JP2524115B2 - Wireless communication method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention provides a plurality of wireless transmission / reception mobile stations with a wireless transceiver attached to a telephone subscription line as a fixed station, and when communicating between each mobile station and the fixed station. The present invention relates to a wireless communication method capable of avoiding collision of responses.

"Prior Art" In mobile radio communication systems such as cordless telephones, which perform radio transmission / reception between a fixed station connected to a telephone line and a portable mobile station paired with the fixed station, transmission and reception are generally different. Although frequencies are assigned, if there is only one mobile station as described above, interference problems such as interference and interference hardly occur.

On the other hand, when trying to expand the number of cordless phones, fixed stations and mobile stations had to be paired, and the economy was unavoidable. Therefore, if it is possible to communicate with only one fixed station by adding only a plurality of mobile stations, it will be more economical and convenient, but multiple mobile stations will communicate with a fixed station at the same transmission frequency. In fact, due to the interference, it is difficult to avoid collision of responses and the practical use is hindered.

"Problems to be solved by the invention" Therefore, in addition to proposing a new communication method that was not found in the conventional method, between a plurality of mobile stations and a fixed station without impairing the economical efficiency of the conventional method. It is intended to avoid the collision of responses of.

"Means for Solving Problems" In the present invention, however, a call is started with an ID code which proves that only a base station in a group is allowed to communicate as a call signal from a fixed station to a plurality of mobile stations. By transmitting a code that specifies the line frequency at that time, that is, the call channel frequency, by the control frequency, all the mobile stations that received the response timings each received it, and assigned the above ID code and the mobile station addition order. A response signal including a station number dedicated to its own station is transmitted to a fixed station, and then each mobile station can communicate with each other.

 Hereinafter, the present invention will be described in detail with reference to an example.

[Embodiment] In FIG. 1, which is an embodiment of the present invention, B is a wireless transmission / reception fixed station connected to a telephone line (TL) (hereinafter,
Base station), M ₁ , M ₂ , M ₃ are radio transmitting / receiving mobile stations (hereinafter, mobile stations) in the same territory within the communication range with base station B.
Then, only communication between the base station B and the mobile station is possible, and communication between the mobile stations is not considered in this case. The transmission frequency from the base station B is the reception frequency of each mobile station, and the transmission frequency of each mobile station corresponds to the reception frequency of the base station B.

The communication frequency between the base station B and each mobile station is publicly assigned, and the communication frequency is selectively used for the control channel and the communication channel within a certain frequency band.

Further, a plurality of mobile stations that share one base station B are provided with an ID code that proves that they belong to the territory of the base station B and a code that represents their own station number for each mobile station, When calling a mobile station from the base station B to establish a wireless connection, first, an ID code and a designated code of a communication channel (transmission channel and reception channel of the mobile station) are transmitted from the base station B to all the mobile stations. The ID from the mobile station that was sent using the
The code and its own station number are modulated to the communication channel and transmitted to the base station B.

Multiple mobile stations consist of wireless transceivers that have exactly the same function, and are equipped with the function of switching from the receiving mode to the calling mode when the call switch is connected and disconnected, and the slide code and push switch are used to provide the ID code and own station number code. Is configured to be able to send.

Next, communication between the fixed station and each mobile station will be described with reference to the transmission chart of FIG.

In this embodiment, the base station B receiving the call from the telephone line (TL) transmits a signal S _B (call signal) including an ID code and a call channel designation code using the control channel when the number of mobile stations is three. After transmitting for t _B , the mobile stations M ₁ , M ₂ , M ₃ in the standby mode on the control channel receive the signal S _B all at once, switch the receiving channel based on the call channel designation code, and ring the ringer. And inform you. Therefore, for example, when the mobile station M ₁ promptly enters and responds to the press talk button switch of its own machine, the mobile station M ₁
Is a signal S including the above-mentioned ID code and its own station number code after the delay time (T ₁ ) has passed from the transmission end time (t _o ) of the base station B.
_{The M1} (response signal) is modulated to the designated transmission channel frequency for transmission and transmitted to the base station B for the T _M1 period. The mobile station M ₁ and the base station B enter into a call state only after the base station B which receives the signal returns the signal S _M1 including the same ID code and the other party's station number code. in this case,
The other mobile stations M ₂ and M ₃ which switch the receiving channel based on the signal S _B of the base station B are put in the standby state in the standby reception mode by receiving the signal S _M1 transmitted from the base station B.

Timings T ₁ , T ₂ and T ₃ that can respond to the base station B are set between the mobile stations, and the signal S _B from the base station B is set.
Simultaneously received at t _o the time, but if not Nyuse' the press-to-talk button switch in between deferral time each, when not more after a certain interval period (T _c) is originating self station so as not performed ing. The own station number of the mobile station can be set by a switch provided in each radio transceiver.

[Effect] Thus, in the past, when a mobile station was added, only a fixed station and a mobile station could be added as a set. However, according to the present invention, it is portable and compact with respect to one shared fixed station. Only the mobile station, which is a wireless device, needs to be added, no additional work is required, and the economy is greatly improved as a whole. Also, when communicating between a plurality of mobile stations and a fixed station, the first respondable timing of each mobile station is set to be different, and the timings of the second and subsequent floors are set at fixed intervals so that a response operation can be performed. By making a response transmission at a later timing, the transmission frequency can be executed within a time that does not overlap with the response timing of other mobile stations, so collision obstacles due to interference with other stations can be eliminated and it is extremely useful in practice. Is.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining the present invention, and FIG. 2 is a time chart for communication between a base station and each mobile station. B: base station, M ₁ M ₂ M ₃ : mobile station, S _B : base station transmission signal, S _M1 , S _M2 , S _M3 : mobile station transmission signal, T ₁ , T ₂ ,
T ₃ : Response timing.

Claims (1)

(57) [Claims] 1. A wireless communication method for allowing a single fixed station connected to a telephone line to establish a wireless connection with one of a plurality of mobile stations having the same function, wherein the fixed station is connected to a telephone line. incoming call signal containing a predetermined ID code in the control channel and communication channel designation code (S _B) for a predetermined time (t _B) originating in accordance with, the communication channel to specified by the communication channel designation code (S _B) The plurality of mobile stations waiting for the response signal from the switching mobile station and waiting on the control channel simultaneously receive the ringing signal, and a predetermined timing from this reception is set as a timing for transmitting a response to the fixed station in response to the response operation. After a lapse of time, the first transmission timing set differently for each mobile station and the predetermined time common to all mobile stations from the first transmission timing of each mobile station Based on the subsequent transmission timing having the interval (T _c ), the mobile station which has performed the response operation switches to the call channel according to the call channel designation code (S _B ) in the received call signal, and after the response operation, A response signal including the ID code and its own station number code at transmission timing is transmitted for a predetermined time (t _M ) common to all mobile stations, and the fixed station transmits a response signal transmitted by the mobile station that has performed the response operation. And transmits a connection signal including the ID code and the mobile station station number code in the first received response signal, and the mobile station station number code in the received connection signal matches with its own. A wireless communication method comprising establishing a wireless connection between a mobile station that has transmitted a response signal and the fixed station.