CN112533248B - Method and terminal for detecting downlink out-of-step of LTE-G system - Google Patents
Method and terminal for detecting downlink out-of-step of LTE-G system Download PDFInfo
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Abstract
The embodiment of the invention provides a downlink out-of-step detection method and a terminal of an LTE-G system, wherein the method comprises the following steps: if the current terminal is a single-band terminal, receiving synchronous frame data; if the current terminal is a multi-sub-band terminal, receiving a synchronous signal in a broadcast sub-band; performing time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band to obtain a time-frequency estimation result; the time-frequency estimation result comprises a time offset value and/or a frequency offset value; and determining a downlink out-of-step detection result based on the time-frequency estimation result. The method and the terminal provided by the embodiment of the invention use the time-frequency estimation result obtained by time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band for downlink out-of-step detection, and can meet the real-time requirement of the downlink out-of-step detection, thereby improving the accuracy of the downlink out-of-step detection and guaranteeing the wireless communication quality.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a downlink out-of-step detection method and a terminal for an LTE-G system.
Background
In a wireless private network LTE-G system, uplink and downlink interactions during communication are prone to cause uplink and downlink out-of-step. Out-of-sync signals, which are embodied as unsynchronized signals, will interfere with signals in adjacent timeslots, and when the phase offset is severe, the uplink signals are sent in downlink timeslots or downlink signals are sent in uplink timeslots, which will cause severe interference to communications in the service area, resulting in degradation of call quality and traffic indexes in the service area, such as: the noise is large, the number of the downlink paging response frames is low, the frequency blocking rate is high, and the like during the call; and in severe cases, the time slot is lost and the base station is blocked.
In the prior art, for downlink out-of-sync detection in a wireless link, the downlink out-of-sync detection is generally performed by detecting a change in downlink signal-to-noise ratio of a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) and a physical downlink control channel (Physical Downlink Control Channel, PDCCH), and if the downlink signal-to-noise ratio is continuously lower than a preset signal-to-noise ratio threshold for a period of time, determining that the downlink is out-of-sync.
However, transmission of PDSCH and PDCCH has discontinuity, resulting in poor real-time performance of the method for downlink out-of-step detection by downlink signal-to-noise ratio, low accuracy of detection result, and easy misjudgment.
Disclosure of Invention
The embodiment of the invention provides a downlink out-of-step detection method and a terminal of an LTE-G system, which are used for solving the problems that the existing downlink out-of-step detection method is low in detection result accuracy and easy to cause misjudgment.
In a first aspect, an embodiment of the present invention provides a downlink out-of-step detection method for an LTE-G system, including:
if the current terminal is a single-band terminal, receiving synchronous frame data;
if the current terminal is a multi-sub-band terminal, receiving a synchronous signal in a broadcast sub-band;
performing time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band to obtain a time-frequency estimation result; the time-frequency estimation result comprises a time offset value and/or a frequency offset value;
and determining a downlink out-of-step detection result based on the time-frequency estimation result.
Preferably, the determining a downlink out-of-step detection result based on the time-frequency estimation result specifically includes:
if the time-frequency estimation result is larger than a preset threshold, determining that the data state of the time-frequency estimation result is abnormal;
and determining the downlink out-of-step detection result based on the data states of the preset number of continuous time-frequency estimation results.
Preferably, the preset threshold comprises a time offset preset threshold and/or a frequency offset preset threshold;
correspondingly, if the time-frequency estimation result is greater than a preset threshold, determining that the data state of the time-frequency estimation result is abnormal specifically includes:
and if the time offset value is larger than the time offset preset threshold or the frequency offset value is larger than the frequency offset preset threshold, determining that the data state of the time-frequency estimation result is abnormal.
Preferably, the determining the downlink out-of-step detection result based on the data states of the preset number of continuous time-frequency estimation results specifically includes:
if the number of the time-frequency estimation results with the abnormal data state in the preset number of continuous time-frequency estimation results is greater than or equal to a preset number threshold, determining that the downlink step-out detection result is step-out; otherwise, determining that the downlink out-of-step detection result is synchronous.
Preferably, the performing time-frequency estimation based on the synchronization frame data or the synchronization signal in the broadcast sub-band, to obtain a time-frequency estimation result, and then further includes:
and performing time-frequency compensation based on the time-frequency estimation result.
