JPH10285103A - Method for detecting interference of free radio channel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it a turning point to start a radio channel change processing with real interference which is continuously or intermittently generated by recognizing the occurrence of radio channel interference by generating interference exceeding a free radio channel interference detection level for a free radio channel interference monitoring coefficient. SOLUTION: Free radio channel interference information received by the free radio channel interference information reception part 911 of a central control unit 9 is temporarily preserved in a storage device. A free radio channel interference detection part 912 periodically reads it and counts up the number of idle radio channel interference times when radio channel interference wave radio wave power is judged to exceed the preset free radio channel interference detection level. When the number of times becomes not less than the interference monitoring coefficient, it is reported to a radio channel interference times management part 921 and a radio channel processing part 422 is started. Thus, the number of the change times of a radio channel is reduced and the stability of the radio channels of respective cells through a system is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio channel allocation method for a mobile communication system, and more particularly to a method of detecting an idle radio channel interference when true radio channel interference is detected by the continuity of the idle radio channel interference detection. .

[0001]

2. Description of the Related Art Conventionally, mobile communication systems have been disclosed in
When an interfering wave power exceeding a predetermined threshold value is received by a transceiver as described in -33033, it is recognized that idle radio channel interference has occurred even if it is instantaneous. doing.

[0002]

The first problem is that it is immediately recognized that radio channel interference has occurred just because the transceiver receives interference wave power exceeding a threshold value. It is in.

[0003] The reason is that, when it is determined that radio channel interference is caused by interference wave power exceeding a threshold value instantaneously received by a transceiver, interference caused by allocating the same radio channel to different transceivers. However, it cannot be determined whether the interference is temporarily caused by some factor.

[0004] If the interference occurs temporarily for some reason, it is considered that the interference will no longer occur, and the quality of the radio channel cannot be deemed to be generally poor.
In addition, the degree to which the radio channel interference affects the radio channel, that is, whether the interference time is long or short, or whether the number of times of occurrence of the interference is large or small, is immediately determined without considering the radio channel. This is because when the change is made, it is easy to fall into a situation where the wireless channel is constantly changed, and the wireless channel becomes difficult to stabilize.

SUMMARY OF THE INVENTION It is an object of the present invention to detect a continuous or intermittent idle radio channel interference generated when the same radio channel is allocated to different transceivers as true interference. An object of the present invention is to provide a wireless channel interference detection method.

[0006]

An idle radio channel interference detection method according to the present invention uses an idle radio channel interference detection level and an idle radio channel interference monitoring coefficient when interference is detected on an idle radio channel. Means for counting up the number of times of radio channel interference.

[0007] The idle radio channel interference is periodically monitored, and it is recognized that the radio channel interference has occurred when the interference exceeding the idle radio channel interference detection level has occurred for the idle radio channel interference monitoring coefficient. It can be a trigger to start the wireless channel change process due to the intermittent true interference. As a result, the radio channel is not easily changed, and the stability of the radio channel used in each cell is increased.

[0008]

Next, the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1 showing an embodiment of the present invention, a system for applying a radio channel changing method in mobile communication includes mobile terminals 10 scattered in a radio zone.
And a radio base station connected to the mobile terminal 10 by a radio line, transmitting and receiving signals using TDMA (time division multiple access) 3 channels / carrier as an access method, and monitoring line quality for radio line switching. Bureau 20,
A base station controller 30 for setting and switching of a wireless channel, remote monitoring and control of the wireless base station 20, and monitoring and controlling the wireless channel; and the mobile terminal 10 and the public through the wireless base station 20 and the base station controller 30. It comprises a mobile telephone exchange 40 for connecting subscribers (not shown) of the network or mobile terminals.

The radio base station 20 includes an antenna 1, a plurality of transceivers 21 to 2 n from # 1 to #N connected to the antenna 1 for each sector, and an interface for connecting to the base station controller 30. The base station controller 30 includes a circuit 3 and a control unit 4 for controlling the transceiver and the interface circuit. The base station controller 30 includes an interface circuit 5 for connecting to the radio base station 20 and the mobile telephone exchange 40, respectively.
6, a speech path switch 7 for accommodating these interface circuits and forming a speech path, and interface circuits 5, 6
A central control device 9 for controlling the communication path switch 7; and a storage device 8 on which data is written and read by the central control device.

FIG. 2 shows a control unit 4 of the radio base station in FIG.
FIG. 3 is a block diagram showing details of a central control unit 9 of the base station controller and an idle radio channel interference monitoring unit 41 for monitoring interference of a radio channel in use. The idle wireless channel interference monitoring unit 41 includes a wireless channel interference measurement execution unit 411 that periodically performs interference measurement on an idle wireless channel, a wireless channel interference measurement result receiving unit 412 that receives interference measurement results, and A radio channel interference information transmitting unit 413 for transmitting radio channel interference result information to the base station controller 30; The central controller 9 receives the idle radio channel interference information from the radio base station 20 and performs an idle detection process. The idle radio channel interference detection unit 91 manages the occurrence of the radio channel interference by the number of times and controls the radio channel change process. And a wireless channel change control unit 92 that performs the operation. The idle radio channel interference detection unit 91 and the idle radio channel interference information receiving unit 911 for receiving the idle radio channel interference information detect interference exceeding a certain level from the radio channel interference information, and the radio channel interference occurs continuously. And an idle radio channel interference detecting unit 912 for confirming that the wireless channel is in the idle state. Wireless channel change control unit 9
Reference numeral 2 denotes a wireless channel interference frequency management unit 921 that counts up the number of wireless channel interference based on the result of the idle wireless channel interference detection reported from the idle wireless channel interference detection unit 91 and stores the number of wireless channel interference in system data. And a wireless channel changing unit 922 for changing a wireless channel.

