JP2000151467A - Radio frequency hopping communication method and radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always ensure a high communication efficiency while precluding the possibility of use of a same frequency at the same time by plural base stations. SOLUTION: An identical frequency hopping pattern is used for each of base stations 21-24. Furthermore, a frequency changeover timing of each of the base stations 21-24 is synchronized. Moreover, each cycle of the frequency hopping pattern is deviated among the base stations 21-24 so that plural base stations 21-24 do not use one frequency at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless LAN (Loca
l) The present invention relates to a radio frequency hopping communication technique used for an Area Network).

[0002]

2. Description of the Related Art In recent years, a radio frequency hopping communication system has been known as one type of method in which a plurality of base stations each perform data communication with one or more terminal stations connected to the base station by a wireless LAN. . In this radio frequency hopping communication system, a frequency hopping pattern in which a plurality of different frequencies are set cyclically is set in each base station. Each base station performs wireless communication with all terminal stations located in its own wireless zone while sequentially switching the use frequency in accordance with the frequency hopping pattern.

[0003] The frequency constituting the frequency hopping pattern is usually from 2473 MHz to 249 MHz.
A total of 23 kinds of frequencies f1 to f23 are used in units of 1 MHz in a frequency band up to 5 MHz. These 23 types of frequencies f1 to f23 are cyclically set to form one frequency hopping pattern.

Therefore, when a radio frequency hopping communication system is adopted in a radio communication system having a plurality of base stations as described above, conventionally, the frequency hopping patterns set for each base station are made different from each other.
The same frequency is prevented from being used at the same time by a plurality of base stations adjacent to the wireless zone.

[0005]

However, since the types of frequencies constituting the frequency hopping pattern are limited, even if the frequency hopping pattern is made different, it is possible to avoid the use of several frequencies overlappingly. Did not. In addition, each base station sequentially switches the use frequency based on the frequency hopping pattern set for itself, and the frequency switching timing is arbitrarily determined for each base station. For this reason, even if the frequency hopping patterns set in the respective base stations are different from each other, the same frequency may be used in adjacent wireless zones at the same time.

In such a case, if the frequency of communication within each wireless zone is high, the amount of communication traffic at that frequency increases instantaneously, and other stations emit radio waves of the used frequency even if they want to communicate. There has been a concern that the probability of being unable to communicate increases, the waiting time increases, and the communication efficiency decreases.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a radio frequency hopping communication method capable of ensuring high communication efficiency without any risk that a plurality of base stations use the same frequency at the same time. Another object of the present invention is to provide a radio communication system employing radio frequency hopping communication that can ensure high communication efficiency at all times without any risk that a plurality of base stations use the same frequency at the same time.

[0008]

According to a first aspect of the present invention, there is provided a wireless communication system in which a plurality of base stations perform wireless communication while sequentially switching use frequencies according to a frequency hopping pattern in which a plurality of different frequencies are cyclically set. In the frequency hopping communication method, while using the same frequency hopping pattern used by each base station, synchronization of frequency switching timing in each base station,
In addition, the frequency hopping pattern cycle is shifted for each base station so that a plurality of base stations do not use one frequency at the same time.

According to a second aspect of the present invention, there is provided a wireless communication system in which a plurality of base stations perform wireless communication while sequentially switching use frequencies according to a frequency hopping pattern in which a plurality of different frequencies are cyclically set. A storage unit for storing a common frequency hopping pattern for each base station, and wirelessly transmitting a station identification code set for each base station each time the used frequency is switched according to the frequency hopping pattern stored by the storage unit. Identification code transmitting means, identification code waiting means for setting any one of the frequencies constituting the frequency hopping pattern as a used frequency at the time of start-up, and waiting for a station identification code wirelessly transmitted from another base station; Receives station identification code wirelessly transmitted from another base station by means Then, based on the station identification code, when the own station uses the frequency when the station is waiting for the station identification code by the identification code waiting means, it is determined whether a plurality of base stations do not use the frequency at the same time. Means for starting a frequency hopping operation in the frequency hopping pattern stored by the storage means so as to use the frequency at the time of waiting for the station identification code by the identification code waiting means at the timing determined by the determination means. Are provided.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a wireless communication system adopting the wireless frequency hopping communication method of the present invention.
0, four base stations 21, 22, 23, and 24, and a plurality of (eight in this embodiment) terminal stations 31, 3
2, 33, 34, 35, 36, 37, and 38.
Then, the server computer 10 and each of the base stations 21 and
2, 23, and 24 are connected by a LAN cable 40. The first and second terminal stations 31 and 32 are located in the wireless zone 51 of the first base station 21, and the third and fourth terminals are located in the wireless zone 52 of the second base station 22. Station 3
3 and 34 are located in the wireless zone 53 of the third base station 23.
Fifth and sixth terminal stations 35 and 36 are located in
Seventh and eighth terminal stations 37 and 38 are located in the wireless zone 54 of the base station 24.

