JP3237653B2 - Method for determining start-up sequence of base stations in PHS communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a function of connecting a plurality of base stations to a PHS switching apparatus, and synchronizing each of the plurality of base stations with a radio wave radiated and captured from another base station except itself. And a maintenance terminal or the PH
The present invention relates to a method for determining an activation order of base stations in a PHS communication system in which an S switching device is configured to maintain each of the base stations.

[0002]

In recent years, PHS (Personal Services)
Al Handyphone System) has been widely used. By the way, in a PHS communication system, when a plurality of base stations are densely installed, radio waves used by the respective base stations interfere with each other, causing various problems such as call disconnection, handover failure, and reception failure. There is a possibility that a serious failure may occur. Therefore, it is necessary to prevent the radio waves used by each base station from interfering,
One method for that is to establish air synchronization.

Here, the air synchronization will be briefly described with reference to FIG. In the PHS communication system, one frame is divided into eight radio slots, and each radio slot is used as a control slot or a communication slot. The control slot communicates information for controlling a call such as outgoing call, incoming call or handover, and communicates using radio waves of 1 to 2 frequencies, while the talk slot is used for transmitting voice and data. It communicates information by using radio waves of many frequencies.

In FIG. 9, the base station (A) to the base station (E) will be described as an example. The base station (A) uses a radio slot of a slot number 1 of a frame number 0 as a control slot. The base station (B) uses the radio slot of the slot number 2 of the frame number 1 as a control slot.
Also, the base station (C) has the slot number 4 of the frame number 0.
Is used as a control slot, and the base station (D) uses a radio slot of a slot number 4 of a frame number 1 as a control slot. Further, the base station (E) uses the radio slot of the slot number 3 of the frame number 2 as a control slot. In this way, each of the base stations (A) to (E) arranges the radio slots every 0.625 ms, and avoids the overlapping of the control slots in time, thereby establishing the air synchronization. ing.

By the way, it is possible to inexpensively realize such air synchronization by each base station capturing radio waves radiated by other base stations except itself. By the way, in this case, when establishing air synchronization, it is essential to start up the base stations in an accurate startup order. Hereinafter, a conventional method for determining the startup order of the base stations will be described.

[0006] Conventionally, a person in charge of deciding the startup sequence of base stations (eg, a system designer or a system administrator)
Recognizes the range of radio waves radiated from each base station,
In consideration of the positional relationship of all the base stations, an arbitrary base station among a plurality of base stations is determined as an absolute reference base station to be activated first (first), and then determined as an absolute reference base station. A base station capable of capturing radio waves radiated from the base station is determined as a second starting base station, and then,
Radio waves radiated from the base station whose start order has been determined are determined such that a base station capable of capturing radio waves radiated from the base station determined as the second start base station is determined as the third start base station. The start order of all the base stations is determined by sequentially determining the base station that can be captured as the base station to be started next.

However, according to this method, a person in charge of deciding the startup sequence (for example, a system designer or a system administrator)
Recognizes the range of radio waves radiated from each base station,
Since it is necessary to consider the positional relationship of all base stations, if the number of base stations is relatively few, such as several stations or tens of stations,
In this way, the operation of determining the activation order of the base stations in consideration of the positional relationship of all the base stations does not become a burden, but it is relatively difficult, for example, that there are hundreds or thousands of base stations. In many cases, the operation of determining the starting order of the base stations in consideration of the positional relationship of all the base stations in this way is very troublesome and burdensome.

[0008] Further, in the method of determining the starting order of the base stations in consideration of the positional relationship of all the base stations,
If the base station is relocated or a new base station is added and the positional relationship of the base stations is changed, in an extreme case, it is necessary to determine again the activation order of all the base stations. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has as its object to provide a base station capable of easily determining a start-up sequence of base stations on the assumption that air synchronization can be established between base stations. It is an object of the present invention to provide a method of determining the order of activating stations.

[0010]

According to the first aspect of the present invention, each base station first performs a field strength measurement process and radiates from other base stations except itself. And measure the electric field strength of the radio wave captured. Then P
The HS switching device or the maintenance terminal executes a measurement result collection process, and collects measurement results generated by each base station through the electric field strength measurement process. Then, the PHS exchange apparatus or the maintenance terminal executes a start-up order determination process, and based on the collected measurement results, allows each base station to capture radio waves radiated from other base stations except itself. The starting order of the base stations is automatically determined.

In other words, according to this method, the PHS exchange apparatus or the maintenance terminal allows each base station to radiate from other base stations except itself based on the electric field strength of the radio wave radiated and captured between the base stations. Automatically determine the startup order of each base station so that it can capture the radio waves that have been captured. At this time, each base station synchronizes with the radio waves radiated and captured from other base stations except itself. Therefore, unlike the conventional one, the person in charge of determining the activation order does not need to determine the activation order of the base stations in consideration of the positional relationship of all the base stations. The activation order of the base stations can be easily determined on the assumption that air synchronization can be established between them. Thereafter, by sequentially activating the base stations according to the activation sequence determined in this way, air synchronization can be established between the base stations.

According to the method for determining the activation sequence of the base station according to the second aspect, the PHS exchange apparatus or the maintenance terminal first executes the first process as the activation sequence determination process, and selects one of the plurality of base stations. An arbitrary base station is determined as an absolute reference base station to be activated first. Next, the PHS exchange apparatus or the maintenance terminal executes the second processing, and selects the absolute reference base station from the base stations whose activation order has not been determined based on the measurement result measured by the base station determined as the absolute reference base station. Among the radio waves captured by the base station determined as above, the base station that radiated the radio wave with the highest electric field strength is determined as the base station to be started next.

Next, the PHS exchange apparatus or the maintenance terminal executes a third process, and based on the measurement result measured by the base station determined as the base station to be activated next, among the base stations whose activation order has not been determined, From the radio waves captured by the base station determined as the base station to be activated next from the base station that radiated the radio wave with the highest electric field strength, the process of determining the base station to be activated next is the activation of all base stations. Repeat until the order is determined.

