CN101426219B - Detection method for TD-SCDMA multichannel radio frequency remote unit antenna system - Google Patents

Abstract

The present invention provides a method for testing TD-SCDMA multi-channel radio remote unit antenna system. Each gateway of original radio remote signal receiving-transmitting channel system is respectively provided with a power detecting and processing unit and a detecting channel of frontward and backward power testing circuit connected with the power detecting and processing unit. The method according to the invention comprises the following steps: 1) transmitting a signal by a main control unit to each receiving-transmitting channel according to a certain power, detecting the transmitting and reflecting signal powers of each radio remote unit antenna opening by the frontward and backward power detecting circuit of each gateway, calculating the difference between the frontward detected power and the backward detected power and comparing the difference with a preset threshold, and detecting whether the antenna of each channel is failed; 2) transmitting a certain power signal by an adjusting channel for being received by other gateway, comparing the receiving level with the preset threshold for detecting whether the connected antenna is an intelligent antenna and whether the connected antenna is in fault; and 3) transmitting a certain power signal by a transmitting channel wherein for being received by the other channels, and comparing the receiving level of each channel with the preset threshold for determining whether the antenna connected with the transmitting channel is an intelligent antenna and/or whether the antenna is in fault.

Description

Detection method for TD-SCDMA multi-channel remote radio unit antenna system

technical field

The invention relates to an antenna detection method for a TD-SCDMA multi-channel remote radio unit, in particular to a method for detecting the type of antenna connected to the TD-SCDMA multi-channel remote radio unit and whether it is faulty.

Background technique

With the development of TD-SCDMA network construction, the number of users will gradually increase, and operators will have higher and higher requirements for capacity and coverage. However, in actual work, it is not easy to choose the site of the base station. Sometimes it is impossible to arrange the equipment room or the location of the equipment room is not ideal, which has become one of the difficulties in network construction. In addition, because base station costs account for a large proportion of TD-SCDMA network investment, and the distribution of traffic in some regions and time periods is unbalanced, the number of base stations will also increase, resulting in waste of resources. Therefore, choosing a base station that can reduce network construction costs and maintain network quality is the key to constructing a TD-SCDMA network.

On the other hand, TD-SCDMA's strong support for data services has rapidly increased the proportion of indoor services in the entire network. Therefore, quickly and economically building indoor distribution systems in important buildings has become a very practical issue for TD-SCDMA operators to attract users and make quick profits.

The proposed distributed network coverage scheme effectively solves the above problems. For distributed network coverage, base stations are centrally placed in the available central computer room, the baseband part is processed centrally, and the radio frequency module is pulled to the remote radio frequency unit by optical fiber, which is distributed at the site determined by the network planning, thus saving conventional solutions A large number of computer rooms are required. At the same time, the multi-channel remote radio unit successfully solves indoor coverage.

Therefore, the TD-SCDMA radio remote unit not only needs to support smart antennas, but also needs to support distributed antennas, which can be flexibly configured according to network deployment conditions. However, in actual work, due to the long distance between the base station and the RF front-end, it is difficult to accurately know whether the antenna connected to the remote radio unit is a smart antenna or a distributed antenna. It is easy to make mistakes when configuring antennas and establishing cells, which will affect the entire network. performance.

Contents of the invention

In view of this, the present invention will provide a method for detecting the antenna of the TD-SCDMA multi-channel remote radio unit, especially for detecting the type of antenna connected to the TD-SCDMA multi-channel remote radio unit and whether it is faulty Methods.

The invention is used for the detection method of the TD-SCDMA multi-channel radio remote unit antenna system, which is in the radio remote signal transceiving channel system with multiple transceiver channels and calibration channels connected to the remote smart antenna and distributed antenna In each path, a power detection processing unit controlled by the main control unit and a detection channel including a forward power detection circuit and a reverse power detection circuit connected thereto are provided in parallel with the transceiver channel and the calibration channel, And detect and judge in the following way:

1'The main control unit controls the transmission channels of the multi-channel system to transmit signals at a certain power, and the forward power detection and reverse power detection circuits of each channel detect the transmitted signal power and reflected signal power of the antenna port of each radio remote unit , calculate the detected forward and reverse power difference, and compare it with the preset threshold value, if the difference is greater than the threshold value, it is judged that the antenna is faulty; if the difference is smaller than the threshold value, there is no fault . According to the actual testing purpose or needs, the testing can be terminated, or the following testing can be continued;

2'The calibration channel of the radio remote unit transmits a signal with a certain power, and other channels receive it, and compares the level received by each channel with the preset threshold value. If the receiving level of each receiving channel exceeds the preset threshold value threshold value, and the difference between the receiving levels of each channel is less than the preset threshold value, it is judged that the current connection is a smart antenna, and the antenna is normal; if the receiving level of some receiving channels is lower than the preset threshold If the receiving level of some receiving channels is higher than the set threshold, it is judged that the connected antenna is a smart antenna, and the antenna is faulty; if the receiving level of each receiving channel is lower than the preset threshold, continue as follows detection;

3' A signal with a certain power is transmitted by one of the transmission channels, and the other channels receive it. If the receiving level of the other channels exceeds the preset threshold value, it is judged that the antenna connected to the transmission channel is a smart antenna, and the antenna is faulty; if If the receiving levels of the remaining channels are lower than the preset threshold, it is judged that the antenna connected to the transmitting channel is a distributed antenna, and the detection ends.

