JPH06140985A - Frequency arrangement control system - Google Patents

Abstract

PURPOSE:To reduce man-hour of a check job of frequency arrangement by varying an equipment parameter for a base station and its adjacent station so as to cope with increase in number of waves of the base station and with increase in number of stations. CONSTITUTION:The algorithm (control) varying an equipment parameter of a base station such as a new transmission output, a tilt angle of antenna directivity and a height of the antenna is added to the algorithm calculating a desired power versus interference power ratio CIR for a talking use radio frequency signal f5 allocated attended with increase/decrease in the traffic between an optional radio base station 32 and a mobile equipment 52, a radio frequency arrangement for communication of all conventional base stations and its setting processing. Thus, the frequency arrangement for communication of each base station is automatically decided with respect to the increase/ decrease in the traffic of the mobile station 52 by a conventional optional base station 32, the frequency arrangement of the communication decided is as it is and the service area with respect to each mobile equipment of a base station 35 and adjacent base stations 33, 34 is changed to avoid the change of the frequency arrangement for communication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling allocation of radio frequencies for communication, which is applied to a mobile station such as a car telephone system, which is applied to a mobile communication system having a plurality of radio base stations. It relates to a control method.

[0002]

2. Description of the Related Art Conventionally, when introducing a mobile communication system,
Based on the construction plan of the radio base station and the prediction of the traffic of the mobile station, as shown in (a) the initial frequency arrangement diagram of FIG. 3, for example, five radio base stations 31 to 35 are provided with 12 radio frequencies in total. Of the f _{1 to} f ₁₂ , first four radio frequencies f _{1 to} f ₄
Are used for controlling each base station, and the remaining eight radio frequencies f _{5 to} f
₁₂ were fixedly assigned to each two frequencies for telephone calls. If it is necessary to increase the call frequency of an unplanned radio base station (addition of three call frequencies at the base station 32 in the figure), as shown in (b) the changed frequency layout diagram of Fig. 3 , The other base stations 31, 33, 34, 35, first, for each control f _1, f _3, f
_4, leaving f _1, reduce a call to the first frequency _{f 5, f 9, f 11} , f 5, 5 frequency f ₇ call frequency in the base station _{32, f 8, f 6,} f
_10, increased to f _12, 8 pieces of radio frequencies for calls f ₅ ~f ₁₂
Was being rearranged.

[0003]

Conventionally, as described above,
Since the allocation of the radio frequency for communication of each radio base station is fixedly allocated, when the traffic with a mobile station of a certain base station increases or when a new base station is added, all of the communication There was a problem that the arrangement of radio frequencies had to be reviewed from the beginning. An object of the present invention is to keep unchanged the arrangement of radio frequencies for communication which are already assigned to each base station when the traffic between a mobile station of an arbitrary base station increases or when a new base station is added. In order to provide a frequency allocation control method that can be dealt with according to the actual situation.

[0004]

The basic configuration of the present invention for achieving this object is shown in the principle diagram of FIG. Control between mobile unit 51 having a function as a telephone used by a subscriber of the system, a function for controlling connection with a radio base station and a function for transmitting and receiving radio frequency signals for communication, and control between mobile unit 51 It has the function of transmitting and receiving radio frequency signals that are call signals for calls and the function of the interface with the exchange that exchanges call signals with external wired general telephones. In a mobile communication system including a plurality of wireless base stations 31 to 35 that convert to a wired system and relay, and a switching center 11 that controls the plurality of wireless base stations and exchanges call signals, a call to all conventional base stations Radio frequency signal f ₅ required for interference and interference power ratio CIR of the radio frequency signal f ₅ for communication, which is allocated as the traffic between the mobile station 52 of the arbitrary base station 32 and the setting and setting process of the radio frequency for communication is set. The service of each base station In addition to the conventional algorithm that calculates the area (radius) as a constant, the base station such as transmission output, antenna directivity tilt angle, antenna height, etc., remains assigned to all base stations as radio frequencies for communication. By adding an algorithm (control) that changes only the device parameters of the above, and changing the service area of a certain base station 35 and its adjacent base stations 33, 34, the radio frequency for communication of the arbitrary base station 32 The CIR of the signal f ₅ is easily ensured so that the traffic to and from the mobile device 52 can be increased or decreased.

[0005]

In the present invention, the algorithm (control) for changing the device parameters of the base station such as the new transmission output, the antenna directivity tilt angle, the antenna height, etc. By being added to the algorithm for calculating the required CIR of the radio frequency signal f ₅ for a call which is allocated as the traffic between the mobile station 52 of the radio base station 32 and the arrangement and its setting process is increased or decreased. , In addition to automatically determining the frequency allocation for the call of each base station with respect to the increase or decrease of the traffic of the mobile device 52 of the conventional arbitrary base station 32, the fixed frequency allocation for the call remains unchanged, By changing the service area for each mobile station of a certain base station 35 and adjacent base stations 33, 34,
It is not necessary to change the frequency arrangement for communication due to the increase of the wave of the unplanned base station 32. Further, when the increased base station 35 becomes a failure, the adjacent base stations 33, 34 change the device parameters of the present invention to expand the service area and expand the service area of the failed base station 35. It is also possible to cover

