CN117979398A

CN117979398A - Wake-up signal detection method and device, communication equipment and storage medium

Info

Publication number: CN117979398A
Application number: CN202410167575.6A
Authority: CN
Inventors: 杨殷; 熊堃; 黄新平; 赵细云; 方冬梅
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2024-02-05
Filing date: 2024-02-05
Publication date: 2024-05-03

Abstract

The application discloses a wake-up signal detection method and device, communication equipment and storage medium, wherein the method comprises the following steps: receiving downlink signals from sub-frames and performing cross-correlation calculation, wherein the sub-frames comprise periodic signal sub-frames and wake-up signal NWUS sub-frames, and the periodic signals comprise one or two of synchronous signals and broadcast signals; accumulating different subframes, antennas and sequences respectively for the cross-correlation result of the periodic signal subframes and the cross-correlation result of NWUS subframes; determining NWUS a detection threshold according to the cross-correlation result of the accumulated periodic signal subframes; and NWUS detection is carried out according to the accumulated result of the cross correlation of NWUS subframes and the NWUS detection threshold. By utilizing the scheme of the application, the wake-up signal can be rapidly judged, and further, the timing information can be output through the peak position of the cross-correlation result of the periodic signal and the wake-up signal according to the presence or absence of the wake-up signal, so that the power consumption of the equipment is reduced.

Description

Wake-up signal detection method and device, communication equipment and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a wake-up signal detection method and apparatus, a communication device, and a storage medium.

Background

In the third generation partnership project (3rd Generation Partnership Project,3GPP) narrowband internet of things (Narrow Band Internet of Things, NB-IoT) standard 15 (Release 15, R15) protocol, in order to further save power for a User Equipment (UE) in an IDLE (IDLE) state, a paging time Window (PAGING TIME Window, PTW) is reduced, and reception of a page (paging) is activated with a Wake Up Signal (WUS). And the terminal only opens downlink reception at paging occasion (paging timing) when judging that the wake-up signal exists, otherwise skips the paging reception to achieve the purpose of saving electricity. Because the amount of information carried by the wake-up signal is less, the wake-up signal is judged to be more power-saving than paging, and the probability of the base station sending the paging is not high in reality, and the UE can only detect the wake-up signal and skip paging reception most of the time, so that the power consumption of the UE end in an idle state can be saved by introducing the wake-up signal.

The conventional method for detecting the wake-up signal is to receive all valid wake-up signal subframes, then obtain a correlation peak through cross-correlation calculation, determine whether the correlation peak exceeds a decision threshold value to be the wake-up signal, and then determine whether to activate subsequent paging occasion reception. In general, the setting of the threshold may be determined based on a correlation value distribution of random additive white gaussian noise and a local sequence. For example, when the correlation value of white noise is less than the threshold value C _Th by X% after accumulating N _sf subframes, the false detection probability is (100-X)%, i.e. when the correlation value of the received signal is greater than C _Th but no wake-up signal is present, the probability is less than (100-X)%. Setting the threshold by white noise correlation value distribution is prone to the following problems: when the threshold value is set too high, the missed detection rate is increased, and the paging of the base station is missed; when the threshold is set too low, the false detection rate is increased and paging reception is frequently performed, so that the power consumption is additionally increased. The threshold value can also be determined according to the signal-to-noise ratio before sleeping, when the signal-to-noise ratio is larger, the threshold value is larger, and otherwise, the threshold value is smaller. However, determining the threshold according to the pre-sleep signal-to-noise ratio tends to cause the following problems: when the sleep time is long, the signal-to-noise ratio can change, so that the threshold value determined by the signal-to-noise ratio before sleep becomes inaccurate, and the actual signal-to-noise ratio of the current paging cycle cannot be reflected.

In particular, if there is a large time offset in the wake-up signal, it is also necessary to use the local wake-up signal sequence to perform a sliding correlation with the received time domain signal, and then determine correlation peaks of all the time offsets. In addition, if there is no wake-up signal for a plurality of consecutive paging cycles, the time offset of the UE may exceed the detection range of the UE due to the continuous accumulation, and the UE must resume synchronization by detecting the synchronization signal, which also requires additional power consumption.

Disclosure of Invention

The embodiment of the application provides a wake-up signal detection method and device, communication equipment and storage medium, which can rapidly detect the wake-up signal and reduce the power consumption of the equipment.