The multi-channel transceiver channel is used to receive and transmit signals; the calibration channel is used to calibrate each channel. These are the inherent channels in the current multi-channel remote radio system, and the remote antenna can be used by External distributed antenna or array antenna and other components. The forward power detection circuit and the reverse power detection circuit arranged in each path are used to detect the power of the transmission path and the power of the reflected signal, and calculate the detected transmission power and the power of the reflected signal to calculate the power of the antenna. The standing wave ratio of the mouth is provided to the main control unit for comparison with the preset threshold value and judgment of the detection result.

In the forward power detection circuit and reverse power detection circuit of each path above, it is advisable to time-division multiplex the same detection path for forward power detection and reverse power detection, so as to avoid the forward/reverse detection caused by channel inconsistency. The error of the power difference in the direction.

In the above detection process, in order to strengthen prompts and attract sufficient attention when it is judged to be a fault, it can also send corresponding alarm signals such as sound/light at the same time. This is a conventional technology that has been widely used at present.

When realizing the above-mentioned detection method, the forward power detection circuit and the reverse power detection circuit connected to the power detection processing unit in the detection channel can respectively adopt the transmission channel corresponding to the transmitting channel in the transmitting and receiving channel of each corresponding path. The coupled forward coupling circuit and the reverse coupling circuit coupled with the receiving channel, and the forward coupling circuit and the power detection processing unit, the reverse coupling circuit and the antenna unit are respectively connected to the switch structure controlled by the main control unit, The main control unit transmits the signal of the forward coupling circuit or the reverse coupling circuit to the power detection unit in time division through the switch structure in the same detection channel. Said forward coupling circuit and reverse coupling circuit can be respectively implemented by means of couplers or radio frequency coupling lines commonly used at present.

In the above detection method, the main control unit is the control center of the entire radio remote unit. After receiving the antenna detection command, the antenna detection command can be initiated by the signal processing unit (BBU) of the indoor base station, or can be It is initiated regularly by the remote radio unit (RRU), and the antenna detection process is started by the main control unit. During the detection process, the power detection processing unit can convert the radio frequency signal of each coupling circuit into a quantifiable level signal and transmit it to the main control unit, and the main control unit performs the above standing wave ratio comparison and judgment to complete the Detection and judgment of relevant antenna type (smart antenna or distributed antenna) and/or whether there is a fault, etc. The said power detection processing unit can be realized by adopting an existing radio frequency detector or a digital signal processor equipped with a digital-to-analog transponder.

The antenna detection method of the above-mentioned TD-SCDMA multi-channel radio frequency remote unit of the present invention starts from the coupling relationship between the smart antenna and the distributed antenna, by judging and measuring the power difference between the transmitted and reflected signals of each antenna and judging the difference between the antennas. The degree of mutual coupling, so as to realize the judgment and/or detection of whether the connected antenna in the system is faulty and/or the type of the connected antenna. In the system setting, the multi-channel transceiver channel and calibration channel inherent in the current multi-channel system are fully utilized, which can be completed without adding additional hardware, and the above-mentioned detection method is accurate in measurement and simple in operation.

The above content of the present invention will be further described in detail below in conjunction with the specific implementation manners of the embodiments shown in the accompanying drawings. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following examples. Without departing from the above-mentioned technical idea of the present invention, various replacements or changes made according to common technical knowledge and customary means in this field shall be included in the scope of the present invention.

Description of drawings

Fig. 1 is a schematic diagram of the system and peripheral interface settings of the detection method of the present invention.

Fig. 2 is a schematic diagram of the forward and reverse power detection structure and working principle in the detection method of the present invention.

Fig. 3 is a detection processing flowchart of the detection method of the present invention.

Detailed ways

Fig. 1 is the setting form of the system and the peripheral interface of the detection method of the present invention, including: the main control unit used to control the work of the whole radio frequency remote unit and the antenna detection, respectively connected with the main control unit for wireless radio frequency signal transmission and reception The remote ends of multi-channel transceiver channels and calibration channels used for multi-antenna calibration are respectively connected to antennas, including smart antennas in the form of distributed antennas and array antennas. In each transceiver path, a power detection processing unit controlled by the main control unit and a detection channel including a forward power detection circuit and a reverse power detection circuit connected thereto are provided in parallel with the transceiver channel and the calibration channel .