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The principle diagram of FIG. 1 shows the configuration of the frequency allocation control system of the embodiment of the present invention as it is, and FIG. 2 shows a schematic sequence of the conventional operation for explaining the operation thereof. In the configuration shown in FIG. 1, the base stations 31 to 35 have their own service area 41 to
The size of 45 and the call frequency f ₅ assigned by the exchange 11
The control channels f _{1 to} f ₄ for transmitting the signal to each of the mobile units 51 and 52 are individually assigned. Then, as shown in the schematic sequence of FIG. 2, when there is a call request from the mobile station 52 in the service area 42 of the base station 32, the base station 32 switches the exchange station.
The call processor 13 of 11 is notified of a request for allocation of a frequency for communication using the control channel f ₂ . The call processing device 13 receives the request, and uses the database 21 of the switching device 12 to select one of all the radio frequencies (for example, eight radio frequencies f _{5 to} f ₁₂ ) for the call. Determines the radio frequency f ₅ for a call to be assigned to the mobile device 52 from. The switching device 12 notifies the call processing device 13 of the determined frequency f ₅ for communication to be allocated to the mobile device 52 through the control channel f ₂ , and the call processing device 13 notifies the base station 32 of the mobile device 52.
Use the communication frequency f ₅ for communication with 52. When the call between the mobile device 52 and the base station 32 is completed, the call processing device 13 notifies the switching device 12 of that fact, and the database 21
The frequency f ₅ for communication that was previously assigned to the mobile device 52 by
To cancel. When the traffic volume of the service area 42 of the base station 32 is increasing (that is, when many call frequencies are arranged), when the traffic volume of the service area 45 of the base station 35 is also increasing, Since there are few radio frequencies for calls to be allocated, the service area 45 of the base station 35 is reduced by changing the device output parameters such as the transmission output of the base station 35, the antenna directivity tilt angle, and the antenna height. By doing so, the traffic volume in the own service area 45 is forcibly reduced, and other base stations (for example, base station 3
2) To enable the radio frequency signal f ₅ for communication to secure the required CIR. By such a method, in the database 21 having all the radio frequencies for call that can be assigned, while keeping the radio frequencies f ₅ -f ₁₂ for calls requested and assigned from each base station constant, By reducing the service area 45, the traffic volume of the base station 32 can be increased.
Further, in order to prevent the occurrence of a dead zone of the mobile station near the boundary of the old service area 45 due to the reduction of the service area 45 of the base station 35, the base stations 33, 34 adjacent to the service area 45 of the base station 35 The size of each service area 43, 44 is simultaneously expanded by changing the device parameters.

[0007]

As described above, according to the present invention, the device parameters of a base station and an adjacent station are not relocated when the frequency of a certain base station is increased or increased without rearranging the frequency for communication. Since it can be dealt with only by changing, it is possible to reduce the number of man-hours for studying frequency allocation. Further, there is an effect that the rearrangement of the radio frequency for communication of each base station can be executed simultaneously with the change of the service area of a certain base station.

[Brief description of drawings]

FIG. 1 is a principle diagram showing a basic configuration of a frequency allocation control system of the present invention.

FIG. 2 is a schematic sequence diagram of a conventional operation for explaining the operation of the present invention.

FIG. 3 is an explanatory diagram of a conventional frequency allocation method.

[Explanation of symbols]

f _{1 to} f ₄ are radio frequencies for control, f _{5 to} f ₁₂ are radio frequencies for communication, 11 is a switching center, 12 is a switching device, 13 is a call processing device,
21 is a database, 31 to 35 are base stations, 51 and 52 are mobile stations,
41 to 45 are service areas.

Claims (4)

[Claims] 1. A mobile unit (51) having a function for a subscriber of a system to use as a telephone and a function for controlling a radio frequency signal for connection with a radio base station and transmitting and receiving a radio frequency signal for a call,
It has a function of controlling with the mobile unit, transmitting and receiving a radio frequency signal which is a call signal of a telephone call, and a function of an interface with an exchange that exchanges the call signal with an external general-purpose telephone of a wired system. A plurality of wireless base stations (31 to 35) for converting and relaying signals from a system to a wireless system or from a wireless system to a wired system, and a switching center (11) for controlling the plurality of wireless base stations and exchanging calls.
And a plurality of base stations (31
~ 35) Arrangement of all radio frequencies for communication and its setting process, and the requirement of radio frequency signals for communication allocated as traffic between the mobile station (52) of any base station (32) increases or decreases. In a frequency allocation control method having an algorithm for calculating a CIR (desired wave power to interference power ratio) for each service area of each base station, the assigned radio frequency (f ₁ ) for a call is left unchanged and By changing only the device parameters of the base station (35) and the base stations (33, 34) adjacent to the base station to change the respective service areas, the arbitrary base station (32)
The frequency allocation control method characterized in that the CIR of the radio frequency signal (f ₅ ) for the call is secured to cope with the fluctuation of the traffic with the mobile device (52). 2. A base station (33,3) adjacent to the base station (35).
2. The frequency allocation control system according to claim 1, wherein the service area of 4) is changed by changing the transmission output of the base station. 3. A base station (33,3) adjacent to the base station (35).
2. The frequency allocation control method according to claim 1, wherein the service area of 4) is changed by changing the tilt angle of the directivity of the antenna of the base station. 4. A base station (33,3) adjacent to the base station (35).
2. The frequency allocation control method according to claim 1, wherein the service area of 4) is changed by changing the height of the antenna of the base station.