CN1328922C - Method of optimal system reconfiguration after intelligent antenna array element failure - Google Patents

Abstract

The invention relates to a method for re-optimizing the system reconfiguration after the failure of the array element of the smart antenna, comprising: setting the smart antenna base station constituting the coherent array channel; operating the base station system, and automatically detecting the working status of the transceiver channel in the array channel, including up and down Generation of uplink channel detection signals and measurement of channel response signals to detect failed uplink and downlink channel numbers; reconfigure the system according to existing conditions and optimize performance. In the smart antenna base station implemented by the method provided by the present invention, when the array element fails, as long as the hardware failure does not affect all the resources that make the sector work normally, the system can still detect the working status of the array element by itself, reconfigure the system and maximize the performance Excellent, maintain the communication function of the system.

Description

A method for re-optimal configuration of the system after the failure of the smart antenna element

technical field

The invention relates to a method for system reconfiguration after the failure of the array elements in the array channel of the smart antenna system in the field of mobile communication, in particular to a method for maintaining the system after the partial failure of the array channel of the smart antenna base station, which is suitable for equidistant line arrays and uniform circular array systems. A method of array configuration for optimal performance.

Background technique

The smart antenna base station controls the direction and shape of the antenna beam by weighting the amplitude and phase of the signals received and transmitted by the array channel to achieve directional transmission and reception for desired users. The array channel adopts a uniform circular array with omnidirectional coverage or an equidistant line array with sectoral coverage. The downlink common channel of the base station is transmitted omnidirectionally within the coverage area, while the downlink traffic channel is directionally transmitted to the direction of the designated user with lower radio frequency power. Smart antennas enable users to achieve optimal performance for different signal environments, and achieve the purpose of improving system capacity through airspace filtering, increasing coverage distance, and reducing co-channel interference.

The relative performance of the uplink/downlink channels of the smart antenna array is consistent after channel calibration, and all base station array channels are used for uplink and downlink signal processing. Uplink signal processing algorithms include maximum ratio combining MRC and adaptive algorithms. The transmission of the downlink channel can be configured as multi-channel (low-power beamforming) transmission and single-channel (high-power omnidirectional) selective transmission. For a smart antenna system with multi-channel low-power configuration (such as a uniform circular array with 8 array elements or an equidistant line array with sector coverage), when some array elements fail, before the base station channel is backed up or repaired, the original The performance of some signal processing methods will be reduced. When some array elements of the smart antenna system fail, as long as the hardware failure does not affect all the resources to make the sector work normally, in order to achieve the best performance of the system under the existing working conditions, it is necessary to detect the working status of the array channel and reconfiguration to maintain the communications capabilities of the smart base station and achieve optimal performance under current conditions. Therefore, the failure detection and system reconfiguration of the smart antenna elements are very important in the smart antenna system.

Contents of the invention

The technical problem solved by the present invention is to propose a method for re-optimizing the system after the failure of the smart antenna array elements. The smart antenna base station can automatically detect the working status of each array element, and maintain the communication of the smart base station when some array elements of the system fail. features and network capabilities within coverage.

In order to achieve the above-mentioned purpose of the invention, the present invention provides a method suitable for array channel detection and channel reconfiguration of 8 array elements (a uniform circular array of 8 array elements or an equidistant line array covered by sectors), which includes the following step:

(1) Set up a smart antenna base station with coherent array channel characteristics. The array channel includes indoor (transceiver) and outdoor (RF front-end) units of the smart base station, radio frequency connecting cables and antenna arrays (8 antenna components, circular arrays or linear arrays) components). Each transceiver of the base station is designed according to 4 receiving/transmitting channels, two (master/slave) transceivers form 8 coherent channels through the interconnection of local oscillator signals, and the master transceiver is connected to the even-numbered antennas (0, 2, 4, 6), from the transceiver to the odd numbered antennas (1, 3, 5, 7) of the outdoor antenna array;

(2) The base station automatically detects the working status of the transceiver channel, including the generation of the uplink and downlink channel detection signals and the measurement of the channel response signals, so as to obtain the failed uplink and downlink channel numbers;

(3) Reconfigure the system according to the existing conditions and optimize the performance.

