CN109451531B - System and method for measuring field intensity in LTE cell range - Google Patents
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Abstract
The invention provides a field intensity measuring system and method in an LTE cell range.A field intensity measuring device is arranged, and comprises a radio frequency front end receiving module, a field intensity measuring module and a field intensity measuring module, wherein the radio frequency front end receiving module is used for collecting signals transmitted by an LTE base station and signals transmitted by an LTE mobile phone terminal, and obtaining C _ RNTI and associated uplink demodulation information of an LTE signal source through analyzing the signals; the frequency and time synchronization and holding module is used for acquiring frequency and time synchronization and holding the frequency and time synchronization; the multi-region energy measurement module of the pre-judging space is used for achieving fine synchronization, obtaining an accurate field intensity measurement value and realizing synchronous maintenance; and the OAM module is used for reporting and counting energy and exchanging information with the physical layer demodulation module. The method can simply and effectively obtain the accurate synchronous interval so as to obtain the accurate field intensity measurement value, and solve the problem of uplink desynchronization caused by the movement of the LTE target terminal, particularly the high-speed movement.
Description
Technical Field
The invention belongs to the field of wireless communication, and particularly relates to a field intensity measuring system and method in an LTE (Long term evolution) cell range.
Background
In recent years, LTE (Long Term Evolution) terminals have been widely popularized, and positioning of LTE terminals is realized by measuring signal sources of LTE terminals, and the LTE terminals are widely applied to private network wireless communication, criminal positioning, and disaster search and rescue. The LTE terminal positioning method commonly used at present is to calculate a downlink synchronization position by obtaining an LTE downlink Signal sent by a pseudo base station, further receive and analyze an Uplink PUSCH (Physical Uplink Shared Channel) Signal sent by a terminal, and position a terminal UE (user equipment) by measuring a Reference Signal Receiving Power (RSRP) of the PUSCH.
However, since the wireless signals are affected by noise interference, path loss, multipath fading, shadow fading and other factors during transmission, and these interferences adversely affect the capture of the energy of the LTE signal source, the conventional positioning method is prone to have a problem that uplink synchronization and field strength measurement cannot be completed due to downlink asynchronization, and meanwhile, the uplink energy measurement is inaccurate due to downlink synchronization measurement errors caused by the interference. In order to solve the problem of synchronization, the conventional method has the advantages that the stability of a clock is improved, a high-precision clock circuit is adopted, the requirement on the clock is high, and the cost is improved.
In order to solve the above problems, the present invention provides a field strength measurement system and method in an LTE cell range, which solve the problems that the existing field strength meter fails to complete uplink synchronization and field strength measurement due to the fact that the received downlink signal of the base station is too weak, and the uplink energy measurement is inaccurate due to the downlink synchronization measurement error caused by interference.
Disclosure of Invention
The invention aims to provide a technical scheme for measuring field intensity in an LTE cell range, and aims to solve the problems that uplink synchronization and field intensity measurement cannot be completed due to step loss and the measurement is inaccurate in the conventional method.
The technical scheme of the invention provides a field intensity measuring system in an LTE cell range, which is provided with field intensity measuring equipment and comprises the following modules,
the radio frequency front end receiving module is used for collecting signals transmitted by an LTE base station and signals transmitted by an LTE mobile phone terminal and analyzing the signals to obtain C _ RNTI and associated uplink demodulation information of an LTE signal source;
the frequency and time synchronization and holding module is used for acquiring frequency and time synchronization and holding the frequency and time synchronization;
the multi-region energy measurement module of the pre-judging space is used for achieving fine synchronization, obtaining an accurate field intensity measurement value and realizing synchronous maintenance;
and the OAM module is used for reporting and counting energy and exchanging information with the physical layer demodulation module.
