JP2002291025A - Service area setting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a service area setting method for reducing a load required for the adjustment of an output level or reception sensitivity at installation of a base station and for reducing a time from system installation until start of operation so as to quickly start a service for users. SOLUTION: The service area setting method predetermines a mutual reception level range among base stations as a station replacement condition, sequentially selects one base station among the base stations as a transmission station, selects the other base stations for reception stations, revises the output level of the transmission station or the reception sensitivity of each reception station by sequentially selecting the transmission station and adjusts the reception level at the reception station to be in matching with the station replacement condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting a service area of a base station installed in a wireless communication system such as a PHS system, and more particularly to a method for adjusting an output level or a receiving sensitivity when the base station is installed. The present invention relates to a service area setting method capable of shortening the time from the installation of a system to the start of operation and enabling quick service start to a user.

[0002]

2. Description of the Related Art A service area setting method in a conventional PHS system will be described with reference to FIG. FIG. 13 is a conceptual explanatory diagram showing a service area of each base station in the PHS system. In the figure, the PHS base station is described as BS. As shown in FIG. 13, the service area of each base station includes a communication continuity range (area indicated by a dotted line in the figure) in which a communication state can be maintained in transmission and reception with the mobile station, and transmission and reception in the mobile station are possible. (In the figure, the area indicated by the solid line). The call continuity range requires that a signal transmitted from the base station be received at a reception level that is equal to or higher than a predetermined first predetermined value. It must be received at a reception level that is higher than a second specified value that is higher than the first specified value.

[0003] In the PHS system, when a service area is set, as shown in FIG. 13, a mobile station that is in a call is connected to an adjacent base station to continue the call by handover as the user moves. Although the areas where the stations can talk are overlapped, the overlapping part of the areas where calls can be made and received must not be too large in order to grasp the distant base station and not repeat the handover frequently. In order to satisfy the service area setting conditions as described above, the call continuable range and the callable / receivable range differ depending on the installation environment and the like of each base station. The overlapping conditions of the range where the call can be continued and the range where the call can be made and received are determined, and in order to set an appropriate service area that satisfies these conditions, the worker moves the entire planned service area and receives using the measuring instrument The electric field is measured, the measurement result is reported to an operator of an exchange control device (not shown) connected to each base station, and the operator of the exchange control device manually operates each base station based on the measurement result. Adjustment of output level or reception sensitivity was performed.

[0004] The factors that influence the service area include the output level and reception sensitivity of the base station, the height of the antenna, the antenna directivity, obstacles, reflection conditions, and restrictions on the installation location. The most influential ones are generally the power level and the reception sensitivity of the base station.

[0005] As a prior art of power adjustment in a base station, Japanese Patent Application Laid-Open No. 9-2198 published on August 19, 1997 is disclosed.
No. 83 “Mobile Communication System” (applicant: Toshiba Corporation, inventor: Keiichiro Karisyu et al.). This prior art,
When the center station cyclically collects the link busy and traffic volume at each base station and finds a base station whose link busy volume exceeds the threshold, it issues a transmission power reduction and carrier sense reduction command to all base stations, The base station that has received the command makes the attenuator attenuated, reduces the output level of the transmission signal, reduces the carrier sense, reduces the service area, and allows the base station to automatically use the communication channel of another base station. By avoiding the mistaken use of the communication channel of the station, interference between base stations can be avoided, and smooth communication can always be ensured by the mobile station.

[0006]

However, according to the conventional service area setting method, a wide range of measurement is performed manually and the output level or reception sensitivity of each base station is adjusted by manual operation of the switching control device. It takes effort,
There was a problem that costs such as labor costs were enormous. In addition, there is a problem that it takes a considerable time from the installation of the system to the start of operation, which is disadvantageous for the service user.

The present invention has been made in view of the above circumstances, and reduces the labor required for adjusting the output level or the receiving sensitivity when installing a base station, and shortens the time from the installation of the system to the start of operation. To provide a service area setting method capable of promptly starting a service to a user.

[0008]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems of the prior art is based on the premise that a mutual reception level range in a plurality of base stations is determined in advance as a station setting condition. In one, the base station is a transmitting station, the other base station is a receiving station, and the transmitting stations are sequentially switched to change the output level at the transmitting station or the receiving sensitivity at each receiving station,
As a service area setting method of adjusting the reception level at the receiving station to be the station setting condition stored,
It is possible to reduce the labor required for adjusting the output level or the receiving sensitivity when installing the base station, and to shorten the time from the installation of the system to the start of operation, thereby enabling quick service start to the user. .