That is, according to this method, the PHS exchange apparatus or the maintenance terminal has the electric field strength of the radio wave captured by the base station determined as the absolute reference base station from the base stations whose activation order has not been determined. The base station that radiated the largest radio wave is determined as the base station to be activated next, and then the radio wave captured by the base station whose activation order has been determined as described above from among the base stations whose activation order has not been determined. Since the base station that radiates the radio wave with the highest electric field strength is determined as the base station to be started next, the starting order of the base stations can be automatically and sequentially determined for each station. Thereafter, by sequentially activating the base stations one by one in accordance with the activation order determined in this way, air synchronization can be established between the base stations.

According to the method for determining the activation order of the base station according to the third aspect, the PHS exchange apparatus or the maintenance terminal first executes the first processing as the activation order determination processing, and selects one of the plurality of base stations. An arbitrary base station is determined as an absolute reference base station to be activated first. Next, the PHS exchange apparatus or the maintenance terminal executes the second processing, and selects the absolute reference base station from the base stations whose activation order has not been determined based on the measurement result measured by the base station determined as the absolute reference base station. Next, start up a number of base stations including the base station that radiated the radio wave with the highest electric field strength, in addition to the base station that radiated the radio wave with the highest electric field strength among the radio waves captured by the base station determined as Is determined as a group of base stations to perform.

Next, the PHS exchange apparatus or the maintenance terminal executes a third process, and based on the measurement result measured by the base station determined as the base station group to be activated next, the activation order of the base station whose activation order has not been determined is determined. The base station that radiated the radio wave with the highest electric field strength among the radio waves captured by the base station determined as the base station group to be started next from all of the base stations is determined for all base stations. The process is repeated until the start order of the stations is determined.

That is, according to this method, the PHS exchange apparatus or the maintenance terminal has the electric field strength of the radio wave captured by the base station determined as the absolute reference base station from the base stations whose activation order has not been determined. In addition to the base station that radiated the largest radio wave, at least the electric field strength determines a number of base stations including the base station that radiated the next largest radio wave as the base station group to be started next, and then the start order is undecided. From among the base stations, the base station that radiated the radio wave with the highest electric field strength among the radio waves captured by the base station group whose startup order was determined as described above is determined as the base station group to be started next. Therefore, the activation order of the base stations can be automatically and sequentially determined for each of a large number of stations.

Thereafter, the base stations are sequentially activated for each of the multiple stations in accordance with the activation sequence determined in this manner, whereby air synchronization can be established between the base stations. Also, in this case, in the above-described second processing, by determining a number of base stations as a base station group to be started next, it becomes possible to start a number of base stations at the same time. Compared with the method described in claim 2, the time required to activate all base stations (total activation time) can be reduced.

According to a fourth aspect of the present invention, the PHS exchange apparatus or the maintenance terminal first executes the first process as the activation order determining process, and then executes the first process. A process is performed in which the boot order determined by the above method is used as the temporary boot order. Next, the PHS exchange apparatus or the maintenance terminal executes the second process, and determines that different radio slots of the frame are used as control slots when each base station starts up.

Next, the PHS exchange apparatus or the maintenance terminal executes a third process, and determines as the absolute reference base station among the base stations whose activation order has not been determined based on the measurement result measured by each base station. A number of base stations that have emitted radio waves captured by the base stations are determined as a group of base stations to be started next. Next, the PHS exchange device or the maintenance terminal
A fourth process is executed, and based on the measurement result measured by each base station, a radio wave captured by each base station determined as a base station group to be activated next among base stations whose activation order has not been determined is determined. The process of determining a number of radiated base stations as a group of base stations to be activated next is repeatedly executed until the activation order of all base stations is determined.

That is, according to this method, the PHS exchange apparatus or the maintenance terminal processes the activation order determined by the method described in claim 2 as a provisional activation order, and when each base station starts up, a frame is transmitted. It is determined that different radio slots are used as control slots. Next, the PHS exchange device or the maintenance terminal
From the base stations whose activation order has not been determined, a number of base stations that have emitted radio waves captured by the base station determined as the absolute reference base station are determined as a base station group to be activated next, and then the activation order is not determined. From among the determined base stations, a number of base stations that emitted radio waves captured by the base station group whose activation order was determined as described above will be determined as the base station group to be activated next, so In the same manner as in the method described in claim 3, the activation order of the base stations can be automatically and sequentially determined for each of a large number of stations.

Thereafter, the base stations are sequentially activated for each of a number of stations in accordance with the activation sequence determined in this manner, whereby air synchronization can be established between the base stations. Also, in this case, when each base station is activated, it is determined that different radio slots of the frame are used as control slots, so that all the radio waves captured by the base station group whose activation order is determined are radiated. Can be determined as a group of base stations to be started next, that is, a larger number of base stations can be started simultaneously, so that the method described in claim 2 or the method described in claim 3 can be performed. Compared with the method, the time required to start up all base stations can be significantly reduced.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. First, FIG.
1 schematically shows a configuration diagram of an HS communication system. FIG.
Private branch exchange (PBX: Private Branch eXcha
nge) 1 connects the PHS switching devices 2 to 6. P
The HS switching device 2 connects a base station (A) 7 and a base station (B) 8, and the PHS switching device 3 includes a base station (C) 9, a base station (B) 8.
(D) 10 is connected. Also, the PHS switching device 4
Base station (E) 11 and base station (F) 12 are connected, and PH
The S switching device 5 connects a base station (G) 13 and a base station (H) 14. Further, the PHS switching device 6 is connected to the base station (I)
15 are connected.

The maintenance terminal 16 is a LAN (Local Area Net)
work) 17, each of the PHS switching devices 2 to 6 is connected, and each of the base stations (A) 7 to
The base station (I) 15 can be maintained.