Specifically, the present invention provides a method for optimally reconfiguring the system after a smart antenna element fails, which is characterized in that it includes the following steps:

Step 1, setting up the smart antenna base station forming the coherent array channel;

Step 2, the base station system operates and automatically detects the working status of the transceiver channel in the array channel, including the generation of the uplink and downlink channel detection signals and the measurement of the channel response signal, and detects the failed uplink and downlink channel numbers;

Step three, reconfigure the system according to the existing conditions and optimize the performance.

The positive effect that the present invention can bring is that, when the smart antenna base station implemented by the method provided by the present invention fails, as long as the hardware fault does not affect all the resources for the normal operation of the sector, the system can still self-detect the array element. Meta-working status, reconfigure the system and optimize the performance, and maintain the communication function of the system.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is the structural diagram of the smart antenna system of the present invention;

Figure 2 is the overall flow chart of the present invention.

Detailed ways

The embodiment of the present invention is given below according to Fig. 1 and Fig. 2, and the method of the present invention is further described.

Fig. 1 shows the structure of the coherent channel of the smart antenna base station array using the method of the present invention. It mainly includes an antenna array 100 (the distance between the antenna arrays is less than one wavelength) and an outdoor radio frequency front end (the radio frequency front end includes 8 downlink power amplifiers and uplink low noise amplifiers, wherein the power of two power amplifiers is The gain is relatively large, corresponding to the 0th and 1st channels of the two transceivers, in case of single-channel high-power transmission; the RF front-end also includes RF channel conversion when the RF channel signal from the transceiver does not correspond to the front-end circuit circuit, in case the failure of the array element occurs in the flexible configuration of two transceivers), feeder cable 102, control cable 103 (transmits the control signal of the radio frequency channel conversion circuit), 8-channel coherent transceiver 104, baseband processing Unit (including channel detection function) 105 and base station main control unit 106. The above-mentioned 8-channel coherent transceiver 104 is composed of 2 independent 4-channel transceivers, each transceiver includes 4 receivers and 4 transmitters, and the local oscillator signals of the two transceivers are coherent connection method.

Fig. 2 is the implementation process of the method of the present invention, comprising:

Step 201, start;

Step 202, first set up the smart antenna base station that constitutes the coherent array channel. The characteristics are: the transceivers in the array channel are designed according to 8 coherent transceiver channels, and the array is a uniform circular array with omnidirectional coverage or an equidistant area covered by sectors. line array;

Step 203, during the normal operation of the base station system, start the channel state detection function module in real time, report to the main control unit of the base station when there is an array element failure in the base station, and turn off the relevant radio frequency power supply of the failed array element;

Step 204, the main control unit of the base station selects a specific channel configuration scheme and a baseband signal processing method according to the number of failed array elements and the number of channels to make the system achieve the best performance;

Step 205, end.

In the above-mentioned method of the present invention, during the normal operation of the base station system, the steps of detecting and reporting the working state of the channel in real time include:

The first step, channel connection cable detection: After setting up the smart antenna base station, determine the connection between the indoor and outdoor corresponding units through one-to-one corresponding enabling and power detection of the indoor part (transmitter) and outdoor RF front-end (power amplifier) of each channel The state of the cable.

The second step is the under-power detection of the transmission channel: by inputting the I and Q signals of the rated amplitude in the baseband of each transmitter, the maximum output power of the 8 channels is measured, and the ratio of the transmission power of each channel is greater than a certain value. It can be judged that the channel is under-powered or faulty.

The third step is low-sensitivity detection of the receiving channel: the beacon antenna sends a rated power detection signal, and the signal amplitude is measured at the I and Q output terminals of each receiver. When the ratio of the maximum value to the received signal amplitude of each channel is greater than a certain value It can be judged that the sensitivity of the channel is low or there is a fault.

The fourth step is to count whether the uplink and downlink channels are invalid, and report the numbers of the uplink and downlink channels if there are failures.

The system re-optimally configures the array channel means that the system can still derate to maintain communication and achieve optimal under current conditions when some array elements fail. The process includes:

In the first step, it is determined whether the failed uplink/downlink channel belongs to the same transceiver. The antenna array elements corresponding to a single transceiver are fixedly configured according to odd (1, 3, 5, 7 antennas) and even (0, 2, 4, 6) antennas, as shown in Fig. 1 .