[0009]

Embodiments of the present invention will be described with reference to the drawings. Note that the function realizing means described below may be any circuit or device as long as the function can be realized, and some or all of the functions may be realized by software. is there. Further, the function realizing means may be realized by a plurality of circuits, or the plurality of function realizing means may be realized by a single circuit.

In the service area setting method according to the present invention, a mutual reception level range in a plurality of base stations is determined in advance as station setting conditions, the transmission stations are sequentially switched to measure the reception level in each reception station, and the transmission level is measured. By changing the output level of the station or the receiving sensitivity of each receiving station, the receiving level at the receiving station is adjusted to be a station setting condition,
It is possible to reduce the labor required for adjusting the output level or the receiving sensitivity when installing the base station, and to shorten the time from the installation of the system to the start of operation, thereby enabling quick service start to the user. .

First, a schematic configuration of a mobile communication system for realizing the service area setting method of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram of a PHS system which is an example of a mobile communication system to which a service area setting method according to the present invention is applied. The PHS system according to the present embodiment for realizing the service area setting method of the present invention has a configuration shown in FIG.
As shown in FIG. 1, the communication system includes a plurality of base stations 1 for performing wireless communication with a mobile station (PS in the figure), and an exchange control device 2 connected to these base stations.

Each part of the PHS system according to the present embodiment will be described. The base station 1 has, in addition to the functions of a general base station, a function of measuring a reception level indicating the strength of a received signal at the time of signal reception and transmitting a measurement result to an exchange control device 2 described later; Follow the instructions from
The base station has a function of adjusting the output level at the time of signal transmission or the reception sensitivity at the time of signal reception, and details will be described later. In the present invention, in addition to the function as a general switching control device, the switching control device 2 stores a mutual reception level range in the plurality of base stations 1 as a station setting condition in advance as a service area setting function, A transmission or reception instruction is issued to each base station 1, and the transmission stations are sequentially switched so that the mutual reception levels between the base stations are measured. Is an exchange control device having a function of instructing an adjustment of an output level and instructing a receiving station to adjust a receiving sensitivity, which will be described later in detail.

Next, the base station 1 according to the embodiment of the present invention
Will be described with reference to FIG. FIG.
FIG. 3 is a configuration block diagram of a base station according to the embodiment of the present invention. The base station 1 according to the present invention, as shown in FIG.
0, an exchange control device interface 11, a codec unit 12, a baseband processing unit 13, and an IF unit 14.
, An RF unit 15 and an antenna 16.

Next, each unit of the base station 1 will be described.
The control unit 10 controls each component in the base station 1, transmits and receives radio signals to and from the mobile station as a general base station, and transmits and receives data to and from the switching control device 2. The setting operation on the transmitting side or the setting operation on the receiving side for setting the service area is performed in accordance with an instruction from the exchange control device 2. The operation on the transmitting side is performed by the exchange control device 2
Outputs an output level adjustment instruction to the RF unit 15 in accordance with the output level adjustment instruction from the control unit, and transmits a test signal for measuring a reception level using a control channel. 2 in accordance with the reception sensitivity adjustment instruction from the control unit 2, outputs a reception sensitivity adjustment instruction to the RF unit 15, receives a test signal for reception level measurement using a control channel, and exchanges the reception level measurement result at the time of reception. This is an operation of notifying the control device 2.

The exchange control unit interface 11 transmits and receives data to and from the exchange control unit 2. The codec unit 12 encodes / decodes the audio signal so that the control unit 10 can handle the audio signal as a digital signal. The baseband processing unit 13 performs channel coding / channel decoding such as data compression and error control. If the content to be transmitted / received is call voice, the received voice is received and channel-decoded. The signal is output to the codec unit 12, and the transmission voice signal transmitted from the codec unit 12 is channel-coded and output to the IF unit 14. On the other hand, when the content to be transmitted / received is other than voice such as an incoming / outgoing call, mail, etc., the received data is channel-decoded and output to the control unit 10, and the transmission data from the control unit 10 is channel-coded by IF Output to the unit 14. The IF unit 14
It modulates and demodulates transmitted and received wireless signals, and can also measure the reception level as a general function.