FIG. 2 shows the structure and working principle of the forward power detection circuit and the reverse power detection circuit of the detection channel. A power detection processing unit 1 that uses a radio frequency detector or a digital-to-analog transponder plus a digital signal processor is respectively connected to the forward coupling circuit 4 coupled to the transmitting channel 3 and the reverse coupling circuit coupled to the receiving channel 8 via a switch structure 2 The circuit 7 is connected, the transmitting channel 3 and the receiving channel 8 respectively transmit and receive radio frequency signals through the radio frequency antenna 5 , and the reverse coupling circuit 7 and the receiving channel 8 are respectively connected to the radio frequency antenna 5 through the switch structure 6 . Both the forward coupling circuit 4 and the reverse coupling circuit 7 can be implemented by existing couplers or radio frequency coupling lines. The switch structure 2, 6 transmits the forward coupling or reverse coupling signal to the power detection unit 1 in time division under the control of the main control unit, which converts the radio frequency signal into a quantifiable level signal, and then transmits the signal to the The main control unit is used for detection and judgment by the main control unit.

Fig. 3 is a processing flow for detecting the antenna system of the TD-SCDMA multi-channel radio remote unit by adopting the above-mentioned method of the present invention. After the main control unit receives the antenna detection command (the detection command can be initiated by the BBU or periodically by the remote radio unit), it will start the antenna detection process.

The process of signal transmission and forward/reverse power detection is as follows: first, the main control unit sets a selected transceiver channel to transmit mode, and sends a signal to the transceiver channel, and at the same time sets the switch on the power detection circuit, time-sharing the forward The forward power detection signal and the reverse power detection signal are transmitted to the power detection processing unit, and the power detection processing unit processes the radio frequency signal into a quantifiable signal and then transmits it to the main control unit.

The signal receiving process is as follows: first, the main control unit sets the transceiver channel to receive mode, and the channel processes the signal received from the antenna port and converts it into a quantifiable signal and transmits it to the main control unit.

A specific detection process and steps can be as follows:

In the first step, each transmit channel of the multi-channel remote radio unit transmits signals according to a certain power, and the forward and reverse power detection circuits of each channel detect the transmit signal power and reflected signal power of each antenna port;

The second step is to calculate the detected forward and reverse power difference and compare it with the threshold. If the difference is greater than the threshold, it is judged that the antenna is faulty and an alarm is given;

In the third step, if the difference in the second step is less than the threshold value, the calibration channel of the remote unit transmits a signal with a certain power, and other channels perform receiving processing;

The fourth step is to compare the received level of each channel with the threshold. If they all exceed the set threshold, and the difference between the received levels of each channel is less than the set threshold, it is judged that the current connection is a smart antenna, and the antenna is normal;

In the fifth step, if the receiving level of each receiving channel in the third step is lower than the set threshold, set one of the transmitting channels to transmit a signal of a certain power, and the remaining channels receive;

Step 6: If the receiving level of other receiving channels exceeds the set threshold, it will be judged that the antenna connected to the RRU is a smart antenna, and the antenna is faulty, and an alarm will be issued; if the receiving level of the remaining channels is lower than the set threshold, it will be judged The antenna connected to the RRU is a distributed antenna.

In the seventh step, if the receiving level of some of the receiving channels in the third step is lower than the set threshold, and some are higher than the set threshold, it is judged that the antenna connected to the RRU is a smart antenna, and the antenna is faulty, and an alarm is issued.

The processing flow of the above antenna detection algorithm is as follows:

1. The main control unit separately controls each transceiver channel to send a certain power signal, and at the same time detects the forward power P _fk and the reverse power P _bk , if it satisfies:

P _bk -P _fk <Th _bf (k=1, 2, ..., N) 1.1

Then all the antennas are well connected to the channels, if not, the antennas are faulty. In the formula, P _fk is the forward detection power of the k-th channel, P _bk is the reverse detection power of the k-th channel, and Th _bf is the judgment threshold of the forward and reverse power.

2. If formula 1.1 is satisfied, the main control unit controls the calibration channel to transmit signals, and the transceiver channel to receive signals. Each transceiver channel receives the signal transmitted by the calibration channel, if the received signal power P _crk of each receiving channel satisfies:

P _crk >Th _cr (k=1, 2,..., N) 1.2

|P _crk -P _cri |<Th _rrc (k=1, 2,..., N; i=1, 2,..., N) 1.3

Then it is determined that the connected antenna is a smart antenna, and the antenna is not faulty. In the formula, P _crk is the power of the calibration signal received by the k-th receiving channel, P _cri is the power of the calibration signal received by the i-th receiving channel, Th _cr is the power judgment threshold of the received calibration signal, and Th _rrc is the power received by different receiving channels The judgment threshold of the power difference of the calibration signal.

