JPH04260232A - Control channel monitoring method in mobile communication systems - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless mobile communication system, and in particular, uses a specific channel among a plurality of channels as a control channel to notify vacant channels among a plurality of communication channels in response to requests from a plurality of mobile terminals. This invention relates to a control channel monitoring method for providing services.

0002

2. Description of the Related Art In a conventional simple mobile radio telephone system, as shown in FIG. This is a mobile communication system in which a specific channel is shared by a plurality of communication channels as a control channel, and calls are made to general terminals of a public communication network connected to an exchange equipment EX. As a monitoring method for this communication system, a test fixed station device TTR, which is different from the base station wireless device T/R, is used.
Then, the radio equipment T/R of the base station intercepts the radio waves of the control channel transmitted and received from the mobile terminal, monitors the state of the control channel, and monitors the presence or absence of interference from other stations to the control channel. There is also a monitoring test method in which failure occurrence ALM of each device T/R, NCE is monitored and tested by each monitoring control device SV.

0003

Problem to be Solved by the Invention The above-mentioned conventional mobile radio telephone system monitoring test method is based on the test fixed station equipment TT.
R simply monitors the presence or absence of interference from other stations to the control channel on the wireless communication path, and the supervisory control device SV simply monitors the occurrence of a failure in each device T/R, NCE.
There has been a problem in that it is not possible to promptly detect and deal with failures such as loss of synchronization of control channels and sudden drops in electric field strength, which are the key points of communication systems. The purpose of the present invention is to
It is an object of the present invention to provide a monitoring method capable of quickly detecting a failure in a control channel of a mobile radio telephone system and taking measures to prevent the system service from deteriorating.

0004

[Means for Solving the Problems] This object is achieved by providing the following functions to the conventional monitoring type test fixed station device TTR, monitoring control device SV, and main control device NCE.

[0005] In TTR, the state of the electric field is always monitored in synchronization with the downlink signal from the control channel base station to the mobile terminal, and when synchronization is lost or sudden fluctuations in the electric field occur, it is necessary to A function is provided to generate a control signal that passes through the supervisory control device SV and notifies the main control device NCE.

[0006] The TTR is provided with a function of monitoring the transmission format of a downlink signal of a control channel representing a call originating from a mobile terminal and an incoming call to the mobile terminal. ■ The TTR has two radio TRs, one in use and one in reserve, for monitoring a single system.
Both TR1 and TR2 can be used independently to monitor multiple systems.
, TR2 is provided with a function to periodically receive the downlink signal of the control channel for each system. In other words, for multiple systems, the first TR1 is SYS 1, the second TR2
monitors the downlink signal of the control channel of SYS 2, and after a certain period of time, the first unit switches to SYS 3, and the second unit switches to SY.
The system is switched to S4 and the downlink signal of the control channel is periodically monitored.

[0007] ■ TTR is activated by the main controller of the base station to make a test call at a fixed period, and if a call link cannot be established with a mobile terminal in the system, shorten the call period. A function will be provided to quickly perform a call test.

[0008] In TTR, the downlink signal of the control channel is constantly monitored in both a single system and multiple systems, and failures in certain systems (out-of-synchronization and electric field fluctuations) are detected.
A function is provided to perform a call test on the faulty system and check its operational status only when an alarm ALM is generated and an alarm ALM is sent.

[0009]

