data Buffer 22 Allocation Table 23 Polling Data List 24 Handset

Claims (3)

(57) [Claims] An MCA comprising: a plurality of mobile stations; a command station serving as a center of these mobile stations; and a relay station provided for each predetermined zone and relaying communication between the mobile station and the command station. In the system, when the mobile station goes out of the service area once and the zone where the mobile station is located is different from the previously detected zone and is determined to be a different zone, the mobile station automatically sends a polling signal to the command station. Polling processing means for making a call request, and transmission signal creation means for recognizing the automatic call request and generating the polling signal, wherein the command station is assigned as a unique number in each zone of each mobile station. An allocation table that stores the identification numbers associated with each mobile station, and a polling data list that stores each mobile station and the zone in which this mobile station is currently located. Allocation table writing processing means for writing the identification number previously input from the input means into the allocation table; polling notifying means for recognizing that the received signal is an automatic call by polling from the mobile station; Polling data analysis processing means for retrieving the identification number from the received data, retrieving the allocation table, determining a zone number corresponding to the matched number, and writing and updating the corresponding address in the polling data list. MCA system. 2. A digital system comprising: a plurality of mobile stations; a command station serving as a center of the mobile stations; and a relay station provided for each predetermined zone and relaying communication between the mobile station and the command station. In the MCA system of the system, when the mobile station detects the zone change, automatically calls the command station,
The command station extracts the identification number of the calling mobile station from the incoming call request signal transmitted from the relay station, and refers to a predetermined assignment table by the identification number to assign the corresponding mobile station name and zone number. And updating the zone number written in the memory address corresponding to the same mobile station name as the determined mobile station name to the determined zone number. 3. The mobile station detects that the reception electric field level has reached a specified value again after detecting the decrease of the reception electric field level, and the relay station connected to this mobile station is changed. 3. The location registration method in the MCA system according to claim 2, wherein the mobile terminal recognizes the fact that the mobile station has changed the zone.