The RF unit 15 adjusts the output level of the transmission signal at the time of transmission and the reception sensitivity of the reception signal at the time of reception, and includes attenuators (ATT in the figure) 30 and 33, amplifiers 31 and 32, And a switch (SW in the figure) 34. The switch 34 is a switch for switching between transmission and reception of the antenna 16, and outputs a transmission signal output from the attenuator 30 and the amplifier 31 to the antenna antenna 16 at the time of transmission, and outputs a reception signal from the antenna 16 to the amplifier 32 and the attenuator 33 at the time of reception.
Output to the side. The attenuators 30 and 33 can control the attenuation rate according to an instruction from the control unit 10. By adjusting the attenuator 30, the output level as a base station can be reduced.
Can be adjusted to adjust the reception sensitivity as a base station. The antenna 16 transmits and receives a radio signal.

The operation of the base station 1 according to the present invention when setting a service area is as follows: when an instruction on the transmitting side from the switching control device 2 is received via the switching control device interface 11, the output level from the switching control device 2 is changed. Receiving instructions on
An output level adjustment instruction is output from the control unit 10 to the RF unit 15, the attenuator 30 is adjusted, a test signal for measuring the reception level is output from the control unit 10, and the IF unit 14
Is transmitted using the control channel via the RF unit 15 and the antenna 16. On the other hand, when an instruction on the receiving side from the exchange control device 2 is received via the exchange control device interface 11, an instruction regarding the reception sensitivity is received from the exchange control device 2, and the reception sensitivity is transmitted from the control unit 10 to the RF unit 15. Is output, the attenuator 33 is adjusted, a test signal for measuring the reception level is received via the antenna 16 and the RF unit 15 using the control channel, the reception level is measured by the IF unit 14, and the control is performed. The measurement result of the reception level is transmitted from the unit 10 to the exchange control device 2 via the exchange control device interface 11.

Next, an internal configuration of the exchange control device 2 according to the embodiment of the present invention will be described with reference to FIG. FIG. 3 is a configuration block diagram of the exchange control device according to the embodiment of the present invention. As shown in FIG. 3, the exchange control device 2 includes a control unit 20 and BS interfaces 21-1 to 21-2.
1-n, an exchange control unit 22, a maintenance console interface 23, and a maintenance console 24. The control unit 20 controls each component in the exchange control device 2, performs transmission / reception and exchange control of data with the base station 1 as a general control function, and in the present invention, performs control for setting a service area. Is what you do. The control for setting the service area means that the station setting condition indicating the mutual reception level range between the base stations is received and stored in advance from the maintenance console 24, and a transmission or reception instruction is issued to a plurality of base stations. The transmitting stations are sequentially switched to measure the mutual receiving level between the base stations, and the transmitting station is instructed to adjust the output level so that the receiving level at the receiving station becomes the station setting condition. This is for giving a sensitivity adjustment instruction. Details will be described later.

The BS interfaces 21-1 to 21-n
Transmits and receives data to and from the connected base stations. The switching control unit 22 manages the location registration information of the mobile station received via each base station, receives a call received from the source mobile station, and performs a call according to the location registration information of the destination mobile station. Also, it controls the transmission of a reception signal such as a voice received from the source mobile station from the nearest base station in accordance with the location registration information of the destination mobile station, and transmitting the signal to the destination mobile station. The maintenance console interface 23 includes a maintenance console 24.
It transmits and receives data to and from the server. The maintenance console 24 has a function of inputting data, and inputs station setting conditions indicating a mutual reception level range between base stations, a measurement schedule when performing mutual reception level measurement between base stations, and the like. Is what you do. Further, it has a function of displaying data received from the control unit 20, such as an output level or a result of adjustment of reception sensitivity.

Next, the control section 20 will be described in more detail. The control unit 20 includes an adjustment control unit 40 and a storage unit 50 as shown in FIG. 4 as characteristic portions for implementing the service area setting method according to the embodiment of the present invention.
have. FIG. 4 is a configuration block diagram of a characteristic portion in the control unit 20 of the exchange control device 2 for performing the service area setting method according to the embodiment of the present invention.
The adjustment control unit 40 includes a transmission / reception unit 41, an adjustment information setting unit 42, a reception level measurement unit 43, a transmission level adjustment unit 44, a reception sensitivity adjustment unit 45, and an adjustment result output unit 46. . The storage unit 50 includes a station setting condition storage unit 51, a measurement schedule storage unit 52, a measurement result storage unit 53, and an adjustment result storage unit 54.

