JPH0389636A - Interference wave detection control system - Google Patents

Abstract

PURPOSE:To continue the service without being interrupted even at the time of generation of an interference wave by switching the control channel to an unused mobile station reserved control channel or a mobile station current control channel at the time of the occurrence of an interference wave to a mobile station control channel carrier wave. CONSTITUTION:A mobile station control part 1-3 monitors a mobile station current control channel carrier wave 4 from a base station 2 which is reported from a mobile station receiver 1-2; and if reception information is not normal and an interference monitor timer value is larger than a detection reference value, the occurrence of interference is judged to control a mobile station transmitter 1-4, and it is reported to the base station by a base station control channel carrier wave 6, and an interference monitor timer is cleared. When the base station 2 receives the disturbing wave occurrence report of the mobile station current control channel carrier wave from a mobile station 1 by the base station control channel carrier wave 6, a base station control part 2-1 switches the control channel carrier wave to the mobile station reserved control channel carrier wave and transmits it through a reserved control channel transmission antenna 2-5-2 by a mobile station reserved control channel 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to mobile communication systems, and particularly to an interference wave detection control method.

[Conventional technology]

Conventionally, this type of interference wave detection has only been performed on control channels transmitted from a mobile station to a base station.

[Problem to be solved by the invention]

In the conventional mobile communication interference detection described above, in order to simplify the system, the mobile station monitors only the base station control channel sent to the base station, and monitors only the base station control channel sent from the base station to the mobile station. Because there is no monitoring, when interference waves occur on the mobile station control channel, the mobile station has the disadvantage that it is not aware of the disturbance caused by the interference waves until it receives a complaint from a customer, and service is interrupted during that time.

It is an object of the present invention to detect interference waves mixed in a mobile station control channel transmitted from a base station to a mobile station, to report the interference wave mixing information from the mobile station to the base station, and to detect interference waves mixed in a mobile station control channel sent from a base station to a mobile station. It is an object of the present invention to provide a mobile communication system that prevents communication failure due to interference waves mixed into a mobile station control channel by switching the carrier frequency of a control channel from active to standby or from standby to active.

[Means to solve the problem]

The interference wave detection control method for mobile communication of the present invention includes an interference wave detection means for detecting interference waves for a control channel transmitted from a base station to the mobile station, and an interference wave detection means for detecting interference waves for a control channel transmitted from a base station to the mobile station, The mobile station is equipped with an interference wave status reporting means that reports on a control channel transmitted from the mobile station, and receives and analyzes interference wave status information transmitted from the mobile station, and transmits information from the base station to the mobile station based on the information. The base station is provided with carrier frequency switching means for switching the carrier frequency of the control channel to be transmitted from active to standby, or from standby to active.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a mobile communication system according to an embodiment of the present invention, FIG. 2 is a block diagram of the mobile station 1 shown in FIG. 1, and FIG. 3 is a flowchart for monitoring interference waves of the mobile station 1.

FIG. 1 shows a mobile station 1, a switching device 3, a base station control section 2-1 that operates according to instructions from the switching device 3, and a base station control section 2-
1 controlled by a base station transmitter 2-2. Base station receiver 2-3. A base station 2 consisting of an antenna switching unit 2-4, a working control channel transmitting antenna 2-5-1, a backup control channel transmitting antenna 2-5-2, and a receiving antenna 2-6.
, a mobile station working control channel carrier wave 4, and an interference wave 5,
It consists of a base station control channel carrier 6 and a mobile station backup control channel carrier 7.

The mobile station 1 in FIG. 2 includes a mobile station antenna 1-1, a mobile station receiver 1-2 that receives information from the base station 2, a mobile station controller 1-3, and a mobile station controller 1-3 that transmits information to the base station. The mobile station transmitter 1-4 consists of a mobile station transmitter 1-4.

The base station control unit 2-1 controls the transmitter 2 according to instructions from the switching device 3.
-2 and the antenna switching unit 2-4 to transmit the mobile station working control channel carrier 4 containing the modulated control information to the mobile station 1 via the working control channel transmitting antenna 2-5-1. . The base station receiver 2-3 receives the base station control channel carrier wave 6 transmitted from the mobile station 1 through the receiving antenna 2.
-6, demodulates the control information superimposed on the base station control channel carrier 6, and sends the demodulated information to the base station controller 2-1. The base station control unit 2-1
It analyzes the information output by the base station receiver 2-3 and performs the required processing for each piece of information sent from the mobile station, and the information used for call connection control in the caller information exchange device is transferred to the exchange device 3. Transfer navel data.

The mobile station receiver 1-2 receives the mobile station working control channel carrier wave 4 transmitted from the base station 2 via the mobile station antenna 1-1.
and outputs demodulation information of the mobile station active control channel carrier wave to the mobile station control unit 1-3. When transmitting subscriber information such as a call request from a subscriber to the base station 2, the mobile control unit 1-3 controls the mobile station transmitter 1-4, and the antenna 1-1
A base station control channel carrier wave 6 is transmitted to the base station 2 via the base station 2 .

Next, the operation will be explained using the flowchart shown in FIG.

The mobile station control unit 1-3 monitors the mobile station working control channel carrier wave 4 from the base station 2 reported from the mobile station receiver 1-2 in step 1, and if there is a received carrier wave, it receives the carrier wave in step 2. The mobile station control information included in the carrier wave is analyzed. In step 3, the normality of the received information analyzed in step 2 is checked. If the received information is not normal, it is assumed that there is a possibility of interference wave generation. In step 4, it is determined whether or not a disturbance wave generation report has been made previously. As a result of the determination in step 4, if no report has been made, the interference monitoring timer is counted up in step 5, and in step 6, the interference wave detection reference value is compared with a preset interference wave detection reference value in order to detect interference waves. If the interference monitoring timer value is less than the preset interference wave detection reference value in step 6, the process returns to step 1 of the reception carrier determination flow. If the interference monitoring timer value is greater than or equal to the detection reference value in step 6, it is determined that interference has occurred and the mobile station transmitter 1-4 is controlled, and in step 7, the base station is notified by the base station control channel carrier wave 6, and In step 8, the disturbance monitoring timer is cleared.

