JPH11313076A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system which prevents the degradation of communication capability in accordance with the change of a transmission/reception environment and which always can execute satisfactory transmission/reception. SOLUTION: An opposite terminal ID extraction circuit 6 detects ID data of an opposite terminal from a reception signal Fr and a reception level detector 5 detects/compares a reception level in an antenna 1a with a reception level in an antenna 1b arranged away from the antenna 1a. Address data of the antenna whose reception level is higher and ID data of the opposite terminal are stored in an antenna data memory 10. In transmission, a controller 12 reads an antenna address corresponding to transmission destination ID from the antenna data memory 10. A change-over switch 7 selects the antenna of the antenna address and data is transmitted. The antenna 1a or 1b is appropriately selected/used in accordance with a transmission/reception environment and data can always be transmitted in a maximum communication capability state corresponding to a communication environment in communication.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system in which a plurality of wireless communication terminals mutually transmit data via a wireless channel within a predetermined service area.

[0002]

2. Description of the Related Art A LAN (Local Area) having a service area of a radius of several tens to several hundreds of meters installed in the same building or premises of an office or office building, mainly for computer communication.
Network), coaxial cable as a transmission medium,
Twisted pair cables are installed in the service area. In this conventional LAN, there is a problem that if the layout is changed from the initial installation state, re-installation work requires a great deal of time and installation cost.

[0003]

In order to solve this problem, a wireless LAN has been used in which wiring work at the time of introduction is simple and layout after installation is easily performed. It is known that the communication capability of the wireless LAN greatly depends on the reception state of radio waves in a transmission / reception environment. In the current wireless LAN, for example, a room in which a wireless communication terminal is placed is redesigned, a large book shelf is placed near the wireless communication terminal, or a large number of people gather and have a meeting. Due to a change in the environment, the transmission / reception state may be deteriorated, the communication capability may be reduced, and normal communication may not be possible. In this case, when the antenna of the wireless communication terminal is moved, the transmission / reception state is improved, and normal communication may be possible.

[0004] The present invention has been made in view of the current state of operation of a wireless LAN as described above, and has as its object to prevent a decrease in communication capability in response to a change in a transmission / reception environment.
An object of the present invention is to provide a wireless communication system capable of always performing good transmission and reception.

[0005]

According to one aspect of the present invention, there is provided a wireless communication system in which a plurality of wireless communication terminals mutually transmit data via a wireless channel within a predetermined service area. A first antenna and a second antenna spaced from each other, ID detecting means for detecting ID data of a partner terminal from a received signal, a reception level of a received signal by the first antenna, Reception level detection means for detecting a reception level of the reception signal by the second antenna; address data of an antenna having a higher reception level detected by the reception level detection means; Antenna information storage means for storing ID data of the terminal in association with the terminal information; It reads the container address data, the read antenna address data of the antenna, is characterized in that it has a transmission control means for transmitting the transmission signal.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram showing the configuration of the present embodiment.

In this embodiment, as shown in FIG. 1, antennas 1a and 1b arranged at predetermined intervals are connected to switching terminals t1 and t2 of a switching stitch 7, respectively.
The input terminal of the wireless receiver 2 that receives the received signal and the output terminal of the wireless transmitter 3 that outputs the transmission signal are connected in parallel to the common terminal tc of the changeover switch 7. One output terminal is connected to a reception level detector 5 for detecting the level of a reception signal.
Is output from the received signal to the other output terminal
Is extracted. The other party terminal ID extracting circuit 6 for extracting the ID is connected. The output terminal of the reception level detector 5 is connected to the first input terminal of the antenna data memory 10 in which the data of the antenna is stored. It is connected to the second input terminal.

In this embodiment, a terminal 13 such as a personal computer for outputting a transmission signal is provided, and an output terminal of the terminal 13 is connected to a controller 12 for controlling transmission / reception and antenna switching. 12 is connected to the control terminal of the wireless receiver 2, the second control terminal of the controller 12 is connected to the third input terminal of the antenna data memory 10, and the third control terminal of the The control terminal determines the I of the destination terminal from the transmission signal.
It is connected to the input terminal of the destination terminal 1D extraction circuit 11 for detecting D.

Then, one output terminal of the destination terminal ID extraction circuit 11 is connected to the antenna data memory 10, and the other output terminal of the destination terminal ID extraction circuit 11 is
The input terminal of the wireless transmitter 3 is connected, the output terminal of the wireless transmitter 3 is connected to the common terminal tc of the changeover switch 7, and the switching signal output terminal of the antenna data memory 10 is connected to the drive terminal of the changeover switch 7. ing.

The operation of the present embodiment having such a configuration will be described. In the present embodiment, in the initial state, the changeover switch 7 is switched to the changeover terminal t1 side by a command from the controller 12, and
, The wireless receiver 2 monitors and detects the presence or absence of a carrier of a predetermined frequency in the received signal Fr from another wireless communication terminal except when the wireless transmitter 3 is transmitting.

In this state, the radio receiver 2
First, the reception signal Fr is received via the antenna 1a, the reception level detector 5 detects the reception level data fLa of the reception signal Fr, and at the same time,
The ID data fI of the partner terminal is detected by the D extraction circuit 6, and the reception level detector 5 detects the designated address of the antenna 1 a in the antenna data memory 10 in accordance with the ID data fI of the partner terminal. Is temporarily stored together with the received reception level data fLa. Then, the controller 1
2, the switching signal is input from the antenna memory 10 to the changeover switch 7, and the changeover switch 7 is connected to the terminal t2.
Side, the wireless receiver 2 receives the reception signal Fr via the antenna 1b, and the reception level detector 5 detects the reception level data fLb of the reception signal,
The reception level data fLb is already stored in the antenna memory 10
Is compared with the reception level data fLa temporarily stored in the storage device. If it is determined by this comparison that fLa> fLb, the specified address of the antenna 1a, which has been temporarily stored, is stored in the antenna memory 10 as it is in association with the ID data fI of the partner terminal. Also,
If it is determined that fLa <fLb, the antenna memory 10 stores the antenna 1a in place of the designated address of the antenna 1a.
The designated address b is updated and stored in association with the ID data fI of the partner terminal.

