Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication device and a radio communication system, and more particularly, to a radio communication system in a system comprising a base station and a plurality of radios. The present invention relates to a wireless communication device and a wireless communication system that are used as digital cordless telephones and that improve the usability of communication between users. 2. Description of the Related Art The standards of digital cordless telephone systems are defined in the first edition of the second generation cordless telephone system standards issued on December 18, 1992 by the Radio System Development Center. According to this, the base station side radio apparatus has up to four simultaneous control channels and communication channels in a time-division manner, and constantly transmits control information to an area under control by the control channel. . When a call is made from a handset, the base station requests allocation of a communication channel through this control channel. The base station requested to be assigned notifies the available frequency and the time-division slot. The slave sets up a call with the base station using the assigned communication channel, and the base station notifies the other party of a call setting request through the exchange, and when the other party sets up the call, the two parties communicate with each other. Start.  When an incoming call is made to a slave unit, incoming call information is notified to the slave unit via a control channel. Therefore, the slave unit requests the assignment of a communication channel, and notifies the requested base station of the communicable frequency and the time-division slot. The slave sets up a call with the base station using the assigned communication channel, and starts a mutual call with the other party through the exchange. Here, the call setting between the base station and the slave unit is independent of each other, and the maximum simultaneous communication channel that the base station can simultaneously realize is three channels.  In the conventional digital cordless system, the call state of a plurality of slaves under the control of one base station, that is, the other slaves are in a standby state, a call is in progress, and a power supply is in progress. Information such as a stoppage could not be known from other slave units. Therefore, when a call is made from a certain handset, even if all the communication channels that can be controlled by the base station are used by other handset and calls cannot be made, the cause of the inability to make a call with that handset cannot be determined. However, there is a problem that the calling user needs to perform an unnecessary operation such as performing a calling operation until the user can make a call. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a base station and a plurality of slave units, which are mutually aware of a communication state between the slave units. It is an object of the present invention to provide a wireless communication device and a wireless communication system that are easy to use when performing communication between slave units by eliminating unnecessary operations when communicating between slave units. .  In order to achieve the above object, according to the present invention, there is provided a wireless communication apparatus comprising: a wireless communication apparatus wirelessly connected to a plurality of slave units; receiving the status information of the child device from the respective slave unit, reading and storing means for storing the state information of the received child machine, the status information of the stored child devices in the storage means, said plurality
And transmitting means for constantly transmitting to each of the plurality of slave units even if there is no transmission request from the slave unit . More specifically, the wireless communication device
Therefore, each of the plurality of slave units has a change in the state of the slave unit.
If there is, the state information is transmitted to the wireless communication device .  More specifically, in the wireless communication device,
Each of the plurality of slaves is the wireless communication device.
Storage means for storing the status information of each of the slave units.
Read the status information of the slave unit from the storage means
And display means for displaying the status information of the issued slave unit .  Still another configuration is that, in a wireless communication system including a wireless communication device serving as one or more base stations and a wireless communication device serving as a plurality of slaves, the plurality of slaves include one or more of the one or more slaves. Having means for performing wireless communication with the base station, storing the use state of the plurality of slave units in the base station,
Through the base station, even if there is no request from each slave unit,
Each of the slaves is always informed of the availability of the other slave. In the base station, the communication state of each slave unit is stored, and the other slave units are notified of the communication state. The slave unit can display the communication status of other slave units, and sometimes the availability of communication, on the display unit, so the user only needs to call another slave unit when communication is possible, so unnecessary operations can be performed. There is an effect that it is not done. An embodiment according to the present invention will be described below with reference to FIGS. First, a system configuration diagram of a wireless system according to the present embodiment will be described with reference to FIG. FIG. 1 is a system configuration diagram of the wireless system according to the present embodiment. Reference numeral 101 denotes a base station, which is connected to an exchange 103 via a telephone line 102. Further, the base station 101 transmits the antenna 11 to the slave units 104 to 111 in the area.
2 through a wireless line. In this system, when a base station is connected by a plurality of lines via an exchange and a telephone line 102, a plurality of slave units are located between the base station and the base station.
