JP2002247049A - Radio communication control system and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and stably perform radio communication by setting the optimal radio communication system according to a radio state. SOLUTION: When power is supplied to a terminal 21, communication equipment 31 transmits data for confirmation to a base station 4 in a preset communication system. The base station 4 returns the data for confirmation to the communication equipment 31 again when the data for confirmation are received. The communication equipment 31 compares the retransmitted data for confirmation with the data for confirmation before transmission, confirms a noise level such as a signal level and indirect waves, selects and sets the communication system suitable for the radio state. For example, the communication system such as a CDMA system or an OFDM system is set when the radio state is not satisfactory and a simple communication system such as an FDMA system, a TDMA system or the like is set when the radio state is satisfactory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication technique, and more particularly, to a wireless LAN (Local Area Network).
The present invention relates to a technology that is effective when applied to optimization in wireless communication such as wireless communication.

[0002]

2. Description of the Related Art With the recent advancement of information technology, attention has been paid to wireless access in advanced factories aiming at unmanned operation, hospitals where the latest medical equipment is introduced, and the like.

[0003] For example, in a wireless LAN or the like that uses wireless communication without using a cable for a transmission path, ISM (Industrial, Science), which has relaxed restrictions on the Radio Law.
A radio frequency band of a specific and medical band is widely used.

According to the study by the present inventors, the wireless LAN uses the 2.4 GHz band of the ISM band, and uses a wide band modulation system, a so-called spread spectrum (SS) as a communication system.
CDMA (Code Division Multiple Access)
access) is approved by the Radio Law.

[0005]

However, it has been found by the present inventors that the following problems exist in the wireless communication technology such as the wireless LAN described above.

That is, with the spread of wireless LAN,
A communication radio wave output from a certain wireless LAN communication device is:
There is a possibility that serious noise will occur in other wireless LANs, causing a communication failure.

[0007] With the recent deterioration of the electromagnetic environment, the development of so-called electromagnetically shielded buildings that shield electromagnetically to shield unwanted electromagnetic waves from outside, and electromagnetic wave absorbing interiors that absorb unnecessary electromagnetic waves indoors, has been progressing. In.

When used in a building in which such an electromagnetic shielding technology is introduced, the electromagnetic environment becomes favorable,
There is a possibility that the communication system using the MA will be over-spec and the cost of the communication equipment will increase.

Further, the CDMA system has a problem that the communication speed is rather lowered in a building having a good electromagnetic environment in which the above-described electromagnetic shield technology is introduced because of the complicated transmission system.

An object of the present invention is to provide a radio communication control system and a radio communication control system capable of performing radio communication efficiently and stably by setting an optimum radio communication system according to a radio wave condition. .

[0011]

A communication control system according to the present invention is a system for transmitting and receiving data between arbitrary terminals by wireless communication. The communication control system transmits and receives confirmation radio waves and secures a communication line in a terminal in communication. It has a base station and communication control means for confirming the radio wave condition from the confirmation radio wave transmitted from the base station, setting an optimal communication method corresponding to the radio wave condition, and transmitting and receiving data according to the set communication method. And a terminal that has been set up.

Further, a wireless communication control system according to the present invention comprises:
The communication control means checks a radio wave condition by comparing a transmission / reception unit for transmitting / receiving arbitrary wireless data with a confirmation radio wave transmitted from the transmission / reception unit and a confirmation radio wave returned from the base station. A communication control unit that outputs a setting signal for selecting a method, and a signal modulation unit that modulates a communication method set in the communication control unit based on the setting signal output by the communication control unit. And

Further, in the wireless communication control system according to the present invention, the communication control unit checks a radio wave condition, outputs a radio wave setting signal for selecting an optimum radio wave output, and optimally adjusts a radio wave output of the transmitting / receiving unit. It is characterized by the following.