Although not shown, each terminal station 31-38
Is connected to a client computer such as a POS (Point Of Sales: point of sale information management) terminal or a personal computer. The server computer 10 has a function of wirelessly transmitting programs, data, and the like to client computers connected to the respective terminal stations 31 to 38 via the respective base stations 21 to 24, and a function of wirelessly transmitting from the respective terminal stations 31 to 38. It has a function of collecting processing data and the like in the client computer via each of the base stations 21 to 24 and the LAN cable 40.

FIG. 3 is a block diagram showing a main part of a hardware configuration of the base stations 21 to 24.
No. 4 has the same hardware configuration. That is, the base stations 21 to 24 are provided on the main boat 200 with the CPU (Central Processing Unit) 201 configuring the control unit main body,
A ROM (Read Only Memory) 20 storing program data and the like for the CPU 201 to control each unit.
2. A random access memory (RAM) 203 which forms various memories such as a memory for storing transmission / reception data, a clock circuit 204 for measuring date and time, a DMA (Direct Memory Ac)
cess) a controller 205, a communication controller 206 for controlling data communication with the server computer 10 connected via the LAN cable 4, a timer circuit 207 for measuring an arbitrary set time, an operation unit 208 provided with switches, etc. An input port 209 for receiving a signal from the operation unit 208, a display 210, an output port 211 for outputting a display signal to the display 210, an EPROM (Erasable)
Programmable Read Only Memory) 212, Serial I
/ O (Input / Output) 213 and the like. Then, the CPU 201, the ROM 202, the RAM 203,
Clock circuit 204, DMA controller 205, communication controller 206, timer circuit 207, input port 20
9, the output port 211, the EPROM 212 and the serial I / O 213 are electrically connected by a bus line 214.

A wireless control unit 215 is provided outside the main boat 200, and the wireless control unit 215 is connected to the bus line 214 and the serial I / O 2
13. An antenna 216 is connected to the wireless control unit 215. In addition, each terminal station 31-31
Also, the hardware configuration of the base station 38 basically matches the base station shown in FIG.

In the wireless communication system having such a configuration,
Each of the base stations 21 to 24 has its own wireless zone 51.
At least one or more terminal stations 31 located among
To 38 and wireless communication by the frequency hopping communication method. Here, the base stations 21 to 24 commonly use the frequency hopping pattern P shown in FIG. This frequency hopping pattern P is 2473 MHz
11 frequencies f2, f7, f12, f18, f21, f arbitrarily selected from a total of 23 types of frequencies f1 to f23 in 1 MHz units in a frequency band from to
4, f9, f14, f20, f6, and f11 are cyclically configured by assigning hopping orders T = 0 to 10 in that order.

[0015] Each of the base stations 21 to 24 transmits the data of the frequency hopping pattern P to the EPROM 2.
12 (storage means). In addition, the above-mentioned EPRO
In M212, in addition to the data of the frequency hopping pattern P, as shown in FIG.
And reference frequency rank data x.