First, each unit in the storage unit 50 will be described. The station setting condition storage unit 51 stores a mutual reception level range of a plurality of base stations as a station setting condition list, and stores condition data beforehand by the adjustment information setting means 42 described later before performing a service area setting operation. It is supposed to be. Here, a specific storage mode example and a storage example in the station setting condition storage unit 51 will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of a storage format of the station setting condition storage unit according to the present embodiment. For example, as shown in FIG. 5, the station setting condition storage unit 51 stores the base station number of the transmitting station, the base station number of the receiving station, the minimum reception level and the maximum reception level of the reception signal at the reception station, and the communication continuation level. The reception availability is stored in association with the reception availability. Specifically, the station setting conditions shown in FIG. 5 are as follows. When the first base station is a transmitting station, the second and third base stations must be able to receive a transmission wave from the transmitting station. Instead, the second base station is required to receive in a reception level range of at least 25 dBμV to a maximum of 50 dB. The fourth base station is required not to receive a transmission wave, and the maximum reception level is specified as 15 dBμV. It should be noted that whether or not the call continuation level in FIG.
V may be substituted.

The measurement schedule storage unit 52 stores how to switch between a transmitting station and a receiving station in a service area setting operation as a schedule list. Before performing the service area setting operation, an adjustment information setting operation described later is performed in advance. The means 42 stores the schedule data. Here, a specific storage mode example and a storage example in the measurement schedule storage unit 52 will be described with reference to FIG. FIG. 6 is a diagram illustrating an example of a storage format of the measurement schedule storage unit according to the present embodiment. The measurement schedule storage unit 52 sets, for example, a time phase t for managing the order in which each base station becomes a transmission station when measuring the reception level by sequentially switching the transmission stations. The corresponding transmission or reception distinction of each base station is stored. In FIG. 6, the transmission stations are arranged in ascending order from the base station having the base station number 1.

The measurement result storage unit 53 stores the measurement result of the reception level in each base station. For example, as shown in FIG. The transmitted data is stored. FIG. 7 is a diagram illustrating an example of a storage format of the measurement result storage unit according to the present embodiment.

The adjustment result storage unit 54 stores the adjustment results of the output level and the reception sensitivity in each base station.
For example, as illustrated in FIG. 8, a part that individually stores the result of adjusting the reception level of each receiving station to satisfy the station setting condition as “success” or “failure” corresponding to the time phase t, t
It has a part for storing the result of the adjustment as a whole as “success” or “failure”. FIG. 8 is a diagram illustrating an example of a storage format of the adjustment result storage unit according to the present embodiment.

Next, each unit in the adjustment control unit 40 will be described. The transmission / reception unit 41 transmits and receives data to and from a plurality of connected BS interfaces 21-1 to 21-n. The adjustment information setting unit 42 receives the station setting condition and the measurement schedule input from the maintenance console 24 via the maintenance console interface 23, and stores the station setting condition storage unit 51 and the measurement schedule storage unit 52.
Is to be stored.

The reception level measuring means 43 measures the reception level between the base stations in accordance with the measurement schedule stored in the measurement schedule storage section 52. Specifically, one of the plurality of base stations is used. Assuming that one base station is a transmitting station and the other base station is a receiving station, the receiving level at each receiving station is measured and stored in the measurement result storage unit 53 at the same time. Is to measure and store the data.

The operation of measuring and storing the reception level between the base stations in the reception level measuring means 43 will be described below in detail with reference to FIG. FIG. 9 is a flowchart showing the processing contents of the reception level measurement and storage in the reception level measurement means 43. In the process of measuring and storing the reception level in the reception level measuring means 43, first, as an initial state, an adjustment instruction is issued to all the base stations so that the output levels and the reception sensitivities of all the base stations become maximum (10).
0). Next, to initialize the time phase t, t = 1 is set (10
2) It is determined whether or not t is equal to or less than the number of base stations (BS) (104). If t is greater than the number of base stations (No), the process is terminated. If t is equal to or smaller than the number of base stations in the processing 104 (Yes), the base station serving as a transmitting station is instructed to transmit at a time phase t with reference to the measurement schedule storage unit 52 (106), and each of the receiving stations is received. To instruct the base station to measure the reception level (108), receive the reception level data transmitted from each reception station, store it in the measurement result storage unit 53 (110), and shift to the next phase. Is incremented by t (112), and the process returns to step 104. With the above processing, when the output levels and the reception sensitivities of all the base stations are at the maximum, the measurement of the reception levels with all the base stations as the transmission stations is completed, and the measurement results of the reception levels between the base stations are stored in the measurement results. It is stored in the unit 53.

The transmission level adjusting means 44 compares the station setting conditions stored in the station condition storage section 51 in advance with the reception level measurement results measured by the reception level measuring section 43 and stored in the measurement result storage section 53. However, if the reception level does not satisfy the station setting conditions, the base station, which is the transmitting station, is instructed to adjust the output level, and after the adjustment is completed, the transmitting station is instructed to transmit, and the receiving level is measured by each receiving station. An instruction is given, and the reception level of each receiving station is stored in the measurement result storage unit 53. The adjustment is repeated until the reception level satisfies the station setting condition, and the adjustment result is stored in the adjustment result storage unit 54.

