JPH0722992A - Mobile communication base station device - Google Patents

Abstract

PURPOSE:To detect the deterioration of communication quality due to the leakage power, etc., of the adjacent channel of the frequency adjacent to the reception desired frequency by taking the ratio of the received electric field level information of at least two reception parts and comparing the value with a constant threshold value. CONSTITUTION:A discrimination part 5 lets two waves in the frequency relation adjacent each other which can be known from frequency designation information 4, for example, the adjacent wave for the reception desired wave of the frequency f0 be f'0 and f''0 among inputted N pieces of reception electric field level information 1C-NC. Where, f''0=f0$DELTAf;f''=f0+DELTAf:DELTAf is defined as a carrier interval. The ratio of the reception desired wave to the reception electric field level at respective reception electric field levels of the frequencies f'0 and f''0 are compared with a set constant threshold value. When the ratio exceeds the threshold value, the communication deterioration of the channel f0 due to the leakage power of the adjacent channels f'0 of f''0 is judged to be generated and to output the result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication base station apparatus, and more particularly to a mobile communication base station apparatus that enables communication by using at least two adjacent frequencies at the same time.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a configuration of a conventional example of a mobile communication base station apparatus.

As shown in the figure, in this conventional example, a receiving section 1B which receives a radio signal (hereinafter referred to as an RF signal) 1A as an input and outputs reception electric field level information 1C, and a reception electric field level which receives an RF signal 2A as an input. The receiver 2B that outputs the information 2C, the receiver NB that inputs the RF signal NA and outputs the received electric field level information NC, and the respective frequencies of the N receivers 1B to NB are designated. It has a frequency designating section 3 for outputting frequency designating signals 1D to ND and a receiving electric field monitoring section 7 for receiving received electric field level information 1C to NC. This reception electric field monitoring unit 7
The received electric field level of each of the received RF signals 1A to NA was monitored. For example, in the wireless communication channel switching method and system disclosed in Japanese Unexamined Patent Publication No. 1-198837, channel switching means for alternately switching between the first and second wireless channels of the mobile wireless device for transmission and reception and radio wave interference. Interference detection means. Now, when it is detected that the communication quality has deteriorated during communication with the wireless base station using the first wireless channel, the mobile wireless device sets the second wireless channel and issues an instruction for this setting. The gateway exchange that has received the data also transmits the communication signal being communicated on the first wireless channel to the second wireless channel. Then, a switching transmission / reception period in which the first and second radio channels are alternately switched by the channel switching means for communication is provided, and thereafter communication is continued only by the second radio channel. In this way, by temporarily transmitting and receiving the old channel and the control channel or the new channel in parallel, it is possible to avoid intermodulation due to channel switching and instantaneous interruption of communication.

[0004]

FIG. 2 exemplifies a reception electric field level curve of each RF signal in which carrier frequencies f ₀ ′, f ₀ and f ₀ ″ are adjacent to each other. In this case, assuming that three waves are simultaneously communicating, even if the desired wave (frequency f ₀ ) to be received by the local station is sufficiently high, the reception electric field level of the adjacent RF signal (frequency f ₀ ″) is still higher and the relative electric field level is relatively high. Since it is very high, the leaked power portion is superposed on the band of the desired reception wave of the own station, so that noise is generated (hatched portion in FIG. 2) and the communication quality is deteriorated.

However, in the above-mentioned conventional mobile communication base station apparatus, the electric field level information output from two or more receiving sections is monitored only by the absolute value of the electric field level monitoring section. The deterioration of communication quality cannot be detected, and in Japanese Patent Laid-Open No. 1-198837, the interference detector is operating a call, or monitors the absolute level of only the signal of the frequency to be switched and operated. Therefore, it is impossible to identify the deterioration of the communication quality due to the leakage power of the signal wave of the adjacent frequency.

It is an object of the present application to provide a mobile communication base station apparatus capable of communicating by using at least two radio signals of adjacent frequencies at the same time, by a signal of an adjacent frequency of a desired reception wave. It is an object of the present invention to provide a mobile communication base station device that detects communication quality deterioration and outputs a determination result.

[0007]

A mobile communication base station apparatus of the present invention receives frequency designation information output from a frequency designation section and reception electric field level information output from at least two reception sections, The reception electric field levels of two radio signals whose frequencies are adjacent to each other are compared, and the reception electric field level ratio between the signal wave of the adjacent frequency and the desired reception signal wave of the own station is equal to or higher than a preset threshold value. In this case, it has a determination unit which determines that the communication quality of the desired signal wave of the local station is deteriorated and outputs the determination result.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a mobile communication base station apparatus of the present invention, and FIG.
It is a figure which shows the relationship between the received electric field level of each RF signal, and the set threshold value.