[Operation] In the present invention, referring to the principle diagram of FIG. 1 showing its basic configuration, the test fixed station device TTR is
The adapter unit 1 (11 to 15) generates control signals necessary for each of the above five functions from the output data of the two radios TR1 and TR2, and the two radios TR1, The TR2 constantly monitors the status of the communication system between the base station and the mobile terminal, collects and processes the monitored information in the adapter unit 1, generates the necessary control signal (A), and sends the information to the base station. Notify the station's main controller NCE. Then, the above 5
After that, the two radio devices TR1 and TR2 monitor the system.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a block diagram showing the structure of a control channel monitoring system for a mobile radio telephone system according to an embodiment of the present invention. In FIG. 2, the test fixed station device TTR is (1
) The radio equipment of the base station constantly receives the downlink signal of the control channel transmitted to the mobile terminal, and notifies the main controller NCE of the synchronization information and electric field information through the supervisory controller SV. If a failure occurs in the control channel to the mobile terminal, synchronization may be lost or the field strength may suddenly change, so the downlink signal of the control channel is constantly monitored. (2) In addition to paragraph (1) of the previous section, the command code frame of the transmission format of the downlink signal of the control channel is monitored, and the call origination and call reception between the mobile terminal and the base station radio equipment within it are monitored. When no change in the data regarding the base station is detected, the TTR issues a test call upon activation from the base station's main controller NCE. (3) Even if there are multiple systems to be monitored, 1
Each system periodically receives the downlink signal of the control channel using two TTRs. In other words, TTR radio equipment consists of two radio equipment, T/R1 and T/R2, and in the case of monitoring a single system, two radio equipment, T/R1 and T/R2, are used as the active and standby equipment. Therefore, only one unit is operated, but in the case of multiple systems, the concept of active and backup units is stopped, and the first T/R1 is SYS1, and the second T/R2 is SYS.
The downlink signal of the control channel 2 is monitored, and for a certain period of time (
For example, after 1 minute), the first T/R1 will be SYS 3.
, the second T/R2 switches the system to SYS 4 and monitors the downlink signal of the control channel. (4) If an alarm ALM is sent due to loss of synchronization or a change in the state of electric field fluctuation during the periodic alternate monitoring of the system as described in (3) of the previous section, the base station's main controller NCE
After receiving the activation signal, a call test is performed. Then check the operating status of the system. (5) In a single system or multiple systems, in addition to monitoring the downlink signal of the control channel, the main controller NCE is activated to
Perform a calling test. On the test fixed station equipment TTR side,
It monitors whether a loop check signal is returned from the mobile terminal in the downlink signal from the base station, and if it is normal, calls again after a certain period of time T. At this time, in the case of multiple systems, if one system is normal, a call test is performed on the next system. If there is an abnormality, the calling cycle is changed to a cycle t shorter than the fixed cycle T and a calling test is performed quickly. When normality is restored, the calling test is performed periodically again at the fixed cycle T.

[0011]

As explained above, according to the control channel monitoring method of the present invention, the test fixed station device TTR constantly monitors the state of the downlink signal of the control channel of the system. When a problem occurs, a response request is quickly notified to the base station's main controller, so the base station's main controller automatically switches to an alternative control channel, minimizing system service degradation. is obtained.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram showing the basic configuration of a control channel monitoring method of a mobile communication system according to the present invention;

[Fig. 2] Block diagram of a simple mobile radio telephone system according to an embodiment of the present invention

[Figure 3] Block diagram of a conventional simple mobile radio telephone system monitoring system

[Explanation of symbols]

1 is an adapter unit of the test fixed station device TTR.

Claims (5)

[Claims] Claim 1: A radio device (T/R) in which each of a plurality of mobile terminals is controlled by a main controller (NCE) of a base station.
A communication system that uses a specific channel among multiple channels as a control channel, shares multiple communication channels, and makes calls to general terminals of a public communication network connected to an exchange (EX), and a wireless device of the base station that is separate from the Test fixed station equipment (TTR)
The radio equipment of the base station intercepts the radio waves of the control channel transmitted and received from the mobile terminal, monitors the interference to the control channel, and detects the occurrence of failure (AL) of each equipment (T/R, NCE).
M) In a monitoring method for a mobile communication system consisting of a system that monitors and tests M) using each monitoring control device (SV),
The test fixed station equipment (TTR) always monitors the state of the electric field in synchronization with the downlink signal from the base station to the mobile terminal on the control channel, and in the event of loss of synchronization or sudden electric field fluctuation, 1. A control channel monitoring method in mobile communications, characterized by having a function (1) of generating a control signal and notifying the main control device (NCE) through a supervisory control device (SV). 2. In the monitoring method for the mobile communication system, the test fixed station equipment (TTR) is provided with a transmission format of a downlink signal of a control channel representing a call originating from a mobile terminal and an incoming call to the mobile terminal. A function to constantly monitor (
12) A method for monitoring a control channel in mobile communication, characterized by providing the following. 3. In the mobile communication system monitoring method, the test fixed station equipment (TTR) is equipped with two radio equipment (TR1, TR) for monitoring a single system, a working radio equipment and a backup radio equipment.
2) are used independently, and the two radios are equipped with a function (13) to periodically receive the downlink signal of the control channel for each system for monitoring multiple systems. control channel monitoring method for mobile communications. 4. In the mobile communication system monitoring method, the test fixed station equipment (TTR) is made to make calls at regular intervals based on information from the base station main controller (NCE), and the mobile terminals of the system If a call link is not established, the function shortens the call cycle and performs a call test (1
4) A control channel monitoring method in mobile communication, characterized by providing the following. 5. In the mobile communication system monitoring method, the test fixed station equipment (TTR) constantly monitors downlink signals of control channels of a single system and multiple systems, and detects a failure (synchronization) in a certain system. 1. A method for monitoring a control channel in mobile communications, characterized in that a function (15) is provided for performing a calling test on a faulty system and monitoring its operating state only when a faulty system (disconnection and electric field fluctuation) occurs.