Here, the operation of adjusting the output level of the transmitting station and measuring and storing the reception level in the transmission level adjusting means 44 will be described in detail with reference to FIG. FIG.
FIG. 4 is a flowchart illustrating processing contents of output level adjustment, reception level measurement, and storage in transmission level adjustment means 44. The processing in the transmission level adjusting means 44 is as follows. First, t = 1 is set to initialize the time phase t (200), and it is determined whether or not t is equal to or less than the number of base stations (BS) (202).
The process ends. If t is equal to or smaller than the number of base stations in the process 202 (Yes), the measurement result storage unit 53 is referred to,
It is determined whether or not the reception levels of all the receiving stations in the time phase t satisfy the station setting condition stored in the station condition storage unit 51 (204).
s), the overall adjustment result in the time phase t in the adjustment result storage unit 54 is stored as “success” (206), t is incremented to shift to the next time phase (208), and the process 202 is performed.
Return to

In the process 204, if the reception level of the receiving station at the time phase t does not satisfy the station setting condition (No), the measurement result of the receiving level that does not satisfy the station level is the maximum reception level of the station condition. It is determined whether the level is higher than the maximum reception level (210).
s) The transmitting station in the time phase t is detected with reference to the measurement schedule storage unit 52, and an instruction is given to this transmitting station to lower the output level by a predetermined width (220).

Subsequently, the transmission level adjusting means 44 instructs the transmission station to transmit (222), instructs each reception station to measure the reception level (224), and receives the reception level transmitted from each reception station. Receiving the data of the measurement result storage unit 5
3 and stored and updated in the location corresponding to the time phase t (22
6) Return to processing 204. When the measurement result is updated in the process 226, each reception level before the output level is reduced, which is already stored corresponding to the time phase t of the measurement result storage unit 53, is stored in the storage unit 50. After saving to another area, overwrite is performed. This is because each reception level before lowering the output level may be used in subsequent processing.

On the other hand, in the process 210, if the measurement result of the reception level that does not satisfy the station setting condition is not higher than the maximum reception level of the station setting condition (No), that is, the reception level of the reception level that does not satisfy the station setting condition is determined. If the measurement result is smaller than the minimum reception level, it means that the output level of the transmitting station has dropped too much, and it is necessary to cancel the last output level drop instruction (220). The transmitting station is instructed to increase the output level by a predetermined width (230), and the reception level stored in the measurement result storage unit 53 corresponding to the time phase t is increased. Since the result is a measurement result for the output level in the previous stage, in order to match the output level with the measurement result, the update saved in another area in the storage unit 50 in the process 226 is performed. At the previous reception level, the location corresponding to the time phase t in the measurement result storage unit 53 is overwritten (232), and no further output level adjustment is performed. Is stored (234), and t is incremented to shift to the next time phase (208), and the process 202 is executed.
Return to

In the above process, when the reception level is updated in the process 226, the reception level before update already stored in the measurement result storage unit 53 is saved in another area in the storage unit 50. After an output level increase instruction is sent to the transmitting station in step 230, the received level before update saved in step 232 is stored in the measurement result storage unit 53, so that the output level of the transmitting station and the measurement result storage are stored. Although the receiving level of the unit 53 can be matched,
In the process 226, the reception level before the update is not saved,
After instructing the transmitting station to increase the output level in process 230,
Instead of the process 232, a transmission instruction is again issued to the transmitting station, a reception level measurement instruction is issued to each receiving station, and the result of the re-measurement is stored in a location corresponding to the time phase t in the measurement result storage unit 53. It may be overwritten.

With the above processing, based on the output levels of all the base stations and the reception level at the maximum reception sensitivity stored in the measurement result storage unit 53 by the reception level measurement unit 43,
The reception level and the station setting conditions are compared for each time phase, and when all the reception levels satisfy the station setting conditions, or when the output level of the transmitting station is reduced from the maximum to the station reception conditions, Is satisfied, the phase t of the adjustment result storage unit 54 is
If the reception level falls below the minimum reception level of the station setting condition by lowering the output level of the transmitting station, the adjustment result of the entire phase t in the adjustment result storage unit 54 is stored as “successful adjustment = success”. It is remembered as a failure. In the processing of the transmission level adjusting unit 44, only the part of the adjustment result storage unit 54 that stores the adjustment result in the entire time phase t is used, so that the reception level of each receiving station satisfies the station setting condition. The part that individually stores the adjusted results is not used.