In one aspect, an embodiment of the present application provides a wake-up signal detection method, where the method includes:

Receiving downlink signals from sub-frames and performing cross-correlation calculation, wherein the sub-frames comprise periodic signal sub-frames and wake-up signal NWUS sub-frames, and the periodic signals comprise one or two of synchronous signals and broadcast signals;

accumulating different subframes, antennas and sequences respectively for the cross-correlation result of the periodic signal subframe and the cross-correlation result of the NWUS subframe;

determining NWUS a detection threshold according to the cross-correlation result of the accumulated periodic signal subframes;

And NWUS detection is carried out according to the accumulated result of the cross correlation of NWUS subframes and the NWUS detection threshold.

Optionally, the receiving the downlink signal on a subframe-by-subframe basis includes: the NWUS subframe is received beginning at a start frame of NWUS.

Optionally, the receiving the downlink signal by sub-frame further includes: beginning to receive the periodic signal subframe before a start frame of NWUS; or the periodic signal subframe is received beginning at a start frame of NWUS.

Optionally, the periodic signal subframe includes any one or more of: narrowband physical broadcast channel NPBCH subframes, narrowband primary synchronization signal NPSS subframes, narrowband secondary synchronization signal NSSS subframes.

Optionally, the beginning to receive the periodic signal subframe before the start frame of NWUS includes:

if the starting frame of NWUS is the 1 st subframe of the odd frame, starting to receive at least one subframe of NPBCH subframes and NSSS subframes in the 9 th subframe of the previous frame;

If the starting frame of NWUS is the 1 st subframe of the even frame, starting to receive NPBCH subframes at the 0 th subframe;

If the starting frame NWUS is the 6 th subframe, the NPSS subframe is received at the 5 th subframe.

Optionally, the method further comprises: calculating the signal to noise ratio before sleeping;

the starting of receiving the NPSS subframe at the 5 th subframe includes: and if the signal-to-noise ratio before sleeping is greater than or equal to a set threshold, starting to receive the NPSS subframe in the 5 th subframe.

Optionally, the determining NWUS the detection threshold according to the cross-correlation result of the accumulated periodic signal subframes includes:

Determining the maximum correlation value of the periodic signal sub-frames according to the accumulated cross-correlation result of the periodic signal sub-frames;

and determining NWUS a detection threshold according to the maximum correlation value of the periodic signal subframe.

Optionally, the determining NWUS a detection threshold according to the maximum correlation value of the periodic signal subframe includes: the larger the maximum correlation value of the periodic signal subframe is, the larger the NWUS detection threshold is.

Optionally, the determining NWUS a detection threshold according to the maximum correlation value of the periodic signal subframe includes: and determining NWUS a detection threshold according to the cross-correlation peak value of the periodic signal subframe, the number of receiving antennas, the number of NWUS subframes and the number of subframes of the cross-correlation result of the periodic signal subframe.

Optionally, the performing NWUS detection according to the accumulated cross-correlation result of NWUS subframes and the NWUS detection threshold includes:

Determining a maximum correlation value of NWUS subframes according to the cross-correlation result of the NWUS subframes;

If the maximum correlation value of NWUS subframes is greater than the NWUS detection threshold, determining NWUS is present; otherwise, the decision is NWUS not present.

Optionally, the method further comprises:

if NWUS is present, the time domain position of the cross-correlation peak of NWUS is utilized And/or the time domain position/>, of the cross-correlation peak of the periodic signalRecovering time synchronization from the weighted average position of (a);

If NWUS is not present, the time domain position of the cross-correlation peak of the periodic signal is utilized And restoring time synchronization.

In another aspect, an embodiment of the present application further provides a wake-up signal detection apparatus, where the apparatus includes:

the receiving module is used for receiving downlink signals from subframe to subframe, wherein the subframes comprise periodic signal subframes and wake-up signal NWUS subframes, and the periodic signals comprise one or two of synchronous signals and broadcast signals;

The calculating module is used for carrying out cross-correlation calculation on the downlink signals received by the receiving module;

The accumulating module is used for accumulating different subframes and antennas respectively for the cross-correlation result of the periodic signal subframes and the cross-correlation result of the NWUS subframes;

the threshold determining module is used for determining NWUS a detection threshold according to the cross-correlation result of the accumulated periodic signal subframes;

and the detection module is used for carrying out NWUS detection according to the accumulated cross-correlation result of NWUS subframes and the NWUS detection threshold.

Optionally, the apparatus further comprises: a synchronization module for utilizing the time domain position of the cross correlation peak of NWUS when NWUS is presentAnd the time domain position/>, of the cross-correlation peak of the periodic signalRecovering time synchronization from the weighted average position of (a); in the absence NWUS, the time domain position/>, of the cross-correlation peak of the periodic signal is utilizedAnd restoring time synchronization.

On the other hand, the embodiment of the application also provides communication equipment, which comprises the wake-up signal detection device.

In another aspect, embodiments of the present application further provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the wake-up signal detection method described above.

In another aspect, an embodiment of the present application further provides a communication device, including a memory and a processor, where the memory stores a computer program that can be run on the processor, and the processor executes the steps of the wake-up signal detection method described above when running the computer program.

According to the wake-up signal detection method and device, the cross-correlation calculation is carried out on the periodic signal sub-frames and the NWUS sub-frames, and the channel power or the correlation peak is estimated through the periodic signal cross-correlation calculation, so that the corresponding channel is determined, further, threshold reference can be provided for NWUS detection, the threshold setting is more reasonable, the WUS detection efficiency is effectively improved, the wake-up signal can be rapidly judged, and the power consumption of equipment is reduced.

The proposal of the application can further restore the synchronization in each period. Because of the possible rarefaction of paging, the base station may not page the UE for a long period of time, so NWUS may not transmit for a long period of time. In the case NWUS does not transmit, the UE may directly resume synchronization using the detection result of the periodic signal obtained at the same time when it detects NWUS does not exist, without re-detecting the narrowband primary synchronization signal (Narrowband Primary Synchronization Signal, NPSS)/narrowband secondary synchronization signal (Narrowband Secondary Synchronization Signal, NSSS)/narrowband physical broadcast channel (Narrowband Physical Broadcast Channel, NPBCH) as in the conventional method.

Drawings

FIG. 1 is a schematic diagram of REs in subframes and NWUS subframes in the 3GPP NB-IOT R15 protocol;

FIG. 2 is a flowchart of a wake-up signal detection method according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a reception start time of each subframe according to an embodiment of the present application;

FIG. 4 is another flowchart of a wake-up signal detection method according to an embodiment of the present application;

Fig. 5 is a schematic structural diagram of a wake-up signal detecting device according to an embodiment of the present application;

Fig. 6 is a schematic diagram of another structure of a wake-up signal detecting device according to an embodiment of the present application;

Fig. 7 is a schematic hardware structure of a communication device according to an embodiment of the present application.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.

In the 3GPP NB-IOT R15 protocol, as shown in fig. 1, the Resource Elements (REs) in each subframe and the narrowband wakeup signal (Narrowband Wake up Signal, NWUS) subframe are transmitted by interleaving subframes, wherein the wakeup signal, the primary synchronization signal NPSS, the secondary synchronization signal NSSS, and the physical broadcast channel NPBCH signal are transmitted by PBCH in subframe 0, PSS in subframe 5, SSS in subframe 9 of even frame, and NWUS is transmitted continuously in available downlink subframes other than PSS/SSS/PBCH, and different types of subframes are interleaved. In addition, in NWUS subframes, REs for Narrowband REFERENCE SIGNAL (NRS)/Cell reference signal (Cell-SPECIFIC REFERENCE SIGNAL, CRS) are not occupied by NWUS, but are used to transmit NRS and CRS signals.

NWUS the conventional detection method is to receive all valid NWUS subframes and then perform cross-correlation calculation, if NWUS has a larger time offset, then the local NWUS sequence and the received time domain signal need to be used for sliding correlation, and then the correlation peak of all the time offsets is obtained.

The correlation calculation of the received signal and the local signal can be expressed as the following formula:

Or normalized correlation calculation:

And accumulating different subframes and antennas of the cross-correlation result, namely:

Or alternatively

Wherein, the parameters in the above formulas have the following meanings:

r _nr,sf (n) is a received time domain signal, n is a time sequence number;

l is the length of the local sequence;

is the conjugate of the local NWUS time domain sequence; loc is the sequence number of the local sequence (e.g., R16 support of NB-IOT requires simultaneous support of reception of 2 different NWUS sequences);

N _nr is the total number of receive antennas, nr=0, 1, …, N _nr -1 is the antenna number;

For total NWUS subframes,/> For NWUS subframe number.

Finding the maximum correlation value, namely:

if the correct time cannot be determined, a sliding mode is needed, and the method is calculated as follows:

Or alternatively

Where r _nr,sf (d+n) is the received time domain signal with a start time d.

By combining the maximum correlation valueAnd comparing with a preset threshold C _Th to judge whether NWUS exists. Wherein C _Th can be expressed as/>, depending on the number of antennas and the number of subframesIn particular, this threshold represents the accumulation of N _nr antennas and/>The confidence interval of the subframe can be directly checked or determined according to the peak-to-average ratio.

Further, if NWUS is determined to be present, the time-domain position of the cross-correlation peak of NWUS can be usedAnd restoring time synchronization.

In low SNR situations, the cross correlation peak or normalized cross correlation peak may be low, so the UE can only use a small threshold (called a threshold without channel a priori conditions) in order not to miss pages without knowing the channel condition. While a small threshold will lead to a higher false detection rate. The high false detection rate brings frequent PDCCH detection, and further brings extra power consumption. In addition, if there is no NWUS for a plurality of consecutive paging cycles, the time offset of the UE may exceed the detection range of the UE due to the continuous accumulation, and at this time, the UE must resume synchronization by detecting the synchronization signal, which also requires additional power consumption.

In addition, considering that the subframe of the periodic signal (such as NPSS/NSSS/NPBCH) has the characteristics of stable power, periodic transmission and the like, the method is suitable for estimating the power or correlation peak of the carrier. Therefore, the embodiment of the invention provides a wake-up signal detection method, and simultaneously carries out periodic signal cross-correlation calculation and NWUS cross-correlation calculation, wherein the periodic signal cross-correlation can estimate channel power or correlation peak so as to determine a corresponding channel, and threshold reference can be provided for NWUS detection. For example, the channel power is strong or the correlation peak is high according to the cross-correlation result of the periodic signal subframe, at this time, the correlation peak of NWUS should be expected to be as high, and the threshold value of NWUS correlation can be adjusted upwards, so that the decision result can be made faster or the false detection rate can be reduced when NWUS is not available. If the channel power is weak or the correlation peak is low from the cross correlation result of the periodic signal sub-frames, it may be desirable that the correlation peak of NWUS should be equally low, and the NWUS correlation threshold may be adjusted down so that the probability of missed detection may be reduced when NWUS is present.

In addition, without NWUS, the cross-correlation result of the periodic signal can be used directly for timing recovery. For example, synchronization may be resumed every cycle. Because of the sparseness of paging, the base station may not page the UE for a long period of time, so NWUS may not transmit for a long period of time. Moreover, in the case that NWUS does not transmit, when the UE detects that NWUS does not exist, synchronization can be directly restored through the obtained correlation result of the periodic signal, without re-detecting the periodic signal as in the conventional method.

Fig. 2 is a flowchart of a wake-up signal detection method according to an embodiment of the present application, including the following steps:

In step 201, a downlink signal is received and a cross-correlation calculation is performed on a subframe-by-subframe basis, where the subframe includes a periodic signal subframe and a wake-up signal NWUS subframe, and the periodic signal includes one or both of a synchronization signal and a broadcast signal.

In the embodiment of the present application, the periodic signal subframe includes any one or more of the following: NPBCH subframes, NPSS subframes, NSSS subframes. That is, the cross-correlation calculation may be performed on at least one of NPBCH subframes, or NPSS subframes, or NSSS subframes.

If subframe sf is one of NPBCH/NPSS/NSSS, a cross-correlation calculation is performed on it, such as a sliding normalized cross-correlation calculation, i.e.:

wherein:

r _nr,sf (d+n) is the received time domain signal with the starting time d;

The conjugate of NPBCH/NPSS/NSSS time domain signal reconstructed for the UE (depending on the type of subframe sf).

Specifically, for NPSS/NSSS, there is only one local sequence; NSSS sequences also depend on the lower 3 bits of the frame number; for NPBCH, when the base station is configured with N _tx transmit ports, where N _tx =1 or 2, there are N _tx transmit sequences, i.e. loc=0, …, N _tx -1 in the formula, and the ue needs to recode and modulate according to the information of the master information block (Master Information Block, MIB) to recover the NPBCH signal.

It should be noted that the method for performing cross-correlation calculation on NPBCH/NPSS/NSSS subframes and NWUS subframes is merely illustrative, and other cross-correlation calculation methods may be used in specific applications, which is not limited to the embodiment of the present application.

In a specific application, a cross-correlator may be used to perform cross-correlation calculations on subframes of different types. For different types of subframes, the same shift cross correlator can be reused, and only different reconstructed local time domain conjugate signals are needed to be input in different subframes.

In addition, according to the protocol, the starting subframe of NWUS is a downlink subframe of a certain aperiodic signal subframe of a certain time before the paging occasion (the time advance is notified to the UE through signaling configuration). In order to further reduce power consumption and enable quick detection NWUS, according to the start frame number and start subframe number where the start position NWUS is located, the reception and cross-correlation calculation of each subframe may be started in the following manner.

For NWUS subframes, the NWUS subframes may be received beginning at the start frame of NWUS and the cross-correlation calculated. For the above-described periodic signal subframes, the cross-correlation calculation may be started at the beginning frame of NWUS or started immediately before the beginning frame of NWUS.

Referring to fig. 3, fig. 3 is a schematic diagram of a reception start time of each subframe in the embodiment of the present application, where there are the following cases:

(1) The start frame at NWUS begins to receive NWUS subframes and periodic signal subframes and performs cross-correlation calculations, as shown in fig. 3 (a).

(2) If the start frame/subframe NWUS is the 1 st subframe of the odd frame, the 9 th subframe of the previous frame starts to receive at least one subframe of NPBCH subframes and NSSS subframes, as shown in (b) of fig. 3.

(3) If the start frame/subframe NWUS is the 1 st subframe of the even frame, reception NPBCH subframes starts at the 0 th subframe of the frame, as shown in fig. 3 (c).

(4) If the starting subframe of NWUS is the 6 th subframe, the NPSS subframe is received starting at the 5 th subframe. Specifically, calculating the current signal-to-noise ratio; if the current signal-to-noise ratio is greater than or equal to the set threshold, starting to receive the NPSS subframe at the 5 th subframe, as shown in (d) of fig. 3; otherwise, receive NWUS subframes at the 6 th subframe, as shown in fig. 3 (e).

The NPSS/NSSS/NPBCH before NWUS start frame starts corresponding periodic signal sub-frame to receive and perform cross-correlation calculation, and the periodic signal sub-frame can be utilized to estimate channel power and signal to noise ratio in advance, so that channel power and quality can be obtained before NWUS sub-frame is received, a more reasonable threshold can be obtained when NWUS sub-frames are received, and the detection efficiency and detection capability of NWUS are greatly improved. Meanwhile, if NWUS does not exist, the cross-correlation result of the periodic signal can also directly provide a time offset result output without waiting for the decision NWUS to exist and then restarting the synchronization recovery based on the periodic signal.

Step 202, accumulating different subframes and antennas for the cross-correlation result of the periodic signal subframe and the cross-correlation result of the NWUS subframe respectively.

The accumulation refers to addition, including addition between subframes, antennas or sequences, and the accumulation result is expressed by acc in the following formula.

The cross correlation results of NWUS and non-NWUS (i.e., NPSS/NSSS/NPBCH) are accumulated for different subframes, antennas, and sequences, respectively, according to the type of the current subframe, namely:

In particular, two separate accumulation buffers (buffers) may be maintained to store the accumulation results, one of which records Another register record/>

Step 203, determining NWUS a detection threshold according to the cross-correlation result of the accumulated synchronization signal subframes.

First, the maximum correlation value of the periodic signal sub-frame, i.e. the cross correlation peak value, is determined according to the cross correlation result of the accumulated periodic signal sub-framesAt the same time, the time domain position of the cross-correlation peak value can be determinedSpecifically, the method can be expressed as follows:

Then, a NWUS detection threshold is determined from the cross-correlation peak of the periodic signal subframe. In general, the larger the cross-correlation peak of a periodic signal subframe, the larger NWUS detection threshold C _Th.

In one non-limiting embodiment, NWUS detection threshold C _Th may depend on the cross-correlation peak of the periodic signal subframeThe number of receiving antennas N _nr, NWUS subframe number/>Subframe number/>, with periodic signal subframe cross-correlation results

For example, the NWUS detection threshold C _Th may be determined according to, but not limited to, the following formula:

Wherein, Representing the desired strength of cross-correlation of NWUS,/>Representing confidence intervals for which NWUS deviate in the expected cross-correlation strength due to the presence of noise. For example, in the case where the different signals are equal in energy per RE:

Wherein, Is the effective RE number of NWUS frequency domain signal in the subframe,/>The effective RE number of the frequency domain signal which is the periodic signal in the subframe, and/>Can be obtained by looking up a pre-set table.

Preset formMay be obtained by simulation or calculation. In general terms, the process is carried out,The normalized correlation value of the random Gaussian white noise in the signal space is represented, and the distribution of the normalized correlation value is close to the gamma distribution. It has the following law, when/>The larger indicates a greater number of accumulations,/>The larger the/>The smaller.

And 204, performing NWUS detection according to the accumulated result of the cross correlation of NWUS subframes and the NWUS detection threshold.

Specifically, the maximum correlation value, i.e., the cross-correlation peak value, of NWUS subframes is determined according to the accumulated NWUS subframes cross-correlation resultAnd the corresponding time domain position/>, of the maximum correlation valueAnd sequence/>Specifically, the method can be expressed as follows:

if NWUS sub-frames cross correlation peak Greater than the NWUS detection threshold C _Th, then a decision is made that NWUS is present; otherwise, the decision is NWUS not present.

According to the wake-up signal detection method provided by the embodiment of the application, the periodic signal cross-correlation calculation and NWUS cross-correlation calculation are performed simultaneously, and the periodic signal cross-correlation result is utilized to provide a threshold reference for NWUS detection, so that the detection threshold of NWUS can be dynamically adjusted according to the actual condition of a channel, the setting of the detection threshold is better adapted to the current channel condition, the NWUS detection efficiency is improved, and the false detection rate and the omission rate are reduced.

Further, in another non-limiting embodiment of the wake-up signal detection method of the present application, timing recovery may also be performed according to the correlation result of the periodic signal.

Fig. 4 is another flowchart of a wake-up signal detection method according to an embodiment of the present application.

In step 401, the downlink signal is received and the cross-correlation calculation is performed on a subframe-by-subframe basis, where the subframes include a periodic signal subframe and a wake-up signal NWUS subframe.

Step 402, accumulating different subframes and antennas for the cross-correlation result of the periodic signal subframe and the cross-correlation result of the NWUS subframe respectively.

Step 403, determining NWUS a detection threshold according to the cross-correlation result of the accumulated periodic signal sub-frames.

And step 404, performing NWUS detection according to the accumulated result of the cross correlation of NWUS subframes and the NWUS detection threshold.

The steps 401 to 404 are the same as the steps 201 to 204 in fig. 2, and will not be described in detail here.

And step 405, recovering time synchronization according to the detection result.

In particular, if NWUS is present, the time domain position of the cross-correlation peak of NWUS may be utilizedRestoring time synchronization, or using the time domain position/>, of the cross-correlation peak of NWUSAnd/or the time domain position/>, of the cross-correlation peak of the periodic signalRestoring time synchronization; if NWUS is not present, the time domain position/>, of the cross-correlation peak of the periodic signal is utilizedAnd restoring time synchronization.

That is, when the decision is NWUS is not present, the time domain position of the cross-correlation peak of the periodic signal is directly usedRestoring time synchronization and turning off the receiver, skipping paging to directly go to sleep, and waiting for the next paging cycle. When the decision is NWUS present, it can be combined/>And/or/>Restoring time synchronization and preparing to receive pages.

By the way, use is made ofAnd/>When the combination is performed to restore time synchronization, the combination mode of the two may be simple average, or the effective RE number may be weighted average, or other combination modes, which is not limited in this embodiment of the present application.

Alternatively, when the decision is NWUS present, the comparison can be madeAndFurther accumulating and searching peaks, namely:

Wherein, Representation pair/>And/>Cumulative result obtained by performing the accumulation,/>Representing the peak value of both accumulations,/>Representing the time domain position of the peak.

Accordingly, it can pass throughAnd restoring time synchronization.

By using the scheme of the embodiment of the application, the synchronization can be restored in each period, and when the UE detects that NWUS does not exist under the condition that NWUS does not transmit, the synchronization can be directly restored through the detection result of the periodic signals obtained simultaneously, and the synchronization is restored without re-detecting the periodic signals like the traditional method, thereby improving the synchronization efficiency.

Correspondingly, the embodiment of the application also provides a wake-up signal detection device, as shown in fig. 5, which is a schematic structural diagram of the device.

Referring to fig. 5, the wake-up signal detecting apparatus 500 includes the following modules:

a receiving module 501, configured to receive a downlink signal from a subframe to subframe, where the subframe includes a periodic signal subframe and a wake-up signal NWUS subframe, and the periodic signal includes one or two of a synchronization signal and a broadcast signal;

A calculating module 502, configured to perform cross-correlation calculation on the downlink signal received by the receiving module;

An accumulating module 503, configured to accumulate different subframes and antennas for the cross-correlation result of the periodic signal subframe and the cross-correlation result of the NWUS subframe, respectively;

A threshold determining module 504, configured to determine NWUS a detection threshold according to the cross-correlation result of the accumulated periodic signal subframes;

A detection module 505, configured to perform NWUS detection according to the accumulated result of the cross-correlation of NWUS subframes and the NWUS detection threshold.

As shown in fig. 6, in another non-limiting embodiment of the wake-up signal detecting apparatus according to the present application, the wake-up signal detecting apparatus 500 may further include:

A synchronization module 601 for utilizing the time domain position of the cross correlation peak of NWUS when NWUS is present And the time domain position/>, of the cross-correlation peak of the periodic signalRestoring time synchronization; in the absence NWUS, the time domain position/>, of the cross-correlation peak of the periodic signal is utilizedAnd restoring time synchronization.

For other descriptions of the wake-up signal detection apparatus 500, reference may be made to the descriptions of the corresponding embodiments of the wake-up signal detection method according to the present application, which are not repeated here.

Correspondingly, the embodiment of the application also provides a communication device, which comprises the wake-up signal detection device 500 in the embodiment shown in fig. 5 or fig. 6.

The wake-up signal detection method and device and the communication equipment provided by the embodiment of the application can be applied to products of 5G NR terminal chips, terminal chip modules and the like based on the 3GPP NBIOT R15 protocol and corresponding protocol versions, or terminals or modules of protocols (such as LTE/NR) with synchronous signals SSB and WUS similar wake-up mechanism signals.

In a specific implementation, the above-mentioned apparatus may correspond to a Chip of a corresponding function in the network device and/or the user device, such as an SOC (System-On-a-Chip), a baseband Chip, a Chip module, etc.

In a specific implementation, regarding each apparatus and each module/unit included in each product described in the above embodiments, it may be a software module/unit, or a hardware module/unit, or may be a software module/unit partially, or a hardware module/unit partially. For example, for each device or product applied to or integrated on a chip, each module/unit included in the device or product may be implemented in hardware such as a circuit, or at least some modules/units may be implemented in software program, where the software program runs on a processor integrated inside the chip, and the remaining (if any) part of modules/units may be implemented in hardware such as a circuit; for each device and product applied to or integrated in the chip module, each module/unit contained in the device and product can be realized in a hardware manner such as a circuit, different modules/units can be located in the same component (such as a chip, a circuit module and the like) or different components of the chip module, or at least part of the modules/units can be realized in a software program, the software program runs on a processor integrated in the chip module, and the rest (if any) of the modules/units can be realized in a hardware manner such as a circuit; for each device, product, or application to or integrated with the terminal, each module/unit included in the device, product, or application may be implemented in hardware such as a circuit, where different modules/units may be located in the same component (e.g., a chip, a circuit module, etc.) or different components in the terminal, or at least some modules/units may be implemented in a software program, where the software program runs on a processor integrated within the terminal, and the remaining (if any) some modules/units may be implemented in hardware such as a circuit.

The embodiment of the application also discloses a storage medium, which is a computer readable storage medium, and a computer program is stored on the storage medium, and when the computer program runs, part or all of the steps of the method shown in fig. 2 or fig. 4 can be executed. The storage medium may include Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic or optical disks, and the like. The storage medium may also include non-volatile memory (non-volatile) or non-transitory memory (non-transitory) or the like.

Referring to fig. 7, the embodiment of the application further provides a hardware structure schematic diagram of the communication device. The communication device comprises a processor 701, a memory 702 and a transceiver 703.

The processor 701 may be a general purpose central processing unit (central processing unit, CPU), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the programs of the present application. The processor 701 may also include multiple CPUs, and the processor 701 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

The memory 702 may be a ROM or other type of static storage device, a RAM or other type of dynamic storage device that can store static information and instructions, or that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, as embodiments of the application are not limited in this regard. The memory 502 may exist alone (in which case the memory 502 may be located outside or within the device) or may be integrated with the processor 701. Wherein the memory 702 may contain computer program code. The processor 701 is configured to execute computer program code stored in the memory 702, thereby implementing the method provided by the embodiment of the present application.

The processor 701, the memory 702 and the transceiver 703 are connected by a bus. The transceiver 703 is used to communicate with other devices or communication networks. Alternatively, the transceiver 703 may include a transmitter and a receiver. The means in the transceiver 703 for implementing the receiving function may be regarded as a receiver for performing the steps of receiving in an embodiment of the application. The means in the transceiver 703 for implementing the transmitting function may be regarded as a transmitter for performing the steps in an embodiment of the method of the application.

