KR100863226B1 - Signal detecting apparatus and method for mobile communication system of tdd type - Google Patents

Abstract

A signal monitoring device for a TDD(Time Division Duplex)-type mobile communication system and a signal monitoring method are provided to monitor both a transmission signal and a return signal by using the one signal monitoring device, thereby cutting down size and price of equipment. A branch unit(132a) branches a transmission signal and a return signal returned from a transmission antenna. A reporting unit(132b) reports a signal level of the first branch signal for the transmission signal and the second branch signal for the return signal to an upper end. The reporting unit comprises as follows. A detector(132b-1) detects the branched signals as voltages to output the voltages. A storage element(132b-2) stores a comparison table for signal levels of each signal voltage. A CPU(Central Processing Unit)(132b-3) perceives signal levels of the transmission signal and the return signal to report the perceived signals to the upper end.

Description

SIGNAL DETECTING APPARATUS AND METHOD FOR MOBILE COMMUNICATION SYSTEM OF TDD TYPE}

The present invention relates to a technique for monitoring transmission signals and carrier signals.

In general, if the strength of a transmitted RF signal (hereinafter referred to as a 'transmission signal') is outside the appropriate level of the required level, it is difficult for the receiving side to detect the signal (when the transmitted signal is below an appropriate level) or the receiving side. In the mobile communication system, after monitoring (diagnosing) the signal level of a transmission signal, it is possible to cause unexpected damage to the communication devices of the mobile communication system. The transmitter is configured to adjust the signal level of the transmission signal so that the transmission signal can be transmitted.

As a technique for monitoring a conventional transmission signal, Korean Laid-Open Patent Publication No. 10-2006-0014730 (Applicant: Samsung Electronics Co., Inventor: Cheol-Soo Seo, Name of the Invention: Time-division duplex transmission / reception apparatus using both transmission and reception modes and the same Self-diagnostic method) (hereinafter referred to as 'prior art 1') may be referred to.

Referring to the prior art 1, a directional coupler is provided between an RF filter (named BPF in the prior art) and an antenna to monitor a signal level of a transmission signal, and a signal coupled by the directional coupler is connected by an external diagnostic block. The presence of abnormality is diagnosed.

On the other hand, mismatch of the transmission antenna (disruption, short circuit, etc.) generates a carrier signal having a signal level equal to or higher than the matching standard. For example, when a transmission signal sent to the transmission antenna side generates a certain amount of carrier signals, the signal level of the carrier signal returned from the transmission antenna side is higher than the matching standard (e.g., the signal level of the transmission signal is 50 dBm). If the matching standard is 20dB, the signal transmission level of the carrier signal is 30dBm or more), which means that the transmission antenna is not matched, that is, it is mismatched. In this case, when the transmission antenna is mismatched (when the return signal is higher than the matching standard), the signal level of the transmission signal output through the transmission antenna is inevitably small, which causes problems in the communication quality such as a small communication radius. .

Therefore, by monitoring the signal level of the carrier signal to configure the monitoring device for monitoring the matching state of the transmission antenna, it is possible to immediately respond when an abnormality occurs in the matching state of the transmission antenna.

Regarding the antenna matching state monitoring technology, Korea Registered Utility Model Publication No. 0135764 (Applicant: ACE Transition Technology Co., Ltd., Designated name: Antenna matching state monitoring device, hereinafter referred to as 'Prior Technology 2'), Republic of Korea Patent Publication No. 2000-0001672 (Applicant Samsung Electronics Co., Ltd., name of the invention: a method for measuring a reception antenna matching ratio using a transmission output detection unit of a base station test equipment, hereinafter referred to as 'prior art 3') may be referred to.

However, in the current mobile communication system, a monitoring device for monitoring a transmission signal and a monitoring device for monitoring a carrier signal are separately configured. This is a factor that increases the size of the system and increases the price.

In addition, according to the prior art as described above, the directional coupler is provided between the RF filter and the antenna for filtering the signal, and to detect the transmission signal or the carrier signal coupled by the directional coupler. Therefore, by separately designing a device for monitoring a transmission signal or a carrier signal, it was necessary to design in consideration of the space for mounting the monitoring device, and this also contributed to the size of the system and the price increase.