The present embodiment has a judgment unit 5 instead of the reception electric field monitoring unit 7 of the conventional example shown in FIG. 2, and the judgment unit 5 outputs the reception electric field level information of each reception unit 1B to NB. 1C to NC and the frequency designation information 4 output from the frequency designation unit 3 indicating the receiving frequency of each of the receiving units 1B to NB are input to receive two waves having a frequency relationship adjacent to each other during reception. The electric field levels are compared, the deterioration of communication quality is judged, and the judgment result is output. All other configurations are the same as those of the conventional example described above.

Next, the determination operation performed by the determination unit 5 will be described.

The determination unit 5 receives the N received electric field levels that have been input.
It can be known from the frequency designation information 4 of the bell information 1C to NC.
Two waves that are adjacent to each other and have a frequency relationship, for example,
Frequency f₀ Adjacent frequency f to the desired reception wave of₀'
And f₀'' Wave (f₀'= F ₀ -Δf; f '' = f₀ + Δ
f: Δf is the carrier interval)
The ratio of the desired reception wave to the reception electric field level is set
This ratio compares the threshold to a certain threshold.
If it exceeds f₀ Channel is f₀'Or f ₀Next to ''
Communication quality is deteriorated due to the leakage power of the adjacent channel.
It is determined that they are the same, and the determination result is output.

FIG. 3 shows the relationship of deterioration of communication quality due to the wave of f ₀ ″ among the adjacent frequencies f ₀ ′ and f ₀ ″. Now, let A be the reception electric field level of the desired reception wave (frequency f ₀ ) and B be a constant threshold, and the adjacent frequency f ₀ '
Assuming that the received electric field level of the wave is C ₂ , their ratio (C
Since ₂ -A) is a C ₂ -A <B, the determining unit 5 determines that no cause communication degradation. Further, in the case of the wave of the adjacent frequency f ₀ ″, if the received electric field level is C ₁ , then C ₁ −A ≧ B, so that as shown by the hatched portion in FIG. It is determined that the communication quality has deteriorated due to.

The fixed threshold value B is set to the extent that the reception electric field level of the wave of the adjacent channel does not cause a call disturbance to the desired reception wave.

[0015]

As described above, according to the present invention, of the received electric field levels of at least two receiving units, the ratio of the received electric field level information of two waves having a frequency relationship adjacent to each other is obtained and is set as the value. By comparing with a fixed threshold value, the reception desired wave f ₀ has a wave f ₀ ′ or f ₀ ″ with an adjacent frequency.
There is an effect that it is possible to detect the deterioration of communication quality caused by the leaked power of the adjacent channel.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a mobile communication base station apparatus of the present invention.

FIG. 2 is a diagram showing electric field level curves of radio signals having adjacent frequency relationships.

FIG. 3 is an explanatory diagram of thresholds for determining communication quality deterioration due to radio signals of adjacent frequencies.

FIG. 4 is a block diagram showing a configuration of a conventional example of a mobile communication base station device.

[Explanation of symbols]

1A, 2A, NA Reception input terminal 1B, 2B, NB Reception section 1C, 2C, NC Reception electric field level information 1D, 2D, ND Frequency designation signal 3 Frequency designation section 4 Frequency designation information 5 Judgment section 6 Judgment result 7 Reception electric field monitoring Part A, C ₁ , C ₂ Received electric field level B Threshold f ₀ Frequency of desired reception wave of own station f ₀ ′, f ₀ ″ Frequency of adjacent wave

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 24, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

The present embodiment has a judging section 5 in place of the received electric field monitoring section 7 of the conventional example shown in FIG. 4 , and the judging section 5 outputs the respective received electric field level information output from each of the receiving sections 1B to NB. 1C to NC and the frequency designation information 4 output from the frequency designation unit 3 indicating the receiving frequency of each of the receiving units 1B to NB are input to receive two waves having a frequency relationship adjacent to each other during reception. The electric field levels are compared, the deterioration of communication quality is judged, and the judgment result is output. All other configurations are the same as those of the conventional example described above.

Claims (1)

[Claims] 1. At least two receiving sections for receiving a radio signal and outputting received electric field level information corresponding to the received electric field strength, and a frequency specifying section for specifying a frequency to be used for each receiving section. In a mobile communication base station apparatus having :, the frequency designating information output from the frequency designating unit and the received electric field level information output from the receiving unit are input, and two frequencies having frequencies adjacent to each other are input. If the reception electric field level ratio between the signal wave of the adjacent frequency and the reception desired signal wave of the local station is equal to or greater than a preset threshold value, the reception desired signal of the local station is compared. A mobile communication base station device, comprising: a determination unit that determines that the communication quality of waves is deteriorated and outputs a determination result.