In a second aspect, an embodiment of the present invention provides a terminal of an LTE-G system, including:
the synchronous receiving unit is used for receiving synchronous frame data if the current terminal is a single-belt terminal; if the current terminal is a multi-sub-band terminal, receiving a synchronous signal in a broadcast sub-band;
the time-frequency estimation unit is used for performing time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band to obtain a time-frequency estimation result; the time-frequency estimation result comprises a time offset value and/or a frequency offset value;
and the step-out detection unit is used for determining a downlink step-out detection result based on the time-frequency estimation result.
Preferably, the step-out detection unit includes:
a data state determining subunit, configured to determine that the data state of the time-frequency estimation result is abnormal if the time-frequency estimation result is greater than a preset threshold;
and the detection result determining subunit is used for determining the downlink out-of-step detection result based on the data states of the preset number of continuous time-frequency estimation results.
Preferably, the preset threshold comprises a time offset preset threshold and/or a frequency offset preset threshold;
correspondingly, the detection result determining subunit is specifically configured to:
and if the time offset value is larger than the time offset preset threshold or the frequency offset value is larger than the frequency offset preset threshold, determining that the data state of the time-frequency estimation result is abnormal.
In a third aspect, an embodiment of the invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method as provided in the first aspect when executing the computer program.
In a fourth aspect, embodiments of the present invention provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method as provided by the first aspect.
According to the downlink out-of-step detection method and the terminal for the LTE-G system, which are provided by the embodiment of the invention, the time-frequency estimation result obtained by performing time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band is used for downlink out-of-step detection, so that the real-time requirement of the downlink out-of-step detection can be met, the accuracy of the downlink out-of-step detection is improved, and the wireless communication quality is ensured.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a downlink step-out detection method of an LTE-G system according to an embodiment of the present invention;
fig. 2 is a flow chart of a downlink out-of-step detection method of an LTE-G system according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a terminal of an LTE-G system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The existing method for detecting downlink out-of-step through downlink signal-to-noise ratio has poor real-time performance, low accuracy of detection results and easy misjudgment. In this regard, the embodiment of the invention provides a downlink out-of-step detection method for an LTE-G system. Fig. 1 is a flow chart of a downlink step-out detection method of an LTE-G system according to an embodiment of the present invention, as shown in fig. 1, an execution body of the method may be a terminal, where the method includes:
step 110, if the current terminal is a single-band terminal, receiving synchronous frame data; and if the current terminal is a multi-sub-band terminal, receiving the synchronous signal in the broadcast sub-band.
Specifically, the synchronization frame data and the synchronization signal in the broadcast sub-band are both signals transmitted by the base station side for achieving synchronization between the terminal and the base station. According to the setting of the LTE-G system, a base station transmits a synchronization signal once through a broadcast sub-band every 16 radio frames, the synchronization signal in the broadcast sub-band is composed of two PSS (Primary Synchronzation Signal, main synchronization signal) sequences, the base station transmits synchronization frame data once to a sub-band terminal every 40 radio frames, correspondingly, a multi-sub-band terminal can receive the synchronization signal in the broadcast sub-band, and the sub-band terminal can receive the synchronization frame data.
Step 120, performing time-frequency estimation based on the synchronization frame data or the synchronization signal in the broadcast sub-band to obtain a time-frequency estimation result; the time-frequency estimation result comprises a time offset value and/or a frequency offset value.
Specifically, after the synchronization signal in the synchronization frame data or the broadcast sub-band is obtained, time-frequency estimation may be performed based on the synchronization signal in the synchronization frame data or the broadcast sub-band. Here, if the current terminal is a single-subband terminal, time-frequency estimation is performed based on the synchronization frame data, and if the current terminal is a multi-subband terminal, time-frequency estimation is performed based on the synchronization signal in the broadcast subband.
Step 130, determining a downlink out-of-step detection result based on the time-frequency estimation result.
Specifically, after the time-frequency estimation is completed, a downlink out-of-step detection result is determined based on the time-frequency estimation result. For example, the time-frequency estimation result is compared with a preset threshold value, that is, a preset threshold, and if the time-frequency estimation result is greater than the preset threshold, the current network may have a problem. If the number of time-frequency estimation results exceeding the preset number threshold is larger than the preset threshold in the preset number of continuous time-frequency estimation results, determining that the downlink out-of-step detection result is out-of-step.
According to the method provided by the embodiment of the invention, the time-frequency estimation result obtained by performing time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band is used for downlink out-of-step detection, so that the real-time requirement of the downlink out-of-step detection can be met, the accuracy of the downlink out-of-step detection is improved, and the wireless communication quality is ensured.