The present invention is to solve the above problems, an object of the present invention is a signal monitoring apparatus for a mobile communication system of the TDD method that can perform a monitoring function for monitoring the transmission signal and a monitoring function for monitoring the carrier signal It is to provide a technology that can be implemented.

Still another object of the present invention is to provide a technique for implementing a signal monitoring value inside a filter.

A signal monitoring apparatus for a TDD mobile communication system according to the present invention for achieving the above object comprises: branching means for branching a transmission signal and a carrier signal carried from a transmission antenna; And reporting means for reporting the signal level of the first branch signal for the transmission signal branched from the branching means and the second branch signal for the carrier signal to the upper end. It includes, The reporting means, The detector for detecting and outputting the branch signal branched by the branch means (Voltage); A storage element for storing a comparison table for signal levels for each voltage of the signals; And a central processor for comparing the voltage for the transmission signal and the voltage for the carrier signal output from the detector to a comparison table stored in the storage element to determine the signal level of the transmission signal and the carrier signal and to report the signal to the upper stage. Characterized in that it comprises a.

The CPU may further receive different voltages based on a voltage for the transmission signal output from the detector and a system clock for input the voltage for the carrier signal.

The CPU may further calculate an average of a plurality of signal levels according to a plurality of voltages sequentially output from the detector, and then report the average of the calculated signal levels to the upper end.

In addition, the RF monitoring filter for a mobile communication system of the TDD system according to the present invention for achieving the above object, the filtering unit is provided for filtering the transmission signal; And a signal monitoring apparatus for reporting the signal level of the transmission signal output from the filtering unit and the signal level of the transmission signal returned from the transmission antenna side after being output to the transmission antenna side through the filtering unit. Characterized in that it comprises a.

The signal monitoring unit comprises: branching means for branching the transmission signal and the carrier signal; And reporting means for reporting the signal level of the first branch signal for the transmission signal branched from the branching means and the signal level of the second branch signal for the carrier signal to the upper end. It includes a more specific feature to include.

The reporting means includes: a detector for detecting and outputting a branch signal branched by the branching means with a voltage; A storage element for storing a comparison table for signal levels for each voltage of the signals; And a central processor for comparing the voltage for the transmission signal and the voltage for the carrier signal output from the detector to a comparison table stored in the storage element to determine the signal level of the transmission signal and the carrier signal and to report the signal to the upper stage. To include more and more specific features.

In addition, a signal transmission apparatus for a TDD mobile communication system according to the present invention for achieving the above object, D / A conversion unit for converting the digital signal to be converted into IF signal and output; A signal up-up part configured to output an IF signal output from the D / A converter up to an RF signal; And filtering the RF signal output from the signal upstream part to the transmission antenna side, and detecting the transmission signal output from the transmission antenna side and the carrier signal from the transmission antenna side to increase the signal level of the transmission signal and the carrier signal. RF monitoring filter to report to the stage; Characterized in that it comprises a.

In addition, a signal monitoring method in a TDD mobile communication system according to the present invention for achieving the above object, the transmission signal monitoring step of reporting the signal level of the transmission signal output to the transmission antenna side to the upper end; And a carrier signal monitoring step of reporting a signal level of a carrier signal returned from the transmitter antenna side to an upper end after being output to the transmitter antenna side. The transmission signal monitoring step includes: a transmission signal branching step of branching a transmission signal outputted to the transmission antenna side; And a signal level reporting step of reporting the signal level of the branch signal branched from the transmission signal branching step to the upper end. The signal level reporting step may include: a detecting step of detecting and outputting a branch signal output by branching in the transmission signal branching step with a voltage; A determination step of determining a signal level according to voltage output through the detecting step; And a reporting step of reporting the signal level determined in the determination step to the upper end. Characterized in that it comprises a.

In the determining step, the signal level of the transmission signal may be determined based on the calculated average of a plurality of signal levels according to a plurality of voltages sequentially output through the detecting step. .