And, the frequency and time synchronization and maintenance module,
the frequency synchronization is realized by acquiring a time synchronization signal, starting soft phase locking after the time synchronization signal is locked, and calibrating a local system clock source by using a pulse per second (1 pps) acquired by analyzing the time synchronization signal to realize frequency synchronization;
the time synchronization implementation mode is that after the frequency synchronization, the field intensity measuring equipment carries out air interface synchronization operation to obtain the position of a frame header of 10ms in the downlink, and then the position of the frame header of 10ms in the uplink is obtained to obtain the time synchronization;
the synchronization is maintained by maintaining the frequency and time stable with good short term stability of the local system clock source if the time synchronization signal is out of lock.
Furthermore, the multi-region energy measurement module of the prejudging space comprises the following steps,
step 3.1, analyzing the current message state; if the message of starting measurement, enter step 3.2, if stop measuring the message, withdraw from the present procedure;
step 3.2, calculating a pre-judgment space and selecting an uplink measurement signal;
step 3.3, segmenting the uplink signal and distributing an interval index;
step 3.4, calculating a power delay spectrum PDP, a time offset TA and reference signal received power RSRP of each interval signal respectively;
step 3.5, judging a synchronization interval according to the maximum value of the PDP;
step 3.6, reporting energy according to the synchronous interval, and counting the reported number M;
step 3.7, checking the synchronous interval according to the TA and recording the number of times of passing the check
Step 3.8, judging whether the energy reporting number M reaches a preset value X, if not, not updating the position T of the half framesubframeReturning to the step 3.1, and if the result is reached, continuing to execute the step 3.9;
and 3.9, resetting the reported number M, and comparing the synchronization interval with the maximum verification passing times with a threshold value Y. If the value is larger than or equal to the threshold, taking the middle point position of the interval as a new half-frame position TsubframeReturning to the step 3.1; if not, maintaining the original half frame position TsubframeAnd (5) returning to the step 3.1.
Furthermore, in step 3.2, the uplink measurement signals with length of L are selected before and after the half-frame position of the subframe to be measured is taken as the center, the total length is 2 × L,
the length L is calculated in the following manner,
L＝K+TTTI/2，
wherein,
called the extension interval, R is the adsorption radius of the pseudo station, C is the speed of light, ToscFor drift error of the clock, Tdl_proc_deviationFor downlink synchronization algorithm errors, TGTFor protection of the margin, TTTIIs the length of one subframe.
Furthermore, in said step 3.3, the signal segmentation is implemented in such a way that the interval T is not greater than the estimation range of the system TAintervalAnd selecting an interval signal with the length of one subframe in a sliding manner, and segmenting the uplink signal.
In step 3.5, the determination of the synchronization interval is implemented by finding out the maximum value MAX of PDP in all segmentsPDP，MAXPDPThe corresponding interval is the synchronous interval, the index number j of the synchronous interval at the moment and the TA value estimated by the synchronous interval are recorded
And, in the step 3.7, the synchronization interval is checked according to the TA, including determining whether the TA of the synchronization interval is within the valid range, and if the TA of the synchronization interval is within the valid range, the TA of the synchronization interval is considered to pass the check, otherwise, the TA of the synchronization interval does not pass the check.
Moreover, the effective range of TA depends on the interval T of the system TA estimation rangeintervalTA effective range is [ -T [)interval,Tinterval]。
The invention also provides a field intensity measuring method in the LTE cell range, which is provided with a field intensity measuring device and comprises the following steps,
the radio frequency front end receiving process comprises the steps of collecting signals transmitted by an LTE base station and signals transmitted by an LTE mobile phone terminal, and analyzing the signals to obtain C _ RNTI and associated uplink demodulation information of an LTE signal source;
a frequency and time synchronization and holding process, which comprises acquiring frequency and time synchronization and holding;
pre-judging the multi-region energy measurement process of the space, wherein the process comprises the steps of achieving fine synchronization, obtaining an accurate field intensity measurement value and realizing synchronous maintenance;
and the operation management and maintenance module is used for reporting and counting energy and exchanging information with the physical layer demodulation module.