The base station ID table 61 stores information for each base station 21.
The rank data and the own station flag data arbitrarily set for the base stations 21 to 24 are stored for each ID code as a station identification code assigned to the base stations 21 to 24 in advance. Here, the rank data is the base station 21
Are integer data from 1 to n corresponding to the number n (n = 4 in the present embodiment) of the base stations 21 to 2
4, different rank data is assigned to each one in advance. In the own station flag data, the one corresponding to the ID code assigned to the own station is "1", and the one corresponding to the ID code assigned to the other station is "0".

The reference frequency rank data x is data corresponding to any one of the hopping ranks T (0 to 10 in the present embodiment) of the frequency hopping pattern P, and corresponds to each base station 21 to 24. , Arbitrary rank data is set in advance.

Now, the operating base stations 21 to 24
Communicates with the terminal stations 31 to 38 in the own station wireless zones 51 to 54 while sequentially switching the use frequency at predetermined intervals of one frequency stay time set in advance in the timer circuit 207 in accordance with the frequency hopping pattern P stored in the EPROM 212. Hopping communication is performed. In this case,
Each of the base stations 21 to 24 synchronizes the frequency switching timing. As shown in FIG. 5, immediately after switching the frequency, a control signal S (hereinafter, referred to as start data) declaring the start of staying at the frequency is wirelessly transmitted. Control signal for declaring the end of stay (hereinafter referred to as end data) E
Is transmitted wirelessly. Here, the start data S and the end data E each include an ID code as a station identification code set in the own station, that is, an own station flag set to “1” in the base station ID table 61. The corresponding ID code is incorporated and wirelessly transmitted (identification code transmitting means).

The CPU 201 of each of the base stations 21 to 24
Is controlled by a program to start the start-up processing shown in the flowchart of FIG. 6 when the drive power is supplied by the power supply means (not shown) and started. First,
As ST (step) 1, the reference frequency order data x set in the EPROM 212 is read. Then, from the data of the frequency hopping pattern P set in the EPROM 212, the frequency fx whose hopping order T is x is read out and set as the operating frequency of the wireless control unit 215. In this state, it waits for start data S of frequency fx transmitted from another base station as ST2 and ST3. The standby time at this time is a time corresponding to one cycle of the frequency hopping pattern P (one frequency stay time × 11 in the present embodiment) (identification code standby means).

If the start data S of the frequency fx cannot be received even after the elapse of the standby time (S
(YES in T3), in step ST4, the frequency hopping communication is started from the frequency f2 in which the hopping order T is 0.

On the other hand, when the start data S of the frequency fx is received within the standby time (YES in ST2), ST
As 5, an ID code as a station identification code incorporated in the received start data S is obtained. Then, S
Base station I set in EPROM 212 as T6
The D table 61 is searched, and rank data a corresponding to the ID code acquired from the start data S and rank data b corresponding to the ID code of the own station, that is, corresponding to the own station flag set to “1” The rank data b to be read is read. Then, as ST7, these rank data a, b
Based on the above, the determination processing of the start order y specifically shown in FIG. 7 is executed (determination means).

First, in ST71, a rank difference c is calculated from the rank data a and the rank data b by the following equation (1). c = ba (1) Here, when the rank difference c is a positive value (ST7
(YES in 2), as ST73, a calculation value d is calculated from the rank difference c and the reference frequency rank data x by the following equation (2). d = x−c + 1 (2) Here, when the operation value d is 0 or more (ST74)
YES), the calculated value d is set to the starting order y as ST75.
Is determined.

On the other hand, if the calculated value d in ST73 is a negative value (NO in ST74), the number n of frequencies constituting the frequency hopping pattern P is calculated (step ST76). In the embodiment, the value (d + n) obtained by adding 9) is determined as the start order.

On the other hand, if the rank difference c in ST71 is a negative value (NO in ST72), then in ST77, the rank difference c and the number n of frequencies constituting the frequency hopping pattern P (this embodiment). In step 9), the calculation value d is calculated by the following equation (3). d = n + c (3) Further, the calculated value d, the number n of frequencies constituting the frequency hopping pattern P, and the reference frequency rank data x
From this, the start order y is calculated and determined by the following equation (4). y = n− (d−x) +1 (4) Returning to FIG.