Further, the wireless communication control system according to the present invention
The communication system set by the communication control unit is a CDMA system,
OFDM (Orthogonal Frequency Division Multiple Access: Orthogon)
alFrequency Division Multi
iplex), FDMA (Frequency Division Multiple Access: F)
frequency Division Multipl
e Access) system or TDMA (Time Division Multiple Access: Time Division Multiple)
Access) method.

Further, the wireless communication control system of the present invention is a system for transmitting and receiving data between arbitrary terminals by wireless communication, and outputs a confirmation radio wave and a communication line of the terminal communicating in a specific area. And a communication radio wave control unit that, when receiving a confirmation radio wave output from the specific base station, restricts the radio wave output to a predetermined level or less, and accesses only the specific base station. And a terminal having the terminal.

Further, the wireless communication control system of the present invention comprises:
The specific base station monitors whether the radio wave output from the terminal is equal to or lower than a predetermined level, and rejects communication with the terminal when detecting a terminal whose radio wave output is higher than the predetermined level. A communication level control unit is provided.

Further, according to the radio communication control method of the present invention, the communication control unit transmits predetermined confirmation data to the base station, the base station sends back the received confirmation data, The control unit compares the confirmation data retransmitted from the base station with the confirmation data transmitted by the communication control unit, confirms the radio wave condition, and selects an optimal communication method. And a step of performing data transmission by the signal modulating unit by performing the modulation according to the communication method described above.

Further, according to the radio communication control method of the present invention, when a confirmation radio wave output from a specific base station is received, the communication radio wave control unit limits the radio wave output to a predetermined level or less. A wireless communication control method comprising:

Further, the radio communication control method according to the present invention is characterized in that, when the terminal whose radio wave output is higher than a preset level is confirmed, the specific base station rejects access to the terminal.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a configuration diagram of a wireless LAN system according to Embodiment 1 of the present invention, FIG. 2 is a block diagram of a communication device provided in the wireless LAN system of FIG. 1, and FIG. 3 is an operation flowchart in the wireless LAN system of FIG.

In the present embodiment, the wireless LAN system 1 is a system using a transmission path using radio waves.
It is assumed that the building is constructed in an electromagnetically shielded building or a building with an interior made of a radio wave absorbing material.

[0023] The wireless LAN system 1, as shown in FIG. 1, the terminal (radio communication control system) 2 ₁ to 2 _N, the communication device (communication control unit, a radio communication control system) 3 ₁
3 _N , a base station (radio communication control system) 4. Terminal 2 ₁ to 2 _N can be a personal computer,
A terminal such as a workstation or a PDA (Pe
rsonal Digital Assistant
s), etc., and mutually share resources such as files and printers.

Communication device 3₁~ 3_NIs terminal 2₁~ 2_NTo
Connected to the terminal 2 ₁~ 2_NSend and receive from
Data that is converted and transmitted by wireless data transmission
connect. The base station 4 is a communication device 3₁~ 3_NOriginated from
Terminal 2 that is transmitting or receiving₁~ 2
_NSecure a communication line in.

The communication devices 3 ₁ (to 3 _N ) have the configuration shown in FIG.
As shown in (1), a transmission / reception unit 5, a communication control unit 6, a modulation control unit (communication control unit) 7, and a signal modulation unit 8 are provided. The transmission / reception unit 5 performs transmission / reception of data by an arbitrary wireless data communication method.

The communication control unit 6 controls data communication such as setting and confirmation of a communication method and a communication output, and data transmission and reception. The modulation control section 7 detects the modulation scheme set by the communication control section 6 and controls the transmission data to be modulated to a certain frequency.

The signal modulator 8 modulates transmission data to a certain frequency under the control of the modulation controller 7 and outputs the modulated data.

Next, the operation of the wireless LAN system 1 according to the present embodiment will be described with reference to the flowcharts of FIGS. 1, 2 and 3.

[0029] Here, the terminal 2 _1, and is described by focusing on the communication signal device 3 _1.

[0030] First, when the power of the terminal 2 ₁ is turned on, the communication control unit 6 of the communication device 3 _1, a preset confirmation data, preset communication scheme, for example CDMA system base station and the like 4 (Step S10)
1).