The reception sensitivity adjusting means 45 instructs the receiving station to adjust the receiving sensitivity if the reception level does not satisfy the station setting condition even after the transmission level adjusting means 44 adjusts the output level of the transmitting station. After the adjustment is completed, a transmission instruction is issued to the transmitting station, a measurement instruction of the reception level is issued to each reception station, and the reception level of each reception station is stored in the measurement result storage unit 53. The above adjustment is repeated until the reception level satisfies the station setting condition, and the adjustment result is stored in the adjustment result storage unit 54.
Is to be stored.

The operation of adjusting the receiving sensitivity of the receiving station and measuring and storing the receiving level in the receiving sensitivity adjusting means 45 will be described below in detail with reference to FIG. FIG. 11 is a flowchart showing the processing contents of reception sensitivity adjustment, reception level measurement and storage in the reception sensitivity adjustment means 45.
The processing in the reception sensitivity adjusting means 45 is as follows. First, t = 1 is set to initialize the time phase t (30
0), it is determined whether or not t is equal to or less than the number of base stations (BS) (302). If t is greater than the number of base stations (No), the process is terminated. If t is equal to or less than the number of base stations in the process 302 (Yes), it is determined whether or not the overall adjustment result in the time phase t = success is stored by referring to the adjustment result storage unit 54 (304). If it is stored as a success (Yes), t is incremented to shift to the next phase (308), and the process returns to the process 302.

On the other hand, in the process 304, if the entire adjustment result at the time phase t is not stored as success, that is, if the adjustment result is stored as failure (No), all the base stations at the time phase t are processed. In order to individually check whether the reception level satisfies the station setting condition, a variable b of the base station number is provided and initialized to b = 1 (310), and it is determined whether or not b is equal to or less than the number of base stations ( 312). Processing 31
In 2, if b is equal to or less than the number of base stations (Yes), it is determined whether the base station with the number b is a receiving station by referring to the measurement schedule storage unit 52 (314). No), that is, if it is the transmitting station, b is incremented to check the reception level of the next base station (338), and the process returns to the process 312 to perform the process related to the next base station number.

On the other hand, in the process 314, when the base station of the number b is the receiving station (Yes), the measurement result storage unit 53
It is determined whether or not the reception level of the base station with the number b satisfies the station setting condition (316). If the station setting condition is satisfied (Yes), the base station number b of the adjustment result storage unit 54 is determined. The adjustment result = success is stored in the item (318), and processing 338 is performed.
And increments b, and performs the process for the next base station number.

On the other hand, in step 316, if the reception level does not satisfy the station setting condition (No), it is determined whether or not the reception sensitivity of the base station of number b can be further reduced, that is, reception not satisfying the station setting condition. It is determined whether the level measurement result is higher than the maximum reception level under the station setting condition (32
0), when it is impossible to further reduce the reception sensitivity (No), the reception sensitivity adjustment unit 45 does not perform any further reception sensitivity adjustment, so the adjustment is made to the item of the base station number b in the adjustment result storage unit 54. Result = failure is memorized (32
4), skip to step 338, increment b, and perform the process for the next base station number.

On the other hand, in the process 320, if the reception sensitivity of the base station with the number b can be reduced (Ye
s) Instruct the base station of number b to lower the reception sensitivity by a predetermined width (330), measure the reception level again, receive the measurement result, and store the measurement result storage unit 53
(332), and returns to the process 316. Here, in the measurement of the reception level, a transmission instruction is given to the transmission station at the time t, a measurement instruction of the reception level is given to the base station with the number b, and the measurement result from the base station with the number b is obtained. Receiving,
This is a process of storing the measurement result in the location corresponding to the base station with the number b in the measurement result storage unit 53.

If b is larger than the number of base stations in the process 312 (No), the whole adjustment result in the time phase t of the adjustment result storage unit 54 is updated (340). This processing is performed by adjusting the reception sensitivity by the reception sensitivity adjustment unit 45 after the adjustment result of the entire time phase t has failed even if the output level is adjusted by the transmission level adjustment unit 44. If all the individual adjustment results of the receiving stations in the result storage unit 54 are successful, the adjustment result of the entire time t is stored as success. Then, in order to shift to the next time phase, t is incremented (30).
8) Return to the process 302.