3. If some of the k values do not satisfy the formula 1.2, it is determined that the connected antenna is a smart antenna, and the antenna is faulty.

4. If all k values do not satisfy the formula 1.2, then the main control unit controls one of the transceiver channels to transmit signals. Without loss of generality, the first channel is set to transmit signals, and the other transceiver channels receive the signals transmitted by the transmit channel. If each The signal power P _rrk received by the receiving channel satisfies:

P _rrk <Th _rr (k=2,3,...,N) 1.4

Then it is determined that the connected antenna is a distributed antenna, and the antenna is not faulty. In the formula, P _rrk is the signal power received by the kth receiving channel and transmitted by the transmitting channel, and Th _rr is the judgment threshold for receiving the signal power transmitted by the transmitting channel by the receiving channel

5. If part of the k values do not satisfy formula 1.4, it is determined that the connected antenna is a smart antenna and the antenna is faulty.

Claims (7)

1. The detection method of the TD-SCDMA multi-channel radio remote unit antenna system is characterized in that it has multiple transceiver channels and calibration channels connected to the far-end smart antenna or distributed antenna radio remote signal transceiver channel system In each path, a power detection processing unit controlled by the main control unit and a forward power detection circuit and a reverse power detection circuit connected to the power detection processing unit are provided in parallel with the transceiver channel and the calibration channel. detection channel, and conduct detection and judgment in the following manner: 1' The main control unit controls the transmit channel in the radio remote unit of the multi-channel system to transmit signals at a certain power, and the forward power detection and reverse power detection circuits of each channel detect the transmit signals of the antenna ports of each radio remote unit Power and reflected signal power, calculate the detected forward and reverse power difference, and compare with the preset threshold value, if the difference is greater than the threshold value, it is judged that the antenna is faulty; if the difference is less than the threshold value, then terminate the test, or continue the following test; 2'The calibration channel of the radio remote unit transmits a signal with a certain power, and other channels receive it, and compares the level received by each channel with the preset threshold value. If the receiving level of each receiving channel exceeds the preset threshold value threshold value, and the difference between the receiving levels of each channel is less than the preset threshold value, it is judged that the current connection is a smart antenna, and the antenna is normal; if the receiving level of some receiving channels is lower than the preset threshold If the receiving level of some receiving channels is higher than the set threshold, it is judged that the connected antenna is a smart antenna, and the antenna is faulty; if the receiving level of each receiving channel is lower than the preset threshold, continue as follows detection; 3' A signal with a certain power is transmitted by one of the transmission channels, and the other channels receive it. If the receiving level of the other channels exceeds the preset threshold value, it is judged that the antenna connected to the transmission channel is a smart antenna, and the antenna is faulty; if If the receiving levels of the remaining channels are lower than the preset threshold, it is judged that the antenna connected to the transmitting channel is a distributed antenna, and the detection ends. 2. the detection method to the TD-SCDMA multi-channel radio remote unit antenna system as claimed in claim 1, it is characterized in that when detecting, said forward power detection and reverse power detection are time division multiplexing identical detection pathway. 3. the detection method to the TD-SCDMA multi-channel radio frequency remote unit antenna system as claimed in claim 1, it is characterized in that in the detection process, when it is judged as failure, an alarm signal is sent simultaneously. 4. the detection method to the TD-SCDMA multi-channel radio remote unit antenna system as described in one of claims 1 to 3, it is characterized in that the forward power connected with said power detection processing unit in said detection channel The detection circuit and the reverse power detection circuit are respectively a forward coupling circuit coupled with the transmitting channel in the receiving and transmitting channels of each corresponding channel and a reverse coupling circuit coupled with the receiving channel, the forward coupling circuit and the power detection processing unit The main control unit and the reverse coupling circuit are respectively connected with the switch structure controlled by the main control unit. detection unit. 5. The detection method to the TD-SCDMA multi-channel radio frequency remote unit antenna system as claimed in claim 4, characterized in that said forward coupling circuit and reverse coupling circuit are realized by couplers or radio frequency coupling lines. 6. the detection method to the TD-SCDMA multi-channel radio frequency remote unit antenna system as described in one of claims 1 to 3, it is characterized in that said power detection processing unit converts the radio frequency signal of each coupling circuit into quantifiable The level signal is transmitted to the main control unit for detection and judgment by the main control unit. 7. the detection method to the TD-SCDMA multi-channel radio frequency remote unit antenna system as claimed in claim 6, it is characterized in that said power detection processing unit is a radio frequency detector, or cooperates with the digital analog transponder signal handler.

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