If the start order y is determined by the start order determination process in ST7 in FIG.
Is a frequency fx transmitted from another base station as ST8.
Waits for end data E. In this case, as long as the system operates normally, the end data E of the frequency fx is transmitted from the base station which has transmitted the start data S of the frequency fx within one frequency standby time set in advance.
In response to the reception of the end data E of the frequency fx, the control unit 1 starts the frequency hopping communication from the frequency fy in which the hopping order T is the start order y in ST9 (control means).

In the radio communication system according to the present embodiment including the base stations 21 to 24 operating as described above, each of the base stations 21 to 24 includes its own radio zone 51, 52, 5.
Not only the radio waves transmitted from the terminal stations 31 to 38 located in the stations 3, 54, but also the radio zones 51, 52, 53,
Base stations 21 to 24 and terminal stations 31 to 3 located within 54
It is assumed that the radio wave transmitted from No. 8 can also be received.

The data of the frequency hopping pattern P shown in FIG. 2 is commonly set in each of the base stations 21 to 24. Also, rank data [1] is set for the first base station 21 to which the ID code [100] is assigned, and rank data is set for the second base station 22 to which the ID code [200] is assigned. Data [2] is set and ID code [300] is assigned to the third
It is assumed that rank data [3] is set for the base station 23, and rank data [4] is set for the fourth base station 24 to which the ID code [400] is assigned. It is also assumed that [3] is set as the reference frequency order data x in each of the base stations 21 to 24.

Assuming that the power of the first base station 21 is turned on in a state where the powers of all the base stations 21 to 24 are all turned off, the hopping order T
= Wait for start data S from another station at the third frequency f18. However, since the start data S of the frequency f18 cannot be received even after the time corresponding to one cycle of the frequency hopping pattern P has elapsed, the first base station 21, as shown in FIG. From time 0t, wireless communication is started at the frequency f2 of the hopping order T = 0. Then, every time one preset frequency standby time elapses (time points 1t, 2t, 3t,...), The use frequency is sequentially switched in the order of f7, f12, f18,. Then, one frequency standby time at the frequency f11 of the hopping order T = 10th elapses and the time t1
When it becomes 1, the frequency returns to the frequency f2 of the hopping order T = 0. Thus, the first base station 21 performs the radio frequency hopping communication while sequentially switching the use frequency at the timing shown in FIG.

Next, it is assumed that the power of the second base station 22 is turned on, for example, between the time points 0t and 1t. Then, the second base station 22 waits for start data S from another station at the frequency f18 of the hopping order T = 3rd. In this case, since the start data S of the frequency f18 is transmitted from the first base station 21 at the time 3t, the second base station 22 determines the ID code of the first base station 21 from the start data S [ 1
00]. Next, a rank code a = 1 corresponding to the ID code [100] of the first base station 21 and a rank code b = 2 of the own station are acquired from the base station ID table 61, and a start order y determination process is executed. . As a result, since the rank difference c = 1> 0, the operation value d = 3 ≧ 0 is calculated, and the start order y = 3 is determined. As a result, the second base station 22 receives the end data E of the frequency f18 from the first base station 21 at time 4t, as shown in FIG.
Thus, the wireless communication is started at the frequency f18 of the hopping order T = 3rd. Thereafter, the radio frequency hopping communication is performed while sequentially switching the use frequency according to the frequency hopping pattern P at the timing shown in FIG.

Therefore, as apparent from a comparison between FIG. 8 and FIG. 9, the frequency hopping pattern of the frequency hopping communication performed by the first base station 21 and the second base station 22
The frequency hopping pattern of the frequency hopping communication performed by is that although the order of the frequencies is the same, the used frequency is shifted by one frequency stay time,
The first base station 21 and the second base station 22 never use the same frequency at the same time.