Furthermore, in the frequency and time synchronization and maintenance module process,
the frequency synchronization is realized by acquiring a time synchronization signal, starting soft phase locking after the time synchronization signal is locked, and calibrating a local system clock source by using a pulse per second (1 pps) acquired by analyzing the time synchronization signal to realize frequency synchronization;
the time synchronization implementation mode is that after the frequency synchronization, the field intensity measuring equipment carries out air interface synchronization operation to obtain the position of a frame header of 10ms in the downlink, and then the position of the frame header of 10ms in the uplink is obtained to obtain the time synchronization;
the synchronization is maintained by maintaining the frequency and time stable with good short term stability of the local system clock source if the time synchronization signal is out of lock.
Furthermore, the multi-region energy measurement process of the prejudge space is executed by the following steps,
step 3.1, analyzing the current message state; if the message of starting measurement, enter step 3.2, if stop measuring the message, withdraw from the present procedure;
step 3.2, calculating a pre-judgment space and selecting an uplink measurement signal;
step 3.3, segmenting the uplink signal and distributing an interval index;
step 3.4, calculating a power delay spectrum PDP, a time offset TA and reference signal received power RSRP of each interval signal respectively;
step 3.5, judging a synchronization interval according to the maximum value of the PDP;
step 3.6, reporting energy according to the synchronous interval, and counting the reported number M;
step 3.7, checking the synchronous interval according to the TA and recording the number of times of passing the check
Step 3.8, judging whether the energy reporting number M reaches a preset value X, if not, not updating the position T of the half framesubframeReturning to the step 3.1, and if the result is reached, continuing to execute the step 3.9;
and 3.9, resetting the reported number M, and comparing the synchronization interval with the maximum verification passing times with a threshold value Y. If the value is larger than or equal to the threshold, taking the middle point position of the interval as a new half-frame position TsubframeReturning to the step 3.1; if not, maintaining the original half frame position TsubframeAnd (5) returning to the step 3.1.
The invention has the following advantages:
(1) the invention pre-judges the space where the signal appears, performs interval segmentation on the signal through a special interval standard in the pre-judged space, and can simply and effectively obtain an accurate synchronous interval through multi-area PDP (Power Delay Profile) detection so as to obtain an accurate field intensity measurement value;
(2) by checking and counting the synchronization interval, the pre-judgment space is adjusted in real time, the synchronization accuracy and reliability are improved, and the problem of uplink desynchronization caused by the movement of an LTE target terminal, particularly high-speed movement, is solved;
(3) the downlink air interface synchronization is only needed to be carried out once when the system is initialized, the probability that the uplink synchronization and the field intensity measurement cannot be finished due to downlink asynchronization caused by interference is reduced, and the reliability of the system is improved.
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FIG. 1 is a block diagram of a system architecture according to an embodiment of the present invention;
FIG. 2 is a flow chart of multi-region energy measurement in a prediction space according to an embodiment of the present invention;
Detailed Description
The following provides a detailed explanation of the main implementation principles, specific embodiments and the beneficial effects achieved by the present invention with reference to the embodiments.
The technical scheme of the invention can be applied to the PUSCH channel and can also be popularized to the SRS channel. The embodiment is described with a PUSCH channel as an example.
The system structure block diagram of the embodiment of the invention is shown in fig. 1, and comprises a pseudo base station, field intensity measuring equipment and target UE. The field strength measuring apparatus includes: the system comprises a radio frequency front end receiving module, a frequency and time synchronization and Maintenance module, an Operation Administration and Maintenance (OAM) subsystem and a multi-region energy measuring module of a pre-judging space.
The radio frequency front end receiving module is used for collecting signals transmitted by an LTE base station and signals transmitted by an LTE mobile phone terminal, and obtaining C _ RNTI (cell radio network temporary identifier) of an LTE signal source and associated uplink demodulation information thereof through analyzing the signals;
and the frequency and time synchronization and holding module is used for acquiring frequency and time synchronization and holding the frequency and time synchronization.
The frequency synchronization is to acquire a time synchronization signal, start soft phase locking after the time synchronization signal is locked, and calibrate a local system clock source by using 1pps (pulse per second) acquired by analyzing the time synchronization signal, thereby realizing frequency synchronization. The frequency synchronization is the basis for correct demodulation of the system, and if the frequency offset is large, demodulation errors occur.