The carrier signal monitoring step may include: a carrier signal branching step of branching a carrier signal; And a signal level reporting step of reporting the signal level of the branch signal branched from the carrier signal branching step to the upper end. The signal level reporting step includes: a detecting step of detecting and outputting a branch signal output by branching in the carrier signal branching step with a voltage; A determination step of determining a signal level according to voltage output through the detecting step; And a reporting step of reporting the signal level determined in the determination step to the upper end. Characterized in that it comprises a.

In another aspect, the transmission signal monitoring step detects a transmission signal and the carrier signal monitoring step detects a carrier signal.

The transmission signal monitoring step and the carrier signal monitoring step may be performed by different frames based on an input system clock.

In addition, a signal monitoring method in a TDD mobile communication system according to the present invention for achieving the above object, the transmission signal monitoring step of reporting the signal level of the transmission signal output to the transmission antenna side to the upper end; And a carrier signal monitoring step of reporting a signal level of a carrier signal returned from the transmitter antenna side to an upper end after being output to the transmitter antenna side. The carrier signal monitoring step includes: a carrier signal branching step of branching a carrier signal; And a signal level reporting step of reporting the signal level of the branch signal branched from the carrier signal branching step to the upper end. The signal level reporting step includes: a detecting step of detecting and outputting a branch signal output by branching in the carrier signal branching step with a voltage; A determination step of determining a signal level according to voltage output through the detecting step; And a reporting step of reporting the signal level determined in the determination step to the upper end. Characterized in that it comprises a.

In the determining step, the signal level of the carrier signal may be determined using the average calculated by calculating an average of a plurality of signal levels according to a plurality of voltages sequentially output through the detecting step. .

In another aspect, the transmission signal monitoring step detects a transmission signal and the carrier signal monitoring step detects a carrier signal.

The transmission signal monitoring step and the carrier signal monitoring step may be performed by different frames based on an input system clock.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment according to the present invention as described above will be described in detail.

1 is a block diagram of a signal transmission apparatus 100 (hereinafter, abbreviated as "signal transmission apparatus") of a mobile communication system according to an embodiment of the present invention.

As shown in FIG. 1, the signal transmission apparatus 100 includes a D / A converter 110, a signal uplinker 120, an RF monitoring filter 130, and the like.

The D / A converter 110 converts the input digital signal into an IF signal and outputs the converted IF signal.

The signal upward unit 120 upwardly outputs an IF signal output from the D / A converter 110 as an RF signal.

The RF monitoring filter 130 filters the RF signal output from the signal upstream unit 120 (passes only the required band) and outputs the RF signal to the transmission antenna (TxA) side. In addition, the RF monitoring filter 130 detects the transmission signal output to the transmission antenna (TxA) and the carrier signal returned from the transmission antenna (TxA) side, and reports the signal level of the transmission signal and the carrier signal to the upper stage. Play a role. The RF monitoring filter 130 is a characteristic configuration of the present invention, and has a detailed configuration as shown in the block diagram of FIG.

As illustrated in FIG. 2, the RF monitoring filter 130 includes a filtering unit 131, a signal monitoring device 132, and the like.

The filtering unit 131 is for filtering the RF signal output from the signal upstream unit 120 and includes a band pass filter.

The signal monitoring device 132 detects the transmission signal output from the transmission antenna TxA side and the transmission signal output from the transmission antenna TxA side through the filtering unit 131, and then detects the transmission signal and the transmission signal detected. It reports the signal level of to upper level.

Herein, in more detail, the signal monitoring device 132 built in the RF monitoring filter 130 may include branching means for branching the transmission signal output from the transmission antenna TxA side and the transport signal returned from the transmission antenna TxA side ( It can be seen that it comprises a report means 132b for reporting the signal level of the branch signal branched from the 132a and the branching means 132a to the upper end.

The branching means 132a may be constituted by a directional coupler or the like. In addition, a voltage for the first branch signal from which the transmission signal is branched is output to the first output port 132a-1 of the branching unit 132a, and a second branch of the carrier signal is branched to the second output port 132a-2. Voltage for the branch signal is output.

The reporting means 132b includes a detector 132b-1, a storage element 132b-2, a central processor 132b-3, and the like.