Next, it is assumed that the power of the third base station 23 is turned on, for example, between the time points 1t and 2t. Then, the third base station 23 waits for start data S from another station at the frequency f18 of the hopping order T = 3rd. Also in this case, since the start data S of the frequency f18 is transmitted from the first base station 21 at the time 3t, the third base station 23 transmits the ID code [ 1
00]. Next, a rank code a = 1 corresponding to the ID code [100] of the first base station 21 and a rank code b = 3 of the own station are acquired from the base station ID table 61, and a start order y determination process is executed. . As a result, since the rank difference c = 2> 0, the operation value d = 2 ≧ 0 is calculated, and the start order y = 2 is determined. As a result, the third base station 23, as shown in FIG.
Time point 4 immediately after receiving end data E of frequency f18 from
From t, the wireless communication is started at the frequency f12 of the hopping order T = second. Thereafter, the radio frequency hopping communication is performed while sequentially switching the use frequency according to the frequency hopping pattern P at the timing shown in FIG.

Therefore, as is apparent from comparison of FIGS. 8, 9 and 10, the frequency hopping pattern of the frequency hopping communication performed by the first base station 21 and the frequency hopping communication performed by the second base station 22 Since the frequency hopping pattern of the frequency hopping pattern and the frequency hopping pattern of the frequency hopping communication performed by the third base station 23 have the same frequency order but become used frequencies, the cycles are shifted by one frequency stay time, respectively. The third to third base stations 21 to 23 never use the same frequency at the same time.

Next, it is assumed that the power of the fourth base station 24 is turned on, for example, between the time points 2t and 3t. Then, the fourth base station 24 waits for start data S from another station at the frequency f18 of the hopping order T = 3rd. Also in this case, since the start data S of the frequency f18 is transmitted from the first base station 21 at the time 3t, the fourth base station 24 determines the ID code of the first base station 21 from the start data S [ 1
00]. Next, a rank code a = 1 corresponding to the ID code [100] of the first base station 21 and a rank code b = 4 of the own station are acquired from the base station ID table 61, and a start order y determination process is executed. . As a result, since the rank difference c = 3> 0, the operation value d = 1 ≧ 0 is calculated, and the start order y = 1 is determined. As a result, the fourth base station 24, as shown in FIG.
Time point 4 immediately after receiving end data E of frequency f18 from
From t, wireless communication is started at the frequency f7 of the hopping order T = 1. Thereafter, the radio frequency hopping communication is performed while sequentially switching the use frequency according to the frequency hopping pattern P at the timing shown in FIG.

Therefore, FIGS. 8, 9, 10 and 1
As is clear from the comparison between the first base station 21 and the third base station 23, the frequency hopping pattern of the frequency hopping communication performed by the first base station 21, the frequency hopping pattern of the frequency hopping communication performed by the second base station 22, The frequency hopping pattern of the frequency hopping communication and the frequency hopping pattern of the frequency hopping communication at the fourth base station 24 have the same frequency order, but the used frequencies are shifted by one frequency stay time, respectively. First to fourth base stations 2
No one to 24 use the same frequency at the same time.

Note that even if the fourth base station 24 is separated from the first base station 21 and the fourth base station 24 cannot receive the start data S from the first base station 21,
Since the start data S of the frequency f18 is transmitted from the second base station 22 at time 4t, the fourth base station 24 determines the ID code [20] of the second base station 21 from the start data S.
0]. Next, a rank code a = 2 corresponding to the ID code [200] of the second base station 22 and a rank code b = 4 of the own station are acquired from the base station ID table 61, and a start order y determination process is executed. . As a result, since the rank difference c = 2> 0, the operation value d = 2 ≧ 0 is calculated, and the start order y = 2 is determined. As a result, the fourth base station 24 starts the hopping order T = second frequency f12 from time 5t immediately after receiving the end data E of the frequency f18 from the second base station 22, as shown in FIG. To start wireless communication. Thereafter, the radio frequency hopping communication is performed while sequentially switching the use frequency according to the frequency hopping pattern P at the timing shown in FIG. Therefore, also in this case, each of the base stations 21 to 24
Never use the same frequency at the same time.