Here, each base station (A) 7 to base station (I) 15
Will be described. Each base station (A) 7 to base station (I)
When the power is turned on, the PHS switching device 15 performs a logical connection with each of the PHS switching devices 2 to 6 to which the PHS switching device is physically connected, and operates itself from the PHS switching devices 2 to 6. To obtain the necessary information for And each base station (A) 7
When the base station (I) 15 completes the logical connection, the base station (I) 15 captures the radio waves radiated by other base stations except for the base station, and determines the electric field strength of the captured radio waves and the usage status of the radio waves within a certain time. The base station of the PHS communication system to which the mobile station belongs is synchronized with the radio slot of the base station having the highest electric field strength and is searched for an unused radio slot (carrier sense). Radio waves are emitted using the wireless slot as a control slot.

Then, each base station (A) 7 to base station (I) 15
Is a frame or a radio slot used as a control slot as one of the information necessary for its own operation obtained from each of the above PHS switching devices 2 to 6, a base station used as a synchronization reference, and a base station used as a synchronization reference. When the relative frame, relative slot or relative time is designated, the designated frame, slot, base station or relative time is used with priority.

Each base station (A) 7 to base station (I) 15
Has a function of releasing a radio slot previously used as a control slot when receiving a radio control channel closing command from the maintenance terminal 16 during operation. When a radio control channel blocking release command is received from the maintenance terminal 16 while the channel is blocked, carrier sense is executed to determine a new radio slot to be used as a control slot, and the determined radio slot is used as a control slot. It has the function of radiating radio waves by using it.

Next, the operation of the above configuration will be described with reference to FIGS. First, each base station
(A) 7 to base station (I) 15 are activated according to an arbitrary activation order when the power is turned on, and emit radio waves (step S1).

Next, the maintenance terminal 16 checks all base stations.
(A) While the base station (I) 15 is emitting radio waves,
A radio control channel blocking command is transmitted to all base stations (A) 7 to base station (I) 15 in an arbitrary order for each base station, and then a radio control channel blocking release command is transmitted, or all Base station (A) 7 to base station (I) 1 in 15
The base station (A) 7 to the base station (I) 15 execute a carrier sense by transmitting a reboot command in an arbitrary order for each base station. In response, each of the base stations (A) 7 to (I) 15 measures the electric field strength of the radio wave radiated and captured from other base stations except itself (step S2, referred to in the present invention). Field strength measurement processing).

More specifically, the base station (A) 7 will be described as an example. The base stations (A) 7 to (C) 9 have a positional relationship as shown in FIG. If the station (A) 7 can capture the radio waves radiated by the other base station (B) 8 and the base station (C) 9, the base station (A) 7 becomes the other base station.
(B) 8. When radio waves radiated from the base station (C) 9 are captured, the electric field strength of each captured radio wave is measured. In FIG. 3, the reach of radio waves radiated by the base stations (A) 7 to (C) 9 is indicated by two-dot chain lines a to c, respectively.

Next, the maintenance terminal 16 checks each base station (A) 7
Transmit a measurement result report command to the base station (I) 15 and collect measurement results measured by all the base stations (A) 7 to base station (I) 15 (step S3, measurement result collection in the present invention). processing).

Next, the maintenance terminal 16 checks each base station (A) 7
Based on the measurement results collected from the base station (I) 15, each base station (A) 7 to each base station (I) 15
For those whose electric field strength of the radio wave captured by the base station (I) 15 satisfies a certain standard, an electric field strength table is created according to the electric field strength in descending order (step S4).

More specifically, taking the base station (A) 7 as an example, for example, the electric field strength of the radio wave radiated and captured from the base station (B) 8 is the highest, and then the base station (C) If the electric field strength of the radio wave radiated and captured from the next station 9 is the next largest, the maintenance terminal 16 transmits the base station (B) 8 and the base station
(C) Create an electric field strength table in the order of 9 (FIG. 4)
reference).

Then, the maintenance terminal 16 determines each of the base stations (A) 7 to 7 based on the electric field strength table thus created.
Determine the activation order of the base station (I) 15 (step S
5).

Here, there are three methods for the maintenance terminal 16 to determine the activation order of each of the base stations (A) 7 to (I) 15 based on the electric field strength table. (A) Method by starting each base station (A) Method by starting every two base stations (C) Method by starting every many base stations These three methods will be described later in detail.

The maintenance terminal 16 uses any one of these three methods to start the base stations (A) 7 to (I) 15 and to activate each base station (A) 7 to base station. Station
(I) Each base station (A) 7 to base station (I) for rewriting operation information used when 15 performs carrier sense
15 to the base station (A) 7 to
Rewrite the operation information of the base station (I) 15 (step S
6).

Next, the maintenance terminal 16 checks all base stations.
(A) The radio control channel closing command is transmitted to the base stations (I) 15 to 15 to block the radio control channels of all the base stations (A) 7 to (I) 15 (step S7). This allows
All the base stations (A) 7 to (I) 15 release the radio slots previously used as control slots.

Next, the maintenance terminal 16 sequentially transmits a radio control channel block release command to each of the base stations (A) 7 to (I) 15 based on the determined activation order, and the base station (A) 7
To sequentially release the blocking of the radio control channels of the base station (I) 15 (step S8). With this, each base station except for the base station determined as the absolute reference base station is started at least in a state where it can capture radio waves radiated from the base station started immediately before the base station. By using the filled wireless slot as the control slot, air synchronization can be established with reference to the base station determined as the absolute reference base station.

Next, the maintenance terminal 16 checks all base stations.
(A) After confirming that 7 to base station (I) 15 are activated,
It is confirmed whether or not each of the base stations (A) 7 to (I) 15 has established air synchronization (step S9). Here, when the maintenance terminal 16 detects a base station for which air synchronization has not been established, the maintenance terminal 16 transmits a radio control channel blocking command to all base stations for which air synchronization has not been established,
Step S among the base stations that have not established air synchronization
The wireless control channel blockage release commands are sequentially transmitted from the base stations having the smaller activation order determined in step 5, and the air synchronization is corrected.

As described above, the maintenance terminal 16
For each base station (A) 7 to base station (I) 15, each base station (A) 7
Create an electric field strength table indicating the magnitude relationship between the electric field strengths of the radio waves captured by the base station (I) 15 and, based on the electric field strength table, activate the base stations (A) 7 to the base station (I) 15 in order of activation. Is determined, and each base station is determined based on the determined activation order.
(A) 7 to base station (I) 15 are sequentially activated, and each base station (A) 7
Air synchronization is established between the base station (I) 15 and the base station (I) 15.