According to the above processing, even if the output level is adjusted by the transmission level adjusting means 44, the overall adjustment result in the time phase t is unsuccessful. Is individually compared with the station setting conditions stored in the station setting condition storage unit 51, and when the reception level satisfies the station setting conditions, or in the process of decreasing the receiving sensitivity of the receiving station from the maximum. When the reception level satisfies the station setting condition, the adjustment result = success is stored in the item for storing the adjustment result of the corresponding reception station in the adjustment result storage unit 54, and it is impossible to further reduce the reception sensitivity of the reception station. When it becomes possible, the adjustment result = failure is stored in the item for storing the adjustment result of the corresponding receiving station in the adjustment result storage unit 54. Then, after the adjustment of the receiving sensitivity is completed for all the time phases t in which the adjustment result has failed after the adjustment in the transmission level adjusting unit 44, if the adjustment results for all the receiving stations are successful, the adjustment is performed. If the adjustment result of the entire phase t is stored in the result storage unit 54 as success = success, and if there is a receiving station whose individual adjustment result is unsuccessful, the adjustment result of the entire phase t in the adjustment result storage unit 54 is stored as failure. Will be done.

The adjustment result output means 46 is provided when the reception sensitivity adjustment by the reception sensitivity adjustment means 45 is completed.
4 is output to the maintenance console 24 via the maintenance console interface 23,
Is to be displayed.

The components of the adjustment control unit 40 have been described in detail above. Next, FIG. 12 shows a processing operation when the adjustment control unit 40 performs the service area setting method according to the embodiment of the present invention. I will explain using. Figure 1
FIG. 2 is a flowchart showing a process flow of a control unit of the exchange control device for realizing the service area setting method according to the embodiment of the present invention. First, the station setting condition and the measurement schedule are input from the maintenance console 24 by the operation of the adjustment information setting means 42 of the exchange control device 2, and the station setting condition storage unit 51 and the measurement schedule storage unit 52 are respectively entered.
(400) Note that the station setting conditions and the measurement schedule are, for example, immediately after the start-up processing of the exchange control device 2 or the like.
Before the service area setting of the base station is performed, the information is input in advance, and the station condition storage unit 51 and the measurement schedule storage unit 5
2 may be stored.

Next, the service area setting operation is started,
First, the receiving level measuring unit 43 issues an adjustment instruction to each base station so that the output levels and the receiving sensitivities of all the base stations become maximum (401). At this time, each base station instructed to adjust the output level and the receiving sensitivity is transmitted to the RF unit 15
By adjusting the attenuators 30 and 33 in the
Maximize output level and reception sensitivity. Subsequently, the reception level measurement unit 43 causes the measurement schedule storage unit 5
The transmission instruction is performed while sequentially switching the transmission stations in accordance with the measurement schedule stored in 2, the reception level measurement is instructed to each reception station, and the reception level measured by each base station is received and stored in the measurement result storage unit 53. (402).

Next, the transmission level adjusting means 44
As the transmission level adjustment processing, an output level reduction instruction and a transmission instruction to the transmitting station and a transmission instruction to the receiving station are performed so that the mutual reception level between the base stations satisfies the station setting condition stored in the station condition storage unit 51. Is repeatedly performed, and the result of the output level adjustment is stored in the adjustment result storage unit 54 (40).
5). Next, as the reception sensitivity adjustment processing by the reception sensitivity adjustment means 45, the reception level of the receiving station is determined for the time phase in which the adjustment result of the entire time phase fails even if the output level is adjusted by the transmission level adjustment means 44. Are repeatedly performed so as to satisfy the station setting condition, the reception sensitivity lowering instruction to the receiving station, the transmission instruction to the transmitting station, the receiving level measurement instruction to the receiving station, and the storage of the reception level in the measurement result storage unit 53. Then, the result of the reception sensitivity adjustment is stored in the adjustment result storage unit 54 (40).
7). Finally, the adjustment result output means 46 outputs the adjustment result stored in the adjustment result storage unit 54 to the maintenance console 24 via the maintenance console interface 23 and displays the result (408).

In the reception sensitivity adjustment processing of the above-described processing 406, adjustment is performed sequentially for all time phases. However, the reception sensitivity is reduced so that the reception level of the receiving station satisfies the station setting condition in a specific time phase. If the previous phase adjustment result is affected, the processing of the reception level measurement and storage (402) and the processing of the output level adjustment and the reception level measurement and storage (404) are performed again after the processing 406. May go.