In the second step, when the failed array element is in the same transceiver and the system is an equidistant linear array structure, then turn off the failed transceiver and the power supply of the RF front-end circuit, and the system uses another transceiver to configure a uniform 4-element array channel, at this time, the distance between the array elements is twice that of 8-element, the baseband downlink beamforming algorithm is performed as a 4-element uniform line array, and the base station reports the specific array element failure alarm signal through the network;

When the failed array element is in the same transceiver and the system is a uniform circular array structure, turn off the receiver/transmitter circuit power supply and the RF front-end circuit power supply corresponding to the failed array element, and the system is dynamically configured as 5-7 For a multi-element array channel, the baseband downlink beamforming algorithm is performed as a multi-element circular array, and the base station reports a specific array element failure alarm signal through the network;

In the third step, if the failed array element occurs in two transceivers and the number of failed receivers and transmitters is less than 4, then close the receiver and sender of the corresponding failure channel in the two transceivers The power supply of the machine circuit, the system uses the RF channel conversion circuit of the RF front end, and the two transceivers are flexibly configured as a 4-element uniform circular array or an equidistant line array channel with sector coverage according to even or odd antennas, and the baseband The downlink beamforming algorithm is performed according to the circular array/linear array structure of 4 array elements. Or the downlink dedicated channel is transmitted according to the 4-element circular array/linear array according to the downlink beamforming algorithm, and the downlink common channel is transmitted according to the single-channel high-power in the fourth step of the reconfiguration of the array channel process; at the same time, the base station passes through the network Report specific array element failure alarm signals.

In the fourth step, when the third step in the process of reconfiguring the array channel can not be configured as a uniform 4 array channel, the downlink selects a normal transmitter and the RF front end and its RF channel conversion circuit to form a downlink channel. High-power single-channel transmission, uplink selects less than 4 normal receiving channels for MRC processing to maintain the communication function of the system. And report the alarm information.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (9)

1, a kind of smart antenna array element back system method of allocation optimum again that lost efficacy is characterized in that, comprises the steps:

Step 1 is provided with the intelligent antenna base station that constitutes the coherent array passage;

The operating state of transceiver channel in the described array channel is moved, detected automatically to step 2, base station system, comprises the generation of up-downgoing access detection signal and the measurement of channel response signal, detects the up-downgoing channel number that lost efficacy;

Step 3, select optimum array channel configuration and base band signal process to make the systematic function optimum according to the quantity of inefficacy array element and channel number number, still can derate when optimum array channel configuration refers to have array element to lose efficacy in system keep in communication and be issued to optimum working as precondition.

2, the smart antenna array element according to claim 1 back system method of allocation optimum again that lost efficacy is characterized in that in step 1, the setting up procedure of described intelligent antenna base station comprises:

Two-way circuit connects aerial array, radio-frequency front-end, radio frequency stube cable, 8 passages relevant transceiver, the baseband processing unit with passage measuring ability module and base station main control unit successively;

It is the even ring array of omnidirectional's covering or the uniform line-array that covers by the sector that aerial array is set.

3, the smart antenna array element according to claim 2 back system method of allocation optimum again that lost efficacy, it is characterized in that, independently 4 passage master transceivers and one form from transceiver the relevant transceiver of described 8 passages by one, interconnected formation 8 phase dry passages by local oscillation signal, wherein main transceiver is connected to the even number antenna (0,2,4,6) of aerial array, is connected to the odd number antenna (1,3,5,7) of aerial array from transceiver.

4, the smart antenna array element according to claim 2 back system method of allocation optimum again that lost efficacy is characterized in that described setting up procedure also comprises:

8 tunnel downlink power amplifier and up low noise amplifier are set in described radio-frequency front-end, wherein have the power gain of two-way amplifier bigger, the 0th, 1 passage of corresponding two transceivers is respectively used during in order to the high-power emission of single channel.