Next, the operation of this embodiment will be described with reference to FIGS. 3 to 5 showing the procedure of an idle radio channel interference detection method according to an embodiment of the present invention and FIGS.

The wireless channel interference measurement execution unit 411 of the idle wireless channel interference monitoring unit 41 of the wireless base station 20 executes wireless channel interference measurement on the transceiver (step 1: S1), and the wireless communication is performed by the transceiver. When the channel interference measurement result is received by the wireless channel interference measurement result receiving section 412, it is transmitted from the wireless channel interference information transmitting section 413 to the central controller 9 of the base station controller 30 (S2).

The idle wireless channel interference information received (S3) by the idle wireless channel interference information receiving section 911 of the central controller 9 is temporarily stored in the storage device 8 (S3).
4). The idle radio channel interference detection unit 912 periodically reads out the idle radio channel interference information (S5). When it is determined that the radio channel interference wave radio power exceeds a preset idle radio channel interference detection level ( S
6) shows the number of idle radio channel interference (hereinafter referred to as counter A
Is counted up (S7). When the counter A does not exceed the idle radio channel interference detection level in determining the idle radio channel interference in a cycle, it is cleared to 0 (S8) and counts up until the idle radio channel interference is detected again. Not done. Counter A
Are continuously counted up and become equal to or larger than the idle radio channel interference monitoring coefficient (S9), the frequency is reported to the radio channel interference frequency management section 921, and the radio channel interference frequency (hereinafter referred to as a counter B) is incremented (S10). Then, the radio channel change processing unit 422 is activated (S11), and the counter A is cleared to 0 (S12). Counter B
Counts up not only when the idle wireless channel interference is detected but also when the busy wireless channel interference is detected. Further, the idle radio channel interference detection processing is performed for the maximum number of transceivers mounted (S13).

In FIG. 5, based on the above operation, the idle radio channel interference detection cycle is 1 minute, the idle radio channel interference radio power is six levels from 0 to 5, and the idle radio channel detection level is 3 levels. This shows the count-up timing of the counter A and the counter B when the idle radio channel interference monitoring coefficient is set to twice. At the time I, the counter A and the counter B do not count up because the idle wireless channel interference level does not exceed the idle wireless channel interference detection level. At the time of J, the idle radio channel interference level has exceeded the idle radio channel interference detection level, so the counter A counts up for the first time, but only once has exceeded the idle radio channel interference detection level and is idle. Since the medium radio channel interference monitoring coefficient has not reached two times, the counter B does not count up. At the time of K, the counter A is cleared to 0 because the threshold value does not exceed the idle radio channel interference detection threshold. At the time of L, the same processing as that of I is performed. As a result of counting up the counter A at the time of M, the number of the idle radio channel interference monitoring coefficients has reached two times, so the counter B counts up. The counter A is cleared to 0 after the counter B counts up.
At the time of N, the same processing as J is performed. At the time of O, the same processing as that of K is performed.

[0016]

The first effect is that the number of times of changing the radio channel is reduced as much as possible and the stability of the radio channel of each cell through the system can be secured.

The reason is that, in order to avoid unnecessarily degrading the quality of the wireless channel, the instantaneously occurring idle wireless channel interference is not regarded as interference, and the continuous or intermittent occurrence of the wireless channel interference is truly considered. This is because it is interference.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system to which a radio channel changing method in mobile communication according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing some of the components of FIG. 1;

FIG. 3 is a flowchart showing a procedure of receiving idle radio channel interference information in mobile communication according to one embodiment of the present invention.

FIG. 4 is a flowchart showing a procedure of detecting an idle radio channel interference in mobile communication according to one embodiment of the present invention.

FIG. 5 is a diagram illustrating an example of detection of an idle radio channel interference in this embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 3,5,6 Interface circuit 4 Control part 7 Communication path switch 8 Storage device 9 Central control device 10 Mobile terminal 20 Radio base station 21-2n # 1 transceiver #N transceiver #Base station controller 40 Automobile Telephone exchange 41 Free radio channel interference monitoring unit 91 Free radio channel interference detection unit 92 Radio channel interference monitoring unit 411 Radio channel interference measurement execution unit 412 Radio channel interference measurement result reception unit 413 Radio channel interference information transmission unit 911 Radio channel Interference information receiver 912 Wireless channel interference detector 921 Wireless channel interference frequency manager

Claims (5)

[Claims] 1. A wireless channel allocation method in a mobile communication system, comprising: B) In the autonomous distributed dynamic channel allocation method for the purpose of improving frequency utilization efficiency and reducing the burden of radio channel allocation design work, periodically monitor the level of free radio channel interference waves received by each radio transceiver. I do. B) It has an idle wireless channel interference detection level for detecting idle wireless channel interference occurrence in advance. C) It has an idle wireless channel interference monitoring coefficient for checking the idle wireless channel interference continuity in advance. D) When the idle radio channel interference is detected, it is stored in the memory of the base station control device as the idle radio channel interference frequency. 2. The radio channel allocation method according to claim 1, further comprising: “measurement unit for measuring the radio channel interference during the free time” when detecting the radio channel interference during the free time. 3. The radio channel assignment method according to claim 1, wherein the number of idle radio channel interferences is counted up only when the idle radio channel interference occurs continuously. 4. The wireless channel allocation method according to claim 1, wherein said idle radio channel interference detection level can be set to six levels from 0 to 5. 5. The vacant radio channel monitoring coefficient is 1 to 5.
2. The radio channel allocation method in a mobile communication system according to claim 1, wherein the setting can be made between 255.