The detector 132b-1 detects and outputs the first and second branch signals branched by the branching means 132a with voltage.

The storage element 132b-2 stores a comparison table for signal level (dBm) for each voltage of the signal. Table 1 below is an example of a comparison table.

TABLE 1

Output value (dBm) Detector (Voltage) 43.0 4.00 Measure 42.9 3.99 Calculation 42.8 3.98 Calculation 42.7 3.97 Calculation 42.6 3.96 Calculation 42.5 3.95 Calculation 42.4 3.94 Calculation 42.3 3.93 Calculation 42.2 3.92 Calculation 42.1 3.91 Calculation 42.0 3.90 Measure 41.9 2.90 Calculation 41.8 2.80 Calculation : : : : : : 21.0 1.80 Measure 20.9 1.79 Calculation 20.8 1.78 Calculation 20.7 1.77 Calculation : : : : : : 20.0 1.70 Measure 19.9 1.69 Calculation : : : : : : 18.0 1.50 Measure

As can be seen from Table 1, each of the plurality of voltages corresponds to each signal level dBm. Correspondence between voltage and signal level (dBm) according to Table 1 is measured by an experiment. For example, the voltage (V / V ') output through the detector 132b-1 is 4 means that the signal level is measured as 43, and when the voltage (V / V ') output through the detector 132b-1 is 3.9, the signal level is measured as 42. For reference, the signal level of 0.1dB is calculated by dividing 1dB into 10 equal parts.

The central processor 132b-3 compares the voltage (V / V ') output from the detector 132b-1 to a comparison table stored in the storage element 132b-2 to determine the signal level of the transmission signal, and then identifies the signal. The signal level is reported to the higher level. For example, when the voltage (V / V ') output from the detector 132b-1 is 3.98, the central processor 132a-3 displays the voltage (V / V') of 3.98 in the table of Table 1. In comparison, the signal level corresponding to the voltage (V / V ') of 3.98 is found to be 42.8 dBm, and the determined 42.8 dBm is reported to the upper level as the signal level for the current transmission signal. Here, rather than implementing the signal level for each of the plurality of voltages (V / V ') sequentially output from the detector (13ba-1) to the upper stage, in the present invention sequentially output from the detector (132b-1) By calculating the average of a plurality of signal levels according to a plurality of voltages (for example, 55 or 20 times) (V / V '), and to report the calculated average to the upper stage It reduces the load and makes it easier to understand the signal level of the transmission signal. That is, when voltage (V / V ') is sequentially detected as 3.98, 3.99, ..., 3.97, the signal level obtained by averaging the corresponding 42.8, 42.9, ..., 42.7 dBm is higher. The signal level of the transmission signal to be reported is implemented. Of course, depending on the implementation, it may be possible to implement the average of the plurality of voltages (V / V ') that are sequentially output, and then obtain the signal level according to the average taken from the table and report to the upper stage.

In addition, the CPU 132b-3 receives the voltage V for the transmission signal and the voltage V 'for the carrier signal by changing frames based on the input system clock. That is, as shown in FIG. 4, the voltage V for the transmission signal is received in the first, fifth, ... frame sections, and the voltage for the carrier signal in the third, 7, ... frame sections. (V ') and the voltage (V) receiving section for the transmission signal and the voltage (V') receiving section for the carrier signal separated by one frame period in the signal transmission method in the TDD mobile communication system It implements a signal monitoring function that can be applied properly.

The signal monitoring method of the signal monitoring device 132 will be described with reference to the flowchart of FIG. 3 for convenience.

1. Transmission signal monitoring <S310>

The signal monitoring device 132 reports the signal level of the transmission signal passing through the filtering unit 131 to the upper level. This step S310 may be divided into more specific steps as follows.

1-1. Transmission signal branch <S311>

The branching means 132a branches the transmission signal passing through the filtering unit 131.

1-2. Signal level report <S312>

The reporting means 132b reports the signal level of the first branch signal branched at step S311 to the upper end. This step S312 may be divided into more specific steps.

1-2a. Detecting <S312a>

The detector 132b-1 detects and outputs the first branch signal which is branched by the branching means 132a in step S311 and output through the first output port 132a-1 as the voltage V.