Based on the above embodiment, in the method, step 130 specifically includes:
step 131, if the time-frequency estimation result is greater than the preset threshold, determining that the data state of the time-frequency estimation result is abnormal.
Here, the preset threshold is the maximum value of the time-frequency estimation result when the preset data state is normal, and the data state is used for representing whether the time-frequency estimation result is in a normal range, and the data state can be normal or abnormal. When the time frequency estimation result is larger than a preset threshold, determining that the data state of the time frequency estimation result is abnormal, and when the time frequency estimation result is smaller than or equal to the preset threshold, determining that the data state of the time frequency estimation result is normal.
Further, the time-frequency estimation result comprises a time-offset value and/or a frequency offset value, the corresponding preset threshold comprises a time-offset preset threshold and/or a frequency offset preset threshold, when the time-frequency estimation result is the time-offset value, the time-offset value is compared with the time-offset preset threshold, and if the time-offset value is larger than the time-offset preset threshold, the data state of the time-frequency estimation result is abnormal; when the time frequency estimation result is a frequency offset value, comparing the frequency offset value with a frequency offset preset threshold, and if the frequency offset value is larger than the frequency offset preset threshold, determining that the data state of the time frequency estimation result is abnormal; when the time frequency estimation result comprises a time offset value and a frequency offset value, respectively comparing the time offset value with a time offset preset threshold, and comparing the frequency offset value with a frequency offset preset threshold, and if the time offset value is larger than the time offset preset threshold or the frequency offset value is larger than the frequency offset preset threshold, determining that the data state of the time frequency estimation result is abnormal.
Step 132, determining a downlink out-of-step detection result based on the data states of the preset number of continuous time-frequency estimation results.
Specifically, at a single moment, the data state of the time-frequency estimation result obtained by performing time-frequency estimation based on the synchronization frame data or the synchronization signal in the broadcast sub-band may be abnormal due to a temporary network quality problem, but the temporary network quality problem does not necessarily cause the terminal to step out in the downlink. Therefore, when the downlink out-of-step detection is performed, the downlink out-of-step detection result is determined based on the data states of the preset number of continuous time-frequency estimation results, so that the accuracy of the downlink out-of-step detection result is further improved. Here, the preset number refers to a preset number, for example, 4. Assuming that the single-baseband terminal receives one synchronous frame data every 40 frames, the data state of the time-frequency estimation results corresponding to the received 4 synchronous frame data in 160 frames can be used as the judgment basis of the downlink out-of-step detection result.
According to the method provided by the embodiment of the invention, the downlink out-of-step detection result is determined based on the data states of the preset number of continuous time-frequency estimation results, so that the problem of misjudgment of the downlink out-of-step detection caused by the temporary network quality problem can be avoided, and the accuracy of the downlink out-of-step detection is further improved.
Based on any of the above embodiments, the method further includes a step 132: if the number of the time-frequency estimation results with abnormal data states in the preset number of continuous time-frequency estimation results is greater than or equal to a preset number threshold, determining that the downlink out-of-step detection result is out-of-step; otherwise, determining that the downlink out-of-step detection result is synchronous.
The preset quantity threshold is a minimum value of the quantity of time-frequency estimation results with abnormal data states when the downlink is out of step. Assuming that the preset number is 4, the preset number threshold is 3, and determining that the downlink out-of-step detection result is out-of-step if 3 time-frequency estimation results with abnormal data states or the data states of the 4 time-frequency estimation results are abnormal in 4 continuous time-frequency estimation results; if 1 or two time-frequency estimation results with abnormal data states exist or the data states of 4 time-frequency estimation results are all normal, determining that the downlink out-of-step detection results are synchronous.
Based on any of the above embodiments, the method further includes, after step 120: and performing time-frequency compensation based on the time-frequency estimation result.
Specifically, after the time-frequency estimation result is obtained, time-offset compensation can be performed according to the time-offset value in the time-frequency estimation result, and frequency-offset compensation can be performed according to the frequency-offset value in the time-frequency estimation result.
