JP3588282B2 - Adaptive array base station - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a base station provided with an adaptive array antenna, and to a method for detecting a failure of the adaptive array antenna.
[0002]
[Prior art]
In recent years, an adaptive array base station using an adaptive array antenna has been considered as a wireless base station of a mobile communication system such as a PHS or a mobile phone.
[0003]
FIG. 5 shows a conceptual diagram of the adaptive array base station.
[0004]
Reference numeral 2 denotes an adaptive array antenna, and reference numerals 9a, 9b, and 9c denote terminal-directional radio wave areas for the mobile terminals 10a, 10b, and 10c. Reference numeral 11 denotes an adaptive array base station.
[0005]
The adaptive array base station 11 having the adaptive array antenna 2 executes a procedure for establishing a wireless link when the mobile terminals 10a, 10b, and 10c transmit a request for establishing a wireless link using the control channel. However, at this time, a signal without noise or waveform distortion is obtained by directing the directivity of the radio wave area toward the mobile terminals 10a, 10b, and 10c.
[0006]
However, the problem with the current adaptive array base station is that there is no established means for detecting when a failure occurs in the adaptive array antenna and directivity can no longer be directed. have.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and has as its object to provide a function of detecting a failure of an adaptive array antenna.
[0008]
[Means for Solving the Problems]
According to the present invention, in a base station having an adaptive array antenna, a peripheral base station searching means for searching for a peripheral base station, and a position direction based on a signal level from the peripheral base station searched by the searching means. Detecting means for detecting, storing means for storing position and direction data of base stations present in the vicinity, and comparing means for comparing position and direction data detected by the detecting means with position and direction data stored in the storage means. And detecting whether or not a failure has occurred in the adaptive array antenna based on the result of the comparing means.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0010]
FIG. 1 shows that the adaptive array base station 1 determines a frame timing at which a control signal transmitted from the peripheral base stations 4a, 4b, 4c, and 4d can be monitored by monitoring on a control channel. FIG. 9 is a conceptual diagram when acquiring a directivity pattern that maximizes a control signal level by changing reception directivity at a determined frame timing after acquiring CS-IDs of 4b, 4c, and 4d.
[0011]
FIG. 2 is a functional block diagram of the adaptive array base station 1. The adaptive array base station 1 includes: an adaptive array antenna 2; a peripheral base station search unit 5 that searches for base stations existing in the vicinity based on a signal received from the antenna; In the peripheral base station searching unit 5, a position direction detecting unit 6 for detecting a position direction of the searched peripheral base station, and a CS-ID and a position of a base station existing in the vicinity, which are received in advance from a network center of a communication carrier or the like. A position / direction storage unit 7 for storing direction data, and a position / direction comparison unit 8 for comparing the detection result of the position / direction detection unit 6 with the position / direction data stored in the position / direction storage unit 7 are provided.
[0012]
FIG. 3 is a flowchart illustrating a process when an abnormality is detected in the adaptive array antenna.
[0013]
When diagnosing whether or not an antenna abnormality has occurred in the adaptive array base station 1, the adaptive array base station 1 communicates in advance with a network center or the like of a communication carrier so that the peripheral base station 4a, The CS-ID of 4b, 4c, and 4d and the position / direction data are acquired, and are stored in the position / direction storage unit 7 (S1). FIG. 4 is an example of the position and direction data stored in the position and direction storage unit 7. The CS-ID of the peripheral base station is shown in the row direction, and the number of each antenna is shown in the column direction.
[0014]
Adaptive array base station 1 monitors peripheral base stations 4a, 4b, 4c, and 4d by monitoring signals on a control channel on which peripheral base stations 4a, 4b, 4c, and 4d constantly perform intermittent transmission. Search for existence.
[0015]
When the synchronization of the frame timing is not established between the adaptive array base station 1 and the peripheral base stations 4a, 4b, 4c, and 4d, the adaptive array base station 1 includes the signals that can be received at the initial frame timing. , And confirm whether or not the CS-IDs of the peripheral base stations 4a, 4b, 4c, and 4d acquired in S1 are included (S3). Further, when the adaptive array base station 1 correctly receives any CS-ID among the peripheral base stations 4a, 4b, 4c, and 4d, the reception level of the control signal transmitted from the corresponding peripheral base station becomes the maximum. Then, by detecting the directivity pattern, the position direction data of the corresponding peripheral base station is obtained (S4).
[0016]
Based on the acquired CS-ID, the position / direction data stored in the position / direction storage unit 7 is searched, and the relevant data is compared with the position / direction data acquired in S4 by the position / direction comparison unit 8 ( S5). For example, if the data stored in the position and direction storage unit 7 is Pa1 with respect to the position and direction data of antenna # 1 of the peripheral base station 4a (see FIG. 4), the data detected by the position and direction detection unit 6 , Pa1 or within an expected error range, it is determined that there is no abnormality. If the error exceeds the expected error range, it is determined that there is an abnormality. The same determination is made for each data of antennas # 2, # 3, and # 4. In these determination processes, if at least one of the data on all the antennas is determined to be abnormal, it is determined that the antenna is abnormal.
[0017]
After the search is performed at the initial frame timing, the frame timing is shifted by a predetermined interval (S6), and at that frame timing, it is searched whether there is a peripheral base station that can receive the CS-ID. When the operations of S3 to S6 are performed at all frame timings (S2), the operation of the antenna abnormality detection ends, and it is determined that there is no antenna abnormality.
[0018]
When frame timing synchronization is established between the adaptive array base station 1 and the peripheral base stations 4a, 4b, 4c, and 4d, the adaptive array base station 1 searches for a receivable signal at an initial frame timing. , And the operations of S4 to S5 are repeated for the neighboring base station corresponding to the received CS-ID. The operation of shifting the frame timing (S6) and the determination of whether or not the search of all frame timings has been completed (S2) are not performed.
[0019]
In the antenna abnormality detection operation, when it is determined that there is an antenna abnormality, the information is transmitted to the outside by an output signal, and a request is made to stop the operation of the adaptive array PHS base station 1 or the adaptive array PHS base station 1 The operation such as autonomously stopping the operation is performed.
[0020]
【The invention's effect】
As described above, according to the present invention, in a base station having an adaptive array antenna, it is possible to detect the occurrence of a failure by using the directivity of the adaptive array antenna.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram when an adaptive array antenna abnormality is detected.
FIG. 2 is a functional block diagram of an adaptive array PHS base station according to the present embodiment.
FIG. 3 is a flowchart showing a process when detecting an abnormality in an adaptive array antenna.
FIG. 4 is a table showing positional direction data of the present embodiment.
FIG. 5 is a conceptual diagram of an adaptive array base station.
[Explanation of symbols]
1 Adaptive Array Base Station 2 Adaptive Array Antennas 3a, 3b, 3c, 3d Peripheral Base Station Directional Radio Areas 4a, 4b, 4c, 4d Peripheral Base Station 5 Peripheral Base Station Search Unit 6 Position Direction Detector 7 Position Direction Storage Unit 8 Position / direction comparison units 9a, 9b, 9c Terminal direction directivity radio areas 10a, 10b, 10c Mobile terminal 11 Adaptive array base station

Claims (1)

In a base station equipped with an adaptive array antenna,
Peripheral base station search means for searching for a nearby base station;
Detecting means for detecting a position direction based on a signal level from a peripheral base station searched by the searching means;
Storage means for storing position direction data of base stations existing in the vicinity,
Comparing means for comparing the position and direction data detected by the detection means with the position and direction data stored in the storage means,
An adaptive array base station for detecting whether or not a failure has occurred in an adaptive array antenna based on a result of the comparing means.

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