[0031] Base station 4 receives the confirmation data and sends back the confirmation data to the communication apparatus 3 ₁ again (step S102). Confirmation data retransmitted to the communication apparatus 3 ₁ from the base station 4 is input to the communication control unit 6 via the transceiver unit 5.

The communication control unit 6 compares the retransmitted confirmation data with the confirmation data of the communication control unit 6 itself (step S103), and confirms the signal level and the noise level such as an indirect wave. Then, a setting signal corresponding to the radio wave condition and a radio wave setting signal are output.

In the process of step S103,
Checks whether the signal level of the retransmitted confirmation data is lower than a certain level, the noise level is higher than a certain level, and whether the phase of the radio wave can be easily distinguished from the confirmation data or noise. . When communication is not being performed, the communication system is rechecked for a certain period of time.

If there is a problem with at least one of the noise level and the phase of the radio wave (step S104), the CDMA system or OFD capable of performing stable communication even when the radio wave condition is not good.
A communication method such as the M method is set, and a setting signal is output (step S105).

If there is a problem with the signal level (step S106), the communication control unit 6 sets an optimal signal output level and outputs a radio wave setting signal (step S107).

In the processing of steps S105 and S107, the setting signal and the radio wave setting signal output from the communication control unit 6 are input to the modulation control unit 7. The modulation control unit 7 controls the signal modulation unit 8 based on the setting signal,
The signal modulation 8 transmits and receives data according to the communication method set by the setting signal and the radio wave setting signal (step S).
108).

Further, if there is no problem with the signal level, the noise level or the phase of the radio wave in the processing of steps S104 and S105, the radio wave output level is reduced and a simple communication system such as the FDMA system or the TDMA system is performed. (Step S
109).

Then, in the process of step S109, the setting signal output from the communication control unit 6 is input to the modulation control unit 7. The modulation control unit 7 controls the signal modulation unit 8 based on the setting signal, and transmits and receives data by communication in accordance with the setting result of the signal modulation 8 as in the process of step S106.

Thus, according to the first embodiment, the communication devices 3 _{1 to} 3 _N can easily set the optimum communication system and the output level in a short time according to the radio wave condition. It is possible to perform efficient and high-speed communication with little transmission loss and to reduce the power consumption of the wireless LAN system 1.

In the first embodiment, the case where the present invention is applied to a wireless LAN system has been described.
Alternatively, PHS (Personal Handy-ph
The present invention can be applied to various systems for transmitting and receiving data and the like between terminals using a transmission path by radio waves such as one system.

Further, in the first embodiment, a system constructed in an electromagnetically shielded building or a building provided with an interior made of a radio wave absorbing material has been described, but a building without such an electromagnetically shielded building has been described. A good wireless communication environment can also be realized by applying the present invention to a wireless communication system.

(Embodiment 2) FIG. 4 is a block diagram of a radio communication system according to Embodiment 2 of the present invention, and FIGS.
5 is an operation flowchart in the wireless communication system of FIG.

In the second embodiment, as shown in FIG. 4, the radio communication system 9 includes mobile phones (terminals, radio communication control systems) 10 ₁ to 10 _N , base stations (specific base stations,
Wireless communication control system) 11. Cellular phone 10 ₁ to 10 _N is a small and light portable telephone.

The mobile phone 10 ₁ (〜１０10 _N )
A communication control unit (communication radio wave control means) 12 is provided. The communication control unit 12 detects the confirmation radio wave output from the base station 11 and controls the level of the radio wave output of the mobile phone 10 ₁ (〜１０10 _N ).

The base station 11 is provided in a building B, and a mobile phone 10 ₁ (to ₁₎ used in the building is used.
0 _N ) is monitored and controlled. In this building B, mobile phones 10 ₁ (-10 to 10) such as hospitals and halls are used.
_N ) Public facilities that limit calls. Further, the base station 11 may be provided in a place other than the building B, and may be, for example, a public vehicle such as a train or a bus.

