JPH04199920A - Mca satellite relay system - Google Patents

Abstract

PURPOSE:To expand a service area by relaying communication between the terminal of a radio base station and the terminal of a satellite repeater station by means of alternately transmitting control data used at the radio base station and control data used at the satellite repeater station in the radio base station. CONSTITUTION:Communication is relayed by transmitting a signal to a terminal station after the radio wave of a frequency F1 from the radio base station is received and the frequency is converted into F1' at the satellite repeater station and by transmitting the signal of a frequency F2' from the terminal station to the radio base station after it is converted into a frequency F2 by way of the satellite repeater station. Communication between the terminal of the radio base station and the terminal of the satellite repeater station is relayed by alternately transmitting control data used at the radio base station and control data used at the satellite repeater station in the radio base station. Thus, the service area of the radio base station is expanded by only adding a simple function which is frequency conversion as the function of the satellite repeater station.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a relay system for contributing to expanding the service area of an MCA land mobile radio system.

(Prior art) The MCA land mobile radio system is either a large-zone radio system that requires a wide service area for each radio base station, or a large-zone radio system that requires a wide service area for each radio base station. Dead areas are occurring, and a solution is essential.

The McA land mobile radio system is a multi-channel access radio system in which multiple communication channels are used by multiple terminal stations in a time-sharing manner, and data communication is performed on two communication channels and a control channel for managing the terminal stations. I am doing it.

(Problem to be Solved by the Invention) By the way, in order to eliminate dead areas within the service area, it is sufficient to install more wireless base stations. However, in the 2MCA land mobile radio system, a closed communication range is set for each radio base station. Therefore, communication between terminal stations between the radio base station installed in the dead area and the basic radio base station is not possible, but it is not a practical measure to expand the service area.

The present invention has been made with these points in mind and provides a satellite relay system that can expand the service area by a simple method.

(Means for Solving the Problems) The present invention is a system in which control data to be transmitted through a control channel at a satellite relay station of an MCA radio system is relayed by frequency conversion. The MCA satellite relay method is characterized in that communication can be relayed between a wireless base station terminal and a satellite relay station terminal by alternately transmitting control data and control data used at the satellite relay station. .

(Example) Embodiments of the present invention will be described together with its principles.

What is the satellite relay system to which the present invention is applied?

As shown in Figure 1, radio waves of frequency F1 from the wireless base station are received at the satellite relay station and the frequency is changed to F'.
, and then transmits the signal to the terminal station, transmitting the signal at frequency F' from the terminal station to frequency F2 via the satellite relay station.
This method relays communications by converting the data into

In the case of the MCA land mobile radio system as well, the relay of communication channels can be handled by the above method.

However, whether the control channel is the content of control data or not, as in Figure 2,
As shown in FIG. 3, the information is different depending on whether it is transmitted from a wireless base station or from a terminal station.

For example, control data transmitted from a wireless base station includes frequency data specific to the wireless base station.

As it is, it will not work as a system because it is different from the frequency data of the satellite relay station.

As a countermeasure to this problem, a method of converting frequency data at the satellite relay station may be considered, but the satellite relay station would be as complicated or more complicated than the wireless base station, which would be uneconomical.

One solution to this problem in the present invention is to alternately send two types of control data from the radio base station, as shown in FIG.

In this case, the terminal station belonging to the radio base station operates according to A control data, and the terminal station belonging to the satellite relay station operates according to B control data. here.

By making the contents of both control data the same except for the frequency data, the terminal station belonging to the radio base station and the terminal station belonging to the satellite relay station perform the same operation with the only difference being the frequency. Also, since one frequency is converted at the satellite relay station,
When viewed from the wireless base station, the terminals appear to belong to and operate at the same station.

As a result, communication can be performed between the terminal station of the radio base station and the terminal station of the satellite relay station.

Based on the above, placing satellite relay stations in blind areas of the service area will greatly contribute to expanding the service area.

(Effects of the Invention) As described above, the present invention can expand the service area of a wireless base station by simply adding the simple function of frequency conversion as a function of a satellite relay station.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the satellite relay system according to the present invention, and FIGS. 2 and 3 are diagrams for explaining the contents of control data of a control channel, respectively. FIG. 4 is a diagram for explaining control data according to the present invention. In the figure, T, TT are transmitters, R, R X xi' x2 x xi'
Rx2 is the receiver.

Claims (1)

[Claims] 1) A method in which a satellite relay station of an MCA wireless system relays control data transmitted through a control channel by frequency conversion, and the wireless base station uses control data used at the wireless base station and control data used at the satellite relay station. The MCA satellite relay method is characterized in that communication can be relayed between a terminal of a wireless base station and a terminal of a satellite relay station by alternately transmitting the following.