Now, each of the above-described base stations (A) 7 to
Three methods for determining the activation order of the base station (I) 15 will be sequentially described. Note that, in this case, the maintenance terminal 16 is
It is assumed that an electric field strength table as shown in FIG.

(A) Startup method for each base station First, a startup method for each base station will be described with reference to FIG. In addition, the method of starting each base station is as follows.
This is a method corresponding to claim 2 of the present invention. The maintenance terminal 16 determines the base station (A) 7 from among the base station (A) 7 to the base station (I) 15 as the absolute (first) reference base station to be activated first (first). (See attached section).

Next, the maintenance terminal 16 refers to the electric field strength table of the base station (A) 7 determined as the absolute reference base station to be activated first and refers to the base station (A) among the base stations whose activation order is not determined. ) Among the radio waves captured by 7, the base station that radiated the radio wave with the highest electric field strength is determined as the base station to be activated second. Here, since the base station (B) 8 satisfies the above condition, the base station (B) 8 is determined as the base station to be activated second (see the hatched portion in FIG. 5).

Next, the maintenance terminal 16 refers to the electric field strength table of the base station (B) 8 determined as the base station to be activated second, and selects the base station (B) from the base stations whose activation order is not determined. The base station that radiated the radio wave with the highest electric field strength among the radio waves captured by the radio communication device 8 is determined as the base station to be activated third. Here, among the radio waves captured by the base station (B) 8, the base station that radiated the radio wave with the highest electric field strength is the base station (A) 7, but the base station (A) 7 has already started up in the starting order. The base station (F) 12, which is the base station that has radiated the next largest electric field, satisfies the above conditions, so that the base station (F) 12 is activated as the third base station to be activated. It is determined (see the hatched portion in FIG. 5).

Next, the maintenance terminal 16 refers to the electric field strength table of the base station (F) 12 determined as the base station to be activated third, and selects the base station (F) from the base stations whose activation order is not determined. The base station that radiated the radio wave with the highest electric field strength among the radio waves captured by the radio communication unit 12 is determined as the fourth base station to be activated. Here, since the base station (I) 15 satisfies the above-described conditions, the base station (I) 15 is determined as the fourth base station to be activated (see the hatched portion in FIG. 5).

Thereafter, the maintenance terminal 16 determines the base station (H) 14 as the fifth base station to be activated according to the same procedure, and activates the base station (E) 11 sixth. Base station (D) 10 is determined as the seventh base station to be activated, and base station (G) 13 is determined as
The base station to be activated first is determined (see the hatched portions in FIG. 5).

Next, the maintenance terminal 16 refers to the electric field strength table of the base station (G) 13 determined as the base station to be activated eighth, and selects the base station (G) from the base stations whose activation order has not been determined. The base station that radiated the radio wave with the highest electric field strength among the radio waves captured by the radio communication device 13 is determined as the ninth base station to be activated. Here, the base stations that emitted the radio waves captured by the base station (G) 13 are the base station (E) 11 and the base station.
(D) 10 and these base station (E) 11 and base station (D) 1
Since the activation order has already been determined for 0, reference is made to the electric field strength table of the base station (D) 10 which is determined retroactively, that is, the base station (D) 10 determined to be the seventh to activate.

The maintenance terminal 16 radiates the radio waves captured by the base station (D) 10, the base stations (E) 11, the base station (G) 13, and the base station (B) 8; Station (E) 1
1, the base station (G) 13 and the base station (B) 8 have already determined the activation order.
That is, the base station determined as the base station to be activated sixth
(E) The eleven field strength table is referred to.

The maintenance terminal 16 radiates the radio waves captured by the base station (E) 11, and the base stations (D) 10, the base station (F) 12, the base station (H) 14, and the base station (G 13)
These base station (D) 10, base station (F) 12, base station (H) 1
4, since the activation order of the base station (G) 13 has already been determined, the electric field of the base station (H) 14 determined to be the fifth base station to be activated is traced back to the immediately preceding process, that is, Refer to the strength table.

The maintenance terminal 16 emits radio waves captured by the base station (H) 14, the base stations (I) 15, the base station (F) 12, and the base station (E) 11. Station (I)
15, the base station (F) 12 and the base station (E) 11 have already determined the activation order, so here again, the base station determined as the fourth base station to be activated goes back to the processing immediately before that, that is, the fourth activation base station. The station (I) 15 refers to the electric field strength table.

The maintenance terminal 16 radiates the radio waves captured by the base station (I) 15 to the base station (F) 12 and the base station (H) 14. Station (H)
Since the activation order has already been determined, reference is made to the electric field strength table of the base station (F) 12 which goes back to the process immediately before, that is, the base station (F) 12 which is determined as the third activation base station.

Since the maintenance terminal 16 is present in the base station (C) 9 as a base station whose activation order has not been determined, the maintenance terminal 16 determines the base station (C) 9 as the ninth base station to be activated. (See the hatched portion in FIG. 5).

As described above, the maintenance terminal 16 determines the base station (A) 7 as the base station to be activated first (first) and activates the base station secondly in the method based on the activation for each base station. The base station (B) 8 is determined as the base station, the base station (F) 12 is determined as the third base station to be activated, the base station (I) 15 is determined as the fourth base station to be activated, and so on. ,
Base station (H) 14, base station (E) 11, base station (D) 10, base station (G) 13, base station (C) 9, all base stations (A) 7 to base station ( I) Determine the 15 startup order.

In the above description, the base station (A)
7 corresponds to the first processing according to claim 2 of the present invention, and the base station determines the absolute reference base station to be activated first.
(B) The process of determining 8 as the base station to be activated second corresponds to the second process of claim 2 of the present invention, and the other base stations are respectively set as the base stations to be activated third to ninth. The processing to be determined corresponds to the third processing according to claim 2 of the present invention.