Based on any of the above embodiments, fig. 2 is a flow chart of a downlink out-of-step detection method of an LTE-G system according to another embodiment of the present invention, where, as shown in fig. 2, the downlink out-of-step detection method of the LTE-G system specifically includes:
step 210, judging the terminal type: if the current terminal is a single sub-band terminal, step 221 is performed, and if the current terminal is a multi-sub-band terminal, step 222 is performed;
step 221, the single-band terminal receives the synchronous frame data issued by the base station, and then step 230 is executed;
step 222, the multi-subband terminal receives the synchronization signal issued by the base station through the broadcast subband, and then step 230 is executed;
step 230, time offset and frequency offset estimation: the single-band terminal carries out time offset estimation and frequency offset estimation based on synchronous frame data to obtain a time offset estimation result and a frequency offset estimation result; the multi-sub-band terminal performs time offset estimation and frequency offset estimation based on the synchronous signals in the broadcast sub-band to obtain a time offset estimation result and a frequency offset estimation result, and then step 240 is executed;
step 240, the terminal performs time offset compensation based on the time offset estimation result, performs frequency offset compensation based on the frequency offset estimation result, immediately adds +1 to the compensation frequency, and executes step 250;
step 250, judging whether the time-frequency estimation result is larger than a preset threshold: if the time offset estimation result is greater than the time offset preset threshold, or the frequency offset estimation result is greater than the frequency offset preset threshold, executing step 260, otherwise executing step 270;
step 260, the number of anomalies is +1, and step 270 is executed;
step 270, performing out-of-step detection according to the number of compensations and the number of anomalies: assuming that the compensation frequency is equal to 4 and the anomaly frequency is greater than or equal to 3, determining that the step-out detection result is step-out.
According to the method provided by the embodiment of the invention, the time-frequency estimation result obtained by performing time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band is used for downlink out-of-step detection, so that the real-time requirement of the downlink out-of-step detection can be met, the accuracy of the downlink out-of-step detection is improved, and the wireless communication quality is ensured.
Based on any one of the above embodiments, fig. 3 is a schematic structural diagram of a terminal of an LTE-G system according to an embodiment of the present invention, and as shown in fig. 3, the terminal includes a synchronous receiving unit 310, a time-frequency estimating unit 320, and a step-out detecting unit 330;
the synchronous receiving unit 310 is configured to receive synchronous frame data if the current terminal is a single-band terminal; if the current terminal is a multi-sub-band terminal, receiving a synchronous signal in a broadcast sub-band;
the time-frequency estimation unit 320 is configured to perform time-frequency estimation based on the synchronization frame data or the synchronization signal in the broadcast sub-band, so as to obtain a time-frequency estimation result; the time-frequency estimation result comprises a time offset value and/or a frequency offset value;
the step-out detection unit 330 is configured to determine a downlink step-out detection result based on the time-frequency estimation result.
The terminal provided by the embodiment of the invention uses the time-frequency estimation result obtained by time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band for downlink out-of-step detection, and can meet the real-time requirement of the downlink out-of-step detection, thereby improving the accuracy of the downlink out-of-step detection and guaranteeing the wireless communication quality.
Based on any of the above embodiments, in the terminal, the step-out detection unit 330 includes:
a data state determining subunit, configured to determine that the data state of the time-frequency estimation result is abnormal if the time-frequency estimation result is greater than a preset threshold;
and the detection result determining subunit is used for determining the downlink out-of-step detection result based on the data states of the preset number of continuous time-frequency estimation results.
Based on any one of the above embodiments, in the terminal, the preset threshold includes a time offset preset threshold and/or a frequency offset preset threshold;
correspondingly, the data state determining subunit is specifically configured to:
and if the time offset value is larger than the time offset preset threshold or the frequency offset value is larger than the frequency offset preset threshold, determining that the data state of the time-frequency estimation result is abnormal.
Based on any one of the foregoing embodiments, in the terminal, the detection result determining subunit is specifically configured to:
if the number of the time-frequency estimation results with the abnormal data state in the preset number of continuous time-frequency estimation results is greater than or equal to a preset number threshold, determining that the downlink step-out detection result is step-out; otherwise, determining that the downlink out-of-step detection result is synchronous.
Based on any of the above embodiments, the terminal further includes:
and the time-frequency compensation unit is used for performing time-frequency compensation based on the time-frequency estimation result.
Fig. 4 illustrates a physical schematic diagram of an electronic device, as shown in fig. 4, which may include: processor 410, communication interface (Communications Interface) 420, memory 430 and communication bus 440, wherein processor 410, communication interface 420 and memory 430 communicate with each other via communication bus 440. The processor 410 may call logic instructions in the memory 430 to perform the following method: if the current terminal is a single-band terminal, receiving synchronous frame data; if the current terminal is a multi-sub-band terminal, receiving a synchronous signal in a broadcast sub-band; performing time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band to obtain a time-frequency estimation result; the time-frequency estimation result comprises a time offset value and/or a frequency offset value; and determining a downlink out-of-step detection result based on the time-frequency estimation result.