The base station 11 is provided with a communication level control unit 13, which checks the state of radio waves output from the mobile phones 10 ₁ (（10 _N ) in the building. The communication control of the mobile phone 10 ₁ (〜１０10 _N ) is performed.

An antenna 11a for external communication is connected to the base station 11. This antenna 11a
An access is made from a wireless communication network of a mobile communication company via a communication tower TT to a communication control station TC that controls incoming call information and the like.

The mobile phone 10 ₁ (〜１０10 _N ) is connected to the base station 1
In a building or the like where 1 is installed, access is possible only to the base station 11, and in other cases, the communication control station TC is directly accessed from the wireless communication network via the communication tower TT.

Next, the wireless communication system according to the second embodiment will be described.
Regarding the operation of the stem 9, FIGS.
This will be described with reference to a flowchart. Again, mobile phone
10 ₁The description will be made by focusing on.

First, the communication control unit 12 of the mobile phone 10 ₁
It is, when the power is put into the cellular phone 10 ₁ checks whether it has received a confirmation wave output from the base station 11 (step S201).

[0051] Upon receiving the confirmation radio waves, the communication control unit 12 is limited such that the radio wave output below a certain radio wave output from the cellular phone 10 ₁ itself (step S20
2).

Here, it is generally said that a portable telephone or the like affects medical electronic devices such as a cardiac pacemaker when approaching within about 20 cm. It is not expected to be. Further, it is said that there is almost no problem with the radio wave output of the PHS.

[0053] Therefore, in the process of step S203, the communication control unit 12 upon receipt of a confirmation radio waves, a radio wave output from the cellular phone 10 _1, for example, about 70m
It shall be limited to about W or less.

Further, the communication control section 12 controls the mobile phone 10 _1.
Is limited to about 70 mW or less, and direct communication with the communication tower TT provided outdoors is refused (step S203).

On the other hand, the communication level controller 13 of the base station 11
The radio waves output from the cellular phone 10 _1, to confirm whether or not (step S301), the direct communication tower TT access reaffirmed or less than about 70mW about the aforementioned (Step S302) .

In the process of step S301, when the radio wave output of the mobile phone 10 ₁ is larger than about 70 mW, the base station 11 communicates with the mobile phone 10 ₁ outputting the radio wave larger than about 70 mW. Is rejected (step S303).

[0057] Further, in the processing of step S302, when the portable telephone 10 ₁ is direct access communication tower TT, the communication level control unit 13 of the base station 11, and communication control station TC directions, stop communicating A command to output the command is output to forcibly stop the communication of the mobile phone directly accessing the communication tower TT (step S304).

Thus, in the second embodiment,
In the building B where the base station 11 is installed, the radio wave output of the mobile phones 10 ₁ to 10 _N is forcibly reduced to a certain level that does not cause malfunction of a medical device or the like. An environment where a mobile phone can be used can be realized.

The present invention is not limited to the above embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

[0060]

(1) According to the present invention, an optimum communication method can be easily set in a short time according to the radio wave condition at the time of communication, so that high speed communication can be performed efficiently and wireless communication can be performed efficiently. The power consumption of the communication control system can be reduced. (2) Further, according to the present invention, the radio wave output of the terminal is forcibly reduced to a certain level in the area of the specific base station, so that the wireless communication can be used safely in public facilities such as hospitals.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wireless LAN system according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a communication device provided in the wireless LAN system of FIG. 1;

FIG. 3 is an operation flowchart in the wireless LAN system of FIG. 1;

FIG. 4 is a configuration diagram of a wireless communication system according to a second embodiment of the present invention.

