JP2007019704A - Radio base station apparatus and radio base station system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a radio base station apparatus which detects a failure of an antenna and a receiver by a code division multiple access (CDMA) system without causing call disconnection or communication quality deterioration.
Receiving signals from a plurality of antennas are amplified by low noise amplifiers 101, and the amplified receiving signals are converted into receiving baseband signals by a plurality of receivers 102, and converted by the respective receivers 102. From the received baseband signal, each of the plurality of path detection units 104 performs path detection at each antenna 100, the number of path detections by each path detection unit 104 is counted by the path detection number count unit 107, and the failure determination unit 108 Thus, a failure is determined when the difference between the maximum and the minimum number of path detections in each antenna 100 counted is outside the specified range.
[Selection] Figure 1

Description

  The present invention relates to a code division multiple access (CDMA) type radio base station apparatus and a radio base station system for detecting failure of an antenna and a radio.

In the radio base station of Patent Document 1, a radio base station device with a failure detection function and a mobile communication system using the same are disclosed. According to Patent Literature 1, a transmission signal whose power value is known in advance is temporarily tuned and received by the receiver of the base station apparatus of the mobile communication system, and the power value of the transmission signal input to the receiver The electric field value obtained by detecting the received electric field is compared, and if a predetermined upper limit or lower limit is exceeded, a failure is determined.
Patent Document 2 discloses a radio base station device with a failure detection function and a mobile communication system using the same. According to Patent Document 2, a downlink radio wave from an adjacent radio base station apparatus is received by an electric field monitoring receiver in the radio base station apparatus, and a failure of the receiver is detected.

JP 2002-246978 (pages 4-7, FIG. 1) JP-A-10-276127 (pages 3 to 5, FIG. 1)

In the thing of patent document 1, the circuit for detecting a failure is provided separately, and a new additional circuit is required. Moreover, the failure detection location is limited to the failure detection of the receiver, and there is a demerit such that the failure of the receiving antenna cannot be detected. Furthermore, although it is temporary when the test is performed, the reception signal to the receiver is switched from the signal obtained from the antenna to the test signal, so that the call is not disconnected but the communication quality is deteriorated. There's a problem.
Moreover, since the thing of patent document 2 needs to communicate between base station apparatuses in the case of a detection, a system becomes large-scale and the receiving part for electric field monitoring is needed separately.
In addition, when a failure is detected, there is a problem that one receiver is always occupied by the failure detection, and the number of users who can talk is reduced.

  An object of the present invention is to provide a radio base station apparatus and a radio base station system that detect failure of an antenna and a receiver in a code division multiple access (CDMA) system without causing call disconnection or communication quality degradation. I have to.

  In the radio base station apparatus according to the present invention, a plurality of antennas that receive radio signals, a plurality of path detection units that receive the received signals of the respective antennas and perform path detection in the respective antennas, and the respective path detection units A path detection frequency counting unit that counts the number of path detections in the antenna, and a failure determination unit that detects an antenna failure by comparing the path detection frequency in each antenna counted by the path detection frequency counting unit It is.

  As described above, the present invention includes a plurality of antennas that receive radio signals, a plurality of path detectors that receive signals received from the respective antennas and perform path detection in the respective antennas, and antennas that are formed by the respective path detectors. Since the path detection frequency count unit for counting the number of times of path detection in, and a failure determination unit for detecting the failure of the antenna by comparing the path detection frequency in each antenna counted by the path detection frequency count unit, Since the failure is detected based on the number of path detections, it is easy to implement in the radio base station device, and the failure detection is performed in the operational state, so there is no loss of operation, call disconnection or communication quality degradation. Antenna failure can be detected.

Embodiment 1 FIG.
The first embodiment will be described below with reference to FIGS.
1 is a block diagram showing a radio base station apparatus according to Embodiment 1 of the present invention.
In FIG. 1, a code division multiple access (CDMA) radio base station apparatus 109 includes an antenna 100 that receives radio signals and a low noise amplifier (hereinafter referred to as LNA) 101 that amplifies an input signal S100 from the antenna 100. A receiver 102 that receives the amplified received signal S101 as input and performs frequency conversion and conversion to a digital IQ signal; a baseband demodulator 103 that receives the received baseband signal S102 and performs baseband demodulation processing; A failure determination unit 108 is provided. Further, the antennas 100, the low noise amplifiers 101, and the receivers 102 are provided as many as the antennas 100. Note that the number of antennas 100 is two or more.

The baseband demodulator 103 has a received power equal to or higher than a set threshold, and a path detector 104 that selects a path having an effective SIR (Signal to Interference power Ratio); Each of the antennas 100 includes a Rake combining unit 105 that adds the signals S103 of each path and a demodulation processing unit 106 that demodulates the Rake combined signal S104. Further, a path detection signal counting unit 107 that counts the path detection signal S107 from the path detection unit 104 and stores the number of path detections in each antenna 100 is provided.
In the first embodiment, the failure determination unit 108 determines the failure of the antenna, the LNA, or the receiver using the number of path detections of each antenna.
FIG. 2 is a flowchart showing a failure determination operation of the radio base station apparatus according to Embodiment 1 of the present invention.

Next, the operation of the failure determination unit 108 will be described with reference to FIG.
The failure determination unit 108 prepares a timer that times out at a predetermined periodic interval. When the timer times out (step S1), the failure detection unit 108 calculates the number of path detections in each antenna 100 counted by the path detection number counting unit 107. Obtain (step S2). Further, the number of path detections at each antenna 100 is compared (step S3), and a ratio between the number of path detections of the antenna with the smallest number of path detections and the number of path detections of the antenna with the most number of path detections is determined in advance. It is determined whether it is within the specified range (step S4). As a result, if it is within the specified range, it waits for the fixed-cycle timer to time out again (step S1), and waits for the timer to time out (step S2). If it is outside the specified range, it is determined that the antenna, LNA, or receiver has failed (step S5).
As described above, the failure determination unit 108 determines the failure of the antenna 100, the LNA 101, or the receiver 102 using the number of path detections of each antenna 100.