Further, the logic instructions in the memory 430 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Embodiments of the present invention also provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the methods provided by the above embodiments, for example, comprising: if the current terminal is a single-band terminal, receiving synchronous frame data; if the current terminal is a multi-sub-band terminal, receiving a synchronous signal in a broadcast sub-band; performing time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band to obtain a time-frequency estimation result; the time-frequency estimation result comprises a time offset value and/or a frequency offset value; and determining a downlink out-of-step detection result based on the time-frequency estimation result.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The downlink out-of-step detection method of the LTE-G system is characterized by comprising the following steps of:
if the current terminal is a single-band terminal, receiving synchronous frame data, wherein the synchronous frame data is issued to the single-band terminal by a base station every 40 wireless frames;
if the current terminal is a multi-sub-band terminal, receiving a synchronous signal in a broadcast sub-band, wherein the synchronous signal is issued by a base station through the broadcast sub-band every 16 wireless frames;
performing time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band to obtain a time-frequency estimation result; the time-frequency estimation result comprises a time offset value and/or a frequency offset value;
and determining a downlink out-of-step detection result based on the time-frequency estimation result.
2. The method for downlink out-of-step detection of an LTE-G system according to claim 1, wherein the determining the downlink out-of-step detection result based on the time-frequency estimation result specifically includes:
if the time-frequency estimation result is larger than a preset threshold, determining that the data state of the time-frequency estimation result is abnormal;
and determining the downlink out-of-step detection result based on the data states of the preset number of continuous time-frequency estimation results.
3. The downlink out-of-step detection method of an LTE-G system according to claim 2, wherein the preset threshold includes a time offset preset threshold and/or a frequency offset preset threshold;
correspondingly, if the time-frequency estimation result is greater than a preset threshold, determining that the data state of the time-frequency estimation result is abnormal specifically includes:
and if the time offset value is larger than the time offset preset threshold or the frequency offset value is larger than the frequency offset preset threshold, determining that the data state of the time-frequency estimation result is abnormal.
4. The method for downlink out-of-step detection of an LTE-G system according to claim 2, wherein the determining the downlink out-of-step detection result based on the data states of a preset number of consecutive time-frequency estimation results specifically includes:
if the number of the time-frequency estimation results with the abnormal data state in the preset number of continuous time-frequency estimation results is greater than or equal to a preset number threshold, determining that the downlink step-out detection result is step-out; otherwise, determining that the downlink out-of-step detection result is synchronous.
5. The method for downlink out-of-step detection of an LTE-G system according to any one of claims 1 to 4, wherein the performing time-frequency estimation based on the synchronization frame data or the synchronization signal in the broadcast sub-band, to obtain a time-frequency estimation result, further includes:
and performing time-frequency compensation based on the time-frequency estimation result.
6. A terminal of an LTE-G system, comprising:
the synchronous receiving unit is used for receiving synchronous frame data if the current terminal is a single-band terminal, wherein the synchronous frame data is issued to the single-band terminal by the base station every 40 wireless frames; if the current terminal is a multi-sub-band terminal, receiving a synchronous signal in a broadcast sub-band, wherein the synchronous signal is issued by a base station through the broadcast sub-band every 16 wireless frames;
the time-frequency estimation unit is used for performing time-frequency estimation based on the synchronous frame data or the synchronous signals in the broadcast sub-band to obtain a time-frequency estimation result; the time-frequency estimation result comprises a time offset value and/or a frequency offset value;
and the step-out detection unit is used for determining a downlink step-out detection result based on the time-frequency estimation result.
7. The terminal of the LTE-G system according to claim 6, wherein the step-out detection unit includes:
a data state determining subunit, configured to determine that the data state of the time-frequency estimation result is abnormal if the time-frequency estimation result is greater than a preset threshold;
and the detection result determining subunit is used for determining the downlink out-of-step detection result based on the data states of the preset number of continuous time-frequency estimation results.
8. The terminal of the LTE-G system according to claim 7, wherein the preset threshold comprises a time offset preset threshold and/or a frequency offset preset threshold;
correspondingly, the detection result determining subunit is specifically configured to:
and if the time offset value is larger than the time offset preset threshold or the frequency offset value is larger than the frequency offset preset threshold, determining that the data state of the time-frequency estimation result is abnormal.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the computer program, implements the steps of the method for downlink out-of-step detection of an LTE-G system according to any one of claims 1 to 5.
10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the method for downlink out-of-step detection of an LTE-G system according to any one of claims 1 to 5.
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