JPH066298A - Private radio telephone equipment - Google Patents

Abstract

PURPOSE:To remarkably improve operability, and also, to miniaturize a mobile machine by providing the mobile machine which can be used in common with a private radio telephone system and an existing public radio telephone system. CONSTITUTION:In a private radio telephone system, a private radio telephone service area is constituted in a service area of a general public radio telephone service network, public radio telephone network interface part 8 is provided in a central control part 7 for executing control of plural private base stations 6, and a service detecting part 4 and a transmitting power control part 3 are provided in a mobile machine 1, by which a radio part is used in common and the same mobile machine is used as a private radio terminal in a private radio area and is used as a public network terminal in the outside of the private radio area, respectively.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a wireless telephone service system.

[0002]

2. Description of the Related Art In recent years, wireless telephone devices have come into widespread use along with improvements in convenience and economy, and in particular, cellular telephones have come into widespread use as car phones, mobile phones, and private phones. There is. FIG. 2 shows a block diagram of a conventional indoor radio telephone device. In FIG. 2, reference numeral 10 designates a mobile device, which is a mobile device internal radio section 11 for performing wireless communication with a local wireless telephone service network, a mobile public radio section 12 for performing wireless communication with a public wireless telephone service network, and a wireless service. It is composed of a service selection unit 13 for selecting a type and a voice interface unit 14 for interfacing voice with a wireless unit. Reference numeral 15 is a local base station that performs on-premises wireless communication with the mobile device 10, 16 is a central control unit that controls a plurality of local base stations 15 and connects to a wired line, and 17 is a public base station that performs public wireless communication with the mobile device 10. There is one.

The operation of the conventional on-premises radiotelephone device constructed as described above will be described below. Premises base station
It is assumed that a plurality of 15 are installed to construct a wireless telephone service area on the premises, and wireless transmission procedures such as used frequencies are separated from the public wireless telephone network so that they do not interfere with each other. First, when the mobile device 10a is in the above-mentioned indoor service area, when the indoor wireless service is selected by the user's button operation or the like, the service selecting unit 13 causes the voice interface unit 14 inside the mobile device 10a and the inside of the moving mechanism. When the wireless unit 11 is connected and the mobile device 10a makes a call, the mobile device 10a receives radio waves from a plurality of indoor base stations 15, and selects the base station in the best condition (for example, 15a) and registers the location. And then communicates with the local base station 15a. Calling information (telephone number, etc.) of the mobile device 10a is sent to the central control unit 16 via the local base station 15a,
The central control unit 16 connects to a wired public telephone line or another mobile device in the in-house wireless telephone network according to the calling information. If the call is not available outside the in-house wireless service area, the mobile device 10a is notified to that effect. When the public wireless service is selected, the service selection unit 13 connects the voice interface unit 14 and the mobile device public wireless unit 12 in the mobile device 10a, and is connected to the public base station 17 by the same procedure. You can talk on the service network. At this time, the services of each other do not interfere with each other, so that they can operate mutually by switching the radio unit of the mobile device.

[0004]

However, in the above-mentioned conventional indoor radiotelephone apparatus, which service the user wants to receive, since it is necessary to have the indoor radio section and the public radio section independently in the mobile device. Therefore, it becomes necessary to switch the service by button operation and the operation becomes complicated. In addition, there is a problem in that the internal processing becomes complicated and the size of the mobile device cannot be avoided. The present invention solves the above-mentioned conventional problems, configures a private radio telephone system with almost the same specifications as the existing public radio telephone system, shares the private radio unit and the public radio unit in the mobile device, and further It is an object of the present invention to provide an on-premises wireless telephone device capable of significantly improving operability and downsizing a mobile device by automatically determining whether or not it is possible.

[0005]

In order to achieve the above-mentioned object, the present invention is constructed in a first radiotelephone service network covering a wide range and has the same radio transmission procedure as that of the first radiotelephone device. However, in the second radio telephone service network covering a narrow range, a plurality of base stations, a central control unit for controlling the base stations, and a mobile station within the area of the second radio telephone service network are provided. A service detection unit that detects
A power control unit for controlling transmission power is provided, and the central control unit is provided with a first wireless telephone network interface.

[0006]

With the above structure, the present invention enables the same mobile unit to be freely connected to a public or public wireless service network, and can improve operability and reduce the size of the mobile unit.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of a local wireless telephone device in an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a mobile device, a wireless unit 2 that performs wireless communication with a wireless telephone service network, a power control unit 3 that controls the transmission power of the wireless unit 2, and whether the mobile device is in a local wireless service area. In order to detect whether it is in the area, the power control unit 3 lowers the transmission power of the wireless unit 2 to communicate only with the base station 6 in the area, and directly communicates with the public base station 9 in the area outside the area. It is composed of a service detection unit 4 which selects a wireless telephone network to be connected by controlling to increase transmission power, and a voice interface unit 5 which interfaces between voice and a wireless unit. 6 is a local base station that performs local wireless communication with the mobile device 1, 7 is a central control unit that controls a plurality of local base stations 6 and can be connected to a wired public line, and 8 is a local wireless service that is connected to the central control unit 7 A public wireless telephone network interface unit that communicates with a public wireless telephone network installed outside the area, and a public base station 9 that performs public wireless telephone communication with the mobile device 1.