The time synchronization is that after the frequency synchronization, the field intensity measuring equipment performs air interface synchronization operation to obtain the position of the frame header of the downlink 10ms, and further obtain the position of the uplink, and obtain the time synchronization. A time coarse synchronization is now achieved.
The maintaining is that if the time synchronization signal is out of lock, the frequency and the time are kept stable through good short-term stability of a local system clock source.
And the multi-region energy measurement module in the pre-judgment space is used for achieving fine synchronization, obtaining an accurate field intensity measurement value and realizing synchronous maintenance.
And the OAM module is used for reporting and counting energy and exchanging information with the physical layer demodulation module.
The multi-region energy measurement module of the prejudging space is realized on a physical layer, an OAM sends a starting or stopping message to the physical layer to inform the physical layer to start energy measurement or stop energy measurement, and the physical layer can reply a confirmation message to the OAM when starting or stopping measurement operation.
Taking TDD (Time Division duplex) 20M bandwidth and uplink and downlink Time ratio 1 as an example, the improved part in the embodiment of the present invention is explained:
1. radio frequency front end reception
Collecting signals transmitted by an LTE base station and signals transmitted by an LTE mobile phone terminal; obtaining LTE through analysis of signals
C _ RNTI and associated uplink demodulation information of the signal source;
2. frequency and time synchronization and maintenance
In this embodiment, the time synchronization signal is set as a Global Positioning System (GPS). After the GPS is locked, the soft lock phase starts to operate, and OCXO (Oven Controlled Crystal Oscillator) is calibrated by using the obtained 1pps, thereby achieving frequency synchronization. The frequency synchronization is the basis for correct demodulation of the system, and if the frequency offset is large, demodulation errors occur.
The time coarse synchronization comprises the following steps: after the frequency synchronization, the field intensity measuring equipment performs air interface synchronization operation to obtain the position of the frame header of the downlink 10ms, and further obtain the position of the uplink.
If the GPS is out of lock, the frequency and time are kept stable by the good short term stability of the OCXO.
3. Multi-zone energy measurement of look ahead space
By calculating a pre-judging space, performing interval segmentation on the signals by adopting a special interval standard in the pre-judging space where the uplink signals appear, and performing PDP (plasma display panel) detection on segmented intervals to obtain an accurate synchronous interval and a field intensity measured value; and checking the synchronization interval according to the TA, comparing the synchronization interval with the maximum checking passing frequency with a threshold when the reported energy number reaches a preset value, and updating the pre-judgment space if the synchronization interval is not less than the threshold so as to realize synchronization maintenance.
The embodiment comprises the following steps:
and 3.1, analyzing the current message state. If the message sent by the OAM module is a message for starting measurement, step 3.2 is entered for backward execution, and a confirmation message is replied to the OAM module, if the message is a message for stopping measurement, the current flow is exited, and a confirmation message is replied to the OAM module.
And 3.2, calculating a pre-judgment space and selecting an uplink measurement signal.
Selecting uplink measurement signals with length of L before and after taking the half-frame position of the subframe to be measured as the center, wherein the total length is 2L。
The embodiment of the invention selects the subframe 2 to carry out uplink measurement.
Calculating the position of the subframe 2 according to the head position of the uplink frame found by downlink synchronization during initialization, and recording the position of the half frame of the subframe 2 as Tsubframe. At the time of removal of initialization, TsubframeAnd adjusting according to the verified midpoint position of the synchronous area.
By TsubframeAnd selecting uplink measurement signals with the length of L before and after the center, wherein the total length is 2 multiplied by L. If a plurality of uplink subframes need to be measured, signals with the length of 2 xL are selected by taking the positions of the subframes as midpoints.