Here, in the case where such a method of starting each base station is adopted, all base stations (A) 7
Consider the total activation time required to activate the base station (I) 15. In this case, if the total activation time is T, the number of base stations is n, and the activation interval is t,

(Equation 1) Can be expressed as Therefore, for example, n = 20
Considering 0, for example, assuming that t = 18 seconds,
It can be calculated as T = 3600 seconds.

(A) Method based on activation every two base stations Next, a method based on activation every two base stations will be described with reference to FIG. In addition, the method by starting every two base stations is as follows.
A method according to claim 3 of the present invention, wherein each base station
(A) It is assumed that the maintenance terminal 16 can designate a wireless slot to be used as a control slot by the base station (I) 15 by using the slot numbers 1 to 4 in the frame.

In the same manner as the above-described method (A) in which the base station (A) is activated for each base station, the maintenance terminal 16 is configured to use the base station (A) 7 to the base station.
(I) The base station (A) 7 is determined as an absolute reference base station to be activated first (first) from 15 (see the hatched portion in FIG. 6).

Next, the maintenance terminal 16 refers to the electric field strength table of the base station (A) 7 determined as the absolute reference base station, and selects the base station (A) 7 from the base stations whose activation order is not determined.
The base station which radiated the radio wave with the highest electric field strength and the base station which radiated the radio wave with the next highest electric field strength among the radio waves captured by are determined as the base station group to be activated second. Here, the base station (B) 8 is the base station that radiated the radio wave with the highest electric field strength among the radio waves captured by the base station (A) 7, and the base station (C) 9 was the base station ( A) The base station that radiated the radio wave having the next highest electric field strength among the radio waves captured by 7, and these base stations (B) 8 and base station (C)
9 satisfies the above conditions, the base station (B) 8,
The base station (C) 9 is determined as the base station group to be activated second (see the hatched portions in FIG. 6).

Next, the maintenance terminal 16 refers to the electric field strength table of the base station (B) 8 determined as one of the base stations to be activated second, and selects one of the base stations whose activation order has not been determined. B) Among the radio waves captured by 8, the base station that radiated the radio wave with the highest electric field strength is determined as the third base station to be activated. Here, among the radio waves captured by the base station (B) 8, the base station that radiated the radio wave with the highest electric field strength is the base station (A) 7, but the base station (A) 7 has already started up in the starting order. The base station (F) 12, which is the base station that has radiated the next largest electric field, satisfies the above conditions, so that the base station (F) 12 is activated as the third base station to be activated. Determined (see the hatched portion in FIG. 6).

At the same time, the maintenance terminal 16 transmits the base station (C) determined as the other base station to be activated second.
Referring to the electric field strength table of FIG. 9, among the base stations whose activation order has not been determined, the base station that radiated the electric wave with the highest electric field strength among the radio waves captured by the base station (C) 9 is also the third. The base station to be started is determined. Here, the base station
(C) The base station that emitted the radio wave captured by 9 is the base station
(F) 12, base station (A) 7, and base station (B) 8. These base stations (F) 12, base station (A) 7, and base station (B) 8 have already determined the activation order. So, going back to the process just before,
That is, reference is made to the electric field strength table of the base station (A) 7 determined as the base station to be activated first (first).

The maintenance terminal 16 determines that the base station that has emitted the radio wave captured by the base station (A) 7 is the base station (B) 8,
Base station (C) 9; these base station (B) 8, base station (C)
Since the activation order has already been determined, it cannot be traced back to the immediately preceding process. Therefore, the electric field strength table of the base station (B) 8 determined as one of the base stations to be activated secondly is stored. refer.

Since the maintenance terminal 16 has the base station (D) 10 as the base station whose activation order has not been determined, the maintenance terminal 16 adds the base station (F) 12 to the base station (F) 12.
(D) 10 is also determined as the third base station to be activated (see the hatched portion in FIG. 6).

Next, the maintenance terminal 16 refers to the electric field strength table of the base station (F) 12 determined to be the third base station to be activated, and determines the base station (F) from among the base stations whose activation order is not determined. F) Among the radio waves captured by 12, the base station that radiated the radio wave with the highest electric field strength is determined as the fourth base station to be activated. Here, since the base station (I) 15 satisfies the above-described conditions, the base station (I) 15 is determined as the fourth base station to be activated (see the hatched portion in FIG. 6).

At the same time, the maintenance terminal 16 transmits the base station (D) determined as the other base station to be activated third.
Referring to the electric field strength table of FIG. 10, among the base stations whose activation order has not been determined, the base station which radiated the radio wave with the highest electric field strength among the radio waves captured by the base station (D) 10 is also identified as 4
The base station to be activated first is determined. Here, since the base station (E) 11 satisfies the above-described conditions, the base station (E) 11 is determined as the fourth base station to be activated in addition to the above-described base station (I) 15 ( In FIG. 6, refer to the hatched portions).

Next, the maintenance terminal 16 refers to the electric field strength table of the base station (I) 15 determined as the fourth base station to be activated, and selects the base station (I) from the base stations whose activation order is not determined. I) The base station that radiated the radio wave with the highest electric field strength among the radio waves captured by 15 is determined as the fifth base station to be activated. Here, since the base station (H) 14 satisfies the above conditions, the base station (H) 14 is determined as the fifth base station to be activated (see the hatched portion in FIG. 6).

At the same time, the maintenance terminal 16 transmits the base station (E) determined as the other base station to be activated fourth.
Referring to the electric field strength table of FIG. 11, among the base stations whose activation order has not been determined, the base station which radiated the radio wave with the highest electric field strength among the radio waves captured by the base station (E) 11 is also 5
The base station to be activated first is determined. Here, since the base station (G) 13 satisfies the above conditions, in addition to the above base station (H) 14, the base station (G) 13 is also determined as the fifth base station to be activated ( In FIG. 6, refer to the hatched portions).