1-2b. Judgment <S312b>

The central processor 132b-3 compares the voltage V output through step S312a with a comparison table stored in the storage element 132b-2 to determine the signal level of the transmission signal. In this case, the signal level is determined by calculating an average of a plurality of signal levels according to a plurality of voltages V sequentially output through step S312a to determine the signal level of the transmission signal.

1-2c. Report <S312c>

The CPU 132b-3 then reports the signal level determined in step S312b to the upper end.

2. Carrier signal monitoring <S320>

Subsequently, the signal monitoring device 132 outputs the signal level of the carrier signal, which is output from the transmission antenna TxA side after being output to the transmission antenna TxA side through the filtering unit 131, to the upper end. This step S330 may be divided into more specific steps as follows.

2-1. Carrier signal branch <S321>

The branching means 132a branches off the conveying signal conveyed from the transmission antenna TxA side.

2-2. Signal level report <S322>

The report means 132b reports the signal level of the second branch signal branched at step S321 to the upper end. This step S322 can be divided into more specific steps.

2-2a. Detecting <S322a>

The detector 132b-1 detects and outputs the second branch signal, which is branched by the branching means 132a, in step S321 and output through the first output port 132a-2 with a voltage V ′.

2-2b. Judgment <S322b>

The central processor 132b-3 compares the voltage V 'outputted through step S322a with a comparison table stored in the storage element 132b-2 to determine the signal level of the carrier signal. In this case, the signal level is determined by calculating an average of a plurality of signal levels according to the plurality of voltages V ′ sequentially output through step S322a to determine the signal level of the carrier signal.

3-2c. Report <S322c>

Subsequently, the central processor 132b-3 reports the signal level of the transmission signal or the carrier signal determined in step S322b to the upper end.

On the other hand, the above steps S310 and S320 are performed in different frame periods. That is, the CPU 132b-3 receives the voltage V of the branch signal with respect to the transmission signal in the first, fifth, ... frame periods based on the input system clock. S312b and S312c are performed, and in the third, seventh, ... frame periods, the voltage of the branch signal V 'with respect to the carrier signal is received and the steps S322b and S322c are performed.

As described above, the detailed description of the present invention has been made by the embodiments with reference to the accompanying drawings. However, since the above-described embodiments have only been described with reference to preferred examples of the present invention, the present invention is limited to the above embodiments. It should not be understood that the scope of the present invention is to be understood by the claims and equivalent concepts described below.

As described in detail above, according to the present invention, the monitoring function of the transmission signal and the monitoring signal of the carrier signal are implemented by one signal monitoring device, thereby reducing the size and cost of the equipment, and further, the RF monitoring of the filter. The built-in function can further reduce the size and cost of the equipment.

1 is a block diagram of a signal transmission apparatus of a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a block diagram of an RF monitoring filter applied to FIG. 1.

3 is a flowchart illustrating a method of operating the RF monitoring filter of FIG. 1.

4 is a reference diagram graphically illustrating a frame of a signal in the TDD scheme.

* Description of the code for the main parts of the drawings *

100: signal transmission device

110: D / A converter

120: signal upstream

130: RF monitoring filter

131: filtering unit

132: monitoring unit

132a: branching means

132b: Reporting means

132b-1: Detector

132b-2: Storage element

132b-3: Central Processor

Claims (14)