The operation of the indoor radiotelephone device configured as described above will be described below. First, it is assumed that a plurality of indoor base stations 6 are installed to construct a local wireless telephone service area (sub area), and the sub area is included in the public wireless telephone service area. If the premises radiotelephone system has almost the same specifications as the existing public radiotelephone service system, the radio part in the mobile device can be shared and the two systems can be supported, but interference between both systems poses a problem. Therefore, in the present embodiment, a sub-area of the in-house wireless telephone is constructed in a part of the existing public wireless telephone service area, and the radio field intensity from the public wireless telephone service network coming into the sub-area is higher than that. , Providing on-site wireless service with a certain level of strong radio wave strength. This can be easily realized by appropriately arranging the on-premise base station because the distance from the public base station is much longer than that on the on-premise base station. If the radio wave from the public base station is strong, it can be dealt with by arranging the local base stations densely to form a micro cell. As a wireless transmission method, for example, if an FM (frequency modulation) method in which there is a level difference of a certain level or more and almost no interference occurs, a communication partner can be selected according to the strength of radio waves.

Next, the operation will be specifically described. A case of making a call from the mobile device 1 in the sub area will be described. The radio wave from the local base station 6 is received by the wireless unit 2 in the mobile device 1a, and the service detecting unit 4 determines whether the partner is a local base station or a public base station. As a determination method, there is a method such as partially different communication protocols in both systems, which also provides a function for preventing erroneous connection when interference occurs. In this case, it is determined that the sub-area is present, the transmission power of the radio unit 2 is reduced by the power control unit 3, and the radio wave from the mobile device 1 reaches the local base station 6 but cannot be received by the public base station 9. Level. At this time, the radio wave from the public base station 9 is transmitted to the mobile unit 1
However, it is possible to prevent accidental communication with the public base station 9 because it is covered by the radio waves of the stronger local wireless service. When the callee information (telephone number or the like) is designated from the mobile device 1, the information is sent to the central control unit 7 via the in-house base station 6 that provides the service of the mobile device 1. In accordance with the information, the central control unit 7 performs processing such as connecting to another mobile station in the network, a wired public line, or directly emitting a radio wave to a public base station. When the line is connected, the voice interface unit 5 and the wireless unit 2 are connected via the service detecting unit 4 and a call is possible.

Next, the case of an incoming call to the mobile device 1 will be described. An incoming call from another mobile device in the sub area or a wired public line is the same as the conventional incoming call operation. The incoming signal from the public base station 9 cannot receive the radio wave of the public base station 9 directly by the mobile station 1 because the radio wave of the local radio service is strong in the sub area. This radio wave is received by the public wireless telephone network interface unit 8 located outside the sub area, the communication procedure is converted from the public wireless service to the local wireless service, and the central controller 7 performs the service of the mobile device 1. The incoming base station 6 transmits an incoming call signal to the mobile device 1. When the mobile device 1 responds to the incoming call, first, the local base station 6 detects the incoming call response signal of the mobile device, and the central control unit 7 determines that the incoming call response signal is for the public base station. This incoming signal is sent to the public wireless telephone network interface unit 8. In the public wireless telephone network interface unit 8,
The communication procedure is converted from the local wireless service to the public wireless service, and an incoming call response signal is returned to the public base station 9.

In this way, the mobile station 1 in the sub area and the public wireless telephone network can be connected. Moreover, the user does not need to be aware of whether he is using the local radio or the public radio. Further, as a simple application of this embodiment, when a call is made to the public wireless telephone network from within the sub area, the central control unit 7 considers the conditions such as the telephone charge of the public line, or the wired public line network or It is also possible to select whether to directly connect to the public base station 9 by the public wireless telephone network interface unit 8, and it is possible to reduce the call cost.

[0012]

As is apparent from the above embodiments, the present invention constructs a private wireless telephone service area within a service area of a general public wireless telephone service network, and a public wireless telephone interface is provided to a conventional private wireless telephone device. By providing the service detection unit and the transmission power control unit in the mobile unit and the mobile unit, it is possible to use the same mobile unit as the private wireless terminal in the private wireless area and as the public network terminal outside the private wireless area. Have.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a local wireless telephone device in an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional indoor radio telephone device.

[Explanation of symbols]

1, 10 ... Mobile unit, 2 ... Radio unit, 3 ... Power control unit,
4 ... Service detection unit, 5, 14 ... Voice interface unit, 6, 15 ... On-premise base station, 7, 16 ... Central control unit,
8 ... Public wireless telephone network interface unit, 9, 17 ... Public base station, 11 ... Mobile mechanism internal radio unit, 12 ... Mobile public wireless unit, 13 ... Service selection unit.

Claims (2)

[Claims] 1. A second radiotelephone service network which is constructed in a first radiotelephone service network covering a wide range and has a radio transmission procedure similar to that of the first radiotelephone device and which covers a narrow range. , A plurality of base stations, a central control unit that controls the plurality of base stations, a service detection unit that detects that the mobile device is within the area of the second wireless telephone service network, and controls transmission power A power control unit, and when the service detection unit determines that the area is within the area of the second wireless telephone service network, lowers the transmission power of the handset and uses the second terminal as a second terminal. Outside the area, the indoor wireless telephone device is characterized in that it can be used as a first terminal by increasing the transmission power. 2. The central control unit has a public wireless telephone network interface for performing wireless communication with the first wireless telephone service network, and transmits and receives radio waves transmitted and received by a mobile station receiving the second wireless telephone service network. 2. The indoor radiotelephone device according to claim 1, which is relayed and connected to the first radiotelephone service network.