FIG. 5 is an operation flowchart in the wireless communication system of FIG. 4;

FIG. 5 is an operation flowchart in the wireless communication system following FIG. 4;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 wireless LAN system 2 _{1 to} 2 _N terminals (wireless communication control system) 3 _{1 to} 3 _N communication device (communication control means, wireless communication control system) 4 base station (wireless communication control system) 5 transmission / reception unit 6 communication control unit 7 Modulation control unit (communication control unit) 8 Signal modulation unit 9 Wireless communication system 10 ₁ to 10 _N Mobile phone (terminal, wireless communication control system) 11 Base station (specific base station, wireless communication control system) 11a Antenna 12 Communication control unit (Communication radio wave control means) 13 communication level control unit TT communication tower TC communication control station

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H04L 13/00 305C F term (Reference) 5K033 AA05 DA02 DA19 DB16 EA02 5K034 AA05 DD03 EE03 FF02 HH63 5K060 AA25 BB07 CC04 FF00 FF09 FF10 HH01 LL01 PP03 5K067 AA13 BB04 CC02 CC04 CC08 CC10 DD44 DD46 EE02 EE10 EE16 HH22

Claims (9)

[Claims] 1. A wireless communication control system for transmitting and receiving data between arbitrary terminals by wireless communication, comprising: a base station for transmitting and receiving a confirmation radio wave and securing a communication line for the terminal in communication; The terminal having communication control means for confirming the radio wave condition from the confirmation radio wave transmitted from the station, setting an optimal communication method corresponding to the radio wave condition, and transmitting and receiving data according to the set communication method. A wireless communication control system. 2. The wireless communication control system according to claim 1, wherein said communication control means includes: a transmitting / receiving unit for transmitting / receiving arbitrary wireless data; a confirmation data transmitted by said transmitting / receiving unit; Compare the radio wave for confirmation and check the radio wave condition,
A communication control unit that outputs a setting signal for selecting an optimal communication method; and a signal modulation unit that modulates the communication method set in the communication control unit based on the setting signal output by the communication control unit. A wireless communication control system. 3. The radio communication control system according to claim 2, wherein the communication control unit checks a radio wave condition, outputs a radio wave setting signal for selecting an optimum radio wave output, and optimizes a radio wave output of the transmitting / receiving unit. A wireless communication control system, characterized in that adjustment is made to 4. The wireless communication control system according to claim 2, wherein the communication system set by the communication control unit is a CDMA system,
A wireless communication control system, which is any one of an OFDM system, an FDMA system, and a TDMA system. 5. A wireless communication control system for transmitting and receiving data between arbitrary terminals by wireless communication, wherein the wireless communication control system outputs a confirmation radio wave and transmits / receives a confirmation signal within a specific area and under a specific situation. A specific base station that secures a communication line, and a communication radio wave that, when receiving a confirmation radio wave output from the specific base station, restricts radio wave output to a predetermined level or less and accesses only the specific base station. A wireless communication control system, comprising: the terminal having control means. 6. The radio communication control system according to claim 5, wherein the specific base station monitors whether a radio wave output from the terminal is equal to or lower than a predetermined level, and sets a radio wave output to a predetermined level. A wireless communication control system comprising: a communication level control unit that rejects communication with the terminal when the terminal that is larger than the terminal is detected. 7. A wireless communication control method for transmitting and receiving data between arbitrary terminals by wireless communication, wherein the communication control unit transmits predetermined confirmation data to the base station; Sending back the received confirmation data, and the communication control unit confirms the radio wave condition by comparing the confirmation data retransmitted from the base station with the confirmation data transmitted by the communication control unit, A wireless communication control method, comprising: selecting an optimum communication method; and performing a data transmission by a signal modulation unit performing modulation by the communication method selected by the communication control unit. 8. A wireless communication control method for transmitting and receiving data between arbitrary terminals by wireless communication, wherein a communication radio wave control unit controls radio wave output when receiving a confirmation radio wave output from a specific base station. A wireless communication control method, wherein the control is performed so as to limit the level to a predetermined level or less. 9. The wireless communication control method according to claim 8, wherein the specific base station rejects access to the terminal when the terminal confirms the terminal whose radio wave output is higher than a preset level. Characteristic wireless communication control method.