JP2575376B2 - Mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention distributes a service area for a plurality of mobile stations to a plurality of fixed stations, and allows the mobile stations to communicate with each other via the fixed stations. The present invention relates to a mobile communication system of a mobile communication system for performing communication and communication between a mobile station and a wired communication device via a fixed station and a control station (prior art). FIG. As shown in FIG. 2, the service area for the plurality of mobile stations 1-1 to 1-n is, for example, three radio service zones 2-1 to 2-n.
3, fixed stations 3-1 to 3-3 are provided for each zone, and a common control station 4 is provided for the fixed stations 3-1 to 3-3. A mobile communication system connected by a wired line, and further connected to a wired communication device 6 to the control station 4 via an exchange 5 to enable communication between mobile stations and between the mobile station and the wired communication device 6 There is.

In this mobile communication system, mobile stations 1-1 to 1-1
-N and the fixed stations 3-1 to 3-3 are connected by a communication channel for communication and a control channel for transmitting and receiving a control signal before the start of the communication, and the mobile station and the fixed station are not connected in a standby state. Also wait on the control channel to monitor the start of mutual communication. However, for example, when the mobile station 1-1 sends a call or transmits a position registration signal for registering its own position to the control station 4 through the control channel, the fixed station 3 close to the mobile station 3
-1,3-2 receives this and relays it to the control station 4.

At this time, the fixed stations 3-1 and 3-2 relay the transmission signal from the mobile station 1-1 to the control station 4 and simultaneously transmit a signal representing the received electric field strength from the mobile station 1-1 to the control station 4. I do. Then, the control station 4 determines which of the fixed stations 3-1 and 3-2 has the higher received electric field strength based on the signal indicating the received electric field strength. It is assumed that the fixed station 3-1 is located at the closest distance to the mobile station 1-1, and the location of the mobile station 1-1 is determined as the wireless zone 2-1. The fixed station 3-1 is in charge of the communication of the station 1-1,
Wired communication device 6 via another mobile station or control station 4
Communication with the user.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional system, in order to select a fixed station that relays communication with the mobile station, (a) a plurality of fixed stations that have received a signal from the mobile station, Since the control station notifies the control station of the received electric field strength and (b) then compares the received electric field strength at the control station and selects one fixed station under the best communication conditions, the received signal is received by the fixed station. It is necessary to provide an electric field strength detection means and a transmission means for the detection strength, and further provide a control station side with a means for comparing with a means for demodulating a signal of the detection strength. Further, there is a problem that it takes time to select a fixed station, and connection delay becomes long.

An object of the present invention is to provide an inexpensive mobile communication system with a short connection delay.

[Configuration of the Invention] (Means for Solving the Problems, Action) The present invention has a fixed station connected to a wired line, and a plurality of mobile stations that set up the fixed station and a wireless line. In mobile communication systems that communicate between mobile stations and between wired communication devices and mobile stations via fixed stations, the mobile station manually registers an identification code for identifying the fixed station that relays its own transmission signal. And transmitting a control signal based on the identification code registered by the registration means when setting up a wireless line, thereby transmitting a transmission signal from the mobile station to the designated fixed station. The communication is performed by relaying.

(Embodiment) FIG. 1 is a format diagram showing a signal format of a call signal or a location registration signal transmitted by using a control channel in the present invention. A mobile station has its own station next to a preamble and a frame synchronization signal FS. It transmits the identification code ID (A) of the fixed station to which the transmission signal is to be relayed and the identification code ID (B) of its own station, and then transmits the necessary control signal.

In this case, the identification code ID (A) of the fixed station is determined by operating a switch provided on the operation unit of the mobile station or by the identification code ID.
The setting may be made by a method such as mounting a card type cartridge on which (A) is recorded. Such an identification code ID (A)
The transmission signal from the mobile station including the above is received by a plurality of fixed stations close to the mobile station. However, only the fixed station having the number matching the identification code ID (A) responds, and continues the necessary processing for the control station.

Therefore, the fixed station does not need to detect the received electric field strength from the mobile station, and the control station does not need to perform the process of selecting the fixed residence, and the means for this is not required.

In this case, the mobile station transmits its own identification code.
It is better to inform the operator of the ID (A), but as shown in FIG. 2 (a), the light emitting indicators 10-1, 10-2, 10-3 corresponding to the wireless zone are set to the mobile station. Provided in the operation unit 10 of
One of the light-emitting displays corresponding to the transmitted identification code ID (A) may be turned on. Alternatively, as shown in FIG. 2B, a seven-segment display 10-4 is provided.
-4, the code of the wireless zone corresponding to the identification code ID (A) or the code of the fixed station may be displayed.

In this case, it is premised that the operator of the mobile station knows in advance which fixed station is the shortest distance with respect to the own station, so that the operator has sufficient knowledge of the arrangement position of the fixed station. It is most suitable for mobile communication systems on a large scale.

[Effects of the Invention] As described above, according to the present invention, after manually inputting an identification code of an arbitrary fixed station from a mobile station, a calling operation such as a calling operation is performed, thereby holding the identification code. Since the fixed line is directly accessed to relay the transmission signal from the own mobile station to establish a wireless channel and communicate with the other mobile station or the wired communication terminal, each fixed station receives from the mobile station. There is no need to provide hardware for detecting the electric field strength and selecting the one with better reception sensitivity to set the radio line, which can contribute to simplification of the configuration of the fixed station and cost reduction.

In addition, since the identification code registered at the mobile station is included in the control signal such as the call signal and the position registration signal and transmitted to the fixed station, the relay operation at the fixed station is linked with the call operation and the position registration operation. In this case, the communication can be shifted to the communication as it is, the time for selecting the fixed station can be reduced, and the connection delay can be minimized.

[Brief description of the drawings]

FIG. 1 is a format diagram showing a signal format transmitted from a mobile station to a fixed station in the present invention, FIG. 2 is a diagram showing an example of means for identifying and displaying a fixed station designated by the mobile station, and FIG. FIG. 11 is a system block diagram illustrating a configuration of a conventional mobile communication system. 1-i to 1-n mobile station, 2-1 to 2-3 wireless zone, 3-1 to 3-3 fixed station, 4 control station, 5
... exchange station, 6 ... wired wireless device, 10-1 to 10-3 ... light-emitting display, 10-4 ... 7-segment display.

Continuation of the front page (72) Inventor Norio Ishikawa 3-1-1 Asahigaoka, Hino-shi Toshiba Hino Factory Co., Ltd. (56) References JP-A-58-66436 (JP, A) JP-A-60-139034 JP, A)

Claims (3)

(57) [Claims] 1. A fixed station connected to a wired line, and a plurality of mobile stations for setting up a wireless line with the fixed station. In a mobile communication system that performs communication between stations, the mobile station has a registration unit for manually registering an identification code for identifying a fixed station that relays its own transmission signal. Transmitting a control signal based on the identification code registered by the registration means, so that the designated fixed station relays a transmission signal from the mobile station to perform communication. 2. The mobile communication system according to claim 1, wherein said registration means performs registration by inputting said identification code by an operation unit provided in said mobile station. 3. The registration unit according to claim 1, wherein the registration unit performs the registration by reading the identification code from a storage medium storing the identification code by a reading unit provided in the mobile station. ).