As described above, the maintenance terminal 16 determines the base station (A) 7 as the first (first) base station to be activated first and activates the second base station second in the method based on the activation every two base stations. The base station (B) 8 and the base station (C) 9 are determined as the base station group, and the base station (F) 1 is set as the third activated base station group.
2. The base station (D) 10 is determined, and the base station (I) 15 and the base station (E) 11 are determined as the fourth base station group to be activated.
Base station (H) 14, the base station as the base station group to be activated first
(G) 13 is determined, and thus all base stations (A)
7 to the base station (I) 15 are determined in the activation order.

In the above description, the base station (A)
7 corresponds to the first process according to claim 3 of the present invention, and the base station determines the absolute reference base station to be activated first.
The process of determining (B) 8 and the base station (C) 9 as the absolute reference base station to be activated secondly corresponds to the second process of claim 3 of the present invention, and the other base stations are designated as 3 and 4, respectively. The process of determining the base station to be activated fifth to fifth corresponds to the third process of claim 3 of the present invention.

By the way, also in this case, when such a method of starting every two base stations is adopted, all base stations (A)
Consider the total activation time required to activate 7 to base station (I) 15. In this case, if the total activation time is T, the number of base stations is n, the activation interval is t, and the number of activation steps is s,

(Equation 2) Can be expressed as Therefore, also in this case, n
= 200, for example, assuming that t = 18 seconds, it can be calculated as T = 1800 seconds, and the total activation time T is shortened as compared with the above-mentioned (A) method in which each base station is activated. be able to.

By the way, the method described above is a method of deciding the activation order so that two base stations are activated at the same time. However, in one frame, four base stations are determined in each direction (downward and upward methods). , The activation order can be determined so that up to four base stations can be activated at the same time. In this case, the total activation time can be further reduced.

(C) Method based on activation for each of a number of base stations Next, a method based on activation for each of a number of base stations will be described with reference to FIGS. It should be noted that this method of starting up each base station is a method corresponding to claim 4 of the present invention, wherein each base station (A) 7 to base station (I) 15 is a base station designated by the maintenance terminal 16. Is a reference (relative reference base station) for establishing air synchronization, and a radio slot separated by a relative frame value or a relative slot value specified by the maintenance terminal 16 from a control slot used by the relative reference base station. It is assumed that radio waves can be radiated by using as a control slot.

The maintenance terminal 16 executes the above-described (A) method of starting each base station, and determines the base station determined thereby.
(A) 7, base station (B) 8, base station (F) 12, base station (I) 1
5, base station (H) 14, base station (E) 11, base station (D) 1
The order of 0, the base station (G) 13, and the base station (C) 9 is processed as the temporary activation order.

Then, as shown in FIG. 7, the maintenance terminal 16 determines that each of the base stations (A) 7 to (I) 15 uses a different radio slot of the frame as a control slot. That is, the maintenance terminal 16 is connected to the base station (A)
7 uses a radio slot of slot number 1 of frame number 0 as a control slot, base station (B) 8 uses a radio slot of slot number 1 of frame number 2 as a control slot, and base station (F) 12 The radio slot of slot number 1 of frame number 4 is used as a control slot,
.., (Omitted in the middle),..., The base station (G) 13 uses the slot number 1 of the frame number 14 as a control slot, and the base station (C) 9 uses the slot number 1 of the frame number 16. Is determined to be used as a control slot.

Next, the maintenance terminal 16 checks each base station (A) 7
~ With reference to the electric field strength table of the base station (I) 15, the base station (A) 7 which is determined as the first (first) absolute reference base station to be activated from among the base stations whose activation order has not been determined is captured. All the base stations that have emitted the radio waves are determined as the base station group to be activated second, and a relative frame value based on the base station (A) 7 is determined.

Here, the base station (B) 8 and the base station (C) 9 emit radio waves captured by the base station (A) 7, that is, the base station (B) 8 and the base station (C) ) 9 satisfies the above conditions, so base station (B) 8 and base station (C) 9 are determined as the base station groups to be activated second. And base station
(B) 8 uses, as a control slot, a radio slot of slot number 1 of frame number 2 which is a frame two frames after the frame to which the control slot of base station (A) 7 belongs, and uses base station (C) 9 Determines that the radio slot of slot number 1 of frame number 16, which is a frame 16 frames after the frame to which the control slot of base station (A) 7 belongs, is used as the control slot.

Next, the maintenance terminal 16 checks each base station (A) 7
To the base station (B) 8 and the base station (C) 9 which are determined as the base station group to be activated second among the base stations whose activation order has not been determined with reference to the electric field strength table of the base station (I) 15. All the base stations that radiated the radio waves captured by any of the above are determined as the third base station group to be activated, and the base station (B)
8 or the base station (C) 9 to determine a relative frame value.

Here, the base station (D) 10 is connected to the base station (B) 8
Radiates radio waves captured by the
(F) 12 radiates the radio waves captured by base station (B) 8 and base station (C) 9, that is, base station (D) 10 and base station (F) 12 satisfy the above conditions. Base station
(D) 10 and base station (F) 12 are determined as a base station group to be activated third. Then, the base station (D) 10 becomes the base station (B)
The base station (F) 12 uses the control slot of the base station (C) 9 as a control slot, using the radio slot of the slot number 1 of the frame number 12 which is a frame 10 frames after the frame to which the control slot 8 belongs. It is determined that the wireless slot with the slot number 1 of the frame number 4 which is the frame 12 frames before with respect to the frame to which the frame belongs belongs is used as the control slot.

Next, the maintenance terminal 16 checks each base station (A) 7
To the base station (D) 10 and the base station (F) 12 determined as the third base station group to be activated from among the base stations whose activation order has not been determined with reference to the electric field strength table of the base station (I) 15. All the base stations that radiated the radio waves captured by any of the base stations are determined as a base station group to be activated fourth, and the base station
(D) A relative frame value based on 10 or the base station (F) 12 is obtained.

Here, the base station (E) 11 is connected to the base station (D) 1
0, the base station (F) 12 emits radio waves captured by the base station (G) 13, the base station (G) 13 emits radio waves captured by the base station (D) 10, and the base station (H) 14 Base station (F) 12
The base station (I) 15 emits radio waves captured by the
Are radiating the radio waves captured by the base station (F) 12, that is, the base station (E) 11, the base station (G) 13, and the base station
Since (H) 14 and base station (I) 15 satisfy the above conditions, base station (E) 11, base station (G) 13, and base station (H)
14. The base station (I) 15 is determined as a base station group to be activated fourth.