In this embodiment, while the reception of the reception signal from the partner terminal is continued, the reception level of the reception signal from the antenna 1a and the reception level of the reception signal from the antenna 1b are constantly compared and monitored. If necessary, the designated address of the antenna in the antenna data memory 10 is rewritten. When the reception of the reception signal Fr from the partner terminal is completed, the transmission mode is set by the controller 12, and the transmission data fs from the terminal device 13 is supplied to the transmission destination terminal ID extraction circuit 11 by the controller 12. The destination terminal ID data fsI is extracted from the transmission data fs by the destination terminal ID extraction circuit 11,
The data is input to the antenna data memory 10.

In this state, in the antenna data memory 10, the destination terminal ID from the destination terminal extracting circuit 11
The designated address of the antenna corresponding to the data fsI is read, and a switching signal corresponding to the designated address of the read antenna having a high reception level is input from the antenna data memory 10 to the changeover switch 7 to designate the antenna 1a. When a switch signal is input, the switch 7 is switched to the terminal t1. When a switch signal designating the antenna 1b is input, the switch 7 is switched to the terminal t2.

The transmission data fs is supplied to the radio transmitter 3, and the radio transmitter 3 forms a predetermined packet format for the transmission data fs supplied from the controller 12. This packet format includes a carrier reproduction bit string, a packet start flag,
Destination terminal address, sender address, type of bucket
A control method, a packet sequence number, transmission data, frame check data, and a packet end flag are formed into a packet of one frame. The transmission data configured in such a packet format is modulated, transmitted as a transmission signal Fs from the wireless transmitter 3 via the antenna 1a or the antenna 1b selected by the designated address, and adapted to the transmission / reception environment. Transmission and reception at the maximum communication capacity is performed. In this embodiment, the reception level is compared by two receptions. However, the present invention does not depend on the detection and comparison method of the reception level. The data may be reproduced after performing the switching and the level comparison to determine the receiving antenna.

For example, when a large number of partner wireless communication terminals are arranged, depending on the positions of the terminals, in the transmission and reception via the antenna 1a, the level of a received signal is remarkably reduced, and there is a terminal in which the communication performance is deteriorated. In the transmission and reception via the antenna 1b, the decrease in the level of the received signal may be reduced. In such a case, when transmitting to the corresponding partner terminal, the subsequent communication is performed with the antenna 1b selected. Is performed with the communication capability improved. In the present embodiment, in addition to this, in addition to the room remodeling, when the terminal is moving, when a large book shelf is newly arranged, the state of the interior of the room under construction, etc. , The antenna 1a,
Transmission and reception are performed with the communication capability improved by switching 1b.

As described above, according to the present embodiment, at the time of reception, reception level data fLa of reception signal Fr from the partner terminal via antenna 1a and reception level data fLb via antenna 1b are: Receive level detector 5
, And the ID data fI of the partner terminal is extracted by the partner terminal ID extraction circuit 6, and the designated address of the antenna with the higher reception level is associated with the ID data fI of the partner terminal and stored in the antenna data memory. 10 is stored. Then, at the time of transmission, the designated address of the antenna with the high reception level is read from the antenna data memory 10 in accordance with the partner terminal ID, the changeover switch 7 is switched to the selected antenna side, and the transmission by the selected antenna is performed. Is performed, it is possible to always perform transmission and reception with the maximum communication capacity according to the transmission and reception environment at that time.

[0017]

According to the present invention, a plurality of wireless communication terminals having a first antenna and a second antenna spaced apart from each other can communicate with each other via a wireless channel within a predetermined service area. Data transmission is performed. The ID data of the partner terminal is detected from the received signal by the ID detection means, and the reception level of the reception signal by the first antenna and the reception level of the reception signal by the second antenna are detected by the reception level detection means. The reception level is detected, and the address data of the antenna with the higher reception level detected by the reception level detection means and the ID of the other terminal detected by the ID detection means are detected.
D data are stored in the antenna information storage means in association with each other, and at the time of transmission, antenna address data corresponding to the destination ID is read from the antenna information storage means by the transmission control means, and the read antenna is read. Since the transmission signal is transmitted by the antenna of the address data, an antenna having a high communication level corresponding to the transmission / reception environment is appropriately selected and used from the first antenna and the second antenna, and the communication environment at the time of communication is always used. It is possible to perform data transmission in the maximum communication capacity state according to.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

[Explanation of symbols]

1a, 1b antenna, 2 radio receiver, 3 radio transmitter, 5 reception level detector, 6 partner terminal ID extraction circuit, 7 changeover switch, 10 antenna data memory,
11: destination terminal ID extraction circuit, 12: controller,
13 Terminals

Claims (1)

[Claims] 1. A wireless communication system in which a plurality of wireless communication terminals mutually transmit data via a wireless channel within a predetermined service area, wherein a first antenna and a second antenna are arranged at an interval from each other.
An antenna, ID detection means for detecting ID data of a partner terminal from a received signal, and detecting a reception level of the reception signal by the first antenna and a reception level of the reception signal by the second antenna Receiving level detecting means; and antenna information storing means for storing address data of an antenna having a higher receiving level detected by the receiving level detecting means and ID data of a partner terminal detected by the ID detecting means in association with each other. At the time of transmission, the destination ID from the antenna information storage means
And a transmission control means for transmitting a transmission signal using an antenna of the read antenna address data.