JPS5843939B2 - Mobile communication method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile communication system, and more specifically, in a mobile communication system that adopts a multi-station control system, prior to a call, each communication method is used to set up a wireless line with a mobile device. The present invention relates to a method for monitoring phase shifts between radio channel control signals transmitted from radio base stations.

Generally, in a land mobile radio system using a small radio zone system, several small zones are grouped together into one control zone, and a radio network control station is installed to control the base stations of each of these small zones.

FIG. 1 shows an overview of the configuration of such a conventional mobile communication system, in which 1 is a mobile device, 2 is a wireless base station, 3 is a wireless zone, 4 is a wireless network control station, and 5 is a control signal transmission path. , 6 are communication transmission lines.

Note that the radio network control station 4 is connected to a general telephone network via a mobile switching center (not shown).

Now, in the case of the figure, the radio network control station 4 controls three base stations 2.

Before the mobile device 1 makes a call with a fixed subscriber (regular telephone subscriber) through the communication transmission path 6 via the base station in the zone in which the mobile device 1 is located, the mobile device 1 establishes a communication with the radio network control station 4. A radio line control signal for setting up a radio line for communication is exchanged between the two terminals through a control transmission line 5.

When mobile device 1 starts a call, it does not know which wireless zone it is in, so multiple base stations 2 simultaneously transmit wireless channel control signals toward mobile device 1 to determine the zone in which it is located. A multi-station control method is used.

In this case, radio channel control signals are transmitted from the plurality of base stations 2 through the control transmission path 5, but if the transmission channel between the radio channel control station 4 and the base station 2 is switched due to a failure,
Even if radio channel control signals are sent from the radio channel control station 4 to each base station at the same time, they do not arrive at each base station at the same time.

Then, the radio channel control signals transmitted from each base station will be received by the mobile device 1 at different times, resulting in signal errors.

Therefore, it is necessary to always measure the delay time between the radio network control station 4 and the base station 2 for each base station, and to know changes in the amount of delay.

By the way, since at least two lines are required for wireless line control, a method for measuring the amount of delay for each line is required, which has the disadvantage of complicating the equipment and increasing costs. .

The present invention has been made to eliminate the drawbacks of the conventional system as described above, and therefore, an object of the present invention is to improve communication between a radio network control station and a base station in a mobile communication system that employs a multi-station control system. An object of the present invention is to provide a mobile communication system that eliminates the need to measure live signal transmission delay for each of a plurality of lines.

The key point of the configuration of the present invention is to multiplex control signal transmission between a radio network controller and a base station, and transmit a frame synchronization signal of the multiplexed signal transmitted from the radio network controller to the base station from the base station to the radio network. Used as a frame synchronization signal for multiplexed signals transmitted to a control station.
The present invention is configured to monitor the phases of these two frame synchronization signals.

The drawings will be explained in detail below. FIG. 2 is a block diagram showing the main parts of an embodiment of the present invention, in which 7 is a radio network control station controller, 8 is a frame synchronization signal, 9 and 10 are radio network control signals, and 11 1 is a base station control signal, 12 is a multiplexer, 13 is a demultiplexer, 14 is a frame synchronization signal, 15 and 16 are radio channel control signals, 17 is a base station control signal, 18 is a clock signal, 1
9 and 20 are transmitters and receivers, 21 is a base station controller,
22 and 23 are radio channel control signals, 24 is a base station control signal, 25 is a multiplexer, 26 is a demultiplexer, 27 is a frame synchronization signal, 28 and 29 are radio channel control signals, and 30 is a base station control signal. , 31 are phase measuring devices, and as shown in the figure, they are installed separately on the radio network control station 4 side and the base station 2 side.

A frame synchronization signal 8 is sent from the radio network control station controller 7.
, radio channel control signals 9 and 10, and a control signal 11 for controlling the base station are sent out and input into a multiplexer 12.