In the fourth base station 24, 0 is set as the reference frequency order data x, and the first to third base station
While each of the base stations 21 to 23 is executing the frequency hopping communication at the timings of FIGS. 8 to 10, respectively,
It is assumed that the power of the fourth base station 24 is turned on between the time points 0t and 1t. Then, the fourth base station 24
Waits for start data S from another station at the frequency f2 of the hopping order T = 0. In this case, at time 1t in FIG.
, The start data S of the frequency f2 is transmitted from the second base station 22, so that the fourth base station 24 acquires the ID code [200] of the second base station 22 from the start data S. Next, a rank code a = 2 corresponding to the ID code [200] of the second base station 22 and a rank code b = 4 of the own station are acquired from the base station ID table 61, and a start order y determination process is executed. . As a result, rank difference c = 2>
Since it is 0, the operation value d = -1 <0 is calculated, and the start order y = 8 is determined. Thereby, the fourth base station 24
Starts wireless communication at the frequency f20 of the hopping order T = 8 from time 2t immediately after receiving the end data E of the frequency f2 from the second base station 22, as also shown in FIG. Thereafter, the radio frequency hopping communication is performed while sequentially switching the use frequency according to the frequency hopping pattern P at the timing shown in FIG.
Therefore, also in this case, the base stations 21 to 24 never use the same frequency at the same time.

In the first base station 21, 3 is set as the reference frequency order data x, and the second to fourth
While each of the base stations 22 to 24 is executing the frequency hopping communication at the timings of FIGS. 9 to 11, respectively,
It is assumed that the power of the first base station 21 is turned on between the time points 4t and 5t. Then, this first base station 24
It waits for start data S from another station at the frequency f18 of the hopping order T = 3rd. In this case, the start data S of the frequency f18 is transmitted from the third base station 23 at time 5t in FIG. 10, so that the first base station 21
, The ID code [300] of the third base station 23 is obtained. Next, a rank code a corresponding to the ID code [300] of the third base station 23 from the base station ID table 61.
= 3 and the own station's rank code b = 1, and executes a start order y determination process. As a result, the rank difference c = −2 <
Since it is 0, the operation value d = 7 is calculated, and the start order y =
6 is determined. As a result, the first base station 21 transmits the frequency f from the third base station 23 as shown in FIG.
At time 6t immediately after receiving the end data E of No. 18, wireless communication is started at the frequency f9 of the hopping order T = 6. Thereafter, the radio frequency hopping communication is performed while sequentially switching the use frequency according to the frequency hopping pattern P at the timing shown in FIG. Therefore, also in this case, the base stations 21 to 24 never use the same frequency at the same time.

As described above, in the present embodiment, a common frequency hopping pattern P is set for each of the base stations 21 to 24. Also, every time the used frequency is switched in accordance with the frequency hopping pattern P, an ID code as a station identification code assigned to each of the base stations 21 to 24 is wirelessly transmitted as start data. Further, at the time of start-up by turning on the power, any one of the frequencies constituting the frequency hopping pattern P is set as the used frequency, and the start data wirelessly transmitted from another base station is waited for. When the received station identification code is received, based on the station identification code, if the own station uses the frequency at which the station identification code is on standby, it determines whether the base station does not use the frequency at the same time. to decide. Then, at the determined timing, the frequency hopping operation in the frequency hopping pattern P is started so as to use the frequency at the time of waiting for the station identification code.

As a result, the frequency switching timing in each of the base stations 21 to 24 is synchronized, and the frequency hopping is performed for each of the base stations 21 to 24 so that a plurality of base stations 21 to 24 do not use one frequency simultaneously. Since the cycle of the pattern P is shifted by one frequency stay time, there is no possibility that the plurality of base stations 21 to 24 use the same frequency at the same time, and high communication efficiency can always be ensured.

In the above-described embodiment, the frequency hopping pattern P is a pattern composed of 11 types of frequencies. However, the number of types of frequencies constituting the frequency hopping pattern P is regulated unless the number of base stations is less than the number. Any number of frequency bands may be used.

In the embodiment, each base station 21
Rank data is set in addition to ID code in ~ 24,
The rank data can be omitted by using the rank data as an ID code.