The length L is calculated in the following way: l is K + TTTIAnd/2, wherein,
called the extension interval, R is the adsorption radius of the pseudo station, C is the speed of light, ToscFor drift error of the clock, Tdl_proc_deviationFor downlink synchronization algorithm errors, TGTFor protection of the margin, TTTIIs the length of one subframe.
In this embodiment, a typical pseudo station coverage range R for positioning is 1.5KM, and a drift error T of a clockosc＝3us，Tdl_proc_deviationDepending on the algorithm error in the channel environment, 10us, T is takenGTAnd taking 10us, K equals 28us, L equals 528us, and the total length of the signal is 1056 us.
And 3.3, segmenting the uplink signal and distributing the interval index.
The signal segmentation is realized by an interval T which is not larger than the estimation range of the system TAintervalAnd selecting an interval signal with the length of one subframe in a sliding manner, and segmenting the uplink signal.
In specific implementation, the TA estimation range of the system may be determined according to the TA estimation method adopted by the system. In the embodiment of the invention, the traditional phase estimation method is used, and an empirical value can be preset as the sliding interval T according to the estimation range of the traditional phase estimation methodinterval。
T is preferred in this embodiment according to the signal segmentation implementationintervalIf 5us are taken, the total amount can be obtained
A signal of length 1 ms. I.e. from TsubframeStarting from the position of L, sliding to select 11 interval signals with the length of 1ms and the interval index of 1-11.
And 3.4, respectively calculating the PDP, the TA and the RSRP for each interval signal.
The method for solving the PDP by the PUSCH comprises the following steps: and after removing cyclic prefix, compensating 7.5KHz frequency offset, performing FFT conversion and demapping, extracting two rows of pilot signals of the PUSCH for channel estimation, adopting a channel estimation algorithm based on DFT, executing 1536-point IDFT conversion to a time domain in the channel estimation process, calculating PDP, and recording a PDP value.
The TA estimation comprises the following steps: and (2) adopting a traditional phase estimation method, namely, in DFT channel estimation, performing frequency domain correlation on the extracted PUSCH DMRS signal and a locally generated pilot signal, and estimating the time offset value of the current interval by using a phase correlation method according to the result after the frequency domain correlation. In this embodiment, when the interval between subcarriers is set to 6, the time offset range supported by the system is as follows
The phase estimation method is well known in the art and will not be described in detail.
The RSRP is as follows: and obtaining a channel coefficient through channel estimation, and calculating the RSRP of the LTE mobile phone terminal, wherein the RSRP is marked as UL _ RSRP and the unit is dbm.
The method specifically comprises the following steps:
wherein
Channel coefficient after channel estimation corresponding to ith subcarrier of p time slot of a (a) th antenna, wherein M is total number of subcarriers of UE (user equipment), N isRXFor the number of antennas, a denotes an antenna index, p denotes a slot number index, and i denotes a subcarrier index.
And 3.5, judging the synchronous interval according to the maximum value of the PDP.
The decision implementation mode of the synchronization interval is as follows: finding the maximum value MAX of PDP in all segmentsPDP，MAXPDPThe corresponding interval is the synchronous interval, the index number j of the synchronous interval at the moment and the TA value estimated by the synchronous interval are recorded
And 3.6, reporting the energy according to the synchronous interval, and counting the reported number M.
This step selects MAXPDPAnd reporting the RSRP value calculated in the corresponding interval to obtain an accurate PUSCH field strength result.
Step 3.7, checking the synchronization interval according to the TA, and recording the number N of times of passing the checkjAnd j corresponds to the section index.
The TA judgment standard is as follows: and judging whether the TA of the synchronization interval is in the effective range, if so, determining that the TA passes the verification, otherwise, determining that the TA does not pass the verification.
Further, the TA valid range depends on the interval T of the system TA estimation rangeintervalTA effective range is [ -T [)interval,Tinterval]。
Step 3.8, judging whether the energy reporting number M reaches a preset value X, if not, not updating the position T of the half framesubframeAnd returning to the step 3.1, and if the result is reached, continuing to execute the step 3.9.