5, according to systems after claim 2 or the 4 described smart antenna array elements inefficacies method of allocation optimum again, it is characterized in that described setting up procedure also comprises:

In described radio-frequency front-end, be provided with comprise from radio-frequency channel signal and the front-end circuit of transceiver non-to seasonable radio-frequency channel change-over circuit, the flexible configuration when occurring in two transceivers in order to the array element inefficacy.

6, the smart antenna array element according to claim 2 back system method of allocation optimum again that lost efficacy, it is characterized in that, in step 2, in the base station system normal course of operation, start channel status measuring ability module in real time, reporting base station main control unit when existing array element to lose efficacy in the base station, and close the relevant radio-frequency power supply of inefficacy array element.

7, the smart antenna array element according to claim 6 back system method of allocation optimum again that lost efficacy is characterized in that, the detection in the step 2 and report process to comprise the steps:

The passage stube cable detects: after setting up intelligent antenna base station, by the corresponding one by one state that enables to judge with power detection the corresponding unit stube cable of transceiver and radio-frequency front-end;

The transmission channel underpower detects: by I, the Q signal in each sender base band input normal amplitude, measure the peak power output of 8 passages, this passage underpower output of decidable or break down during greater than first predetermined value with the ratio of the transmitting power of each passage;

The receive path muting sensitivity detects: beacon antenna is sent out a rated power detection signal, in each receiver I, Q measurement of output end signal amplitude, the ratio of maximum wherein and each channel receiving signal amplitude during greater than second predetermined value this channel sensitivity of decidable low or break down;

Whether statistics up-downgoing passage has inefficacy, if any the up-downgoing channel number number that reports inefficacy.

8, the smart antenna array element according to claim 2 back system method of allocation optimum again that lost efficacy, it is characterized in that, described allocation optimum array channel is meant that system that it(?) still can derate when having array element to lose efficacy keeps in communication and is being issued to optimum when precondition, and its process comprises:

The first step determines whether the up/down going channel that lost efficacy belongs to same transceiver, and the bay of single transceiver correspondence is at first pressed odd number antenna (1,3,5,7), even number antenna (0,2,4,6) fixed configurations;

Second step, when the array element that lost efficacy is in same transceiver and system and is the uniform line-array structure, then close the transceiver and the radio-frequency (RF) front-end circuit power supply of this inefficacy, system uses another transceiver to be configured to uniform 4 array element array channels, twice when this moment, array element distance was 8 array elements, base band down beam shaping algorithm is undertaken by 4 array element even linear arrays, and the base station reports concrete array element Failure Alarm signal by network simultaneously;

When the array element that lost efficacy when to be in same transceiver and system be even ring array structure, then close the pairing receipts of the array element/sender circuit power and the radio-frequency (RF) front-end circuit power supply of inefficacy, system dynamics is configured to many array element array channel of 5-7 array element, base band down beam shaping algorithm is undertaken by the ring array of many array elements, and the base station reports concrete array element Failure Alarm signal by network simultaneously;

The 3rd step, occur in the receiver of two transceivers and inefficacy and sender number less than 4 o'clock as the array element that lost efficacy, then close the receiver and the sender circuit power of inefficacy passage corresponding in two transceivers, system uses the radio-frequency channel change-over circuit of radio-frequency front-end, two transceiver flexible configuration become a peace even number or odd number antenna and equal space line array passage that the even circle ring array of 4 array elements that disposes or sector cover, and base band down beam shaping algorithm is undertaken by the ring array/linear array structure of 4 array elements; Perhaps downlink dedicated channels is launched according to the down beam shaping algorithm by 4 array element ring array/linear arrays, and descending common channel is according to originally reconfiguring single channel high-power launch of array channel process in the 4th step; The base station reports concrete array element Failure Alarm signal by network simultaneously;

The 4th step, when according to originally reconfiguring the 3rd in array channel process step can not be configured to even 4 array channels the time, the normal sender of then descending selection cooperates a down going channel of formation and carries out high-power single channel emission with radio-frequency front-end and radio-frequency channel change-over circuit thereof, up then the selection carried out the MRC processing less than 4 normal passages that receive, keeping the communication function of system, and report warning message.

9, the smart antenna array element according to claim 2 back system method of allocation optimum again that lost efficacy is characterized in that the spacing of described aerial array is less than a wavelength.