According to Embodiment 1, since a failure is detected by the number of path detections, it is easy to mount on a radio base station apparatus.
In addition, since it is not necessary to mount a device for switching the input signal of the receiver from the input signal of the antenna to the test signal of the transmitter, this function can be mounted at low cost.
Further, since the failure detection is performed in the operation state, the failure of the antenna, the LNA, or the receiver can be detected without causing the operation stop, call disconnection, or communication quality deterioration.

Embodiment 2. FIG.
Next, Embodiment 2 will be described with reference to FIG.
FIG. 3 is a block diagram showing a radio base station system according to Embodiment 2 of the present invention.
3, reference numerals 100 to 107 and 109 are the same as those in FIG. A monitoring control device 110 is connected to the radio base station device 109.
FIG. 4 is a block diagram showing a monitoring control apparatus for a radio base station system according to Embodiment 2 of the present invention.
In FIG. 4, the monitoring control device 110 is processed by an interface 111 such as a LAN interface for communicating with the radio base station device 109, a CPU device 112, a memory 113 for storing path detection count information, and the CPU device 112. The display 114 is provided as a display means for displaying the result.
FIG. 5 is a diagram showing a display example of the number of path detections displayed by the monitoring control apparatus of the radio base station system according to Embodiment 2 of the present invention.
In FIG. 5, the number of path detections for the two antennas ANT1 and ANT2 is displayed.

In the second embodiment, the radio base station apparatus 109 reports the number of path detections in each antenna 100 to the monitoring control apparatus 110 at regular intervals.
In the monitoring control device 110, the CPU device 112 integrates the reported number of detected paths for a determined time, and displays the number of detected paths for each antenna as a graph for each determined time as shown in FIG. 5, for example. 114. The display may be a graph or a table. For example, according to FIG. 5, the number of path detections of the antenna ANT2 is extremely small after a certain time, and the number of path detections of the antenna ANT2 is extremely small compared to the number of path detections of the antenna ANT1. Therefore, the maintenance manager can detect that there is a suspicion of failure of the antenna ANT2.
As described above, the maintenance manager can detect the suspected failure of the antenna 100, the LNA 101, or the receiver 102 by analyzing the number of path detections reported to the monitoring control device 110.

  According to the second embodiment, the radio base station apparatus reports the number of path detections to the monitoring control apparatus at regular intervals, and the maintenance manager analyzes the number of path detections reported to the monitoring control apparatus, so that the antenna Alternatively, a failure of the LNA or receiver can be detected.

It is a block diagram which shows the radio base station apparatus by Embodiment 1 of this invention. It is a flowchart which shows the failure determination operation | movement of the radio base station apparatus by Embodiment 1 of this invention. It is a block diagram which shows the radio base station system by Embodiment 2 of this invention. It is a block diagram which shows the monitoring control apparatus of the radio base station system by Embodiment 2 of this invention. It is a figure which shows the example of a display of the frequency | count of a path | pass detection displayed with the monitoring control apparatus of the radio base station system by Embodiment 2 of this invention.

Explanation of symbols

100 antenna 101 LNA
DESCRIPTION OF SYMBOLS 102 Receiver 103 Baseband demodulation part 104 Path detection part 105 Rake combining part 106 Demodulation processing part 107 Path detection frequency count part 108 Failure judgment part 109 Radio base station apparatus 110 Monitoring and control apparatus 111 Interface 112 CPU apparatus 113 Memory 114 Display

Claims (4)

  A plurality of antennas that receive radio signals, a plurality of path detectors that receive signals received from the respective antennas and perform path detection at the respective antennas, and count the number of times of path detection at the respective antennas by the respective path detectors A radio base station comprising: a path detection frequency counting unit; and a failure determination unit that detects a failure of the antenna by comparing the path detection frequency of each antenna counted by the path detection frequency counting unit apparatus.   A plurality of antennas for receiving radio signals, a plurality of low noise amplifiers for amplifying the reception signals of the respective antennas, a plurality of receivers for converting the reception signals amplified by the low noise amplifiers to reception baseband signals, A reception baseband signal converted by each receiver is input, and a plurality of path detection units for performing path detection at each antenna, and the number of path detections for counting the number of path detections at each antenna by each path detection unit. A failure determination unit that detects a failure of the antenna or the low-noise amplifier or the receiver by comparing the number of path detections in each of the antennas counted by the path detection number counting unit; A wireless base station device characterized.   The failure determination unit has a timer that times out at regular intervals, and acquires the number of path detections at each antenna from the path detection number count unit each time the timer times out, and the number of path detections at each acquired antenna. The failure is detected by determining whether or not the ratio of the smallest number of path detections and the largest number of path detections is within a specified range. Wireless base station device.   A plurality of antennas that receive radio signals, a plurality of path detectors that receive the signals received by the respective antennas and perform path detection at the antennas, and a path that counts the number of times each path detector detects the path at each antenna. In the radio base station apparatus which has a detection frequency count unit and transmits the path detection frequency in each antenna counted by the path detection frequency count unit at a fixed period, and in each antenna transmitted from the radio base station device A monitoring control device is provided that receives the number of times of path detection, integrates the number of times of path detection in each of the antennas for a predetermined time if necessary, and displays the result on a display unit in a graph or a table. Wireless base station system.

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