Then, the base station (E) 11 becomes the base station (D) 10
The base station uses the wireless slot of slot number 1 of frame number 10, which is two frames before the frame to which the control slot of
(G) 13 uses the radio slot of slot number 1 of frame number 14 which is a frame two frames after the frame to which the control slot of base station (D) 10 belongs as a control slot, and uses base station (H) 14 Uses the radio slot of slot number 1 of frame number 8, which is a frame four frames after the frame to which the control slot of base station (F) 12 belongs as a control slot, and uses base station (I)
15 determines that the radio slot of slot number 1 of frame number 6, which is a frame after two frames based on the frame to which the control slot of the base station (F) 12 belongs, is used as a control slot.

As described above, the maintenance terminal 16 determines the base station (A) 7 as the absolute reference base station to be activated first (first) in the method based on the activation for each of many base stations,
The base station (A) 7 decides to use the radio slot of slot number 1 of an arbitrary frame decided as a control slot. Next, the maintenance terminal 16 determines the base station (B) 8 and the base station (C) 9 as a base station group to be activated second,
The base station (B) 8 uses the radio slot of slot number 1 of the frame two frames after the frame to which the control slot of the base station (A) 7 belongs as a control slot, and the base station (C) 9 (A) It is determined that the radio slot of slot number 1 of the frame 16 frames after the frame to which the control slot of 7 belongs is used as the control slot.

Next, the maintenance terminal 16 determines the base station (D) 10 and the base station (F) 12 as the third activated base station group, and the base station (D) 10 The base station (F) 12 uses the radio slot of slot number 1 of the frame 10 frames after the frame to which the control slot belongs as a control slot, and the base station (F) 12 uses the radio slot of the base station (C) 9 as a reference. It is determined that the wireless slot with the slot number 1 of the frame before the frame is used as the control slot.

Next, the maintenance terminal 16 determines the base station (E) 11, the base station (G) 13, the base station (H) 14, and the base station (I) 15 as the fourth base station group to be activated, Base station (E) 1
The base station (G) uses the radio slot of slot number 1 of the frame two frames before as the control slot with reference to the frame to which the control slot of the base station (D) 10 belongs.
13 is the slot number 1 of the frame two frames after the frame to which the control slot of the base station (D) 10 belongs.
Base station using the radio slot of
(H) 14 uses the radio slot of slot number 1 of the frame four frames after the frame to which the control slot of base station (F) 12 belongs as a control slot, and base station (I) 15 uses base station (F). ) It is determined that the radio slot of slot number 1 of the frame after two frames is used as the control slot with reference to the frame to which the 12 control slots belong, and thus all the base stations (A) 7 to base stations are used. (I) The starting order of 15 is determined.

In the above description, the process of setting the activation sequence determined by the method of activating each base station as the temporary activation sequence corresponds to the first process of claim 4 of the present invention. The process in which the stations (A) 7 to the base station (I) 15 determine to use different radio slots of a frame as control slots corresponds to the second process of claim 4 of the present invention. The process of determining B) 8 and the base station (C) 9 as the base station group to be activated secondly corresponds to the third process of claim 4 of the present invention, and the other base stations are designated as 3, 4 respectively. The process of determining the base station to be activated first corresponds to the fourth process of claim 4 of the present invention.

By the way, also in this case, when such a method of activating every base station is adopted, all base stations are activated.
(A) Consider the total activation time required to activate 7 to base station (I) 15. In this case, the total activation time is T, the number of base stations is n, the activation interval is t, the activation step number is s, and the base stations that emit radio waves that can be captured by each of the base stations (A) 7 to (I) 15 M is the average of the numbers of each base station (A) 7 to base station
(I) The degree of overlap of the radio wave range radiated by 15 is α (0 <
α <1) Assuming that the average value of the number of base stations that can be simultaneously activated next per one base station is M,

(Equation 3) Can be expressed as From this equation, the starting step number s is obtained as follows.

(Equation 4) From this equation, the total activation time T can be expressed as:

(Equation 5) Can be expressed as Therefore, also in this case, n
= 200, for example, t = 18 seconds, m = 5, α =
Assuming that it is 0.7, it can be calculated as T = 186.9 seconds. Compared with the above-described method (A) that is activated by each base station and (A) the method that is activated by every two base stations, The startup time T can be greatly reduced. That is, the (C) method based on the activation of each base station is larger as the number of base stations is larger than the other (A) method based on the activation per base station and (A) the method based on the activation per base station. ,
This has a great advantage that the total startup time T can be reduced.

As described above, according to the present embodiment, each base station
(A) An electric field strength table is created in descending order of electric field strength of radio waves captured for each of 7 to base station (I) 15 and each base station (A) 7 to base station (I) 15 is created based on the electric field strength table. The base station (A) 7 to the base station (I) 15 determine the activation order so that the base station can capture radio waves radiated from other base stations other than itself. (A) The activation order of each base station (A) 7 to base station (I) 15 can be easily determined on the assumption that air synchronization can be established between 7 to base station (I) 15.

As a method for determining the activation order of each base station (A) 7 to base station (I) 15, as described above,
Since any one of the method of (A) activation by each base station, (B) the method of activation by two base stations, and (C) the method of activation by many base stations is adopted, the scale of the PHS communication system is adopted. Depending on the type of use and the type of use, an appropriate method can be selected from these three methods to determine the activation order of the base stations.

Next, each will be described.
The method of starting each base station is as follows: each base station (A) 7 to base station
(I) Since each base station 15 arbitrarily determines the base station to be used as the relative reference, the base station started up immediately before due to a change in the wireless environment is compared with the case where steps S1 to S6 for determining the startup order are executed. Even if the radio wave emitted by the station cannot be accurately captured, air synchronization is established by capturing the radio wave radiated by another already activated base station and using that base station as a relative reference. Has the advantage that it is more likely to succeed.