[0042]

As described above in detail, the invention according to claim 1 of the present application makes the frequency hopping pattern used by each base station the same, synchronizes the frequency switching timing in each base station, In addition, there is provided a radio frequency hopping communication method in which a cycle of the frequency hopping pattern is shifted for each base station so that a plurality of base stations do not use one frequency simultaneously. By adopting this method, there is no possibility that a plurality of base stations use the same frequency at the same time, so that a remarkable effect that high communication efficiency can always be ensured can be achieved. In a wireless communication system including a plurality of base stations and a terminal station, the invention according to claim 2 of the present application provides a storage means for storing a common frequency hopping pattern in each base station, and a frequency stored by the storage means. An identification code transmitting means for wirelessly transmitting a station identification code set for each base station each time the used frequency is switched according to the hopping pattern, and setting any one of the frequencies constituting the frequency hopping pattern as the used frequency at startup Identification code waiting means for waiting for a station identification code wirelessly transmitted from another base station, and receiving a station identification code wirelessly transmitted from another base station by the waiting means, the base station based on the station identification code. Uses the frequency when the station is waiting for the station identification code by the identification code waiting means at any timing. If this is the case, a decision means for judging whether or not a plurality of base stations use the frequency at the same time, and the frequency at the time of waiting for the station identification code by the identification code waiting means at the timing determined by the decision means are used. And control means for starting a frequency hopping operation with the frequency hopping pattern stored by the storage means. With such a configuration, since there is no possibility that a plurality of base stations use the same frequency at the same time, it is possible to provide a wireless communication system that can always ensure high communication efficiency.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a configuration example of a frequency hopping pattern used in the embodiment.

FIG. 3 is a block diagram showing a main configuration of the base station according to the embodiment.

FIG. 4 is a view showing an example of main data stored in an EPROM of a base station in the embodiment.

FIG. 5 is a diagram showing timing of a control signal transmitted from a base station in the embodiment.

FIG. 6 is a flowchart showing a main part of a startup process executed by the CPU of the base station when the power is turned on in the embodiment.

FIG. 7 is a flowchart specifically showing the content of a start order y determination process in FIG. 6;

FIG. 8 is a diagram showing a change in frequency hopping of a first base station in the embodiment.

FIG. 9 is a diagram showing transition of frequency hopping of a second base station in the embodiment.

FIG. 10 is a diagram showing a change in frequency hopping of a third base station in the embodiment.

FIG. 11 is a diagram showing a change in frequency hopping of a fourth base station in the embodiment.

[Explanation of symbols]

 21 to 24 first to fourth base stations 31 to 38 first to eighth terminal stations 51 to 54 wireless zone 61 base station ID table P frequency hopping pattern

Claims (2)

[Claims] 1. A radio frequency hopping communication method in which a plurality of base stations perform radio communication while sequentially switching use frequencies in accordance with a frequency hopping pattern in which a plurality of different frequencies are set cyclically, a frequency used by each base station. The same hopping pattern is used, the frequency switching timing is synchronized in each base station, and the cycle of the frequency hopping pattern is set for each base station so that one frequency is not used by a plurality of base stations simultaneously. A radio frequency hopping communication method characterized in that it is shifted. 2. A wireless communication system in which a plurality of base stations perform wireless communication while sequentially switching use frequencies in accordance with a frequency hopping pattern in which a plurality of different frequencies are cyclically set, wherein each base station includes: Storage means for storing a common frequency hopping pattern, identification code transmission means for wirelessly transmitting a station identification code set for each base station each time the used frequency is switched according to the frequency hopping pattern stored by the storage means, ID code waiting means for setting any one of the frequencies constituting the frequency hopping pattern as a used frequency at the time of raising and waiting for a station identification code wirelessly transmitted from another base station; When receiving the station identification code wirelessly transmitted from the A determining means for determining at which timing the own station uses the frequency at which the identification code waiting means waits for the station identification code, the plurality of base stations do not use the frequency at the same time; and Control means for starting a frequency hopping operation with a frequency hopping pattern stored by the storage means so as to use a frequency when the station identification code is waiting by the identification code waiting means at a timing determined by the means. A wireless communication system characterized by: