CN111988793A - Method, device, storage medium and terminal for detecting out-of-step of wireless link - Google Patents
Method, device, storage medium and terminal for detecting out-of-step of wireless link Download PDFInfo
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Abstract
The present disclosure relates to a method, an apparatus, a storage medium, and a terminal for detecting out-of-step of a wireless link, wherein the method comprises: in each first period after the terminal enters a connection state, performing out-of-step judgment on a wireless link of the terminal according to the receiving quality of each received target signal, a preset first receiving quality threshold and a ratio threshold, wherein the target signal comprises a reference signal and an auxiliary synchronization signal, or the reference signal; and in each second period after the wireless link is determined to be in the out-of-step state, carrying out synchronous judgment on the wireless link according to the received receiving quality of each reference signal and a preset second receiving quality threshold so as to determine whether the terminal is in the out-of-step state of the physical layer. The method can add the receiving quality of the auxiliary synchronous signal as an auxiliary judgment basis on the basis of synchronous and asynchronous judgment of the wireless link according to the receiving quality of the reference signal, thereby improving the accuracy of synchronous and asynchronous judgment of the wireless link.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for detecting out-of-synchronization of a wireless link, a storage medium, and a terminal.
Background
NBIoT (Narrowband internet of things) is a half-duplex network communication system, and an NBIoT device can only transmit or receive at a time, and generally operates in a Discontinuous small-traffic connection state such as idle Discontinuous Reception (DRX), connected Discontinuous Reception (DRX), or Power Saving Mode (PSM). Therefore, the NBIoT system needs to be in an unstable communication state such as receiving/transmitting switching, sleeping/receiving state switching, etc. often, the NBIoT receiver needs to enter a stable filtering state for a while. This instability of NBIoT has some impact on the wireless link quality detection, particularly the synchronization and de-synchronization decision.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a method, an apparatus, a storage medium, and a terminal for detecting out-of-synchronization of a wireless link.
According to a first aspect of the embodiments of the present disclosure, there is provided a method for detecting out-of-synchronization of a wireless link, the method including:
in each first period after the terminal enters a connection state, performing out-of-step judgment on a wireless link of the terminal according to the receiving quality of each received target signal, a preset first receiving quality threshold and a ratio threshold, wherein the target signal comprises a reference signal and an auxiliary synchronization signal, or the reference signal;
and in each second period after the wireless link is determined to be in the out-of-step state, carrying out synchronous judgment on the wireless link according to the received receiving quality of each reference signal and a preset second receiving quality threshold so as to determine whether the terminal is in the out-of-step state of a physical layer.
Optionally, the step-out determination of the radio link of the terminal according to the received quality of each target signal and a preset first receiving quality threshold and a ratio threshold in each first period after the terminal enters the connected state includes:
for each first period, determining the ratio of a first reference signal to all reference signals received in the first period, wherein the first reference signal is a reference signal whose received quality in the first period is lower than the first received quality threshold;
comparing the ratio with the ratio threshold to determine whether the wireless link is out of synchronization in the first period according to the comparison result and the receiving quality of the secondary synchronization signal, wherein the ratio threshold comprises: a first ratio threshold and a second ratio threshold;
and under the condition that the wireless link is determined to be out of step in a first preset number of continuous first periods, determining that the wireless link is in an out-of-step state.
Optionally, the comparing the ratio with the ratio threshold to determine whether the radio link is out of synchronization in the first period according to the comparison result and the reception quality of the secondary synchronization signal includes:
if the ratio is equal to 1, determining that the wireless link is out of synchronization in the first period; alternatively, the first and second electrodes may be,
if the ratio is larger than the first ratio threshold, determining that the wireless link is out of step in the first period; alternatively, the first and second electrodes may be,
and if the ratio is smaller than the first ratio threshold and larger than the second ratio threshold, and the receiving quality of all the secondary synchronization signals received in the first period is lower than the first receiving quality threshold, determining that the wireless link is out of synchronization in the first period.
Optionally, in each second period after the radio link is determined to be in the out-of-step state, performing synchronization decision on the radio link according to the received quality of each reference signal and a preset second reception quality threshold to determine whether the terminal is in the physical layer out-of-step state, where the method includes:
determining, for each second period, whether a second reference signal exists in all reference signals received within the second period, where the second reference signal is a reference signal whose reception quality is lower than the second reception quality threshold;
determining that the wireless link is in a synchronization state in the second period, in a case where it is determined that a second reference signal does not exist among all reference signals received in the second period;
under the condition that the wireless link is determined to be in the synchronous state in a second preset number of continuous second periods, determining that the wireless link recovers the synchronous state; alternatively, the first and second electrodes may be,
and determining that the terminal is in a physical layer out-of-synchronization state after determining that the wireless link is not in a synchronization state within the second preset number of consecutive second periods.
Optionally, before the step-out decision is performed on the radio link of the terminal according to the received quality of each target signal and a preset first reception quality threshold and a ratio threshold, the method further includes:
and determining the ratio threshold according to a plurality of preset threshold values, the receiving state of the cell where the terminal is located and the maximum repeated sending times of the physical downlink control channel subframes in the wireless link, wherein the plurality of threshold values are ratio threshold values determined by performing a simulation test on the invalid link through a preset algorithm.
Optionally, the receiving state includes: a continuous reception state and a discontinuous reception state, the plurality of threshold values including: a first ratio threshold, a second ratio threshold, a third ratio threshold, a fourth ratio threshold, and a number of times threshold;
the determining the ratio threshold according to a plurality of preset threshold values, the receiving state of the cell where the terminal is located and the maximum repeated transmission times of the physical downlink control channel subframe in the wireless link includes:
taking the fourth ratio threshold value as the second ratio threshold;
taking the first ratio threshold value as the second ratio threshold value under the condition that the receiving state of the cell is a continuous receiving state;
taking the second ratio threshold as the second ratio threshold under the condition that the receiving state of the cell is a discontinuous receiving state and the maximum repeated sending times is greater than the time threshold; alternatively, the first and second electrodes may be,
and taking the third ratio threshold value as the second ratio threshold under the condition that the receiving state of the cell is a discontinuous receiving state and the maximum repeated sending times is less than or equal to the time threshold value.
According to a second aspect of the embodiments of the present disclosure, there is provided an out-of-sync detection apparatus for a wireless link, the apparatus comprising:
the out-of-step judgment module is configured to perform out-of-step judgment on a wireless link of the terminal according to the receiving quality of each received target signal and a preset first receiving quality threshold and a ratio threshold in each first period after the terminal enters a connection state, wherein the target signal comprises a reference signal and an auxiliary synchronization signal, or the reference signal;
and the synchronization judging module is configured to perform synchronization judgment on the wireless link according to the received receiving quality of each reference signal and a preset second receiving quality threshold in each second period after the wireless link is determined to be in the out-of-synchronization state so as to determine whether the terminal is in the out-of-synchronization state of the physical layer.
Optionally, the step-out determining module is configured to:
for each first period, determining the ratio of a first reference signal to all reference signals received in the first period, wherein the first reference signal is a reference signal whose received quality in the first period is lower than the first received quality threshold;
comparing the ratio with the ratio threshold to determine whether the wireless link is out of synchronization in the first period according to the comparison result and the receiving quality of the secondary synchronization signal, wherein the ratio threshold comprises: a first ratio threshold and a second ratio threshold;
and under the condition that the wireless link is determined to be out of step in a first preset number of continuous first periods, determining that the wireless link is in an out-of-step state.
Optionally, the step-out determining module is configured to:
if the ratio is equal to 1, determining that the wireless link is out of synchronization in the first period; alternatively, the first and second electrodes may be,
if the ratio is larger than the first ratio threshold, determining that the wireless link is out of step in the first period; alternatively, the first and second electrodes may be,
and if the ratio is smaller than the first ratio threshold and larger than the second ratio threshold, and the receiving quality of all the secondary synchronization signals received in the first period is lower than the first receiving quality threshold, determining that the wireless link is out of synchronization in the first period.
Optionally, the synchronization decision module is configured to:
determining, for each second period, whether a second reference signal exists in all reference signals received within the second period, where the second reference signal is a reference signal whose reception quality is lower than the second reception quality threshold;
determining that the wireless link is in a synchronization state in the second period, in a case where it is determined that a second reference signal does not exist among all reference signals received in the second period;
under the condition that the wireless link is determined to be in the synchronous state in a second preset number of continuous second periods, determining that the wireless link recovers the synchronous state; alternatively, the first and second electrodes may be,
and determining that the terminal is in a physical layer out-of-synchronization state after determining that the wireless link is not in a synchronization state within the second preset number of consecutive second periods.
Optionally, the apparatus further comprises:
a threshold determining module configured to determine the ratio threshold according to a plurality of preset threshold values, a receiving state of a cell where the terminal is located, and a maximum number of repeated transmission times of a physical downlink control channel subframe in the wireless link, where the plurality of threshold values are ratio threshold values determined by performing a simulation test on the invalid link through a preset algorithm.
Optionally, the receiving state includes: a continuous reception state and a discontinuous reception state, the plurality of threshold values including: a first ratio threshold, a second ratio threshold, a third ratio threshold, a fourth ratio threshold, and a number of times threshold;
the threshold determination module configured to:
taking the fourth ratio threshold value as the second ratio threshold;
taking the first ratio threshold value as the second ratio threshold value under the condition that the receiving state of the cell is a continuous receiving state;
taking the second ratio threshold as the second ratio threshold under the condition that the receiving state of the cell is a discontinuous receiving state and the maximum repeated sending times is greater than the time threshold; alternatively, the first and second electrodes may be,
and taking the third ratio threshold value as the second ratio threshold under the condition that the receiving state of the cell is a discontinuous receiving state and the maximum repeated sending times is less than or equal to the time threshold value.
According to a third aspect of embodiments of the present disclosure, there is provided a computer-readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the steps of the out-of-sync detection method for a wireless link provided by the first aspect of the present disclosure.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a terminal, including: the second aspect of the present disclosure provides an out-of-synchronization detection apparatus for a wireless link.
According to the technical scheme provided by the embodiment of the disclosure, in each first period after the terminal enters the connection state, the out-of-step judgment can be performed on the wireless link of the terminal according to the receiving quality of each received target signal, a preset first receiving quality threshold and a ratio threshold, wherein the target signal comprises a reference signal and an auxiliary synchronization signal, or the reference signal; and in each second period after the wireless link is determined to be in the out-of-step state, carrying out synchronous judgment on the wireless link according to the received receiving quality of each reference signal and a preset second receiving quality threshold so as to determine whether the terminal is in the out-of-step state of the physical layer. The method can add the receiving quality of the auxiliary synchronous signal as an auxiliary judgment basis on the basis of synchronous and asynchronous judgment of the wireless link according to the receiving quality of the reference signal, thereby improving the accuracy of synchronous and asynchronous judgment of the wireless link.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a flow chart illustrating a method of out-of-sync detection for a wireless link in accordance with an exemplary embodiment;
fig. 2 is a flow chart of a method of out-of-sync decision for a wireless link according to fig. 1;
fig. 3 is a flow chart of a method of synchronization decision according to one of the wireless links shown in fig. 1;
fig. 4 is a flow chart of an out-of-sync decision method for the wireless link according to another embodiment shown in fig. 1;
FIG. 5 is a block diagram illustrating an out-of-sync detection arrangement for a wireless link in accordance with an exemplary embodiment;
FIG. 6 is a block diagram of an out-of-sync detection arrangement for the alternative wireless link shown in FIG. 5;
fig. 7 is a block diagram illustrating a terminal according to an example embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Before introducing the method for detecting the step-out of the wireless link provided by the present disclosure, a target application scenario related to each embodiment in the present disclosure is first introduced, where the target application scenario includes a terminal, the terminal is provided with a NBIoT system and can perform signal transmission through the wireless link, and the terminal may be, for example, a personal computer, a notebook computer, a smart phone, a tablet computer, a wearable device, and a terminal such as a vehicle, a home appliance, and a household appliance with a NBIoT network device.
Fig. 1 is a flowchart illustrating a method for detecting out-of-synchronization of a wireless link according to an exemplary embodiment, as shown in fig. 1, applied to a terminal described in the foregoing application scenario, the method includes the following steps:
in step 101, in each first period after the terminal enters the connection state, the out-of-step determination is performed on the wireless link of the terminal according to the received quality of each target signal and a preset first receiving quality threshold and ratio threshold.
Wherein the target signal comprises a reference signal and a secondary synchronization signal, or the reference signal.
Exemplarily, applied to NBIoT, the Reference Signal is NRS (narrow band Reference Signal) and the Secondary Synchronization Signal is NSSS (narrow band Secondary Synchronization Signal). Both NRS and NSSS are included in the communication sub-frame of the radio link. Each cell has a unique NRS, which occupies 8 or 16 REs (Resource Element) in one communication subframe, and after a terminal accesses the cell, the NRS corresponding to the cell is transmitted over a radio link between the terminal and the cell, and is used for performing downlink measurement on the radio link, thereby determining the communication quality of the radio link. The NSSS is also a signal specific to each cell, which occupies 132 REs in one communication subframe, and thus, the signal quality estimated based on the NSSS is relatively more reliable. Whether the radio link in the cell is reliable can be judged according to the signal receiving quality of the NSSS subframe corresponding to the cell. Meanwhile, if there is interference in the neighboring cell, both NRS and NSSS subframes will be affected, and if the signal reception quality of NSSS is low to a certain extent, it may be caused by poor cell signal or large interference. Therefore, in the embodiment of the present disclosure, the out-of-synchronization state of the wireless link may be determined through the NRS, and the out-of-synchronization determination may be assisted through the NSSS at the same time, so as to avoid the influence of the instability of the receiving state of the NBIoT system on the out-of-synchronization determination. The reception quality (or Signal reception quality) can be actually characterized by SNR (Signal-Noise Ratio).
Illustratively, in this step 101, after determining that the terminal and the cell base station form a wireless link (i.e., the terminal is in a connected state), an out-of-synchronization decision is made every a certain time duration (i.e., a first period), which is based on a comparison result of the received reception quality of NRS and NSSS and a preset first reception quality threshold. The actual value of the first reception quality threshold (and the second reception quality threshold in the following step 102) is an empirical value determined by performing a simulation test on the radio link between the terminal and the cell through a preset algorithm. The first period (and the following second period) is a duration parameter specified in the 3GPP TS 36.133 related standard for supporting radio resource management (Requirements for radio resource management).
In step 102, in each second period after the radio link is determined to be in the out-of-synchronization state, a synchronization decision is performed on the radio link according to the received quality of each reference signal and a preset second reception quality threshold, so as to determine whether the radio link is in the out-of-synchronization state of the physical layer.
Illustratively, once it is determined in step 101 that the wireless link is in an out-of-synchronization state, the terminal needs to send an out-of-synchronization (out of sync) message to a higher layer (e.g., a cell base station), so that the higher layer enters a synchronization message monitoring phase, and meanwhile, continues to make a synchronization decision for the terminal to monitor whether the wireless link recovers the synchronization state. The synchronization message monitoring stage is timed by a higher-layer timer, and the timing duration of the timer is a T310 duration parameter specified in the 3GPP TS 36.133 related standard. The decision of the synchronization decision is based on the reception quality of NRS only. When the wireless link is determined to be in a synchronous state, the terminal reports a synchronous (in-sync) message to a higher layer. If the terminal reports the synchronization message to the higher layer within the timing duration of T310, the higher layer may determine that the current radio link connection of the terminal is normal, and at this time, the terminal continues to repeat the synchronization monitoring process of the above step 101 and the step 102. If the terminal does not report the synchronization message to the high layer within the timing duration of T310, determining that the terminal is out of step in the physical layer, releasing the wireless link and reestablishing the wireless link according to the current actual condition. The physical layer out-of-synchronization state in the embodiment of the present disclosure is used to represent that the terminal is in a long-term out-of-synchronization state caused by physical layer factors (network equipment factors, for example, a terminal network equipment failure, a local cell base station failure).
In summary, in the technical solution provided in the embodiments of the present disclosure, in each first period after a terminal enters a connected state, an out-of-step determination may be performed on a radio link of the terminal according to a received quality of each target signal and a preset first received quality threshold and a ratio threshold, where the target signal includes a reference signal and a secondary synchronization signal, or the reference signal; and in each second period after the wireless link is determined to be in the out-of-step state, carrying out synchronous judgment on the wireless link according to the received receiving quality of each reference signal and a preset second receiving quality threshold so as to determine whether the terminal is in the out-of-step state of the physical layer. The method can add the receiving quality of the auxiliary synchronous signal as an auxiliary judgment basis on the basis of synchronous and asynchronous judgment of the wireless link according to the receiving quality of the reference signal, thereby improving the accuracy of synchronous and asynchronous judgment of the wireless link.
Fig. 2 is a flow chart of a method for determining out-of-sync for a wireless link shown in fig. 1, where step 101 may include, as shown in fig. 2:
in step 1011, for each of the first periods, a ratio of the first reference signal to all the reference signals received in the first period is determined.
The first reference signal is a reference signal with a reception quality lower than the first reception quality threshold received in the first period.
Illustratively, the ratio is actually a ratio of the number of communication subframes, specifically, the ratio is a ratio of the number of communication subframes carrying the first reference signal to the number of all communication subframes carrying the reference signal received in the present period. The communication subframe carrying the reference signal (or the first reference signal) is a communication subframe containing an NRS, and may be, for example, an NPDBCH (narrow band physical broadcast channel) subframe, an NPDCCH (narrow band physical downlink control channel) subframe, an NPDSCH (narrow band physical downlink shared channel) subframe, or a communication subframe carrying an NRS alone.
In step 1012, the ratio is compared with the ratio threshold to determine whether the wireless link is out of synchronization in the first period according to the comparison result and the reception quality of the secondary synchronization signal.
Illustratively, the ratio threshold includes: if the receiving quality of all NRS communication subframes is lower than the first receiving quality threshold, determining that the wireless link is out of synchronization in the current period; if the number of communication subframes containing the first reference signal is excessive and exceeds the limit (the occupied ratio is larger than a first ratio threshold), determining that the wireless link is out of step in the current period; in another embodiment, if the number of communication subframes containing the first reference signal is larger but does not exceed the limit (the occupied ratio is smaller than the first ratio threshold and larger than the second ratio threshold), the determination of the NSSS reception quality needs to be introduced to further determine whether the wireless link is out-of-synchronization in the current period, so as to improve the accuracy of the out-of-synchronization determination. Specifically, this step 1012 may include: if the ratio is equal to 1, determining that the wireless link is out of synchronization in the first period; or, if the ratio is greater than the first ratio threshold, determining that the wireless link is out of synchronization in the first period; or, if the ratio is smaller than the first ratio threshold and larger than the second ratio threshold, and the reception quality of all secondary synchronization signals received in the first period is lower than the first reception quality threshold, determining that the wireless link is out of synchronization in the first period.
In step 1013, in the case where it is determined that the wireless link is out of synchronization for a first preset number of consecutive first periods, it is determined that the wireless link is in an out-of-synchronization state.
Illustratively, the first predetermined number is an N310 parameter specified in the 3GPP TS 36.133 related standard, and if the wireless link is out of synchronization in N310 consecutive first periods, the wireless link is considered to be in an out-of-synchronization state.
Fig. 3 is a flow chart of a method for deciding synchronization of a wireless link shown in fig. 1, wherein step 102 may include, as shown in fig. 3:
in step 1021, for each second cycle, it is determined whether a second reference signal exists among all reference signals received in the second cycle.
Wherein the second reference signal is a reference signal with a reception quality lower than the second reception quality threshold.
In step 1022, in the case where it is determined that there is no second reference signal among all the reference signals received in the second period, it is determined that the wireless link is in the synchronization state in the second period.
In step 1023, in a case where the wireless link is determined to be in the synchronization state in a second preset number of consecutive second periods, it is determined that the wireless link is restored to the synchronization state.
In step 1024, it is determined that the terminal is in the physical layer out-of-sync state after determining that the radio link is not in the sync state for a second preset number of consecutive second periods.
Exemplarily, in the synchronization decision of step 1021-. And under the condition that the receiving quality of all NRS signals in the second period is greater than the second reference signal, determining that the wireless link is synchronous in the current second period, otherwise, determining that the wireless link is out of step in the current second period. Further, if it is detected that the wireless link is synchronized in N311 (the second preset number) consecutive second periods within the timing duration of T310, it is determined that the wireless link recovers the synchronization state, and a synchronization message is reported to the upper layer. If the terminal does not report the synchronization message within the timing duration of T310, the high layer determines that the terminal is in a long-term out-of-step state (namely, a physical layer out-of-step state) caused by the factors of the physical layer, and further releases the current wireless link. The N311 parameter is also a parameter specified in the 3GPP TS 36.133 related standard, and there is no numerical relationship with the N310 parameter.
Fig. 4 is a flowchart of an out-of-sync decision method for another wireless link shown in fig. 1, and as shown in fig. 4, before step 101, the method may further include:
in step 103, the ratio threshold is determined according to a plurality of preset threshold values, the receiving state of the terminal and the maximum repeated transmission times of the physical downlink control channel subframe in the wireless link.
The threshold values are ratio threshold values determined by performing a simulation test on the invalid link through a preset algorithm.
Illustratively, the receiving state includes: a continuous receiving state and a Discontinuous Receiving (DRX) state, and the physical downlink control channel subframe is an NPDCCH subframe. Since the number of communication subframes received in the continuous reception state and the DRX state is different, the above ratio thresholds employed in the continuous reception state and the DRX state are also different. Based on this, before performing the synchronization and de-synchronization decision on the current wireless link, the actual value of the ratio threshold adopted in the subsequent re-step 101 needs to be determined according to the receiving state of the current terminal and the maximum number of times of repeated transmission of the NPDCCH subframe. Specifically, the empirical values (i.e., the threshold values) obtained by simulation through the preset algorithm under different configuration scenarios include: a first ratio threshold, a second ratio threshold, a third ratio threshold, a fourth ratio threshold, and a number of times threshold, where step 103 may include: taking the fourth ratio threshold value as the second ratio threshold; taking the first ratio threshold value as the second ratio threshold value under the condition that the receiving state of the cell is a continuous receiving state; taking the second ratio threshold as the second ratio threshold under the condition that the receiving state of the cell is a discontinuous receiving state and the maximum repeated sending times is greater than the time threshold; or, in the case that the receiving state of the cell is a discontinuous receiving state and the maximum number of repeated transmissions is less than or equal to the number threshold, the third ratio threshold is used as the second ratio threshold. It should be noted that, no matter the terminal is in the continuous receiving state or the DRX state, the number of NSSS subframes received is small, and therefore, the actual value of the ratio threshold (second ratio threshold) for NSSS participating in the synchronization and de-synchronization determination is the fourth ratio threshold obtained by the simulation test in both receiving states. However, for NRS, the variation range of the number of received signals of the terminal in the continuous reception state and the DRX state is large, and therefore, for the maximum number of times of repeated transmissions in different reception states and NPDCCH subframes, the actual value of the ratio threshold (first ratio threshold) for NRS participating in the synchronization and de-synchronization determination is different.
In summary, in the technical solution provided in the embodiments of the present disclosure, in each first period after a terminal enters a connected state, an out-of-step determination may be performed on a radio link of the terminal according to a received quality of each target signal and a preset first received quality threshold and a ratio threshold, where the target signal includes a reference signal and a secondary synchronization signal, or the reference signal; and in each second period after the wireless link is determined to be in the out-of-step state, carrying out synchronous judgment on the wireless link according to the received receiving quality of each reference signal and a preset second receiving quality threshold so as to determine whether the terminal is in the out-of-step state of the physical layer. The method can add the receiving quality of the auxiliary synchronous signal as an auxiliary judgment basis on the basis of synchronous and asynchronous judgment of the wireless link according to the receiving quality of the reference signal, thereby improving the accuracy of synchronous and asynchronous judgment of the wireless link.
Fig. 5 is a block diagram of an apparatus for detecting out-of-synchronization of a wireless link according to an exemplary embodiment, as shown in fig. 5, applied to a terminal described in the above application scenario, where the apparatus 500 includes:
an out-of-step determining module 510, configured to perform out-of-step determination on a radio link of the terminal according to the received reception quality of each target signal and a preset first reception quality threshold and ratio threshold in each first period after the terminal enters a connected state, where the target signal includes a reference signal and an auxiliary synchronization signal, or the reference signal;
and a synchronization decision module 520 configured to, in each second period after determining that the radio link is in the out-of-synchronization state, perform a synchronization decision on the radio link according to the received quality of each reference signal and a preset second reception quality threshold to determine whether the terminal is in the out-of-synchronization state of the physical layer.
Optionally, the out-of-synchronization determining module 510 is configured to:
for each first period, determining the ratio of a first reference signal to all reference signals received in the first period, wherein the first reference signal is a reference signal with the reception quality lower than the first reception quality threshold and received in the first period;
comparing the ratio with the ratio threshold to determine whether the wireless link is out of synchronization in the first period according to the comparison result and the reception quality of the secondary synchronization signal, wherein the ratio threshold comprises: a first ratio threshold and a second ratio threshold;
and under the condition that the wireless link is determined to be out of step in a first preset number of continuous first periods, determining that the wireless link is in an out-of-step state.
Optionally, the out-of-synchronization determining module 510 is configured to:
if the ratio is equal to 1, determining that the wireless link is out of synchronization in the first period; alternatively, the first and second electrodes may be,
if the ratio is larger than the first ratio threshold, determining that the wireless link is out of synchronization in the first period; alternatively, the first and second electrodes may be,
and if the ratio is smaller than the first ratio threshold and larger than the second ratio threshold and the receiving quality of all the secondary synchronization signals received in the first period is lower than the first receiving quality threshold, determining that the wireless link is out of synchronization in the first period.
Optionally, the synchronization determining module 520 is configured to:
for each second period, determining whether a second reference signal exists in all reference signals received in the second period, wherein the second reference signal is a reference signal with the receiving quality lower than a second receiving quality threshold;
determining that the wireless link is in a synchronization state in the second period, in a case where it is determined that there is no second reference signal among all reference signals received in the second period;
under the condition that the wireless link is determined to be in the synchronous state in a second preset number of continuous second periods, determining that the wireless link recovers the synchronous state; alternatively, the first and second electrodes may be,
and determining that the terminal is in the physical layer out-of-synchronization state after determining that the wireless link is not in the synchronization state in the second preset number of consecutive periods.
Fig. 6 is a block diagram of an apparatus for detecting out-of-sync of a wireless link according to another embodiment shown in fig. 5, and as shown in fig. 6, the apparatus 500 may further include:
a threshold determining module 530, configured to determine the ratio threshold according to a plurality of preset threshold values, the receiving state of the cell where the terminal is located, and the maximum repeated transmission times of the physical downlink control channel subframes in the wireless link, where the plurality of threshold values are ratio threshold values determined by performing a simulation test on the invalid link through a preset algorithm.
Optionally, the receiving state includes: the continuous receiving state and the discontinuous receiving state are based on a plurality of preset thresholds, wherein the plurality of thresholds comprise: a first ratio threshold, a second ratio threshold, a third ratio threshold, a fourth ratio threshold, and a number of times threshold;
the threshold determination module 530 is configured to:
taking the fourth ratio threshold value as the second ratio threshold;
taking the first ratio threshold value as the second ratio threshold value under the condition that the receiving state of the cell is a continuous receiving state;
taking the second ratio threshold as the second ratio threshold under the condition that the receiving state of the cell is a discontinuous receiving state and the maximum repeated sending times is greater than the time threshold; alternatively, the first and second electrodes may be,
and taking the third ratio threshold value as the second ratio threshold under the condition that the receiving state of the cell is a discontinuous receiving state and the maximum repeated sending times is less than or equal to the time threshold value.
In summary, in the technical solution provided in the embodiments of the present disclosure, in each first period after a terminal enters a connected state, an out-of-step determination may be performed on a radio link of the terminal according to a received quality of each target signal and a preset first received quality threshold and a ratio threshold, where the target signal includes a reference signal and a secondary synchronization signal, or the reference signal; and in each second period after the wireless link is determined to be in the out-of-step state, carrying out synchronous judgment on the wireless link according to the received receiving quality of each reference signal and a preset second receiving quality threshold so as to determine whether the terminal is in the out-of-step state of the physical layer. The method can add the receiving quality of the auxiliary synchronous signal as an auxiliary judgment basis on the basis of synchronous and asynchronous judgment of the wireless link according to the receiving quality of the reference signal, thereby improving the accuracy of synchronous and asynchronous judgment of the wireless link.
Fig. 7 is a block diagram illustrating a terminal according to an example embodiment. For example, the terminal 700 may be a personal computer, a notebook computer, a smart phone, a tablet computer, a wearable device, a vehicle with an attached NBIoT network device, an appliance, a household appliance, and the like.
Referring to fig. 7, terminal 700 may include one or more of the following components: a processing component 702, a memory 704, a power component 706, a multimedia component 708, an audio component 710, an input/output (I/O) interface 712, a sensor component 714, and a communication component 716.
The processing component 702 generally controls overall operation of the terminal 700, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 702 may include one or more processors 720 to execute instructions to perform all or a portion of the steps of the out-of-sync detection method for a wireless link described above. Further, the processing component 702 may include one or more modules that facilitate interaction between the processing component 702 and other components. For example, the processing component 702 may include a multimedia module to facilitate interaction between the multimedia component 708 and the processing component 702.
The memory 704 is configured to store various types of data to support operation at the terminal 700. Examples of such data include instructions for any application or method operating on terminal 700, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 704 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The multimedia component 708 includes a screen providing an output interface between the terminal 700 and the target user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a target user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 708 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the terminal 700 is in an operation mode, such as a photographing mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
The audio component 710 is configured to output and/or input audio signals. For example, the audio component 710 includes a Microphone (MIC) configured to receive external audio signals when the terminal 700 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal may further be stored in the memory 704 or transmitted via the communication component 716. In some embodiments, audio component 710 also includes a speaker for outputting audio signals.
The I/O interface 712 provides an interface between the processing component 702 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor assembly 714 includes one or more sensors for providing various aspects of state assessment for the terminal 700. For example, sensor assembly 714 can detect an open/closed state of terminal 700, relative positioning of components, such as a display and keypad of terminal 700, change in position of terminal 700 or a component of terminal 700, presence or absence of contact by an intended user with terminal 700, orientation or acceleration/deceleration of terminal 700, and temperature change of terminal 700. The sensor assembly 714 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 714 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 714 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 716 is configured to facilitate communications between the terminal 700 and other devices in a wired or wireless manner. The terminal 700 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 716 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 716 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the terminal 700 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described method of detecting the loss of synchronization of the wireless link.
In an exemplary embodiment, a non-transitory computer readable storage medium, such as the memory 704 including instructions executable by the processor 720 of the terminal 700 to perform the out-of-sync detection method of a wireless link described above, is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
In another exemplary embodiment, a computer program product is also provided, which comprises a computer program executable by a programmable apparatus, the computer program having code portions for performing the out-of-sync detection method of a wireless link described above when executed by the programmable apparatus.
The terminal provided by the embodiment of the disclosure can add the receiving quality of the auxiliary synchronization signal as an auxiliary judgment basis on the basis of synchronous and asynchronous judgment of the wireless link according to the receiving quality of the reference signal, thereby improving the accuracy of synchronous and asynchronous judgment of the wireless link.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (14)
1. A method for detecting out-of-sync in a wireless link, the method comprising:
in each first period after the terminal enters a connection state, performing out-of-step judgment on a wireless link of the terminal according to the receiving quality of each received target signal, a preset first receiving quality threshold and a ratio threshold, wherein the target signal comprises a reference signal and an auxiliary synchronization signal, or the reference signal;
and in each second period after the wireless link is determined to be in the out-of-step state, carrying out synchronous judgment on the wireless link according to the received receiving quality of each reference signal and a preset second receiving quality threshold so as to determine whether the wireless link is in the out-of-step state of a physical layer.
2. The method of claim 1, wherein the determining, in each first period after the terminal enters the connected state, the out-of-synchronization of the radio link of the terminal according to the received quality of each target signal and a preset first reception quality threshold and a ratio threshold comprises:
for each first period, determining the ratio of a first reference signal to all reference signals received in the first period, wherein the first reference signal is a reference signal whose received quality in the first period is lower than the first received quality threshold;
comparing the ratio with the ratio threshold to determine whether the wireless link is out of synchronization in the first period according to the comparison result and the receiving quality of the secondary synchronization signal, wherein the ratio threshold comprises: a first ratio threshold and a second ratio threshold;
and under the condition that the wireless link is determined to be out of step in a first preset number of continuous first periods, determining that the wireless link is in an out-of-step state.
3. The method of claim 2, wherein comparing the ratio with the ratio threshold to determine whether the wireless link is out of synchronization in the first period according to the comparison result and the reception quality of the secondary synchronization signal comprises:
if the ratio is equal to 1, determining that the wireless link is out of synchronization in the first period; alternatively, the first and second electrodes may be,
if the ratio is larger than the first ratio threshold, determining that the wireless link is out of step in the first period; alternatively, the first and second electrodes may be,
and if the ratio is smaller than the first ratio threshold and larger than the second ratio threshold, and the receiving quality of all the secondary synchronization signals received in the first period is lower than the first receiving quality threshold, determining that the wireless link is out of synchronization in the first period.
4. The method of claim 1, wherein the performing a synchronization decision on the radio link according to the received quality of each reference signal and a preset second reception quality threshold in each second period after determining that the radio link is in the out-of-synchronization state to determine whether the terminal is in the out-of-synchronization state in the physical layer comprises:
determining, for each second period, whether a second reference signal exists in all reference signals received within the second period, where the second reference signal is a reference signal whose reception quality is lower than the second reception quality threshold;
determining that the wireless link is in a synchronization state in the second period, in a case where it is determined that a second reference signal does not exist among all reference signals received in the second period;
under the condition that the wireless link is determined to be in the synchronous state in a second preset number of continuous second periods, determining that the wireless link recovers the synchronous state; alternatively, the first and second electrodes may be,
and determining that the terminal is in a physical layer out-of-synchronization state after determining that the wireless link is not in a synchronization state within the second preset number of consecutive second periods.
5. The method according to claim 2, wherein before the out-of-synchronization decision is made on the radio link of the terminal according to the received quality of each target signal and the preset first receiving quality threshold and ratio threshold, the method further comprises:
and determining the ratio threshold according to a plurality of preset threshold values, the receiving state of the terminal and the maximum repeated transmission times of the physical downlink control channel subframe in the wireless link, wherein the plurality of threshold values are ratio threshold values determined by performing a simulation test on the invalid link through a preset algorithm.
6. The method of claim 5, wherein the receiving state comprises: a continuous reception state and a discontinuous reception state, the plurality of threshold values including: a first ratio threshold, a second ratio threshold, a third ratio threshold, a fourth ratio threshold, and a number of times threshold;
the determining the ratio threshold according to a plurality of preset threshold values, the receiving state of the terminal and the maximum repeated transmission times of the physical downlink control channel subframe in the wireless link includes:
taking the fourth ratio threshold value as the second ratio threshold;
taking the first ratio threshold value as the second ratio threshold value under the condition that the receiving state of the cell is a continuous receiving state;
taking the second ratio threshold as the second ratio threshold under the condition that the receiving state of the cell is a discontinuous receiving state and the maximum repeated sending times is greater than the time threshold; alternatively, the first and second electrodes may be,
and taking the third ratio threshold value as the second ratio threshold under the condition that the receiving state of the cell is a discontinuous receiving state and the maximum repeated sending times is less than or equal to the time threshold value.
7. An apparatus for detecting loss of synchronization of a wireless link, the apparatus comprising:
the out-of-step judgment module is configured to perform out-of-step judgment on a wireless link of the terminal according to the receiving quality of each received target signal and a preset first receiving quality threshold and a ratio threshold in each first period after the terminal enters a connection state, wherein the target signal comprises a reference signal and an auxiliary synchronization signal, or the reference signal;
and the synchronization judging module is configured to perform synchronization judgment on the wireless link according to the received receiving quality of each reference signal and a preset second receiving quality threshold in each second period after the wireless link is determined to be in the out-of-synchronization state so as to determine whether the terminal is in the out-of-synchronization state of the physical layer.
8. The apparatus of claim 7, wherein the out-of-sync decision module is configured to:
for each first period, determining the ratio of a first reference signal to all reference signals received in the first period, wherein the first reference signal is a reference signal whose received quality in the first period is lower than the first received quality threshold;
comparing the ratio with the ratio threshold to determine whether the wireless link is out of synchronization in the first period according to the comparison result and the receiving quality of the secondary synchronization signal, wherein the ratio threshold comprises: a first ratio threshold and a second ratio threshold;
and under the condition that the wireless link is determined to be out of step in a first preset number of continuous first periods, determining that the wireless link is in an out-of-step state.
9. The apparatus of claim 8, wherein the out-of-sync decision module is configured to:
if the ratio is equal to 1, determining that the wireless link is out of synchronization in the first period; alternatively, the first and second electrodes may be,
if the ratio is larger than the first ratio threshold, determining that the wireless link is out of step in the first period; alternatively, the first and second electrodes may be,
and if the ratio is smaller than the first ratio threshold and larger than the second ratio threshold, and the receiving quality of all the secondary synchronization signals received in the first period is lower than the first receiving quality threshold, determining that the wireless link is out of synchronization in the first period.
10. The apparatus of claim 7, wherein the synchronization decision module is configured to:
determining, for each second period, whether a second reference signal exists in all reference signals received within the second period, where the second reference signal is a reference signal whose reception quality is lower than the second reception quality threshold;
determining that the wireless link is in a synchronization state in the second period, in a case where it is determined that a second reference signal does not exist among all reference signals received in the second period;
under the condition that the wireless link is determined to be in the synchronous state in a second preset number of continuous second periods, determining that the wireless link recovers the synchronous state; alternatively, the first and second electrodes may be,
and determining that the terminal is in a physical layer out-of-synchronization state after determining that the wireless link is not in a synchronization state within the second preset number of consecutive second periods.
11. The apparatus of claim 8, further comprising:
a threshold determining module configured to determine the ratio threshold according to a plurality of preset threshold values, a receiving state of a cell where the terminal is located, and a maximum number of repeated transmission times of a physical downlink control channel subframe in the wireless link, where the plurality of threshold values are ratio threshold values determined by performing a simulation test on the invalid link through a preset algorithm.
12. The apparatus of claim 11, wherein the receiving state comprises: a continuous reception state and a discontinuous reception state, the plurality of threshold values including: a first ratio threshold, a second ratio threshold, a third ratio threshold, a fourth ratio threshold, and a number of times threshold;
the threshold determination module configured to:
taking the fourth ratio threshold value as the second ratio threshold;
taking the first ratio threshold value as the second ratio threshold value under the condition that the receiving state of the cell is a continuous receiving state;
taking the second ratio threshold as the second ratio threshold under the condition that the receiving state of the cell is a discontinuous receiving state and the maximum repeated sending times is greater than the time threshold; alternatively, the first and second electrodes may be,
and taking the third ratio threshold value as the second ratio threshold under the condition that the receiving state of the cell is a discontinuous receiving state and the maximum repeated sending times is less than or equal to the time threshold value.
13. A computer-readable storage medium, on which computer program instructions are stored, which program instructions, when executed by a processor, carry out the steps of the method according to any one of claims 1 to 6.
14. A terminal, comprising: out-of-sync detection apparatus for a wireless link as claimed in any of claims 7 to 12.
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