Further, (A) the method based on activation at every two base stations is the same as (A) the method based upon activation at each base station, and each of the base stations (A) 7 to (I) 15 has a relative reference. Since the base station to be activated is determined arbitrarily, it is compared with the case where steps S1 to S6 for determining the activation order are executed,
Even if the radio wave radiated by the base station activated immediately before cannot be accurately captured due to a change in the wireless environment, the radio wave radiated by the other base stations that have already been activated is captured and the base station is compared with the base station. By using as a reference, there is an advantage that establishment of air synchronization is likely to be successful. Moreover,
(A) There is also an advantage that the total activation time required to activate all the base stations (A) 7 to (I) 15 can be shortened as compared with the method of activating each base station.

Further, the method of (C) activation by many base stations is different from the method of (A) activation by one base station and (B) the method of activation by two base stations.
7 to the base station (I) 15 has the advantage that the total start-up time required to start up can be greatly reduced. Furthermore, if it is possible to designate a plurality of base stations as relative reference base stations, even if radio waves emitted by one relative reference base station cannot be captured, other relative base base stations will radiate. There is an advantage that the possibility of successfully establishing the air synchronization can be increased by capturing the radio waves.

The processing in steps S1 to S6 for determining the activation order of each base station (A) 7 to base station (I) 15 is a PHS
It may be executed when a base station is relocated or newly installed in the communication system. When the system is started up as usual, steps S7 and subsequent steps may be executed.

The present invention is not limited to the above embodiment, but can be modified or expanded as follows. The PHS communication system may be any of a public system and a business office system. As shown in FIG.
A configuration in which each base station (A) 7 to base station (I) 15 is connected to a switch having the switching function of the S switching device, in other words, a switch configured by integrating a PHS switching device with a private branch exchange. It may be.

Not only is the maintenance terminal executing the processing of steps S1 to S9, but also the
The process of S9 may be executed. In all of the methods of (a) activation by one base station, (a) activation by two base stations, and (c) activation by many base stations, the base station (A) 7 is used as an absolute reference base station. The determination is not limited to this, and another base station may be determined as the absolute reference base station.

If a plurality of PHS communication systems coexist and the ranges of radio waves radiated by each base station overlap each other in the plurality of PHS communication systems, the absolute reference base station in one of the PHS communication systems may be used. The other PHS communication system may be configured to establish air synchronization on the basis of
Air synchronization may be established between the S communication systems.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an embodiment of the present invention.

FIG. 2 is a diagram schematically showing a system configuration;

FIG. 3 is a diagram showing the reach of radio waves emitted by each base station.

FIG. 4 is a diagram showing an electric field intensity table.

FIG. 5 is a diagram showing an activation order of base stations when a method based on activation for each base station is adopted.

FIG. 6 is a diagram corresponding to FIG. 5 in a case where a method of starting every two base stations is adopted

FIG. 7 is a diagram showing a provisional activation order;

FIG. 8 is a diagram showing an activation sequence of base stations in a case where a method of activating each base station is adopted.

FIG. 9 is a diagram schematically showing a state of air synchronization.

FIG. 10 is a diagram corresponding to FIG. 2;

[Explanation of symbols]

In the drawings, 2 to 6 are PHS switching devices, and 7 to 15 are base stations.
(A) to base station (I), 16 is a maintenance terminal.

Claims (4)

(57) [Claims] A plurality of base stations are connected to a PHS switching apparatus, and each of the plurality of base stations has a function of synchronizing with a radio wave radiated and captured from another base station except itself. In a method in which a PHS exchange device or a maintenance terminal determines a start-up sequence of base stations in a PHS communication system configured to maintain each of the base stations, the base stations are radiated from other base stations except for the base station. An electric field intensity measurement process for measuring the electric field intensity of the captured radio wave; a measurement result collection process for collecting the measurement results generated by the PHS switching device or the maintenance terminal by the electric field intensity measurement process by each of the base stations; Each base station can capture radio waves radiated from other base stations except itself based on the measurement results collected by the PHS switching device or the maintenance terminal. And a starting order determining process for automatically determining the starting order of each base station as described above. 2. The activation order determination process includes: a first process of determining an arbitrary base station from among the plurality of base stations as an absolute reference base station to be activated first; and determining the absolute reference base station. A base station that radiates a radio wave with the highest electric field strength among radio waves captured by the base station determined as the absolute reference base station from among base stations whose activation order has not been determined based on the measurement result measured by the base station. A second process to determine the base station to be activated next, and from the base station whose activation order has not been determined based on the measurement result measured by the base station determined as the base station to be activated next, The start order of all base stations determines the process of determining the base station that radiated the radio wave with the highest electric field strength among the radio waves captured by the base station determined as the base station to be started as the base station to be started next 3. The method according to claim 1, wherein the third process that is repeatedly executed until the start is performed is sequentially executed. 3. The base station determined as the absolute reference base station from the base stations whose activation order has not been determined based on the measurement result measured by the base station determined as the absolute reference base station. A base station group that starts up a number of base stations next including a base station that radiated a radio wave with the highest electric field strength in addition to a base station that radiated a radio wave with the highest electric field strength among radio waves captured by the station 3. The method according to claim 2, wherein the starting order of the base stations is determined in the PHS communication system. 4. The activation order determination processing includes: a first processing for processing the activation order determined by the method according to claim 2 as a provisional activation order; and a different radio of a frame when each of the base stations is activated. A second process of deciding to use a slot as a control slot, and a base station determined as the absolute reference base station from among base stations whose activation order has not been determined based on a measurement result measured by each of the base stations. A third process of determining a number of base stations that have emitted radio waves captured by the base station as a group of base stations to be activated next, and the activation order of base stations whose activation order has not been determined based on the measurement result measured by each base station. From among them, the process of deciding as a base station group to be started next a number of base stations that emitted radio waves captured by each base station decided as the base station group to be started next is performed for all Fourth processing and the boot order determination method of a base station in a PHS communication system according to claim 1, wherein the sequential execution to be executed repeatedly until the boot order of the earth station is determined.