Branching means for branching a transmission signal and a transmission signal carried from the transmission antenna; And Reporting means for reporting the signal level of the first branch signal for the transmission signal branched from the branching means and the second branch signal for the carrier signal to the upper end; Including, The reporting means, A detector for detecting and outputting a branch signal branched by the branching means with a voltage; A storage element for storing a comparison table for signal levels for each voltage of the signals; And A central processor for comparing the voltage for the transmission signal and the voltage for the carrier signal output from the detector with a comparison table stored in the storage element to determine the signal level of the transmission signal and the carrier signal and to report the signal to the upper end; Signal monitoring device for a mobile communication system of the TDD method comprising a. The method of claim 1, The CPU is a signal monitoring device for a TDD type mobile communication system, characterized in that the frame is received based on the system clock input voltage and the voltage for the transmission signal output from the detector. . The method of claim 1, The central processor calculates an average of a plurality of signal levels according to a plurality of voltages sequentially output from the detector, and then reports the average of the calculated signal levels to the upper end. Signal monitoring device for communication system. delete A filtering unit provided to filter a transmission signal; And A signal monitoring device for reporting a signal level of a transmission signal output from the filtering unit and a signal level of a carrier signal returned from the transmission antenna side after being output to the transmission antenna side through the filtering unit; Including, The signal monitoring value, Branching means for branching the transmission signal and the carrier signal; And Reporting means for reporting the signal level of the first branch signal for the transmission signal branched from the branching means and the signal level of the second branch signal for the carrier signal to the upper end; RF monitoring filter for a mobile communication system of the TDD method comprising a. The method of claim 5, The reporting means, A detector for detecting and outputting a branch signal branched by the branching means with a voltage; A storage element for storing a comparison table for signal levels for each voltage of the signals; And A central processor for comparing the voltage for the transmission signal and the voltage for the carrier signal output from the detector with a comparison table stored in the storage element to determine the signal level of the transmission signal and the carrier signal and to report the signal to the upper end; RF monitoring filter for a mobile communication system of the TDD method comprising a. delete A transmission signal monitoring step of reporting a signal level of a transmission signal output to the transmission antenna side to an upper end; And A carrier signal monitoring step of reporting the signal level of the carrier signal returned from the transmitter antenna side to the upper end after being output to the transmitter antenna side; Including; The transmission signal monitoring step, A transmission signal branching step of branching a transmission signal outputted to the transmission antenna side; And A signal level reporting step of reporting a signal level of a branch signal branched from the transmission signal branching step to the upper end; Including, The signal level reporting step, A detecting step of detecting and outputting a branch signal output by branching in the transmission signal branching step with a voltage; A determination step of determining a signal level according to voltage output through the detecting step; And A reporting step of reporting the signal level determined in the determining step to the upper end; Signal monitoring method in a TDD mobile communication system comprising a. The method of claim 8, In the determining step, the signal level of the TDD method may be determined by calculating an average of a plurality of signal levels according to a plurality of voltages sequentially output through the detecting step. Signal monitoring method in mobile communication system. The method of claim 8, The carrier signal monitoring step, A carrier signal branching step of branching a carrier signal; And A signal level reporting step of reporting a signal level of a branch signal branched from the carrier signal branching step to the upper end; Including; The signal level reporting step, A detecting step of detecting and outputting a branch signal output by branching in the carrier signal branching step with a voltage; A determination step of determining a signal level according to voltage output through the detecting step; And A reporting step of reporting the signal level determined in the determining step to the upper end; Signal monitoring method in a TDD mobile communication system comprising a. A transmission signal monitoring step of reporting a signal level of a transmission signal output to the transmission antenna side to an upper end; And A carrier signal monitoring step of reporting the signal level of the carrier signal returned from the transmitter antenna side to the upper end after being output to the transmitter antenna side; Includes, the carrier signal monitoring step, A carrier signal branching step of branching a carrier signal; And A signal level reporting step of reporting a signal level of a branch signal branched from the carrier signal branching step to the upper end; Including, The signal level reporting step, A detecting step of detecting and outputting a branch signal output by branching in the carrier signal branching step with a voltage; A determination step of determining a signal level according to voltage output through the detecting step; And A reporting step of reporting the signal level determined in the determining step to the upper end; Signal monitoring method in a TDD mobile communication system comprising a. The method of claim 11, In the determining step, the signal level of the carrier signal may be determined based on the average calculated by calculating an average of a plurality of signal levels according to a plurality of voltages sequentially output through the detecting step. Signal monitoring method in mobile communication system. The method according to claim 8 or 11, wherein And a section for detecting a transmission signal in the transmission signal monitoring step and a section for detecting a carrier signal in the carrier signal monitoring step are isolated. The method of claim 13, And the transmission signal monitoring step and the carrier signal monitoring step are performed by different frames based on an input system clock.