If the interference wave disappears during the generation of the interference wave, in step 1 there is a received carrier wave, and in step 3 the received data is normal, so in step 9 it is determined whether the interference wave raw report has been completed,
If the occurrence of interference waves has been reported, it is determined in the next step 10 whether or not the disappearance of interference waves has not been reported. If the interference wave generation is not reported in step 9, the interference monitoring timer is cleared in step 12. If the interference wave disappearance report has not been made in step 10, the interference wave disappearance report is notified to the base station 2 in step 11, and the interference monitoring timer is cleared in step 12. If the interference wave generation has been reported in step 10, the interference monitoring timer is cleared in step 12.

The base station 2 receives the base station control channel carrier 6 from the mobile station 1.
When the base station control unit 2-1 receives an interference wave generation report of the mobile station working control channel carrier wave, the base station control unit 2-1 detects a backup control channel corresponding to the interference wave generation control channel necessary for switching to the mobile station backup control channel carrier wave 7. If the mobile station does not have control information such as which channel or device it is, it sends a switching request to the switching device 3, receives a mobile station backup control channel carrier switching instruction signal from the switching device 3, and moves. Generate a control signal for switching to the station standby control channel carrier. If the base station control unit 2-1 is equipped with control information for switching to a mobile station control channel carrier, the base station 2-1 generates a mobile station preliminary control channel carrier switching instruction signal without an instruction from the switching device 3. . The base station control unit 2-1 controls the base station transmitter 2-2 using this mobile station preliminary control channel carrier switching instruction signal,
Switching to the mobile station backup control channel carrier provided in the base station transmitter 2-2, and superimposing mobile station control information provided in the base station controller 2-1 onto the mobile station backup control channel carrier in the base station transmitter 2-2. , controls the antenna switching unit 2-4 to transmit on the mobile station preliminary control channel 7 via the preliminary control channel transmitting antenna 2-5-2. As a result, the carrier wave of the mobile station working control channel carrier wave 4 is removed, and only the interference wave having the same frequency as the mobile station working control channel carrier wave remains.

The remaining interference waves are monitored through the flow of steps 1 to 4 in FIG. 3, from reception carrier wave present to reception data abnormality to interference wave generation reported. During this monitoring flow, when the interference wave disappears, in step 1 there is no received carrier wave, and in step 9 it is checked whether there is a report of interference wave generation. As mentioned above, since the occurrence of interference waves has been reported, it is checked in step 10 whether or not there is a report of disappearance of interference waves.If the disappearance of interference waves has not been reported, the mobile station is checked in step 1 in the same way as for reporting the occurrence of interference waves. The transmitter 1-4 is controlled to notify the base station 2 using the base station control channel carrier wave 6, and at the same time, in step 12, the interference monitoring timer is cleared.

The base station control unit 2-1 of the base station 2 receives the reception antennas 2-6 . Upon receiving the interference wave disappearance report via the base station receiver 2-3,
The base station transmitter 2-2 and the antenna switching section 2-4 are controlled to switch and restore the mobile station's current control channel carrier 4. Here, when the interference wave disappears during the countermeasure processing for the generation of interference waves, the mobile station backup control channel carrier wave 7 is switched to the mobile station working control channel carrier wave 4, but the mobile station backup control channel is restored without switching and recovery. It is also possible to use channel carrier wave 7 as is, and switch to mobile station working control channel 4 when interference waves are newly generated on mobile station standby control channel carrier wave 7 and the mobile station receives a notification of the occurrence. Needless to say, [Effects of the Invention] As explained above, the present invention detects the occurrence and extinction of interference waves for a mobile station control channel carrier wave transmitted from a base station to a mobile station, and detects when interference waves are generated. By switching from the active mobile station control channel carrier or mobile station standby control channel to the unused mobile station standby control channel or mobile station active control channel, service can continue without interruption even when interference waves occur. There is an effect that can be done.

[Brief explanation of drawings]

FIG. 1 is a diagram of a mobile communication system according to an embodiment of the present invention. l...Mobile station, 1-1...Mobile station antenna, 1-2
...Mobile station receiver, 1-3...Mobile station control section, 1-
4... Mobile station transmitter, 2... Base station, 2-1...
Base station control unit, 2-2 base station transmitter, 2-3... base station receiver, 2-4... antenna switching unit, 2-5-1.
・・Mobile station working control channel transmission antenna, 2-5-2
... Mobile station preliminary control channel transmission antenna, 2-6.
...Receiving antenna, 3. Switching device, 4. Mobile station active control channel carrier, 5. Interference wave, 6. Base station control channel carrier, 7. Mobile station backup control channel carrier. .

Claims (1)

[Claims] In an interference wave detection control method in a mobile communication system in which information is transmitted and received between a base station and a plurality of mobile stations using radio waves, interference is detected for a control channel sent from the base station to the mobile station. the mobile station, the mobile station comprising: a wave detecting means; and a disturbance wave status reporting means for reporting generation and extinction information of disturbance waves to the control channel on a control channel transmitted from the mobile station; and a disturbance wave transmitted from the mobile station. The status information is received and analyzed, and based on the information, the carrier frequency of the control channel sent from the base station to the mobile station is changed from the current to the reserve,
Alternatively, an interference wave detection and control method for a mobile communication system, characterized in that the base station is provided with carrier frequency switching means for switching from standby to active use.