According to the service area setting method of the embodiment of the present invention, the mutual reception level range between the base stations is determined as the station setting condition, and the station setting condition is stored in the exchange control device 2 in advance, and In the initial state where the output level and the receiving sensitivity of the station are maximized, the receiving level measuring means 43 measures the mutual receiving level between the base stations and stores the measurement result storage unit 53.
If the reception level of the measurement result storage unit 53 does not satisfy the station setting condition, the transmission level adjustment unit 44 adjusts the reception level while lowering the output level of the transmission station. The receiving station that does not satisfy the station setting condition even by adjusting the output level of the adjusting means 44 is adjusted while lowering the receiving sensitivity, and the adjustment result output means 46 outputs the adjustment result to the maintenance console 24. A wide range of electric field measurements
It is not necessary to adjust the output level or the receiving sensitivity of each base station by manual operation of the exchange control device 2, and it is possible to greatly reduce the labor required for adjusting the output level or the receiving sensitivity when installing the base station, There is an effect that installation costs such as labor costs can be reduced.

The adjustment of the output level or the reception sensitivity is as follows.
Since the change is automatically performed in accordance with the measurement schedule stored in advance in the exchange control device 2, there is an effect that a human error at the time of adjustment can be eliminated. In addition, since the time from the installation of the system to the start of operation can be greatly reduced, there is an effect that the service can be promptly started for the user. Further, since the adjustment result is displayed on the maintenance console 24, by checking the display after the service area setting process, there is an effect that the adjustment result can be easily grasped.

[0050]

According to the present invention, the mutual reception level ranges of a plurality of base stations are determined in advance as station setting conditions, and one base station among a plurality of base stations is set as a transmitting station and another base station is set as a transmitting station. A service area setting in which the station is set as the receiving station, the transmitting station is sequentially switched, the output level at the transmitting station or the receiving sensitivity at each receiving station is changed, and the receiving level at the receiving station is adjusted to the station setting condition stored. Since this method is used, the labor required for adjusting the output level or receiving sensitivity when installing the base station can be reduced, so that installation costs such as labor costs can be significantly reduced, and from the installation of the system to the start of operation. This has the effect that the service can be promptly started for the user by shortening the time.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a PHS system as an example of a mobile communication system to which a service area setting method of the present invention is applied.

FIG. 2 is a configuration block diagram of a base station according to the embodiment of the present invention.

FIG. 3 is a configuration block diagram of an exchange control device according to an embodiment of the present invention.

FIG. 4 is a configuration block diagram of a characteristic portion in a control section of the exchange control device for implementing the service area setting method according to the embodiment of the present invention.

FIG. 5 is a diagram illustrating an example of a storage format of a station setting condition storage unit according to the present embodiment.

FIG. 6 is a diagram illustrating an example of a storage format of a measurement schedule storage unit according to the present embodiment.

FIG. 7 is a diagram illustrating an example of a storage format of a measurement result storage unit according to the present embodiment.

FIG. 8 is a diagram illustrating an example of a storage format of an adjustment result storage unit according to the present embodiment.

FIG. 9 is a flowchart showing the processing contents of reception level measurement and storage in the reception level measurement means.

FIG. 10 is a flowchart showing processing contents of output level adjustment, reception level measurement, and storage in the transmission level adjustment means.

FIG. 11 is a flowchart showing processing contents of reception sensitivity adjustment, reception level measurement, and storage in the reception sensitivity adjustment means.

FIG. 12 is a flowchart showing a process flow of a control unit of the exchange control device for realizing the service area setting method according to the embodiment of the present invention.

FIG. 13 is a conceptual explanatory diagram showing a service area of each base station in the PHS system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base station 2 ... Exchange control apparatus 10 ... Control part
11: exchange control device interface, 12: codec unit, 13: baseband processing unit, 14: IF
Unit, 15 RF unit, 16 antenna, 20 control unit, 21 BS interface, 22 exchange control unit, 23 maintenance console interface, 24
... Maintenance console, 30 ... Attenuator, 31 ... Amplifier, 32 ... Amplifier, 33 ... Attenuator, 34
... Switch, 40 ... Adjustment control unit, 41 ... Transceiving unit,
42 adjustment information setting means 43 reception level measurement means 44 transmission level adjustment means 45 reception sensitivity adjustment means 46 adjustment result output means 50 storage unit
51: Station condition storage unit, 52: Measurement schedule storage unit, 53: Measurement result storage unit, 54: Adjustment result storage unit

Claims (1)

[Claims] 1. A mutual reception level range in a plurality of base stations is determined in advance as station setting conditions, and one base station among the plurality of base stations is set as a transmitting station and another base station is set as a receiving station. Switching the transmitting stations in order, changing the output level at the transmitting station or the receiving sensitivity at each receiving station,
A service area setting method, wherein a reception level at a receiving station is adjusted to satisfy the stored station setting condition.