You can set up a call at the same time. In each slave unit, when there is a change in the state, the power-off state, the standby state when the power is turned on, the communication state, and the like, the information is notified to the base station through the control channel. Next, the internal configuration of the base station and the slave unit will be described with reference to FIG. FIG. 2 is a block diagram illustrating an internal configuration of the base station and the slave unit. First, the internal configuration of the base station will be described. As shown in FIG. 2A, in the base station, the data transmitted by the antenna 112 is received by the wireless reception unit 201. The information transmitted by the data analysis unit 202 is decoded, and the state transmitted as the information of each slave unit is stored in the data storage unit 203. This information is transmitted to each child device by the wireless transmission unit 204. Note that the radio receiving unit 201, the data analyzing unit 202, and the radio transmitting unit 204 in the base station are controlled by the control unit 205, respectively. A channel for transmitting control information is assigned one of time-division slots, and is always transmitted from the base station. Next, the internal configuration of the slave unit will be described.
As shown in FIG. 2B, the slave set in the standby state by turning on the power always receives the control information from the base station. The data is received by the wireless receiving unit 302 through the aerial line 112, and the data is analyzed by the data analyzing unit 303.
This control information is analyzed as data. The data information includes the number of each slave, the status of the slave, and the like. Of course, it is also possible to determine whether or not the slave unit is currently available based on the state of the slave unit. The analyzed data is
The data is stored in the data storage unit 304. When information different from the stored information is input as control information, this information is rewritten. On the other hand, each slave unit controls the change of the state by the control unit 30.
9, and the control unit 309 transmits from the wireless transmission unit 301 to the base station using the control channel. When the user wants to view this information, he or she inputs a display request for this information by operating the key 305 of the slave unit. The input key information is decoded by the operation unit 306. In response to the display request, the information of each slave unit is read from the data storage unit 304,
The display control unit 307 displays the slave unit information on the display unit 308. Note that the wireless reception unit 302, the data analysis unit 303, the operation unit 306, and the display control unit 307 in the slave unit
9 respectively. Next, a display example of the communication status in the slave unit will be described with reference to FIG. FIG. 3 is a front view of the slave unit when the communication state is displayed on the display unit. In the example shown in FIG. 3A, the slave unit number of the slave unit whose status is to be displayed is displayed as "P1", and the slave unit status during communication is displayed as "Push". In the example of FIG. 3B, it is shown that the slave unit having the slave unit number "P2" is usable and can be called from another slave unit. The switching of these display states can be performed by a display mode switching key k1. In addition, the display information can be displayed one after another by the scroll control function by pressing the scroll key k2. According to the present invention, when there is a base station and a plurality of slave units, the communication state between the slave units can be mutually known to perform communication between the slave units. It is possible to provide a wireless communication device and a wireless communication system that are easy to use when performing communication between slave units.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system configuration diagram of a wireless system according to an embodiment. FIG. 2 is a block diagram illustrating an internal configuration of a base station and a slave unit. FIG. 3 is a front view of the slave unit when a communication state is displayed on a display unit. [Description of Signs] 101: base station 102: telephone line 103-
Reference numeral 111: slave unit 112: antenna 201: wireless reception unit 202: data analysis unit 203
Data storage unit 204 wireless transmission unit 205 control unit 301 wireless transmission unit 302 wireless reception unit 303
Data analysis unit 304 Data storage unit 305 Key 306
Operation unit 307 display control unit 308 display unit 309
Control unit k1: Display mode switching key k2: Scroll key
──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ichiro Murata 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Within the Information and Communication Business Department, Hitachi, Ltd. (72) Inventor Kazuyuki Tate 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Yukihiro Shimura 5-7-1 Shiba, Minato-ku, Tokyo NEC Corporation (72) Inventor Reiko Nakazato 1-7-12 Toranomon, Minato-ku, Tokyo Oki (56) References JP-A-5-153039 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H04Q 7/ 00-7/38 H04B 7 /24- 7/26