The multiplexer 12 is a device that multiplexes the control signals 9, 10, and 11, and the frame synchronization signal 8 is synchronized when it is separated into the respective control signals 15 to 1γ by the base station side separation device 13. inserted for.

Control signals 15 and 16 are transmitted from transceivers 19 and 20 to the mobile device.

Further, the base station control signal 17 is input to the base station control device 21.

Outputs 22, 23 of the transceiver and output 2 of the control device 21
4 is multiplexed by the multiplexer 25 and transmitted to the radio network control station 4.

At this time, the frame synchronization signal 14 separated by the separation device 13 is used as the frame synchronization signal of the multiplexer 25.

Further, the clock 18 reproduced by the demultiplexing device 13 is used as the clock of the multiplexing device 25.

A separation device 26 in the radio network control station 4 separates the multiplexed signal into control signals 28 to 30 and a frame synchronization signal 27.

Therefore, if the phase difference between the frame synchronization signal 8 of the multiplexer 12 and the frame synchronization signal 27 of the demultiplexer 26 is measured, this value can be calculated from the radio network controller to the base station to the radio network controller. This corresponds to the delay time of

This is measured by the phase difference measuring device 31.

Therefore, by monitoring the phase difference of the frame synchronization signal with the device 31, it is possible to know the change in the amount of delay in the transmission path between the radio network control station and the base station, and when this amount of change exceeds a certain value, there is a delay. You can move on to adjusting the amount.

As explained above, in the present invention, a radio network control station,
Control signal transmission between base stations is multiplexed, and the base station uses the frame synchronization signal of the multiplexed signal from the radio network control station as it is as the frame synchronization signal of the multiplexed signal to the radio network control station. At the line control station,
By measuring the phase difference between the frame synchronization signals of the multiplexer and the demultiplexer, changes in the amount of delay in the transmission path can be determined.

By the way, if control signal transmission is not multiplexed, it is not only necessary to monitor the phase of each transmission path, but also to add a special signal to measure the phase difference. There is also the advantage that phase monitoring becomes easier by multiplexing signals and using the frame synchronization signal as a phase monitoring signal.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the configuration of a conventional mobile communication system, and FIG. 2 is a block diagram showing the main parts of an embodiment of the present invention. Explanation of symbols: 1...Mobile device, 2...Base station, 3...Wireless zone, 4...Radio line control station, 5... ...Control signal transmission line, 6...
. . . Telephone transmission line, 7 . . . Radio line control station control device, 8, 14, 27 . . . Frame synchronization signal, 9, 10, 16, 17, 22, 23° 28 , 29・
...Radio line control signal, 11, 17°24, 3
0... Base station control signal, 12, 25...
・Multiplexing device, 12, 26... Separation device, 19
, 20... Transmitter/receiver, 21... Base station control device, 31... Phase measurement device.

Claims (1)

[Claims] 1. The radio base station located in each radio zone, the radio network control station that controls the radio base station, and the mobile switching center that connects the radio network control station and the general telephone network, Before a mobile device located within a control zone consisting of a set of each of the wireless zones makes a call to a general telephone line via a wireless base station, a wireless network control station, and a mobile device switching center,
In a mobile communication system in which a radio network control station simultaneously sends and receives radio channel control signals to and from a mobile device via each base station in order to set up a radio channel, the radio network control station and each base station , a multiplexing device and a demultiplexing device are installed for the radio channel control signals sent and received between the two stations, and the base station separates the frame synchronization signal from the multiplexed signal sent from the radio channel control station, and then transmits the frame synchronization signal directly to the same station. A means for inserting and transmitting a frame synchronization signal of a multiplexed signal is further provided, and the radio network control station transmits the frame synchronization signal included in the multiplex signal and the frame synchronization signal sent back by the multiplex signal from the base station to the base station. A mobile communication system characterized by further comprising means for extracting and comparing and measuring the phase difference.