In this embodiment, X is set to 100. If the reported number M does not reach 100, the position T of the half frame is not updatedsubframeAnd returning to the step 3.1, and if the result is reached, continuing to execute the step 3.9.
And 3.9, resetting the reported number M, and comparing the synchronization interval with the maximum verification passing times with a threshold value Y. If the value is larger than or equal to the threshold, taking the middle point position of the interval as a new TsubframeReturning to the step 3.1; if not, then maintaining original TsubframeAnd (5) returning to the step 3.1.
In this embodiment, Y is set to 40, and if the number of reports M reaches 100, the synchronization interval index j with the largest number of verification passes is 2, and the interval 2 passes 65 verification times in total, the number of reports M is cleared, and the midpoint position of the interval 2 is Tsubframe-L+(j-1/2)×Tinterval,TsubframeUpdate to the midpoint position of interval 2 and return to step 3.1.
Although the present invention has been described in detail and illustrated as examples, the present invention and applicable examples are not limited thereto and various modifications can be made by those skilled in the art in light of the principle of the present invention. Thus, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.
In specific implementation, the steps can realize automatic operation flow based on software technology.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. A field strength measurement system in an LTE cell range is characterized in that: a field strength measuring device is provided, comprising the following modules,
the radio frequency front end receiving module is used for collecting signals transmitted by an LTE base station and signals transmitted by an LTE mobile phone terminal and analyzing the signals to obtain C _ RNTI and associated uplink demodulation information of an LTE signal source;
the frequency and time synchronization and holding module is used for acquiring frequency and time synchronization and holding the frequency and time synchronization;
the multi-region energy measurement module of the pre-judging space is used for achieving fine synchronization, obtaining an accurate field intensity measurement value and realizing synchronous maintenance;
the OAM module is used for reporting and counting energy and exchanging information with the physical layer demodulation module;
the multi-region energy measurement module of the prejudging space executes the following steps,
step 3.1, analyzing the current message state; if the message of starting measurement, enter step 3.2, if stop measuring the message, withdraw from the present procedure;
step 3.2, calculating a pre-judgment space and selecting an uplink measurement signal;
step 3.3, segmenting the uplink signal and distributing an interval index;
step 3.4, calculating a power delay spectrum PDP, a time offset TA and reference signal received power RSRP of each interval signal respectively;
step 3.5, judging a synchronization interval according to the maximum value of the PDP;
step 3.6, reporting energy according to the synchronous interval, and counting the reported number M;
step 3.7, checking the synchronization interval according to the TA, and recording the number of times of passing the check;
step 3.8, judging whether the energy reporting number M reaches a preset value X, if not, not updating the position T of the half framesubframeReturning to the step 3.1, and if the result is reached, continuing to execute the step 3.9;
step 3.9, resetting the reported number M, and comparing the synchronization interval with the maximum verification passing times with a threshold value Y; if the value is larger than or equal to the threshold, taking the middle point position of the interval as a new half-frame position TsubframeReturning to the step 3.1;if not, maintaining the original half frame position TsubframeAnd (5) returning to the step 3.1.
2. The LTE cell-wide field strength measurement system of claim 1, wherein: in the frequency and time synchronization and maintenance module,
the frequency synchronization is realized by acquiring a time synchronization signal, starting soft phase locking after the time synchronization signal is locked, and calibrating a local system clock source by using a pulse per second (1 pps) acquired by analyzing the time synchronization signal to realize frequency synchronization;
the time synchronization implementation mode is that after the frequency synchronization, the field intensity measuring equipment carries out air interface synchronization operation to obtain the position of a frame header of 10ms in the downlink, and then the position of the frame header of 10ms in the uplink is obtained to obtain the time synchronization;
the synchronization is maintained by maintaining the frequency and time stable with good short term stability of the local system clock source if the time synchronization signal is out of lock.