While the schematic structural diagram shown in fig. 7 is used to illustrate the structure of the communication device according to the above embodiment, the processor 701 is configured to control and manage the actions of the communication device, for example, the processor 701 is configured to support the communication device to perform all or part of the steps in fig. 2 or fig. 4, and/or the actions performed by the communication device in other processes described in the embodiments of the present application. The processor 701 may communicate with other network entities, such as with the network devices described above, via the transceiver 703. The memory 702 is used to store program codes and data for the communication device.

It should be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In this context, the character "/" indicates that the front and rear associated objects are an "or" relationship.

The term "plurality" as used in the embodiments of the present application means two or more.

The first, second, etc. descriptions in the embodiments of the present application are only used for illustrating and distinguishing the description objects, and no order is used, nor is the number of the devices in the embodiments of the present application limited, and no limitation on the embodiments of the present application should be construed.

The "connection" in the embodiment of the present application refers to various connection manners such as direct connection or indirect connection, so as to implement communication between devices, which is not limited in the embodiment of the present application.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired or wireless means.

In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus and system may be implemented in other manners. For example, the device embodiments described above are merely illustrative; for example, the division of the units is only one logic function division, and other division modes can be adopted in actual implementation; for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may be physically disposed separately, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.

The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform part of the steps of the method according to the embodiments of the present application.

Although the present application is disclosed above, the present application is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the application, and the scope of the application should be assessed accordingly to that of the appended claims.

Claims

1. A wake-up signal detection method, the method comprising:

2. The method of claim 1, wherein receiving the downlink signal on a subframe-by-subframe basis comprises:

The NWUS subframe is received beginning at a start frame of NWUS.

3. The method of claim 2, wherein receiving the downlink signal on a subframe-by-subframe basis further comprises:

Beginning to receive the periodic signal subframe before a start frame of NWUS; or alternatively

The periodic signal subframe is received beginning at a start frame of NWUS.

4. A method according to claim 3, wherein the periodic signal sub-frames comprise any one or more of: narrowband physical broadcast channel NPBCH subframes, narrowband primary synchronization signal NPSS subframes, narrowband secondary synchronization signal NSSS subframes.

5. The method of claim 4, wherein the beginning of receiving the periodic signal subframe prior to a start frame of NWUS comprises:

6. The method of claim 5, wherein the method further comprises: calculating the signal to noise ratio before sleeping;

The starting of receiving the NPSS subframe at the 5 th subframe includes:

and if the signal-to-noise ratio before sleeping is greater than or equal to a set threshold, starting to receive the NPSS subframe in the 5 th subframe.

7. The method of claim 1, wherein the determining NWUS a detection threshold from the cross-correlation result of the accumulated periodic signal subframes comprises:

8. The method of claim 7, wherein said determining NWUS a detection threshold from a maximum correlation value for the periodic signal subframe comprises: the larger the maximum correlation value of the periodic signal subframe is, the larger the NWUS detection threshold is.

9. The method of claim 7, wherein said determining NWUS a detection threshold from a maximum correlation value for the periodic signal subframe comprises:

and determining NWUS a detection threshold according to the cross-correlation peak value of the periodic signal subframe, the number of receiving antennas, the number of NWUS subframes and the number of subframes of the cross-correlation result of the periodic signal subframe.

10. The method of claim 1, wherein the NWUS detecting based on the accumulated NWUS subframes cross-correlation results and the NWUS detection threshold comprises:

11. The method according to any one of claims 1 to 10, further comprising:

if NWUS is present, recovering time synchronization using the time domain position of the cross-correlation peak of NWUS and/or the weighted average position of the time domain position of the cross-correlation peak of the periodic signal;

If NWUS is not present, time synchronization is restored using the time domain position of the cross-correlation peak of the periodic signal.

12. A wake-up signal detection apparatus, the apparatus comprising:

13. The apparatus of claim 12, wherein the apparatus further comprises:

A synchronization module for restoring time synchronization using the weighted average position of the time domain position of the cross correlation peak of NWUS and the time domain position of the cross correlation peak of the periodic signal when NWUS is present; in the absence NWUS, the time synchronization is restored using the time domain position of the cross-correlation peak of the periodic signal.

14. A communication device, characterized in that it comprises wake-up signal detection means as claimed in claim 12 or 13.

15. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, performs the steps of the wake-up signal detection method of any one of claims 1 to 11.

16. A communication device comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, the processor executing the steps of the wake-up signal detection method of any of claims 1 to 11 when the computer program is executed.