3. The LTE cell-wide field strength measurement system of claim 1, wherein: in step 3.2, uplink measurement signals with a length of L are respectively selected before and after the half-frame position of the subframe to be measured is taken as the center, the total length is 2 xL,
the length L is calculated in the following manner,
L＝K+TTTI/2，
wherein,
called extension interval, R is the adsorption radius of LTE base station, C is the speed of light, ToscFor drift error of the clock, Tdl_proc_deviationFor downlink synchronization algorithm errors, TGTFor protection of the margin, TTTIIs the length of one subframe.
4. The LTE cell-wide field strength measurement system of claim 1, wherein: in said step 3.3, the signal segmentation is implemented in such a way that,at intervals T no greater than the estimated range of system TAintervalAnd selecting an interval signal with the length of one subframe in a sliding manner, and segmenting the uplink signal.
5. The LTE cell-wide field strength measurement system of claim 1, wherein: in step 3.5, the decision of the synchronization interval is implemented by finding out the maximum value MAX of PDP in all segmentsPDP，MAXPDPThe corresponding interval is the synchronous interval, the index number j of the synchronous interval at the moment and the TA value estimated by the synchronous interval are recorded
6. The LTE cell-wide field strength measurement system of claim 1, wherein: in step 3.7, the synchronization interval is checked according to the TA, including determining whether the TA of the synchronization interval is within the valid range, and if the TA of the synchronization interval is within the valid range, determining that the TA of the synchronization interval passes the check, otherwise, determining that the TA of the synchronization interval does not pass the check.
7. A field strength measurement method in an LTE cell range is characterized in that: setting a field strength measuring device, performing a process including,
the radio frequency front end receiving process comprises the steps of collecting signals transmitted by an LTE base station and signals transmitted by an LTE mobile phone terminal, and analyzing the signals to obtain C _ RNTI and associated uplink demodulation information of an LTE signal source;
a frequency and time synchronization and holding process, which comprises acquiring frequency and time synchronization and holding;
pre-judging the multi-region energy measurement process of the space, wherein the process comprises the steps of achieving fine synchronization, obtaining an accurate field intensity measurement value and realizing synchronous maintenance;
the operation management and maintenance process comprises the steps of reporting and counting energy and exchanging information with a physical layer demodulation module; the multi-region energy measurement process of the prejudge space is executed by the following steps,
step 3.1, analyzing the current message state; if the message of starting measurement, enter step 3.2, if stop measuring the message, withdraw from the present procedure;
step 3.2, calculating a pre-judgment space and selecting an uplink measurement signal;
step 3.3, segmenting the uplink signal and distributing an interval index;
step 3.4, calculating a power delay spectrum PDP, a time offset TA and reference signal received power RSRP of each interval signal respectively;
step 3.5, judging a synchronization interval according to the maximum value of the PDP;
step 3.6, reporting energy according to the synchronous interval, and counting the reported number M;
step 3.7, checking the synchronization interval according to the TA, and recording the number of times of passing the check;
step 3.8, judging whether the energy reporting number M reaches a preset value X, if not, not updating the position T of the half framesubframeReturning to the step 3.1, and if the result is reached, continuing to execute the step 3.9;
step 3.9, resetting the reported number M, and comparing the synchronization interval with the maximum verification passing times with a threshold value Y; if the value is larger than or equal to the threshold, taking the middle point position of the interval as a new half-frame position TsubframeReturning to the step 3.1; if not, maintaining the original half frame position TsubframeAnd (5) returning to the step 3.1.
8. The method of claim 7 for measuring field strength within a LTE cell, characterized in that: in the frequency and time synchronization and maintenance process,
the frequency synchronization is realized by acquiring a time synchronization signal, starting soft phase locking after the time synchronization signal is locked, and calibrating a local system clock source by using a pulse per second (1 pps) acquired by analyzing the time synchronization signal to realize frequency synchronization;
the time synchronization implementation mode is that after the frequency synchronization, the field intensity measuring equipment carries out air interface synchronization operation to obtain the position of a frame header of 10ms in the downlink, and then the position of the frame header of 10ms in the uplink is obtained to obtain the time synchronization;
the synchronization is maintained by maintaining the frequency and time stable with good short term stability of the local system clock source if the time synchronization signal is out of lock.
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